[LLVMdev] How to write a regression test case?
Changcheng Wang
changcheng at multicorewareinc.com
Tue Aug 28 23:41:44 PDT 2012
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)
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