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Code Issues Wiki Activity

Scalability of parsing nested template ids, bug 246079.

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This commit is contained in:
Markus Schorn 2008-11-12 10:01:07 +00:00
parent ab6e2bd18c
commit d9c2afbec2
2 changed files with 53 additions and 15 deletions
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35
core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2TemplateTests.java
View file

@ -3212,4 +3212,39 @@ public class AST2TemplateTests extends AST2BaseTest {
BindingAssertionHelper ba= new BindingAssertionHelper(getAboveComment(), true);
ba.assertNonProblem("x))", 1, ICPPVariable.class);
}
// template<typename T, typename U> class TL {};
// typedef int T;
// typedef
// TL<T, TL< T, TL< T, TL< T, TL<T,
// TL<T, TL< T, TL< T, TL< T, TL<T,
// TL<T, TL< T, TL< T, TL< T, TL<T,
// TL<T, TL< T, TL< T, TL< T, TL<T,
// TL<T, TL< T, TL< T, TL< T, TL<T,
// T
// > > > > >
// > > > > >
// > > > > >
// > > > > >
// > > > > >
// type;
public void testNestedArguments_246079() throws Throwable {
final Throwable[] th= {null};
Thread t= new Thread(){
@Override
public void run() {
try {
parseAndCheckBindings(getAboveComment(), ParserLanguage.CPP);
} catch (Throwable e) {
th[0]= e;
}
}
};
t.start();
t.join(4000);
assertFalse(t.isAlive());
if (th[0] != null)
throw th[0];
}
}

33
core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/GNUCPPSourceParser.java
View file

@ -304,28 +304,31 @@ public class GNUCPPSourceParser extends AbstractGNUSourceCodeParser {
if(typeId != null && (LT(1)==IToken.tCOMMA || LT(1)==IToken.tGT || LT(1)==IToken.tEOC)) {
// potentially a type-id - check for id-expression ambiguity
IToken typeIdEnd= mark();
backup(argStart);
try {
IASTExpression expression = assignmentExpression();
if(expression instanceof IASTIdExpression) {
IASTIdExpression idExpression= (IASTIdExpression) expression;
if(idExpression.getName() instanceof ICPPASTTemplateId) {
/*
* A template-id cannot be used in an id-expression as a template argument.
*
* 5.1-11 A template-id shall be used as an unqualified-id only as specified in
* 14.7.2, 14.7, and 14.5.4.
*/
throw backtrack;
}
// consider ambiguity with id-expressions, only:
IASTDeclSpecifier declspec= typeId.getDeclSpecifier();
if (!(declspec instanceof IASTNamedTypeSpecifier))
throw backtrack;
IASTName name= ((IASTNamedTypeSpecifier) declspec).getName();
if (!name.contains(typeId))
throw backtrack;
// A template-id cannot be used in an id-expression as a template argument
// 5.1-11 A template-id shall be used as an unqualified-id only as specified in
// 14.7.2, 14.7, and 14.5.4.
name= name.getLastName();
if (name instanceof ICPPASTTemplateId)
throw backtrack;
backup(argStart);
IASTExpression expression = assignmentExpression();
if (expression instanceof IASTIdExpression) {
if (mark() != typeIdEnd)
throw backtrack;
ICPPASTAmbiguousTemplateArgument ambiguity= createAmbiguousTemplateArgument();
ambiguity.addTypeId(typeId);
ambiguity.addIdExpression(idExpression);
ambiguity.addIdExpression((IASTIdExpression) expression);
list.add(ambiguity);
} else {
// prefer the typeId at this stage