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Use memoization to reduce the backtracking when parsing template arguments.

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This commit is contained in:
Roberto Raggi
2009-10-23 11:21:36 +02:00
parent 03e3a92806
commit 07c2451abd
2 changed files with 36 additions and 3 deletions
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25
src/shared/cplusplus/Parser.cpp
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@@ -328,8 +328,6 @@ bool Parser::parseTemplateId(NameAST *&node)
DEBUG_THIS_RULE();
const unsigned start = cursor();
Rewind rewind(this);
rewind.mark();
if (LA() == T_IDENTIFIER && LA(2) == T_LESS) {
TemplateIdAST *ast = new (_pool) TemplateIdAST;
@@ -692,8 +690,26 @@ bool Parser::parseOperatorFunctionId(NameAST *&node)
return true;
}
Parser::TemplateArgumentListEntry *Parser::templateArgumentListEntry(unsigned tokenIndex)
{
for (unsigned i = 0; i < _templateArgumentList.size(); ++i) {
TemplateArgumentListEntry *entry = &_templateArgumentList[i];
if (entry->index == tokenIndex)
return entry;
}
return 0;
}
bool Parser::parseTemplateArgumentList(TemplateArgumentListAST *&node)
{
if (TemplateArgumentListEntry *entry = templateArgumentListEntry(cursor())) {
rewind(entry->cursor);
return entry->ast;
}
unsigned start = cursor();
DEBUG_THIS_RULE();
TemplateArgumentListAST **template_argument_ptr = &node;
ExpressionAST *template_argument = 0;
@@ -711,8 +727,13 @@ bool Parser::parseTemplateArgumentList(TemplateArgumentListAST *&node)
template_argument_ptr = &(*template_argument_ptr)->next;
}
}
_templateArgumentList.push_back(TemplateArgumentListEntry(start, cursor(), node));
return true;
}
_templateArgumentList.push_back(TemplateArgumentListEntry(start, cursor(), 0));
return false;
}