clang-1/lib/Frontend/PrintPreprocessedOutput.cpp

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//===--- PrintPreprocessedOutput.cpp - Implement the -E mode --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This code simply runs the preprocessor on the input file and prints out the
// result. This is the traditional behavior of the -E option.
//
//===----------------------------------------------------------------------===//
#include "clang/Frontend/Utils.h"
#include "clang/Lex/MacroInfo.h"
#include "clang/Lex/PPCallbacks.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/Pragma.h"
#include "clang/Lex/TokenConcatenation.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/Diagnostic.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Config/config.h"
#include "llvm/Support/raw_ostream.h"
#include <cstdio>
using namespace clang;
/// PrintMacroDefinition - Print a macro definition in a form that will be
/// properly accepted back as a definition.
static void PrintMacroDefinition(const IdentifierInfo &II, const MacroInfo &MI,
Preprocessor &PP, llvm::raw_ostream &OS) {
OS << "#define " << II.getName();
if (MI.isFunctionLike()) {
OS << '(';
if (MI.arg_empty())
;
else if (MI.getNumArgs() == 1)
OS << (*MI.arg_begin())->getName();
else {
MacroInfo::arg_iterator AI = MI.arg_begin(), E = MI.arg_end();
OS << (*AI++)->getName();
while (AI != E)
OS << ',' << (*AI++)->getName();
}
if (MI.isVariadic()) {
if (!MI.arg_empty())
OS << ',';
OS << "...";
}
OS << ')';
}
// GCC always emits a space, even if the macro body is empty. However, do not
// want to emit two spaces if the first token has a leading space.
if (MI.tokens_empty() || !MI.tokens_begin()->hasLeadingSpace())
OS << ' ';
llvm::SmallVector<char, 128> SpellingBuffer;
for (MacroInfo::tokens_iterator I = MI.tokens_begin(), E = MI.tokens_end();
I != E; ++I) {
if (I->hasLeadingSpace())
OS << ' ';
// Make sure we have enough space in the spelling buffer.
if (I->getLength() < SpellingBuffer.size())
SpellingBuffer.resize(I->getLength());
const char *Buffer = SpellingBuffer.data();
unsigned SpellingLen = PP.getSpelling(*I, Buffer);
OS.write(Buffer, SpellingLen);
}
}
//===----------------------------------------------------------------------===//
// Preprocessed token printer
//===----------------------------------------------------------------------===//
namespace {
class PrintPPOutputPPCallbacks : public PPCallbacks {
Preprocessor &PP;
TokenConcatenation ConcatInfo;
public:
llvm::raw_ostream &OS;
private:
unsigned CurLine;
bool EmittedTokensOnThisLine;
SrcMgr::CharacteristicKind FileType;
llvm::SmallString<512> CurFilename;
bool Initialized;
bool DisableLineMarkers;
bool DumpDefines;
public:
PrintPPOutputPPCallbacks(Preprocessor &pp, llvm::raw_ostream &os,
bool lineMarkers, bool defines)
: PP(pp), ConcatInfo(PP), OS(os), DisableLineMarkers(lineMarkers),
DumpDefines(defines) {
CurLine = 0;
CurFilename += "<uninit>";
EmittedTokensOnThisLine = false;
FileType = SrcMgr::C_User;
Initialized = false;
}
void SetEmittedTokensOnThisLine() { EmittedTokensOnThisLine = true; }
bool hasEmittedTokensOnThisLine() const { return EmittedTokensOnThisLine; }
virtual void FileChanged(SourceLocation Loc, FileChangeReason Reason,
SrcMgr::CharacteristicKind FileType);
virtual void Ident(SourceLocation Loc, const std::string &str);
virtual void PragmaComment(SourceLocation Loc, const IdentifierInfo *Kind,
const std::string &Str);
bool HandleFirstTokOnLine(Token &Tok);
bool MoveToLine(SourceLocation Loc);
bool AvoidConcat(const Token &PrevTok, const Token &Tok) {
return ConcatInfo.AvoidConcat(PrevTok, Tok);
}
void WriteLineInfo(unsigned LineNo, const char *Extra=0, unsigned ExtraLen=0);
/// MacroDefined - This hook is called whenever a macro definition is seen.
void MacroDefined(const IdentifierInfo *II, const MacroInfo *MI);
};
} // end anonymous namespace
void PrintPPOutputPPCallbacks::WriteLineInfo(unsigned LineNo,
const char *Extra,
unsigned ExtraLen) {
if (EmittedTokensOnThisLine) {
OS << '\n';
EmittedTokensOnThisLine = false;
}
OS << '#' << ' ' << LineNo << ' ' << '"';
OS.write(&CurFilename[0], CurFilename.size());
OS << '"';
if (ExtraLen)
OS.write(Extra, ExtraLen);
if (FileType == SrcMgr::C_System)
OS.write(" 3", 2);
else if (FileType == SrcMgr::C_ExternCSystem)
OS.write(" 3 4", 4);
OS << '\n';
}
/// MoveToLine - Move the output to the source line specified by the location
/// object. We can do this by emitting some number of \n's, or be emitting a
/// #line directive. This returns false if already at the specified line, true
/// if some newlines were emitted.
bool PrintPPOutputPPCallbacks::MoveToLine(SourceLocation Loc) {
unsigned LineNo = PP.getSourceManager().getInstantiationLineNumber(Loc);
if (DisableLineMarkers) {
if (LineNo == CurLine) return false;
CurLine = LineNo;
if (!EmittedTokensOnThisLine)
return true;
OS << '\n';
EmittedTokensOnThisLine = false;
return true;
}
// If this line is "close enough" to the original line, just print newlines,
// otherwise print a #line directive.
if (LineNo-CurLine <= 8) {
if (LineNo-CurLine == 1)
OS << '\n';
else if (LineNo == CurLine)
return false; // Spelling line moved, but instantiation line didn't.
else {
const char *NewLines = "\n\n\n\n\n\n\n\n";
OS.write(NewLines, LineNo-CurLine);
}
} else {
WriteLineInfo(LineNo, 0, 0);
}
CurLine = LineNo;
return true;
}
/// FileChanged - Whenever the preprocessor enters or exits a #include file
/// it invokes this handler. Update our conception of the current source
/// position.
void PrintPPOutputPPCallbacks::FileChanged(SourceLocation Loc,
FileChangeReason Reason,
SrcMgr::CharacteristicKind NewFileType) {
// Unless we are exiting a #include, make sure to skip ahead to the line the
// #include directive was at.
SourceManager &SourceMgr = PP.getSourceManager();
if (Reason == PPCallbacks::EnterFile) {
SourceLocation IncludeLoc = SourceMgr.getPresumedLoc(Loc).getIncludeLoc();
if (IncludeLoc.isValid())
MoveToLine(IncludeLoc);
} else if (Reason == PPCallbacks::SystemHeaderPragma) {
MoveToLine(Loc);
// TODO GCC emits the # directive for this directive on the line AFTER the
// directive and emits a bunch of spaces that aren't needed. Emulate this
// strange behavior.
}
Loc = SourceMgr.getInstantiationLoc(Loc);
// FIXME: Should use presumed line #!
CurLine = SourceMgr.getInstantiationLineNumber(Loc);
if (DisableLineMarkers) return;
CurFilename.clear();
CurFilename += SourceMgr.getPresumedLoc(Loc).getFilename();
Lexer::Stringify(CurFilename);
FileType = NewFileType;
if (!Initialized) {
WriteLineInfo(CurLine);
Initialized = true;
}
switch (Reason) {
case PPCallbacks::EnterFile:
WriteLineInfo(CurLine, " 1", 2);
break;
case PPCallbacks::ExitFile:
WriteLineInfo(CurLine, " 2", 2);
break;
case PPCallbacks::SystemHeaderPragma:
case PPCallbacks::RenameFile:
WriteLineInfo(CurLine);
break;
}
}
/// Ident - Handle #ident directives when read by the preprocessor.
///
void PrintPPOutputPPCallbacks::Ident(SourceLocation Loc, const std::string &S) {
MoveToLine(Loc);
OS.write("#ident ", strlen("#ident "));
OS.write(&S[0], S.size());
EmittedTokensOnThisLine = true;
}
/// MacroDefined - This hook is called whenever a macro definition is seen.
void PrintPPOutputPPCallbacks::MacroDefined(const IdentifierInfo *II,
const MacroInfo *MI) {
// Only print out macro definitions in -dD mode.
if (!DumpDefines ||
// Ignore __FILE__ etc.
MI->isBuiltinMacro()) return;
MoveToLine(MI->getDefinitionLoc());
PrintMacroDefinition(*II, *MI, PP, OS);
}
void PrintPPOutputPPCallbacks::PragmaComment(SourceLocation Loc,
const IdentifierInfo *Kind,
const std::string &Str) {
MoveToLine(Loc);
OS << "#pragma comment(" << Kind->getName();
if (!Str.empty()) {
OS << ", \"";
for (unsigned i = 0, e = Str.size(); i != e; ++i) {
unsigned char Char = Str[i];
if (isprint(Char) && Char != '\\' && Char != '"')
OS << (char)Char;
else // Output anything hard as an octal escape.
OS << '\\'
<< (char)('0'+ ((Char >> 6) & 7))
<< (char)('0'+ ((Char >> 3) & 7))
<< (char)('0'+ ((Char >> 0) & 7));
}
OS << '"';
}
OS << ')';
EmittedTokensOnThisLine = true;
}
/// HandleFirstTokOnLine - When emitting a preprocessed file in -E mode, this
/// is called for the first token on each new line. If this really is the start
/// of a new logical line, handle it and return true, otherwise return false.
/// This may not be the start of a logical line because the "start of line"
/// marker is set for spelling lines, not instantiation ones.
bool PrintPPOutputPPCallbacks::HandleFirstTokOnLine(Token &Tok) {
// Figure out what line we went to and insert the appropriate number of
// newline characters.
if (!MoveToLine(Tok.getLocation()))
return false;
// Print out space characters so that the first token on a line is
// indented for easy reading.
const SourceManager &SourceMgr = PP.getSourceManager();
unsigned ColNo = SourceMgr.getInstantiationColumnNumber(Tok.getLocation());
// This hack prevents stuff like:
// #define HASH #
// HASH define foo bar
// From having the # character end up at column 1, which makes it so it
// is not handled as a #define next time through the preprocessor if in
// -fpreprocessed mode.
if (ColNo <= 1 && Tok.is(tok::hash))
OS << ' ';
// Otherwise, indent the appropriate number of spaces.
for (; ColNo > 1; --ColNo)
OS << ' ';
return true;
}
namespace {
struct UnknownPragmaHandler : public PragmaHandler {
const char *Prefix;
PrintPPOutputPPCallbacks *Callbacks;
UnknownPragmaHandler(const char *prefix, PrintPPOutputPPCallbacks *callbacks)
: PragmaHandler(0), Prefix(prefix), Callbacks(callbacks) {}
virtual void HandlePragma(Preprocessor &PP, Token &PragmaTok) {
// Figure out what line we went to and insert the appropriate number of
// newline characters.
Callbacks->MoveToLine(PragmaTok.getLocation());
Callbacks->OS.write(Prefix, strlen(Prefix));
// Read and print all of the pragma tokens.
while (PragmaTok.isNot(tok::eom)) {
if (PragmaTok.hasLeadingSpace())
Callbacks->OS << ' ';
std::string TokSpell = PP.getSpelling(PragmaTok);
Callbacks->OS.write(&TokSpell[0], TokSpell.size());
PP.LexUnexpandedToken(PragmaTok);
}
Callbacks->OS << '\n';
}
};
} // end anonymous namespace
static void PrintPreprocessedTokens(Preprocessor &PP, Token &Tok,
PrintPPOutputPPCallbacks *Callbacks,
llvm::raw_ostream &OS) {
char Buffer[256];
Token PrevTok;
while (1) {
// If this token is at the start of a line, emit newlines if needed.
if (Tok.isAtStartOfLine() && Callbacks->HandleFirstTokOnLine(Tok)) {
// done.
} else if (Tok.hasLeadingSpace() ||
// If we haven't emitted a token on this line yet, PrevTok isn't
// useful to look at and no concatenation could happen anyway.
(Callbacks->hasEmittedTokensOnThisLine() &&
// Don't print "-" next to "-", it would form "--".
Callbacks->AvoidConcat(PrevTok, Tok))) {
OS << ' ';
}
if (IdentifierInfo *II = Tok.getIdentifierInfo()) {
OS.write(II->getName(), II->getLength());
} else if (Tok.isLiteral() && !Tok.needsCleaning() &&
Tok.getLiteralData()) {
OS.write(Tok.getLiteralData(), Tok.getLength());
} else if (Tok.getLength() < 256) {
const char *TokPtr = Buffer;
unsigned Len = PP.getSpelling(Tok, TokPtr);
OS.write(TokPtr, Len);
} else {
std::string S = PP.getSpelling(Tok);
OS.write(&S[0], S.size());
}
Callbacks->SetEmittedTokensOnThisLine();
if (Tok.is(tok::eof)) break;
PrevTok = Tok;
PP.Lex(Tok);
}
}
namespace {
struct SortMacrosByID {
typedef std::pair<IdentifierInfo*, MacroInfo*> id_macro_pair;
bool operator()(const id_macro_pair &LHS, const id_macro_pair &RHS) const {
return strcmp(LHS.first->getName(), RHS.first->getName()) < 0;
}
};
}
void clang::DoPrintMacros(Preprocessor &PP, llvm::raw_ostream *OS) {
// -dM mode just scans and ignores all tokens in the files, then dumps out
// the macro table at the end.
PP.EnterMainSourceFile();
Token Tok;
do PP.Lex(Tok);
while (Tok.isNot(tok::eof));
std::vector<std::pair<IdentifierInfo*, MacroInfo*> > MacrosByID;
for (Preprocessor::macro_iterator I = PP.macro_begin(), E = PP.macro_end();
I != E; ++I)
MacrosByID.push_back(*I);
std::sort(MacrosByID.begin(), MacrosByID.end(), SortMacrosByID());
for (unsigned i = 0, e = MacrosByID.size(); i != e; ++i) {
MacroInfo &MI = *MacrosByID[i].second;
// Ignore computed macros like __LINE__ and friends.
if (MI.isBuiltinMacro()) continue;
PrintMacroDefinition(*MacrosByID[i].first, MI, PP, *OS);
*OS << "\n";
}
}
/// DoPrintPreprocessedInput - This implements -E mode.
///
void clang::DoPrintPreprocessedInput(Preprocessor &PP, llvm::raw_ostream *OS,
bool EnableCommentOutput,
bool EnableMacroCommentOutput,
bool DisableLineMarkers,
bool DumpDefines) {
// Inform the preprocessor whether we want it to retain comments or not, due
// to -C or -CC.
PP.SetCommentRetentionState(EnableCommentOutput, EnableMacroCommentOutput);
OS->SetBufferSize(64*1024);
PrintPPOutputPPCallbacks *Callbacks =
new PrintPPOutputPPCallbacks(PP, *OS, DisableLineMarkers, DumpDefines);
PP.AddPragmaHandler(0, new UnknownPragmaHandler("#pragma", Callbacks));
PP.AddPragmaHandler("GCC", new UnknownPragmaHandler("#pragma GCC",
Callbacks));
PP.setPPCallbacks(Callbacks);
// After we have configured the preprocessor, enter the main file.
PP.EnterMainSourceFile();
// Consume all of the tokens that come from the predefines buffer. Those
// should not be emitted into the output and are guaranteed to be at the
// start.
const SourceManager &SourceMgr = PP.getSourceManager();
Token Tok;
do PP.Lex(Tok);
while (Tok.isNot(tok::eof) && Tok.getLocation().isFileID() &&
!strcmp(SourceMgr.getPresumedLoc(Tok.getLocation()).getFilename(),
"<built-in>"));
// Read all the preprocessed tokens, printing them out to the stream.
PrintPreprocessedTokens(PP, Tok, Callbacks, *OS);
*OS << '\n';
}