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Diffstat (limited to 'mesalib/src/glsl/ir_reader.cpp')
| -rw-r--r-- | mesalib/src/glsl/ir_reader.cpp | 1146 |
1 files changed, 1146 insertions, 0 deletions
diff --git a/mesalib/src/glsl/ir_reader.cpp b/mesalib/src/glsl/ir_reader.cpp new file mode 100644 index 000000000..a9cbf8ea9 --- /dev/null +++ b/mesalib/src/glsl/ir_reader.cpp @@ -0,0 +1,1146 @@ +/* + * Copyright © 2010 Intel Corporation + * + * 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 (including the next + * paragraph) 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 + * THE AUTHORS OR COPYRIGHT HOLDERS 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. + */ + +#include <cstdarg> + +extern "C" { +#include <talloc.h> +} + +#include "ir_reader.h" +#include "glsl_parser_extras.h" +#include "glsl_types.h" +#include "s_expression.h" + +const static bool debug = false; + +static void ir_read_error(_mesa_glsl_parse_state *, s_expression *, + const char *fmt, ...); +static const glsl_type *read_type(_mesa_glsl_parse_state *, s_expression *); + +static void scan_for_prototypes(_mesa_glsl_parse_state *, exec_list *, + s_expression *); +static ir_function *read_function(_mesa_glsl_parse_state *, s_list *, + bool skip_body); +static void read_function_sig(_mesa_glsl_parse_state *, ir_function *, + s_list *, bool skip_body); + +static void read_instructions(_mesa_glsl_parse_state *, exec_list *, + s_expression *, ir_loop *); +static ir_instruction *read_instruction(_mesa_glsl_parse_state *, + s_expression *, ir_loop *); +static ir_variable *read_declaration(_mesa_glsl_parse_state *, s_list *); +static ir_if *read_if(_mesa_glsl_parse_state *, s_list *, ir_loop *); +static ir_loop *read_loop(_mesa_glsl_parse_state *st, s_list *list); +static ir_return *read_return(_mesa_glsl_parse_state *, s_list *); + +static ir_rvalue *read_rvalue(_mesa_glsl_parse_state *, s_expression *); +static ir_assignment *read_assignment(_mesa_glsl_parse_state *, s_list *); +static ir_expression *read_expression(_mesa_glsl_parse_state *, s_list *); +static ir_call *read_call(_mesa_glsl_parse_state *, s_list *); +static ir_swizzle *read_swizzle(_mesa_glsl_parse_state *, s_list *); +static ir_constant *read_constant(_mesa_glsl_parse_state *, s_list *); +static ir_texture *read_texture(_mesa_glsl_parse_state *, s_list *); + +static ir_dereference *read_dereference(_mesa_glsl_parse_state *, + s_expression *); +static ir_dereference *read_var_ref(_mesa_glsl_parse_state *, s_list *); +static ir_dereference *read_array_ref(_mesa_glsl_parse_state *, s_list *); +static ir_dereference *read_record_ref(_mesa_glsl_parse_state *, s_list *); + +void +_mesa_glsl_read_ir(_mesa_glsl_parse_state *state, exec_list *instructions, + const char *src, bool scan_for_protos) +{ + s_expression *expr = s_expression::read_expression(state, src); + if (expr == NULL) { + ir_read_error(state, NULL, "couldn't parse S-Expression."); + return; + } + + if (scan_for_protos) { + scan_for_prototypes(state, instructions, expr); + if (state->error) + return; + } + + read_instructions(state, instructions, expr, NULL); + talloc_free(expr); + + if (debug) + validate_ir_tree(instructions); +} + +static void +ir_read_error(_mesa_glsl_parse_state *state, s_expression *expr, + const char *fmt, ...) +{ + va_list ap; + + state->error = true; + + if (state->current_function != NULL) + state->info_log = talloc_asprintf_append(state->info_log, + "In function %s:\n", + state->current_function->function_name()); + state->info_log = talloc_strdup_append(state->info_log, "error: "); + + va_start(ap, fmt); + state->info_log = talloc_vasprintf_append(state->info_log, fmt, ap); + va_end(ap); + state->info_log = talloc_strdup_append(state->info_log, "\n"); + + if (expr != NULL) { + state->info_log = talloc_strdup_append(state->info_log, + "...in this context:\n "); + expr->print(); + state->info_log = talloc_strdup_append(state->info_log, "\n\n"); + } +} + +static const glsl_type * +read_type(_mesa_glsl_parse_state *st, s_expression *expr) +{ + s_list *list = SX_AS_LIST(expr); + if (list != NULL) { + s_symbol *type_sym = SX_AS_SYMBOL(list->subexpressions.get_head()); + if (type_sym == NULL) { + ir_read_error(st, expr, "expected type (array ...) or (struct ...)"); + return NULL; + } + if (strcmp(type_sym->value(), "array") == 0) { + if (list->length() != 3) { + ir_read_error(st, expr, "expected type (array <type> <int>)"); + return NULL; + } + + // Read base type + s_expression *base_expr = (s_expression*) type_sym->next; + const glsl_type *base_type = read_type(st, base_expr); + if (base_type == NULL) { + ir_read_error(st, NULL, "when reading base type of array"); + return NULL; + } + + // Read array size + s_int *size = SX_AS_INT(base_expr->next); + if (size == NULL) { + ir_read_error(st, expr, "found non-integer array size"); + return NULL; + } + + return glsl_type::get_array_instance(base_type, size->value()); + } else if (strcmp(type_sym->value(), "struct") == 0) { + assert(false); // FINISHME + } else { + ir_read_error(st, expr, "expected (array ...) or (struct ...); " + "found (%s ...)", type_sym->value()); + return NULL; + } + } + + s_symbol *type_sym = SX_AS_SYMBOL(expr); + if (type_sym == NULL) { + ir_read_error(st, expr, "expected <type> (symbol or list)"); + return NULL; + } + + const glsl_type *type = st->symbols->get_type(type_sym->value()); + if (type == NULL) + ir_read_error(st, expr, "invalid type: %s", type_sym->value()); + + return type; +} + + +static void +scan_for_prototypes(_mesa_glsl_parse_state *st, exec_list *instructions, + s_expression *expr) +{ + s_list *list = SX_AS_LIST(expr); + if (list == NULL) { + ir_read_error(st, expr, "Expected (<instruction> ...); found an atom."); + return; + } + + foreach_iter(exec_list_iterator, it, list->subexpressions) { + s_list *sub = SX_AS_LIST(it.get()); + if (sub == NULL) + continue; // not a (function ...); ignore it. + + s_symbol *tag = SX_AS_SYMBOL(sub->subexpressions.get_head()); + if (tag == NULL || strcmp(tag->value(), "function") != 0) + continue; // not a (function ...); ignore it. + + ir_function *f = read_function(st, sub, true); + if (f == NULL) + return; + instructions->push_tail(f); + } +} + +static ir_function * +read_function(_mesa_glsl_parse_state *st, s_list *list, bool skip_body) +{ + void *ctx = st; + bool added = false; + if (list->length() < 3) { + ir_read_error(st, list, "Expected (function <name> (signature ...) ...)"); + return NULL; + } + + s_symbol *name = SX_AS_SYMBOL(list->subexpressions.head->next); + if (name == NULL) { + ir_read_error(st, list, "Expected (function <name> ...)"); + return NULL; + } + + ir_function *f = st->symbols->get_function(name->value()); + if (f == NULL) { + f = new(ctx) ir_function(name->value()); + added = st->symbols->add_function(f->name, f); + assert(added); + } + + exec_list_iterator it = list->subexpressions.iterator(); + it.next(); // skip "function" tag + it.next(); // skip function name + for (/* nothing */; it.has_next(); it.next()) { + s_list *siglist = SX_AS_LIST(it.get()); + if (siglist == NULL) { + ir_read_error(st, list, "Expected (function (signature ...) ...)"); + return NULL; + } + + s_symbol *tag = SX_AS_SYMBOL(siglist->subexpressions.get_head()); + if (tag == NULL || strcmp(tag->value(), "signature") != 0) { + ir_read_error(st, siglist, "Expected (signature ...)"); + return NULL; + } + + read_function_sig(st, f, siglist, skip_body); + } + return added ? f : NULL; +} + +static void +read_function_sig(_mesa_glsl_parse_state *st, ir_function *f, s_list *list, + bool skip_body) +{ + void *ctx = st; + if (list->length() != 4) { + ir_read_error(st, list, "Expected (signature <type> (parameters ...) " + "(<instruction> ...))"); + return; + } + + s_expression *type_expr = (s_expression*) list->subexpressions.head->next; + const glsl_type *return_type = read_type(st, type_expr); + if (return_type == NULL) + return; + + s_list *paramlist = SX_AS_LIST(type_expr->next); + s_list *body_list = SX_AS_LIST(paramlist->next); + if (paramlist == NULL || body_list == NULL) { + ir_read_error(st, list, "Expected (signature <type> (parameters ...) " + "(<instruction> ...))"); + return; + } + s_symbol *paramtag = SX_AS_SYMBOL(paramlist->subexpressions.get_head()); + if (paramtag == NULL || strcmp(paramtag->value(), "parameters") != 0) { + ir_read_error(st, paramlist, "Expected (parameters ...)"); + return; + } + + // Read the parameters list into a temporary place. + exec_list hir_parameters; + st->symbols->push_scope(); + + exec_list_iterator it = paramlist->subexpressions.iterator(); + for (it.next() /* skip "parameters" */; it.has_next(); it.next()) { + s_list *decl = SX_AS_LIST(it.get()); + ir_variable *var = read_declaration(st, decl); + if (var == NULL) + return; + + hir_parameters.push_tail(var); + } + + ir_function_signature *sig = f->exact_matching_signature(&hir_parameters); + if (sig == NULL && skip_body) { + /* If scanning for prototypes, generate a new signature. */ + sig = new(ctx) ir_function_signature(return_type); + sig->is_builtin = true; + f->add_signature(sig); + } else if (sig != NULL) { + const char *badvar = sig->qualifiers_match(&hir_parameters); + if (badvar != NULL) { + ir_read_error(st, list, "function `%s' parameter `%s' qualifiers " + "don't match prototype", f->name, badvar); + return; + } + + if (sig->return_type != return_type) { + ir_read_error(st, list, "function `%s' return type doesn't " + "match prototype", f->name); + return; + } + } else { + /* No prototype for this body exists - skip it. */ + st->symbols->pop_scope(); + return; + } + assert(sig != NULL); + + sig->replace_parameters(&hir_parameters); + + if (!skip_body && !body_list->subexpressions.is_empty()) { + if (sig->is_defined) { + ir_read_error(st, list, "function %s redefined", f->name); + return; + } + st->current_function = sig; + read_instructions(st, &sig->body, body_list, NULL); + st->current_function = NULL; + sig->is_defined = true; + } + + st->symbols->pop_scope(); +} + +static void +read_instructions(_mesa_glsl_parse_state *st, exec_list *instructions, + s_expression *expr, ir_loop *loop_ctx) +{ + // Read in a list of instructions + s_list *list = SX_AS_LIST(expr); + if (list == NULL) { + ir_read_error(st, expr, "Expected (<instruction> ...); found an atom."); + return; + } + + foreach_iter(exec_list_iterator, it, list->subexpressions) { + s_expression *sub = (s_expression*) it.get(); + ir_instruction *ir = read_instruction(st, sub, loop_ctx); + if (ir != NULL) { + /* Global variable declarations should be moved to the top, before + * any functions that might use them. Functions are added to the + * instruction stream when scanning for prototypes, so without this + * hack, they always appear before variable declarations. + */ + if (st->current_function == NULL && ir->as_variable() != NULL) + instructions->push_head(ir); + else + instructions->push_tail(ir); + } + } +} + + +static ir_instruction * +read_instruction(_mesa_glsl_parse_state *st, s_expression *expr, + ir_loop *loop_ctx) +{ + void *ctx = st; + s_symbol *symbol = SX_AS_SYMBOL(expr); + if (symbol != NULL) { + if (strcmp(symbol->value(), "break") == 0 && loop_ctx != NULL) + return new(ctx) ir_loop_jump(ir_loop_jump::jump_break); + if (strcmp(symbol->value(), "continue") == 0 && loop_ctx != NULL) + return new(ctx) ir_loop_jump(ir_loop_jump::jump_continue); + } + + s_list *list = SX_AS_LIST(expr); + if (list == NULL || list->subexpressions.is_empty()) { + ir_read_error(st, expr, "Invalid instruction.\n"); + return NULL; + } + + s_symbol *tag = SX_AS_SYMBOL(list->subexpressions.get_head()); + if (tag == NULL) { + ir_read_error(st, expr, "expected instruction tag"); + return NULL; + } + + ir_instruction *inst = NULL; + if (strcmp(tag->value(), "declare") == 0) { + inst = read_declaration(st, list); + } else if (strcmp(tag->value(), "assign") == 0) { + inst = read_assignment(st, list); + } else if (strcmp(tag->value(), "if") == 0) { + inst = read_if(st, list, loop_ctx); + } else if (strcmp(tag->value(), "loop") == 0) { + inst = read_loop(st, list); + } else if (strcmp(tag->value(), "return") == 0) { + inst = read_return(st, list); + } else if (strcmp(tag->value(), "function") == 0) { + inst = read_function(st, list, false); + } else { + inst = read_rvalue(st, list); + if (inst == NULL) + ir_read_error(st, NULL, "when reading instruction"); + } + return inst; +} + + +static ir_variable * +read_declaration(_mesa_glsl_parse_state *st, s_list *list) +{ + void *ctx = st; + if (list->length() != 4) { + ir_read_error(st, list, "expected (declare (<qualifiers>) <type> " + "<name>)"); + return NULL; + } + + s_list *quals = SX_AS_LIST(list->subexpressions.head->next); + if (quals == NULL) { + ir_read_error(st, list, "expected a list of variable qualifiers"); + return NULL; + } + + s_expression *type_expr = (s_expression*) quals->next; + const glsl_type *type = read_type(st, type_expr); + if (type == NULL) + return NULL; + + s_symbol *var_name = SX_AS_SYMBOL(type_expr->next); + if (var_name == NULL) { + ir_read_error(st, list, "expected variable name, found non-symbol"); + return NULL; + } + + ir_variable *var = new(ctx) ir_variable(type, var_name->value(), + ir_var_auto); + + foreach_iter(exec_list_iterator, it, quals->subexpressions) { + s_symbol *qualifier = SX_AS_SYMBOL(it.get()); + if (qualifier == NULL) { + ir_read_error(st, list, "qualifier list must contain only symbols"); + delete var; + return NULL; + } + + // FINISHME: Check for duplicate/conflicting qualifiers. + if (strcmp(qualifier->value(), "centroid") == 0) { + var->centroid = 1; + } else if (strcmp(qualifier->value(), "invariant") == 0) { + var->invariant = 1; + } else if (strcmp(qualifier->value(), "uniform") == 0) { + var->mode = ir_var_uniform; + } else if (strcmp(qualifier->value(), "auto") == 0) { + var->mode = ir_var_auto; + } else if (strcmp(qualifier->value(), "in") == 0) { + var->mode = ir_var_in; + } else if (strcmp(qualifier->value(), "out") == 0) { + var->mode = ir_var_out; + } else if (strcmp(qualifier->value(), "inout") == 0) { + var->mode = ir_var_inout; + } else if (strcmp(qualifier->value(), "smooth") == 0) { + var->interpolation = ir_var_smooth; + } else if (strcmp(qualifier->value(), "flat") == 0) { + var->interpolation = ir_var_flat; + } else if (strcmp(qualifier->value(), "noperspective") == 0) { + var->interpolation = ir_var_noperspective; + } else { + ir_read_error(st, list, "unknown qualifier: %s", qualifier->value()); + delete var; + return NULL; + } + } + + // Add the variable to the symbol table + st->symbols->add_variable(var->name, var); + + return var; +} + + +static ir_if * +read_if(_mesa_glsl_parse_state *st, s_list *list, ir_loop *loop_ctx) +{ + void *ctx = st; + if (list->length() != 4) { + ir_read_error(st, list, "expected (if <condition> (<then> ...) " + "(<else> ...))"); + return NULL; + } + + s_expression *cond_expr = (s_expression*) list->subexpressions.head->next; + ir_rvalue *condition = read_rvalue(st, cond_expr); + if (condition == NULL) { + ir_read_error(st, NULL, "when reading condition of (if ...)"); + return NULL; + } + + s_expression *then_expr = (s_expression*) cond_expr->next; + s_expression *else_expr = (s_expression*) then_expr->next; + + ir_if *iff = new(ctx) ir_if(condition); + + read_instructions(st, &iff->then_instructions, then_expr, loop_ctx); + read_instructions(st, &iff->else_instructions, else_expr, loop_ctx); + if (st->error) { + delete iff; + iff = NULL; + } + return iff; +} + + +static ir_loop * +read_loop(_mesa_glsl_parse_state *st, s_list *list) +{ + void *ctx = st; + if (list->length() != 6) { + ir_read_error(st, list, "expected (loop <counter> <from> <to> " + "<increment> <body>)"); + return NULL; + } + + s_expression *count_expr = (s_expression*) list->subexpressions.head->next; + s_expression *from_expr = (s_expression*) count_expr->next; + s_expression *to_expr = (s_expression*) from_expr->next; + s_expression *inc_expr = (s_expression*) to_expr->next; + s_expression *body_expr = (s_expression*) inc_expr->next; + + // FINISHME: actually read the count/from/to fields. + + ir_loop *loop = new(ctx) ir_loop; + read_instructions(st, &loop->body_instructions, body_expr, loop); + if (st->error) { + delete loop; + loop = NULL; + } + return loop; +} + + +static ir_return * +read_return(_mesa_glsl_parse_state *st, s_list *list) +{ + void *ctx = st; + if (list->length() != 2) { + ir_read_error(st, list, "expected (return <rvalue>)"); + return NULL; + } + + s_expression *expr = (s_expression*) list->subexpressions.head->next; + + ir_rvalue *retval = read_rvalue(st, expr); + if (retval == NULL) { + ir_read_error(st, NULL, "when reading return value"); + return NULL; + } + + return new(ctx) ir_return(retval); +} + + +static ir_rvalue * +read_rvalue(_mesa_glsl_parse_state *st, s_expression *expr) +{ + s_list *list = SX_AS_LIST(expr); + if (list == NULL || list->subexpressions.is_empty()) + return NULL; + + s_symbol *tag = SX_AS_SYMBOL(list->subexpressions.get_head()); + if (tag == NULL) { + ir_read_error(st, expr, "expected rvalue tag"); + return NULL; + } + + ir_rvalue *rvalue = read_dereference(st, list); + if (rvalue != NULL || st->error) + return rvalue; + else if (strcmp(tag->value(), "swiz") == 0) { + rvalue = read_swizzle(st, list); + } else if (strcmp(tag->value(), "expression") == 0) { + rvalue = read_expression(st, list); + } else if (strcmp(tag->value(), "call") == 0) { + rvalue = read_call(st, list); + } else if (strcmp(tag->value(), "constant") == 0) { + rvalue = read_constant(st, list); + } else { + rvalue = read_texture(st, list); + if (rvalue == NULL && !st->error) + ir_read_error(st, expr, "unrecognized rvalue tag: %s", tag->value()); + } + + return rvalue; +} + +static ir_assignment * +read_assignment(_mesa_glsl_parse_state *st, s_list *list) +{ + void *ctx = st; + if (list->length() != 5) { + ir_read_error(st, list, "expected (assign <condition> (<write mask>) " + "<lhs> <rhs>)"); + return NULL; + } + + s_expression *cond_expr = (s_expression*) list->subexpressions.head->next; + s_list *mask_list = SX_AS_LIST(cond_expr->next); + s_expression *lhs_expr = (s_expression*) cond_expr->next->next; + s_expression *rhs_expr = (s_expression*) lhs_expr->next; + + ir_rvalue *condition = read_rvalue(st, cond_expr); + if (condition == NULL) { + ir_read_error(st, NULL, "when reading condition of assignment"); + return NULL; + } + + if (mask_list == NULL || mask_list->length() > 1) { + ir_read_error(st, mask_list, "expected () or (<write mask>)"); + return NULL; + } + + unsigned mask = 0; + if (mask_list->length() == 1) { + s_symbol *mask_symbol = SX_AS_SYMBOL(mask_list->subexpressions.head); + if (mask_symbol == NULL) { + ir_read_error(st, list, "expected a write mask; found non-symbol"); + return NULL; + } + + const char *mask_str = mask_symbol->value(); + unsigned mask_length = strlen(mask_str); + if (mask_length > 4) { + ir_read_error(st, list, "invalid write mask: %s", mask_str); + return NULL; + } + + const unsigned idx_map[] = { 3, 0, 1, 2 }; /* w=bit 3, x=0, y=1, z=2 */ + + for (unsigned i = 0; i < mask_length; i++) { + if (mask_str[i] < 'w' || mask_str[i] > 'z') { + ir_read_error(st, list, "write mask contains invalid character: %c", + mask_str[i]); + return NULL; + } + mask |= 1 << idx_map[mask_str[i] - 'w']; + } + } + + ir_dereference *lhs = read_dereference(st, lhs_expr); + if (lhs == NULL) { + ir_read_error(st, NULL, "when reading left-hand side of assignment"); + return NULL; + } + + ir_rvalue *rhs = read_rvalue(st, rhs_expr); + if (rhs == NULL) { + ir_read_error(st, NULL, "when reading right-hand side of assignment"); + return NULL; + } + + if (mask == 0 && (lhs->type->is_vector() || lhs->type->is_scalar())) { + ir_read_error(st, list, "non-zero write mask required."); + return NULL; + } + + return new(ctx) ir_assignment(lhs, rhs, condition, mask); +} + +static ir_call * +read_call(_mesa_glsl_parse_state *st, s_list *list) +{ + void *ctx = st; + if (list->length() != 3) { + ir_read_error(st, list, "expected (call <name> (<param> ...))"); + return NULL; + } + + s_symbol *name = SX_AS_SYMBOL(list->subexpressions.head->next); + s_list *params = SX_AS_LIST(name->next); + if (name == NULL || params == NULL) { + ir_read_error(st, list, "expected (call <name> (<param> ...))"); + return NULL; + } + + exec_list parameters; + + foreach_iter(exec_list_iterator, it, params->subexpressions) { + s_expression *expr = (s_expression*) it.get(); + ir_rvalue *param = read_rvalue(st, expr); + if (param == NULL) { + ir_read_error(st, list, "when reading parameter to function call"); + return NULL; + } + parameters.push_tail(param); + } + + ir_function *f = st->symbols->get_function(name->value()); + if (f == NULL) { + ir_read_error(st, list, "found call to undefined function %s", + name->value()); + return NULL; + } + + ir_function_signature *callee = f->matching_signature(¶meters); + if (callee == NULL) { + ir_read_error(st, list, "couldn't find matching signature for function " + "%s", name->value()); + return NULL; + } + + return new(ctx) ir_call(callee, ¶meters); +} + +static ir_expression * +read_expression(_mesa_glsl_parse_state *st, s_list *list) +{ + void *ctx = st; + const unsigned list_length = list->length(); + if (list_length < 4) { + ir_read_error(st, list, "expected (expression <type> <operator> " + "<operand> [<operand>])"); + return NULL; + } + + s_expression *type_expr = (s_expression*) list->subexpressions.head->next; + const glsl_type *type = read_type(st, type_expr); + if (type == NULL) + return NULL; + + /* Read the operator */ + s_symbol *op_sym = SX_AS_SYMBOL(type_expr->next); + if (op_sym == NULL) { + ir_read_error(st, list, "expected operator, found non-symbol"); + return NULL; + } + + ir_expression_operation op = ir_expression::get_operator(op_sym->value()); + if (op == (ir_expression_operation) -1) { + ir_read_error(st, list, "invalid operator: %s", op_sym->value()); + return NULL; + } + + /* Now that we know the operator, check for the right number of operands */ + if (ir_expression::get_num_operands(op) == 2) { + if (list_length != 5) { + ir_read_error(st, list, "expected (expression <type> %s <operand> " + " <operand>)", op_sym->value()); + return NULL; + } + } else { + if (list_length != 4) { + ir_read_error(st, list, "expected (expression <type> %s <operand>)", + op_sym->value()); + return NULL; + } + } + + s_expression *exp1 = (s_expression*) (op_sym->next); + ir_rvalue *arg1 = read_rvalue(st, exp1); + if (arg1 == NULL) { + ir_read_error(st, NULL, "when reading first operand of %s", + op_sym->value()); + return NULL; + } + + ir_rvalue *arg2 = NULL; + if (ir_expression::get_num_operands(op) == 2) { + s_expression *exp2 = (s_expression*) (exp1->next); + arg2 = read_rvalue(st, exp2); + if (arg2 == NULL) { + ir_read_error(st, NULL, "when reading second operand of %s", + op_sym->value()); + return NULL; + } + } + + return new(ctx) ir_expression(op, type, arg1, arg2); +} + +static ir_swizzle * +read_swizzle(_mesa_glsl_parse_state *st, s_list *list) +{ + if (list->length() != 3) { + ir_read_error(st, list, "expected (swiz <swizzle> <rvalue>)"); + return NULL; + } + + s_symbol *swiz = SX_AS_SYMBOL(list->subexpressions.head->next); + if (swiz == NULL) { + ir_read_error(st, list, "expected a valid swizzle; found non-symbol"); + return NULL; + } + + if (strlen(swiz->value()) > 4) { + ir_read_error(st, list, "expected a valid swizzle; found %s", + swiz->value()); + return NULL; + } + + s_expression *sub = (s_expression*) swiz->next; + if (sub == NULL) { + ir_read_error(st, list, "expected rvalue: (swizzle %s <rvalue>)", + swiz->value()); + return NULL; + } + + ir_rvalue *rvalue = read_rvalue(st, sub); + if (rvalue == NULL) + return NULL; + + ir_swizzle *ir = ir_swizzle::create(rvalue, swiz->value(), + rvalue->type->vector_elements); + if (ir == NULL) + ir_read_error(st, list, "invalid swizzle"); + + return ir; +} + +static ir_constant * +read_constant(_mesa_glsl_parse_state *st, s_list *list) +{ + void *ctx = st; + if (list->length() != 3) { + ir_read_error(st, list, "expected (constant <type> (...))"); + return NULL; + } + + s_expression *type_expr = (s_expression*) list->subexpressions.head->next; + const glsl_type *type = read_type(st, type_expr); + if (type == NULL) + return NULL; + + s_list *values = SX_AS_LIST(type_expr->next); + if (values == NULL) { + ir_read_error(st, list, "expected (constant <type> (...))"); + return NULL; + } + + if (type->is_array()) { + const unsigned elements_supplied = values->length(); + if (elements_supplied != type->length) { + ir_read_error(st, values, "expected exactly %u array elements, " + "given %u", type->length, elements_supplied); + return NULL; + } + + exec_list elements; + foreach_iter(exec_list_iterator, it, values->subexpressions) { + s_expression *expr = (s_expression *) it.get(); + s_list *elt = SX_AS_LIST(expr); + if (elt == NULL) { + ir_read_error(st, expr, "expected (constant ...) array element"); + return NULL; + } + + ir_constant *ir_elt = read_constant(st, elt); + if (ir_elt == NULL) + return NULL; + elements.push_tail(ir_elt); + } + return new(ctx) ir_constant(type, &elements); + } + + const glsl_type *const base_type = type->get_base_type(); + + ir_constant_data data = { { 0 } }; + + // Read in list of values (at most 16). + int k = 0; + foreach_iter(exec_list_iterator, it, values->subexpressions) { + if (k >= 16) { + ir_read_error(st, values, "expected at most 16 numbers"); + return NULL; + } + + s_expression *expr = (s_expression*) it.get(); + + if (base_type->base_type == GLSL_TYPE_FLOAT) { + s_number *value = SX_AS_NUMBER(expr); + if (value == NULL) { + ir_read_error(st, values, "expected numbers"); + return NULL; + } + data.f[k] = value->fvalue(); + } else { + s_int *value = SX_AS_INT(expr); + if (value == NULL) { + ir_read_error(st, values, "expected integers"); + return NULL; + } + + switch (base_type->base_type) { + case GLSL_TYPE_UINT: { + data.u[k] = value->value(); + break; + } + case GLSL_TYPE_INT: { + data.i[k] = value->value(); + break; + } + case GLSL_TYPE_BOOL: { + data.b[k] = value->value(); + break; + } + default: + ir_read_error(st, values, "unsupported constant type"); + return NULL; + } + } + ++k; + } + + return new(ctx) ir_constant(type, &data); +} + +static ir_dereference * +read_dereference(_mesa_glsl_parse_state *st, s_expression *expr) +{ + s_list *list = SX_AS_LIST(expr); + if (list == NULL || list->subexpressions.is_empty()) + return NULL; + + s_symbol *tag = SX_AS_SYMBOL(list->subexpressions.head); + assert(tag != NULL); + + if (strcmp(tag->value(), "var_ref") == 0) + return read_var_ref(st, list); + if (strcmp(tag->value(), "array_ref") == 0) + return read_array_ref(st, list); + if (strcmp(tag->value(), "record_ref") == 0) + return read_record_ref(st, list); + return NULL; +} + +static ir_dereference * +read_var_ref(_mesa_glsl_parse_state *st, s_list *list) +{ + void *ctx = st; + if (list->length() != 2) { + ir_read_error(st, list, "expected (var_ref <variable name>)"); + return NULL; + } + s_symbol *var_name = SX_AS_SYMBOL(list->subexpressions.head->next); + if (var_name == NULL) { + ir_read_error(st, list, "expected (var_ref <variable name>)"); + return NULL; + } + + ir_variable *var = st->symbols->get_variable(var_name->value()); + if (var == NULL) { + ir_read_error(st, list, "undeclared variable: %s", var_name->value()); + return NULL; + } + + return new(ctx) ir_dereference_variable(var); +} + +static ir_dereference * +read_array_ref(_mesa_glsl_parse_state *st, s_list *list) +{ + void *ctx = st; + if (list->length() != 3) { + ir_read_error(st, list, "expected (array_ref <rvalue> <index>)"); + return NULL; + } + + s_expression *subj_expr = (s_expression*) list->subexpressions.head->next; + ir_rvalue *subject = read_rvalue(st, subj_expr); + if (subject == NULL) { + ir_read_error(st, NULL, "when reading the subject of an array_ref"); + return NULL; + } + + s_expression *idx_expr = (s_expression*) subj_expr->next; + ir_rvalue *idx = read_rvalue(st, idx_expr); + return new(ctx) ir_dereference_array(subject, idx); +} + +static ir_dereference * +read_record_ref(_mesa_glsl_parse_state *st, s_list *list) +{ + void *ctx = st; + if (list->length() != 3) { + ir_read_error(st, list, "expected (record_ref <rvalue> <field>)"); + return NULL; + } + + s_expression *subj_expr = (s_expression*) list->subexpressions.head->next; + ir_rvalue *subject = read_rvalue(st, subj_expr); + if (subject == NULL) { + ir_read_error(st, NULL, "when reading the subject of a record_ref"); + return NULL; + } + + s_symbol *field = SX_AS_SYMBOL(subj_expr->next); + if (field == NULL) { + ir_read_error(st, list, "expected (record_ref ... <field name>)"); + return NULL; + } + return new(ctx) ir_dereference_record(subject, field->value()); +} + +static bool +valid_texture_list_length(ir_texture_opcode op, s_list *list) +{ + unsigned required_length = 7; + if (op == ir_txf) + required_length = 5; + else if (op == ir_tex) + required_length = 6; + + return list->length() == required_length; +} + +static ir_texture * +read_texture(_mesa_glsl_parse_state *st, s_list *list) +{ + void *ctx = st; + s_symbol *tag = SX_AS_SYMBOL(list->subexpressions.head); + assert(tag != NULL); + + ir_texture_opcode op = ir_texture::get_opcode(tag->value()); + if (op == (ir_texture_opcode) -1) + return NULL; + + if (!valid_texture_list_length(op, list)) { + ir_read_error(st, NULL, "invalid list size in (%s ...)", tag->value()); + return NULL; + } + + ir_texture *tex = new(ctx) ir_texture(op); + + // Read sampler (must be a deref) + s_expression *sampler_expr = (s_expression *) tag->next; + ir_dereference *sampler = read_dereference(st, sampler_expr); + if (sampler == NULL) { + ir_read_error(st, NULL, "when reading sampler in (%s ...)", tag->value()); + return NULL; + } + tex->set_sampler(sampler); + + // Read coordinate (any rvalue) + s_expression *coordinate_expr = (s_expression *) sampler_expr->next; + tex->coordinate = read_rvalue(st, coordinate_expr); + if (tex->coordinate == NULL) { + ir_read_error(st, NULL, "when reading coordinate in (%s ...)", + tag->value()); + return NULL; + } + + // Read texel offset, i.e. (0 0 0) + s_list *offset_list = SX_AS_LIST(coordinate_expr->next); + if (offset_list == NULL || offset_list->length() != 3) { + ir_read_error(st, offset_list, "expected (<int> <int> <int>)"); + return NULL; + } + s_int *offset_x = SX_AS_INT(offset_list->subexpressions.head); + s_int *offset_y = SX_AS_INT(offset_x->next); + s_int *offset_z = SX_AS_INT(offset_y->next); + if (offset_x == NULL || offset_y == NULL || offset_z == NULL) { + ir_read_error(st, offset_list, "expected (<int> <int> <int>)"); + return NULL; + } + tex->offsets[0] = offset_x->value(); + tex->offsets[1] = offset_y->value(); + tex->offsets[2] = offset_z->value(); + + if (op == ir_txf) { + s_expression *lod_expr = (s_expression *) offset_list->next; + tex->lod_info.lod = read_rvalue(st, lod_expr); + if (tex->lod_info.lod == NULL) { + ir_read_error(st, NULL, "when reading LOD in (txf ...)"); + return NULL; + } + } else { + s_expression *proj_expr = (s_expression *) offset_list->next; + s_int *proj_as_int = SX_AS_INT(proj_expr); + if (proj_as_int && proj_as_int->value() == 1) { + tex->projector = NULL; + } else { + tex->projector = read_rvalue(st, proj_expr); + if (tex->projector == NULL) { + ir_read_error(st, NULL, "when reading projective divide in (%s ..)", + tag->value()); + return NULL; + } + } + + s_list *shadow_list = SX_AS_LIST(proj_expr->next); + if (shadow_list == NULL) { + ir_read_error(st, NULL, "shadow comparitor must be a list"); + return NULL; + } + if (shadow_list->subexpressions.is_empty()) { + tex->shadow_comparitor= NULL; + } else { + tex->shadow_comparitor = read_rvalue(st, shadow_list); + if (tex->shadow_comparitor == NULL) { + ir_read_error(st, NULL, "when reading shadow comparitor in (%s ..)", + tag->value()); + return NULL; + } + } + s_expression *lod_expr = (s_expression *) shadow_list->next; + + switch (op) { + case ir_txb: + tex->lod_info.bias = read_rvalue(st, lod_expr); + if (tex->lod_info.bias == NULL) { + ir_read_error(st, NULL, "when reading LOD bias in (txb ...)"); + return NULL; + } + break; + case ir_txl: + tex->lod_info.lod = read_rvalue(st, lod_expr); + if (tex->lod_info.lod == NULL) { + ir_read_error(st, NULL, "when reading LOD in (txl ...)"); + return NULL; + } + break; + case ir_txd: { + s_list *lod_list = SX_AS_LIST(lod_expr); + if (lod_list->length() != 2) { + ir_read_error(st, lod_expr, "expected (dPdx dPdy) in (txd ...)"); + return NULL; + } + s_expression *dx_expr = (s_expression *) lod_list->subexpressions.head; + s_expression *dy_expr = (s_expression *) dx_expr->next; + + tex->lod_info.grad.dPdx = read_rvalue(st, dx_expr); + if (tex->lod_info.grad.dPdx == NULL) { + ir_read_error(st, NULL, "when reading dPdx in (txd ...)"); + return NULL; + } + tex->lod_info.grad.dPdy = read_rvalue(st, dy_expr); + if (tex->lod_info.grad.dPdy == NULL) { + ir_read_error(st, NULL, "when reading dPdy in (txd ...)"); + return NULL; + } + break; + } + default: + // tex doesn't have any extra parameters and txf was handled earlier. + break; + }; + } + return tex; +} |