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|
/*
//
// Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
This file contains the Yacc grammar for GLSL ES preprocessor expression.
IF YOU MODIFY THIS FILE YOU ALSO NEED TO RUN generate_parser.sh,
WHICH GENERATES THE GLSL ES preprocessor expression parser.
*/
%{
//
// Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// This file is auto-generated by generate_parser.sh. DO NOT EDIT!
#if defined(__GNUC__)
// Triggered by the auto-generated pplval variable.
#if !defined(__clang__) && ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#else
#pragma GCC diagnostic ignored "-Wuninitialized"
#endif
#elif defined(_MSC_VER)
#pragma warning(disable: 4065 4701 4702)
#endif
#include "ExpressionParser.h"
#if defined(_MSC_VER)
#include <malloc.h>
#else
#include <stdlib.h>
#endif
#include <cassert>
#include <sstream>
#include "DiagnosticsBase.h"
#include "Lexer.h"
#include "Token.h"
#if defined(_MSC_VER)
typedef __int64 YYSTYPE;
#else
#include <stdint.h>
typedef intmax_t YYSTYPE;
#endif // _MSC_VER
#define YYENABLE_NLS 0
#define YYLTYPE_IS_TRIVIAL 1
#define YYSTYPE_IS_TRIVIAL 1
#define YYSTYPE_IS_DECLARED 1
namespace {
struct Context
{
pp::Diagnostics* diagnostics;
pp::Lexer* lexer;
pp::Token* token;
int* result;
};
} // namespace
%}
%pure-parser
%name-prefix "pp"
%parse-param {Context *context}
%lex-param {Context *context}
%{
static int yylex(YYSTYPE* lvalp, Context* context);
static void yyerror(Context* context, const char* reason);
%}
%token TOK_CONST_INT
%left TOK_OP_OR
%left TOK_OP_AND
%left '|'
%left '^'
%left '&'
%left TOK_OP_EQ TOK_OP_NE
%left '<' '>' TOK_OP_LE TOK_OP_GE
%left TOK_OP_LEFT TOK_OP_RIGHT
%left '+' '-'
%left '*' '/' '%'
%right TOK_UNARY
%%
input
: expression {
*(context->result) = static_cast<int>($1);
YYACCEPT;
}
;
expression
: TOK_CONST_INT
| expression TOK_OP_OR expression {
$$ = $1 || $3;
}
| expression TOK_OP_AND expression {
$$ = $1 && $3;
}
| expression '|' expression {
$$ = $1 | $3;
}
| expression '^' expression {
$$ = $1 ^ $3;
}
| expression '&' expression {
$$ = $1 & $3;
}
| expression TOK_OP_NE expression {
$$ = $1 != $3;
}
| expression TOK_OP_EQ expression {
$$ = $1 == $3;
}
| expression TOK_OP_GE expression {
$$ = $1 >= $3;
}
| expression TOK_OP_LE expression {
$$ = $1 <= $3;
}
| expression '>' expression {
$$ = $1 > $3;
}
| expression '<' expression {
$$ = $1 < $3;
}
| expression TOK_OP_RIGHT expression {
$$ = $1 >> $3;
}
| expression TOK_OP_LEFT expression {
$$ = $1 << $3;
}
| expression '-' expression {
$$ = $1 - $3;
}
| expression '+' expression {
$$ = $1 + $3;
}
| expression '%' expression {
if ($3 == 0) {
std::ostringstream stream;
stream << $1 << " % " << $3;
std::string text = stream.str();
context->diagnostics->report(pp::Diagnostics::PP_DIVISION_BY_ZERO,
context->token->location,
text.c_str());
YYABORT;
} else {
$$ = $1 % $3;
}
}
| expression '/' expression {
if ($3 == 0) {
std::ostringstream stream;
stream << $1 << " / " << $3;
std::string text = stream.str();
context->diagnostics->report(pp::Diagnostics::PP_DIVISION_BY_ZERO,
context->token->location,
text.c_str());
YYABORT;
} else {
$$ = $1 / $3;
}
}
| expression '*' expression {
$$ = $1 * $3;
}
| '!' expression %prec TOK_UNARY {
$$ = ! $2;
}
| '~' expression %prec TOK_UNARY {
$$ = ~ $2;
}
| '-' expression %prec TOK_UNARY {
$$ = - $2;
}
| '+' expression %prec TOK_UNARY {
$$ = + $2;
}
| '(' expression ')' {
$$ = $2;
}
;
%%
int yylex(YYSTYPE *lvalp, Context *context)
{
int type = 0;
pp::Token *token = context->token;
switch (token->type)
{
case pp::Token::CONST_INT: {
unsigned int val = 0;
if (!token->uValue(&val))
{
context->diagnostics->report(pp::Diagnostics::PP_INTEGER_OVERFLOW,
token->location, token->text);
}
*lvalp = static_cast<YYSTYPE>(val);
type = TOK_CONST_INT;
break;
}
case pp::Token::OP_OR:
type = TOK_OP_OR;
break;
case pp::Token::OP_AND:
type = TOK_OP_AND;
break;
case pp::Token::OP_NE:
type = TOK_OP_NE;
break;
case pp::Token::OP_EQ:
type = TOK_OP_EQ;
break;
case pp::Token::OP_GE:
type = TOK_OP_GE;
break;
case pp::Token::OP_LE:
type = TOK_OP_LE;
break;
case pp::Token::OP_RIGHT:
type = TOK_OP_RIGHT;
break;
case pp::Token::OP_LEFT:
type = TOK_OP_LEFT;
break;
case '|':
case '^':
case '&':
case '>':
case '<':
case '-':
case '+':
case '%':
case '/':
case '*':
case '!':
case '~':
case '(':
case ')':
type = token->type;
break;
default:
break;
}
// Advance to the next token if the current one is valid.
if (type != 0)
context->lexer->lex(token);
return type;
}
void yyerror(Context *context, const char *reason)
{
context->diagnostics->report(pp::Diagnostics::PP_INVALID_EXPRESSION,
context->token->location,
reason);
}
namespace pp {
ExpressionParser::ExpressionParser(Lexer *lexer, Diagnostics *diagnostics)
: mLexer(lexer),
mDiagnostics(diagnostics)
{
}
bool ExpressionParser::parse(Token *token, int *result)
{
Context context;
context.diagnostics = mDiagnostics;
context.lexer = mLexer;
context.token = token;
context.result = result;
int ret = yyparse(&context);
switch (ret)
{
case 0:
case 1:
break;
case 2:
mDiagnostics->report(Diagnostics::PP_OUT_OF_MEMORY, token->location, "");
break;
default:
assert(false);
mDiagnostics->report(Diagnostics::PP_INTERNAL_ERROR, token->location, "");
break;
}
return ret == 0;
}
} // namespace pp
|
