[LLVMdev] How to write a regression test case?
Changcheng Wang
changcheng at multicorewareinc.com
Sun Aug 26 22:39:26 PDT 2012
hi,Yang:
if you can give me a examle,which check out a string(such as "abcd")
from a file(such as aaa.c) with fileCheck?
i tried to write it but failed.
thanks for your help!
best wished!
changcheng
On Wed, Aug 22, 2012 at 9:30 PM, Triple Yang <triple.yang at gmail.com> wrote:
> I guess so.
> FileCheck has powerful extensions than just matching some strings so that
> it can support complex situations.
>
> 2012/8/22 Changcheng Wang <changcheng at multicorewareinc.com>:
>> yeah,i see.
>> i thought FileCheck check if the same string in the two file,is it?
>> the file t.s maybe do not have the same string with %s,so FileCheck
>> perhaps give a fail.
>> i am not sure about it.
>>
>> On Wed, Aug 22, 2012 at 3:32 PM, Triple Yang <triple.yang at gmail.com> wrote:
>>> 2012/8/22 Changcheng Wang <changcheng at multicorewareinc.com>:
>>>> the example is more like what i need,it is so nice.
>>>> but,i am indefinite if "RUN: FileCheck < %t.s %s" can pass,i
>>>> understand that t.s was translate from t.ll,%s means read the local
>>>> source,are they the same?
>>>
>>> %t indicates a temporary file for output. ".s" is just a suffix I used
>>> conventionly.
>>> You can replace it with any string you like.
>>>
>>> See entry "tmp" in http://llvm.org/docs/TestingGuide.html#rtvars
>>>
>>>>
>>>> On Wed, Aug 22, 2012 at 1:55 PM, Triple Yang <triple.yang at gmail.com> wrote:
>>>>> I did an experiment just now with a test case like:
>>>>> // RUN: clang %s -S -emit-llvm -o %t.ll
>>>>> // RUN: llc %t.ll -o %t.s
>>>>> // RUN: FileCheck < %t.s %s
>>>>>
>>>>> ...
>>>>>
>>>>> // CHECK: ...
>>>>>
>>>>> And it worked.
>>>>>
>>>>> It seems clang does not take stdin as its input, so "clang < %s" fails.
>>>>> Meanwhile, both "llc < %t.ll" and "llc %t.ll" work.
>>>>>
>>>>> 2012/8/22 Triple Yang <triple.yang at gmail.com>:
>>>>>> 2012/8/21 Triple Yang <triple.yang at gmail.com>:
>>>>>>> 2012/8/21 Changcheng Wang <changcheng at multicorewareinc.com>:
>>>>>>>> Hi,Yang
>>>>>>>> thanks for your entire answer,i will do it follow you.
>>>>>>>> still another question puzzled me:i write a hello.c file like this:
>>>>>>>>
>>>>>>>> //RUN: llc -march=c < %s | FileCheck %s
>>>>>>>> #include"stdio.h"
>>>>>>>>
>>>>>>>> int main() {
>>>>>>>> printf ("Helloworld.\n");
>>>>>>>> return 0;
>>>>>>>> }
>>>>>>>>
>>>>>>>> in fact, i want to thanslate it to a hello.ll file like this:
>>>>>>>> ;RUN: llc -march=c < %s | FileCheck %s
>>>>>>>> .......
>>>>>>>> ;CHECK.....
>>>>>>>>
>>>>>>>> but,when i thanslate the hello.c with clang,the sentence "//RUN: llc
>>>>>>>> -march=c < %s | FileCheck %s" was treated as comment.
>>>>>>>>
>>>>>>>> it samed the method translating hello.c to hello.ll is wrong,isnot it?
>>>>>>>
>>>>>>> To translate a .c file to a .ll file, you should wirte, for example,
>>>>>>> clang -emit-llvm -S test.c -o test.ll
>>>>>>>
>>>>>>> And the corresponding command for regression test might be:
>>>>>>> ; RUN: clang < %s -emit-llvm -S | FileCheck %s
>>>>>>
>>>>>> We can write:
>>>>>> // RUN: clang < %s -emit-llvm -S
>>>>>> in a .c file to test clang.
>>>>>>
>>>>>> And if we use FileCheck, like:
>>>>>> // RUN: clang < %s -emit-llvm -S | FileCheck %s
>>>>>> make sure there is some "// CHECK:" in that file, or lit will report a failure.
>>>>>>
>>>>>> See utils/lit/lit/ExampleTests/Clang for more details.
>>>>>>
>>>>>>>
>>>>>>> Regards.
>>>>>>>
>>>>>>> (PS. When you reply to this email, make sure you send a copy to
>>>>>>> llvmdev at cs.uiuc.edu)
>>>>>>>
>>>>>>>>
>>>>>>>> thanks very much!
>>>>>>>> best wishes
>>>>>>>>
>>>>>>>> changcheng
>>>>>>>>
>>>>>>>> On Tue, Aug 21, 2012 at 10:46 AM, Triple Yang <triple.yang at gmail.com> wrote:
>>>>>>>>> Hi, changcheng,
>>>>>>>>>
>>>>>>>>> There are following steps to be taken to write a test case:
>>>>>>>>> 1. create a directory in test, say "test/XXX"
>>>>>>>>> 2. create a file named lit.local.cfg, which is a configuration file.
>>>>>>>>> The straightforward way is to copy an existed one,
>>>>>>>>> like "test/CodeGen/SPARC/lit.local.cfg". You might need make some
>>>>>>>>> modification on it.
>>>>>>>>> 3. create a file, say "example.ll"
>>>>>>>>> (The name of file does not matter, but the suffix of the file name
>>>>>>>>> DOES matter. See config.suffixes = [ ... ] in lit.local.cfg)
>>>>>>>>> for more details.
>>>>>>>>> example.ll includes normal content of LLVM IR, and the ";RUN ..."
>>>>>>>>> directives at the beginning of the file.
>>>>>>>>> 4. run all regression test cases with "make check", which includes
>>>>>>>>> above test case newly added.
>>>>>>>>> Or you might want to run just that case with "llvm-lit test/XXX"
>>>>>>>>> or "llvm-lit test/XXX/example.ll"
>>>>>>>>> llvm-lit resides in BUILD tree, distinguished from source tree and
>>>>>>>>> install tree. You can find it under
>>>>>>>>> your-build-tree/Release+Asserts/bin/ or
>>>>>>>>> your-build-tree/Debug+Asserts/bin/ or likewise, which depends on your
>>>>>>>>> build
>>>>>>>>> configuration.
>>>>>>>>>
>>>>>>>>> By the way, in the following ";RUN ..." directive
>>>>>>>>> ; RUN: llc < %s -march=x86 | FileCheck %s
>>>>>>>>> %s indicates current file under test. I guess the first %s stands for
>>>>>>>>> the input for llc, while the second and last %s specifies
>>>>>>>>> what to check using "; CHECK ..." directives since you write them down
>>>>>>>>> on exactly CURRENT file.
>>>>>>>>>
>>>>>>>>> Hope it work for you.
>>>>>>>>> Regards.
>>>>>>>>>
>>>>>>>>> 2012/8/20 Changcheng Wang <changcheng at multicorewareinc.com>:
>>>>>>>>>> hi,all:
>>>>>>>>>> i really want to how to write a regression test case,but i do not find
>>>>>>>>>> out a entire document about it.
>>>>>>>>>> By reading LLVM Testing Infrastructure Guide and FileCheck - Flexible
>>>>>>>>>> pattern matching file verifier, i only have a idea,but it is not
>>>>>>>>>> enough for me to write a test case.i need more detail about how to
>>>>>>>>>> write a RUN:lines.
>>>>>>>>>>
>>>>>>>>>> thanks for you scan,wish your letter.
>>>>>>>>>>
>>>>>>>>>> best wishes,
>>>>>>>>>>
>>>>>>>>>> changcheng
>>>>>>>>>> _______________________________________________
>>>>>>>>>> LLVM Developers mailing list
>>>>>>>>>> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
>>>>>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> 杨勇勇 (Yang Yongyong)
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> 杨勇勇 (Yang Yongyong)
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> 杨勇勇 (Yang Yongyong)
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> 杨勇勇 (Yang Yongyong)
>>>
>>>
>>>
>>> --
>>> 杨勇勇 (Yang Yongyong)
>
>
>
> --
> 杨勇勇 (Yang Yongyong)
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