derek.holloway
7502bf64a4
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27 lines
1.1 KiB
LLVM
27 lines
1.1 KiB
LLVM
; To test that safestack does not break the musttail call contract.
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;
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; RUN: opt < %s --safe-stack -S | FileCheck %s
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; RUN: opt < %s -passes='require<libcall-lowering-info>,safe-stack' -S | FileCheck %s
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target triple = "x86_64-unknown-linux-gnu"
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declare i32 @foo(ptr %p)
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declare void @alloca_test_use(ptr)
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define i32 @call_foo(ptr %a) safestack {
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; CHECK-LABEL: @call_foo(
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; CHECK-NEXT: [[UNSAFE_STACK_PTR:%.*]] = load ptr, ptr @__safestack_unsafe_stack_ptr, align 8
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; CHECK-NEXT: [[UNSAFE_STACK_STATIC_TOP:%.*]] = getelementptr i8, ptr [[UNSAFE_STACK_PTR]], i32 -16
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; CHECK-NEXT: store ptr [[UNSAFE_STACK_STATIC_TOP]], ptr @__safestack_unsafe_stack_ptr, align 8
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; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i8, ptr [[UNSAFE_STACK_PTR]], i32 -10
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; CHECK-NEXT: call void @alloca_test_use(ptr [[TMP1]])
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; CHECK-NEXT: store ptr [[UNSAFE_STACK_PTR]], ptr @__safestack_unsafe_stack_ptr, align 8
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; CHECK-NEXT: [[R:%.*]] = musttail call i32 @foo(ptr [[A:%.*]])
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; CHECK-NEXT: ret i32 [[R]]
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;
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%x = alloca [10 x i8], align 1
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call void @alloca_test_use(ptr %x)
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%r = musttail call i32 @foo(ptr %a)
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ret i32 %r
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}
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