[cfe-dev] Adding custom attributes/metadata to functions and globals

[Félix Cloutier via cfe-dev]

Thanks Eli! That does solve my problem.

Félix

> Le 31 oct. 2016 à 12:31:25, Friedman, Eli <efriedma at codeaurora.org> a écrit :
> 
> On 10/29/2016 11:23 AM, Félix Cloutier via cfe-dev wrote:
>> Hello all,
>> 
>> I'm working on a project that parses C headers with the Clang static libraries for binary program analysis purposes. I consume the AST and do not rely on codegen.
>> 
>> I would love to be able to add some additional metadata to functions: specifically, the expected address of the function in the binary program. For instance:
>> 
>> int foo(int bar) __attribute__((address(0xdeadbeef)));
>> 
>> Attributes are especially convenient because they are easy to embed in a macro, which could end up looking like:
>> 
>> int foo(int bar) ADDRESS(0xdeadbeef);
>> 
>> Since this is an open-source project maintained by me only, I would prefer to not fork Clang, and just allow people to build my program with their distributions' stock Clang packages. Sadly, this apparently means that I can't use attributes for this purpose, because the valid attribute list appears to be hard-coded into Clang, and there doesn't seem to be any attribute that I can co-opt for this purpose.
>> 
>> Are there extension points that I can leverage in the Clang static libraries to allow this?
> 
> The "annotate" attribute (`void f() __attribute((annotate("asdf"))) {}`) takes an arbitrary string, and has no semantic effect.
> 
> -Eli
> 
> -- 
> Employee of Qualcomm Innovation Center, Inc.
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
> 

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