[LLVMdev] How to write a regression test case?

Tue Aug 28 23:56:49 PDT 2012

hi,yang:
i had delete the temporary files,sorry to trouble you.
it is so easy: // RUN: rm ....

Regards
changcheng

On Wed, Aug 29, 2012 at 2:41 PM, Changcheng Wang
<changcheng at multicorewareinc.com> wrote:
> hi,yang:
> how can i remove the temporary files?
> if i can remove them,all is ok!
>
> yours:
>
> changcheng
>
> On Wed, Aug 29, 2012 at 2:14 PM, Changcheng Wang
> <changcheng at multicorewareinc.com> wrote:
>> hi,yang:
>> sorry to trouble you another time,i used your example and it run
>> well,but a problem came,it create severel temporary files i chaged the
>> RUN: line but failed.
>> i changed it like this,can you give me some suggestions?
>>
>> // RUN: clang %s -S -emit-llvm | llc -march=c | clang -S -emit-llvm |
>> lli | FileCheck %s
>>
>> thanks,
>> best wishes,
>>
>> changcheng
>>
>>
>> On Wed, Aug 29, 2012 at 8:39 AM, Changcheng Wang
>> <changcheng at multicorewareinc.com> wrote:
>>> hi,yang:
>>> i had realized the test.
>>> thanks for your help!
>>>
>>> yours,
>>> changcheng
>>>
>>> On Tue, Aug 28, 2012 at 8:58 PM, Triple Yang <triple.yang at gmail.com> wrote:
>>>> That example is a standalone one which means you can run it without
>>>> extra modification.
>>>> Feel free to try it.
>>>>
>>>> 2012/8/28 Changcheng Wang <changcheng at multicorewareinc.com>:
>>>>> hi,yang:
>>>>> sorry to trouble you,i have a little question about the example you give me.
>>>>> the example is a C file,can i run it without translate into a ll file?
>>>>> the command line maybe like this: llvm-lit ./example.c
>>>>>
>>>>
>>>> Yes, you can. There is no need for extra translation.
>>>>
>>>>> as i want to write a test to check cBackend,i want the test :
>>>>> 1.translate a example.c file to example.ll file with clang.
>>>>> 2.translate the example.ll file to transExample.c file with cBackend.
>>>>> 3.compile the transExample.c file to transExample.bc with clang.
>>>>> 4.run the transExample.bc and check the output.
>>>>>
>>>>> can i write the RUN: line into example.c file just like you did?
>>>>
>>>> I guess so. Just pay attention to file IO and stdio. If you are not
>>>> sure about something, redirect IO flows to temporary files.
>>>>
>>>> Anyway, feel free to try.
>>>>
>>>>>
>>>>> thanks,
>>>>> your,
>>>>> changcheng
>>>>>
>>>>>
>>>>> On Tue, Aug 28, 2012 at 11:40 AM, Triple Yang <triple.yang at gmail.com> wrote:
>>>>>> Wang,
>>>>>> Attachment is a simple example, you may put it in test/CodeGen, and run with
>>>>>> llvm-lit C90
>>>>>>
>>>>>> It worked ok in my llvm 3.2 devel. Let know if you come into any trouble.
>>>>>>
>>>>>> Regards.
>>>>>>
>>>>>> 2012/8/27 Changcheng Wang <changcheng at multicorewareinc.com>:
>>>>>>> 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)
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> 杨勇勇 (Yang Yongyong)
>>>>
>>>>
>>>>
>>>> --
>>>> 杨勇勇 (Yang Yongyong)