[cfe-dev] Understanding Source Locations

[Stephen Kelly via cfe-dev]

On 15/02/2019 23:07, Alex Denisov via cfe-dev wrote:
> Hi there,
> 
> I'm having an issue using SourceLocations.
> I do the following:
> 
> 1. Create ASTUnit from code:
> 
> auto buffer = MemoryBuffer::getFile(path);
> Twine code(buffer.get()->getBuffer());
> auto ast = std::move(clang::tooling::buildASTFromCodeWithArgs(code,
>      { "-x", "c++", "-I", "<the right path to a header>"}, path));
> 
> 2. Create simple custom RecursiveASTVisitor and run it against the ASTUnit:
> 
> Visitor visitor(ast->getSourceManager());
> visitor.TraverseDecl(ast->getASTContext().getTranslationUnitDecl());
> 
> 3. In the visitor, dump locations of some BinaryOperators:
> 
> bool VisitBinaryOperator(clang::BinaryOperator *binaryOperator) {
>    auto range = binaryOperator->getSourceRange();
>    range.getBegin().dump(sourceManager);
> }
> 
> It all works good, until some point:
> 
> include/header.h:8:9
> main.cpp:5:7
> main.cpp:9:7
> main.cpp:13:7
> main.cpp:17:7
> <marker>
> main.cpp:18:126
> main.cpp:22:19
> main.cpp:32:7


Hi Alex,

I couldn't repro this with clang-query at least. Perhaps if you provide 
an sscce.org, it will reveal the problem.

Thanks,

Stephen.