forked from OSchip/llvm-project
60 lines
2.2 KiB
C++
60 lines
2.2 KiB
C++
//===--- MacroExpander.cpp - Lex from a macro expansion -------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by Chris Lattner and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the MacroExpander interface.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "clang/Lex/MacroExpander.h"
|
|
#include "clang/Lex/MacroInfo.h"
|
|
#include "clang/Lex/Preprocessor.h"
|
|
#include "clang/Basic/SourceManager.h"
|
|
using namespace llvm;
|
|
using namespace clang;
|
|
|
|
MacroExpander::MacroExpander(LexerToken &Tok, Preprocessor &pp)
|
|
: Macro(*Tok.getIdentifierInfo()->getMacroInfo()), PP(pp), CurToken(0),
|
|
InstantiateLoc(Tok.getLocation()),
|
|
AtStartOfLine(Tok.isAtStartOfLine()),
|
|
HasLeadingSpace(Tok.hasLeadingSpace()) {
|
|
}
|
|
|
|
|
|
/// Lex - Lex and return a token from this macro stream.
|
|
///
|
|
void MacroExpander::Lex(LexerToken &Tok) {
|
|
// Lexing off the end of the macro, pop this macro off the expansion stack.
|
|
if (CurToken == Macro.getNumTokens())
|
|
return PP.HandleEndOfMacro(Tok);
|
|
|
|
// Get the next token to return.
|
|
Tok = Macro.getReplacementToken(CurToken++);
|
|
|
|
// The token's current location indicate where the token was lexed from. We
|
|
// need this information to compute the spelling of the token, but any
|
|
// diagnostics for the expanded token should appear as if they came from
|
|
// InstantiationLoc. Pull this information together into a new SourceLocation
|
|
// that captures all of this.
|
|
Tok.SetLocation(PP.getSourceManager().getInstantiationLoc(Tok.getLocation(),
|
|
InstantiateLoc));
|
|
|
|
// If this is the first token, set the lexical properties of the token to
|
|
// match the lexical properties of the macro identifier.
|
|
if (CurToken == 1) {
|
|
Tok.SetFlagValue(LexerToken::StartOfLine , AtStartOfLine);
|
|
Tok.SetFlagValue(LexerToken::LeadingSpace, HasLeadingSpace);
|
|
}
|
|
|
|
// Handle recursive expansion!
|
|
if (Tok.getIdentifierInfo())
|
|
return PP.HandleIdentifier(Tok);
|
|
|
|
// Otherwise, return a normal token.
|
|
}
|