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Reapply "[Clang][Sema] placement new initializes typedef array with correct size (#83124)" #89036

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Merged
merged 8 commits into from
Apr 23, 2024
Merged

Reapply "[Clang][Sema] placement new initializes typedef array with correct size (#83124)" #89036

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56c2b4f
[Clang][Sema] placement new initializes typedef array with correct si…
mahtohappy Apr 16, 2024
bdd7f66
[Clang][Sema] placement new initializes typedef array with correct si…
mahtohappy Apr 16, 2024
71f00c3
Fix test from #83124 and #88902
erichkeane Apr 16, 2024
c64cd9d
[Clang][Sema] placement new initializes typedef array with correct size
mahtohappy Apr 17, 2024
1a73ca6
Reapply "[Clang][Sema] placement new initializes typedef array with c…
mahtohappy Apr 18, 2024
f95562d
Merge branch 'main' into temp_new
mahtohappy Apr 18, 2024
0f14d8f
Merge branch 'main' into temp_new
mahtohappy Apr 19, 2024
c9fbaf3
build trigger
mahtohappy Apr 21, 2024
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1 change: 1 addition & 0 deletions clang/docs/ReleaseNotes.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -534,6 +534,7 @@ Bug Fixes to C++ Support
Fixes (#GH70604), (#GH79754), (#GH84163), (#GH84425), (#GH86054), (#GH86398), and (#GH86399).
- Fix a crash when deducing ``auto`` from an invalid dereference (#GH88329).
- Fix a crash in requires expression with templated base class member function. Fixes (#GH84020).
- Fix placement new initializes typedef array with correct size. Fixes (#GH41441).

Bug Fixes to AST Handling
^^^^^^^^^^^^^^^^^^^^^^^^^
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14 changes: 13 additions & 1 deletion clang/lib/Sema/TreeTransform.h
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Expand Up @@ -12864,6 +12864,19 @@ TreeTransform<Derived>::TransformCXXNewExpr(CXXNewExpr *E) {
ArraySize = NewArraySize.get();
}

// Per C++0x [expr.new]p5, the type being constructed may be a
// typedef of an array type.
QualType AllocType = AllocTypeInfo->getType();
if (ArraySize) {
if (const ConstantArrayType *Array =
SemaRef.Context.getAsConstantArrayType(AllocType)) {
ArraySize = IntegerLiteral::Create(SemaRef.Context, Array->getSize(),
SemaRef.Context.getSizeType(),
E->getBeginLoc());
AllocType = Array->getElementType();
}
}

// Transform the placement arguments (if any).
bool ArgumentChanged = false;
SmallVector<Expr*, 8> PlacementArgs;
Expand Down Expand Up @@ -12925,7 +12938,6 @@ TreeTransform<Derived>::TransformCXXNewExpr(CXXNewExpr *E) {
return E;
}

QualType AllocType = AllocTypeInfo->getType();
if (!ArraySize) {
// If no array size was specified, but the new expression was
// instantiated with an array type (e.g., "new T" where T is
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23 changes: 23 additions & 0 deletions clang/test/SemaCXX/PR41441.cpp
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@@ -0,0 +1,23 @@
// RUN: %clang --target=x86_64-pc-linux -S -fno-discard-value-names -emit-llvm -o - %s | FileCheck %s

namespace std {
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Tests STILL haven't changed from the original patch. Please add the regression to this test as well.

using size_t = decltype(sizeof(int));
};
void* operator new[](std::size_t, void*) noexcept;

// CHECK: call void @llvm.memset.p0.i64(ptr align 1 %x, i8 0, i64 8, i1 false)
// CHECK: call void @llvm.memset.p0.i64(ptr align 16 %x, i8 0, i64 32, i1 false)
template <typename TYPE>
void f()
{
typedef TYPE TArray[8];

TArray x;
new(&x) TArray();
}

int main()
{
f<char>();
f<int>();
}