aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/mesa/shader/slang/slang_preprocess.c
diff options
context:
space:
mode:
authormarha <marha@users.sourceforge.net>2010-04-12 09:53:17 +0000
committermarha <marha@users.sourceforge.net>2010-04-12 09:53:17 +0000
commit29b86f9852b2b7ecc31cdfee56679537e40bc6e2 (patch)
tree1e6ec8ccf2dbf773260a1953b8e13c49f9b7c5f5 /mesalib/src/mesa/shader/slang/slang_preprocess.c
parent529236591df7366479a6fac30b387667678fd1ba (diff)
downloadvcxsrv-29b86f9852b2b7ecc31cdfee56679537e40bc6e2.tar.gz
vcxsrv-29b86f9852b2b7ecc31cdfee56679537e40bc6e2.tar.bz2
vcxsrv-29b86f9852b2b7ecc31cdfee56679537e40bc6e2.zip
svn merge -r524:HEAD "^/branches/released" .
Diffstat (limited to 'mesalib/src/mesa/shader/slang/slang_preprocess.c')
-rw-r--r--mesalib/src/mesa/shader/slang/slang_preprocess.c1406
1 files changed, 0 insertions, 1406 deletions
diff --git a/mesalib/src/mesa/shader/slang/slang_preprocess.c b/mesalib/src/mesa/shader/slang/slang_preprocess.c
deleted file mode 100644
index e9a24cc00..000000000
--- a/mesalib/src/mesa/shader/slang/slang_preprocess.c
+++ /dev/null
@@ -1,1406 +0,0 @@
-/*
- * Mesa 3-D graphics library
- *
- * Copyright (C) 2005-2008 Brian Paul All Rights Reserved.
- * Copyright (C) 2009 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_preprocess.c
- * slang preprocessor
- * \author Michal Krol
- */
-
-#include "main/imports.h"
-#include "shader/grammar/grammar_mesa.h"
-#include "slang_preprocess.h"
-
-LONGSTRING static const char *slang_pp_directives_syn =
-#include "library/slang_pp_directives_syn.h"
-;
-
-LONGSTRING static const char *slang_pp_expression_syn =
-#include "library/slang_pp_expression_syn.h"
-;
-
-LONGSTRING static const char *slang_pp_version_syn =
-#include "library/slang_pp_version_syn.h"
-;
-
-static GLvoid
-grammar_error_to_log (slang_info_log *log)
-{
- char buf[1024];
- GLint pos;
-
- grammar_get_last_error ((byte *) (buf), sizeof (buf), &pos);
- if (buf[0] == 0) {
- _mesa_snprintf(buf, sizeof(buf), "Preprocessor error");
- }
- slang_info_log_error (log, buf);
-}
-
-GLboolean
-_slang_preprocess_version (const char *text, GLuint *version, GLuint *eaten, slang_info_log *log)
-{
- grammar id;
- byte *prod, *I;
- unsigned int size;
-
- id = grammar_load_from_text ((const byte *) (slang_pp_version_syn));
- if (id == 0) {
- grammar_error_to_log (log);
- return GL_FALSE;
- }
-
- if (!grammar_fast_check (id, (const byte *) (text), &prod, &size, 8)) {
- grammar_error_to_log (log);
- grammar_destroy (id);
- return GL_FALSE;
- }
-
- /* there can be multiple #version directives - grab the last one */
- I = &prod[size - 6];
- *version = (GLuint) (I[0]) + (GLuint) (I[1]) * 100;
- *eaten = (GLuint) (I[2]) + ((GLuint) (I[3]) << 8) + ((GLuint) (I[4]) << 16) + ((GLuint) (I[5]) << 24);
-
- grammar_destroy (id);
- grammar_alloc_free (prod);
- return GL_TRUE;
-}
-
-/*
- * The preprocessor does the following work.
- * 1. Remove comments. Each comment block is replaced with a single space and if the
- * block contains new-lines, they are preserved. This ensures that line numbers
- * stay the same and if a comment block delimits two tokens, the are delitmited
- * by the space after comment removal.
- * 2. Remove preprocessor directives from the source string, checking their syntax and
- * executing them if appropriate. Again, new-lines are preserved.
- * 3. Expand macros.
- * 4. Tokenize the source string by ensuring there is at least one space between every
- * two adjacent tokens.
- */
-
-#define PP_ANNOTATE 0
-
-static GLvoid
-pp_annotate (slang_string *output, const char *fmt, ...)
-{
-#if PP_ANNOTATE
- va_list va;
- char buffer[1024];
-
- va_start (va, fmt);
- _mesa_vsprintf (buffer, fmt, va);
- va_end (va);
- slang_string_pushs (output, buffer, _mesa_strlen (buffer));
-#else
- (GLvoid) (output);
- (GLvoid) (fmt);
-#endif
-}
-
- /*
- * The expression is executed on a fixed-sized stack. The PUSH macro makes a runtime
- * check if the stack is not overflown by too complex expressions. In that situation the
- * GLSL preprocessor should report internal compiler error.
- * The BINARYDIV makes a runtime check if the divider is not 0. If it is, it reports
- * compilation error.
- */
-
-#define EXECUTION_STACK_SIZE 1024
-
-#define PUSH(x)\
- do {\
- if (sp == 0) {\
- slang_info_log_error (elog, "internal compiler error: preprocessor execution stack overflow.");\
- return GL_FALSE;\
- }\
- stack[--sp] = x;\
- } while (GL_FALSE)
-
-#define POP(x)\
- do {\
- assert (sp < EXECUTION_STACK_SIZE);\
- x = stack[sp++];\
- } while (GL_FALSE)
-
-#define BINARY(op)\
- do {\
- GLint a, b;\
- POP(b);\
- POP(a);\
- PUSH(a op b);\
- } while (GL_FALSE)
-
-#define BINARYDIV(op)\
- do {\
- GLint a, b;\
- POP(b);\
- POP(a);\
- if (b == 0) {\
- slang_info_log_error (elog, "division by zero in preprocessor expression.");\
- return GL_FALSE;\
- }\
- PUSH(a op b);\
- } while (GL_FALSE)
-
-#define UNARY(op)\
- do {\
- GLint a;\
- POP(a);\
- PUSH(op a);\
- } while (GL_FALSE)
-
-#define OP_END 0
-#define OP_PUSHINT 1
-#define OP_LOGICALOR 2
-#define OP_LOGICALAND 3
-#define OP_OR 4
-#define OP_XOR 5
-#define OP_AND 6
-#define OP_EQUAL 7
-#define OP_NOTEQUAL 8
-#define OP_LESSEQUAL 9
-#define OP_GREATEREQUAL 10
-#define OP_LESS 11
-#define OP_GREATER 12
-#define OP_LEFTSHIFT 13
-#define OP_RIGHTSHIFT 14
-#define OP_ADD 15
-#define OP_SUBTRACT 16
-#define OP_MULTIPLY 17
-#define OP_DIVIDE 18
-#define OP_MODULUS 19
-#define OP_PLUS 20
-#define OP_MINUS 21
-#define OP_NEGATE 22
-#define OP_COMPLEMENT 23
-
-static GLboolean
-execute_expression (slang_string *output, const byte *code, GLuint *pi, GLint *result,
- slang_info_log *elog)
-{
- GLuint i = *pi;
- GLint stack[EXECUTION_STACK_SIZE];
- GLuint sp = EXECUTION_STACK_SIZE;
-
- while (code[i] != OP_END) {
- switch (code[i++]) {
- case OP_PUSHINT:
- i++;
- PUSH(_mesa_atoi ((const char *) (&code[i])));
- i += _mesa_strlen ((const char *) (&code[i])) + 1;
- break;
- case OP_LOGICALOR:
- BINARY(||);
- break;
- case OP_LOGICALAND:
- BINARY(&&);
- break;
- case OP_OR:
- BINARY(|);
- break;
- case OP_XOR:
- BINARY(^);
- break;
- case OP_AND:
- BINARY(&);
- break;
- case OP_EQUAL:
- BINARY(==);
- break;
- case OP_NOTEQUAL:
- BINARY(!=);
- break;
- case OP_LESSEQUAL:
- BINARY(<=);
- break;
- case OP_GREATEREQUAL:
- BINARY(>=);
- break;
- case OP_LESS:
- BINARY(<);
- break;
- case OP_GREATER:
- BINARY(>);
- break;
- case OP_LEFTSHIFT:
- BINARY(<<);
- break;
- case OP_RIGHTSHIFT:
- BINARY(>>);
- break;
- case OP_ADD:
- BINARY(+);
- break;
- case OP_SUBTRACT:
- BINARY(-);
- break;
- case OP_MULTIPLY:
- BINARY(*);
- break;
- case OP_DIVIDE:
- BINARYDIV(/);
- break;
- case OP_MODULUS:
- BINARYDIV(%);
- break;
- case OP_PLUS:
- UNARY(+);
- break;
- case OP_MINUS:
- UNARY(-);
- break;
- case OP_NEGATE:
- UNARY(!);
- break;
- case OP_COMPLEMENT:
- UNARY(~);
- break;
- default:
- assert (0);
- }
- }
-
- /* Write-back the index skipping the OP_END. */
- *pi = i + 1;
-
- /* There should be exactly one value left on the stack. This is our result. */
- POP(*result);
- pp_annotate (output, "%d ", *result);
- assert (sp == EXECUTION_STACK_SIZE);
- return GL_TRUE;
-}
-
-/*
- * Function execute_expressions() executes up to 2 expressions. The second expression is there
- * for the #line directive which takes 1 or 2 expressions that indicate line and file numbers.
- * If it fails, it returns 0. If it succeeds, it returns the number of executed expressions.
- */
-
-#define EXP_END 0
-#define EXP_EXPRESSION 1
-
-static GLuint
-execute_expressions (slang_string *output, grammar eid, const byte *expr, GLint results[2],
- slang_info_log *elog)
-{
- GLint success;
- byte *code;
- GLuint size, count = 0;
-
- success = grammar_fast_check (eid, expr, &code, &size, 64);
- if (success) {
- GLuint i = 0;
-
- while (code[i++] == EXP_EXPRESSION) {
- assert (count < 2);
-
- if (!execute_expression (output, code, &i, &results[count], elog)) {
- count = 0;
- break;
- }
- count++;
- }
- grammar_alloc_free (code);
- }
- else {
- slang_info_log_error (elog, "syntax error in preprocessor expression.");\
- }
- return count;
-}
-
-/*
- * The pp_symbol structure is used to hold macro definitions and macro formal parameters. The
- * pp_symbols strcture is a collection of pp_symbol. It is used both for storing macro formal
- * parameters and all global macro definitions. Making this unification wastes some memory,
- * becuse macro formal parameters don't need further lists of symbols. We lose 8 bytes per
- * formal parameter here, but making this we can use the same code to substitute macro parameters
- * as well as macros in the source string.
- */
-
-typedef struct
-{
- struct pp_symbol_ *symbols;
- GLuint count;
-} pp_symbols;
-
-static GLvoid
-pp_symbols_init (pp_symbols *self)
-{
- self->symbols = NULL;
- self->count = 0;
-}
-
-static GLvoid
-pp_symbols_free (pp_symbols *);
-
-typedef struct pp_symbol_
-{
- slang_string name;
- slang_string replacement;
- pp_symbols parameters;
-} pp_symbol;
-
-static GLvoid
-pp_symbol_init (pp_symbol *self)
-{
- slang_string_init (&self->name);
- slang_string_init (&self->replacement);
- pp_symbols_init (&self->parameters);
-}
-
-static GLvoid
-pp_symbol_free (pp_symbol *self)
-{
- slang_string_free (&self->name);
- slang_string_free (&self->replacement);
- pp_symbols_free (&self->parameters);
-}
-
-static GLvoid
-pp_symbol_reset (pp_symbol *self)
-{
- /* Leave symbol name intact. */
- slang_string_reset (&self->replacement);
- pp_symbols_free (&self->parameters);
- pp_symbols_init (&self->parameters);
-}
-
-static GLvoid
-pp_symbols_free (pp_symbols *self)
-{
- GLuint i;
-
- for (i = 0; i < self->count; i++)
- pp_symbol_free (&self->symbols[i]);
- _mesa_free (self->symbols);
-}
-
-static pp_symbol *
-pp_symbols_push (pp_symbols *self)
-{
- self->symbols = (pp_symbol *) (_mesa_realloc (self->symbols, self->count * sizeof (pp_symbol),
- (self->count + 1) * sizeof (pp_symbol)));
- if (self->symbols == NULL)
- return NULL;
- pp_symbol_init (&self->symbols[self->count]);
- return &self->symbols[self->count++];
-}
-
-static GLboolean
-pp_symbols_erase (pp_symbols *self, pp_symbol *symbol)
-{
- assert (symbol >= self->symbols && symbol < self->symbols + self->count);
-
- self->count--;
- pp_symbol_free (symbol);
- if (symbol < self->symbols + self->count)
- _mesa_memcpy (symbol, symbol + 1, sizeof (pp_symbol) * (self->symbols + self->count - symbol));
- self->symbols = (pp_symbol *) (_mesa_realloc (self->symbols, (self->count + 1) * sizeof (pp_symbol),
- self->count * sizeof (pp_symbol)));
- return self->symbols != NULL;
-}
-
-static pp_symbol *
-pp_symbols_find (pp_symbols *self, const char *name)
-{
- GLuint i;
-
- for (i = 0; i < self->count; i++)
- if (_mesa_strcmp (name, slang_string_cstr (&self->symbols[i].name)) == 0)
- return &self->symbols[i];
- return NULL;
-}
-
-/*
- * The condition context of a single #if/#else/#endif level. Those can be nested, so there
- * is a stack of condition contexts.
- * There is a special global context on the bottom of the stack. It is there to simplify
- * context handling.
- */
-
-typedef struct
-{
- GLboolean current; /* The condition value of this level. */
- GLboolean effective; /* The effective product of current condition, outer level conditions
- * and position within #if-#else-#endif sections. */
- GLboolean else_allowed; /* TRUE if in #if-#else section, FALSE if in #else-#endif section
- * and for global context. */
- GLboolean endif_required; /* FALSE for global context only. */
-} pp_cond_ctx;
-
-/* Should be enuff. */
-#define CONDITION_STACK_SIZE 64
-
-typedef struct
-{
- pp_cond_ctx stack[CONDITION_STACK_SIZE];
- pp_cond_ctx *top;
-} pp_cond_stack;
-
-static GLboolean
-pp_cond_stack_push (pp_cond_stack *self, slang_info_log *elog)
-{
- if (self->top == self->stack) {
- slang_info_log_error (elog, "internal compiler error: preprocessor condition stack overflow.");
- return GL_FALSE;
- }
- self->top--;
- return GL_TRUE;
-}
-
-static GLvoid
-pp_cond_stack_reevaluate (pp_cond_stack *self)
-{
- /* There must be at least 2 conditions on the stack - one global and one being evaluated. */
- assert (self->top <= &self->stack[CONDITION_STACK_SIZE - 2]);
-
- self->top->effective = self->top->current && self->top[1].effective;
-}
-
-
-/**
- * Extension enables through #extension directive.
- * NOTE: Currently, only enable/disable state is stored.
- */
-typedef struct
-{
- GLboolean ARB_draw_buffers;
- GLboolean ARB_texture_rectangle;
-} pp_ext;
-
-
-/**
- * Disable all extensions. Called at startup and on #extension all: disable.
- */
-static GLvoid
-pp_ext_disable_all(pp_ext *self)
-{
- _mesa_memset(self, 0, sizeof(self));
-}
-
-
-/**
- * Called during preprocessor initialization to set the initial enable/disable
- * state of extensions.
- */
-static GLvoid
-pp_ext_init(pp_ext *self, const struct gl_extensions *extensions)
-{
- pp_ext_disable_all (self);
- self->ARB_draw_buffers = GL_TRUE;
- if (extensions->NV_texture_rectangle)
- self->ARB_texture_rectangle = GL_TRUE;
-}
-
-/**
- * Called in response to #extension directives to enable/disable
- * the named extension.
- */
-static GLboolean
-pp_ext_set(pp_ext *self, const char *name, GLboolean enable)
-{
- if (_mesa_strcmp (name, "GL_ARB_draw_buffers") == 0)
- self->ARB_draw_buffers = enable;
- else if (_mesa_strcmp (name, "GL_ARB_texture_rectangle") == 0)
- self->ARB_texture_rectangle = enable;
- else
- return GL_FALSE;
- return GL_TRUE;
-}
-
-
-/**
- * Called in response to #pragma. For example, "#pragma debug(on)" would
- * call this function as pp_pragma("debug", "on").
- * \return GL_TRUE if pragma is valid, GL_FALSE if invalid
- */
-static GLboolean
-pp_pragma(struct gl_sl_pragmas *pragmas, const char *pragma, const char *param)
-{
-#if 0
- printf("#pragma %s %s\n", pragma, param);
-#endif
- if (_mesa_strcmp(pragma, "optimize") == 0) {
- if (!param)
- return GL_FALSE; /* missing required param */
- if (_mesa_strcmp(param, "on") == 0) {
- if (!pragmas->IgnoreOptimize)
- pragmas->Optimize = GL_TRUE;
- }
- else if (_mesa_strcmp(param, "off") == 0) {
- if (!pragmas->IgnoreOptimize)
- pragmas->Optimize = GL_FALSE;
- }
- else {
- return GL_FALSE; /* invalid param */
- }
- }
- else if (_mesa_strcmp(pragma, "debug") == 0) {
- if (!param)
- return GL_FALSE; /* missing required param */
- if (_mesa_strcmp(param, "on") == 0) {
- if (!pragmas->IgnoreDebug)
- pragmas->Debug = GL_TRUE;
- }
- else if (_mesa_strcmp(param, "off") == 0) {
- if (!pragmas->IgnoreDebug)
- pragmas->Debug = GL_FALSE;
- }
- else {
- return GL_FALSE; /* invalid param */
- }
- }
- /* all other pragmas are silently ignored */
- return GL_TRUE;
-}
-
-
-/**
- * The state of preprocessor: current line, file and version number, list
- * of all defined macros and the #if/#endif context.
- */
-typedef struct
-{
- GLint line;
- GLint file;
- GLint version;
- pp_symbols symbols;
- pp_ext ext;
- slang_info_log *elog;
- pp_cond_stack cond;
-} pp_state;
-
-static GLvoid
-pp_state_init (pp_state *self, slang_info_log *elog,
- const struct gl_extensions *extensions)
-{
- self->line = 0;
- self->file = 1;
-#if FEATURE_es2_glsl
- self->version = 100;
-#else
- self->version = 110;
-#endif
- pp_symbols_init (&self->symbols);
- pp_ext_init (&self->ext, extensions);
- self->elog = elog;
-
- /* Initialize condition stack and create the global context. */
- self->cond.top = &self->cond.stack[CONDITION_STACK_SIZE - 1];
- self->cond.top->current = GL_TRUE;
- self->cond.top->effective = GL_TRUE;
- self->cond.top->else_allowed = GL_FALSE;
- self->cond.top->endif_required = GL_FALSE;
-}
-
-static GLvoid
-pp_state_free (pp_state *self)
-{
- pp_symbols_free (&self->symbols);
-}
-
-#define IS_FIRST_ID_CHAR(x) (((x) >= 'a' && (x) <= 'z') || ((x) >= 'A' && (x) <= 'Z') || (x) == '_')
-#define IS_NEXT_ID_CHAR(x) (IS_FIRST_ID_CHAR(x) || ((x) >= '0' && (x) <= '9'))
-#define IS_WHITE(x) ((x) == ' ' || (x) == '\n')
-#define IS_NULL(x) ((x) == '\0')
-
-#define SKIP_WHITE(x) do { while (IS_WHITE(*(x))) (x)++; } while (GL_FALSE)
-
-typedef struct
-{
- slang_string *output;
- const char *input;
- pp_state *state;
-} expand_state;
-
-static GLboolean
-expand_defined (expand_state *e, slang_string *buffer)
-{
- GLboolean in_paren = GL_FALSE;
- const char *id;
-
- /* Parse the optional opening parenthesis. */
- SKIP_WHITE(e->input);
- if (*e->input == '(') {
- e->input++;
- in_paren = GL_TRUE;
- SKIP_WHITE(e->input);
- }
-
- /* Parse operand. */
- if (!IS_FIRST_ID_CHAR(*e->input)) {
- slang_info_log_error (e->state->elog,
- "preprocess error: identifier expected after operator 'defined'.");
- return GL_FALSE;
- }
- slang_string_reset (buffer);
- slang_string_pushc (buffer, *e->input++);
- while (IS_NEXT_ID_CHAR(*e->input))
- slang_string_pushc (buffer, *e->input++);
- id = slang_string_cstr (buffer);
-
- /* Check if the operand is defined. Output 1 if it is defined, output 0 if not. */
- if (pp_symbols_find (&e->state->symbols, id) == NULL)
- slang_string_pushs (e->output, " 0 ", 3);
- else
- slang_string_pushs (e->output, " 1 ", 3);
-
- /* Parse the closing parentehesis if the opening one was there. */
- if (in_paren) {
- SKIP_WHITE(e->input);
- if (*e->input != ')') {
- slang_info_log_error (e->state->elog, "preprocess error: ')' expected.");
- return GL_FALSE;
- }
- e->input++;
- SKIP_WHITE(e->input);
- }
- return GL_TRUE;
-}
-
-static GLboolean
-expand (expand_state *, pp_symbols *);
-
-static GLboolean
-expand_symbol (expand_state *e, pp_symbol *symbol)
-{
- expand_state es;
-
- /* If the macro has some parameters, we need to parse them. */
- if (symbol->parameters.count != 0) {
- GLuint i;
-
- /* Parse the opening parenthesis. */
- SKIP_WHITE(e->input);
- if (*e->input != '(') {
- slang_info_log_error (e->state->elog, "preprocess error: '(' expected.");
- return GL_FALSE;
- }
- e->input++;
- SKIP_WHITE(e->input);
-
- /* Parse macro actual parameters. This can be anything, separated by a colon.
- */
- for (i = 0; i < symbol->parameters.count; i++) {
- GLuint nested_paren_count = 0; /* track number of nested parentheses */
-
- if (*e->input == ')') {
- slang_info_log_error (e->state->elog, "preprocess error: unexpected ')'.");
- return GL_FALSE;
- }
-
- /* Eat all characters up to the comma or closing parentheses. */
- pp_symbol_reset (&symbol->parameters.symbols[i]);
- while (!IS_NULL(*e->input)) {
- /* Exit loop only when all nested parens have been eaten. */
- if (nested_paren_count == 0 && (*e->input == ',' || *e->input == ')'))
- break;
-
- /* Actually count nested parens here. */
- if (*e->input == '(')
- nested_paren_count++;
- else if (*e->input == ')')
- nested_paren_count--;
-
- slang_string_pushc (&symbol->parameters.symbols[i].replacement, *e->input++);
- }
-
- /* If it was not the last paremeter, skip the comma. Otherwise, skip the
- * closing parentheses. */
- if (i + 1 == symbol->parameters.count) {
- /* This is the last paremeter - skip the closing parentheses. */
- if (*e->input != ')') {
- slang_info_log_error (e->state->elog, "preprocess error: ')' expected.");
- return GL_FALSE;
- }
- e->input++;
- SKIP_WHITE(e->input);
- }
- else {
- /* Skip the separating comma. */
- if (*e->input != ',') {
- slang_info_log_error (e->state->elog, "preprocess error: ',' expected.");
- return GL_FALSE;
- }
- e->input++;
- SKIP_WHITE(e->input);
- }
- }
- }
-
- /* Expand the macro. Use its parameters as a priority symbol list to expand
- * macro parameters correctly. */
- es.output = e->output;
- es.input = slang_string_cstr (&symbol->replacement);
- es.state = e->state;
- slang_string_pushc (e->output, ' ');
- if (!expand (&es, &symbol->parameters))
- return GL_FALSE;
- slang_string_pushc (e->output, ' ');
- return GL_TRUE;
-}
-
-/*
- * Function expand() expands source text from <input> to <output>. The expansion is made using
- * the list passed in <symbols> parameter. It allows us to expand macro formal parameters with
- * actual parameters. The global list of symbols from pp state is used when doing a recursive
- * call of expand().
- */
-
-static GLboolean
-expand (expand_state *e, pp_symbols *symbols)
-{
- while (!IS_NULL(*e->input)) {
- if (IS_FIRST_ID_CHAR(*e->input)) {
- slang_string buffer;
- const char *id;
-
- /* Parse the identifier. */
- slang_string_init (&buffer);
- slang_string_pushc (&buffer, *e->input++);
- while (IS_NEXT_ID_CHAR(*e->input))
- slang_string_pushc (&buffer, *e->input++);
- id = slang_string_cstr (&buffer);
-
- /* Now check if the identifier is special in some way. The "defined" identifier is
- * actually an operator that we must handle here and expand it either to " 0 " or " 1 ".
- * The other identifiers start with "__" and we expand it to appropriate values
- * taken from the preprocessor state. */
- if (_mesa_strcmp (id, "defined") == 0) {
- if (!expand_defined (e, &buffer))
- return GL_FALSE;
- }
- else if (_mesa_strcmp (id, "__LINE__") == 0) {
- slang_string_pushc (e->output, ' ');
- slang_string_pushi (e->output, e->state->line);
- slang_string_pushc (e->output, ' ');
- }
- else if (_mesa_strcmp (id, "__FILE__") == 0) {
- slang_string_pushc (e->output, ' ');
- slang_string_pushi (e->output, e->state->file);
- slang_string_pushc (e->output, ' ');
- }
- else if (_mesa_strcmp (id, "__VERSION__") == 0) {
- slang_string_pushc (e->output, ' ');
- slang_string_pushi (e->output, e->state->version);
- slang_string_pushc (e->output, ' ');
- }
-#if FEATURE_es2_glsl
- else if (_mesa_strcmp (id, "GL_ES") == 0 ||
- _mesa_strcmp (id, "GL_FRAGMENT_PRECISION_HIGH") == 0) {
- slang_string_pushc (e->output, ' ');
- slang_string_pushi (e->output, '1');
- slang_string_pushc (e->output, ' ');
- }
-#endif
- else {
- pp_symbol *symbol;
-
- /* The list of symbols from <symbols> take precedence over the list from <state>.
- * Note that in some cases this is the same list so avoid double look-up. */
- symbol = pp_symbols_find (symbols, id);
- if (symbol == NULL && symbols != &e->state->symbols)
- symbol = pp_symbols_find (&e->state->symbols, id);
-
- /* If the symbol was found, recursively expand its definition. */
- if (symbol != NULL) {
- if (!expand_symbol (e, symbol)) {
- slang_string_free (&buffer);
- return GL_FALSE;
- }
- }
- else {
- slang_string_push (e->output, &buffer);
- }
- }
- slang_string_free (&buffer);
- }
- else if (IS_WHITE(*e->input)) {
- slang_string_pushc (e->output, *e->input++);
- }
- else {
- while (!IS_WHITE(*e->input) && !IS_NULL(*e->input) && !IS_FIRST_ID_CHAR(*e->input))
- slang_string_pushc (e->output, *e->input++);
- }
- }
- return GL_TRUE;
-}
-
-static GLboolean
-parse_if (slang_string *output, const byte *prod, GLuint *pi, GLint *result, pp_state *state,
- grammar eid)
-{
- const char *text;
- GLuint len;
-
- text = (const char *) (&prod[*pi]);
- len = _mesa_strlen (text);
-
- if (state->cond.top->effective) {
- slang_string expr;
- GLuint count;
- GLint results[2];
- expand_state es;
-
- /* Expand the expression. */
- slang_string_init (&expr);
- es.output = &expr;
- es.input = text;
- es.state = state;
- if (!expand (&es, &state->symbols))
- return GL_FALSE;
-
- /* Execute the expression. */
- count = execute_expressions (output, eid, (const byte *) (slang_string_cstr (&expr)),
- results, state->elog);
- slang_string_free (&expr);
- if (count != 1)
- return GL_FALSE;
- *result = results[0];
- }
- else {
- /* The directive is dead. */
- *result = 0;
- }
-
- *pi += len + 1;
- return GL_TRUE;
-}
-
-#define ESCAPE_TOKEN 0
-
-#define TOKEN_END 0
-#define TOKEN_DEFINE 1
-#define TOKEN_UNDEF 2
-#define TOKEN_IF 3
-#define TOKEN_ELSE 4
-#define TOKEN_ELIF 5
-#define TOKEN_ENDIF 6
-#define TOKEN_ERROR 7
-#define TOKEN_PRAGMA 8
-#define TOKEN_EXTENSION 9
-#define TOKEN_LINE 10
-
-#define PARAM_END 0
-#define PARAM_PARAMETER 1
-
-#define BEHAVIOR_REQUIRE 1
-#define BEHAVIOR_ENABLE 2
-#define BEHAVIOR_WARN 3
-#define BEHAVIOR_DISABLE 4
-
-#define PRAGMA_NO_PARAM 0
-#define PRAGMA_PARAM 1
-
-
-static GLboolean
-preprocess_source (slang_string *output, const char *source,
- grammar pid, grammar eid,
- slang_info_log *elog,
- const struct gl_extensions *extensions,
- struct gl_sl_pragmas *pragmas)
-{
- static const char *predefined[] = {
- "__FILE__",
- "__LINE__",
- "__VERSION__",
-#if FEATURE_es2_glsl
- "GL_ES",
- "GL_FRAGMENT_PRECISION_HIGH",
-#endif
- NULL
- };
- byte *prod;
- GLuint size, i;
- pp_state state;
-
- if (!grammar_fast_check (pid, (const byte *) (source), &prod, &size, 65536)) {
- grammar_error_to_log (elog);
- return GL_FALSE;
- }
-
- pp_state_init (&state, elog, extensions);
-
- /* add the predefined symbols to the symbol table */
- for (i = 0; predefined[i]; i++) {
- pp_symbol *symbol = NULL;
- symbol = pp_symbols_push(&state.symbols);
- assert(symbol);
- slang_string_pushs(&symbol->name,
- predefined[i], _mesa_strlen(predefined[i]));
- }
-
- i = 0;
- while (i < size) {
- if (prod[i] != ESCAPE_TOKEN) {
- if (state.cond.top->effective) {
- slang_string input;
- expand_state es;
-
- /* Eat only one line of source code to expand it.
- * FIXME: This approach has one drawback. If a macro with parameters spans across
- * multiple lines, the preprocessor will raise an error. */
- slang_string_init (&input);
- while (prod[i] != '\0' && prod[i] != '\n')
- slang_string_pushc (&input, prod[i++]);
- if (prod[i] != '\0')
- slang_string_pushc (&input, prod[i++]);
-
- /* Increment line number. */
- state.line++;
-
- es.output = output;
- es.input = slang_string_cstr (&input);
- es.state = &state;
- if (!expand (&es, &state.symbols))
- goto error;
-
- slang_string_free (&input);
- }
- else {
- /* Condition stack is disabled - keep track on line numbers and output only newlines. */
- if (prod[i] == '\n') {
- state.line++;
- /*pp_annotate (output, "%c", prod[i]);*/
- }
- else {
- /*pp_annotate (output, "%c", prod[i]);*/
- }
- i++;
- }
- }
- else {
- const char *id;
- GLuint idlen;
- GLubyte token;
-
- i++;
- token = prod[i++];
- switch (token) {
-
- case TOKEN_END:
- /* End of source string.
- * Check if all #ifs have been terminated by matching #endifs.
- * On condition stack there should be only the global condition context. */
- if (state.cond.top->endif_required) {
- slang_info_log_error (elog, "end of source without matching #endif.");
- return GL_FALSE;
- }
- break;
-
- case TOKEN_DEFINE:
- {
- pp_symbol *symbol = NULL;
-
- /* Parse macro name. */
- id = (const char *) (&prod[i]);
- idlen = _mesa_strlen (id);
- if (state.cond.top->effective) {
- pp_annotate (output, "// #define %s(", id);
-
- /* If the symbol is already defined, override it. */
- symbol = pp_symbols_find (&state.symbols, id);
- if (symbol == NULL) {
- symbol = pp_symbols_push (&state.symbols);
- if (symbol == NULL)
- goto error;
- slang_string_pushs (&symbol->name, id, idlen);
- }
- else {
- pp_symbol_reset (symbol);
- }
- }
- i += idlen + 1;
-
- /* Parse optional macro parameters. */
- while (prod[i++] != PARAM_END) {
- pp_symbol *param;
-
- id = (const char *) (&prod[i]);
- idlen = _mesa_strlen (id);
- if (state.cond.top->effective) {
- pp_annotate (output, "%s, ", id);
- param = pp_symbols_push (&symbol->parameters);
- if (param == NULL)
- goto error;
- slang_string_pushs (&param->name, id, idlen);
- }
- i += idlen + 1;
- }
-
- /* Parse macro replacement. */
- id = (const char *) (&prod[i]);
- idlen = _mesa_strlen (id);
- if (state.cond.top->effective) {
- slang_string replacement;
- expand_state es;
-
- pp_annotate (output, ") %s", id);
-
- slang_string_init(&replacement);
- slang_string_pushs(&replacement, id, idlen);
-
- /* Expand macro replacement. */
- es.output = &symbol->replacement;
- es.input = slang_string_cstr(&replacement);
- es.state = &state;
- if (!expand(&es, &state.symbols)) {
- slang_string_free(&replacement);
- goto error;
- }
- slang_string_free(&replacement);
- }
- i += idlen + 1;
- }
- break;
-
- case TOKEN_UNDEF:
- id = (const char *) (&prod[i]);
- i += _mesa_strlen (id) + 1;
- if (state.cond.top->effective) {
- pp_symbol *symbol;
-
- pp_annotate (output, "// #undef %s", id);
- /* Try to find symbol with given name and remove it. */
- symbol = pp_symbols_find (&state.symbols, id);
- if (symbol != NULL)
- if (!pp_symbols_erase (&state.symbols, symbol))
- goto error;
- }
- break;
-
- case TOKEN_IF:
- {
- GLint result;
-
- /* Parse #if expression end execute it. */
- pp_annotate (output, "// #if ");
- if (!parse_if (output, prod, &i, &result, &state, eid))
- goto error;
-
- /* Push new condition on the stack. */
- if (!pp_cond_stack_push (&state.cond, state.elog))
- goto error;
- state.cond.top->current = result ? GL_TRUE : GL_FALSE;
- state.cond.top->else_allowed = GL_TRUE;
- state.cond.top->endif_required = GL_TRUE;
- pp_cond_stack_reevaluate (&state.cond);
- }
- break;
-
- case TOKEN_ELSE:
- /* Check if #else is alloved here. */
- if (!state.cond.top->else_allowed) {
- slang_info_log_error (elog, "#else without matching #if.");
- goto error;
- }
-
- /* Negate current condition and reevaluate it. */
- state.cond.top->current = !state.cond.top->current;
- state.cond.top->else_allowed = GL_FALSE;
- pp_cond_stack_reevaluate (&state.cond);
- if (state.cond.top->effective)
- pp_annotate (output, "// #else");
- break;
-
- case TOKEN_ELIF:
- /* Check if #elif is alloved here. */
- if (!state.cond.top->else_allowed) {
- slang_info_log_error (elog, "#elif without matching #if.");
- goto error;
- }
-
- /* Negate current condition and reevaluate it. */
- state.cond.top->current = !state.cond.top->current;
- pp_cond_stack_reevaluate (&state.cond);
-
- if (state.cond.top->effective)
- pp_annotate (output, "// #elif ");
-
- {
- GLint result;
-
- /* Parse #elif expression end execute it. */
- if (!parse_if (output, prod, &i, &result, &state, eid))
- goto error;
-
- /* Update current condition and reevaluate it. */
- state.cond.top->current = result ? GL_TRUE : GL_FALSE;
- pp_cond_stack_reevaluate (&state.cond);
- }
- break;
-
- case TOKEN_ENDIF:
- /* Check if #endif is alloved here. */
- if (!state.cond.top->endif_required) {
- slang_info_log_error (elog, "#endif without matching #if.");
- goto error;
- }
-
- /* Pop the condition off the stack. */
- state.cond.top++;
- if (state.cond.top->effective)
- pp_annotate (output, "// #endif");
- break;
-
- case TOKEN_EXTENSION:
- /* Parse the extension name. */
- id = (const char *) (&prod[i]);
- i += _mesa_strlen (id) + 1;
- if (state.cond.top->effective)
- pp_annotate (output, "// #extension %s: ", id);
-
- /* Parse and apply extension behavior. */
- if (state.cond.top->effective) {
- switch (prod[i++]) {
-
- case BEHAVIOR_REQUIRE:
- pp_annotate (output, "require");
- if (!pp_ext_set (&state.ext, id, GL_TRUE)) {
- if (_mesa_strcmp (id, "all") == 0) {
- slang_info_log_error (elog, "require: bad behavior for #extension all.");
- goto error;
- }
- else {
- slang_info_log_error (elog, "%s: required extension is not supported.", id);
- goto error;
- }
- }
- break;
-
- case BEHAVIOR_ENABLE:
- pp_annotate (output, "enable");
- if (!pp_ext_set (&state.ext, id, GL_TRUE)) {
- if (_mesa_strcmp (id, "all") == 0) {
- slang_info_log_error (elog, "enable: bad behavior for #extension all.");
- goto error;
- }
- else {
- slang_info_log_warning (elog, "%s: enabled extension is not supported.", id);
- }
- }
- break;
-
- case BEHAVIOR_WARN:
- pp_annotate (output, "warn");
- if (!pp_ext_set (&state.ext, id, GL_TRUE)) {
- if (_mesa_strcmp (id, "all") != 0) {
- slang_info_log_warning (elog, "%s: enabled extension is not supported.", id);
- }
- }
- break;
-
- case BEHAVIOR_DISABLE:
- pp_annotate (output, "disable");
- if (!pp_ext_set (&state.ext, id, GL_FALSE)) {
- if (_mesa_strcmp (id, "all") == 0) {
- pp_ext_disable_all (&state.ext);
- }
- else {
- slang_info_log_warning (elog, "%s: disabled extension is not supported.", id);
- }
- }
- break;
-
- default:
- assert (0);
- }
- }
- break;
-
- case TOKEN_PRAGMA:
- {
- GLint have_param;
- const char *pragma, *param;
-
- pragma = (const char *) (&prod[i]);
- i += _mesa_strlen(pragma) + 1;
- have_param = (prod[i++] == PRAGMA_PARAM);
- if (have_param) {
- param = (const char *) (&prod[i]);
- i += _mesa_strlen(param) + 1;
- }
- else {
- param = NULL;
- }
- pp_pragma(pragmas, pragma, param);
- }
- break;
-
- case TOKEN_LINE:
- id = (const char *) (&prod[i]);
- i += _mesa_strlen (id) + 1;
-
- if (state.cond.top->effective) {
- slang_string buffer;
- GLuint count;
- GLint results[2];
- expand_state es;
-
- slang_string_init (&buffer);
- state.line++;
- es.output = &buffer;
- es.input = id;
- es.state = &state;
- if (!expand (&es, &state.symbols))
- goto error;
-
- pp_annotate (output, "// #line ");
- count = execute_expressions (output, eid,
- (const byte *) (slang_string_cstr (&buffer)),
- results, state.elog);
- slang_string_free (&buffer);
- if (count == 0)
- goto error;
-
- state.line = results[0] - 1;
- if (count == 2)
- state.file = results[1];
- }
- break;
- }
- }
- }
-
- /* Check for missing #endifs. */
- if (state.cond.top->endif_required) {
- slang_info_log_error (elog, "#endif expected but end of source found.");
- goto error;
- }
-
- grammar_alloc_free(prod);
- pp_state_free (&state);
- return GL_TRUE;
-
-error:
- grammar_alloc_free(prod);
- pp_state_free (&state);
- return GL_FALSE;
-}
-
-
-/**
- * Remove the continuation characters from the input string.
- * This is the very first step in preprocessing and is effective
- * even inside comment blocks.
- * If there is a whitespace between a backslash and a newline,
- * this is not considered as a line continuation.
- * \return GL_TRUE for success, GL_FALSE otherwise.
- */
-static GLboolean
-_slang_preprocess_backslashes(slang_string *output,
- const char *input)
-{
- while (*input) {
- if (input[0] == '\\') {
- /* If a newline follows, eat the backslash and the newline. */
- if (input[1] == '\r') {
- if (input[2] == '\n') {
- input += 3;
- } else {
- input += 2;
- }
- } else if (input[1] == '\n') {
- if (input[2] == '\r') {
- input += 3;
- } else {
- input += 2;
- }
- } else {
- /* Leave the backslash alone. */
- slang_string_pushc(output, *input++);
- }
- } else {
- slang_string_pushc(output, *input++);
- }
- }
- return GL_TRUE;
-}
-
-
-/**
- * Run preprocessor on source code.
- * \param extensions indicates which GL extensions are enabled
- * \param output the post-process results
- * \param input the input text
- * \param elog log to record warnings, errors
- * \param extensions out extension settings
- * \param pragmas in/out #pragma settings
- * \return GL_TRUE for success, GL_FALSE for error
- */
-GLboolean
-_slang_preprocess_directives(slang_string *output,
- const char *input,
- slang_info_log *elog,
- const struct gl_extensions *extensions,
- struct gl_sl_pragmas *pragmas)
-{
- grammar pid, eid;
- GLboolean success;
- slang_string without_backslashes;
-
- pid = grammar_load_from_text ((const byte *) (slang_pp_directives_syn));
- if (pid == 0) {
- grammar_error_to_log (elog);
- return GL_FALSE;
- }
- eid = grammar_load_from_text ((const byte *) (slang_pp_expression_syn));
- if (eid == 0) {
- grammar_error_to_log (elog);
- grammar_destroy (pid);
- return GL_FALSE;
- }
-
- slang_string_init(&without_backslashes);
- success = _slang_preprocess_backslashes(&without_backslashes, input);
-
- if (0) {
- _mesa_printf("Pre-processed shader:\n");
- _mesa_printf("%s", slang_string_cstr(&without_backslashes));
- _mesa_printf("----------------------\n");
- }
-
- if (success) {
- success = preprocess_source(output,
- slang_string_cstr(&without_backslashes),
- pid,
- eid,
- elog,
- extensions,
- pragmas);
- }
-
- slang_string_free(&without_backslashes);
- grammar_destroy (eid);
- grammar_destroy (pid);
-
- if (0) {
- _mesa_printf("Post-processed shader:\n");
- _mesa_printf("%s", slang_string_cstr(output));
- _mesa_printf("----------------------\n");
- }
-
- return success;
-}
-