src/compiler/glsl/glsl_symbol_table.cpp - platform/external/mesa3d - Git at Google

 /* -*- 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"
 #include "ast.h"

 class symbol_table_entry {
 public:
    DECLARE_LINEAR_ALLOC_CXX_OPERATORS(symbol_table_entry);

    bool add_interface(const glsl_type *i, enum ir_variable_mode mode)
    {
       const glsl_type **dest;

       switch (mode) {
       case ir_var_uniform:
          dest = &ibu;
          break;
       case ir_var_shader_storage:
          dest = &iss;
          break;
       case ir_var_shader_in:
          dest = &ibi;
          break;
       case ir_var_shader_out:
          dest = &ibo;
          break;
       default:
          assert(!"Unsupported interface variable mode!");
          return false;
       }

       if (*dest != NULL) {
          return false;
       } else {
          *dest = i;
          return true;
       }
    }

    const glsl_type *get_interface(enum ir_variable_mode mode)
    {
       switch (mode) {
       case ir_var_uniform:
          return ibu;
       case ir_var_shader_storage:
          return iss;
       case ir_var_shader_in:
          return ibi;
       case ir_var_shader_out:
          return ibo;
       default:
          assert(!"Unsupported interface variable mode!");
          return NULL;
       }
    }

    symbol_table_entry(ir_variable *v)               :
       v(v), f(0), t(0), ibu(0), iss(0), ibi(0), ibo(0), a(0) {}
    symbol_table_entry(ir_function *f)               :
       v(0), f(f), t(0), ibu(0), iss(0), ibi(0), ibo(0), a(0) {}
    symbol_table_entry(const glsl_type *t)           :
       v(0), f(0), t(t), ibu(0), iss(0), ibi(0), ibo(0), a(0) {}
    symbol_table_entry(const glsl_type *t, enum ir_variable_mode mode) :
       v(0), f(0), t(0), ibu(0), iss(0), ibi(0), ibo(0), a(0)
    {
       assert(t->is_interface());
       add_interface(t, mode);
    }
    symbol_table_entry(const class ast_type_specifier *a):
       v(0), f(0), t(0), ibu(0), iss(0), ibi(0), ibo(0), a(a) {}

    ir_variable *v;
    ir_function *f;
    const glsl_type *t;
    const glsl_type *ibu;
    const glsl_type *iss;
    const glsl_type *ibi;
    const glsl_type *ibo;
    const class ast_type_specifier *a;
 };

 glsl_symbol_table::glsl_symbol_table()
 {
    this->separate_function_namespace = false;
    this->table = _mesa_symbol_table_ctor();
    this->mem_ctx = ralloc_context(NULL);
    this->linalloc = linear_alloc_parent(this->mem_ctx, 0);
 }

 glsl_symbol_table::~glsl_symbol_table()
 {
    _mesa_symbol_table_dtor(table);
    ralloc_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, name) == 0;
 }

 bool glsl_symbol_table::add_variable(ir_variable *v)
 {
    assert(v->data.mode != ir_var_temporary);

    if (this->separate_function_namespace) {
       /* In 1.10, functions and variables have separate namespaces. */
       symbol_table_entry *existing = get_entry(v->name);
       if (name_declared_this_scope(v->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(linalloc) symbol_table_entry(v);
 	 if (existing != NULL)
 	    entry->f = existing->f;
 	 int added = _mesa_symbol_table_add_symbol(table, v->name, entry);
 	 assert(added == 0);
 	 (void)added;
 	 return true;
       }
       return false;
    }

    /* 1.20+ rules: */
    symbol_table_entry *entry = new(linalloc) symbol_table_entry(v);
    return _mesa_symbol_table_add_symbol(table, v->name, entry) == 0;
 }

 bool glsl_symbol_table::add_type(const char *name, const glsl_type *t)
 {
    symbol_table_entry *entry = new(linalloc) symbol_table_entry(t);
    return _mesa_symbol_table_add_symbol(table, name, entry) == 0;
 }

 bool glsl_symbol_table::add_interface(const char *name, const glsl_type *i,
                                       enum ir_variable_mode mode)
 {
    assert(i->is_interface());
    symbol_table_entry *entry = get_entry(name);
    if (entry == NULL) {
       symbol_table_entry *entry =
          new(linalloc) symbol_table_entry(i, mode);
       bool add_interface_symbol_result =
          _mesa_symbol_table_add_symbol(table, name, entry) == 0;
       assert(add_interface_symbol_result);
       return add_interface_symbol_result;
    } else {
       return entry->add_interface(i, mode);
    }
 }

 bool glsl_symbol_table::add_function(ir_function *f)
 {
    if (this->separate_function_namespace && name_declared_this_scope(f->name)) {
       /* In 1.10, functions and variables have separate namespaces. */
       symbol_table_entry *existing = get_entry(f->name);
       if ((existing->f == NULL) && (existing->t == NULL)) {
 	 existing->f = f;
 	 return true;
       }
    }
    symbol_table_entry *entry = new(linalloc) symbol_table_entry(f);
    return _mesa_symbol_table_add_symbol(table, f->name, entry) == 0;
 }

 bool glsl_symbol_table::add_default_precision_qualifier(const char *type_name,
                                                         int precision)
 {
    char *name = ralloc_asprintf(mem_ctx, "#default_precision_%s", type_name);

    ast_type_specifier *default_specifier = new(linalloc) ast_type_specifier(name);
    default_specifier->default_precision = precision;

    symbol_table_entry *entry =
       new(linalloc) symbol_table_entry(default_specifier);

    if (!get_entry(name))
       return _mesa_symbol_table_add_symbol(table, name, entry) == 0;

    return _mesa_symbol_table_replace_symbol(table, name, entry) == 0;
 }

 void glsl_symbol_table::add_global_function(ir_function *f)
 {
    symbol_table_entry *entry = new(linalloc) symbol_table_entry(f);
    int added = _mesa_symbol_table_add_global_symbol(table, f->name, entry);
    assert(added == 0);
    (void)added;
 }

 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;
 }

 const glsl_type *glsl_symbol_table::get_interface(const char *name,
                                                   enum ir_variable_mode mode)
 {
    symbol_table_entry *entry = get_entry(name);
    return entry != NULL ? entry->get_interface(mode) : NULL;
 }

 ir_function *glsl_symbol_table::get_function(const char *name)
 {
    symbol_table_entry *entry = get_entry(name);
    return entry != NULL ? entry->f : NULL;
 }

 int glsl_symbol_table::get_default_precision_qualifier(const char *type_name)
 {
    char *name = ralloc_asprintf(mem_ctx, "#default_precision_%s", type_name);
    symbol_table_entry *entry = get_entry(name);
    if (!entry)
       return ast_precision_none;
    return entry->a->default_precision;
 }

 symbol_table_entry *glsl_symbol_table::get_entry(const char *name)
 {
    return (symbol_table_entry *)
       _mesa_symbol_table_find_symbol(table, name);
 }

 void
 glsl_symbol_table::disable_variable(const char *name)
 {
    /* Ideally we would remove the variable's entry from the symbol table, but
     * that would be difficult.  Fortunately, since this is only used for
     * built-in variables, it won't be possible for the shader to re-introduce
     * the variable later, so all we really need to do is to make sure that
     * further attempts to access it using get_variable() will return NULL.
     */
    symbol_table_entry *entry = get_entry(name);
    if (entry != NULL) {
       entry->v = NULL;
    }
 }

 void
 glsl_symbol_table::replace_variable(const char *name,
                                     ir_variable *v)
 {
    symbol_table_entry *entry = get_entry(name);
    if (entry != NULL) {
       entry->v = v;
    }
 }
	/* -- 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"
	#include "ast.h"

	class symbol_table_entry {
	public:
	DECLARE_LINEAR_ALLOC_CXX_OPERATORS(symbol_table_entry);

	bool add_interface(const glsl_type *i, enum ir_variable_mode mode)
	{
	const glsl_type **dest;

	switch (mode) {
	case ir_var_uniform:
	dest = &ibu;
	break;
	case ir_var_shader_storage:
	dest = &iss;
	break;
	case ir_var_shader_in:
	dest = &ibi;
	break;
	case ir_var_shader_out:
	dest = &ibo;
	break;
	default:
	assert(!"Unsupported interface variable mode!");
	return false;
	}

	if (*dest != NULL) {
	return false;
	} else {
	*dest = i;
	return true;
	}
	}

	const glsl_type *get_interface(enum ir_variable_mode mode)
	{
	switch (mode) {
	case ir_var_uniform:
	return ibu;
	case ir_var_shader_storage:
	return iss;
	case ir_var_shader_in:
	return ibi;
	case ir_var_shader_out:
	return ibo;
	default:
	assert(!"Unsupported interface variable mode!");
	return NULL;
	}
	}

	symbol_table_entry(ir_variable *v) :
	v(v), f(0), t(0), ibu(0), iss(0), ibi(0), ibo(0), a(0) {}
	symbol_table_entry(ir_function *f) :
	v(0), f(f), t(0), ibu(0), iss(0), ibi(0), ibo(0), a(0) {}
	symbol_table_entry(const glsl_type *t) :
	v(0), f(0), t(t), ibu(0), iss(0), ibi(0), ibo(0), a(0) {}
	symbol_table_entry(const glsl_type *t, enum ir_variable_mode mode) :
	v(0), f(0), t(0), ibu(0), iss(0), ibi(0), ibo(0), a(0)
	{
	assert(t->is_interface());
	add_interface(t, mode);
	}
	symbol_table_entry(const class ast_type_specifier *a):
	v(0), f(0), t(0), ibu(0), iss(0), ibi(0), ibo(0), a(a) {}

	ir_variable *v;
	ir_function *f;
	const glsl_type *t;
	const glsl_type *ibu;
	const glsl_type *iss;
	const glsl_type *ibi;
	const glsl_type *ibo;
	const class ast_type_specifier *a;
	};

	glsl_symbol_table::glsl_symbol_table()
	{
	this->separate_function_namespace = false;
	this->table = _mesa_symbol_table_ctor();
	this->mem_ctx = ralloc_context(NULL);
	this->linalloc = linear_alloc_parent(this->mem_ctx, 0);
	}

	glsl_symbol_table::~glsl_symbol_table()
	{
	_mesa_symbol_table_dtor(table);
	ralloc_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, name) == 0;
	}

	bool glsl_symbol_table::add_variable(ir_variable *v)
	{
	assert(v->data.mode != ir_var_temporary);

	if (this->separate_function_namespace) {
	/* In 1.10, functions and variables have separate namespaces. */
	symbol_table_entry *existing = get_entry(v->name);
	if (name_declared_this_scope(v->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(linalloc) symbol_table_entry(v);
	if (existing != NULL)
	entry->f = existing->f;
	int added = _mesa_symbol_table_add_symbol(table, v->name, entry);
	assert(added == 0);
	(void)added;
	return true;
	}
	return false;
	}

	/* 1.20+ rules: */
	symbol_table_entry *entry = new(linalloc) symbol_table_entry(v);
	return _mesa_symbol_table_add_symbol(table, v->name, entry) == 0;
	}

	bool glsl_symbol_table::add_type(const char name, const glsl_type t)
	{
	symbol_table_entry *entry = new(linalloc) symbol_table_entry(t);
	return _mesa_symbol_table_add_symbol(table, name, entry) == 0;
	}

	bool glsl_symbol_table::add_interface(const char name, const glsl_type i,
	enum ir_variable_mode mode)
	{
	assert(i->is_interface());
	symbol_table_entry *entry = get_entry(name);
	if (entry == NULL) {
	symbol_table_entry *entry =
	new(linalloc) symbol_table_entry(i, mode);
	bool add_interface_symbol_result =
	_mesa_symbol_table_add_symbol(table, name, entry) == 0;
	assert(add_interface_symbol_result);
	return add_interface_symbol_result;
	} else {
	return entry->add_interface(i, mode);
	}
	}

	bool glsl_symbol_table::add_function(ir_function *f)
	{
	if (this->separate_function_namespace && name_declared_this_scope(f->name)) {
	/* In 1.10, functions and variables have separate namespaces. */
	symbol_table_entry *existing = get_entry(f->name);
	if ((existing->f == NULL) && (existing->t == NULL)) {
	existing->f = f;
	return true;
	}
	}
	symbol_table_entry *entry = new(linalloc) symbol_table_entry(f);
	return _mesa_symbol_table_add_symbol(table, f->name, entry) == 0;
	}

	bool glsl_symbol_table::add_default_precision_qualifier(const char *type_name,
	int precision)
	{
	char *name = ralloc_asprintf(mem_ctx, "#default_precision_%s", type_name);

	ast_type_specifier *default_specifier = new(linalloc) ast_type_specifier(name);
	default_specifier->default_precision = precision;

	symbol_table_entry *entry =
	new(linalloc) symbol_table_entry(default_specifier);

	if (!get_entry(name))
	return _mesa_symbol_table_add_symbol(table, name, entry) == 0;

	return _mesa_symbol_table_replace_symbol(table, name, entry) == 0;
	}

	void glsl_symbol_table::add_global_function(ir_function *f)
	{
	symbol_table_entry *entry = new(linalloc) symbol_table_entry(f);
	int added = _mesa_symbol_table_add_global_symbol(table, f->name, entry);
	assert(added == 0);
	(void)added;
	}

	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;
	}

	const glsl_type glsl_symbol_table::get_interface(const char name,
	enum ir_variable_mode mode)
	{
	symbol_table_entry *entry = get_entry(name);
	return entry != NULL ? entry->get_interface(mode) : NULL;
	}

	ir_function glsl_symbol_table::get_function(const char name)
	{
	symbol_table_entry *entry = get_entry(name);
	return entry != NULL ? entry->f : NULL;
	}

	int glsl_symbol_table::get_default_precision_qualifier(const char *type_name)
	{
	char *name = ralloc_asprintf(mem_ctx, "#default_precision_%s", type_name);
	symbol_table_entry *entry = get_entry(name);
	if (!entry)
	return ast_precision_none;
	return entry->a->default_precision;
	}

	symbol_table_entry glsl_symbol_table::get_entry(const char name)
	{
	return (symbol_table_entry *)
	_mesa_symbol_table_find_symbol(table, name);
	}

	void
	glsl_symbol_table::disable_variable(const char *name)
	{
	/* Ideally we would remove the variable's entry from the symbol table, but
	* that would be difficult. Fortunately, since this is only used for
	* built-in variables, it won't be possible for the shader to re-introduce
	* the variable later, so all we really need to do is to make sure that
	* further attempts to access it using get_variable() will return NULL.
	*/
	symbol_table_entry *entry = get_entry(name);
	if (entry != NULL) {
	entry->v = NULL;
	}
	}

	void
	glsl_symbol_table::replace_variable(const char *name,
	ir_variable *v)
	{
	symbol_table_entry *entry = get_entry(name);
	if (entry != NULL) {
	entry->v = v;
	}
	}