[llvm] r310240 - Add -asan-force-dynamic-shadow test

[Hans Wennborg via llvm-commits]

What's the motivation? It seems this just adds a test for
functionality that landed sime time back?

On Mon, Aug 7, 2017 at 8:18 AM, Kuba Mracek <mracek at apple.com> wrote:
> Please merge into release_50.
>
> Thanks,
> Kuba
>
>> On 7 Aug 2017, at 00:12, Vitaly Buka via llvm-commits <llvm-commits at lists.llvm.org> wrote:
>>
>> Author: vitalybuka
>> Date: Mon Aug  7 00:12:33 2017
>> New Revision: 310240
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=310240&view=rev
>> Log:
>> Add -asan-force-dynamic-shadow test
>>
>> Added:
>>    llvm/trunk/test/Instrumentation/AddressSanitizer/force-dynamic-shadow.ll
>>
>> Added: llvm/trunk/test/Instrumentation/AddressSanitizer/force-dynamic-shadow.ll
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Instrumentation/AddressSanitizer/force-dynamic-shadow.ll?rev=310240&view=auto
>> ==============================================================================
>> --- llvm/trunk/test/Instrumentation/AddressSanitizer/force-dynamic-shadow.ll (added)
>> +++ llvm/trunk/test/Instrumentation/AddressSanitizer/force-dynamic-shadow.ll Mon Aug  7 00:12:33 2017
>> @@ -0,0 +1,22 @@
>> +; Test -asan-force-dynamic-shadow flag.
>> +;
>> +; RUN: opt -asan -asan-module -S -asan-force-dynamic-shadow=1 < %s | FileCheck %s --check-prefixes=CHECK,CHECK-FDS
>> +; RUN: opt -asan -asan-module -S -asan-force-dynamic-shadow=0 < %s | FileCheck %s --check-prefixes=CHECK,CHECK-NDS
>> +
>> +target triple = "x86_64-unknown-linux-gnu"
>> +
>> +define i32 @test_load(i32* %a) sanitize_address {
>> +; First instrumentation in the function must be to load the dynamic shadow
>> +; address into a local variable.
>> +; CHECK-LABEL: @test_load
>> +; CHECK: entry:
>> +; CHECK-FDS-NEXT: %[[SHADOW:[^ ]*]] = load i64, i64* @__asan_shadow_memory_dynamic_address
>> +; CHECK-NDS-NOT: __asan_shadow_memory_dynamic_address
>> +
>> +; Shadow address is loaded and added into the whole offset computation.
>> +; CHECK-FDS add i64 %{{.*}}, %[[SHADOW] ]
>> +
>> +entry:
>> +  %tmp1 = load i32, i32* %a, align 4
>> +  ret i32 %tmp1
>> +}
>>
>>
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>