351241c83e
CodeGen-level implementation. Instead of adding an attribute to clang's FunctionDecl, add the IR attribute directly. This means a module built with this flag is now compatible with code built without it and vice versa. This change also results in the 'noalias' attribute no longer being added to calls to operator new in the IR; it's now only added to the declaration. It also fixes a bug where we failed to add the attribute to the 'nothrow' versions (because we didn't implicitly declare them, there was no good time to inject a fake attribute). llvm-svn: 265728
72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
// RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-pc-win32 | FileCheck %s
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struct ClassWithoutDtor {
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char x;
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};
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void check_array_no_cookies() {
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// CHECK: define void @"\01?check_array_no_cookies@@YAXXZ"() [[NUW:#[0-9]+]]
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// CHECK: call i8* @"\01??_U@YAPAXI@Z"(i32 42)
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ClassWithoutDtor *array = new ClassWithoutDtor[42];
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// CHECK: call void @"\01??_V@YAXPAX@Z"(
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delete [] array;
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}
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struct ClassWithDtor {
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char x;
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~ClassWithDtor() {}
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};
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void check_array_cookies_simple() {
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// CHECK: define {{.*}} @"\01?check_array_cookies_simple@@YAXXZ"()
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ClassWithDtor *array = new ClassWithDtor[42];
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// CHECK: [[ALLOCATED:%.*]] = call i8* @"\01??_U@YAPAXI@Z"(i32 46)
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// 46 = 42 + size of cookie (4)
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// CHECK: [[COOKIE:%.*]] = bitcast i8* [[ALLOCATED]] to i32*
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// CHECK: store i32 42, i32* [[COOKIE]]
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// CHECK: [[ARRAY:%.*]] = getelementptr inbounds i8, i8* [[ALLOCATED]], i32 4
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// CHECK: bitcast i8* [[ARRAY]] to [[CLASS:%.*]]*
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delete [] array;
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// CHECK: [[ARRAY_AS_CHAR:%.*]] = bitcast [[CLASS]]* {{%.*}} to i8*
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// CHECK: getelementptr inbounds i8, i8* [[ARRAY_AS_CHAR]], i32 -4
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}
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struct __attribute__((aligned(8))) ClassWithAlignment {
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// FIXME: replace __attribute__((aligned(8))) with __declspec(align(8)) once
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// http://llvm.org/bugs/show_bug.cgi?id=12631 is fixed.
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int *x, *y;
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~ClassWithAlignment() {}
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};
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void check_array_cookies_aligned() {
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// CHECK: define {{.*}} @"\01?check_array_cookies_aligned@@YAXXZ"()
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ClassWithAlignment *array = new ClassWithAlignment[42];
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// CHECK: [[ALLOCATED:%.*]] = call i8* @"\01??_U@YAPAXI@Z"(i32 344)
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// 344 = 42*8 + size of cookie (8, due to alignment)
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// CHECK: [[COOKIE:%.*]] = bitcast i8* [[ALLOCATED]] to i32*
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// CHECK: store i32 42, i32* [[COOKIE]]
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// CHECK: [[ARRAY:%.*]] = getelementptr inbounds i8, i8* [[ALLOCATED]], i32 8
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// CHECK: bitcast i8* [[ARRAY]] to [[CLASS:%.*]]*
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delete [] array;
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// CHECK: [[ARRAY_AS_CHAR:%.*]] = bitcast [[CLASS]]*
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// CHECK: getelementptr inbounds i8, i8* [[ARRAY_AS_CHAR]], i32 -8
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}
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namespace PR23990 {
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struct S {
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char x[42];
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void operator delete[](void *p, __SIZE_TYPE__);
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// CHECK-LABEL: define void @"\01?delete_s@PR23990@@YAXPAUS@1@@Z"(
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// CHECK: call void @"\01??_VS@PR23990@@SAXPAXI@Z"(i8* {{.*}}, i32 42)
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};
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void delete_s(S *s) { delete[] s; }
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}
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// CHECK: attributes [[NUW]] = { nounwind{{.*}} }
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