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Code Issues Wiki Activity

Bug 512297 - Decrease the template instantiation depth limit to 128

Browse source 
The previous limit of 256 was not sufficient to prevent stack
overflows in some cases.

Change-Id: Ied9171ed3020f2de7932fa9ee50780bd207d8707
This commit is contained in:
Nathan Ridge 2017-09-27 22:11:52 -04:00
parent 98e1153ba0
commit 89ebafa72e
2 changed files with 31 additions and 1 deletions
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30
core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2TemplateTests.java
View file

@ -10434,4 +10434,34 @@ public class AST2TemplateTests extends AST2CPPTestBase {
assertNotNull(problem);
assertEquals(IProblem.TEMPLATE_ARGUMENT_NESTING_DEPTH_LIMIT_EXCEEDED, problem.getID());
}
// template<class... Ts>
// struct infinite;
//
// template<class Infinite, int N>
// struct infinite_generator {
// typedef infinite<typename infinite_generator<Infinite, N-1>::type> type;
// };
//
// template<class Infinite>
// struct infinite_generator<Infinite, 0> {
// typedef Infinite type;
// };
//
// template<class... Ts>
// struct infinite {
// typedef infinite<Ts...> self_type;
//
// template<int N>
// static typename infinite_generator<self_type, N>::type generate() {
// return typename infinite_generator<self_type, N>::type();
// }
// };
//
// auto parser_killer_2 = infinite<int>::generate<400>();
public void testTemplateInstantiationDepthLimit_512297() throws Exception {
CPPASTNameBase.sAllowRecursionBindings = true;
BindingAssertionHelper helper = getAssertionHelper();
helper.assertProblem("generate<400>", "generate<400>");
}
}

2
core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPTemplates.java
View file

@ -227,7 +227,7 @@ public class CPPTemplates {
static enum TypeSelection { PARAMETERS, RETURN_TYPE, PARAMETERS_AND_RETURN_TYPE }
// Infrastructure to protect against rogue template metaprograms that don't terminate.
private static final int TEMPLATE_INSTANTIATION_DEPTH_LIMIT = 256;
private static final int TEMPLATE_INSTANTIATION_DEPTH_LIMIT = 128;
private static final ThreadLocal<Integer> fTemplateInstantiationDepth = new ThreadLocal<Integer>() {
@Override
protected Integer initialValue() {