[cfe-dev] SourceRange for a macro-expanded function definition?

[Michael Bolin]

Here is a better example:

https://gist.github.com/bolinfest/9984257

Here are the key lines in the output:

|-FunctionDecl 0x10450ca90 <./example.h:15:1,
/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:137:72>
someFunction1 'NSString *(void)' extern
|-FunctionDecl 0x10450cc00 <./example.h:16:1,
/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:137:72>
someFunction2 'NSString *(void)' extern

Ideally, I would like to be able to get the following instead:

|-FunctionDecl 0x10450ca90 <./example.h:15:1, ./example.h:15:61>
someFunction1 'NSString *(void)' extern
|-FunctionDecl 0x10450cc00 <./example.h:16:1, ./example.h:16:61>
someFunction2 'NSString *(void)' extern

That is, I would like to be able to extract a SourceRange from a single
file that I could delete (or comment out) to remove the definition or
someFunction1 or someFunction2. Obviously the existing SourceRange that I
get from the AST makes that hard to do.

Is it possible to get my desired SourceRange?

Thank you,
Michael



On Wed, Apr 2, 2014 at 1:51 AM, Manuel Klimek <klimek at google.com> wrote:

> On Wed, Apr 2, 2014 at 2:31 AM, Michael Bolin <bolinfest at gmail.com> wrote:
>
>> Hi, I am traversing the AST for an obj-c file using a clang plugin. I
>> have a code snippet like the following:
>>
>> #define JK_ATTRIBUTES(attr, ...)        __attribute__((attr,
>> ##__VA_ARGS__))
>> #define JK_STATIC_INLINE static __inline__ JK_ATTRIBUTES(always_inline)
>>
>> JK_STATIC_INLINE int jk_parse_skip_newline();
>>
>> @implementation Hello
>> - (void)say:(int)i {
>>   if (i > 0) {
>>     NSLog(@"Hello, world! (%d)", i);
>>   }
>>
>>   // Example of selector with unknown method declaration.
>>   [(id)@"Anything" length];
>> }
>> @end
>>
>> JK_STATIC_INLINE int jk_parse_skip_newline() {
>>   return 0;
>> }
>>
>> so while traversing the AST, I am trying to find the SourceRange of the
>> jk_parse_skip_newline() definition at the bottom of the file. For non-macro
>> expanded functions, this is very straightforward. But due to the macro
>> expansion, I get a SourceRange that spans from the start of the macro to
>> the end of my code snippet.
>>
>
> How do you get that? If you only use functions that handle SourceRanges
> (and never combine locations you get from getBegin() getEnd()) that should
> not be possible.
> Take a look at Lexer::makeFileCharRange and Lexer::getSourceText for how
> to deal with macro-ized ranges.
>
>
>> That means that it also includes the Hello class, which has nothing to do
>> with jk_parse_skip_newline(). This is a problem because I am trying to use
>> the AST to determine where jk_parse_skip_newline is defined so I can
>> comment it out of the source file.
>>
>> Is it possible for me to get the necessary SourceRange from the clang
>> API? Ideally, I would get a SourceRange that identifies only the last three
>> lines of my code sample.
>>
>> Thank you,
>> Michael
>>
>> _______________________________________________
>> cfe-dev mailing list
>> cfe-dev at cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>>
>>
>
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