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f160b5f9e1
two empty arguments. Also, add an assert so that this bug manifests as an assertion failure, not a valgrind problem. This fixes rdar://6880648 - [cpp] crash in ArgNeedsPreexpansion llvm-svn: 71616
241 lines
8.9 KiB
C++
241 lines
8.9 KiB
C++
//===--- TokenLexer.cpp - Lex from a token stream -------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// 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 TokenLexer interface.
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//
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//===----------------------------------------------------------------------===//
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#include "MacroArgs.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/Lex/LexDiagnostic.h"
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using namespace clang;
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/// MacroArgs ctor function - This destroys the vector passed in.
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MacroArgs *MacroArgs::create(const MacroInfo *MI,
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const Token *UnexpArgTokens,
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unsigned NumToks, bool VarargsElided) {
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assert(MI->isFunctionLike() &&
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"Can't have args for an object-like macro!");
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// Allocate memory for the MacroArgs object with the lexer tokens at the end.
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MacroArgs *Result = (MacroArgs*)malloc(sizeof(MacroArgs) +
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NumToks*sizeof(Token));
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// Construct the macroargs object.
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new (Result) MacroArgs(NumToks, VarargsElided);
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// Copy the actual unexpanded tokens to immediately after the result ptr.
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if (NumToks)
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memcpy(const_cast<Token*>(Result->getUnexpArgument(0)),
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UnexpArgTokens, NumToks*sizeof(Token));
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return Result;
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}
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/// destroy - Destroy and deallocate the memory for this object.
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///
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void MacroArgs::destroy() {
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// Run the dtor to deallocate the vectors.
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this->~MacroArgs();
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// Release the memory for the object.
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free(this);
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}
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/// getArgLength - Given a pointer to an expanded or unexpanded argument,
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/// return the number of tokens, not counting the EOF, that make up the
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/// argument.
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unsigned MacroArgs::getArgLength(const Token *ArgPtr) {
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unsigned NumArgTokens = 0;
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for (; ArgPtr->isNot(tok::eof); ++ArgPtr)
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++NumArgTokens;
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return NumArgTokens;
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}
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/// getUnexpArgument - Return the unexpanded tokens for the specified formal.
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///
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const Token *MacroArgs::getUnexpArgument(unsigned Arg) const {
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// The unexpanded argument tokens start immediately after the MacroArgs object
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// in memory.
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const Token *Start = (const Token *)(this+1);
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const Token *Result = Start;
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// Scan to find Arg.
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for (; Arg; ++Result) {
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assert(Result < Start+NumUnexpArgTokens && "Invalid arg #");
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if (Result->is(tok::eof))
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--Arg;
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}
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assert(Result < Start+NumUnexpArgTokens && "Invalid arg #");
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return Result;
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}
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/// ArgNeedsPreexpansion - If we can prove that the argument won't be affected
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/// by pre-expansion, return false. Otherwise, conservatively return true.
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bool MacroArgs::ArgNeedsPreexpansion(const Token *ArgTok,
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Preprocessor &PP) const {
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// If there are no identifiers in the argument list, or if the identifiers are
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// known to not be macros, pre-expansion won't modify it.
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for (; ArgTok->isNot(tok::eof); ++ArgTok)
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if (IdentifierInfo *II = ArgTok->getIdentifierInfo()) {
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if (II->hasMacroDefinition() && PP.getMacroInfo(II)->isEnabled())
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// Return true even though the macro could be a function-like macro
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// without a following '(' token.
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return true;
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}
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return false;
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}
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/// getPreExpArgument - Return the pre-expanded form of the specified
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/// argument.
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const std::vector<Token> &
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MacroArgs::getPreExpArgument(unsigned Arg, Preprocessor &PP) {
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assert(Arg < NumUnexpArgTokens && "Invalid argument number!");
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// If we have already computed this, return it.
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if (PreExpArgTokens.empty())
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PreExpArgTokens.resize(NumUnexpArgTokens);
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std::vector<Token> &Result = PreExpArgTokens[Arg];
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if (!Result.empty()) return Result;
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const Token *AT = getUnexpArgument(Arg);
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unsigned NumToks = getArgLength(AT)+1; // Include the EOF.
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// Otherwise, we have to pre-expand this argument, populating Result. To do
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// this, we set up a fake TokenLexer to lex from the unexpanded argument
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// list. With this installed, we lex expanded tokens until we hit the EOF
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// token at the end of the unexp list.
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PP.EnterTokenStream(AT, NumToks, false /*disable expand*/,
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false /*owns tokens*/);
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// Lex all of the macro-expanded tokens into Result.
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do {
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Result.push_back(Token());
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Token &Tok = Result.back();
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PP.Lex(Tok);
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} while (Result.back().isNot(tok::eof));
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// Pop the token stream off the top of the stack. We know that the internal
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// pointer inside of it is to the "end" of the token stream, but the stack
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// will not otherwise be popped until the next token is lexed. The problem is
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// that the token may be lexed sometime after the vector of tokens itself is
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// destroyed, which would be badness.
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PP.RemoveTopOfLexerStack();
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return Result;
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}
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/// StringifyArgument - Implement C99 6.10.3.2p2, converting a sequence of
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/// tokens into the literal string token that should be produced by the C #
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/// preprocessor operator. If Charify is true, then it should be turned into
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/// a character literal for the Microsoft charize (#@) extension.
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///
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Token MacroArgs::StringifyArgument(const Token *ArgToks,
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Preprocessor &PP, bool Charify) {
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Token Tok;
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Tok.startToken();
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Tok.setKind(tok::string_literal);
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const Token *ArgTokStart = ArgToks;
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// Stringify all the tokens.
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llvm::SmallString<128> Result;
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Result += "\"";
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bool isFirst = true;
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for (; ArgToks->isNot(tok::eof); ++ArgToks) {
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const Token &Tok = *ArgToks;
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if (!isFirst && (Tok.hasLeadingSpace() || Tok.isAtStartOfLine()))
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Result += ' ';
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isFirst = false;
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// If this is a string or character constant, escape the token as specified
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// by 6.10.3.2p2.
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if (Tok.is(tok::string_literal) || // "foo"
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Tok.is(tok::wide_string_literal) || // L"foo"
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Tok.is(tok::char_constant)) { // 'x' and L'x'.
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std::string Str = Lexer::Stringify(PP.getSpelling(Tok));
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Result.append(Str.begin(), Str.end());
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} else {
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// Otherwise, just append the token. Do some gymnastics to get the token
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// in place and avoid copies where possible.
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unsigned CurStrLen = Result.size();
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Result.resize(CurStrLen+Tok.getLength());
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const char *BufPtr = &Result[CurStrLen];
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unsigned ActualTokLen = PP.getSpelling(Tok, BufPtr);
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// If getSpelling returned a pointer to an already uniqued version of the
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// string instead of filling in BufPtr, memcpy it onto our string.
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if (BufPtr != &Result[CurStrLen])
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memcpy(&Result[CurStrLen], BufPtr, ActualTokLen);
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// If the token was dirty, the spelling may be shorter than the token.
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if (ActualTokLen != Tok.getLength())
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Result.resize(CurStrLen+ActualTokLen);
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}
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}
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// If the last character of the string is a \, and if it isn't escaped, this
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// is an invalid string literal, diagnose it as specified in C99.
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if (Result.back() == '\\') {
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// Count the number of consequtive \ characters. If even, then they are
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// just escaped backslashes, otherwise it's an error.
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unsigned FirstNonSlash = Result.size()-2;
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// Guaranteed to find the starting " if nothing else.
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while (Result[FirstNonSlash] == '\\')
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--FirstNonSlash;
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if ((Result.size()-1-FirstNonSlash) & 1) {
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// Diagnose errors for things like: #define F(X) #X / F(\)
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PP.Diag(ArgToks[-1], diag::pp_invalid_string_literal);
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Result.pop_back(); // remove one of the \'s.
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}
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}
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Result += '"';
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// If this is the charify operation and the result is not a legal character
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// constant, diagnose it.
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if (Charify) {
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// First step, turn double quotes into single quotes:
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Result[0] = '\'';
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Result[Result.size()-1] = '\'';
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// Check for bogus character.
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bool isBad = false;
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if (Result.size() == 3)
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isBad = Result[1] == '\''; // ''' is not legal. '\' already fixed above.
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else
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isBad = (Result.size() != 4 || Result[1] != '\\'); // Not '\x'
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if (isBad) {
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PP.Diag(ArgTokStart[0], diag::err_invalid_character_to_charify);
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Result = "' '"; // Use something arbitrary, but legal.
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}
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}
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PP.CreateString(&Result[0], Result.size(), Tok);
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return Tok;
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}
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/// getStringifiedArgument - Compute, cache, and return the specified argument
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/// that has been 'stringified' as required by the # operator.
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const Token &MacroArgs::getStringifiedArgument(unsigned ArgNo,
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Preprocessor &PP) {
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assert(ArgNo < NumUnexpArgTokens && "Invalid argument number!");
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if (StringifiedArgs.empty()) {
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StringifiedArgs.resize(getNumArguments());
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memset(&StringifiedArgs[0], 0,
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sizeof(StringifiedArgs[0])*getNumArguments());
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}
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if (StringifiedArgs[ArgNo].isNot(tok::string_literal))
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StringifiedArgs[ArgNo] = StringifyArgument(getUnexpArgument(ArgNo), PP);
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return StringifiedArgs[ArgNo];
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}
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