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//===--- PPCallbacks.h - Callbacks for Preprocessor actions -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the PPCallbacks interface.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LEX_PPCALLBACKS_H
#define LLVM_CLANG_LEX_PPCALLBACKS_H
#include "clang/Lex/DirectoryLookup.h"
#include "clang/Basic/SourceLocation.h"
#include <string>
namespace clang {
class SourceLocation;
class Token;
class IdentifierInfo;
class MacroInfo;
/// PPCallbacks - This interface provides a way to observe the actions of the
/// preprocessor as it does its thing. Clients can define their hooks here to
/// implement preprocessor level tools.
class PPCallbacks {
public:
virtual ~PPCallbacks();
enum FileChangeReason {
EnterFile, ExitFile, SystemHeaderPragma, RenameFile
};
/// FileChanged - This callback is invoked whenever a source file is
/// entered or exited. The SourceLocation indicates the new location, and
/// EnteringFile indicates whether this is because we are entering a new
/// #include'd file (when true) or whether we're exiting one because we ran
/// off the end (when false).
virtual void FileChanged(SourceLocation Loc, FileChangeReason Reason,
SrcMgr::CharacteristicKind FileType) {
}
/// Ident - This callback is invoked when a #ident or #sccs directive is read.
///
virtual void Ident(SourceLocation Loc, const std::string &str) {
}
/// PragmaComment - This callback is invoked when a #pragma comment directive
/// is read.
///
virtual void PragmaComment(SourceLocation Loc, const IdentifierInfo *Kind,
const std::string &Str) {
}
/// MacroExpands - This is called by
/// Preprocessor::HandleMacroExpandedIdentifier when a macro invocation is
/// found.
virtual void MacroExpands(const Token &Id, const MacroInfo* MI) {
}
/// MacroDefined - This hook is called whenever a macro definition is seen.
virtual void MacroDefined(const IdentifierInfo *II, const MacroInfo *MI) {
}
/// MacroUndefined - This hook is called whenever a macro #undef is seen.
/// MI is released immediately following this callback.
virtual void MacroUndefined(const IdentifierInfo *II, const MacroInfo *MI) {
}
};
/// PPChainedCallbacks - Simple wrapper class for chaining callbacks.
class PPChainedCallbacks : public PPCallbacks {
PPCallbacks *First, *Second;
public:
PPChainedCallbacks(PPCallbacks *_First, PPCallbacks *_Second)
: First(_First), Second(_Second) {}
~PPChainedCallbacks() {
delete Second;
delete First;
}
virtual void FileChanged(SourceLocation Loc, FileChangeReason Reason,
SrcMgr::CharacteristicKind FileType) {
First->FileChanged(Loc, Reason, FileType);
Second->FileChanged(Loc, Reason, FileType);
}
virtual void Ident(SourceLocation Loc, const std::string &str) {
First->Ident(Loc, str);
Second->Ident(Loc, str);
}
virtual void PragmaComment(SourceLocation Loc, const IdentifierInfo *Kind,
const std::string &Str) {
First->PragmaComment(Loc, Kind, Str);
Second->PragmaComment(Loc, Kind, Str);
}
virtual void MacroExpands(const Token &Id, const MacroInfo* MI) {
First->MacroExpands(Id, MI);
Second->MacroExpands(Id, MI);
}
virtual void MacroDefined(const IdentifierInfo *II, const MacroInfo *MI) {
First->MacroDefined(II, MI);
Second->MacroDefined(II, MI);
}
virtual void MacroUndefined(const IdentifierInfo *II, const MacroInfo *MI) {
First->MacroUndefined(II, MI);
Second->MacroUndefined(II, MI);
}
};
} // end namespace clang
#endif
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