Dumping Clang AST to a file

[Monalisa Rout via cfe-commits]

Hello, Currently I am dumping the Clang AST to the console but I want to
write it to a file.

I have pasted the code snippet.

bool HandleTopLevelDecl(DeclGroupRef DR) override {
for (DeclGroupRef::iterator b = DR.begin(), e = DR.end(); b != e; ++b) {
(*b)->dump(llvm::errs(), false,clang::ADOF_JSON);
}
return true;
}

How this can be done ?? Any help is appreciated.

Regards,
Mona
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