tbaeder created this revision.
tbaeder added a reviewer: clang.
Herald added a project: All.
tbaeder requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.
Fixes https://github.com/llvm/llvm-project/issues/44176
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D157252
Files:
clang/lib/AST/ExprConstant.cpp
clang/test/Sema/builtin-memcpy.c
Index: clang/test/Sema/builtin-memcpy.c
===================================================================
--- /dev/null
+++ clang/test/Sema/builtin-memcpy.c
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 %s -fsyntax-only -verify
+
+/// Zero-sized structs should not crash.
+int b() {
+ struct { } a[10];
+ __builtin_memcpy(&a[2], a, 2); // expected-warning {{buffer has size 0, but
size argument is 2}}
+ return 0;
+}
Index: clang/lib/AST/ExprConstant.cpp
===================================================================
--- clang/lib/AST/ExprConstant.cpp
+++ clang/lib/AST/ExprConstant.cpp
@@ -9509,6 +9509,8 @@
// Figure out how many T's we're copying.
uint64_t TSize = Info.Ctx.getTypeSizeInChars(T).getQuantity();
+ if (TSize == 0)
+ return false;
if (!WChar) {
uint64_t Remainder;
llvm::APInt OrigN = N;
Index: clang/test/Sema/builtin-memcpy.c
===================================================================
--- /dev/null
+++ clang/test/Sema/builtin-memcpy.c
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 %s -fsyntax-only -verify
+
+/// Zero-sized structs should not crash.
+int b() {
+ struct { } a[10];
+ __builtin_memcpy(&a[2], a, 2); // expected-warning {{buffer has size 0, but size argument is 2}}
+ return 0;
+}
Index: clang/lib/AST/ExprConstant.cpp
===================================================================
--- clang/lib/AST/ExprConstant.cpp
+++ clang/lib/AST/ExprConstant.cpp
@@ -9509,6 +9509,8 @@
// Figure out how many T's we're copying.
uint64_t TSize = Info.Ctx.getTypeSizeInChars(T).getQuantity();
+ if (TSize == 0)
+ return false;
if (!WChar) {
uint64_t Remainder;
llvm::APInt OrigN = N;
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