8e62db3247
This allows plugins which add AST passes to also define pragmas to do things like only enable certain behaviour of the AST pass in files where a certain pragma is used. Differential Revision: http://reviews.llvm.org/D18319 llvm-svn: 265295
89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
//===- AnnotateFunctions.cpp ----------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Example clang plugin which adds an annotation to every function in
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// translation units that start with #pragma enable_annotate.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Frontend/FrontendPluginRegistry.h"
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#include "clang/AST/AST.h"
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#include "clang/AST/ASTConsumer.h"
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Lex/LexDiagnostic.h"
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using namespace clang;
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namespace {
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static bool EnableAnnotate = false;
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static bool HandledDecl = false;
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class AnnotateFunctionsConsumer : public ASTConsumer {
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public:
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bool HandleTopLevelDecl(DeclGroupRef DG) override {
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HandledDecl = true;
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if (!EnableAnnotate)
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return true;
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for (auto D : DG)
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if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
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FD->addAttr(AnnotateAttr::CreateImplicit(FD->getASTContext(),
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"example_annotation"));
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return true;
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}
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};
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class AnnotateFunctionsAction : public PluginASTAction {
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public:
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std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
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llvm::StringRef) override {
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return llvm::make_unique<AnnotateFunctionsConsumer>();
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}
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bool ParseArgs(const CompilerInstance &CI,
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const std::vector<std::string> &args) override {
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return true;
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}
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PluginASTAction::ActionType getActionType() override {
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return AddBeforeMainAction;
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}
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};
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class PragmaAnnotateHandler : public PragmaHandler {
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public:
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PragmaAnnotateHandler() : PragmaHandler("enable_annotate") { }
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void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
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Token &PragmaTok) override {
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Token Tok;
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PP.LexUnexpandedToken(Tok);
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if (Tok.isNot(tok::eod))
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PP.Diag(Tok, diag::ext_pp_extra_tokens_at_eol) << "pragma";
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if (HandledDecl) {
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DiagnosticsEngine &D = PP.getDiagnostics();
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unsigned ID = D.getCustomDiagID(
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DiagnosticsEngine::Error,
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"#pragma enable_annotate not allowed after declarations");
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D.Report(PragmaTok.getLocation(), ID);
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}
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EnableAnnotate = true;
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}
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};
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}
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static FrontendPluginRegistry::Add<AnnotateFunctionsAction>
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X("annotate-fns", "annotate functions");
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static PragmaHandlerRegistry::Add<PragmaAnnotateHandler>
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Y("enable_annotate","enable annotation");
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