[PATCH] D158595: [clang][Interp] Allow zero-ini of primitives with an empty init list
Timm Bäder via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Wed Aug 23 04:51:07 PDT 2023
tbaeder created this revision.
tbaeder added reviewers: aaron.ballman, erichkeane, shafik, cor3ntin.
Herald added a project: All.
tbaeder requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D158595
Files:
clang/lib/AST/Interp/ByteCodeExprGen.cpp
clang/test/AST/Interp/literals.cpp
Index: clang/test/AST/Interp/literals.cpp
===================================================================
--- clang/test/AST/Interp/literals.cpp
+++ clang/test/AST/Interp/literals.cpp
@@ -91,6 +91,15 @@
// ref-error {{not an integral constant expression}} \
// ref-note {{outside the range of representable values}} \
+namespace PrimitiveEmptyInitList {
+ constexpr int a = {};
+ static_assert(a == 0, "");
+ constexpr bool b = {};
+ static_assert(!b, "");
+ constexpr double d = {};
+ static_assert(d == 0.0, "");
+}
+
enum E {};
constexpr E e = static_cast<E>(0);
Index: clang/lib/AST/Interp/ByteCodeExprGen.cpp
===================================================================
--- clang/lib/AST/Interp/ByteCodeExprGen.cpp
+++ clang/lib/AST/Interp/ByteCodeExprGen.cpp
@@ -675,8 +675,10 @@
// Primitive values.
if (std::optional<PrimType> T = classify(E->getType())) {
- assert(E->getNumInits() == 1);
assert(!DiscardResult);
+ if (E->getNumInits() == 0)
+ return this->visitZeroInitializer(E->getType(), E);
+ assert(E->getNumInits() == 1);
return this->delegate(E->inits()[0]);
}
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