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//===- AnnotateFunctions.cpp ----------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Example clang plugin which adds an annotation to every function in
// translation units that start with #pragma enable_annotate.
//
//===----------------------------------------------------------------------===//
#include "clang/Frontend/FrontendPluginRegistry.h"
#include "clang/AST/AST.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/LexDiagnostic.h"
using namespace clang;
namespace {
static bool EnableAnnotate = false;
static bool HandledDecl = false;
class AnnotateFunctionsConsumer : public ASTConsumer {
public:
bool HandleTopLevelDecl(DeclGroupRef DG) override {
HandledDecl = true;
if (!EnableAnnotate)
return true;
for (auto D : DG)
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
FD->addAttr(AnnotateAttr::CreateImplicit(FD->getASTContext(),
"example_annotation"));
return true;
}
};
class AnnotateFunctionsAction : public PluginASTAction {
public:
std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
llvm::StringRef) override {
return llvm::make_unique<AnnotateFunctionsConsumer>();
}
bool ParseArgs(const CompilerInstance &CI,
const std::vector<std::string> &args) override {
return true;
}
PluginASTAction::ActionType getActionType() override {
return AddBeforeMainAction;
}
};
class PragmaAnnotateHandler : public PragmaHandler {
public:
PragmaAnnotateHandler() : PragmaHandler("enable_annotate") { }
void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &PragmaTok) override {
Token Tok;
PP.LexUnexpandedToken(Tok);
if (Tok.isNot(tok::eod))
PP.Diag(Tok, diag::ext_pp_extra_tokens_at_eol) << "pragma";
if (HandledDecl) {
DiagnosticsEngine &D = PP.getDiagnostics();
unsigned ID = D.getCustomDiagID(
DiagnosticsEngine::Error,
"#pragma enable_annotate not allowed after declarations");
D.Report(PragmaTok.getLocation(), ID);
}
EnableAnnotate = true;
}
};
}
static FrontendPluginRegistry::Add<AnnotateFunctionsAction>
X("annotate-fns", "annotate functions");
static PragmaHandlerRegistry::Add<PragmaAnnotateHandler>
Y("enable_annotate","enable annotation");
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