25 lines
793 B
C++
25 lines
793 B
C++
// RUN: %clang_cc1 -x c++ -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
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// RUN: %clang_cc1 -x c++ -fsanitize=pointer-overflow -fno-sanitize-recover=pointer-overflow -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
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#include <stdint.h>
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struct S {
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int x, y;
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};
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// CHECK-LABEL: define i64 @{{.*}}get_offset_of_y_naively{{.*}}(
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uintptr_t get_offset_of_y_naively() {
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// CHECK: [[ENTRY:.*]]:
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// CHECK-NEXT: ret i64 ptrtoint (i32* getelementptr (i32, i32* null, i32 1) to i64)
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// CHECK-NEXT: }
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return ((uintptr_t)(&(((S *)nullptr)->y)));
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}
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// CHECK-LABEL: define i64 @{{.*}}get_offset_of_y_via_builtin{{.*}}(
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uintptr_t get_offset_of_y_via_builtin() {
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// CHECK: [[ENTRY:.*]]:
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// CHECK-NEXT: ret i64 4
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// CHECK-NEXT: }
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return __builtin_offsetof(S, y);
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}
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