30709b038d
came from a macro expansion, this allows us to keep track of both where the character data came from and where the logical position of the token is (at the expansion site). This implements Preprocessor/indent_macro.c, and reduces the number of cpp iostream -E diffs vs GCC from 2589 to 2297. llvm-svn: 38557
64 lines
2.4 KiB
C++
64 lines
2.4 KiB
C++
//===--- MacroExpander.cpp - Lex from a macro expansion -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the MacroExpander interface.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Lex/MacroExpander.h"
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#include "clang/Lex/MacroInfo.h"
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Basic/SourceManager.h"
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using namespace llvm;
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using namespace clang;
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MacroExpander::MacroExpander(LexerToken &Tok, Preprocessor &pp)
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: Macro(*Tok.getIdentifierInfo()->getMacroInfo()), PP(pp), CurToken(0),
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InstantiateLoc(Tok.getLocation()),
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AtStartOfLine(Tok.isAtStartOfLine()),
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HasLeadingSpace(Tok.hasLeadingSpace()) {
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}
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/// Lex - Lex and return a token from this macro stream.
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///
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void MacroExpander::Lex(LexerToken &Tok) {
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// Lexing off the end of the macro, pop this macro off the expansion stack.
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if (CurToken == Macro.getNumTokens())
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return PP.HandleEndOfMacro(Tok);
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// Get the next token to return.
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Tok = Macro.getReplacementToken(CurToken++);
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//Tok.SetLocation(InstantiateLoc);
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// The token's current location indicate where the token was lexed from. We
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// need this information to compute the spelling of the token, but any
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// diagnostics for the expanded token should appear as if they came from
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// InstantiateLoc. Pull this information together into a new SourceLocation
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// that captures all of this.
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unsigned CharFilePos = Tok.getLocation().getRawFilePos();
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unsigned CharFileID = Tok.getLocation().getFileID();
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unsigned InstantiationFileID =
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PP.getSourceManager().createFileIDForMacroExp(InstantiateLoc, CharFileID);
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Tok.SetLocation(SourceLocation(InstantiationFileID, CharFilePos));
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// If this is the first token, set the lexical properties of the token to
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// match the lexical properties of the macro identifier.
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if (CurToken == 1) {
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Tok.SetFlagValue(LexerToken::StartOfLine , AtStartOfLine);
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Tok.SetFlagValue(LexerToken::LeadingSpace, HasLeadingSpace);
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}
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// Handle recursive expansion!
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if (Tok.getIdentifierInfo())
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return PP.HandleIdentifier(Tok);
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// Otherwise, return a normal token.
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}
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