[cfe-dev] SourceManager.getFilename() fails to return the name of header file

[Manuel Klimek via cfe-dev]

I'd recommend using http://clang.llvm.org/docs/LibTooling.html instead of
running on the preprocessed code.

On Tue, Dec 6, 2016 at 12:15 PM Frank Redeker via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hello list,
>
> I am writing a tool to analyze C/C++ code written for a compiler for
> MCUs (e.g. a compiler from IAR Systems, Windriver, Cosmic, Keil)
>
> To create the input file for my analyzer I have to use the compilers
> preprocessor to handle the compiler specific command line options. The
> result of this step is an output file like this.
>
> # 1 "T://source.c"
> # 1 "D:\\Program_Files_32\\Windriver\\diab\\5.9.4.2\\include\\math.h" 1
> # 1 "D:\\Program_Files_32\\Windriver\\diab\\5.9.4.2\\include\\xmacros.h" 1
> # 1
> "D:\\Program_Files_32\\Windriver\\diab\\5.9.4.2\\include\\diab/xmacros.h" 1
> .
> .
> # 4 "D:\\Program_Files_32\\Windriver\\diab\\5.9.4.2\\include\\xmacros.h" 1
> # 4 "D:\\Program_Files_32\\Windriver\\diab\\5.9.4.2\\include\\math.h" 1
> .
> .
> extern long double double cosl_not_supported(void);
>
> inline long double cosl(long double)
>         {
>         return ( long_double_cosl_not_supported() );
>         }
> .
> .
> # 3 "T://source.c"
>
> int foo () {
>         return 1;
> }
>
>
> Inside my AST visitor if have a function like this that gets a
> FunctionDecl:
>
> void handleFunctionDecl (const * FunctionDecl) {
> }
>
> To check if the declaration is inside a system header I use the
> following code which works as expected:
>
> ASTContext &    context(decl->getASTContext());
> FullSourceLoc   location(context.getFullLoc(decl->getLocStart()));
> bool            in_system_header(false);
>
> if (location.isValid()) {
>    in_system_header = location.isInSystemHeader();
> }
>
>
> I also want to know the header file from wich the declaration comes and
> tried the following:
>
> ASTContext &      context(decl->getASTContext());
> SourceManager &   manager(context.getSourceManager());
> SourceLocation    location(decl->getLocStart());
>
> But `manager.getFilename(location)` always returns the name of the main
> file.
>
>
> So I want to ask if I am missing something in setting up the `ClangTool`
> that I am using to produce the ast? Or is there a trick to teach the
> SourceManager to return the name of the header file.
>
>
> Here are the (simplified) steps to create the asts for analysis:
>
> vector<unique_ptr<ASTUnit>>            asts;
> CommonOptionsParser                    options_parser(...);
> ClangTool *                            tool     = new ClangTool(..);
> IntrusiveRefCntPtr<DiagnosticOptions>  options  = new DiagnosticOptions();
> ToolDiagnosticConsumer *               consumer = new
> ToolDiagnosticConsumer(&*options);
>
> tool->setDiagnosticConsumer(consumer);
> int result = tool->buildASTs(asts);
>
>
> Thanks
>
> Frank
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
>
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