6ea383f58e
`initializeArrayCookie` calls `createPtrBitcast(ptr, u8PtrTy)` to get a byte pointer into the allocation. `createPtrBitcast` wraps its argument in `cir::PointerType`, so the result is `!cir.ptr<!cir.ptr<!u8i>>` instead of `!cir.ptr<!u8i>`. The subsequent `cir.ptr_stride` by 8 then advances by `8 * sizeof(ptr)` = 64 bytes instead of 8, placing the first array element at the wrong offset. `delete[]` reads garbage from the cookie and crashes with `free(): invalid pointer`. Fix: `createBitcast` instead of `createPtrBitcast`, and `u8Ty` instead of `u8PtrTy` in the `Address` constructor.
42 lines
1.8 KiB
C++
42 lines
1.8 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fclangir -emit-cir \
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// RUN: -std=c++14 -fcxx-exceptions -fexceptions %s -o %t.cir
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// RUN: FileCheck --check-prefix=CIR --input-file=%t.cir %s
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// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fclangir -emit-llvm \
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// RUN: -std=c++14 -fcxx-exceptions -fexceptions %s -o %t-cir.ll
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// RUN: FileCheck --check-prefix=LLVM --input-file=%t-cir.ll %s
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// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm \
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// RUN: -std=c++14 -fcxx-exceptions -fexceptions %s -o %t.ll
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// RUN: FileCheck --check-prefix=OGCG --input-file=%t.ll %s
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struct S {
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~S();
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int x;
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};
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// Array new with a non-trivial destructor requires a cookie to store
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// the element count. The cookie is 8 bytes (sizeof(size_t)) and the
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// data pointer must be advanced by 8 bytes past the allocation, not
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// by 8 * sizeof(ptr).
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S *allocArray(int n) {
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return new S[n];
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}
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// CIR-LABEL: @_Z10allocArrayi
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// CIR: %[[ALLOC:.*]] = cir.call @_Znam
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// CIR: %[[BYTE_PTR:.*]] = cir.cast bitcast %[[ALLOC]] : !cir.ptr<!void> -> !cir.ptr<!u8i>
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// CIR: %[[COOKIE_CAST:.*]] = cir.cast bitcast %[[BYTE_PTR]] : !cir.ptr<!u8i> -> !cir.ptr<!u64i>
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// CIR: cir.store {{.*}} %[[COOKIE_CAST]] : !u64i, !cir.ptr<!u64i>
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// CIR: %[[EIGHT:.*]] = cir.const #cir.int<8> : !s32i
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// CIR: %[[DATA_PTR:.*]] = cir.ptr_stride %[[BYTE_PTR]], %[[EIGHT]] : (!cir.ptr<!u8i>, !s32i) -> !cir.ptr<!u8i>
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// LLVM-LABEL: @_Z10allocArrayi
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// LLVM: %[[ALLOC:.*]] = call {{.*}} ptr @_Znam
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// LLVM: store i64 %{{.*}}, ptr %[[ALLOC]], align 8
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// LLVM: %[[DATA:.*]] = getelementptr i8, ptr %[[ALLOC]], i64 8
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// OGCG-LABEL: @_Z10allocArrayi
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// OGCG: %[[ALLOC:.*]] = call {{.*}} ptr @_Znam
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// OGCG: store i64 %{{.*}}, ptr %[[ALLOC]], align 8
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// OGCG: %[[DATA:.*]] = getelementptr inbounds i8, ptr %[[ALLOC]], i64 8
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