diff options
Diffstat (limited to 'src/glsl/glsl_symbol_table.cpp')
| -rw-r--r-- | src/glsl/glsl_symbol_table.cpp | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/src/glsl/glsl_symbol_table.cpp b/src/glsl/glsl_symbol_table.cpp new file mode 100644 index 0000000000..76c440c342 --- /dev/null +++ b/src/glsl/glsl_symbol_table.cpp @@ -0,0 +1,160 @@ +/* -*- c++ -*- */ +/* + * 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 "glsl_symbol_table.h" + +class symbol_table_entry { +public: + /* Callers of this talloc-based new need not call delete. It's + * easier to just talloc_free 'ctx' (or any of its ancestors). */ + static void* operator new(size_t size, void *ctx) + { + void *entry = talloc_size(ctx, size); + assert(entry != NULL); + return entry; + } + + /* If the user *does* call delete, that's OK, we will just + * talloc_free in that case. Here, C++ will have already called the + * destructor so tell talloc not to do that again. */ + static void operator delete(void *table) + { + talloc_set_destructor(table, NULL); + talloc_free(table); + } + + symbol_table_entry(ir_variable *v) : v(v), f(0), t(0) {} + symbol_table_entry(ir_function *f) : v(0), f(f), t(0) {} + symbol_table_entry(const glsl_type *t, ir_function *f) : v(0), f(f), t(t) {} + + ir_variable *v; + ir_function *f; + const glsl_type *t; +}; + +glsl_symbol_table::glsl_symbol_table() +{ + this->language_version = 120; + this->table = _mesa_symbol_table_ctor(); + this->mem_ctx = talloc_init("symbol table entries"); +} + +glsl_symbol_table::~glsl_symbol_table() +{ + _mesa_symbol_table_dtor(table); + talloc_free(mem_ctx); +} + +void glsl_symbol_table::push_scope() +{ + _mesa_symbol_table_push_scope(table); +} + +void glsl_symbol_table::pop_scope() +{ + _mesa_symbol_table_pop_scope(table); +} + +bool glsl_symbol_table::name_declared_this_scope(const char *name) +{ + return _mesa_symbol_table_symbol_scope(table, -1, name) == 0; +} + +bool glsl_symbol_table::add_variable(const char *name, ir_variable *v) +{ + if (this->language_version == 110) { + /* In 1.10, functions and variables have separate namespaces. */ + symbol_table_entry *existing = get_entry(name); + if (name_declared_this_scope(name)) { + /* If there's already an existing function (not a constructor!) in + * the current scope, just update the existing entry to include 'v'. + */ + if (existing->v == NULL && existing->t == NULL) { + existing->v = v; + return true; + } + } else { + /* If not declared at this scope, add a new entry. But if an existing + * entry includes a function, propagate that to this block - otherwise + * the new variable declaration would shadow the function. + */ + symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(v); + if (existing != NULL) + entry->f = existing->f; + int added = _mesa_symbol_table_add_symbol(table, -1, name, entry); + assert(added == 0); + return true; + } + return false; + } + + /* 1.20+ rules: */ + symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(v); + return _mesa_symbol_table_add_symbol(table, -1, name, entry) == 0; +} + +bool glsl_symbol_table::add_type(const char *name, const glsl_type *t, + ir_function *constructor) +{ + symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(t, constructor); + return _mesa_symbol_table_add_symbol(table, -1, name, entry) == 0; +} + +bool glsl_symbol_table::add_function(const char *name, ir_function *f) +{ + if (this->language_version == 110 && name_declared_this_scope(name)) { + /* In 1.10, functions and variables have separate namespaces. */ + symbol_table_entry *existing = get_entry(name); + if (existing->f == NULL) { + existing->f = f; + return true; + } + } + symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(f); + return _mesa_symbol_table_add_symbol(table, -1, name, entry) == 0; +} + +ir_variable *glsl_symbol_table::get_variable(const char *name) +{ + symbol_table_entry *entry = get_entry(name); + return entry != NULL ? entry->v : NULL; +} + +const glsl_type *glsl_symbol_table::get_type(const char *name) +{ + symbol_table_entry *entry = get_entry(name); + return entry != NULL ? entry->t : NULL; +} + +ir_function *glsl_symbol_table::get_function(const char *name) +{ + symbol_table_entry *entry = get_entry(name); + return entry != NULL ? entry->f : NULL; +} + +symbol_table_entry *glsl_symbol_table::get_entry(const char *name) +{ + return (symbol_table_entry *) + _mesa_symbol_table_find_symbol(table, -1, name); +} |