[LLVMdev] How to write a regression test case?

[Triple Yang]

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

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)