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Reduce backtracking when parsing ambiguous name ids.

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This commit is contained in:
Roberto Raggi
2009-10-20 15:29:00 +02:00
parent 3ed4a743c0
commit 18ef2f2615
1 changed files with 38 additions and 15 deletions
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53
src/shared/cplusplus/Parser.cpp
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@@ -58,10 +58,10 @@
#include <iostream>
#include <cassert>
using namespace CPlusPlus;
#define CPLUSPLUS_NO_DEBUG_RULE
using namespace CPlusPlus;
namespace {
class DebugRule {
@@ -3296,16 +3296,32 @@ bool Parser::parseNameId(NameAST *&name)
if (! parseName(name))
return false;
TemplateIdAST *template_id = name->asTemplateId();
if (LA() == T_LPAREN && template_id) {
QualifiedNameAST *qualified_name_id = name->asQualifiedName();
TemplateIdAST *template_id = 0;
if (qualified_name_id) {
if (NameAST *unqualified_name = qualified_name_id->unqualified_name)
template_id = unqualified_name->asTemplateId();
} else {
template_id = name->asTemplateId();
}
if (! template_id)
return true; // it's not a template-id, there's nothing to rewind.
else if (LA() == T_LPAREN) {
// a template-id followed by a T_LPAREN
if (TemplateArgumentListAST *template_arguments = template_id->template_arguments) {
if (! template_arguments->next && template_arguments->template_argument &&
template_arguments->template_argument->asBinaryExpression()) {
unsigned saved = cursor();
ExpressionAST *expr = 0;
bool blocked = blockErrors(true);
bool lookAtCastExpression = parseCastExpression(expr);
(void) blockErrors(blocked);
if (lookAtCastExpression) {
if (CastExpressionAST *cast_expression = expr->asCastExpression()) {
if (cast_expression->lparen_token && cast_expression->rparen_token
@@ -3322,20 +3338,27 @@ bool Parser::parseNameId(NameAST *&name)
}
}
if (LA() == T_COMMA || LA() == T_SEMICOLON ||
LA() == T_LBRACKET || LA() == T_LPAREN)
switch (LA()) {
case T_COMMA:
case T_SEMICOLON:
case T_LBRACKET:
case T_LPAREN:
return true;
else if (LA() == T_IDENTIFIER ||
LA() == T_STATIC_CAST ||
LA() == T_DYNAMIC_CAST ||
LA() == T_REINTERPRET_CAST ||
LA() == T_CONST_CAST ||
tok().isLiteral() ||
tok().isOperator())
{
case T_IDENTIFIER:
case T_STATIC_CAST:
case T_DYNAMIC_CAST:
case T_REINTERPRET_CAST:
case T_CONST_CAST:
rewind(start);
return parseName(name, false);
}
default:
if (tok().isLiteral() || tok().isOperator()) {
rewind(start);
return parseName(name, false);
}
} // switch
return true;
}