[clang] de7494a - [AST] fail rather than crash when const evaluating invalid c++ foreach
Sam McCall via cfe-commits
cfe-commits at lists.llvm.org
Wed Oct 27 13:45:43 PDT 2021
Author: Sam McCall
Date: 2021-10-27T22:45:32+02:00
New Revision: de7494a33a5c3152dd0ed24ea1c8b2760255f2f7
URL: https://github.com/llvm/llvm-project/commit/de7494a33a5c3152dd0ed24ea1c8b2760255f2f7
DIFF: https://github.com/llvm/llvm-project/commit/de7494a33a5c3152dd0ed24ea1c8b2760255f2f7.diff
LOG: [AST] fail rather than crash when const evaluating invalid c++ foreach
Differential Revision: https://reviews.llvm.org/D112633
Added:
Modified:
clang/lib/AST/ExprConstant.cpp
clang/test/SemaCXX/constexpr-function-recovery-crash.cpp
Removed:
################################################################################
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index c74e4c96f7b0..fa0d22064f0e 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -5319,6 +5319,11 @@ static EvalStmtResult EvaluateStmt(StmtResult &Result, EvalInfo &Info,
return ESR;
}
+ // In error-recovery cases it's possible to get here even if we failed to
+ // synthesize the __begin and __end variables.
+ if (!FS->getBeginStmt() || !FS->getEndStmt() || !FS->getCond())
+ return ESR_Failed;
+
// Create the __begin and __end iterators.
ESR = EvaluateStmt(Result, Info, FS->getBeginStmt());
if (ESR != ESR_Succeeded) {
diff --git a/clang/test/SemaCXX/constexpr-function-recovery-crash.cpp b/clang/test/SemaCXX/constexpr-function-recovery-crash.cpp
index 94be9a12bc66..4b73cff13838 100644
--- a/clang/test/SemaCXX/constexpr-function-recovery-crash.cpp
+++ b/clang/test/SemaCXX/constexpr-function-recovery-crash.cpp
@@ -69,3 +69,8 @@ constexpr int test9(int x) {
constexpr int test10() { return undef(); } // expected-error {{use of undeclared identifier 'undef'}}
static_assert(test10() <= 1, "should not crash"); // expected-error {{static_assert expression is not an integral constant expression}}
+
+struct X {} array[] = {undef()}; // expected-error {{use of undeclared identifier 'undef'}}
+constexpr void test11() {
+ for (X& e : array) {}
+}
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