diff options
| -rw-r--r-- | Makefile.am | 3 | ||||
| -rw-r--r-- | ir.h | 1 | ||||
| -rw-r--r-- | ir_constant_expression.cpp | 191 |
3 files changed, 194 insertions, 1 deletions
diff --git a/Makefile.am b/Makefile.am index 9f5efa9e5d..c1c96ba2b9 100644 --- a/Makefile.am +++ b/Makefile.am @@ -27,7 +27,8 @@ glsl_SOURCES = symbol_table.c hash_table.c glsl_types.cpp \ glsl_parser.ypp glsl_lexer.lpp glsl_parser_extras.cpp \ ast_expr.cpp ast_to_hir.cpp ast_function.cpp ast_type.cpp \ ir.cpp hir_field_selection.cpp builtin_function.cpp \ - ir_print_visitor.cpp ir_variable.cpp ir_function.cpp + ir_print_visitor.cpp ir_variable.cpp ir_function.cpp \ + ir_constant_expression.cpp BUILT_SOURCES = glsl_parser.h builtin_types.h glsl_parser.cpp glsl_lexer.cpp CLEANFILES = $(BUILT_SOURCES) @@ -40,6 +40,7 @@ class ir_instruction : public exec_node { public: const struct glsl_type *type; + class ir_constant *constant_expression_value(); virtual void accept(ir_visitor *) = 0; /** diff --git a/ir_constant_expression.cpp b/ir_constant_expression.cpp new file mode 100644 index 0000000000..b8a9031fba --- /dev/null +++ b/ir_constant_expression.cpp @@ -0,0 +1,191 @@ +/* + * 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. + */ + +/** + * \file ir_constant_expression.cpp + * Evaluate and process constant valued expressions + * + * In GLSL, constant valued expressions are used in several places. These + * must be processed and evaluated very early in the compilation process. + * + * * Sizes of arrays + * * Initializers for uniforms + * * Initializers for \c const variables + */ + +#define NULL 0 +#include "ir.h" +#include "ir_visitor.h" + +/** + * Visitor class for evaluating constant expressions + */ +class ir_constant_visitor : public ir_visitor { +public: + ir_constant_visitor() + : value(NULL) + { + /* empty */ + } + + virtual ~ir_constant_visitor() + { + /* empty */ + } + + /** + * \name Visit methods + * + * As typical for the visitor pattern, there must be one \c visit method for + * each concrete subclass of \c ir_instruction. Virtual base classes within + * the hierarchy should not have \c visit methods. + */ + /*@{*/ + virtual void visit(ir_variable *); + virtual void visit(ir_label *); + virtual void visit(ir_function_signature *); + virtual void visit(ir_function *); + virtual void visit(ir_expression *); + virtual void visit(ir_swizzle *); + virtual void visit(ir_dereference *); + virtual void visit(ir_assignment *); + virtual void visit(ir_constant *); + virtual void visit(ir_call *); + virtual void visit(ir_return *); + virtual void visit(ir_if *); + /*@}*/ + + /** + * Value of the constant expression. + * + * \note + * This field will be \c NULL if the expression is not constant valued. + */ + /* FINIHSME: This cannot hold values for constant arrays or structures. */ + ir_constant *value; +}; + + +ir_constant * +ir_instruction::constant_expression_value() +{ + ir_constant_visitor visitor; + + this->accept(& visitor); + return visitor.value; +} + + +void +ir_constant_visitor::visit(ir_variable *ir) +{ + (void) ir; + value = NULL; +} + + +void +ir_constant_visitor::visit(ir_label *ir) +{ + (void) ir; + value = NULL; +} + + +void +ir_constant_visitor::visit(ir_function_signature *ir) +{ + (void) ir; + value = NULL; +} + + +void +ir_constant_visitor::visit(ir_function *ir) +{ + (void) ir; + value = NULL; +} + + +void +ir_constant_visitor::visit(ir_expression *ir) +{ + (void) ir; + value = NULL; +} + + +void +ir_constant_visitor::visit(ir_swizzle *ir) +{ + (void) ir; + value = NULL; +} + + +void +ir_constant_visitor::visit(ir_dereference *ir) +{ + (void) ir; + value = NULL; +} + + +void +ir_constant_visitor::visit(ir_assignment *ir) +{ + (void) ir; + value = NULL; +} + + +void +ir_constant_visitor::visit(ir_constant *ir) +{ + value = ir; +} + + +void +ir_constant_visitor::visit(ir_call *ir) +{ + (void) ir; + value = NULL; +} + + +void +ir_constant_visitor::visit(ir_return *ir) +{ + (void) ir; + value = NULL; +} + + +void +ir_constant_visitor::visit(ir_if *ir) +{ + (void) ir; + value = NULL; +} |