[clang] [clang] Fix parenthesized list initialization of arrays not working with `new` (PR #76976)
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Thu Jan 4 09:05:12 PST 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang
Author: Alan Zhao (alanzhao1)
<details>
<summary>Changes</summary>
This bug is caused by parenthesized list initialization not being implemented in `CodeGenFunction::EmitNewArrayInitializer(...)`.
Parenthesized list initialization of `struct`s with `operator new` already works in Clang and is not affected by this bug.
Additionally, fix the test new-delete.cpp as it incorrectly assumes that using parentheses with operator new to initialize arrays is illegal for C++ versions >= C++17.
Fixes #<!-- -->68198
---
Full diff: https://github.com/llvm/llvm-project/pull/76976.diff
5 Files Affected:
- (modified) clang/docs/ReleaseNotes.rst (+3)
- (modified) clang/lib/CodeGen/CGExprCXX.cpp (+10-7)
- (modified) clang/lib/Sema/SemaExprCXX.cpp (+3-3)
- (modified) clang/test/CodeGen/paren-list-agg-init.cpp (+72)
- (modified) clang/test/SemaCXX/new-delete.cpp (+10-10)
``````````diff
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index c7bf162426a68c..211fd62a1ee85f 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -844,6 +844,9 @@ Bug Fixes to C++ Support
- Fix crash when parsing nested requirement. Fixes:
(`#73112 <https://github.com/llvm/llvm-project/issues/73112>`_)
+- Clang now allows parenthesized initialization of arrays in `operator new[]`.
+ Fixes: (`#68198 <https://github.com/llvm/llvm-project/issues/68198>`_)
+
Bug Fixes to AST Handling
^^^^^^^^^^^^^^^^^^^^^^^^^
- Fixed an import failure of recursive friend class template.
diff --git a/clang/lib/CodeGen/CGExprCXX.cpp b/clang/lib/CodeGen/CGExprCXX.cpp
index 98ae56e2df8818..72c61bfb5ec344 100644
--- a/clang/lib/CodeGen/CGExprCXX.cpp
+++ b/clang/lib/CodeGen/CGExprCXX.cpp
@@ -1038,11 +1038,13 @@ void CodeGenFunction::EmitNewArrayInitializer(
return true;
};
+ const InitListExpr *ILE = dyn_cast<InitListExpr>(Init);
+ const CXXParenListInitExpr *CPLIE = dyn_cast<CXXParenListInitExpr>(Init);
// If the initializer is an initializer list, first do the explicit elements.
- if (const InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) {
+ if (ILE || CPLIE) {
// Initializing from a (braced) string literal is a special case; the init
// list element does not initialize a (single) array element.
- if (ILE->isStringLiteralInit()) {
+ if (ILE && ILE->isStringLiteralInit()) {
// Initialize the initial portion of length equal to that of the string
// literal. The allocation must be for at least this much; we emitted a
// check for that earlier.
@@ -1073,7 +1075,7 @@ void CodeGenFunction::EmitNewArrayInitializer(
return;
}
- InitListElements = ILE->getNumInits();
+ InitListElements = ILE ? ILE->getNumInits() : CPLIE->getInitExprs().size();
// If this is a multi-dimensional array new, we will initialize multiple
// elements with each init list element.
@@ -1101,7 +1103,8 @@ void CodeGenFunction::EmitNewArrayInitializer(
}
CharUnits StartAlign = CurPtr.getAlignment();
- for (unsigned i = 0, e = ILE->getNumInits(); i != e; ++i) {
+ ArrayRef<Expr *> InitExprs = ILE ? ILE->inits() : CPLIE->getInitExprs();
+ for (unsigned i = 0; i < InitExprs.size(); ++i) {
// Tell the cleanup that it needs to destroy up to this
// element. TODO: some of these stores can be trivially
// observed to be unnecessary.
@@ -1111,8 +1114,8 @@ void CodeGenFunction::EmitNewArrayInitializer(
// FIXME: If the last initializer is an incomplete initializer list for
// an array, and we have an array filler, we can fold together the two
// initialization loops.
- StoreAnyExprIntoOneUnit(*this, ILE->getInit(i),
- ILE->getInit(i)->getType(), CurPtr,
+ Expr *IE = InitExprs[i];
+ StoreAnyExprIntoOneUnit(*this, IE, IE->getType(), CurPtr,
AggValueSlot::DoesNotOverlap);
CurPtr = Address(Builder.CreateInBoundsGEP(
CurPtr.getElementType(), CurPtr.getPointer(),
@@ -1122,7 +1125,7 @@ void CodeGenFunction::EmitNewArrayInitializer(
}
// The remaining elements are filled with the array filler expression.
- Init = ILE->getArrayFiller();
+ Init = ILE ? ILE->getArrayFiller() : CPLIE->getArrayFiller();
// Extract the initializer for the individual array elements by pulling
// out the array filler from all the nested initializer lists. This avoids
diff --git a/clang/lib/Sema/SemaExprCXX.cpp b/clang/lib/Sema/SemaExprCXX.cpp
index 4ae04358d5df7c..71e420648ce7af 100644
--- a/clang/lib/Sema/SemaExprCXX.cpp
+++ b/clang/lib/Sema/SemaExprCXX.cpp
@@ -1947,11 +1947,11 @@ Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
}
static bool isLegalArrayNewInitializer(CXXNewInitializationStyle Style,
- Expr *Init) {
+ Expr *Init, bool IsCPlusPlus20) {
if (!Init)
return true;
if (ParenListExpr *PLE = dyn_cast<ParenListExpr>(Init))
- return PLE->getNumExprs() == 0;
+ return IsCPlusPlus20 || PLE->getNumExprs() == 0;
if (isa<ImplicitValueInitExpr>(Init))
return true;
else if (CXXConstructExpr *CCE = dyn_cast<CXXConstructExpr>(Init))
@@ -2403,7 +2403,7 @@ ExprResult Sema::BuildCXXNew(SourceRange Range, bool UseGlobal,
// Array 'new' can't have any initializers except empty parentheses.
// Initializer lists are also allowed, in C++11. Rely on the parser for the
// dialect distinction.
- if (ArraySize && !isLegalArrayNewInitializer(InitStyle, Initializer)) {
+ if (ArraySize && !isLegalArrayNewInitializer(InitStyle, Initializer, getLangOpts().CPlusPlus20)) {
SourceRange InitRange(Exprs.front()->getBeginLoc(),
Exprs.back()->getEndLoc());
Diag(StartLoc, diag::err_new_array_init_args) << InitRange;
diff --git a/clang/test/CodeGen/paren-list-agg-init.cpp b/clang/test/CodeGen/paren-list-agg-init.cpp
index 0e68beb5c37066..9618b6ddf14558 100644
--- a/clang/test/CodeGen/paren-list-agg-init.cpp
+++ b/clang/test/CodeGen/paren-list-agg-init.cpp
@@ -513,3 +513,75 @@ namespace gh61567 {
I(0);
}
}
+
+namespace gh68198 {
+ // CHECK: define {{.*}} void @{{.*foo25.*}} {
+ // CHECK-NEXT: entry
+ // CHECK-NEXT: [[ARR_8:%.*arr8.*]] = alloca ptr, align 8
+ // CHECK-NEXT: [[CALL_PTR:%.*]] = call noalias noundef nonnull ptr @_Znam(i64 noundef 8)
+ // CHECK-NEXT: store i32 1, ptr [[CALL_PTR]], align 4
+ // CHECK-NEXT: [[ARRAY_EXP_NEXT:%.*]] = getelementptr inbounds i32, ptr [[CALL_PTR]], i64 1
+ // CHECK-NEXT: store i32 2, ptr [[ARRAY_EXP_NEXT]], align 4
+ // CHECK-NEXT: [[ARRAY_EXP_NEXT1:%.*]] = getelementptr inbounds i32, ptr [[ARRAY_EXP_NEXT]], i64 1
+ // CHECK-NEXT: store ptr [[CALL_PTR]], ptr %arr8, align 8
+ // CHECK-NEXT: ret void
+ void foo25() {
+ int* arr8 = new int[](1, 2);
+ }
+
+ // CHECK: define {{.*}} void @{{.*foo26.*}} {
+ // CHECK-NEXT: entry
+ // CHECK-NEXT: [[ARR_9:%.*arr9.*]] = alloca ptr, align 8
+ // CHECK-NEXT: [[CALL_PTR:%.*]] = call noalias noundef nonnull ptr @_Znam(i64 noundef 16) #7
+ // CHECK-NEXT: store i32 1, ptr [[CALL_PTR]], align 4
+ // CHECK-NEXT: [[ARRAY_EXP_NEXT:%.*]] = getelementptr inbounds i32, ptr [[CALL_PTR]], i64 1
+ // CHECK-NEXT: store i32 2, ptr [[ARRAY_EXP_NEXT]], align 4
+ // CHECK-NEXT: [[ARRAY_EXP_NEXT1:%.*]] = getelementptr inbounds i32, ptr [[ARRAY_EXP_NEXT]], i64 1
+ // CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 4 [[ARRAY_EXP_NEXT1]], i8 0, i64 8, i1 false)
+ // CHECK-NEXT: store ptr [[CALL_PTR]], ptr [[ARR_9]], align 8
+ // CHECK-NEXT: ret void
+ void foo26() {
+ int* arr9 = new int[4](1, 2);
+ }
+
+ // CHECK: define {{.*}} void @{{.*foo27.*}} {
+ // CHECK-NEXT: entry
+ // CHECK-NEXT: [[ARR_10:%.*arr10.*]] = alloca ptr, align 8
+ // CHECK-NEXT: [[CALL_PTR]] = call noalias noundef nonnull ptr @_Znam(i64 noundef 16)
+ // CHECK-NEXT: [[ARRAYINIT_BEGIN:%.*]] = getelementptr inbounds [2 x i32], ptr [[CALL]], i64 0, i64 0
+ // CHECK-NEXT: store i32 1, ptr [[ARRAYINIT_BEGIN]], align 4
+ // CHECK-NEXT: [[ARRAYINIT_ELEMENT:%.*]] = getelementptr inbounds i32, ptr [[ARRAYINIT_BEGIN]], i64 1
+ // CHECK-NEXT: store i32 2, ptr [[ARRAYINIT_ELEMENT]], align 4
+ // CHECK-NEXT: [[ARRAY_EXP_NEXT:%.*]] = getelementptr inbounds [2 x i32], ptr %call, i64 1
+ // CHECK-NEXT: [[ARRAYINIT_BEGIN1:%.*]] = getelementptr inbounds [2 x i32], ptr [[ARRAY_EXP_NEXT]], i64 0, i64 0
+ // CHECK-NEXT: store i32 3, ptr [[ARRAYINIT_BEGIN1]], align 4
+ // CHECK-NEXT: [[ARRAYINIT_ELEMENT2:%.*]] = getelementptr inbounds i32, ptr [[ARRAYINIT_BEGIN1]], i64 1
+ // CHECK-NEXT: store i32 4, ptr [[ARRAYINIT_ELEMENT2]], align 4
+ // CHECK-NEXT: [[ARRAY_EXP_NEXT3:%.*]] = getelementptr inbounds [2 x i32], ptr [[ARRAY_EXP_NEXT]], i64 1
+ // CHECK-NEXT: store ptr [[CALL_PTR]], ptr [[ARR_10]], align 8
+ // CHECK-NEXT: ret void
+ void foo27() {
+ void* arr10 = new int[][2]({1, 2}, {3, 4});
+ }
+
+ // CHECK: define {{.*}} void @{{.*foo28.*}} {
+ // CHECK-NEXT: entry
+ // CHECK-NEXT: [[ARR_11:%.*arr11.*]] = alloca ptr, align 8
+ // CHECK-NEXT: [[CALL_PTR]] = call noalias noundef nonnull ptr @_Znam(i64 noundef 32)
+ // CHECK-NEXT: [[ARRAYINIT_BEGIN:%.*]] = getelementptr inbounds [2 x i32], ptr [[CALL]], i64 0, i64 0
+ // CHECK-NEXT: store i32 5, ptr [[ARRAYINIT_BEGIN]], align 4
+ // CHECK-NEXT: [[ARRAYINIT_ELEMENT:%.*]] = getelementptr inbounds i32, ptr [[ARRAYINIT_BEGIN]], i64 1
+ // CHECK-NEXT: store i32 6, ptr [[ARRAYINIT_ELEMENT]], align 4
+ // CHECK-NEXT: [[ARRAY_EXP_NEXT:%.*]] = getelementptr inbounds [2 x i32], ptr %call, i64 1
+ // CHECK-NEXT: [[ARRAYINIT_BEGIN1:%.*]] = getelementptr inbounds [2 x i32], ptr [[ARRAY_EXP_NEXT]], i64 0, i64 0
+ // CHECK-NEXT: store i32 7, ptr [[ARRAYINIT_BEGIN1]], align 4
+ // CHECK-NEXT: [[ARRAYINIT_ELEMENT2:%.*]] = getelementptr inbounds i32, ptr [[ARRAYINIT_BEGIN1]], i64 1
+ // CHECK-NEXT: store i32 8, ptr [[ARRAYINIT_ELEMENT2]], align 4
+ // CHECK-NEXT: [[ARRAY_EXP_NEXT3:%.*]] = getelementptr inbounds [2 x i32], ptr [[ARRAY_EXP_NEXT]], i64 1
+ // CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 4 [[ARRAY_EXP_NEXT3]], i8 0, i64 16, i1 false)
+ // CHECK-NEXT: store ptr [[CALL_PTR]], ptr [[ARR_11]], align 8
+ // CHECK-NEXT: ret void
+ void foo28() {
+ void* arr11 = new int[4][2]({5, 6}, {7, 8});
+ }
+}
diff --git a/clang/test/SemaCXX/new-delete.cpp b/clang/test/SemaCXX/new-delete.cpp
index 0270e42b7389fe..ec406260b6a391 100644
--- a/clang/test/SemaCXX/new-delete.cpp
+++ b/clang/test/SemaCXX/new-delete.cpp
@@ -1,7 +1,7 @@
-// RUN: %clang_cc1 -fsyntax-only -verify %s -triple=i686-pc-linux-gnu -Wno-new-returns-null -std=c++98
-// RUN: %clang_cc1 -fsyntax-only -verify %s -triple=i686-pc-linux-gnu -Wno-new-returns-null -std=c++11
-// RUN: %clang_cc1 -fsyntax-only -verify %s -triple=i686-pc-linux-gnu -Wno-new-returns-null -std=c++14
-// RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx17 %s -triple=i686-pc-linux-gnu -Wno-new-returns-null %std_cxx17-
+// RUN: %clang_cc1 -fsyntax-only -verify=expected,precxx20 %s -triple=i686-pc-linux-gnu -Wno-new-returns-null -std=c++11
+// RUN: %clang_cc1 -fsyntax-only -verify=expected,precxx20 %s -triple=i686-pc-linux-gnu -Wno-new-returns-null -std=c++14
+// RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx17,precxx20 %s -triple=i686-pc-linux-gnu -Wno-new-returns-null -std=c++17
+// RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx17 %s -triple=i686-pc-linux-gnu -Wno-new-returns-null -std=c++20
// FIXME Location is (frontend)
// cxx17-note@*:* {{candidate function not viable: requires 2 arguments, but 3 were provided}}
@@ -340,23 +340,23 @@ namespace PR5918 { // Look for template operator new overloads.
namespace Test1 {
void f() {
- (void)new int[10](1, 2); // expected-error {{array 'new' cannot have initialization arguments}}
+ (void)new int[10](1, 2); // precxx20-error {{array 'new' cannot have initialization arguments}}
typedef int T[10];
- (void)new T(1, 2); // expected-error {{array 'new' cannot have initialization arguments}}
+ (void)new T(1, 2); // precxx20-error {{array 'new' cannot have initialization arguments}}
}
template<typename T>
void g(unsigned i) {
- (void)new T[1](i); // expected-error {{array 'new' cannot have initialization arguments}}
+ (void)new T[1](i); // precxx20-error {{array 'new' cannot have initialization arguments}}
}
template<typename T>
void h(unsigned i) {
- (void)new T(i); // expected-error {{array 'new' cannot have initialization arguments}}
+ (void)new T(i); // precxx20-error {{array 'new' cannot have initialization arguments}}
}
template void h<unsigned>(unsigned);
-template void h<unsigned[10]>(unsigned); // expected-note {{in instantiation of function template specialization 'Test1::h<unsigned int[10]>' requested here}}
+template void h<unsigned[10]>(unsigned); // precxx20-note {{in instantiation of function template specialization 'Test1::h<unsigned int[10]>' requested here}}
}
@@ -556,7 +556,7 @@ namespace P12023 {
int main()
{
- CopyCounter* f = new CopyCounter[10](CopyCounter()); // expected-error {{cannot have initialization arguments}}
+ CopyCounter* f = new CopyCounter[10](CopyCounter()); // precxx20-error {{cannot have initialization arguments}}
return 0;
}
}
``````````
</details>
https://github.com/llvm/llvm-project/pull/76976
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