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author | John Brawn <john.brawn@arm.com> | 2016-04-04 14:22:58 +0000 |
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committer | John Brawn <john.brawn@arm.com> | 2016-04-04 14:22:58 +0000 |
commit | 750988f638cde2f5dbfa1d6afd4ff4844304caf7 (patch) | |
tree | bc8cb0027004b1f8ed9e3a8a8787fa42ae46cde7 /examples | |
parent | dffb97b7784248a8e340791697392b17fe74de5b (diff) | |
download | clang-750988f638cde2f5dbfa1d6afd4ff4844304caf7.tar.gz |
Add a PragmaHandler Registry for plugins to add PragmaHandlers to
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
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@265295 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'examples')
-rw-r--r-- | examples/AnnotateFunctions/AnnotateFunctions.cpp | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/examples/AnnotateFunctions/AnnotateFunctions.cpp b/examples/AnnotateFunctions/AnnotateFunctions.cpp index f2e7322183..375f18f8e0 100644 --- a/examples/AnnotateFunctions/AnnotateFunctions.cpp +++ b/examples/AnnotateFunctions/AnnotateFunctions.cpp @@ -7,20 +7,29 @@ // //===----------------------------------------------------------------------===// // -// Example clang plugin which adds an annotation to every function. +// 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(), @@ -46,7 +55,34 @@ public: } }; +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"); |