45 lines · cpp
1// RUN: %clang_cc1 -fsyntax-only %s -std=c++142 3// Checks that Clang doesn't crash/assert on the nested call to "kaboom"4// in "bar()".5//6// This is an interesting test case for `ExprConstant.cpp`'s `CallStackFrame`7// because it triggers the following chain of events:8// 0. `CheckEnableIf` calls `EvaluateWithSubstitution`.9// 1. The outer call to "kaboom" gets evaluated.10// 2. The expr for "a" gets evaluated, it has a version X;11// a temporary with the key (a, X) is created.12// 3. The inner call to "kaboom" gets evaluated.13// 4. The expr for "a" gets evaluated, it has a version Y;14// a temporary with the key (a, Y) is created.15// 5. The expr for "b" gets evaluated, it has a version Y;16// a temporary with the key (b, Y) is created.17// 6. `EvaluateWithSubstitution` looks at "b" but cannot evaluate it18// because it's value-dependent (due to the call to "f.foo()").19//20// When `EvaluateWithSubstitution` bails out while evaluating the outer21// call, it attempts to fetch "b"'s param slot to clean it up.22//23// This used to cause an assertion failure in `getTemporary` because24// a temporary with the key "(b, Y)" (created at step 4) existed but25// not one for "(b, X)", which is what it was trying to fetch.26 27template<typename T>28__attribute__((enable_if(true, "")))29T kaboom(T a, T b) {30 return b;31}32 33struct A {34 double foo();35};36 37template <int>38struct B {39 A &f;40 41 void bar() {42 kaboom(kaboom(0.0, 1.0), f.foo());43 }44};45