[LLVMdev] How to write a regression test case?

[Changcheng Wang]

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?

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)