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-rw-r--r--mesalib/src/mesa/shader/slang/slang_codegen.c5354
1 files changed, 0 insertions, 5354 deletions
diff --git a/mesalib/src/mesa/shader/slang/slang_codegen.c b/mesalib/src/mesa/shader/slang/slang_codegen.c
deleted file mode 100644
index 7d5e5eb29..000000000
--- a/mesalib/src/mesa/shader/slang/slang_codegen.c
+++ /dev/null
@@ -1,5354 +0,0 @@
-/*
- * Mesa 3-D graphics library
- *
- * Copyright (C) 2005-2007 Brian Paul All Rights Reserved.
- * Copyright (C) 2008 VMware, Inc. All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-/**
- * \file slang_codegen.c
- * Generate IR tree from AST.
- * \author Brian Paul
- */
-
-
-/***
- *** NOTES:
- *** The new_() functions return a new instance of a simple IR node.
- *** The gen_() functions generate larger IR trees from the simple nodes.
- ***/
-
-
-
-#include "main/imports.h"
-#include "main/macros.h"
-#include "main/mtypes.h"
-#include "shader/program.h"
-#include "shader/prog_instruction.h"
-#include "shader/prog_parameter.h"
-#include "shader/prog_print.h"
-#include "shader/prog_statevars.h"
-#include "slang_typeinfo.h"
-#include "slang_builtin.h"
-#include "slang_codegen.h"
-#include "slang_compile.h"
-#include "slang_label.h"
-#include "slang_mem.h"
-#include "slang_simplify.h"
-#include "slang_emit.h"
-#include "slang_vartable.h"
-#include "slang_ir.h"
-#include "slang_print.h"
-
-
-/** Max iterations to unroll */
-const GLuint MAX_FOR_LOOP_UNROLL_ITERATIONS = 32;
-
-/** Max for-loop body size (in slang operations) to unroll */
-const GLuint MAX_FOR_LOOP_UNROLL_BODY_SIZE = 50;
-
-/** Max for-loop body complexity to unroll.
- * We'll compute complexity as the product of the number of iterations
- * and the size of the body. So long-ish loops with very simple bodies
- * can be unrolled, as well as short loops with larger bodies.
- */
-const GLuint MAX_FOR_LOOP_UNROLL_COMPLEXITY = 256;
-
-
-
-static slang_ir_node *
-_slang_gen_operation(slang_assemble_ctx * A, slang_operation *oper);
-
-static void
-slang_substitute(slang_assemble_ctx *A, slang_operation *oper,
- GLuint substCount, slang_variable **substOld,
- slang_operation **substNew, GLboolean isLHS);
-
-
-/**
- * Retrieves type information about an operation.
- * Returns GL_TRUE on success.
- * Returns GL_FALSE otherwise.
- */
-static GLboolean
-typeof_operation(const struct slang_assemble_ctx_ *A,
- slang_operation *op,
- slang_typeinfo *ti)
-{
- return _slang_typeof_operation(op, &A->space, ti, A->atoms, A->log);
-}
-
-
-static GLboolean
-is_sampler_type(const slang_fully_specified_type *t)
-{
- switch (t->specifier.type) {
- case SLANG_SPEC_SAMPLER_1D:
- case SLANG_SPEC_SAMPLER_2D:
- case SLANG_SPEC_SAMPLER_3D:
- case SLANG_SPEC_SAMPLER_CUBE:
- case SLANG_SPEC_SAMPLER_1D_SHADOW:
- case SLANG_SPEC_SAMPLER_2D_SHADOW:
- case SLANG_SPEC_SAMPLER_RECT:
- case SLANG_SPEC_SAMPLER_RECT_SHADOW:
- case SLANG_SPEC_SAMPLER_1D_ARRAY:
- case SLANG_SPEC_SAMPLER_2D_ARRAY:
- case SLANG_SPEC_SAMPLER_1D_ARRAY_SHADOW:
- case SLANG_SPEC_SAMPLER_2D_ARRAY_SHADOW:
- return GL_TRUE;
- default:
- return GL_FALSE;
- }
-}
-
-
-/**
- * Return the offset (in floats or ints) of the named field within
- * the given struct. Return -1 if field not found.
- * If field is NULL, return the size of the struct instead.
- */
-static GLint
-_slang_field_offset(const slang_type_specifier *spec, slang_atom field)
-{
- GLint offset = 0;
- GLuint i;
- for (i = 0; i < spec->_struct->fields->num_variables; i++) {
- const slang_variable *v = spec->_struct->fields->variables[i];
- const GLuint sz = _slang_sizeof_type_specifier(&v->type.specifier);
- if (sz > 1) {
- /* types larger than 1 float are register (4-float) aligned */
- offset = (offset + 3) & ~3;
- }
- if (field && v->a_name == field) {
- return offset;
- }
- offset += sz;
- }
- if (field)
- return -1; /* field not found */
- else
- return offset; /* struct size */
-}
-
-
-/**
- * Return the size (in floats) of the given type specifier.
- * If the size is greater than 4, the size should be a multiple of 4
- * so that the correct number of 4-float registers are allocated.
- * For example, a mat3x2 is size 12 because we want to store the
- * 3 columns in 3 float[4] registers.
- */
-GLuint
-_slang_sizeof_type_specifier(const slang_type_specifier *spec)
-{
- GLuint sz;
- switch (spec->type) {
- case SLANG_SPEC_VOID:
- sz = 0;
- break;
- case SLANG_SPEC_BOOL:
- sz = 1;
- break;
- case SLANG_SPEC_BVEC2:
- sz = 2;
- break;
- case SLANG_SPEC_BVEC3:
- sz = 3;
- break;
- case SLANG_SPEC_BVEC4:
- sz = 4;
- break;
- case SLANG_SPEC_INT:
- sz = 1;
- break;
- case SLANG_SPEC_IVEC2:
- sz = 2;
- break;
- case SLANG_SPEC_IVEC3:
- sz = 3;
- break;
- case SLANG_SPEC_IVEC4:
- sz = 4;
- break;
- case SLANG_SPEC_FLOAT:
- sz = 1;
- break;
- case SLANG_SPEC_VEC2:
- sz = 2;
- break;
- case SLANG_SPEC_VEC3:
- sz = 3;
- break;
- case SLANG_SPEC_VEC4:
- sz = 4;
- break;
- case SLANG_SPEC_MAT2:
- sz = 2 * 4; /* 2 columns (regs) */
- break;
- case SLANG_SPEC_MAT3:
- sz = 3 * 4;
- break;
- case SLANG_SPEC_MAT4:
- sz = 4 * 4;
- break;
- case SLANG_SPEC_MAT23:
- sz = 2 * 4; /* 2 columns (regs) */
- break;
- case SLANG_SPEC_MAT32:
- sz = 3 * 4; /* 3 columns (regs) */
- break;
- case SLANG_SPEC_MAT24:
- sz = 2 * 4;
- break;
- case SLANG_SPEC_MAT42:
- sz = 4 * 4; /* 4 columns (regs) */
- break;
- case SLANG_SPEC_MAT34:
- sz = 3 * 4;
- break;
- case SLANG_SPEC_MAT43:
- sz = 4 * 4; /* 4 columns (regs) */
- break;
- case SLANG_SPEC_SAMPLER_1D:
- case SLANG_SPEC_SAMPLER_2D:
- case SLANG_SPEC_SAMPLER_3D:
- case SLANG_SPEC_SAMPLER_CUBE:
- case SLANG_SPEC_SAMPLER_1D_SHADOW:
- case SLANG_SPEC_SAMPLER_2D_SHADOW:
- case SLANG_SPEC_SAMPLER_RECT:
- case SLANG_SPEC_SAMPLER_RECT_SHADOW:
- case SLANG_SPEC_SAMPLER_1D_ARRAY:
- case SLANG_SPEC_SAMPLER_2D_ARRAY:
- case SLANG_SPEC_SAMPLER_1D_ARRAY_SHADOW:
- case SLANG_SPEC_SAMPLER_2D_ARRAY_SHADOW:
- sz = 1; /* a sampler is basically just an integer index */
- break;
- case SLANG_SPEC_STRUCT:
- sz = _slang_field_offset(spec, 0); /* special use */
- if (sz == 1) {
- /* 1-float structs are actually troublesome to deal with since they
- * might get placed at R.x, R.y, R.z or R.z. Return size=2 to
- * ensure the object is placed at R.x
- */
- sz = 2;
- }
- else if (sz > 4) {
- sz = (sz + 3) & ~0x3; /* round up to multiple of four */
- }
- break;
- case SLANG_SPEC_ARRAY:
- sz = _slang_sizeof_type_specifier(spec->_array);
- break;
- default:
- _mesa_problem(NULL, "Unexpected type in _slang_sizeof_type_specifier()");
- sz = 0;
- }
-
- if (sz > 4) {
- /* if size is > 4, it should be a multiple of four */
- assert((sz & 0x3) == 0);
- }
- return sz;
-}
-
-
-/**
- * Query variable/array length (number of elements).
- * This is slightly non-trivial because there are two ways to express
- * arrays: "float x[3]" vs. "float[3] x".
- * \return the length of the array for the given variable, or 0 if not an array
- */
-static GLint
-_slang_array_length(const slang_variable *var)
-{
- if (var->type.array_len > 0) {
- /* Ex: float[4] x; */
- return var->type.array_len;
- }
- if (var->array_len > 0) {
- /* Ex: float x[4]; */
- return var->array_len;
- }
- return 0;
-}
-
-
-/**
- * Compute total size of array give size of element, number of elements.
- * \return size in floats
- */
-static GLint
-_slang_array_size(GLint elemSize, GLint arrayLen)
-{
- GLint total;
- assert(elemSize > 0);
- if (arrayLen > 1) {
- /* round up base type to multiple of 4 */
- total = ((elemSize + 3) & ~0x3) * MAX2(arrayLen, 1);
- }
- else {
- total = elemSize;
- }
- return total;
-}
-
-
-/**
- * Return the TEXTURE_*_INDEX value that corresponds to a sampler type,
- * or -1 if the type is not a sampler.
- */
-static GLint
-sampler_to_texture_index(const slang_type_specifier_type type)
-{
- switch (type) {
- case SLANG_SPEC_SAMPLER_1D:
- return TEXTURE_1D_INDEX;
- case SLANG_SPEC_SAMPLER_2D:
- return TEXTURE_2D_INDEX;
- case SLANG_SPEC_SAMPLER_3D:
- return TEXTURE_3D_INDEX;
- case SLANG_SPEC_SAMPLER_CUBE:
- return TEXTURE_CUBE_INDEX;
- case SLANG_SPEC_SAMPLER_1D_SHADOW:
- return TEXTURE_1D_INDEX; /* XXX fix */
- case SLANG_SPEC_SAMPLER_2D_SHADOW:
- return TEXTURE_2D_INDEX; /* XXX fix */
- case SLANG_SPEC_SAMPLER_RECT:
- return TEXTURE_RECT_INDEX;
- case SLANG_SPEC_SAMPLER_RECT_SHADOW:
- return TEXTURE_RECT_INDEX; /* XXX fix */
- case SLANG_SPEC_SAMPLER_1D_ARRAY:
- return TEXTURE_1D_ARRAY_INDEX;
- case SLANG_SPEC_SAMPLER_2D_ARRAY:
- return TEXTURE_2D_ARRAY_INDEX;
- case SLANG_SPEC_SAMPLER_1D_ARRAY_SHADOW:
- return TEXTURE_1D_ARRAY_INDEX;
- case SLANG_SPEC_SAMPLER_2D_ARRAY_SHADOW:
- return TEXTURE_2D_ARRAY_INDEX;
- default:
- return -1;
- }
-}
-
-
-/** helper to build a SLANG_OPER_IDENTIFIER node */
-static void
-slang_operation_identifier(slang_operation *oper,
- slang_assemble_ctx *A,
- const char *name)
-{
- oper->type = SLANG_OPER_IDENTIFIER;
- oper->a_id = slang_atom_pool_atom(A->atoms, name);
-}
-
-
-/**
- * Called when we begin code/IR generation for a new while/do/for loop.
- */
-static void
-push_loop(slang_assemble_ctx *A, slang_operation *loopOper, slang_ir_node *loopIR)
-{
- A->LoopOperStack[A->LoopDepth] = loopOper;
- A->LoopIRStack[A->LoopDepth] = loopIR;
- A->LoopDepth++;
-}
-
-
-/**
- * Called when we end code/IR generation for a new while/do/for loop.
- */
-static void
-pop_loop(slang_assemble_ctx *A)
-{
- assert(A->LoopDepth > 0);
- A->LoopDepth--;
-}
-
-
-/**
- * Return pointer to slang_operation for the loop we're currently inside,
- * or NULL if not in a loop.
- */
-static const slang_operation *
-current_loop_oper(const slang_assemble_ctx *A)
-{
- if (A->LoopDepth > 0)
- return A->LoopOperStack[A->LoopDepth - 1];
- else
- return NULL;
-}
-
-
-/**
- * Return pointer to slang_ir_node for the loop we're currently inside,
- * or NULL if not in a loop.
- */
-static slang_ir_node *
-current_loop_ir(const slang_assemble_ctx *A)
-{
- if (A->LoopDepth > 0)
- return A->LoopIRStack[A->LoopDepth - 1];
- else
- return NULL;
-}
-
-
-/**********************************************************************/
-
-
-/**
- * Map "_asm foo" to IR_FOO, etc.
- */
-typedef struct
-{
- const char *Name;
- slang_ir_opcode Opcode;
- GLuint HaveRetValue, NumParams;
-} slang_asm_info;
-
-
-static slang_asm_info AsmInfo[] = {
- /* vec4 binary op */
- { "vec4_add", IR_ADD, 1, 2 },
- { "vec4_subtract", IR_SUB, 1, 2 },
- { "vec4_multiply", IR_MUL, 1, 2 },
- { "vec4_dot", IR_DOT4, 1, 2 },
- { "vec3_dot", IR_DOT3, 1, 2 },
- { "vec2_dot", IR_DOT2, 1, 2 },
- { "vec3_nrm", IR_NRM3, 1, 1 },
- { "vec4_nrm", IR_NRM4, 1, 1 },
- { "vec3_cross", IR_CROSS, 1, 2 },
- { "vec4_lrp", IR_LRP, 1, 3 },
- { "vec4_min", IR_MIN, 1, 2 },
- { "vec4_max", IR_MAX, 1, 2 },
- { "vec4_cmp", IR_CMP, 1, 3 },
- { "vec4_clamp", IR_CLAMP, 1, 3 },
- { "vec4_seq", IR_SEQUAL, 1, 2 },
- { "vec4_sne", IR_SNEQUAL, 1, 2 },
- { "vec4_sge", IR_SGE, 1, 2 },
- { "vec4_sgt", IR_SGT, 1, 2 },
- { "vec4_sle", IR_SLE, 1, 2 },
- { "vec4_slt", IR_SLT, 1, 2 },
- /* vec4 unary */
- { "vec4_move", IR_MOVE, 1, 1 },
- { "vec4_floor", IR_FLOOR, 1, 1 },
- { "vec4_frac", IR_FRAC, 1, 1 },
- { "vec4_abs", IR_ABS, 1, 1 },
- { "vec4_negate", IR_NEG, 1, 1 },
- { "vec4_ddx", IR_DDX, 1, 1 },
- { "vec4_ddy", IR_DDY, 1, 1 },
- /* float binary op */
- { "float_power", IR_POW, 1, 2 },
- /* texture / sampler */
- { "vec4_tex_1d", IR_TEX, 1, 2 },
- { "vec4_tex_1d_bias", IR_TEXB, 1, 2 }, /* 1d w/ bias */
- { "vec4_tex_1d_proj", IR_TEXP, 1, 2 }, /* 1d w/ projection */
- { "vec4_tex_2d", IR_TEX, 1, 2 },
- { "vec4_tex_2d_bias", IR_TEXB, 1, 2 }, /* 2d w/ bias */
- { "vec4_tex_2d_proj", IR_TEXP, 1, 2 }, /* 2d w/ projection */
- { "vec4_tex_3d", IR_TEX, 1, 2 },
- { "vec4_tex_3d_bias", IR_TEXB, 1, 2 }, /* 3d w/ bias */
- { "vec4_tex_3d_proj", IR_TEXP, 1, 2 }, /* 3d w/ projection */
- { "vec4_tex_cube", IR_TEX, 1, 2 }, /* cubemap */
- { "vec4_tex_rect", IR_TEX, 1, 2 }, /* rectangle */
- { "vec4_tex_rect_bias", IR_TEX, 1, 2 }, /* rectangle w/ projection */
- { "vec4_tex_1d_array", IR_TEX, 1, 2 },
- { "vec4_tex_1d_array_bias", IR_TEXB, 1, 2 },
- { "vec4_tex_1d_array_shadow", IR_TEX, 1, 2 },
- { "vec4_tex_1d_array_bias_shadow", IR_TEXB, 1, 2 },
- { "vec4_tex_2d_array", IR_TEX, 1, 2 },
- { "vec4_tex_2d_array_bias", IR_TEXB, 1, 2 },
- { "vec4_tex_2d_array_shadow", IR_TEX, 1, 2 },
- { "vec4_tex_2d_array_bias_shadow", IR_TEXB, 1, 2 },
-
- /* texture / sampler but with shadow comparison */
- { "vec4_tex_1d_shadow", IR_TEX_SH, 1, 2 },
- { "vec4_tex_1d_bias_shadow", IR_TEXB_SH, 1, 2 },
- { "vec4_tex_1d_proj_shadow", IR_TEXP_SH, 1, 2 },
- { "vec4_tex_2d_shadow", IR_TEX_SH, 1, 2 },
- { "vec4_tex_2d_bias_shadow", IR_TEXB_SH, 1, 2 },
- { "vec4_tex_2d_proj_shadow", IR_TEXP_SH, 1, 2 },
- { "vec4_tex_rect_shadow", IR_TEX_SH, 1, 2 },
- { "vec4_tex_rect_proj_shadow", IR_TEXP_SH, 1, 2 },
-
- /* unary op */
- { "ivec4_to_vec4", IR_I_TO_F, 1, 1 }, /* int[4] to float[4] */
- { "vec4_to_ivec4", IR_F_TO_I, 1, 1 }, /* float[4] to int[4] */
- { "float_exp", IR_EXP, 1, 1 },
- { "float_exp2", IR_EXP2, 1, 1 },
- { "float_log2", IR_LOG2, 1, 1 },
- { "float_rsq", IR_RSQ, 1, 1 },
- { "float_rcp", IR_RCP, 1, 1 },
- { "float_sine", IR_SIN, 1, 1 },
- { "float_cosine", IR_COS, 1, 1 },
- { "float_noise1", IR_NOISE1, 1, 1},
- { "float_noise2", IR_NOISE2, 1, 1},
- { "float_noise3", IR_NOISE3, 1, 1},
- { "float_noise4", IR_NOISE4, 1, 1},
-
- { NULL, IR_NOP, 0, 0 }
-};
-
-
-static slang_ir_node *
-new_node3(slang_ir_opcode op,
- slang_ir_node *c0, slang_ir_node *c1, slang_ir_node *c2)
-{
- slang_ir_node *n = (slang_ir_node *) _slang_alloc(sizeof(slang_ir_node));
- if (n) {
- n->Opcode = op;
- n->Children[0] = c0;
- n->Children[1] = c1;
- n->Children[2] = c2;
- n->InstLocation = -1;
- }
- return n;
-}
-
-static slang_ir_node *
-new_node2(slang_ir_opcode op, slang_ir_node *c0, slang_ir_node *c1)
-{
- return new_node3(op, c0, c1, NULL);
-}
-
-static slang_ir_node *
-new_node1(slang_ir_opcode op, slang_ir_node *c0)
-{
- return new_node3(op, c0, NULL, NULL);
-}
-
-static slang_ir_node *
-new_node0(slang_ir_opcode op)
-{
- return new_node3(op, NULL, NULL, NULL);
-}
-
-
-/**
- * Create sequence of two nodes.
- */
-static slang_ir_node *
-new_seq(slang_ir_node *left, slang_ir_node *right)
-{
- if (!left)
- return right;
- if (!right)
- return left;
- return new_node2(IR_SEQ, left, right);
-}
-
-static slang_ir_node *
-new_label(slang_label *label)
-{
- slang_ir_node *n = new_node0(IR_LABEL);
- assert(label);
- if (n)
- n->Label = label;
- return n;
-}
-
-static slang_ir_node *
-new_float_literal(const float v[4], GLuint size)
-{
- slang_ir_node *n = new_node0(IR_FLOAT);
- assert(size <= 4);
- COPY_4V(n->Value, v);
- /* allocate a storage object, but compute actual location (Index) later */
- n->Store = _slang_new_ir_storage(PROGRAM_CONSTANT, -1, size);
- return n;
-}
-
-
-static slang_ir_node *
-new_not(slang_ir_node *n)
-{
- return new_node1(IR_NOT, n);
-}
-
-
-/**
- * Non-inlined function call.
- */
-static slang_ir_node *
-new_function_call(slang_ir_node *code, slang_label *name)
-{
- slang_ir_node *n = new_node1(IR_CALL, code);
- assert(name);
- if (n)
- n->Label = name;
- return n;
-}
-
-
-/**
- * Unconditional jump.
- */
-static slang_ir_node *
-new_return(slang_label *dest)
-{
- slang_ir_node *n = new_node0(IR_RETURN);
- assert(dest);
- if (n)
- n->Label = dest;
- return n;
-}
-
-
-static slang_ir_node *
-new_loop(slang_ir_node *body)
-{
- return new_node1(IR_LOOP, body);
-}
-
-
-static slang_ir_node *
-new_break(slang_ir_node *loopNode)
-{
- slang_ir_node *n = new_node0(IR_BREAK);
- assert(loopNode);
- assert(loopNode->Opcode == IR_LOOP);
- if (n) {
- /* insert this node at head of linked list of cont/break instructions */
- n->List = loopNode->List;
- loopNode->List = n;
- }
- return n;
-}
-
-
-/**
- * Make new IR_BREAK_IF_TRUE.
- */
-static slang_ir_node *
-new_break_if_true(slang_assemble_ctx *A, slang_ir_node *cond)
-{
- slang_ir_node *loopNode = current_loop_ir(A);
- slang_ir_node *n;
- assert(loopNode);
- assert(loopNode->Opcode == IR_LOOP);
- n = new_node1(IR_BREAK_IF_TRUE, cond);
- if (n) {
- /* insert this node at head of linked list of cont/break instructions */
- n->List = loopNode->List;
- loopNode->List = n;
- }
- return n;
-}
-
-
-/**
- * Make new IR_CONT_IF_TRUE node.
- */
-static slang_ir_node *
-new_cont_if_true(slang_assemble_ctx *A, slang_ir_node *cond)
-{
- slang_ir_node *loopNode = current_loop_ir(A);
- slang_ir_node *n;
- assert(loopNode);
- assert(loopNode->Opcode == IR_LOOP);
- n = new_node1(IR_CONT_IF_TRUE, cond);
- if (n) {
- n->Parent = loopNode; /* pointer to containing loop */
- /* insert this node at head of linked list of cont/break instructions */
- n->List = loopNode->List;
- loopNode->List = n;
- }
- return n;
-}
-
-
-static slang_ir_node *
-new_cond(slang_ir_node *n)
-{
- slang_ir_node *c = new_node1(IR_COND, n);
- return c;
-}
-
-
-static slang_ir_node *
-new_if(slang_ir_node *cond, slang_ir_node *ifPart, slang_ir_node *elsePart)
-{
- return new_node3(IR_IF, cond, ifPart, elsePart);
-}
-
-
-/**
- * New IR_VAR node - a reference to a previously declared variable.
- */
-static slang_ir_node *
-new_var(slang_assemble_ctx *A, slang_variable *var)
-{
- slang_ir_node *n = new_node0(IR_VAR);
- if (n) {
- ASSERT(var);
- ASSERT(var->store);
- ASSERT(!n->Store);
- ASSERT(!n->Var);
-
- /* Set IR node's Var and Store pointers */
- n->Var = var;
- n->Store = var->store;
- }
- return n;
-}
-
-
-/**
- * Check if the given function is really just a wrapper for a
- * basic assembly instruction.
- */
-static GLboolean
-slang_is_asm_function(const slang_function *fun)
-{
- if (fun->body->type == SLANG_OPER_BLOCK_NO_NEW_SCOPE &&
- fun->body->num_children == 1 &&
- fun->body->children[0].type == SLANG_OPER_ASM) {
- return GL_TRUE;
- }
- return GL_FALSE;
-}
-
-
-static GLboolean
-_slang_is_noop(const slang_operation *oper)
-{
- if (!oper ||
- oper->type == SLANG_OPER_VOID ||
- (oper->num_children == 1 && oper->children[0].type == SLANG_OPER_VOID))
- return GL_TRUE;
- else
- return GL_FALSE;
-}
-
-
-/**
- * Recursively search tree for a node of the given type.
- */
-#if 0
-static slang_operation *
-_slang_find_node_type(slang_operation *oper, slang_operation_type type)
-{
- GLuint i;
- if (oper->type == type)
- return oper;
- for (i = 0; i < oper->num_children; i++) {
- slang_operation *p = _slang_find_node_type(&oper->children[i], type);
- if (p)
- return p;
- }
- return NULL;
-}
-#endif
-
-
-/**
- * Count the number of operations of the given time rooted at 'oper'.
- */
-static GLuint
-_slang_count_node_type(const slang_operation *oper, slang_operation_type type)
-{
- GLuint i, count = 0;
- if (oper->type == type) {
- return 1;
- }
- for (i = 0; i < oper->num_children; i++) {
- count += _slang_count_node_type(&oper->children[i], type);
- }
- return count;
-}
-
-
-/**
- * Check if the 'return' statement found under 'oper' is a "tail return"
- * that can be no-op'd. For example:
- *
- * void func(void)
- * {
- * .. do something ..
- * return; // this is a no-op
- * }
- *
- * This is used when determining if a function can be inlined. If the
- * 'return' is not the last statement, we can't inline the function since
- * we still need the semantic behaviour of the 'return' but we don't want
- * to accidentally return from the _calling_ function. We'd need to use an
- * unconditional branch, but we don't have such a GPU instruction (not
- * always, at least).
- */
-static GLboolean
-_slang_is_tail_return(const slang_operation *oper)
-{
- GLuint k = oper->num_children;
-
- while (k > 0) {
- const slang_operation *last = &oper->children[k - 1];
- if (last->type == SLANG_OPER_RETURN)
- return GL_TRUE;
- else if (last->type == SLANG_OPER_IDENTIFIER ||
- last->type == SLANG_OPER_LABEL)
- k--; /* try prev child */
- else if (last->type == SLANG_OPER_BLOCK_NO_NEW_SCOPE ||
- last->type == SLANG_OPER_BLOCK_NEW_SCOPE)
- /* try sub-children */
- return _slang_is_tail_return(last);
- else
- break;
- }
-
- return GL_FALSE;
-}
-
-
-/**
- * Generate a variable declaration opeartion.
- * I.e.: generate AST code for "bool flag = false;"
- */
-static void
-slang_generate_declaration(slang_assemble_ctx *A,
- slang_variable_scope *scope,
- slang_operation *decl,
- slang_type_specifier_type type,
- const char *name,
- GLint initValue)
-{
- slang_variable *var;
-
- assert(type == SLANG_SPEC_BOOL ||
- type == SLANG_SPEC_INT);
-
- decl->type = SLANG_OPER_VARIABLE_DECL;
-
- var = slang_variable_scope_grow(scope);
-
- slang_fully_specified_type_construct(&var->type);
-
- var->type.specifier.type = type;
- var->a_name = slang_atom_pool_atom(A->atoms, name);
- decl->a_id = var->a_name;
- var->initializer = slang_operation_new(1);
- slang_operation_literal_bool(var->initializer, initValue);
-}
-
-
-static void
-slang_resolve_variable(slang_operation *oper)
-{
- if (oper->type == SLANG_OPER_IDENTIFIER && !oper->var) {
- oper->var = _slang_variable_locate(oper->locals, oper->a_id, GL_TRUE);
- }
-}
-
-
-/**
- * Rewrite AST code for "return expression;".
- *
- * We return values from functions by assinging the returned value to
- * the hidden __retVal variable which is an extra 'out' parameter we add
- * to the function signature.
- * This code basically converts "return expr;" into "__retVal = expr; return;"
- *
- * \return the new AST code.
- */
-static slang_operation *
-gen_return_with_expression(slang_assemble_ctx *A, slang_operation *oper)
-{
- slang_operation *blockOper, *assignOper;
-
- assert(oper->type == SLANG_OPER_RETURN);
-
- if (A->CurFunction->header.type.specifier.type == SLANG_SPEC_VOID) {
- slang_info_log_error(A->log, "illegal return expression");
- return NULL;
- }
-
- blockOper = slang_operation_new(1);
- blockOper->type = SLANG_OPER_BLOCK_NO_NEW_SCOPE;
- blockOper->locals->outer_scope = oper->locals->outer_scope;
- slang_operation_add_children(blockOper, 2);
-
- if (A->UseReturnFlag) {
- /* Emit:
- * {
- * if (__notRetFlag)
- * __retVal = expr;
- * __notRetFlag = 0;
- * }
- */
- {
- slang_operation *ifOper = slang_oper_child(blockOper, 0);
- ifOper->type = SLANG_OPER_IF;
- slang_operation_add_children(ifOper, 3);
- {
- slang_operation *cond = slang_oper_child(ifOper, 0);
- cond->type = SLANG_OPER_IDENTIFIER;
- cond->a_id = slang_atom_pool_atom(A->atoms, "__notRetFlag");
- }
- {
- slang_operation *elseOper = slang_oper_child(ifOper, 2);
- elseOper->type = SLANG_OPER_VOID;
- }
- assignOper = slang_oper_child(ifOper, 1);
- }
- {
- slang_operation *setOper = slang_oper_child(blockOper, 1);
- setOper->type = SLANG_OPER_ASSIGN;
- slang_operation_add_children(setOper, 2);
- {
- slang_operation *lhs = slang_oper_child(setOper, 0);
- lhs->type = SLANG_OPER_IDENTIFIER;
- lhs->a_id = slang_atom_pool_atom(A->atoms, "__notRetFlag");
- }
- {
- slang_operation *rhs = slang_oper_child(setOper, 1);
- slang_operation_literal_bool(rhs, GL_FALSE);
- }
- }
- }
- else {
- /* Emit:
- * {
- * __retVal = expr;
- * return_inlined;
- * }
- */
- assignOper = slang_oper_child(blockOper, 0);
- {
- slang_operation *returnOper = slang_oper_child(blockOper, 1);
- returnOper->type = SLANG_OPER_RETURN_INLINED;
- assert(returnOper->num_children == 0);
- }
- }
-
- /* __retVal = expression; */
- assignOper->type = SLANG_OPER_ASSIGN;
- slang_operation_add_children(assignOper, 2);
- {
- slang_operation *lhs = slang_oper_child(assignOper, 0);
- lhs->type = SLANG_OPER_IDENTIFIER;
- lhs->a_id = slang_atom_pool_atom(A->atoms, "__retVal");
- }
- {
- slang_operation *rhs = slang_oper_child(assignOper, 1);
- slang_operation_copy(rhs, &oper->children[0]);
- }
-
- /*blockOper->locals->outer_scope = oper->locals->outer_scope;*/
-
- /*slang_print_tree(blockOper, 0);*/
-
- return blockOper;
-}
-
-
-/**
- * Rewrite AST code for "return;" (no expression).
- */
-static slang_operation *
-gen_return_without_expression(slang_assemble_ctx *A, slang_operation *oper)
-{
- slang_operation *newRet;
-
- assert(oper->type == SLANG_OPER_RETURN);
-
- if (A->CurFunction->header.type.specifier.type != SLANG_SPEC_VOID) {
- slang_info_log_error(A->log, "return statement requires an expression");
- return NULL;
- }
-
- if (A->UseReturnFlag) {
- /* Emit:
- * __notRetFlag = 0;
- */
- {
- newRet = slang_operation_new(1);
- newRet->locals->outer_scope = oper->locals->outer_scope;
- newRet->type = SLANG_OPER_ASSIGN;
- slang_operation_add_children(newRet, 2);
- {
- slang_operation *lhs = slang_oper_child(newRet, 0);
- lhs->type = SLANG_OPER_IDENTIFIER;
- lhs->a_id = slang_atom_pool_atom(A->atoms, "__notRetFlag");
- }
- {
- slang_operation *rhs = slang_oper_child(newRet, 1);
- slang_operation_literal_bool(rhs, GL_FALSE);
- }
- }
- }
- else {
- /* Emit:
- * return_inlined;
- */
- newRet = slang_operation_new(1);
- newRet->locals->outer_scope = oper->locals->outer_scope;
- newRet->type = SLANG_OPER_RETURN_INLINED;
- }
-
- /*slang_print_tree(newRet, 0);*/
-
- return newRet;
-}
-
-
-
-
-/**
- * Replace particular variables (SLANG_OPER_IDENTIFIER) with new expressions.
- */
-static void
-slang_substitute(slang_assemble_ctx *A, slang_operation *oper,
- GLuint substCount, slang_variable **substOld,
- slang_operation **substNew, GLboolean isLHS)
-{
- switch (oper->type) {
- case SLANG_OPER_VARIABLE_DECL:
- {
- slang_variable *v = _slang_variable_locate(oper->locals,
- oper->a_id, GL_TRUE);
- assert(v);
- if (v->initializer && oper->num_children == 0) {
- /* set child of oper to copy of initializer */
- oper->num_children = 1;
- oper->children = slang_operation_new(1);
- slang_operation_copy(&oper->children[0], v->initializer);
- }
- if (oper->num_children == 1) {
- /* the initializer */
- slang_substitute(A, &oper->children[0], substCount,
- substOld, substNew, GL_FALSE);
- }
- }
- break;
- case SLANG_OPER_IDENTIFIER:
- assert(oper->num_children == 0);
- if (1/**!isLHS XXX FIX */) {
- slang_atom id = oper->a_id;
- slang_variable *v;
- GLuint i;
- v = _slang_variable_locate(oper->locals, id, GL_TRUE);
- if (!v) {
- if (strcmp((char *) oper->a_id, "__notRetFlag"))
- _mesa_problem(NULL, "var %s not found!\n", (char *) oper->a_id);
- return;
- }
-
- /* look for a substitution */
- for (i = 0; i < substCount; i++) {
- if (v == substOld[i]) {
- /* OK, replace this SLANG_OPER_IDENTIFIER with a new expr */
-#if 0 /* DEBUG only */
- if (substNew[i]->type == SLANG_OPER_IDENTIFIER) {
- assert(substNew[i]->var);
- assert(substNew[i]->var->a_name);
- printf("Substitute %s with %s in id node %p\n",
- (char*)v->a_name, (char*) substNew[i]->var->a_name,
- (void*) oper);
- }
- else {
- printf("Substitute %s with %f in id node %p\n",
- (char*)v->a_name, substNew[i]->literal[0],
- (void*) oper);
- }
-#endif
- slang_operation_copy(oper, substNew[i]);
- break;
- }
- }
- }
- break;
-
- case SLANG_OPER_RETURN:
- {
- slang_operation *newReturn;
- /* generate new 'return' code' */
- if (slang_oper_child(oper, 0)->type == SLANG_OPER_VOID)
- newReturn = gen_return_without_expression(A, oper);
- else
- newReturn = gen_return_with_expression(A, oper);
-
- if (!newReturn)
- return;
-
- /* do substitutions on the new 'return' code */
- slang_substitute(A, newReturn,
- substCount, substOld, substNew, GL_FALSE);
-
- /* install new 'return' code */
- slang_operation_copy(oper, newReturn);
- slang_operation_destruct(newReturn);
- }
- break;
-
- case SLANG_OPER_ASSIGN:
- case SLANG_OPER_SUBSCRIPT:
- /* special case:
- * child[0] can't have substitutions but child[1] can.
- */
- slang_substitute(A, &oper->children[0],
- substCount, substOld, substNew, GL_TRUE);
- slang_substitute(A, &oper->children[1],
- substCount, substOld, substNew, GL_FALSE);
- break;
- case SLANG_OPER_FIELD:
- /* XXX NEW - test */
- slang_substitute(A, &oper->children[0],
- substCount, substOld, substNew, GL_TRUE);
- break;
- default:
- {
- GLuint i;
- for (i = 0; i < oper->num_children; i++)
- slang_substitute(A, &oper->children[i],
- substCount, substOld, substNew, GL_FALSE);
- }
- }
-}
-
-
-/**
- * Produce inline code for a call to an assembly instruction.
- * This is typically used to compile a call to a built-in function like this:
- *
- * vec4 mix(const vec4 x, const vec4 y, const vec4 a)
- * {
- * __asm vec4_lrp __retVal, a, y, x;
- * }
- *
- *
- * A call to
- * r = mix(p1, p2, p3);
- *
- * Becomes:
- *
- * mov
- * / \
- * r vec4_lrp
- * / | \
- * p3 p2 p1
- *
- * We basically translate a SLANG_OPER_CALL into a SLANG_OPER_ASM.
- */
-static slang_operation *
-slang_inline_asm_function(slang_assemble_ctx *A,
- slang_function *fun, slang_operation *oper)
-{
- const GLuint numArgs = oper->num_children;
- GLuint i;
- slang_operation *inlined;
- const GLboolean haveRetValue = _slang_function_has_return_value(fun);
- slang_variable **substOld;
- slang_operation **substNew;
-
- ASSERT(slang_is_asm_function(fun));
- ASSERT(fun->param_count == numArgs + haveRetValue);
-
- /*
- printf("Inline %s as %s\n",
- (char*) fun->header.a_name,
- (char*) fun->body->children[0].a_id);
- */
-
- /*
- * We'll substitute formal params with actual args in the asm call.
- */
- substOld = (slang_variable **)
- _slang_alloc(numArgs * sizeof(slang_variable *));
- substNew = (slang_operation **)
- _slang_alloc(numArgs * sizeof(slang_operation *));
- for (i = 0; i < numArgs; i++) {
- substOld[i] = fun->parameters->variables[i];
- substNew[i] = oper->children + i;
- }
-
- /* make a copy of the code to inline */
- inlined = slang_operation_new(1);
- slang_operation_copy(inlined, &fun->body->children[0]);
- if (haveRetValue) {
- /* get rid of the __retVal child */
- inlined->num_children--;
- for (i = 0; i < inlined->num_children; i++) {
- inlined->children[i] = inlined->children[i + 1];
- }
- }
-
- /* now do formal->actual substitutions */
- slang_substitute(A, inlined, numArgs, substOld, substNew, GL_FALSE);
-
- _slang_free(substOld);
- _slang_free(substNew);
-
-#if 0
- printf("+++++++++++++ inlined asm function %s +++++++++++++\n",
- (char *) fun->header.a_name);
- slang_print_tree(inlined, 3);
- printf("+++++++++++++++++++++++++++++++++++++++++++++++++++\n");
-#endif
-
- return inlined;
-}
-
-
-/**
- * Inline the given function call operation.
- * Return a new slang_operation that corresponds to the inlined code.
- */
-static slang_operation *
-slang_inline_function_call(slang_assemble_ctx * A, slang_function *fun,
- slang_operation *oper, slang_operation *returnOper)
-{
- typedef enum {
- SUBST = 1,
- COPY_IN,
- COPY_OUT
- } ParamMode;
- ParamMode *paramMode;
- const GLboolean haveRetValue = _slang_function_has_return_value(fun);
- const GLuint numArgs = oper->num_children;
- const GLuint totalArgs = numArgs + haveRetValue;
- slang_operation *args = oper->children;
- slang_operation *inlined, *top;
- slang_variable **substOld;
- slang_operation **substNew;
- GLuint substCount, numCopyIn, i;
- slang_function *prevFunction;
- slang_variable_scope *newScope = NULL;
-
- /* save / push */
- prevFunction = A->CurFunction;
- A->CurFunction = fun;
-
- /*assert(oper->type == SLANG_OPER_CALL); (or (matrix) multiply, etc) */
- assert(fun->param_count == totalArgs);
-
- /* allocate temporary arrays */
- paramMode = (ParamMode *)
- _slang_alloc(totalArgs * sizeof(ParamMode));
- substOld = (slang_variable **)
- _slang_alloc(totalArgs * sizeof(slang_variable *));
- substNew = (slang_operation **)
- _slang_alloc(totalArgs * sizeof(slang_operation *));
-
-#if 0
- printf("\nInline call to %s (total vars=%d nparams=%d)\n",
- (char *) fun->header.a_name,
- fun->parameters->num_variables, numArgs);
-#endif
-
- if (haveRetValue && !returnOper) {
- /* Create 3-child comma sequence for inlined code:
- * child[0]: declare __resultTmp
- * child[1]: inlined function body
- * child[2]: __resultTmp
- */
- slang_operation *commaSeq;
- slang_operation *declOper = NULL;
- slang_variable *resultVar;
-
- commaSeq = slang_operation_new(1);
- commaSeq->type = SLANG_OPER_SEQUENCE;
- assert(commaSeq->locals);
- commaSeq->locals->outer_scope = oper->locals->outer_scope;
- commaSeq->num_children = 3;
- commaSeq->children = slang_operation_new(3);
- /* allocate the return var */
- resultVar = slang_variable_scope_grow(commaSeq->locals);
- /*
- printf("Alloc __resultTmp in scope %p for retval of calling %s\n",
- (void*)commaSeq->locals, (char *) fun->header.a_name);
- */
-
- resultVar->a_name = slang_atom_pool_atom(A->atoms, "__resultTmp");
- resultVar->type = fun->header.type; /* XXX copy? */
- resultVar->isTemp = GL_TRUE;
-
- /* child[0] = __resultTmp declaration */
- declOper = &commaSeq->children[0];
- declOper->type = SLANG_OPER_VARIABLE_DECL;
- declOper->a_id = resultVar->a_name;
- declOper->locals->outer_scope = commaSeq->locals;
-
- /* child[1] = function body */
- inlined = &commaSeq->children[1];
- inlined->locals->outer_scope = commaSeq->locals;
-
- /* child[2] = __resultTmp reference */
- returnOper = &commaSeq->children[2];
- returnOper->type = SLANG_OPER_IDENTIFIER;
- returnOper->a_id = resultVar->a_name;
- returnOper->locals->outer_scope = commaSeq->locals;
-
- top = commaSeq;
- }
- else {
- top = inlined = slang_operation_new(1);
- /* XXXX this may be inappropriate!!!! */
- inlined->locals->outer_scope = oper->locals->outer_scope;
- }
-
-
- assert(inlined->locals);
-
- /* Examine the parameters, look for inout/out params, look for possible
- * substitutions, etc:
- * param type behaviour
- * in copy actual to local
- * const in substitute param with actual
- * out copy out
- */
- substCount = 0;
- for (i = 0; i < totalArgs; i++) {
- slang_variable *p = fun->parameters->variables[i];
- /*
- printf("Param %d: %s %s \n", i,
- slang_type_qual_string(p->type.qualifier),
- (char *) p->a_name);
- */
- if (p->type.qualifier == SLANG_QUAL_INOUT ||
- p->type.qualifier == SLANG_QUAL_OUT) {
- /* an output param */
- slang_operation *arg;
- if (i < numArgs)
- arg = &args[i];
- else
- arg = returnOper;
- paramMode[i] = SUBST;
-
- if (arg->type == SLANG_OPER_IDENTIFIER)
- slang_resolve_variable(arg);
-
- /* replace parameter 'p' with argument 'arg' */
- substOld[substCount] = p;
- substNew[substCount] = arg; /* will get copied */
- substCount++;
- }
- else if (p->type.qualifier == SLANG_QUAL_CONST) {
- /* a constant input param */
- if (args[i].type == SLANG_OPER_IDENTIFIER ||
- args[i].type == SLANG_OPER_LITERAL_FLOAT ||
- args[i].type == SLANG_OPER_SUBSCRIPT) {
- /* replace all occurances of this parameter variable with the
- * actual argument variable or a literal.
- */
- paramMode[i] = SUBST;
- slang_resolve_variable(&args[i]);
- substOld[substCount] = p;
- substNew[substCount] = &args[i]; /* will get copied */
- substCount++;
- }
- else {
- paramMode[i] = COPY_IN;
- }
- }
- else {
- paramMode[i] = COPY_IN;
- }
- assert(paramMode[i]);
- }
-
- /* actual code inlining: */
- slang_operation_copy(inlined, fun->body);
-
- /*** XXX review this */
- assert(inlined->type == SLANG_OPER_BLOCK_NO_NEW_SCOPE ||
- inlined->type == SLANG_OPER_BLOCK_NEW_SCOPE);
- inlined->type = SLANG_OPER_BLOCK_NEW_SCOPE;
-
-#if 0
- printf("======================= orig body code ======================\n");
- printf("=== params scope = %p\n", (void*) fun->parameters);
- slang_print_tree(fun->body, 8);
- printf("======================= copied code =========================\n");
- slang_print_tree(inlined, 8);
-#endif
-
- /* do parameter substitution in inlined code: */
- slang_substitute(A, inlined, substCount, substOld, substNew, GL_FALSE);
-
-#if 0
- printf("======================= subst code ==========================\n");
- slang_print_tree(inlined, 8);
- printf("=============================================================\n");
-#endif
-
- /* New prolog statements: (inserted before the inlined code)
- * Copy the 'in' arguments.
- */
- numCopyIn = 0;
- for (i = 0; i < numArgs; i++) {
- if (paramMode[i] == COPY_IN) {
- slang_variable *p = fun->parameters->variables[i];
- /* declare parameter 'p' */
- slang_operation *decl = slang_operation_insert(&inlined->num_children,
- &inlined->children,
- numCopyIn);
-
- decl->type = SLANG_OPER_VARIABLE_DECL;
- assert(decl->locals);
- decl->locals->outer_scope = inlined->locals;
- decl->a_id = p->a_name;
- decl->num_children = 1;
- decl->children = slang_operation_new(1);
-
- /* child[0] is the var's initializer */
- slang_operation_copy(&decl->children[0], args + i);
-
- /* add parameter 'p' to the local variable scope here */
- {
- slang_variable *pCopy = slang_variable_scope_grow(inlined->locals);
- pCopy->type = p->type;
- pCopy->a_name = p->a_name;
- pCopy->array_len = p->array_len;
- }
-
- newScope = inlined->locals;
- numCopyIn++;
- }
- }
-
- /* Now add copies of the function's local vars to the new variable scope */
- for (i = totalArgs; i < fun->parameters->num_variables; i++) {
- slang_variable *p = fun->parameters->variables[i];
- slang_variable *pCopy = slang_variable_scope_grow(inlined->locals);
- pCopy->type = p->type;
- pCopy->a_name = p->a_name;
- pCopy->array_len = p->array_len;
- }
-
-
- /* New epilog statements:
- * 1. Create end of function label to jump to from return statements.
- * 2. Copy the 'out' parameter vars
- */
- {
- slang_operation *lab = slang_operation_insert(&inlined->num_children,
- &inlined->children,
- inlined->num_children);
- lab->type = SLANG_OPER_LABEL;
- lab->label = A->curFuncEndLabel;
- }
-
- for (i = 0; i < totalArgs; i++) {
- if (paramMode[i] == COPY_OUT) {
- const slang_variable *p = fun->parameters->variables[i];
- /* actualCallVar = outParam */
- /*if (i > 0 || !haveRetValue)*/
- slang_operation *ass = slang_operation_insert(&inlined->num_children,
- &inlined->children,
- inlined->num_children);
- ass->type = SLANG_OPER_ASSIGN;
- ass->num_children = 2;
- ass->locals->outer_scope = inlined->locals;
- ass->children = slang_operation_new(2);
- ass->children[0] = args[i]; /*XXX copy */
- ass->children[1].type = SLANG_OPER_IDENTIFIER;
- ass->children[1].a_id = p->a_name;
- ass->children[1].locals->outer_scope = ass->locals;
- }
- }
-
- _slang_free(paramMode);
- _slang_free(substOld);
- _slang_free(substNew);
-
- /* Update scoping to use the new local vars instead of the
- * original function's vars. This is especially important
- * for nested inlining.
- */
- if (newScope)
- slang_replace_scope(inlined, fun->parameters, newScope);
-
-#if 0
- printf("Done Inline call to %s (total vars=%d nparams=%d)\n\n",
- (char *) fun->header.a_name,
- fun->parameters->num_variables, numArgs);
- slang_print_tree(top, 0);
-#endif
-
- /* pop */
- A->CurFunction = prevFunction;
-
- return top;
-}
-
-
-/**
- * Insert declaration for "bool __notRetFlag" in given block operation.
- * This is used when we can't emit "early" return statements in subroutines.
- */
-static void
-declare_return_flag(slang_assemble_ctx *A, slang_operation *oper)
-{
- slang_operation *decl;
-
- assert(oper->type == SLANG_OPER_BLOCK_NEW_SCOPE ||
- oper->type == SLANG_OPER_SEQUENCE);
-
- decl = slang_operation_insert_child(oper, 1);
-
- slang_generate_declaration(A, oper->locals, decl,
- SLANG_SPEC_BOOL, "__notRetFlag", GL_TRUE);
-
- /*slang_print_tree(oper, 0);*/
-}
-
-
-/**
- * Recursively replace instances of the old node type with the new type.
- */
-static void
-replace_node_type(slang_operation *oper, slang_operation_type oldType,
- slang_operation_type newType)
-{
- GLuint i;
-
- if (oper->type == oldType)
- oper->type = newType;
-
- for (i = 0; i < slang_oper_num_children(oper); i++) {
- replace_node_type(slang_oper_child(oper, i), oldType, newType);
- }
-}
-
-
-
-/**
- * Test if the given function body has an "early return". That is, there's
- * a 'return' statement that's not the very last instruction in the body.
- */
-static GLboolean
-has_early_return(const slang_operation *funcBody)
-{
- GLuint retCount = _slang_count_node_type(funcBody, SLANG_OPER_RETURN);
- if (retCount == 0)
- return GL_FALSE;
- else if (retCount == 1 && _slang_is_tail_return(funcBody))
- return GL_FALSE;
- else
- return GL_TRUE;
-}
-
-
-/**
- * Emit IR code for a function call. This does one of two things:
- * 1. Inline the function's code
- * 2. Create an IR for the function's body and create a real call to it.
- */
-static slang_ir_node *
-_slang_gen_function_call(slang_assemble_ctx *A, slang_function *fun,
- slang_operation *oper, slang_operation *dest)
-{
- slang_ir_node *n;
- slang_operation *instance;
- slang_label *prevFuncEndLabel;
- char name[200];
-
- prevFuncEndLabel = A->curFuncEndLabel;
- sprintf(name, "__endOfFunc_%s_", (char *) fun->header.a_name);
- A->curFuncEndLabel = _slang_label_new(name);
- assert(A->curFuncEndLabel);
-
- /*
- * 'instance' is basically a copy of the function's body with various
- * transformations.
- */
-
- if (slang_is_asm_function(fun) && !dest) {
- /* assemble assembly function - tree style */
- instance = slang_inline_asm_function(A, fun, oper);
- }
- else {
- /* non-assembly function */
- /* We always generate an "inline-able" block of code here.
- * We may either:
- * 1. insert the inline code
- * 2. Generate a call to the "inline" code as a subroutine
- */
- const GLboolean earlyReturn = has_early_return(fun->body);
-
- if (earlyReturn && !A->EmitContReturn) {
- A->UseReturnFlag = GL_TRUE;
- }
-
- instance = slang_inline_function_call(A, fun, oper, dest);
- if (!instance)
- return NULL;
-
- if (earlyReturn) {
- /* The function we're calling has one or more 'return' statements
- * that prevent us from inlining the function's code.
- *
- * In this case, change the function's body type from
- * SLANG_OPER_BLOCK_NEW_SCOPE to SLANG_OPER_NON_INLINED_CALL.
- * During code emit this will result in a true subroutine call.
- *
- * Also, convert SLANG_OPER_RETURN_INLINED nodes to SLANG_OPER_RETURN.
- */
- slang_operation *callOper;
-
- assert(instance->type == SLANG_OPER_BLOCK_NEW_SCOPE ||
- instance->type == SLANG_OPER_SEQUENCE);
-
- if (_slang_function_has_return_value(fun) && !dest) {
- assert(instance->children[0].type == SLANG_OPER_VARIABLE_DECL);
- assert(instance->children[2].type == SLANG_OPER_IDENTIFIER);
- callOper = &instance->children[1];
- }
- else {
- callOper = instance;
- }
-
- if (A->UseReturnFlag) {
- /* Early returns not supported. Create a _returnFlag variable
- * that's set upon 'return' and tested elsewhere to no-op any
- * remaining instructions in the subroutine.
- */
- assert(callOper->type == SLANG_OPER_BLOCK_NEW_SCOPE ||
- callOper->type == SLANG_OPER_SEQUENCE);
- declare_return_flag(A, callOper);
- }
- else {
- /* We can emit real 'return' statements. If we generated any
- * 'inline return' statements during function instantiation,
- * change them back to regular 'return' statements.
- */
- replace_node_type(instance, SLANG_OPER_RETURN_INLINED,
- SLANG_OPER_RETURN);
- }
-
- callOper->type = SLANG_OPER_NON_INLINED_CALL;
- callOper->fun = fun;
- callOper->label = _slang_label_new_unique((char*) fun->header.a_name);
- }
- else {
- /* If there are any 'return' statements remaining, they're at the
- * very end of the function and can effectively become no-ops.
- */
- replace_node_type(instance, SLANG_OPER_RETURN_INLINED,
- SLANG_OPER_VOID);
- }
- }
-
- if (!instance)
- return NULL;
-
- /* Replace the function call with the instance block (or new CALL stmt) */
- slang_operation_destruct(oper);
- *oper = *instance;
- _slang_free(instance);
-
-#if 0
- assert(instance->locals);
- printf("*** Inlined code for call to %s:\n", (char*) fun->header.a_name);
- slang_print_tree(oper, 10);
- printf("\n");
-#endif
-
- n = _slang_gen_operation(A, oper);
-
- /*_slang_label_delete(A->curFuncEndLabel);*/
- A->curFuncEndLabel = prevFuncEndLabel;
-
- if (A->pragmas->Debug) {
- char s[1000];
- _mesa_snprintf(s, sizeof(s), "Call/inline %s()", (char *) fun->header.a_name);
- n->Comment = _slang_strdup(s);
- }
-
- A->UseReturnFlag = GL_FALSE;
-
- return n;
-}
-
-
-static slang_asm_info *
-slang_find_asm_info(const char *name)
-{
- GLuint i;
- for (i = 0; AsmInfo[i].Name; i++) {
- if (strcmp(AsmInfo[i].Name, name) == 0) {
- return AsmInfo + i;
- }
- }
- return NULL;
-}
-
-
-/**
- * Some write-masked assignments are simple, but others are hard.
- * Simple example:
- * vec3 v;
- * v.xy = vec2(a, b);
- * Hard example:
- * vec3 v;
- * v.zy = vec2(a, b);
- * this gets transformed/swizzled into:
- * v.zy = vec2(a, b).*yx* (* = don't care)
- * This function helps to determine simple vs. non-simple.
- */
-static GLboolean
-_slang_simple_writemask(GLuint writemask, GLuint swizzle)
-{
- switch (writemask) {
- case WRITEMASK_X:
- return GET_SWZ(swizzle, 0) == SWIZZLE_X;
- case WRITEMASK_Y:
- return GET_SWZ(swizzle, 1) == SWIZZLE_Y;
- case WRITEMASK_Z:
- return GET_SWZ(swizzle, 2) == SWIZZLE_Z;
- case WRITEMASK_W:
- return GET_SWZ(swizzle, 3) == SWIZZLE_W;
- case WRITEMASK_XY:
- return (GET_SWZ(swizzle, 0) == SWIZZLE_X)
- && (GET_SWZ(swizzle, 1) == SWIZZLE_Y);
- case WRITEMASK_XYZ:
- return (GET_SWZ(swizzle, 0) == SWIZZLE_X)
- && (GET_SWZ(swizzle, 1) == SWIZZLE_Y)
- && (GET_SWZ(swizzle, 2) == SWIZZLE_Z);
- case WRITEMASK_XYZW:
- return swizzle == SWIZZLE_NOOP;
- default:
- return GL_FALSE;
- }
-}
-
-
-/**
- * Convert the given swizzle into a writemask. In some cases this
- * is trivial, in other cases, we'll need to also swizzle the right
- * hand side to put components in the right places.
- * See comment above for more info.
- * XXX this function could be simplified and should probably be renamed.
- * \param swizzle the incoming swizzle
- * \param writemaskOut returns the writemask
- * \param swizzleOut swizzle to apply to the right-hand-side
- * \return GL_FALSE for simple writemasks, GL_TRUE for non-simple
- */
-static GLboolean
-swizzle_to_writemask(slang_assemble_ctx *A, GLuint swizzle,
- GLuint *writemaskOut, GLuint *swizzleOut)
-{
- GLuint mask = 0x0, newSwizzle[4];
- GLint i, size;
-
- /* make new dst writemask, compute size */
- for (i = 0; i < 4; i++) {
- const GLuint swz = GET_SWZ(swizzle, i);
- if (swz == SWIZZLE_NIL) {
- /* end */
- break;
- }
- assert(swz <= 3);
-
- if (swizzle != SWIZZLE_XXXX &&
- swizzle != SWIZZLE_YYYY &&
- swizzle != SWIZZLE_ZZZZ &&
- swizzle != SWIZZLE_WWWW &&
- (mask & (1 << swz))) {
- /* a channel can't be specified twice (ex: ".xyyz") */
- slang_info_log_error(A->log, "Invalid writemask '%s'",
- _mesa_swizzle_string(swizzle, 0, 0));
- return GL_FALSE;
- }
-
- mask |= (1 << swz);
- }
- assert(mask <= 0xf);
- size = i; /* number of components in mask/swizzle */
-
- *writemaskOut = mask;
-
- /* make new src swizzle, by inversion */
- for (i = 0; i < 4; i++) {
- newSwizzle[i] = i; /*identity*/
- }
- for (i = 0; i < size; i++) {
- const GLuint swz = GET_SWZ(swizzle, i);
- newSwizzle[swz] = i;
- }
- *swizzleOut = MAKE_SWIZZLE4(newSwizzle[0],
- newSwizzle[1],
- newSwizzle[2],
- newSwizzle[3]);
-
- if (_slang_simple_writemask(mask, *swizzleOut)) {
- if (size >= 1)
- assert(GET_SWZ(*swizzleOut, 0) == SWIZZLE_X);
- if (size >= 2)
- assert(GET_SWZ(*swizzleOut, 1) == SWIZZLE_Y);
- if (size >= 3)
- assert(GET_SWZ(*swizzleOut, 2) == SWIZZLE_Z);
- if (size >= 4)
- assert(GET_SWZ(*swizzleOut, 3) == SWIZZLE_W);
- return GL_TRUE;
- }
- else
- return GL_FALSE;
-}
-
-
-#if 0 /* not used, but don't remove just yet */
-/**
- * Recursively traverse 'oper' to produce a swizzle mask in the event
- * of any vector subscripts and swizzle suffixes.
- * Ex: for "vec4 v", "v[2].x" resolves to v.z
- */
-static GLuint
-resolve_swizzle(const slang_operation *oper)
-{
- if (oper->type == SLANG_OPER_FIELD) {
- /* writemask from .xyzw suffix */
- slang_swizzle swz;
- if (_slang_is_swizzle((char*) oper->a_id, 4, &swz)) {
- GLuint swizzle = MAKE_SWIZZLE4(swz.swizzle[0],
- swz.swizzle[1],
- swz.swizzle[2],
- swz.swizzle[3]);
- GLuint child_swizzle = resolve_swizzle(&oper->children[0]);
- GLuint s = _slang_swizzle_swizzle(child_swizzle, swizzle);
- return s;
- }
- else
- return SWIZZLE_XYZW;
- }
- else if (oper->type == SLANG_OPER_SUBSCRIPT &&
- oper->children[1].type == SLANG_OPER_LITERAL_INT) {
- /* writemask from [index] */
- GLuint child_swizzle = resolve_swizzle(&oper->children[0]);
- GLuint i = (GLuint) oper->children[1].literal[0];
- GLuint swizzle;
- GLuint s;
- switch (i) {
- case 0:
- swizzle = SWIZZLE_XXXX;
- break;
- case 1:
- swizzle = SWIZZLE_YYYY;
- break;
- case 2:
- swizzle = SWIZZLE_ZZZZ;
- break;
- case 3:
- swizzle = SWIZZLE_WWWW;
- break;
- default:
- swizzle = SWIZZLE_XYZW;
- }
- s = _slang_swizzle_swizzle(child_swizzle, swizzle);
- return s;
- }
- else {
- return SWIZZLE_XYZW;
- }
-}
-#endif
-
-
-#if 0
-/**
- * Recursively descend through swizzle nodes to find the node's storage info.
- */
-static slang_ir_storage *
-get_store(const slang_ir_node *n)
-{
- if (n->Opcode == IR_SWIZZLE) {
- return get_store(n->Children[0]);
- }
- return n->Store;
-}
-#endif
-
-
-/**
- * Generate IR tree for an asm instruction/operation such as:
- * __asm vec4_dot __retVal.x, v1, v2;
- */
-static slang_ir_node *
-_slang_gen_asm(slang_assemble_ctx *A, slang_operation *oper,
- slang_operation *dest)
-{
- const slang_asm_info *info;
- slang_ir_node *kids[3], *n;
- GLuint j, firstOperand;
-
- assert(oper->type == SLANG_OPER_ASM);
-
- info = slang_find_asm_info((char *) oper->a_id);
- if (!info) {
- _mesa_problem(NULL, "undefined __asm function %s\n",
- (char *) oper->a_id);
- assert(info);
- return NULL;
- }
- assert(info->NumParams <= 3);
-
- if (info->NumParams == oper->num_children) {
- /* Storage for result is not specified.
- * Children[0], [1], [2] are the operands.
- */
- firstOperand = 0;
- }
- else {
- /* Storage for result (child[0]) is specified.
- * Children[1], [2], [3] are the operands.
- */
- firstOperand = 1;
- }
-
- /* assemble child(ren) */
- kids[0] = kids[1] = kids[2] = NULL;
- for (j = 0; j < info->NumParams; j++) {
- kids[j] = _slang_gen_operation(A, &oper->children[firstOperand + j]);
- if (!kids[j])
- return NULL;
- }
-
- n = new_node3(info->Opcode, kids[0], kids[1], kids[2]);
-
- if (firstOperand) {
- /* Setup n->Store to be a particular location. Otherwise, storage
- * for the result (a temporary) will be allocated later.
- */
- slang_operation *dest_oper;
- slang_ir_node *n0;
-
- dest_oper = &oper->children[0];
-
- n0 = _slang_gen_operation(A, dest_oper);
- if (!n0)
- return NULL;
-
- assert(!n->Store);
- n->Store = n0->Store;
-
- assert(n->Store->File != PROGRAM_UNDEFINED || n->Store->Parent);
-
- _slang_free(n0);
- }
-
- return n;
-}
-
-
-#if 0
-static void
-print_funcs(struct slang_function_scope_ *scope, const char *name)
-{
- GLuint i;
- for (i = 0; i < scope->num_functions; i++) {
- slang_function *f = &scope->functions[i];
- if (!name || strcmp(name, (char*) f->header.a_name) == 0)
- printf(" %s (%d args)\n", name, f->param_count);
-
- }
- if (scope->outer_scope)
- print_funcs(scope->outer_scope, name);
-}
-#endif
-
-
-/**
- * Find a function of the given name, taking 'numArgs' arguments.
- * This is the function we'll try to call when there is no exact match
- * between function parameters and call arguments.
- *
- * XXX we should really create a list of candidate functions and try
- * all of them...
- */
-static slang_function *
-_slang_find_function_by_argc(slang_function_scope *scope,
- const char *name, int numArgs)
-{
- while (scope) {
- GLuint i;
- for (i = 0; i < scope->num_functions; i++) {
- slang_function *f = &scope->functions[i];
- if (strcmp(name, (char*) f->header.a_name) == 0) {
- int haveRetValue = _slang_function_has_return_value(f);
- if (numArgs == f->param_count - haveRetValue)
- return f;
- }
- }
- scope = scope->outer_scope;
- }
-
- return NULL;
-}
-
-
-static slang_function *
-_slang_find_function_by_max_argc(slang_function_scope *scope,
- const char *name)
-{
- slang_function *maxFunc = NULL;
- GLuint maxArgs = 0;
-
- while (scope) {
- GLuint i;
- for (i = 0; i < scope->num_functions; i++) {
- slang_function *f = &scope->functions[i];
- if (strcmp(name, (char*) f->header.a_name) == 0) {
- if (f->param_count > maxArgs) {
- maxArgs = f->param_count;
- maxFunc = f;
- }
- }
- }
- scope = scope->outer_scope;
- }
-
- return maxFunc;
-}
-
-
-/**
- * Generate a new slang_function which is a constructor for a user-defined
- * struct type.
- */
-static slang_function *
-_slang_make_struct_constructor(slang_assemble_ctx *A, slang_struct *str)
-{
- const GLint numFields = str->fields->num_variables;
- slang_function *fun = slang_function_new(SLANG_FUNC_CONSTRUCTOR);
-
- /* function header (name, return type) */
- fun->header.a_name = str->a_name;
- fun->header.type.qualifier = SLANG_QUAL_NONE;
- fun->header.type.specifier.type = SLANG_SPEC_STRUCT;
- fun->header.type.specifier._struct = str;
-
- /* function parameters (= struct's fields) */
- {
- GLint i;
- for (i = 0; i < numFields; i++) {
- /*
- printf("Field %d: %s\n", i, (char*) str->fields->variables[i]->a_name);
- */
- slang_variable *p = slang_variable_scope_grow(fun->parameters);
- *p = *str->fields->variables[i]; /* copy the variable and type */
- p->type.qualifier = SLANG_QUAL_CONST;
- }
- fun->param_count = fun->parameters->num_variables;
- }
-
- /* Add __retVal to params */
- {
- slang_variable *p = slang_variable_scope_grow(fun->parameters);
- slang_atom a_retVal = slang_atom_pool_atom(A->atoms, "__retVal");
- assert(a_retVal);
- p->a_name = a_retVal;
- p->type = fun->header.type;
- p->type.qualifier = SLANG_QUAL_OUT;
- fun->param_count++;
- }
-
- /* function body is:
- * block:
- * declare T;
- * T.f1 = p1;
- * T.f2 = p2;
- * ...
- * T.fn = pn;
- * return T;
- */
- {
- slang_variable_scope *scope;
- slang_variable *var;
- GLint i;
-
- fun->body = slang_operation_new(1);
- fun->body->type = SLANG_OPER_BLOCK_NEW_SCOPE;
- fun->body->num_children = numFields + 2;
- fun->body->children = slang_operation_new(numFields + 2);
-
- scope = fun->body->locals;
- scope->outer_scope = fun->parameters;
-
- /* create local var 't' */
- var = slang_variable_scope_grow(scope);
- var->a_name = slang_atom_pool_atom(A->atoms, "t");
- var->type = fun->header.type;
-
- /* declare t */
- {
- slang_operation *decl;
-
- decl = &fun->body->children[0];
- decl->type = SLANG_OPER_VARIABLE_DECL;
- decl->locals = _slang_variable_scope_new(scope);
- decl->a_id = var->a_name;
- }
-
- /* assign params to fields of t */
- for (i = 0; i < numFields; i++) {
- slang_operation *assign = &fun->body->children[1 + i];
-
- assign->type = SLANG_OPER_ASSIGN;
- assign->locals = _slang_variable_scope_new(scope);
- assign->num_children = 2;
- assign->children = slang_operation_new(2);
-
- {
- slang_operation *lhs = &assign->children[0];
-
- lhs->type = SLANG_OPER_FIELD;
- lhs->locals = _slang_variable_scope_new(scope);
- lhs->num_children = 1;
- lhs->children = slang_operation_new(1);
- lhs->a_id = str->fields->variables[i]->a_name;
-
- lhs->children[0].type = SLANG_OPER_IDENTIFIER;
- lhs->children[0].a_id = var->a_name;
- lhs->children[0].locals = _slang_variable_scope_new(scope);
-
-#if 0
- lhs->children[1].num_children = 1;
- lhs->children[1].children = slang_operation_new(1);
- lhs->children[1].children[0].type = SLANG_OPER_IDENTIFIER;
- lhs->children[1].children[0].a_id = str->fields->variables[i]->a_name;
- lhs->children[1].children->locals = _slang_variable_scope_new(scope);
-#endif
- }
-
- {
- slang_operation *rhs = &assign->children[1];
-
- rhs->type = SLANG_OPER_IDENTIFIER;
- rhs->locals = _slang_variable_scope_new(scope);
- rhs->a_id = str->fields->variables[i]->a_name;
- }
- }
-
- /* return t; */
- {
- slang_operation *ret = &fun->body->children[numFields + 1];
-
- ret->type = SLANG_OPER_RETURN;
- ret->locals = _slang_variable_scope_new(scope);
- ret->num_children = 1;
- ret->children = slang_operation_new(1);
- ret->children[0].type = SLANG_OPER_IDENTIFIER;
- ret->children[0].a_id = var->a_name;
- ret->children[0].locals = _slang_variable_scope_new(scope);
- }
- }
- /*
- slang_print_function(fun, 1);
- */
- return fun;
-}
-
-
-/**
- * Find/create a function (constructor) for the given structure name.
- */
-static slang_function *
-_slang_locate_struct_constructor(slang_assemble_ctx *A, const char *name)
-{
- unsigned int i;
- for (i = 0; i < A->space.structs->num_structs; i++) {
- slang_struct *str = &A->space.structs->structs[i];
- if (strcmp(name, (const char *) str->a_name) == 0) {
- /* found a structure type that matches the function name */
- if (!str->constructor) {
- /* create the constructor function now */
- str->constructor = _slang_make_struct_constructor(A, str);
- }
- return str->constructor;
- }
- }
- return NULL;
-}
-
-
-/**
- * Generate a new slang_function to satisfy a call to an array constructor.
- * Ex: float[3](1., 2., 3.)
- */
-static slang_function *
-_slang_make_array_constructor(slang_assemble_ctx *A, slang_operation *oper)
-{
- slang_type_specifier_type baseType;
- slang_function *fun;
- int num_elements;
-
- fun = slang_function_new(SLANG_FUNC_CONSTRUCTOR);
- if (!fun)
- return NULL;
-
- baseType = slang_type_specifier_type_from_string((char *) oper->a_id);
-
- num_elements = oper->num_children;
-
- /* function header, return type */
- {
- fun->header.a_name = oper->a_id;
- fun->header.type.qualifier = SLANG_QUAL_NONE;
- fun->header.type.specifier.type = SLANG_SPEC_ARRAY;
- fun->header.type.specifier._array =
- slang_type_specifier_new(baseType, NULL, NULL);
- fun->header.type.array_len = num_elements;
- }
-
- /* function parameters (= number of elements) */
- {
- GLint i;
- for (i = 0; i < num_elements; i++) {
- /*
- printf("Field %d: %s\n", i, (char*) str->fields->variables[i]->a_name);
- */
- slang_variable *p = slang_variable_scope_grow(fun->parameters);
- char name[10];
- _mesa_snprintf(name, sizeof(name), "p%d", i);
- p->a_name = slang_atom_pool_atom(A->atoms, name);
- p->type.qualifier = SLANG_QUAL_CONST;
- p->type.specifier.type = baseType;
- }
- fun->param_count = fun->parameters->num_variables;
- }
-
- /* Add __retVal to params */
- {
- slang_variable *p = slang_variable_scope_grow(fun->parameters);
- slang_atom a_retVal = slang_atom_pool_atom(A->atoms, "__retVal");
- assert(a_retVal);
- p->a_name = a_retVal;
- p->type = fun->header.type;
- p->type.qualifier = SLANG_QUAL_OUT;
- p->type.specifier.type = baseType;
- fun->param_count++;
- }
-
- /* function body is:
- * block:
- * declare T;
- * T[0] = p0;
- * T[1] = p1;
- * ...
- * T[n] = pn;
- * return T;
- */
- {
- slang_variable_scope *scope;
- slang_variable *var;
- GLint i;
-
- fun->body = slang_operation_new(1);
- fun->body->type = SLANG_OPER_BLOCK_NEW_SCOPE;
- fun->body->num_children = num_elements + 2;
- fun->body->children = slang_operation_new(num_elements + 2);
-
- scope = fun->body->locals;
- scope->outer_scope = fun->parameters;
-
- /* create local var 't' */
- var = slang_variable_scope_grow(scope);
- var->a_name = slang_atom_pool_atom(A->atoms, "ttt");
- var->type = fun->header.type;/*XXX copy*/
-
- /* declare t */
- {
- slang_operation *decl;
-
- decl = &fun->body->children[0];
- decl->type = SLANG_OPER_VARIABLE_DECL;
- decl->locals = _slang_variable_scope_new(scope);
- decl->a_id = var->a_name;
- }
-
- /* assign params to elements of t */
- for (i = 0; i < num_elements; i++) {
- slang_operation *assign = &fun->body->children[1 + i];
-
- assign->type = SLANG_OPER_ASSIGN;
- assign->locals = _slang_variable_scope_new(scope);
- assign->num_children = 2;
- assign->children = slang_operation_new(2);
-
- {
- slang_operation *lhs = &assign->children[0];
-
- lhs->type = SLANG_OPER_SUBSCRIPT;
- lhs->locals = _slang_variable_scope_new(scope);
- lhs->num_children = 2;
- lhs->children = slang_operation_new(2);
-
- lhs->children[0].type = SLANG_OPER_IDENTIFIER;
- lhs->children[0].a_id = var->a_name;
- lhs->children[0].locals = _slang_variable_scope_new(scope);
-
- lhs->children[1].type = SLANG_OPER_LITERAL_INT;
- lhs->children[1].literal[0] = (GLfloat) i;
- }
-
- {
- slang_operation *rhs = &assign->children[1];
-
- rhs->type = SLANG_OPER_IDENTIFIER;
- rhs->locals = _slang_variable_scope_new(scope);
- rhs->a_id = fun->parameters->variables[i]->a_name;
- }
- }
-
- /* return t; */
- {
- slang_operation *ret = &fun->body->children[num_elements + 1];
-
- ret->type = SLANG_OPER_RETURN;
- ret->locals = _slang_variable_scope_new(scope);
- ret->num_children = 1;
- ret->children = slang_operation_new(1);
- ret->children[0].type = SLANG_OPER_IDENTIFIER;
- ret->children[0].a_id = var->a_name;
- ret->children[0].locals = _slang_variable_scope_new(scope);
- }
- }
-
- /*
- slang_print_function(fun, 1);
- */
-
- return fun;
-}
-
-
-static GLboolean
-_slang_is_vec_mat_type(const char *name)
-{
- static const char *vecmat_types[] = {
- "float", "int", "bool",
- "vec2", "vec3", "vec4",
- "ivec2", "ivec3", "ivec4",
- "bvec2", "bvec3", "bvec4",
- "mat2", "mat3", "mat4",
- "mat2x3", "mat2x4", "mat3x2", "mat3x4", "mat4x2", "mat4x3",
- NULL
- };
- int i;
- for (i = 0; vecmat_types[i]; i++)
- if (strcmp(name, vecmat_types[i]) == 0)
- return GL_TRUE;
- return GL_FALSE;
-}
-
-
-/**
- * Assemble a function call, given a particular function name.
- * \param name the function's name (operators like '*' are possible).
- */
-static slang_ir_node *
-_slang_gen_function_call_name(slang_assemble_ctx *A, const char *name,
- slang_operation *oper, slang_operation *dest)
-{
- slang_operation *params = oper->children;
- const GLuint param_count = oper->num_children;
- slang_atom atom;
- slang_function *fun;
- slang_ir_node *n;
-
- atom = slang_atom_pool_atom(A->atoms, name);
- if (atom == SLANG_ATOM_NULL)
- return NULL;
-
- if (oper->array_constructor) {
- /* this needs special handling */
- fun = _slang_make_array_constructor(A, oper);
- }
- else {
- /* Try to find function by name and exact argument type matching */
- GLboolean error = GL_FALSE;
- fun = _slang_function_locate(A->space.funcs, atom, params, param_count,
- &A->space, A->atoms, A->log, &error);
- if (error) {
- slang_info_log_error(A->log,
- "Function '%s' not found (check argument types)",
- name);
- return NULL;
- }
- }
-
- if (!fun) {
- /* Next, try locating a constructor function for a user-defined type */
- fun = _slang_locate_struct_constructor(A, name);
- }
-
- /*
- * At this point, some heuristics are used to try to find a function
- * that matches the calling signature by means of casting or "unrolling"
- * of constructors.
- */
-
- if (!fun && _slang_is_vec_mat_type(name)) {
- /* Next, if this call looks like a vec() or mat() constructor call,
- * try "unwinding" the args to satisfy a constructor.
- */
- fun = _slang_find_function_by_max_argc(A->space.funcs, name);
- if (fun) {
- if (!_slang_adapt_call(oper, fun, &A->space, A->atoms, A->log)) {
- slang_info_log_error(A->log,
- "Function '%s' not found (check argument types)",
- name);
- return NULL;
- }
- }
- }
-
- if (!fun && _slang_is_vec_mat_type(name)) {
- /* Next, try casting args to the types of the formal parameters */
- int numArgs = oper->num_children;
- fun = _slang_find_function_by_argc(A->space.funcs, name, numArgs);
- if (!fun || !_slang_cast_func_params(oper, fun, &A->space, A->atoms, A->log)) {
- slang_info_log_error(A->log,
- "Function '%s' not found (check argument types)",
- name);
- return NULL;
- }
- assert(fun);
- }
-
- if (!fun) {
- slang_info_log_error(A->log,
- "Function '%s' not found (check argument types)",
- name);
- return NULL;
- }
-
- if (!fun->body) {
- /* The function body may be in another compilation unit.
- * We'll try concatenating the shaders and recompile at link time.
- */
- A->UnresolvedRefs = GL_TRUE;
- return new_node1(IR_NOP, NULL);
- }
-
- /* type checking to be sure function's return type matches 'dest' type */
- if (dest) {
- slang_typeinfo t0;
-
- slang_typeinfo_construct(&t0);
- typeof_operation(A, dest, &t0);
-
- if (!slang_type_specifier_equal(&t0.spec, &fun->header.type.specifier)) {
- slang_info_log_error(A->log,
- "Incompatible type returned by call to '%s'",
- name);
- return NULL;
- }
- }
-
- n = _slang_gen_function_call(A, fun, oper, dest);
-
- if (n && !n->Store && !dest
- && fun->header.type.specifier.type != SLANG_SPEC_VOID) {
- /* setup n->Store for the result of the function call */
- GLint size = _slang_sizeof_type_specifier(&fun->header.type.specifier);
- n->Store = _slang_new_ir_storage(PROGRAM_TEMPORARY, -1, size);
- /*printf("Alloc storage for function result, size %d \n", size);*/
- }
-
- if (oper->array_constructor) {
- /* free the temporary array constructor function now */
- slang_function_destruct(fun);
- }
-
- return n;
-}
-
-
-static slang_ir_node *
-_slang_gen_method_call(slang_assemble_ctx *A, slang_operation *oper)
-{
- slang_atom *a_length = slang_atom_pool_atom(A->atoms, "length");
- slang_ir_node *n;
- slang_variable *var;
-
- /* NOTE: In GLSL 1.20, there's only one kind of method
- * call: array.length(). Anything else is an error.
- */
- if (oper->a_id != a_length) {
- slang_info_log_error(A->log,
- "Undefined method call '%s'", (char *) oper->a_id);
- return NULL;
- }
-
- /* length() takes no arguments */
- if (oper->num_children > 0) {
- slang_info_log_error(A->log, "Invalid arguments to length() method");
- return NULL;
- }
-
- /* lookup the object/variable */
- var = _slang_variable_locate(oper->locals, oper->a_obj, GL_TRUE);
- if (!var || var->type.specifier.type != SLANG_SPEC_ARRAY) {
- slang_info_log_error(A->log,
- "Undefined object '%s'", (char *) oper->a_obj);
- return NULL;
- }
-
- /* Create a float/literal IR node encoding the array length */
- n = new_node0(IR_FLOAT);
- if (n) {
- n->Value[0] = (float) _slang_array_length(var);
- n->Store = _slang_new_ir_storage(PROGRAM_CONSTANT, -1, 1);
- }
- return n;
-}
-
-
-static GLboolean
-_slang_is_constant_cond(const slang_operation *oper, GLboolean *value)
-{
- if (oper->type == SLANG_OPER_LITERAL_FLOAT ||
- oper->type == SLANG_OPER_LITERAL_INT ||
- oper->type == SLANG_OPER_LITERAL_BOOL) {
- if (oper->literal[0])
- *value = GL_TRUE;
- else
- *value = GL_FALSE;
- return GL_TRUE;
- }
- else if (oper->type == SLANG_OPER_EXPRESSION &&
- oper->num_children == 1) {
- return _slang_is_constant_cond(&oper->children[0], value);
- }
- return GL_FALSE;
-}
-
-
-/**
- * Test if an operation is a scalar or boolean.
- */
-static GLboolean
-_slang_is_scalar_or_boolean(slang_assemble_ctx *A, slang_operation *oper)
-{
- slang_typeinfo type;
- GLint size;
-
- slang_typeinfo_construct(&type);
- typeof_operation(A, oper, &type);
- size = _slang_sizeof_type_specifier(&type.spec);
- slang_typeinfo_destruct(&type);
- return size == 1;
-}
-
-
-/**
- * Test if an operation is boolean.
- */
-static GLboolean
-_slang_is_boolean(slang_assemble_ctx *A, slang_operation *oper)
-{
- slang_typeinfo type;
- GLboolean isBool;
-
- slang_typeinfo_construct(&type);
- typeof_operation(A, oper, &type);
- isBool = (type.spec.type == SLANG_SPEC_BOOL);
- slang_typeinfo_destruct(&type);
- return isBool;
-}
-
-
-/**
- * Check if a loop contains a 'continue' statement.
- * Stop looking if we find a nested loop.
- */
-static GLboolean
-_slang_loop_contains_continue(const slang_operation *oper)
-{
- switch (oper->type) {
- case SLANG_OPER_CONTINUE:
- return GL_TRUE;
- case SLANG_OPER_FOR:
- case SLANG_OPER_DO:
- case SLANG_OPER_WHILE:
- /* stop upon finding a nested loop */
- return GL_FALSE;
- default:
- /* recurse */
- {
- GLuint i;
- for (i = 0; i < oper->num_children; i++) {
- const slang_operation *child = slang_oper_child_const(oper, i);
- if (_slang_loop_contains_continue(child))
- return GL_TRUE;
- }
- }
- return GL_FALSE;
- }
-}
-
-
-/**
- * Check if a loop contains a 'continue' or 'break' statement.
- * Stop looking if we find a nested loop.
- */
-static GLboolean
-_slang_loop_contains_continue_or_break(const slang_operation *oper)
-{
- switch (oper->type) {
- case SLANG_OPER_CONTINUE:
- case SLANG_OPER_BREAK:
- return GL_TRUE;
- case SLANG_OPER_FOR:
- case SLANG_OPER_DO:
- case SLANG_OPER_WHILE:
- /* stop upon finding a nested loop */
- return GL_FALSE;
- default:
- /* recurse */
- {
- GLuint i;
- for (i = 0; i < oper->num_children; i++) {
- const slang_operation *child = slang_oper_child_const(oper, i);
- if (_slang_loop_contains_continue_or_break(child))
- return GL_TRUE;
- }
- }
- return GL_FALSE;
- }
-}
-
-
-/**
- * Replace 'break' and 'continue' statements inside a do and while loops.
- * This is a recursive helper function used by
- * _slang_gen_do/while_without_continue().
- */
-static void
-replace_break_and_cont(slang_assemble_ctx *A, slang_operation *oper)
-{
- switch (oper->type) {
- case SLANG_OPER_BREAK:
- /* replace 'break' with "_notBreakFlag = false; break" */
- {
- slang_operation *block = oper;
- block->type = SLANG_OPER_BLOCK_NEW_SCOPE;
- slang_operation_add_children(block, 2);
- {
- slang_operation *assign = slang_oper_child(block, 0);
- assign->type = SLANG_OPER_ASSIGN;
- slang_operation_add_children(assign, 2);
- {
- slang_operation *lhs = slang_oper_child(assign, 0);
- slang_operation_identifier(lhs, A, "_notBreakFlag");
- }
- {
- slang_operation *rhs = slang_oper_child(assign, 1);
- slang_operation_literal_bool(rhs, GL_FALSE);
- }
- }
- {
- slang_operation *brk = slang_oper_child(block, 1);
- brk->type = SLANG_OPER_BREAK;
- assert(!brk->children);
- }
- }
- break;
- case SLANG_OPER_CONTINUE:
- /* convert continue into a break */
- oper->type = SLANG_OPER_BREAK;
- break;
- case SLANG_OPER_FOR:
- case SLANG_OPER_DO:
- case SLANG_OPER_WHILE:
- /* stop upon finding a nested loop */
- break;
- default:
- /* recurse */
- {
- GLuint i;
- for (i = 0; i < oper->num_children; i++) {
- replace_break_and_cont(A, slang_oper_child(oper, i));
- }
- }
- }
-}
-
-
-/**
- * Transform a while-loop so that continue statements are converted to breaks.
- * Then do normal IR code generation.
- *
- * Before:
- *
- * while (LOOPCOND) {
- * A;
- * if (IFCOND)
- * continue;
- * B;
- * break;
- * C;
- * }
- *
- * After:
- *
- * {
- * bool _notBreakFlag = 1;
- * while (_notBreakFlag && LOOPCOND) {
- * do {
- * A;
- * if (IFCOND) {
- * break; // was continue
- * }
- * B;
- * _notBreakFlag = 0; // was
- * break; // break
- * C;
- * } while (0)
- * }
- * }
- */
-static slang_ir_node *
-_slang_gen_while_without_continue(slang_assemble_ctx *A, slang_operation *oper)
-{
- slang_operation *top;
- slang_operation *innerBody;
-
- assert(oper->type == SLANG_OPER_WHILE);
-
- top = slang_operation_new(1);
- top->type = SLANG_OPER_BLOCK_NEW_SCOPE;
- top->locals->outer_scope = oper->locals->outer_scope;
- slang_operation_add_children(top, 2);
-
- /* declare: bool _notBreakFlag = true */
- {
- slang_operation *condDecl = slang_oper_child(top, 0);
- slang_generate_declaration(A, top->locals, condDecl,
- SLANG_SPEC_BOOL, "_notBreakFlag", GL_TRUE);
- }
-
- /* build outer while-loop: while (_notBreakFlag && LOOPCOND) { ... } */
- {
- slang_operation *outerWhile = slang_oper_child(top, 1);
- outerWhile->type = SLANG_OPER_WHILE;
- slang_operation_add_children(outerWhile, 2);
-
- /* _notBreakFlag && LOOPCOND */
- {
- slang_operation *cond = slang_oper_child(outerWhile, 0);
- cond->type = SLANG_OPER_LOGICALAND;
- slang_operation_add_children(cond, 2);
- {
- slang_operation *notBreak = slang_oper_child(cond, 0);
- slang_operation_identifier(notBreak, A, "_notBreakFlag");
- }
- {
- slang_operation *origCond = slang_oper_child(cond, 1);
- slang_operation_copy(origCond, slang_oper_child(oper, 0));
- }
- }
-
- /* inner loop */
- {
- slang_operation *innerDo = slang_oper_child(outerWhile, 1);
- innerDo->type = SLANG_OPER_DO;
- slang_operation_add_children(innerDo, 2);
-
- /* copy original do-loop body into inner do-loop's body */
- innerBody = slang_oper_child(innerDo, 0);
- slang_operation_copy(innerBody, slang_oper_child(oper, 1));
- innerBody->locals->outer_scope = innerDo->locals;
-
- /* inner do-loop's condition is constant/false */
- {
- slang_operation *constFalse = slang_oper_child(innerDo, 1);
- slang_operation_literal_bool(constFalse, GL_FALSE);
- }
- }
- }
-
- /* Finally, in innerBody,
- * replace "break" with "_notBreakFlag = 0; break"
- * replace "continue" with "break"
- */
- replace_break_and_cont(A, innerBody);
-
- /*slang_print_tree(top, 0);*/
-
- return _slang_gen_operation(A, top);
-
- return NULL;
-}
-
-
-/**
- * Generate loop code using high-level IR_LOOP instruction
- */
-static slang_ir_node *
-_slang_gen_while(slang_assemble_ctx * A, slang_operation *oper)
-{
- /*
- * LOOP:
- * BREAK if !expr (child[0])
- * body code (child[1])
- */
- slang_ir_node *loop, *breakIf, *body;
- GLboolean isConst, constTrue = GL_FALSE;
-
- if (!A->EmitContReturn) {
- /* We don't want to emit CONT instructions. If this while-loop has
- * a continue, translate it away.
- */
- if (_slang_loop_contains_continue(slang_oper_child(oper, 1))) {
- return _slang_gen_while_without_continue(A, oper);
- }
- }
-
- /* type-check expression */
- if (!_slang_is_boolean(A, &oper->children[0])) {
- slang_info_log_error(A->log, "scalar/boolean expression expected for 'while'");
- return NULL;
- }
-
- /* Check if loop condition is a constant */
- isConst = _slang_is_constant_cond(&oper->children[0], &constTrue);
-
- if (isConst && !constTrue) {
- /* loop is never executed! */
- return new_node0(IR_NOP);
- }
-
- /* Begin new loop */
- loop = new_loop(NULL);
-
- /* save loop state */
- push_loop(A, oper, loop);
-
- if (isConst && constTrue) {
- /* while(nonzero constant), no conditional break */
- breakIf = NULL;
- }
- else {
- slang_ir_node *cond
- = new_cond(new_not(_slang_gen_operation(A, &oper->children[0])));
- breakIf = new_break_if_true(A, cond);
- }
- body = _slang_gen_operation(A, &oper->children[1]);
- loop->Children[0] = new_seq(breakIf, body);
-
- /* Do infinite loop detection */
- /* loop->List is head of linked list of break/continue nodes */
- if (!loop->List && isConst && constTrue) {
- /* infinite loop detected */
- pop_loop(A);
- slang_info_log_error(A->log, "Infinite loop detected!");
- return NULL;
- }
-
- /* restore loop state */
- pop_loop(A);
-
- return loop;
-}
-
-
-/**
- * Transform a do-while-loop so that continue statements are converted to breaks.
- * Then do normal IR code generation.
- *
- * Before:
- *
- * do {
- * A;
- * if (IFCOND)
- * continue;
- * B;
- * break;
- * C;
- * } while (LOOPCOND);
- *
- * After:
- *
- * {
- * bool _notBreakFlag = 1;
- * do {
- * do {
- * A;
- * if (IFCOND) {
- * break; // was continue
- * }
- * B;
- * _notBreakFlag = 0; // was
- * break; // break
- * C;
- * } while (0)
- * } while (_notBreakFlag && LOOPCOND);
- * }
- */
-static slang_ir_node *
-_slang_gen_do_without_continue(slang_assemble_ctx *A, slang_operation *oper)
-{
- slang_operation *top;
- slang_operation *innerBody;
-
- assert(oper->type == SLANG_OPER_DO);
-
- top = slang_operation_new(1);
- top->type = SLANG_OPER_BLOCK_NEW_SCOPE;
- top->locals->outer_scope = oper->locals->outer_scope;
- slang_operation_add_children(top, 2);
-
- /* declare: bool _notBreakFlag = true */
- {
- slang_operation *condDecl = slang_oper_child(top, 0);
- slang_generate_declaration(A, top->locals, condDecl,
- SLANG_SPEC_BOOL, "_notBreakFlag", GL_TRUE);
- }
-
- /* build outer do-loop: do { ... } while (_notBreakFlag && LOOPCOND) */
- {
- slang_operation *outerDo = slang_oper_child(top, 1);
- outerDo->type = SLANG_OPER_DO;
- slang_operation_add_children(outerDo, 2);
-
- /* inner do-loop */
- {
- slang_operation *innerDo = slang_oper_child(outerDo, 0);
- innerDo->type = SLANG_OPER_DO;
- slang_operation_add_children(innerDo, 2);
-
- /* copy original do-loop body into inner do-loop's body */
- innerBody = slang_oper_child(innerDo, 0);
- slang_operation_copy(innerBody, slang_oper_child(oper, 0));
- innerBody->locals->outer_scope = innerDo->locals;
-
- /* inner do-loop's condition is constant/false */
- {
- slang_operation *constFalse = slang_oper_child(innerDo, 1);
- slang_operation_literal_bool(constFalse, GL_FALSE);
- }
- }
-
- /* _notBreakFlag && LOOPCOND */
- {
- slang_operation *cond = slang_oper_child(outerDo, 1);
- cond->type = SLANG_OPER_LOGICALAND;
- slang_operation_add_children(cond, 2);
- {
- slang_operation *notBreak = slang_oper_child(cond, 0);
- slang_operation_identifier(notBreak, A, "_notBreakFlag");
- }
- {
- slang_operation *origCond = slang_oper_child(cond, 1);
- slang_operation_copy(origCond, slang_oper_child(oper, 1));
- }
- }
- }
-
- /* Finally, in innerBody,
- * replace "break" with "_notBreakFlag = 0; break"
- * replace "continue" with "break"
- */
- replace_break_and_cont(A, innerBody);
-
- /*slang_print_tree(top, 0);*/
-
- return _slang_gen_operation(A, top);
-}
-
-
-/**
- * Generate IR tree for a do-while loop using high-level LOOP, IF instructions.
- */
-static slang_ir_node *
-_slang_gen_do(slang_assemble_ctx * A, slang_operation *oper)
-{
- /*
- * LOOP:
- * body code (child[0])
- * tail code:
- * BREAK if !expr (child[1])
- */
- slang_ir_node *loop;
- GLboolean isConst, constTrue;
-
- if (!A->EmitContReturn) {
- /* We don't want to emit CONT instructions. If this do-loop has
- * a continue, translate it away.
- */
- if (_slang_loop_contains_continue(slang_oper_child(oper, 0))) {
- return _slang_gen_do_without_continue(A, oper);
- }
- }
-
- /* type-check expression */
- if (!_slang_is_boolean(A, &oper->children[1])) {
- slang_info_log_error(A->log, "scalar/boolean expression expected for 'do/while'");
- return NULL;
- }
-
- loop = new_loop(NULL);
-
- /* save loop state */
- push_loop(A, oper, loop);
-
- /* loop body: */
- loop->Children[0] = _slang_gen_operation(A, &oper->children[0]);
-
- /* Check if loop condition is a constant */
- isConst = _slang_is_constant_cond(&oper->children[1], &constTrue);
- if (isConst && constTrue) {
- /* do { } while(1) ==> no conditional break */
- loop->Children[1] = NULL; /* no tail code */
- }
- else {
- slang_ir_node *cond
- = new_cond(new_not(_slang_gen_operation(A, &oper->children[1])));
- loop->Children[1] = new_break_if_true(A, cond);
- }
-
- /* XXX we should do infinite loop detection, as above */
-
- /* restore loop state */
- pop_loop(A);
-
- return loop;
-}
-
-
-/**
- * Recursively count the number of operations rooted at 'oper'.
- * This gives some kind of indication of the size/complexity of an operation.
- */
-static GLuint
-sizeof_operation(const slang_operation *oper)
-{
- if (oper) {
- GLuint count = 1; /* me */
- GLuint i;
- for (i = 0; i < oper->num_children; i++) {
- count += sizeof_operation(&oper->children[i]);
- }
- return count;
- }
- else {
- return 0;
- }
-}
-
-
-/**
- * Determine if a for-loop can be unrolled.
- * At this time, only a rather narrow class of for loops can be unrolled.
- * See code for details.
- * When a loop can't be unrolled because it's too large we'll emit a
- * message to the log.
- */
-static GLboolean
-_slang_can_unroll_for_loop(slang_assemble_ctx * A, const slang_operation *oper)
-{
- GLuint bodySize;
- GLint start, end;
- const char *varName;
- slang_atom varId;
-
- if (oper->type != SLANG_OPER_FOR)
- return GL_FALSE;
-
- assert(oper->num_children == 4);
-
- if (_slang_loop_contains_continue_or_break(slang_oper_child_const(oper, 3)))
- return GL_FALSE;
-
- /* children[0] must be either "int i=constant" or "i=constant" */
- if (oper->children[0].type == SLANG_OPER_BLOCK_NO_NEW_SCOPE) {
- slang_variable *var;
-
- if (oper->children[0].children[0].type != SLANG_OPER_VARIABLE_DECL)
- return GL_FALSE;
-
- varId = oper->children[0].children[0].a_id;
-
- var = _slang_variable_locate(oper->children[0].children[0].locals,
- varId, GL_TRUE);
- if (!var)
- return GL_FALSE;
- if (!var->initializer)
- return GL_FALSE;
- if (var->initializer->type != SLANG_OPER_LITERAL_INT)
- return GL_FALSE;
- start = (GLint) var->initializer->literal[0];
- }
- else if (oper->children[0].type == SLANG_OPER_EXPRESSION) {
- if (oper->children[0].children[0].type != SLANG_OPER_ASSIGN)
- return GL_FALSE;
- if (oper->children[0].children[0].children[0].type != SLANG_OPER_IDENTIFIER)
- return GL_FALSE;
- if (oper->children[0].children[0].children[1].type != SLANG_OPER_LITERAL_INT)
- return GL_FALSE;
-
- varId = oper->children[0].children[0].children[0].a_id;
-
- start = (GLint) oper->children[0].children[0].children[1].literal[0];
- }
- else {
- return GL_FALSE;
- }
-
- /* children[1] must be "i<constant" */
- if (oper->children[1].type != SLANG_OPER_EXPRESSION)
- return GL_FALSE;
- if (oper->children[1].children[0].type != SLANG_OPER_LESS)
- return GL_FALSE;
- if (oper->children[1].children[0].children[0].type != SLANG_OPER_IDENTIFIER)
- return GL_FALSE;
- if (oper->children[1].children[0].children[1].type != SLANG_OPER_LITERAL_INT)
- return GL_FALSE;
-
- end = (GLint) oper->children[1].children[0].children[1].literal[0];
-
- /* children[2] must be "i++" or "++i" */
- if (oper->children[2].type != SLANG_OPER_POSTINCREMENT &&
- oper->children[2].type != SLANG_OPER_PREINCREMENT)
- return GL_FALSE;
- if (oper->children[2].children[0].type != SLANG_OPER_IDENTIFIER)
- return GL_FALSE;
-
- /* make sure the same variable name is used in all places */
- if ((oper->children[1].children[0].children[0].a_id != varId) ||
- (oper->children[2].children[0].a_id != varId))
- return GL_FALSE;
-
- varName = (const char *) varId;
-
- /* children[3], the loop body, can't be too large */
- bodySize = sizeof_operation(&oper->children[3]);
- if (bodySize > MAX_FOR_LOOP_UNROLL_BODY_SIZE) {
- slang_info_log_print(A->log,
- "Note: 'for (%s ... )' body is too large/complex"
- " to unroll",
- varName);
- return GL_FALSE;
- }
-
- if (start >= end)
- return GL_FALSE; /* degenerate case */
-
- if ((GLuint)(end - start) > MAX_FOR_LOOP_UNROLL_ITERATIONS) {
- slang_info_log_print(A->log,
- "Note: 'for (%s=%d; %s<%d; ++%s)' is too"
- " many iterations to unroll",
- varName, start, varName, end, varName);
- return GL_FALSE;
- }
-
- if ((end - start) * bodySize > MAX_FOR_LOOP_UNROLL_COMPLEXITY) {
- slang_info_log_print(A->log,
- "Note: 'for (%s=%d; %s<%d; ++%s)' will generate"
- " too much code to unroll",
- varName, start, varName, end, varName);
- return GL_FALSE;
- }
-
- return GL_TRUE; /* we can unroll the loop */
-}
-
-
-/**
- * Unroll a for-loop.
- * First we determine the number of iterations to unroll.
- * Then for each iteration:
- * make a copy of the loop body
- * replace instances of the loop variable with the current iteration value
- * generate IR code for the body
- * \return pointer to generated IR code or NULL if error, out of memory, etc.
- */
-static slang_ir_node *
-_slang_unroll_for_loop(slang_assemble_ctx * A, const slang_operation *oper)
-{
- GLint start, end, iter;
- slang_ir_node *n, *root = NULL;
- slang_atom varId;
-
- if (oper->children[0].type == SLANG_OPER_BLOCK_NO_NEW_SCOPE) {
- /* for (int i=0; ... */
- slang_variable *var;
-
- varId = oper->children[0].children[0].a_id;
- var = _slang_variable_locate(oper->children[0].children[0].locals,
- varId, GL_TRUE);
- assert(var);
- start = (GLint) var->initializer->literal[0];
- }
- else {
- /* for (i=0; ... */
- varId = oper->children[0].children[0].children[0].a_id;
- start = (GLint) oper->children[0].children[0].children[1].literal[0];
- }
-
- end = (GLint) oper->children[1].children[0].children[1].literal[0];
-
- for (iter = start; iter < end; iter++) {
- slang_operation *body;
-
- /* make a copy of the loop body */
- body = slang_operation_new(1);
- if (!body)
- return NULL;
-
- if (!slang_operation_copy(body, &oper->children[3]))
- return NULL;
-
- /* in body, replace instances of 'varId' with literal 'iter' */
- {
- slang_variable *oldVar;
- slang_operation *newOper;
-
- oldVar = _slang_variable_locate(oper->locals, varId, GL_TRUE);
- if (!oldVar) {
- /* undeclared loop variable */
- slang_operation_delete(body);
- return NULL;
- }
-
- newOper = slang_operation_new(1);
- newOper->type = SLANG_OPER_LITERAL_INT;
- newOper->literal_size = 1;
- newOper->literal[0] = (GLfloat) iter;
-
- /* replace instances of the loop variable with newOper */
- slang_substitute(A, body, 1, &oldVar, &newOper, GL_FALSE);
- }
-
- /* do IR codegen for body */
- n = _slang_gen_operation(A, body);
- if (!n)
- return NULL;
-
- root = new_seq(root, n);
-
- slang_operation_delete(body);
- }
-
- return root;
-}
-
-
-/**
- * Replace 'continue' statement with 'break' inside a for-loop.
- * This is a recursive helper function used by _slang_gen_for_without_continue().
- */
-static void
-replace_continue_with_break(slang_assemble_ctx *A, slang_operation *oper)
-{
- switch (oper->type) {
- case SLANG_OPER_CONTINUE:
- oper->type = SLANG_OPER_BREAK;
- break;
- case SLANG_OPER_FOR:
- case SLANG_OPER_DO:
- case SLANG_OPER_WHILE:
- /* stop upon finding a nested loop */
- break;
- default:
- /* recurse */
- {
- GLuint i;
- for (i = 0; i < oper->num_children; i++) {
- replace_continue_with_break(A, slang_oper_child(oper, i));
- }
- }
- }
-}
-
-
-/**
- * Transform a for-loop so that continue statements are converted to breaks.
- * Then do normal IR code generation.
- *
- * Before:
- *
- * for (INIT; LOOPCOND; INCR) {
- * A;
- * if (IFCOND) {
- * continue;
- * }
- * B;
- * }
- *
- * After:
- *
- * {
- * bool _condFlag = 1;
- * for (INIT; _condFlag; ) {
- * for ( ; _condFlag = LOOPCOND; INCR) {
- * A;
- * if (IFCOND) {
- * break;
- * }
- * B;
- * }
- * if (_condFlag)
- * INCR;
- * }
- * }
- */
-static slang_ir_node *
-_slang_gen_for_without_continue(slang_assemble_ctx *A, slang_operation *oper)
-{
- slang_operation *top;
- slang_operation *outerFor, *innerFor, *init, *cond, *incr;
- slang_operation *lhs, *rhs;
-
- assert(oper->type == SLANG_OPER_FOR);
-
- top = slang_operation_new(1);
- top->type = SLANG_OPER_BLOCK_NEW_SCOPE;
- top->locals->outer_scope = oper->locals->outer_scope;
- slang_operation_add_children(top, 2);
-
- /* declare: bool _condFlag = true */
- {
- slang_operation *condDecl = slang_oper_child(top, 0);
- slang_generate_declaration(A, top->locals, condDecl,
- SLANG_SPEC_BOOL, "_condFlag", GL_TRUE);
- }
-
- /* build outer loop: for (INIT; _condFlag; ) { */
- outerFor = slang_oper_child(top, 1);
- outerFor->type = SLANG_OPER_FOR;
- slang_operation_add_children(outerFor, 4);
-
- init = slang_oper_child(outerFor, 0);
- slang_operation_copy(init, slang_oper_child(oper, 0));
-
- cond = slang_oper_child(outerFor, 1);
- cond->type = SLANG_OPER_IDENTIFIER;
- cond->a_id = slang_atom_pool_atom(A->atoms, "_condFlag");
-
- incr = slang_oper_child(outerFor, 2);
- incr->type = SLANG_OPER_VOID;
-
- /* body of the outer loop */
- {
- slang_operation *block = slang_oper_child(outerFor, 3);
-
- slang_operation_add_children(block, 2);
- block->type = SLANG_OPER_BLOCK_NO_NEW_SCOPE;
-
- /* build inner loop: for ( ; _condFlag = LOOPCOND; INCR) { */
- {
- innerFor = slang_oper_child(block, 0);
-
- /* make copy of orig loop */
- slang_operation_copy(innerFor, oper);
- assert(innerFor->type == SLANG_OPER_FOR);
- innerFor->locals->outer_scope = block->locals;
-
- init = slang_oper_child(innerFor, 0);
- init->type = SLANG_OPER_VOID; /* leak? */
-
- cond = slang_oper_child(innerFor, 1);
- slang_operation_destruct(cond);
- cond->type = SLANG_OPER_ASSIGN;
- cond->locals = _slang_variable_scope_new(innerFor->locals);
- slang_operation_add_children(cond, 2);
-
- lhs = slang_oper_child(cond, 0);
- lhs->type = SLANG_OPER_IDENTIFIER;
- lhs->a_id = slang_atom_pool_atom(A->atoms, "_condFlag");
-
- rhs = slang_oper_child(cond, 1);
- slang_operation_copy(rhs, slang_oper_child(oper, 1));
- }
-
- /* if (_condFlag) INCR; */
- {
- slang_operation *ifop = slang_oper_child(block, 1);
- ifop->type = SLANG_OPER_IF;
- slang_operation_add_children(ifop, 2);
-
- /* re-use cond node build above */
- slang_operation_copy(slang_oper_child(ifop, 0), cond);
-
- /* incr node from original for-loop operation */
- slang_operation_copy(slang_oper_child(ifop, 1),
- slang_oper_child(oper, 2));
- }
-
- /* finally, replace "continue" with "break" in the inner for-loop */
- replace_continue_with_break(A, slang_oper_child(innerFor, 3));
- }
-
- return _slang_gen_operation(A, top);
-}
-
-
-
-/**
- * Generate IR for a for-loop. Unrolling will be done when possible.
- */
-static slang_ir_node *
-_slang_gen_for(slang_assemble_ctx * A, slang_operation *oper)
-{
- GLboolean unroll;
-
- if (!A->EmitContReturn) {
- /* We don't want to emit CONT instructions. If this for-loop has
- * a continue, translate it away.
- */
- if (_slang_loop_contains_continue(slang_oper_child(oper, 3))) {
- return _slang_gen_for_without_continue(A, oper);
- }
- }
-
- unroll = _slang_can_unroll_for_loop(A, oper);
- if (unroll) {
- slang_ir_node *code = _slang_unroll_for_loop(A, oper);
- if (code)
- return code;
- }
-
- assert(oper->type == SLANG_OPER_FOR);
-
- /* conventional for-loop code generation */
- {
- /*
- * init code (child[0])
- * LOOP:
- * BREAK if !expr (child[1])
- * body code (child[3])
- * tail code:
- * incr code (child[2]) // XXX continue here
- */
- slang_ir_node *loop, *cond, *breakIf, *body, *init, *incr;
- init = _slang_gen_operation(A, &oper->children[0]);
- loop = new_loop(NULL);
-
- /* save loop state */
- push_loop(A, oper, loop);
-
- cond = new_cond(new_not(_slang_gen_operation(A, &oper->children[1])));
- breakIf = new_break_if_true(A, cond);
- body = _slang_gen_operation(A, &oper->children[3]);
- incr = _slang_gen_operation(A, &oper->children[2]);
-
- loop->Children[0] = new_seq(breakIf, body);
- loop->Children[1] = incr; /* tail code */
-
- /* restore loop state */
- pop_loop(A);
-
- return new_seq(init, loop);
- }
-}
-
-
-static slang_ir_node *
-_slang_gen_continue(slang_assemble_ctx * A, const slang_operation *oper)
-{
- slang_ir_node *n, *cont, *incr = NULL, *loopNode;
-
- assert(oper->type == SLANG_OPER_CONTINUE);
- loopNode = current_loop_ir(A);
- assert(loopNode);
- assert(loopNode->Opcode == IR_LOOP);
-
- cont = new_node0(IR_CONT);
- if (cont) {
- cont->Parent = loopNode;
- /* insert this node at head of linked list of cont/break instructions */
- cont->List = loopNode->List;
- loopNode->List = cont;
- }
-
- n = new_seq(incr, cont);
- return n;
-}
-
-
-/**
- * Determine if the given operation is of a specific type.
- */
-static GLboolean
-is_operation_type(const slang_operation *oper, slang_operation_type type)
-{
- if (oper->type == type)
- return GL_TRUE;
- else if ((oper->type == SLANG_OPER_BLOCK_NEW_SCOPE ||
- oper->type == SLANG_OPER_BLOCK_NO_NEW_SCOPE) &&
- oper->num_children == 1)
- return is_operation_type(&oper->children[0], type);
- else
- return GL_FALSE;
-}
-
-
-/**
- * Generate IR tree for an if/then/else conditional using high-level
- * IR_IF instruction.
- */
-static slang_ir_node *
-_slang_gen_if(slang_assemble_ctx * A, const slang_operation *oper)
-{
- /*
- * eval expr (child[0])
- * IF expr THEN
- * if-body code
- * ELSE
- * else-body code
- * ENDIF
- */
- const GLboolean haveElseClause = !_slang_is_noop(&oper->children[2]);
- slang_ir_node *ifNode, *cond, *ifBody, *elseBody;
- GLboolean isConst, constTrue;
-
- /* type-check expression */
- if (!_slang_is_boolean(A, &oper->children[0])) {
- slang_info_log_error(A->log, "boolean expression expected for 'if'");
- return NULL;
- }
-
- if (!_slang_is_scalar_or_boolean(A, &oper->children[0])) {
- slang_info_log_error(A->log, "scalar/boolean expression expected for 'if'");
- return NULL;
- }
-
- isConst = _slang_is_constant_cond(&oper->children[0], &constTrue);
- if (isConst) {
- if (constTrue) {
- /* if (true) ... */
- return _slang_gen_operation(A, &oper->children[1]);
- }
- else {
- /* if (false) ... */
- return _slang_gen_operation(A, &oper->children[2]);
- }
- }
-
- cond = _slang_gen_operation(A, &oper->children[0]);
- cond = new_cond(cond);
-
- if (is_operation_type(&oper->children[1], SLANG_OPER_BREAK)
- && !haveElseClause) {
- /* Special case: generate a conditional break */
- ifBody = new_break_if_true(A, cond);
- return ifBody;
- }
- else if (is_operation_type(&oper->children[1], SLANG_OPER_CONTINUE)
- && !haveElseClause
- && current_loop_oper(A)
- && current_loop_oper(A)->type != SLANG_OPER_FOR) {
- /* Special case: generate a conditional continue */
- ifBody = new_cont_if_true(A, cond);
- return ifBody;
- }
- else {
- /* general case */
- ifBody = _slang_gen_operation(A, &oper->children[1]);
- if (haveElseClause)
- elseBody = _slang_gen_operation(A, &oper->children[2]);
- else
- elseBody = NULL;
- ifNode = new_if(cond, ifBody, elseBody);
- return ifNode;
- }
-}
-
-
-
-static slang_ir_node *
-_slang_gen_not(slang_assemble_ctx * A, const slang_operation *oper)
-{
- slang_ir_node *n;
-
- assert(oper->type == SLANG_OPER_NOT);
-
- /* type-check expression */
- if (!_slang_is_scalar_or_boolean(A, &oper->children[0])) {
- slang_info_log_error(A->log,
- "scalar/boolean expression expected for '!'");
- return NULL;
- }
-
- n = _slang_gen_operation(A, &oper->children[0]);
- if (n)
- return new_not(n);
- else
- return NULL;
-}
-
-
-static slang_ir_node *
-_slang_gen_xor(slang_assemble_ctx * A, const slang_operation *oper)
-{
- slang_ir_node *n1, *n2;
-
- assert(oper->type == SLANG_OPER_LOGICALXOR);
-
- if (!_slang_is_scalar_or_boolean(A, &oper->children[0]) ||
- !_slang_is_scalar_or_boolean(A, &oper->children[0])) {
- slang_info_log_error(A->log,
- "scalar/boolean expressions expected for '^^'");
- return NULL;
- }
-
- n1 = _slang_gen_operation(A, &oper->children[0]);
- if (!n1)
- return NULL;
- n2 = _slang_gen_operation(A, &oper->children[1]);
- if (!n2)
- return NULL;
- return new_node2(IR_NOTEQUAL, n1, n2);
-}
-
-
-/**
- * Generate IR node for storage of a temporary of given size.
- */
-static slang_ir_node *
-_slang_gen_temporary(GLint size)
-{
- slang_ir_storage *store;
- slang_ir_node *n = NULL;
-
- store = _slang_new_ir_storage(PROGRAM_TEMPORARY, -2, size);
- if (store) {
- n = new_node0(IR_VAR_DECL);
- if (n) {
- n->Store = store;
- }
- else {
- _slang_free(store);
- }
- }
- return n;
-}
-
-
-/**
- * Generate program constants for an array.
- * Ex: const vec2[3] v = vec2[3](vec2(1,1), vec2(2,2), vec2(3,3));
- * This will allocate and initialize three vector constants, storing
- * the array in constant memory, not temporaries like a non-const array.
- * This can also be used for uniform array initializers.
- * \return GL_TRUE for success, GL_FALSE if failure (semantic error, etc).
- */
-static GLboolean
-make_constant_array(slang_assemble_ctx *A,
- slang_variable *var,
- slang_operation *initializer)
-{
- struct gl_program *prog = A->program;
- const GLenum datatype = _slang_gltype_from_specifier(&var->type.specifier);
- const char *varName = (char *) var->a_name;
- const GLuint numElements = initializer->num_children;
- GLint size;
- GLuint i, j;
- GLfloat *values;
-
- if (!var->store) {
- var->store = _slang_new_ir_storage(PROGRAM_UNDEFINED, -6, -6);
- }
- size = var->store->Size;
-
- assert(var->type.qualifier == SLANG_QUAL_CONST ||
- var->type.qualifier == SLANG_QUAL_UNIFORM);
- assert(initializer->type == SLANG_OPER_CALL);
- assert(initializer->array_constructor);
-
- values = (GLfloat *) malloc(numElements * 4 * sizeof(GLfloat));
-
- /* convert constructor params into ordinary floats */
- for (i = 0; i < numElements; i++) {
- const slang_operation *op = &initializer->children[i];
- if (op->type != SLANG_OPER_LITERAL_FLOAT) {
- /* unsupported type for this optimization */
- free(values);
- return GL_FALSE;
- }
- for (j = 0; j < op->literal_size; j++) {
- values[i * 4 + j] = op->literal[j];
- }
- for ( ; j < 4; j++) {
- values[i * 4 + j] = 0.0f;
- }
- }
-
- /* slightly different paths for constants vs. uniforms */
- if (var->type.qualifier == SLANG_QUAL_UNIFORM) {
- var->store->File = PROGRAM_UNIFORM;
- var->store->Index = _mesa_add_uniform(prog->Parameters, varName,
- size, datatype, values);
- }
- else {
- var->store->File = PROGRAM_CONSTANT;
- var->store->Index = _mesa_add_named_constant(prog->Parameters, varName,
- values, size);
- }
- assert(var->store->Size == size);
-
- free(values);
-
- return GL_TRUE;
-}
-
-
-
-/**
- * Generate IR node for allocating/declaring a variable (either a local or
- * a global).
- * Generally, this involves allocating an slang_ir_storage instance for the
- * variable, choosing a register file (temporary, constant, etc).
- * For ordinary variables we do not yet allocate storage though. We do that
- * when we find the first actual use of the variable to avoid allocating temp
- * regs that will never get used.
- * At this time, uniforms are always allocated space in this function.
- *
- * \param initializer Optional initializer expression for the variable.
- */
-static slang_ir_node *
-_slang_gen_var_decl(slang_assemble_ctx *A, slang_variable *var,
- slang_operation *initializer)
-{
- const char *varName = (const char *) var->a_name;
- const GLenum datatype = _slang_gltype_from_specifier(&var->type.specifier);
- slang_ir_node *varDecl, *n;
- slang_ir_storage *store;
- GLint arrayLen, size, totalSize; /* if array then totalSize > size */
- gl_register_file file;
-
- /*assert(!var->declared);*/
- var->declared = GL_TRUE;
-
- /* determine GPU register file for simple cases */
- if (is_sampler_type(&var->type)) {
- file = PROGRAM_SAMPLER;
- }
- else if (var->type.qualifier == SLANG_QUAL_UNIFORM) {
- file = PROGRAM_UNIFORM;
- }
- else {
- file = PROGRAM_TEMPORARY;
- }
-
- size = _slang_sizeof_type_specifier(&var->type.specifier);
- if (size <= 0) {
- slang_info_log_error(A->log, "invalid declaration for '%s'", varName);
- return NULL;
- }
-
- arrayLen = _slang_array_length(var);
- totalSize = _slang_array_size(size, arrayLen);
-
- /* Allocate IR node for the declaration */
- varDecl = new_node0(IR_VAR_DECL);
- if (!varDecl)
- return NULL;
-
- /* Allocate slang_ir_storage for this variable if needed.
- * Note that we may not actually allocate a constant or temporary register
- * until later.
- */
- if (!var->store) {
- GLint index = -7; /* TBD / unknown */
- var->store = _slang_new_ir_storage(file, index, totalSize);
- if (!var->store)
- return NULL; /* out of memory */
- }
-
- /* set the IR node's Var and Store pointers */
- varDecl->Var = var;
- varDecl->Store = var->store;
-
-
- store = var->store;
-
- /* if there's an initializer, generate IR for the expression */
- if (initializer) {
- slang_ir_node *varRef, *init;
-
- if (var->type.qualifier == SLANG_QUAL_CONST) {
- /* if the variable is const, the initializer must be a const
- * expression as well.
- */
-#if 0
- if (!_slang_is_constant_expr(initializer)) {
- slang_info_log_error(A->log,
- "initializer for %s not constant", varName);
- return NULL;
- }
-#endif
- }
-
- if (var->type.qualifier == SLANG_QUAL_UNIFORM &&
- !A->allow_uniform_initializers) {
- slang_info_log_error(A->log,
- "initializer for uniform %s not allowed",
- varName);
- return NULL;
- }
-
- /* IR for the variable we're initializing */
- varRef = new_var(A, var);
- if (!varRef) {
- slang_info_log_error(A->log, "out of memory");
- return NULL;
- }
-
- /* constant-folding, etc here */
- _slang_simplify(initializer, &A->space, A->atoms);
-
- /* look for simple constant-valued variables and uniforms */
- if (var->type.qualifier == SLANG_QUAL_CONST ||
- var->type.qualifier == SLANG_QUAL_UNIFORM) {
-
- if (initializer->type == SLANG_OPER_CALL &&
- initializer->array_constructor) {
- /* array initializer */
- if (make_constant_array(A, var, initializer))
- return varRef;
- }
- else if (initializer->type == SLANG_OPER_LITERAL_FLOAT ||
- initializer->type == SLANG_OPER_LITERAL_INT) {
- /* simple float/vector initializer */
- if (store->File == PROGRAM_UNIFORM) {
- store->Index = _mesa_add_uniform(A->program->Parameters,
- varName,
- totalSize, datatype,
- initializer->literal);
- store->Swizzle = _slang_var_swizzle(size, 0);
- return varRef;
- }
-#if 0
- else {
- store->File = PROGRAM_CONSTANT;
- store->Index = _mesa_add_named_constant(A->program->Parameters,
- varName,
- initializer->literal,
- totalSize);
- store->Swizzle = _slang_var_swizzle(size, 0);
- return varRef;
- }
-#endif
- }
- }
-
- /* IR for initializer */
- init = _slang_gen_operation(A, initializer);
- if (!init)
- return NULL;
-
- /* XXX remove this when type checking is added above */
- if (init->Store && init->Store->Size != totalSize) {
- slang_info_log_error(A->log, "invalid assignment (wrong types)");
- return NULL;
- }
-
- /* assign RHS to LHS */
- n = new_node2(IR_COPY, varRef, init);
- n = new_seq(varDecl, n);
- }
- else {
- /* no initializer */
- n = varDecl;
- }
-
- if (store->File == PROGRAM_UNIFORM && store->Index < 0) {
- /* always need to allocate storage for uniforms at this point */
- store->Index = _mesa_add_uniform(A->program->Parameters, varName,
- totalSize, datatype, NULL);
- store->Swizzle = _slang_var_swizzle(size, 0);
- }
-
-#if 0
- printf("%s var %p %s store=%p index=%d size=%d\n",
- __FUNCTION__, (void *) var, (char *) varName,
- (void *) store, store->Index, store->Size);
-#endif
-
- return n;
-}
-
-
-/**
- * Generate code for a selection expression: b ? x : y
- * XXX In some cases we could implement a selection expression
- * with an LRP instruction (use the boolean as the interpolant).
- * Otherwise, we use an IF/ELSE/ENDIF construct.
- */
-static slang_ir_node *
-_slang_gen_select(slang_assemble_ctx *A, slang_operation *oper)
-{
- slang_ir_node *cond, *ifNode, *trueExpr, *falseExpr, *trueNode, *falseNode;
- slang_ir_node *tmpDecl, *tmpVar, *tree;
- slang_typeinfo type0, type1, type2;
- int size, isBool, isEqual;
-
- assert(oper->type == SLANG_OPER_SELECT);
- assert(oper->num_children == 3);
-
- /* type of children[0] must be boolean */
- slang_typeinfo_construct(&type0);
- typeof_operation(A, &oper->children[0], &type0);
- isBool = (type0.spec.type == SLANG_SPEC_BOOL);
- slang_typeinfo_destruct(&type0);
- if (!isBool) {
- slang_info_log_error(A->log, "selector type is not boolean");
- return NULL;
- }
-
- slang_typeinfo_construct(&type1);
- slang_typeinfo_construct(&type2);
- typeof_operation(A, &oper->children[1], &type1);
- typeof_operation(A, &oper->children[2], &type2);
- isEqual = slang_type_specifier_equal(&type1.spec, &type2.spec);
- slang_typeinfo_destruct(&type1);
- slang_typeinfo_destruct(&type2);
- if (!isEqual) {
- slang_info_log_error(A->log, "incompatible types for ?: operator");
- return NULL;
- }
-
- /* size of x or y's type */
- size = _slang_sizeof_type_specifier(&type1.spec);
- assert(size > 0);
-
- /* temporary var */
- tmpDecl = _slang_gen_temporary(size);
-
- /* the condition (child 0) */
- cond = _slang_gen_operation(A, &oper->children[0]);
- cond = new_cond(cond);
-
- /* if-true body (child 1) */
- tmpVar = new_node0(IR_VAR);
- tmpVar->Store = tmpDecl->Store;
- trueExpr = _slang_gen_operation(A, &oper->children[1]);
- trueNode = new_node2(IR_COPY, tmpVar, trueExpr);
-
- /* if-false body (child 2) */
- tmpVar = new_node0(IR_VAR);
- tmpVar->Store = tmpDecl->Store;
- falseExpr = _slang_gen_operation(A, &oper->children[2]);
- falseNode = new_node2(IR_COPY, tmpVar, falseExpr);
-
- ifNode = new_if(cond, trueNode, falseNode);
-
- /* tmp var value */
- tmpVar = new_node0(IR_VAR);
- tmpVar->Store = tmpDecl->Store;
-
- tree = new_seq(ifNode, tmpVar);
- tree = new_seq(tmpDecl, tree);
-
- /*_slang_print_ir_tree(tree, 10);*/
- return tree;
-}
-
-
-/**
- * Generate code for &&.
- */
-static slang_ir_node *
-_slang_gen_logical_and(slang_assemble_ctx *A, slang_operation *oper)
-{
- /* rewrite "a && b" as "a ? b : false" */
- slang_operation *select;
- slang_ir_node *n;
-
- select = slang_operation_new(1);
- select->type = SLANG_OPER_SELECT;
- slang_operation_add_children(select, 3);
-
- slang_operation_copy(slang_oper_child(select, 0), &oper->children[0]);
- slang_operation_copy(slang_oper_child(select, 1), &oper->children[1]);
- slang_operation_literal_bool(slang_oper_child(select, 2), GL_FALSE);
-
- n = _slang_gen_select(A, select);
- return n;
-}
-
-
-/**
- * Generate code for ||.
- */
-static slang_ir_node *
-_slang_gen_logical_or(slang_assemble_ctx *A, slang_operation *oper)
-{
- /* rewrite "a || b" as "a ? true : b" */
- slang_operation *select;
- slang_ir_node *n;
-
- select = slang_operation_new(1);
- select->type = SLANG_OPER_SELECT;
- slang_operation_add_children(select, 3);
-
- slang_operation_copy(slang_oper_child(select, 0), &oper->children[0]);
- slang_operation_literal_bool(slang_oper_child(select, 1), GL_TRUE);
- slang_operation_copy(slang_oper_child(select, 2), &oper->children[1]);
-
- n = _slang_gen_select(A, select);
- return n;
-}
-
-
-/**
- * Generate IR tree for a return statement.
- */
-static slang_ir_node *
-_slang_gen_return(slang_assemble_ctx * A, slang_operation *oper)
-{
- assert(oper->type == SLANG_OPER_RETURN);
- return new_return(A->curFuncEndLabel);
-}
-
-
-#if 0
-/**
- * Determine if the given operation/expression is const-valued.
- */
-static GLboolean
-_slang_is_constant_expr(const slang_operation *oper)
-{
- slang_variable *var;
- GLuint i;
-
- switch (oper->type) {
- case SLANG_OPER_IDENTIFIER:
- var = _slang_variable_locate(oper->locals, oper->a_id, GL_TRUE);
- if (var && var->type.qualifier == SLANG_QUAL_CONST)
- return GL_TRUE;
- return GL_FALSE;
- default:
- for (i = 0; i < oper->num_children; i++) {
- if (!_slang_is_constant_expr(&oper->children[i]))
- return GL_FALSE;
- }
- return GL_TRUE;
- }
-}
-#endif
-
-
-/**
- * Check if an assignment of type t1 to t0 is legal.
- * XXX more cases needed.
- */
-static GLboolean
-_slang_assignment_compatible(slang_assemble_ctx *A,
- slang_operation *op0,
- slang_operation *op1)
-{
- slang_typeinfo t0, t1;
- GLuint sz0, sz1;
-
- if (op0->type == SLANG_OPER_POSTINCREMENT ||
- op0->type == SLANG_OPER_POSTDECREMENT) {
- return GL_FALSE;
- }
-
- slang_typeinfo_construct(&t0);
- typeof_operation(A, op0, &t0);
-
- slang_typeinfo_construct(&t1);
- typeof_operation(A, op1, &t1);
-
- sz0 = _slang_sizeof_type_specifier(&t0.spec);
- sz1 = _slang_sizeof_type_specifier(&t1.spec);
-
-#if 1
- if (sz0 != sz1) {
- /*printf("assignment size mismatch %u vs %u\n", sz0, sz1);*/
- return GL_FALSE;
- }
-#endif
-
- if (t0.spec.type == SLANG_SPEC_STRUCT &&
- t1.spec.type == SLANG_SPEC_STRUCT &&
- t0.spec._struct->a_name != t1.spec._struct->a_name)
- return GL_FALSE;
-
- if (t0.spec.type == SLANG_SPEC_FLOAT &&
- t1.spec.type == SLANG_SPEC_BOOL)
- return GL_FALSE;
-
-#if 0 /* not used just yet - causes problems elsewhere */
- if (t0.spec.type == SLANG_SPEC_INT &&
- t1.spec.type == SLANG_SPEC_FLOAT)
- return GL_FALSE;
-#endif
-
- if (t0.spec.type == SLANG_SPEC_BOOL &&
- t1.spec.type == SLANG_SPEC_FLOAT)
- return GL_FALSE;
-
- if (t0.spec.type == SLANG_SPEC_BOOL &&
- t1.spec.type == SLANG_SPEC_INT)
- return GL_FALSE;
-
- return GL_TRUE;
-}
-
-
-/**
- * Generate IR tree for a local variable declaration.
- * Basically do some error checking and call _slang_gen_var_decl().
- */
-static slang_ir_node *
-_slang_gen_declaration(slang_assemble_ctx *A, slang_operation *oper)
-{
- const char *varName = (char *) oper->a_id;
- slang_variable *var;
- slang_ir_node *varDecl;
- slang_operation *initializer;
-
- assert(oper->type == SLANG_OPER_VARIABLE_DECL);
- assert(oper->num_children <= 1);
-
-
- /* lookup the variable by name */
- var = _slang_variable_locate(oper->locals, oper->a_id, GL_TRUE);
- if (!var)
- return NULL; /* "shouldn't happen" */
-
- if (var->type.qualifier == SLANG_QUAL_ATTRIBUTE ||
- var->type.qualifier == SLANG_QUAL_VARYING ||
- var->type.qualifier == SLANG_QUAL_UNIFORM) {
- /* can't declare attribute/uniform vars inside functions */
- slang_info_log_error(A->log,
- "local variable '%s' cannot be an attribute/uniform/varying",
- varName);
- return NULL;
- }
-
-#if 0
- if (v->declared) {
- slang_info_log_error(A->log, "variable '%s' redeclared", varName);
- return NULL;
- }
-#endif
-
- /* check if the var has an initializer */
- if (oper->num_children > 0) {
- assert(oper->num_children == 1);
- initializer = &oper->children[0];
- }
- else if (var->initializer) {
- initializer = var->initializer;
- }
- else {
- initializer = NULL;
- }
-
- if (initializer) {
- /* check/compare var type and initializer type */
- if (!_slang_assignment_compatible(A, oper, initializer)) {
- slang_info_log_error(A->log, "incompatible types in assignment");
- return NULL;
- }
- }
- else {
- if (var->type.qualifier == SLANG_QUAL_CONST) {
- slang_info_log_error(A->log,
- "const-qualified variable '%s' requires initializer",
- varName);
- return NULL;
- }
- }
-
- /* Generate IR node */
- varDecl = _slang_gen_var_decl(A, var, initializer);
- if (!varDecl)
- return NULL;
-
- return varDecl;
-}
-
-
-/**
- * Generate IR tree for a reference to a variable (such as in an expression).
- * This is different from a variable declaration.
- */
-static slang_ir_node *
-_slang_gen_variable(slang_assemble_ctx * A, slang_operation *oper)
-{
- /* If there's a variable associated with this oper (from inlining)
- * use it. Otherwise, use the oper's var id.
- */
- slang_atom name = oper->var ? oper->var->a_name : oper->a_id;
- slang_variable *var = _slang_variable_locate(oper->locals, name, GL_TRUE);
- slang_ir_node *n;
- if (!var || !var->declared) {
- slang_info_log_error(A->log, "undefined variable '%s'", (char *) name);
- return NULL;
- }
- n = new_var(A, var);
- return n;
-}
-
-
-
-/**
- * Return the number of components actually named by the swizzle.
- * Recall that swizzles may have undefined/don't-care values.
- */
-static GLuint
-swizzle_size(GLuint swizzle)
-{
- GLuint size = 0, i;
- for (i = 0; i < 4; i++) {
- GLuint swz = GET_SWZ(swizzle, i);
- size += (swz <= 3);
- }
- return size;
-}
-
-
-static slang_ir_node *
-_slang_gen_swizzle(slang_ir_node *child, GLuint swizzle)
-{
- slang_ir_node *n = new_node1(IR_SWIZZLE, child);
- assert(child);
- if (n) {
- assert(!n->Store);
- n->Store = _slang_new_ir_storage_relative(0,
- swizzle_size(swizzle),
- child->Store);
- assert(n->Store);
- n->Store->Swizzle = swizzle;
- }
- return n;
-}
-
-
-static GLboolean
-is_store_writable(const slang_assemble_ctx *A, const slang_ir_storage *store)
-{
- while (store->Parent)
- store = store->Parent;
-
- if (!(store->File == PROGRAM_OUTPUT ||
- store->File == PROGRAM_TEMPORARY ||
- (store->File == PROGRAM_VARYING &&
- A->program->Target == GL_VERTEX_PROGRAM_ARB))) {
- return GL_FALSE;
- }
- else {
- return GL_TRUE;
- }
-}
-
-
-/**
- * Walk up an IR storage path to compute the final swizzle.
- * This is used when we find an expression such as "foo.xz.yx".
- */
-static GLuint
-root_swizzle(const slang_ir_storage *st)
-{
- GLuint swizzle = st->Swizzle;
- while (st->Parent) {
- st = st->Parent;
- swizzle = _slang_swizzle_swizzle(st->Swizzle, swizzle);
- }
- return swizzle;
-}
-
-
-/**
- * Generate IR tree for an assignment (=).
- */
-static slang_ir_node *
-_slang_gen_assignment(slang_assemble_ctx * A, slang_operation *oper)
-{
- slang_operation *pred = NULL;
- slang_ir_node *n = NULL;
-
- if (oper->children[0].type == SLANG_OPER_IDENTIFIER) {
- /* Check that var is writeable */
- const char *varName = (char *) oper->children[0].a_id;
- slang_variable *var
- = _slang_variable_locate(oper->children[0].locals,
- oper->children[0].a_id, GL_TRUE);
- if (!var) {
- slang_info_log_error(A->log, "undefined variable '%s'", varName);
- return NULL;
- }
-
- if (var->type.qualifier == SLANG_QUAL_CONST ||
- var->type.qualifier == SLANG_QUAL_ATTRIBUTE ||
- var->type.qualifier == SLANG_QUAL_UNIFORM ||
- (var->type.qualifier == SLANG_QUAL_VARYING &&
- A->program->Target == GL_FRAGMENT_PROGRAM_ARB)) {
- slang_info_log_error(A->log,
- "illegal assignment to read-only variable '%s'",
- varName);
- return NULL;
- }
-
- /* check if we need to predicate this assignment based on __notRetFlag */
- if ((var->is_global ||
- var->type.qualifier == SLANG_QUAL_OUT ||
- var->type.qualifier == SLANG_QUAL_INOUT) && A->UseReturnFlag) {
- /* create predicate, used below */
- pred = slang_operation_new(1);
- pred->type = SLANG_OPER_IDENTIFIER;
- pred->a_id = slang_atom_pool_atom(A->atoms, "__notRetFlag");
- pred->locals->outer_scope = oper->locals->outer_scope;
- }
- }
-
- if (oper->children[0].type == SLANG_OPER_IDENTIFIER &&
- oper->children[1].type == SLANG_OPER_CALL) {
- /* Special case of: x = f(a, b)
- * Replace with f(a, b, x) (where x == hidden __retVal out param)
- *
- * XXX this could be even more effective if we could accomodate
- * cases such as "v.x = f();" - would help with typical vertex
- * transformation.
- */
- n = _slang_gen_function_call_name(A,
- (const char *) oper->children[1].a_id,
- &oper->children[1], &oper->children[0]);
- }
- else {
- slang_ir_node *lhs, *rhs;
-
- /* lhs and rhs type checking */
- if (!_slang_assignment_compatible(A,
- &oper->children[0],
- &oper->children[1])) {
- slang_info_log_error(A->log, "incompatible types in assignment");
- return NULL;
- }
-
- lhs = _slang_gen_operation(A, &oper->children[0]);
- if (!lhs) {
- return NULL;
- }
-
- if (!lhs->Store) {
- slang_info_log_error(A->log,
- "invalid left hand side for assignment");
- return NULL;
- }
-
- /* check that lhs is writable */
- if (!is_store_writable(A, lhs->Store)) {
- slang_info_log_error(A->log,
- "illegal assignment to read-only l-value");
- return NULL;
- }
-
- rhs = _slang_gen_operation(A, &oper->children[1]);
- if (lhs && rhs) {
- /* convert lhs swizzle into writemask */
- const GLuint swizzle = root_swizzle(lhs->Store);
- GLuint writemask, newSwizzle = 0x0;
- if (!swizzle_to_writemask(A, swizzle, &writemask, &newSwizzle)) {
- /* Non-simple writemask, need to swizzle right hand side in
- * order to put components into the right place.
- */
- rhs = _slang_gen_swizzle(rhs, newSwizzle);
- }
- n = new_node2(IR_COPY, lhs, rhs);
- }
- else {
- return NULL;
- }
- }
-
- if (n && pred) {
- /* predicate the assignment code on __notRetFlag */
- slang_ir_node *top, *cond;
-
- cond = _slang_gen_operation(A, pred);
- top = new_if(cond, n, NULL);
- return top;
- }
- return n;
-}
-
-
-/**
- * Generate IR tree for referencing a field in a struct (or basic vector type)
- */
-static slang_ir_node *
-_slang_gen_struct_field(slang_assemble_ctx * A, slang_operation *oper)
-{
- slang_typeinfo ti;
-
- /* type of struct */
- slang_typeinfo_construct(&ti);
- typeof_operation(A, &oper->children[0], &ti);
-
- if (_slang_type_is_vector(ti.spec.type)) {
- /* the field should be a swizzle */
- const GLuint rows = _slang_type_dim(ti.spec.type);
- slang_swizzle swz;
- slang_ir_node *n;
- GLuint swizzle;
- if (!_slang_is_swizzle((char *) oper->a_id, rows, &swz)) {
- slang_info_log_error(A->log, "Bad swizzle");
- return NULL;
- }
- swizzle = MAKE_SWIZZLE4(swz.swizzle[0],
- swz.swizzle[1],
- swz.swizzle[2],
- swz.swizzle[3]);
-
- n = _slang_gen_operation(A, &oper->children[0]);
- /* create new parent node with swizzle */
- if (n)
- n = _slang_gen_swizzle(n, swizzle);
- return n;
- }
- else if ( ti.spec.type == SLANG_SPEC_FLOAT
- || ti.spec.type == SLANG_SPEC_INT
- || ti.spec.type == SLANG_SPEC_BOOL) {
- const GLuint rows = 1;
- slang_swizzle swz;
- slang_ir_node *n;
- GLuint swizzle;
- if (!_slang_is_swizzle((char *) oper->a_id, rows, &swz)) {
- slang_info_log_error(A->log, "Bad swizzle");
- }
- swizzle = MAKE_SWIZZLE4(swz.swizzle[0],
- swz.swizzle[1],
- swz.swizzle[2],
- swz.swizzle[3]);
- n = _slang_gen_operation(A, &oper->children[0]);
- /* create new parent node with swizzle */
- n = _slang_gen_swizzle(n, swizzle);
- return n;
- }
- else {
- /* the field is a structure member (base.field) */
- /* oper->children[0] is the base */
- /* oper->a_id is the field name */
- slang_ir_node *base, *n;
- slang_typeinfo field_ti;
- GLint fieldSize, fieldOffset = -1;
-
- /* type of field */
- slang_typeinfo_construct(&field_ti);
- typeof_operation(A, oper, &field_ti);
-
- fieldSize = _slang_sizeof_type_specifier(&field_ti.spec);
- if (fieldSize > 0)
- fieldOffset = _slang_field_offset(&ti.spec, oper->a_id);
-
- if (fieldSize == 0 || fieldOffset < 0) {
- const char *structName;
- if (ti.spec._struct)
- structName = (char *) ti.spec._struct->a_name;
- else
- structName = "unknown";
- slang_info_log_error(A->log,
- "\"%s\" is not a member of struct \"%s\"",
- (char *) oper->a_id, structName);
- return NULL;
- }
- assert(fieldSize >= 0);
-
- base = _slang_gen_operation(A, &oper->children[0]);
- if (!base) {
- /* error msg should have already been logged */
- return NULL;
- }
-
- n = new_node1(IR_FIELD, base);
- if (!n)
- return NULL;
-
- n->Field = (char *) oper->a_id;
-
- /* Store the field's offset in storage->Index */
- n->Store = _slang_new_ir_storage(base->Store->File,
- fieldOffset,
- fieldSize);
-
- return n;
- }
-}
-
-
-/**
- * Gen code for array indexing.
- */
-static slang_ir_node *
-_slang_gen_array_element(slang_assemble_ctx * A, slang_operation *oper)
-{
- slang_typeinfo array_ti;
-
- /* get array's type info */
- slang_typeinfo_construct(&array_ti);
- typeof_operation(A, &oper->children[0], &array_ti);
-
- if (_slang_type_is_vector(array_ti.spec.type)) {
- /* indexing a simple vector type: "vec4 v; v[0]=p;" */
- /* translate the index into a swizzle/writemask: "v.x=p" */
- const GLuint max = _slang_type_dim(array_ti.spec.type);
- GLint index;
- slang_ir_node *n;
-
- index = (GLint) oper->children[1].literal[0];
- if (oper->children[1].type != SLANG_OPER_LITERAL_INT ||
- index >= (GLint) max) {
-#if 0
- slang_info_log_error(A->log, "Invalid array index for vector type");
- printf("type = %d\n", oper->children[1].type);
- printf("index = %d, max = %d\n", index, max);
- printf("array = %s\n", (char*)oper->children[0].a_id);
- printf("index = %s\n", (char*)oper->children[1].a_id);
- return NULL;
-#else
- index = 0;
-#endif
- }
-
- n = _slang_gen_operation(A, &oper->children[0]);
- if (n) {
- /* use swizzle to access the element */
- GLuint swizzle = MAKE_SWIZZLE4(SWIZZLE_X + index,
- SWIZZLE_NIL,
- SWIZZLE_NIL,
- SWIZZLE_NIL);
- n = _slang_gen_swizzle(n, swizzle);
- }
- return n;
- }
- else {
- /* conventional array */
- slang_typeinfo elem_ti;
- slang_ir_node *elem, *array, *index;
- GLint elemSize, arrayLen;
-
- /* size of array element */
- slang_typeinfo_construct(&elem_ti);
- typeof_operation(A, oper, &elem_ti);
- elemSize = _slang_sizeof_type_specifier(&elem_ti.spec);
-
- if (_slang_type_is_matrix(array_ti.spec.type))
- arrayLen = _slang_type_dim(array_ti.spec.type);
- else
- arrayLen = array_ti.array_len;
-
- slang_typeinfo_destruct(&array_ti);
- slang_typeinfo_destruct(&elem_ti);
-
- if (elemSize <= 0) {
- /* unknown var or type */
- slang_info_log_error(A->log, "Undefined variable or type");
- return NULL;
- }
-
- array = _slang_gen_operation(A, &oper->children[0]);
- index = _slang_gen_operation(A, &oper->children[1]);
- if (array && index) {
- /* bounds check */
- GLint constIndex = -1;
- if (index->Opcode == IR_FLOAT) {
- constIndex = (int) index->Value[0];
- if (constIndex < 0 || constIndex >= arrayLen) {
- slang_info_log_error(A->log,
- "Array index out of bounds (index=%d size=%d)",
- constIndex, arrayLen);
- _slang_free_ir_tree(array);
- _slang_free_ir_tree(index);
- return NULL;
- }
- }
-
- if (!array->Store) {
- slang_info_log_error(A->log, "Invalid array");
- return NULL;
- }
-
- elem = new_node2(IR_ELEMENT, array, index);
-
- /* The storage info here will be updated during code emit */
- elem->Store = _slang_new_ir_storage(array->Store->File,
- array->Store->Index,
- elemSize);
- elem->Store->Swizzle = _slang_var_swizzle(elemSize, 0);
- return elem;
- }
- else {
- _slang_free_ir_tree(array);
- _slang_free_ir_tree(index);
- return NULL;
- }
- }
-}
-
-
-static slang_ir_node *
-_slang_gen_compare(slang_assemble_ctx *A, slang_operation *oper,
- slang_ir_opcode opcode)
-{
- slang_typeinfo t0, t1;
- slang_ir_node *n;
-
- slang_typeinfo_construct(&t0);
- typeof_operation(A, &oper->children[0], &t0);
-
- slang_typeinfo_construct(&t1);
- typeof_operation(A, &oper->children[0], &t1);
-
- if (t0.spec.type == SLANG_SPEC_ARRAY ||
- t1.spec.type == SLANG_SPEC_ARRAY) {
- slang_info_log_error(A->log, "Illegal array comparison");
- return NULL;
- }
-
- if (oper->type != SLANG_OPER_EQUAL &&
- oper->type != SLANG_OPER_NOTEQUAL) {
- /* <, <=, >, >= can only be used with scalars */
- if ((t0.spec.type != SLANG_SPEC_INT &&
- t0.spec.type != SLANG_SPEC_FLOAT) ||
- (t1.spec.type != SLANG_SPEC_INT &&
- t1.spec.type != SLANG_SPEC_FLOAT)) {
- slang_info_log_error(A->log, "Incompatible type(s) for inequality operator");
- return NULL;
- }
- }
-
- n = new_node2(opcode,
- _slang_gen_operation(A, &oper->children[0]),
- _slang_gen_operation(A, &oper->children[1]));
-
- /* result is a bool (size 1) */
- n->Store = _slang_new_ir_storage(PROGRAM_TEMPORARY, -1, 1);
-
- return n;
-}
-
-
-#if 0
-static void
-print_vars(slang_variable_scope *s)
-{
- int i;
- printf("vars: ");
- for (i = 0; i < s->num_variables; i++) {
- printf("%s %d, \n",
- (char*) s->variables[i]->a_name,
- s->variables[i]->declared);
- }
-
- printf("\n");
-}
-#endif
-
-
-#if 0
-static void
-_slang_undeclare_vars(slang_variable_scope *locals)
-{
- if (locals->num_variables > 0) {
- int i;
- for (i = 0; i < locals->num_variables; i++) {
- slang_variable *v = locals->variables[i];
- printf("undeclare %s at %p\n", (char*) v->a_name, v);
- v->declared = GL_FALSE;
- }
- }
-}
-#endif
-
-
-/**
- * Generate IR tree for a slang_operation (AST node)
- */
-static slang_ir_node *
-_slang_gen_operation(slang_assemble_ctx * A, slang_operation *oper)
-{
- switch (oper->type) {
- case SLANG_OPER_BLOCK_NEW_SCOPE:
- {
- slang_ir_node *n;
-
- _slang_push_var_table(A->vartable);
-
- oper->type = SLANG_OPER_BLOCK_NO_NEW_SCOPE; /* temp change */
- n = _slang_gen_operation(A, oper);
- oper->type = SLANG_OPER_BLOCK_NEW_SCOPE; /* restore */
-
- _slang_pop_var_table(A->vartable);
-
- /*_slang_undeclare_vars(oper->locals);*/
- /*print_vars(oper->locals);*/
-
- if (n)
- n = new_node1(IR_SCOPE, n);
- return n;
- }
- break;
-
- case SLANG_OPER_BLOCK_NO_NEW_SCOPE:
- /* list of operations */
- if (oper->num_children > 0)
- {
- slang_ir_node *n, *tree = NULL;
- GLuint i;
-
- for (i = 0; i < oper->num_children; i++) {
- n = _slang_gen_operation(A, &oper->children[i]);
- if (!n) {
- _slang_free_ir_tree(tree);
- return NULL; /* error must have occured */
- }
- tree = new_seq(tree, n);
- }
-
- return tree;
- }
- else {
- return new_node0(IR_NOP);
- }
-
- case SLANG_OPER_EXPRESSION:
- return _slang_gen_operation(A, &oper->children[0]);
-
- case SLANG_OPER_FOR:
- return _slang_gen_for(A, oper);
- case SLANG_OPER_DO:
- return _slang_gen_do(A, oper);
- case SLANG_OPER_WHILE:
- return _slang_gen_while(A, oper);
- case SLANG_OPER_BREAK:
- if (!current_loop_oper(A)) {
- slang_info_log_error(A->log, "'break' not in loop");
- return NULL;
- }
- return new_break(current_loop_ir(A));
- case SLANG_OPER_CONTINUE:
- if (!current_loop_oper(A)) {
- slang_info_log_error(A->log, "'continue' not in loop");
- return NULL;
- }
- return _slang_gen_continue(A, oper);
- case SLANG_OPER_DISCARD:
- return new_node0(IR_KILL);
-
- case SLANG_OPER_EQUAL:
- return _slang_gen_compare(A, oper, IR_EQUAL);
- case SLANG_OPER_NOTEQUAL:
- return _slang_gen_compare(A, oper, IR_NOTEQUAL);
- case SLANG_OPER_GREATER:
- return _slang_gen_compare(A, oper, IR_SGT);
- case SLANG_OPER_LESS:
- return _slang_gen_compare(A, oper, IR_SLT);
- case SLANG_OPER_GREATEREQUAL:
- return _slang_gen_compare(A, oper, IR_SGE);
- case SLANG_OPER_LESSEQUAL:
- return _slang_gen_compare(A, oper, IR_SLE);
- case SLANG_OPER_ADD:
- {
- slang_ir_node *n;
- assert(oper->num_children == 2);
- n = _slang_gen_function_call_name(A, "+", oper, NULL);
- return n;
- }
- case SLANG_OPER_SUBTRACT:
- {
- slang_ir_node *n;
- assert(oper->num_children == 2);
- n = _slang_gen_function_call_name(A, "-", oper, NULL);
- return n;
- }
- case SLANG_OPER_MULTIPLY:
- {
- slang_ir_node *n;
- assert(oper->num_children == 2);
- n = _slang_gen_function_call_name(A, "*", oper, NULL);
- return n;
- }
- case SLANG_OPER_DIVIDE:
- {
- slang_ir_node *n;
- assert(oper->num_children == 2);
- n = _slang_gen_function_call_name(A, "/", oper, NULL);
- return n;
- }
- case SLANG_OPER_MINUS:
- {
- slang_ir_node *n;
- assert(oper->num_children == 1);
- n = _slang_gen_function_call_name(A, "-", oper, NULL);
- return n;
- }
- case SLANG_OPER_PLUS:
- /* +expr --> do nothing */
- return _slang_gen_operation(A, &oper->children[0]);
- case SLANG_OPER_VARIABLE_DECL:
- return _slang_gen_declaration(A, oper);
- case SLANG_OPER_ASSIGN:
- return _slang_gen_assignment(A, oper);
- case SLANG_OPER_ADDASSIGN:
- {
- slang_ir_node *n;
- assert(oper->num_children == 2);
- n = _slang_gen_function_call_name(A, "+=", oper, NULL);
- return n;
- }
- case SLANG_OPER_SUBASSIGN:
- {
- slang_ir_node *n;
- assert(oper->num_children == 2);
- n = _slang_gen_function_call_name(A, "-=", oper, NULL);
- return n;
- }
- break;
- case SLANG_OPER_MULASSIGN:
- {
- slang_ir_node *n;
- assert(oper->num_children == 2);
- n = _slang_gen_function_call_name(A, "*=", oper, NULL);
- return n;
- }
- case SLANG_OPER_DIVASSIGN:
- {
- slang_ir_node *n;
- assert(oper->num_children == 2);
- n = _slang_gen_function_call_name(A, "/=", oper, NULL);
- return n;
- }
- case SLANG_OPER_LOGICALAND:
- {
- slang_ir_node *n;
- assert(oper->num_children == 2);
- n = _slang_gen_logical_and(A, oper);
- return n;
- }
- case SLANG_OPER_LOGICALOR:
- {
- slang_ir_node *n;
- assert(oper->num_children == 2);
- n = _slang_gen_logical_or(A, oper);
- return n;
- }
- case SLANG_OPER_LOGICALXOR:
- return _slang_gen_xor(A, oper);
- case SLANG_OPER_NOT:
- return _slang_gen_not(A, oper);
- case SLANG_OPER_SELECT: /* b ? x : y */
- {
- slang_ir_node *n;
- assert(oper->num_children == 3);
- n = _slang_gen_select(A, oper);
- return n;
- }
-
- case SLANG_OPER_ASM:
- return _slang_gen_asm(A, oper, NULL);
- case SLANG_OPER_CALL:
- return _slang_gen_function_call_name(A, (const char *) oper->a_id,
- oper, NULL);
- case SLANG_OPER_METHOD:
- return _slang_gen_method_call(A, oper);
- case SLANG_OPER_RETURN:
- return _slang_gen_return(A, oper);
- case SLANG_OPER_RETURN_INLINED:
- return _slang_gen_return(A, oper);
- case SLANG_OPER_LABEL:
- return new_label(oper->label);
- case SLANG_OPER_IDENTIFIER:
- return _slang_gen_variable(A, oper);
- case SLANG_OPER_IF:
- return _slang_gen_if(A, oper);
- case SLANG_OPER_FIELD:
- return _slang_gen_struct_field(A, oper);
- case SLANG_OPER_SUBSCRIPT:
- return _slang_gen_array_element(A, oper);
- case SLANG_OPER_LITERAL_FLOAT:
- /* fall-through */
- case SLANG_OPER_LITERAL_INT:
- /* fall-through */
- case SLANG_OPER_LITERAL_BOOL:
- return new_float_literal(oper->literal, oper->literal_size);
-
- case SLANG_OPER_POSTINCREMENT: /* var++ */
- {
- slang_ir_node *n;
- assert(oper->num_children == 1);
- n = _slang_gen_function_call_name(A, "__postIncr", oper, NULL);
- return n;
- }
- case SLANG_OPER_POSTDECREMENT: /* var-- */
- {
- slang_ir_node *n;
- assert(oper->num_children == 1);
- n = _slang_gen_function_call_name(A, "__postDecr", oper, NULL);
- return n;
- }
- case SLANG_OPER_PREINCREMENT: /* ++var */
- {
- slang_ir_node *n;
- assert(oper->num_children == 1);
- n = _slang_gen_function_call_name(A, "++", oper, NULL);
- return n;
- }
- case SLANG_OPER_PREDECREMENT: /* --var */
- {
- slang_ir_node *n;
- assert(oper->num_children == 1);
- n = _slang_gen_function_call_name(A, "--", oper, NULL);
- return n;
- }
-
- case SLANG_OPER_NON_INLINED_CALL:
- case SLANG_OPER_SEQUENCE:
- {
- slang_ir_node *tree = NULL;
- GLuint i;
- for (i = 0; i < oper->num_children; i++) {
- slang_ir_node *n = _slang_gen_operation(A, &oper->children[i]);
- tree = new_seq(tree, n);
- if (n)
- tree->Store = n->Store;
- }
- if (oper->type == SLANG_OPER_NON_INLINED_CALL) {
- tree = new_function_call(tree, oper->label);
- }
- return tree;
- }
-
- case SLANG_OPER_NONE:
- case SLANG_OPER_VOID:
- /* returning NULL here would generate an error */
- return new_node0(IR_NOP);
-
- default:
- _mesa_problem(NULL, "bad node type %d in _slang_gen_operation",
- oper->type);
- return new_node0(IR_NOP);
- }
-
- return NULL;
-}
-
-
-/**
- * Check if the given type specifier is a rectangular texture sampler.
- */
-static GLboolean
-is_rect_sampler_spec(const slang_type_specifier *spec)
-{
- while (spec->_array) {
- spec = spec->_array;
- }
- return spec->type == SLANG_SPEC_SAMPLER_RECT ||
- spec->type == SLANG_SPEC_SAMPLER_RECT_SHADOW;
-}
-
-
-
-/**
- * Called by compiler when a global variable has been parsed/compiled.
- * Here we examine the variable's type to determine what kind of register
- * storage will be used.
- *
- * A uniform such as "gl_Position" will become the register specification
- * (PROGRAM_OUTPUT, VERT_RESULT_HPOS). Or, uniform "gl_FogFragCoord"
- * will be (PROGRAM_INPUT, FRAG_ATTRIB_FOGC).
- *
- * Samplers are interesting. For "uniform sampler2D tex;" we'll specify
- * (PROGRAM_SAMPLER, index) where index is resolved at link-time to an
- * actual texture unit (as specified by the user calling glUniform1i()).
- */
-GLboolean
-_slang_codegen_global_variable(slang_assemble_ctx *A, slang_variable *var,
- slang_unit_type type)
-{
- struct gl_program *prog = A->program;
- const char *varName = (char *) var->a_name;
- GLboolean success = GL_TRUE;
- slang_ir_storage *store = NULL;
- int dbg = 0;
- const GLenum datatype = _slang_gltype_from_specifier(&var->type.specifier);
- const GLint size = _slang_sizeof_type_specifier(&var->type.specifier);
- const GLint arrayLen = _slang_array_length(var);
- const GLint totalSize = _slang_array_size(size, arrayLen);
- GLint texIndex = sampler_to_texture_index(var->type.specifier.type);
-
- var->is_global = GL_TRUE;
-
- /* check for sampler2D arrays */
- if (texIndex == -1 && var->type.specifier._array)
- texIndex = sampler_to_texture_index(var->type.specifier._array->type);
-
- if (texIndex != -1) {
- /* This is a texture sampler variable...
- * store->File = PROGRAM_SAMPLER
- * store->Index = sampler number (0..7, typically)
- * store->Size = texture type index (1D, 2D, 3D, cube, etc)
- */
- if (var->initializer) {
- slang_info_log_error(A->log, "illegal assignment to '%s'", varName);
- return GL_FALSE;
- }
-#if FEATURE_es2_glsl /* XXX should use FEATURE_texture_rect */
- /* disallow rect samplers */
- if (is_rect_sampler_spec(&var->type.specifier)) {
- slang_info_log_error(A->log, "invalid sampler type for '%s'", varName);
- return GL_FALSE;
- }
-#else
- (void) is_rect_sampler_spec; /* silence warning */
-#endif
- {
- GLint sampNum = _mesa_add_sampler(prog->Parameters, varName, datatype);
- store = _slang_new_ir_storage_sampler(sampNum, texIndex, totalSize);
-
- /* If we have a sampler array, then we need to allocate the
- * additional samplers to ensure we don't allocate them elsewhere.
- * We can't directly use _mesa_add_sampler() as that checks the
- * varName and gets a match, so we call _mesa_add_parameter()
- * directly and use the last sampler number from the call above.
- */
- if (arrayLen > 0) {
- GLint a = arrayLen - 1;
- GLint i;
- for (i = 0; i < a; i++) {
- GLfloat value = (GLfloat)(i + sampNum + 1);
- (void) _mesa_add_parameter(prog->Parameters, PROGRAM_SAMPLER,
- varName, 1, datatype, &value, NULL, 0x0);
- }
- }
- }
- if (dbg) printf("SAMPLER ");
- }
- else if (var->type.qualifier == SLANG_QUAL_UNIFORM) {
- /* Uniform variable */
- const GLuint swizzle = _slang_var_swizzle(totalSize, 0);
-
- if (prog) {
- /* user-defined uniform */
- if (datatype == GL_NONE) {
- if ((var->type.specifier.type == SLANG_SPEC_ARRAY &&
- var->type.specifier._array->type == SLANG_SPEC_STRUCT) ||
- (var->type.specifier.type == SLANG_SPEC_STRUCT)) {
- /* temporary work-around */
- GLenum datatype = GL_FLOAT;
- GLint uniformLoc = _mesa_add_uniform(prog->Parameters, varName,
- totalSize, datatype, NULL);
- store = _slang_new_ir_storage_swz(PROGRAM_UNIFORM, uniformLoc,
- totalSize, swizzle);
-
- if (arrayLen > 0) {
- GLint a = arrayLen - 1;
- GLint i;
- for (i = 0; i < a; i++) {
- GLfloat value = (GLfloat)(i + uniformLoc + 1);
- (void) _mesa_add_parameter(prog->Parameters, PROGRAM_UNIFORM,
- varName, 1, datatype, &value, NULL, 0x0);
- }
- }
-
- /* XXX what we need to do is unroll the struct into its
- * basic types, creating a uniform variable for each.
- * For example:
- * struct foo {
- * vec3 a;
- * vec4 b;
- * };
- * uniform foo f;
- *
- * Should produce uniforms:
- * "f.a" (GL_FLOAT_VEC3)
- * "f.b" (GL_FLOAT_VEC4)
- */
-
- if (var->initializer) {
- slang_info_log_error(A->log,
- "unsupported initializer for uniform '%s'", varName);
- return GL_FALSE;
- }
- }
- else {
- slang_info_log_error(A->log,
- "invalid datatype for uniform variable %s",
- varName);
- return GL_FALSE;
- }
- }
- else {
- /* non-struct uniform */
- if (!_slang_gen_var_decl(A, var, var->initializer))
- return GL_FALSE;
- store = var->store;
- }
- }
- else {
- /* pre-defined uniform, like gl_ModelviewMatrix */
- /* We know it's a uniform, but don't allocate storage unless
- * it's really used.
- */
- store = _slang_new_ir_storage_swz(PROGRAM_STATE_VAR, -1,
- totalSize, swizzle);
- }
- if (dbg) printf("UNIFORM (sz %d) ", totalSize);
- }
- else if (var->type.qualifier == SLANG_QUAL_VARYING) {
- /* varyings must be float, vec or mat */
- if (!_slang_type_is_float_vec_mat(var->type.specifier.type) &&
- var->type.specifier.type != SLANG_SPEC_ARRAY) {
- slang_info_log_error(A->log,
- "varying '%s' must be float/vector/matrix",
- varName);
- return GL_FALSE;
- }
-
- if (var->initializer) {
- slang_info_log_error(A->log, "illegal initializer for varying '%s'",
- varName);
- return GL_FALSE;
- }
-
- if (prog) {
- /* user-defined varying */
- GLbitfield flags;
- GLint varyingLoc;
- GLuint swizzle;
-
- flags = 0x0;
- if (var->type.centroid == SLANG_CENTROID)
- flags |= PROG_PARAM_BIT_CENTROID;
- if (var->type.variant == SLANG_INVARIANT)
- flags |= PROG_PARAM_BIT_INVARIANT;
-
- varyingLoc = _mesa_add_varying(prog->Varying, varName,
- totalSize, flags);
- swizzle = _slang_var_swizzle(size, 0);
- store = _slang_new_ir_storage_swz(PROGRAM_VARYING, varyingLoc,
- totalSize, swizzle);
- }
- else {
- /* pre-defined varying, like gl_Color or gl_TexCoord */
- if (type == SLANG_UNIT_FRAGMENT_BUILTIN) {
- /* fragment program input */
- GLuint swizzle;
- GLint index = _slang_input_index(varName, GL_FRAGMENT_PROGRAM_ARB,
- &swizzle);
- assert(index >= 0);
- assert(index < FRAG_ATTRIB_MAX);
- store = _slang_new_ir_storage_swz(PROGRAM_INPUT, index,
- size, swizzle);
- }
- else {
- /* vertex program output */
- GLint index = _slang_output_index(varName, GL_VERTEX_PROGRAM_ARB);
- GLuint swizzle = _slang_var_swizzle(size, 0);
- assert(index >= 0);
- assert(index < VERT_RESULT_MAX);
- assert(type == SLANG_UNIT_VERTEX_BUILTIN);
- store = _slang_new_ir_storage_swz(PROGRAM_OUTPUT, index,
- size, swizzle);
- }
- if (dbg) printf("V/F ");
- }
- if (dbg) printf("VARYING ");
- }
- else if (var->type.qualifier == SLANG_QUAL_ATTRIBUTE) {
- GLuint swizzle;
- GLint index;
- /* attributes must be float, vec or mat */
- if (!_slang_type_is_float_vec_mat(var->type.specifier.type)) {
- slang_info_log_error(A->log,
- "attribute '%s' must be float/vector/matrix",
- varName);
- return GL_FALSE;
- }
-
- if (prog) {
- /* user-defined vertex attribute */
- const GLint attr = -1; /* unknown */
- swizzle = _slang_var_swizzle(size, 0);
- index = _mesa_add_attribute(prog->Attributes, varName,
- size, datatype, attr);
- assert(index >= 0);
- index = VERT_ATTRIB_GENERIC0 + index;
- }
- else {
- /* pre-defined vertex attrib */
- index = _slang_input_index(varName, GL_VERTEX_PROGRAM_ARB, &swizzle);
- assert(index >= 0);
- }
- store = _slang_new_ir_storage_swz(PROGRAM_INPUT, index, size, swizzle);
- if (dbg) printf("ATTRIB ");
- }
- else if (var->type.qualifier == SLANG_QUAL_FIXEDINPUT) {
- GLuint swizzle = SWIZZLE_XYZW; /* silence compiler warning */
- GLint index = _slang_input_index(varName, GL_FRAGMENT_PROGRAM_ARB,
- &swizzle);
- store = _slang_new_ir_storage_swz(PROGRAM_INPUT, index, size, swizzle);
- if (dbg) printf("INPUT ");
- }
- else if (var->type.qualifier == SLANG_QUAL_FIXEDOUTPUT) {
- if (type == SLANG_UNIT_VERTEX_BUILTIN) {
- GLint index = _slang_output_index(varName, GL_VERTEX_PROGRAM_ARB);
- store = _slang_new_ir_storage(PROGRAM_OUTPUT, index, size);
- }
- else {
- GLint index = _slang_output_index(varName, GL_FRAGMENT_PROGRAM_ARB);
- GLint specialSize = 4; /* treat all fragment outputs as float[4] */
- assert(type == SLANG_UNIT_FRAGMENT_BUILTIN);
- store = _slang_new_ir_storage(PROGRAM_OUTPUT, index, specialSize);
- }
- if (dbg) printf("OUTPUT ");
- }
- else if (var->type.qualifier == SLANG_QUAL_CONST && !prog) {
- /* pre-defined global constant, like gl_MaxLights */
- store = _slang_new_ir_storage(PROGRAM_CONSTANT, -1, size);
- if (dbg) printf("CONST ");
- }
- else {
- /* ordinary variable (may be const) */
- slang_ir_node *n;
-
- /* IR node to declare the variable */
- n = _slang_gen_var_decl(A, var, var->initializer);
-
- /* emit GPU instructions */
- success = _slang_emit_code(n, A->vartable, A->program, A->pragmas, GL_FALSE, A->log);
-
- _slang_free_ir_tree(n);
- }
-
- if (dbg) printf("GLOBAL VAR %s idx %d\n", (char*) var->a_name,
- store ? store->Index : -2);
-
- if (store)
- var->store = store; /* save var's storage info */
-
- var->declared = GL_TRUE;
-
- return success;
-}
-
-
-/**
- * Produce an IR tree from a function AST (fun->body).
- * Then call the code emitter to convert the IR tree into gl_program
- * instructions.
- */
-GLboolean
-_slang_codegen_function(slang_assemble_ctx * A, slang_function * fun)
-{
- slang_ir_node *n;
- GLboolean success = GL_TRUE;
-
- if (strcmp((char *) fun->header.a_name, "main") != 0) {
- /* we only really generate code for main, all other functions get
- * inlined or codegen'd upon an actual call.
- */
-#if 0
- /* do some basic error checking though */
- if (fun->header.type.specifier.type != SLANG_SPEC_VOID) {
- /* check that non-void functions actually return something */
- slang_operation *op
- = _slang_find_node_type(fun->body, SLANG_OPER_RETURN);
- if (!op) {
- slang_info_log_error(A->log,
- "function \"%s\" has no return statement",
- (char *) fun->header.a_name);
- printf(
- "function \"%s\" has no return statement\n",
- (char *) fun->header.a_name);
- return GL_FALSE;
- }
- }
-#endif
- return GL_TRUE; /* not an error */
- }
-
-#if 0
- printf("\n*********** codegen_function %s\n", (char *) fun->header.a_name);
- slang_print_function(fun, 1);
-#endif
-
- /* should have been allocated earlier: */
- assert(A->program->Parameters );
- assert(A->program->Varying);
- assert(A->vartable);
-
- A->LoopDepth = 0;
- A->UseReturnFlag = GL_FALSE;
- A->CurFunction = fun;
-
- /* fold constant expressions, etc. */
- _slang_simplify(fun->body, &A->space, A->atoms);
-
-#if 0
- printf("\n*********** simplified %s\n", (char *) fun->header.a_name);
- slang_print_function(fun, 1);
-#endif
-
- /* Create an end-of-function label */
- A->curFuncEndLabel = _slang_label_new("__endOfFunc__main");
-
- /* push new vartable scope */
- _slang_push_var_table(A->vartable);
-
- /* Generate IR tree for the function body code */
- n = _slang_gen_operation(A, fun->body);
- if (n)
- n = new_node1(IR_SCOPE, n);
-
- /* pop vartable, restore previous */
- _slang_pop_var_table(A->vartable);
-
- if (!n) {
- /* XXX record error */
- return GL_FALSE;
- }
-
- /* append an end-of-function-label to IR tree */
- n = new_seq(n, new_label(A->curFuncEndLabel));
-
- /*_slang_label_delete(A->curFuncEndLabel);*/
- A->curFuncEndLabel = NULL;
-
-#if 0
- printf("************* New AST for %s *****\n", (char*)fun->header.a_name);
- slang_print_function(fun, 1);
-#endif
-#if 0
- printf("************* IR for %s *******\n", (char*)fun->header.a_name);
- _slang_print_ir_tree(n, 0);
-#endif
-#if 0
- printf("************* End codegen function ************\n\n");
-#endif
-
- if (A->UnresolvedRefs) {
- /* Can't codegen at this time.
- * At link time we'll concatenate all the vertex shaders and/or all
- * the fragment shaders and try recompiling.
- */
- return GL_TRUE;
- }
-
- /* Emit program instructions */
- success = _slang_emit_code(n, A->vartable, A->program, A->pragmas, GL_TRUE, A->log);
- _slang_free_ir_tree(n);
-
- /* free codegen context */
- /*
- free(A->codegen);
- */
-
- return success;
-}
-