forked from OSchip/llvm-project
911 lines
34 KiB
C++
911 lines
34 KiB
C++
//===--- MacroExpansion.cpp - Top level Macro Expansion -------------------===//
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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 top level handling of macro expasion for the
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// preprocessor.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Lex/Preprocessor.h"
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#include "MacroArgs.h"
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#include "clang/Lex/MacroInfo.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Basic/FileManager.h"
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#include "clang/Basic/TargetInfo.h"
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#include "clang/Lex/LexDiagnostic.h"
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#include "clang/Lex/CodeCompletionHandler.h"
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#include "clang/Lex/ExternalPreprocessorSource.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/Config/config.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cstdio>
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#include <ctime>
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using namespace clang;
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MacroInfo *Preprocessor::getInfoForMacro(IdentifierInfo *II) const {
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assert(II->hasMacroDefinition() && "Identifier is not a macro!");
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llvm::DenseMap<IdentifierInfo*, MacroInfo*>::const_iterator Pos
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= Macros.find(II);
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if (Pos == Macros.end()) {
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// Load this macro from the external source.
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getExternalSource()->LoadMacroDefinition(II);
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Pos = Macros.find(II);
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}
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assert(Pos != Macros.end() && "Identifier macro info is missing!");
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return Pos->second;
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}
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/// setMacroInfo - Specify a macro for this identifier.
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///
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void Preprocessor::setMacroInfo(IdentifierInfo *II, MacroInfo *MI) {
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if (MI) {
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Macros[II] = MI;
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II->setHasMacroDefinition(true);
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} else if (II->hasMacroDefinition()) {
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Macros.erase(II);
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II->setHasMacroDefinition(false);
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}
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}
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/// RegisterBuiltinMacro - Register the specified identifier in the identifier
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/// table and mark it as a builtin macro to be expanded.
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static IdentifierInfo *RegisterBuiltinMacro(Preprocessor &PP, const char *Name){
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// Get the identifier.
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IdentifierInfo *Id = PP.getIdentifierInfo(Name);
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// Mark it as being a macro that is builtin.
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MacroInfo *MI = PP.AllocateMacroInfo(SourceLocation());
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MI->setIsBuiltinMacro();
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PP.setMacroInfo(Id, MI);
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return Id;
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}
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/// RegisterBuiltinMacros - Register builtin macros, such as __LINE__ with the
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/// identifier table.
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void Preprocessor::RegisterBuiltinMacros() {
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Ident__LINE__ = RegisterBuiltinMacro(*this, "__LINE__");
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Ident__FILE__ = RegisterBuiltinMacro(*this, "__FILE__");
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Ident__DATE__ = RegisterBuiltinMacro(*this, "__DATE__");
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Ident__TIME__ = RegisterBuiltinMacro(*this, "__TIME__");
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Ident__COUNTER__ = RegisterBuiltinMacro(*this, "__COUNTER__");
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Ident_Pragma = RegisterBuiltinMacro(*this, "_Pragma");
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// GCC Extensions.
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Ident__BASE_FILE__ = RegisterBuiltinMacro(*this, "__BASE_FILE__");
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Ident__INCLUDE_LEVEL__ = RegisterBuiltinMacro(*this, "__INCLUDE_LEVEL__");
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Ident__TIMESTAMP__ = RegisterBuiltinMacro(*this, "__TIMESTAMP__");
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// Clang Extensions.
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Ident__has_feature = RegisterBuiltinMacro(*this, "__has_feature");
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Ident__has_builtin = RegisterBuiltinMacro(*this, "__has_builtin");
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Ident__has_attribute = RegisterBuiltinMacro(*this, "__has_attribute");
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Ident__has_include = RegisterBuiltinMacro(*this, "__has_include");
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Ident__has_include_next = RegisterBuiltinMacro(*this, "__has_include_next");
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// Microsoft Extensions.
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if (Features.Microsoft)
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Ident__pragma = RegisterBuiltinMacro(*this, "__pragma");
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else
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Ident__pragma = 0;
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}
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/// isTrivialSingleTokenExpansion - Return true if MI, which has a single token
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/// in its expansion, currently expands to that token literally.
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static bool isTrivialSingleTokenExpansion(const MacroInfo *MI,
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const IdentifierInfo *MacroIdent,
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Preprocessor &PP) {
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IdentifierInfo *II = MI->getReplacementToken(0).getIdentifierInfo();
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// If the token isn't an identifier, it's always literally expanded.
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if (II == 0) return true;
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// If the identifier is a macro, and if that macro is enabled, it may be
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// expanded so it's not a trivial expansion.
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if (II->hasMacroDefinition() && PP.getMacroInfo(II)->isEnabled() &&
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// Fast expanding "#define X X" is ok, because X would be disabled.
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II != MacroIdent)
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return false;
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// If this is an object-like macro invocation, it is safe to trivially expand
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// it.
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if (MI->isObjectLike()) return true;
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// If this is a function-like macro invocation, it's safe to trivially expand
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// as long as the identifier is not a macro argument.
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for (MacroInfo::arg_iterator I = MI->arg_begin(), E = MI->arg_end();
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I != E; ++I)
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if (*I == II)
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return false; // Identifier is a macro argument.
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return true;
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}
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/// isNextPPTokenLParen - Determine whether the next preprocessor token to be
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/// lexed is a '('. If so, consume the token and return true, if not, this
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/// method should have no observable side-effect on the lexed tokens.
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bool Preprocessor::isNextPPTokenLParen() {
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// Do some quick tests for rejection cases.
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unsigned Val;
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if (CurLexer)
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Val = CurLexer->isNextPPTokenLParen();
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else if (CurPTHLexer)
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Val = CurPTHLexer->isNextPPTokenLParen();
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else
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Val = CurTokenLexer->isNextTokenLParen();
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if (Val == 2) {
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// We have run off the end. If it's a source file we don't
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// examine enclosing ones (C99 5.1.1.2p4). Otherwise walk up the
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// macro stack.
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if (CurPPLexer)
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return false;
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for (unsigned i = IncludeMacroStack.size(); i != 0; --i) {
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IncludeStackInfo &Entry = IncludeMacroStack[i-1];
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if (Entry.TheLexer)
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Val = Entry.TheLexer->isNextPPTokenLParen();
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else if (Entry.ThePTHLexer)
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Val = Entry.ThePTHLexer->isNextPPTokenLParen();
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else
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Val = Entry.TheTokenLexer->isNextTokenLParen();
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if (Val != 2)
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break;
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// Ran off the end of a source file?
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if (Entry.ThePPLexer)
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return false;
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}
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}
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// Okay, if we know that the token is a '(', lex it and return. Otherwise we
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// have found something that isn't a '(' or we found the end of the
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// translation unit. In either case, return false.
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return Val == 1;
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}
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/// HandleMacroExpandedIdentifier - If an identifier token is read that is to be
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/// expanded as a macro, handle it and return the next token as 'Identifier'.
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bool Preprocessor::HandleMacroExpandedIdentifier(Token &Identifier,
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MacroInfo *MI) {
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if (Callbacks) Callbacks->MacroExpands(Identifier, MI);
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// If this is a macro expansion in the "#if !defined(x)" line for the file,
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// then the macro could expand to different things in other contexts, we need
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// to disable the optimization in this case.
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if (CurPPLexer) CurPPLexer->MIOpt.ExpandedMacro();
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// If this is a builtin macro, like __LINE__ or _Pragma, handle it specially.
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if (MI->isBuiltinMacro()) {
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ExpandBuiltinMacro(Identifier);
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return false;
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}
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/// Args - If this is a function-like macro expansion, this contains,
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/// for each macro argument, the list of tokens that were provided to the
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/// invocation.
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MacroArgs *Args = 0;
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// Remember where the end of the instantiation occurred. For an object-like
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// macro, this is the identifier. For a function-like macro, this is the ')'.
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SourceLocation InstantiationEnd = Identifier.getLocation();
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// If this is a function-like macro, read the arguments.
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if (MI->isFunctionLike()) {
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// C99 6.10.3p10: If the preprocessing token immediately after the the macro
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// name isn't a '(', this macro should not be expanded.
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if (!isNextPPTokenLParen())
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return true;
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// Remember that we are now parsing the arguments to a macro invocation.
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// Preprocessor directives used inside macro arguments are not portable, and
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// this enables the warning.
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InMacroArgs = true;
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Args = ReadFunctionLikeMacroArgs(Identifier, MI, InstantiationEnd);
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// Finished parsing args.
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InMacroArgs = false;
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// If there was an error parsing the arguments, bail out.
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if (Args == 0) return false;
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++NumFnMacroExpanded;
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} else {
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++NumMacroExpanded;
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}
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// Notice that this macro has been used.
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markMacroAsUsed(MI);
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// If we started lexing a macro, enter the macro expansion body.
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// If this macro expands to no tokens, don't bother to push it onto the
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// expansion stack, only to take it right back off.
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if (MI->getNumTokens() == 0) {
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// No need for arg info.
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if (Args) Args->destroy(*this);
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// Ignore this macro use, just return the next token in the current
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// buffer.
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bool HadLeadingSpace = Identifier.hasLeadingSpace();
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bool IsAtStartOfLine = Identifier.isAtStartOfLine();
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Lex(Identifier);
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// If the identifier isn't on some OTHER line, inherit the leading
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// whitespace/first-on-a-line property of this token. This handles
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// stuff like "! XX," -> "! ," and " XX," -> " ,", when XX is
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// empty.
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if (!Identifier.isAtStartOfLine()) {
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if (IsAtStartOfLine) Identifier.setFlag(Token::StartOfLine);
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if (HadLeadingSpace) Identifier.setFlag(Token::LeadingSpace);
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}
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Identifier.setFlag(Token::LeadingEmptyMacro);
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++NumFastMacroExpanded;
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return false;
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} else if (MI->getNumTokens() == 1 &&
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isTrivialSingleTokenExpansion(MI, Identifier.getIdentifierInfo(),
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*this)) {
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// Otherwise, if this macro expands into a single trivially-expanded
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// token: expand it now. This handles common cases like
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// "#define VAL 42".
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// No need for arg info.
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if (Args) Args->destroy(*this);
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// Propagate the isAtStartOfLine/hasLeadingSpace markers of the macro
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// identifier to the expanded token.
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bool isAtStartOfLine = Identifier.isAtStartOfLine();
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bool hasLeadingSpace = Identifier.hasLeadingSpace();
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// Remember where the token is instantiated.
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SourceLocation InstantiateLoc = Identifier.getLocation();
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// Replace the result token.
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Identifier = MI->getReplacementToken(0);
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// Restore the StartOfLine/LeadingSpace markers.
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Identifier.setFlagValue(Token::StartOfLine , isAtStartOfLine);
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Identifier.setFlagValue(Token::LeadingSpace, hasLeadingSpace);
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// Update the tokens location to include both its instantiation and physical
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// locations.
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SourceLocation Loc =
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SourceMgr.createInstantiationLoc(Identifier.getLocation(), InstantiateLoc,
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InstantiationEnd,Identifier.getLength());
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Identifier.setLocation(Loc);
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// If this is a disabled macro or #define X X, we must mark the result as
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// unexpandable.
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if (IdentifierInfo *NewII = Identifier.getIdentifierInfo()) {
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if (MacroInfo *NewMI = getMacroInfo(NewII))
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if (!NewMI->isEnabled() || NewMI == MI)
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Identifier.setFlag(Token::DisableExpand);
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}
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// Since this is not an identifier token, it can't be macro expanded, so
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// we're done.
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++NumFastMacroExpanded;
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return false;
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}
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// Start expanding the macro.
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EnterMacro(Identifier, InstantiationEnd, Args);
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// Now that the macro is at the top of the include stack, ask the
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// preprocessor to read the next token from it.
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Lex(Identifier);
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return false;
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}
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/// ReadFunctionLikeMacroArgs - After reading "MACRO" and knowing that the next
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/// token is the '(' of the macro, this method is invoked to read all of the
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/// actual arguments specified for the macro invocation. This returns null on
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/// error.
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MacroArgs *Preprocessor::ReadFunctionLikeMacroArgs(Token &MacroName,
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MacroInfo *MI,
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SourceLocation &MacroEnd) {
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// The number of fixed arguments to parse.
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unsigned NumFixedArgsLeft = MI->getNumArgs();
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bool isVariadic = MI->isVariadic();
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// Outer loop, while there are more arguments, keep reading them.
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Token Tok;
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// Read arguments as unexpanded tokens. This avoids issues, e.g., where
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// an argument value in a macro could expand to ',' or '(' or ')'.
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LexUnexpandedToken(Tok);
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assert(Tok.is(tok::l_paren) && "Error computing l-paren-ness?");
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// ArgTokens - Build up a list of tokens that make up each argument. Each
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// argument is separated by an EOF token. Use a SmallVector so we can avoid
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// heap allocations in the common case.
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llvm::SmallVector<Token, 64> ArgTokens;
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unsigned NumActuals = 0;
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while (Tok.isNot(tok::r_paren)) {
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assert((Tok.is(tok::l_paren) || Tok.is(tok::comma)) &&
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"only expect argument separators here");
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unsigned ArgTokenStart = ArgTokens.size();
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SourceLocation ArgStartLoc = Tok.getLocation();
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// C99 6.10.3p11: Keep track of the number of l_parens we have seen. Note
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// that we already consumed the first one.
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unsigned NumParens = 0;
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while (1) {
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// Read arguments as unexpanded tokens. This avoids issues, e.g., where
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// an argument value in a macro could expand to ',' or '(' or ')'.
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LexUnexpandedToken(Tok);
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if (Tok.is(tok::code_completion)) {
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if (CodeComplete)
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CodeComplete->CodeCompleteMacroArgument(MacroName.getIdentifierInfo(),
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MI, NumActuals);
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LexUnexpandedToken(Tok);
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}
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if (Tok.is(tok::eof) || Tok.is(tok::eod)) { // "#if f(<eof>" & "#if f(\n"
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Diag(MacroName, diag::err_unterm_macro_invoc);
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// Do not lose the EOF/EOD. Return it to the client.
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MacroName = Tok;
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return 0;
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} else if (Tok.is(tok::r_paren)) {
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// If we found the ) token, the macro arg list is done.
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if (NumParens-- == 0) {
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MacroEnd = Tok.getLocation();
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break;
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}
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} else if (Tok.is(tok::l_paren)) {
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++NumParens;
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} else if (Tok.is(tok::comma) && NumParens == 0) {
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// Comma ends this argument if there are more fixed arguments expected.
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// However, if this is a variadic macro, and this is part of the
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// variadic part, then the comma is just an argument token.
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if (!isVariadic) break;
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if (NumFixedArgsLeft > 1)
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break;
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} else if (Tok.is(tok::comment) && !KeepMacroComments) {
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// If this is a comment token in the argument list and we're just in
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// -C mode (not -CC mode), discard the comment.
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continue;
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} else if (Tok.getIdentifierInfo() != 0) {
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// Reading macro arguments can cause macros that we are currently
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// expanding from to be popped off the expansion stack. Doing so causes
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// them to be reenabled for expansion. Here we record whether any
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// identifiers we lex as macro arguments correspond to disabled macros.
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// If so, we mark the token as noexpand. This is a subtle aspect of
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// C99 6.10.3.4p2.
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if (MacroInfo *MI = getMacroInfo(Tok.getIdentifierInfo()))
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if (!MI->isEnabled())
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Tok.setFlag(Token::DisableExpand);
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}
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ArgTokens.push_back(Tok);
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}
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// If this was an empty argument list foo(), don't add this as an empty
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// argument.
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if (ArgTokens.empty() && Tok.getKind() == tok::r_paren)
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break;
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// If this is not a variadic macro, and too many args were specified, emit
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// an error.
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if (!isVariadic && NumFixedArgsLeft == 0) {
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if (ArgTokens.size() != ArgTokenStart)
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ArgStartLoc = ArgTokens[ArgTokenStart].getLocation();
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// Emit the diagnostic at the macro name in case there is a missing ).
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// Emitting it at the , could be far away from the macro name.
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Diag(ArgStartLoc, diag::err_too_many_args_in_macro_invoc);
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return 0;
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}
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// Empty arguments are standard in C99 and C++0x, and are supported as an extension in
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// other modes.
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if (ArgTokens.size() == ArgTokenStart && !Features.C99 && !Features.CPlusPlus0x)
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Diag(Tok, diag::ext_empty_fnmacro_arg);
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// Add a marker EOF token to the end of the token list for this argument.
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Token EOFTok;
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EOFTok.startToken();
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EOFTok.setKind(tok::eof);
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EOFTok.setLocation(Tok.getLocation());
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EOFTok.setLength(0);
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ArgTokens.push_back(EOFTok);
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++NumActuals;
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assert(NumFixedArgsLeft != 0 && "Too many arguments parsed");
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--NumFixedArgsLeft;
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}
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// Okay, we either found the r_paren. Check to see if we parsed too few
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// arguments.
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unsigned MinArgsExpected = MI->getNumArgs();
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// See MacroArgs instance var for description of this.
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bool isVarargsElided = false;
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if (NumActuals < MinArgsExpected) {
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// There are several cases where too few arguments is ok, handle them now.
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if (NumActuals == 0 && MinArgsExpected == 1) {
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// #define A(X) or #define A(...) ---> A()
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// If there is exactly one argument, and that argument is missing,
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// then we have an empty "()" argument empty list. This is fine, even if
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// the macro expects one argument (the argument is just empty).
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isVarargsElided = MI->isVariadic();
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} else if (MI->isVariadic() &&
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(NumActuals+1 == MinArgsExpected || // A(x, ...) -> A(X)
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(NumActuals == 0 && MinArgsExpected == 2))) {// A(x,...) -> A()
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// Varargs where the named vararg parameter is missing: ok as extension.
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// #define A(x, ...)
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// A("blah")
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Diag(Tok, diag::ext_missing_varargs_arg);
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// Remember this occurred, allowing us to elide the comma when used for
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// cases like:
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// #define A(x, foo...) blah(a, ## foo)
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// #define B(x, ...) blah(a, ## __VA_ARGS__)
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// #define C(...) blah(a, ## __VA_ARGS__)
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// A(x) B(x) C()
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isVarargsElided = true;
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} else {
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// Otherwise, emit the error.
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Diag(Tok, diag::err_too_few_args_in_macro_invoc);
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return 0;
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}
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// Add a marker EOF token to the end of the token list for this argument.
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SourceLocation EndLoc = Tok.getLocation();
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Tok.startToken();
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|
Tok.setKind(tok::eof);
|
|
Tok.setLocation(EndLoc);
|
|
Tok.setLength(0);
|
|
ArgTokens.push_back(Tok);
|
|
|
|
// If we expect two arguments, add both as empty.
|
|
if (NumActuals == 0 && MinArgsExpected == 2)
|
|
ArgTokens.push_back(Tok);
|
|
|
|
} else if (NumActuals > MinArgsExpected && !MI->isVariadic()) {
|
|
// Emit the diagnostic at the macro name in case there is a missing ).
|
|
// Emitting it at the , could be far away from the macro name.
|
|
Diag(MacroName, diag::err_too_many_args_in_macro_invoc);
|
|
return 0;
|
|
}
|
|
|
|
return MacroArgs::create(MI, ArgTokens.data(), ArgTokens.size(),
|
|
isVarargsElided, *this);
|
|
}
|
|
|
|
/// ComputeDATE_TIME - Compute the current time, enter it into the specified
|
|
/// scratch buffer, then return DATELoc/TIMELoc locations with the position of
|
|
/// the identifier tokens inserted.
|
|
static void ComputeDATE_TIME(SourceLocation &DATELoc, SourceLocation &TIMELoc,
|
|
Preprocessor &PP) {
|
|
time_t TT = time(0);
|
|
struct tm *TM = localtime(&TT);
|
|
|
|
static const char * const Months[] = {
|
|
"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"
|
|
};
|
|
|
|
char TmpBuffer[32];
|
|
#ifdef LLVM_ON_WIN32
|
|
sprintf(TmpBuffer, "\"%s %2d %4d\"", Months[TM->tm_mon], TM->tm_mday,
|
|
TM->tm_year+1900);
|
|
#else
|
|
snprintf(TmpBuffer, sizeof(TmpBuffer), "\"%s %2d %4d\"", Months[TM->tm_mon], TM->tm_mday,
|
|
TM->tm_year+1900);
|
|
#endif
|
|
|
|
Token TmpTok;
|
|
TmpTok.startToken();
|
|
PP.CreateString(TmpBuffer, strlen(TmpBuffer), TmpTok);
|
|
DATELoc = TmpTok.getLocation();
|
|
|
|
#ifdef LLVM_ON_WIN32
|
|
sprintf(TmpBuffer, "\"%02d:%02d:%02d\"", TM->tm_hour, TM->tm_min, TM->tm_sec);
|
|
#else
|
|
snprintf(TmpBuffer, sizeof(TmpBuffer), "\"%02d:%02d:%02d\"", TM->tm_hour, TM->tm_min, TM->tm_sec);
|
|
#endif
|
|
PP.CreateString(TmpBuffer, strlen(TmpBuffer), TmpTok);
|
|
TIMELoc = TmpTok.getLocation();
|
|
}
|
|
|
|
|
|
/// HasFeature - Return true if we recognize and implement the specified feature
|
|
/// specified by the identifier.
|
|
static bool HasFeature(const Preprocessor &PP, const IdentifierInfo *II) {
|
|
const LangOptions &LangOpts = PP.getLangOptions();
|
|
|
|
return llvm::StringSwitch<bool>(II->getName())
|
|
.Case("attribute_analyzer_noreturn", true)
|
|
.Case("attribute_availability", true)
|
|
.Case("attribute_cf_returns_not_retained", true)
|
|
.Case("attribute_cf_returns_retained", true)
|
|
.Case("attribute_deprecated_with_message", true)
|
|
.Case("attribute_ext_vector_type", true)
|
|
.Case("attribute_ns_returns_not_retained", true)
|
|
.Case("attribute_ns_returns_retained", true)
|
|
.Case("attribute_ns_consumes_self", true)
|
|
.Case("attribute_ns_consumed", true)
|
|
.Case("attribute_cf_consumed", true)
|
|
.Case("attribute_objc_ivar_unused", true)
|
|
.Case("attribute_objc_method_family", true)
|
|
.Case("attribute_overloadable", true)
|
|
.Case("attribute_unavailable_with_message", true)
|
|
.Case("blocks", LangOpts.Blocks)
|
|
.Case("cxx_exceptions", LangOpts.Exceptions)
|
|
.Case("cxx_rtti", LangOpts.RTTI)
|
|
.Case("enumerator_attributes", true)
|
|
.Case("generic_selections", true)
|
|
.Case("objc_nonfragile_abi", LangOpts.ObjCNonFragileABI)
|
|
.Case("objc_weak_class", LangOpts.ObjCNonFragileABI)
|
|
.Case("ownership_holds", true)
|
|
.Case("ownership_returns", true)
|
|
.Case("ownership_takes", true)
|
|
// C++0x features
|
|
.Case("cxx_attributes", LangOpts.CPlusPlus0x)
|
|
.Case("cxx_auto_type", LangOpts.CPlusPlus0x)
|
|
.Case("cxx_decltype", LangOpts.CPlusPlus0x)
|
|
.Case("cxx_default_function_template_args", LangOpts.CPlusPlus0x)
|
|
.Case("cxx_deleted_functions", LangOpts.CPlusPlus0x)
|
|
.Case("cxx_inline_namespaces", LangOpts.CPlusPlus0x)
|
|
//.Case("cxx_lambdas", false)
|
|
.Case("cxx_noexcept", LangOpts.CPlusPlus0x)
|
|
//.Case("cxx_nullptr", false)
|
|
.Case("cxx_override_control", LangOpts.CPlusPlus0x)
|
|
.Case("cxx_range_for", LangOpts.CPlusPlus0x)
|
|
.Case("cxx_reference_qualified_functions", LangOpts.CPlusPlus0x)
|
|
.Case("cxx_rvalue_references", LangOpts.CPlusPlus0x)
|
|
.Case("cxx_strong_enums", LangOpts.CPlusPlus0x)
|
|
.Case("cxx_static_assert", LangOpts.CPlusPlus0x)
|
|
.Case("cxx_trailing_return", LangOpts.CPlusPlus0x)
|
|
.Case("cxx_variadic_templates", LangOpts.CPlusPlus0x)
|
|
// Type traits
|
|
.Case("has_nothrow_assign", LangOpts.CPlusPlus)
|
|
.Case("has_nothrow_copy", LangOpts.CPlusPlus)
|
|
.Case("has_nothrow_constructor", LangOpts.CPlusPlus)
|
|
.Case("has_trivial_assign", LangOpts.CPlusPlus)
|
|
.Case("has_trivial_copy", LangOpts.CPlusPlus)
|
|
.Case("has_trivial_constructor", LangOpts.CPlusPlus)
|
|
.Case("has_trivial_destructor", LangOpts.CPlusPlus)
|
|
.Case("has_virtual_destructor", LangOpts.CPlusPlus)
|
|
.Case("is_abstract", LangOpts.CPlusPlus)
|
|
.Case("is_base_of", LangOpts.CPlusPlus)
|
|
.Case("is_class", LangOpts.CPlusPlus)
|
|
.Case("is_convertible_to", LangOpts.CPlusPlus)
|
|
.Case("is_empty", LangOpts.CPlusPlus)
|
|
.Case("is_enum", LangOpts.CPlusPlus)
|
|
.Case("is_literal", LangOpts.CPlusPlus)
|
|
.Case("is_pod", LangOpts.CPlusPlus)
|
|
.Case("is_polymorphic", LangOpts.CPlusPlus)
|
|
.Case("is_trivial", LangOpts.CPlusPlus)
|
|
.Case("is_union", LangOpts.CPlusPlus)
|
|
.Case("tls", PP.getTargetInfo().isTLSSupported())
|
|
.Default(false);
|
|
}
|
|
|
|
/// HasAttribute - Return true if we recognize and implement the attribute
|
|
/// specified by the given identifier.
|
|
static bool HasAttribute(const IdentifierInfo *II) {
|
|
return llvm::StringSwitch<bool>(II->getName())
|
|
#include "clang/Lex/AttrSpellings.inc"
|
|
.Default(false);
|
|
}
|
|
|
|
/// EvaluateHasIncludeCommon - Process a '__has_include("path")'
|
|
/// or '__has_include_next("path")' expression.
|
|
/// Returns true if successful.
|
|
static bool EvaluateHasIncludeCommon(Token &Tok,
|
|
IdentifierInfo *II, Preprocessor &PP,
|
|
const DirectoryLookup *LookupFrom) {
|
|
SourceLocation LParenLoc;
|
|
|
|
// Get '('.
|
|
PP.LexNonComment(Tok);
|
|
|
|
// Ensure we have a '('.
|
|
if (Tok.isNot(tok::l_paren)) {
|
|
PP.Diag(Tok.getLocation(), diag::err_pp_missing_lparen) << II->getName();
|
|
return false;
|
|
}
|
|
|
|
// Save '(' location for possible missing ')' message.
|
|
LParenLoc = Tok.getLocation();
|
|
|
|
// Get the file name.
|
|
PP.getCurrentLexer()->LexIncludeFilename(Tok);
|
|
|
|
// Reserve a buffer to get the spelling.
|
|
llvm::SmallString<128> FilenameBuffer;
|
|
llvm::StringRef Filename;
|
|
SourceLocation EndLoc;
|
|
|
|
switch (Tok.getKind()) {
|
|
case tok::eod:
|
|
// If the token kind is EOD, the error has already been diagnosed.
|
|
return false;
|
|
|
|
case tok::angle_string_literal:
|
|
case tok::string_literal: {
|
|
bool Invalid = false;
|
|
Filename = PP.getSpelling(Tok, FilenameBuffer, &Invalid);
|
|
if (Invalid)
|
|
return false;
|
|
break;
|
|
}
|
|
|
|
case tok::less:
|
|
// This could be a <foo/bar.h> file coming from a macro expansion. In this
|
|
// case, glue the tokens together into FilenameBuffer and interpret those.
|
|
FilenameBuffer.push_back('<');
|
|
if (PP.ConcatenateIncludeName(FilenameBuffer, EndLoc))
|
|
return false; // Found <eod> but no ">"? Diagnostic already emitted.
|
|
Filename = FilenameBuffer.str();
|
|
break;
|
|
default:
|
|
PP.Diag(Tok.getLocation(), diag::err_pp_expects_filename);
|
|
return false;
|
|
}
|
|
|
|
bool isAngled = PP.GetIncludeFilenameSpelling(Tok.getLocation(), Filename);
|
|
// If GetIncludeFilenameSpelling set the start ptr to null, there was an
|
|
// error.
|
|
if (Filename.empty())
|
|
return false;
|
|
|
|
// Search include directories.
|
|
const DirectoryLookup *CurDir;
|
|
const FileEntry *File =
|
|
PP.LookupFile(Filename, isAngled, LookupFrom, CurDir, NULL);
|
|
|
|
// Get the result value. Result = true means the file exists.
|
|
bool Result = File != 0;
|
|
|
|
// Get ')'.
|
|
PP.LexNonComment(Tok);
|
|
|
|
// Ensure we have a trailing ).
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
PP.Diag(Tok.getLocation(), diag::err_pp_missing_rparen) << II->getName();
|
|
PP.Diag(LParenLoc, diag::note_matching) << "(";
|
|
return false;
|
|
}
|
|
|
|
return Result;
|
|
}
|
|
|
|
/// EvaluateHasInclude - Process a '__has_include("path")' expression.
|
|
/// Returns true if successful.
|
|
static bool EvaluateHasInclude(Token &Tok, IdentifierInfo *II,
|
|
Preprocessor &PP) {
|
|
return EvaluateHasIncludeCommon(Tok, II, PP, NULL);
|
|
}
|
|
|
|
/// EvaluateHasIncludeNext - Process '__has_include_next("path")' expression.
|
|
/// Returns true if successful.
|
|
static bool EvaluateHasIncludeNext(Token &Tok,
|
|
IdentifierInfo *II, Preprocessor &PP) {
|
|
// __has_include_next is like __has_include, except that we start
|
|
// searching after the current found directory. If we can't do this,
|
|
// issue a diagnostic.
|
|
const DirectoryLookup *Lookup = PP.GetCurDirLookup();
|
|
if (PP.isInPrimaryFile()) {
|
|
Lookup = 0;
|
|
PP.Diag(Tok, diag::pp_include_next_in_primary);
|
|
} else if (Lookup == 0) {
|
|
PP.Diag(Tok, diag::pp_include_next_absolute_path);
|
|
} else {
|
|
// Start looking up in the next directory.
|
|
++Lookup;
|
|
}
|
|
|
|
return EvaluateHasIncludeCommon(Tok, II, PP, Lookup);
|
|
}
|
|
|
|
/// ExpandBuiltinMacro - If an identifier token is read that is to be expanded
|
|
/// as a builtin macro, handle it and return the next token as 'Tok'.
|
|
void Preprocessor::ExpandBuiltinMacro(Token &Tok) {
|
|
// Figure out which token this is.
|
|
IdentifierInfo *II = Tok.getIdentifierInfo();
|
|
assert(II && "Can't be a macro without id info!");
|
|
|
|
// If this is an _Pragma or Microsoft __pragma directive, expand it,
|
|
// invoke the pragma handler, then lex the token after it.
|
|
if (II == Ident_Pragma)
|
|
return Handle_Pragma(Tok);
|
|
else if (II == Ident__pragma) // in non-MS mode this is null
|
|
return HandleMicrosoft__pragma(Tok);
|
|
|
|
++NumBuiltinMacroExpanded;
|
|
|
|
llvm::SmallString<128> TmpBuffer;
|
|
llvm::raw_svector_ostream OS(TmpBuffer);
|
|
|
|
// Set up the return result.
|
|
Tok.setIdentifierInfo(0);
|
|
Tok.clearFlag(Token::NeedsCleaning);
|
|
|
|
if (II == Ident__LINE__) {
|
|
// C99 6.10.8: "__LINE__: The presumed line number (within the current
|
|
// source file) of the current source line (an integer constant)". This can
|
|
// be affected by #line.
|
|
SourceLocation Loc = Tok.getLocation();
|
|
|
|
// Advance to the location of the first _, this might not be the first byte
|
|
// of the token if it starts with an escaped newline.
|
|
Loc = AdvanceToTokenCharacter(Loc, 0);
|
|
|
|
// One wrinkle here is that GCC expands __LINE__ to location of the *end* of
|
|
// a macro instantiation. This doesn't matter for object-like macros, but
|
|
// can matter for a function-like macro that expands to contain __LINE__.
|
|
// Skip down through instantiation points until we find a file loc for the
|
|
// end of the instantiation history.
|
|
Loc = SourceMgr.getInstantiationRange(Loc).second;
|
|
PresumedLoc PLoc = SourceMgr.getPresumedLoc(Loc);
|
|
|
|
// __LINE__ expands to a simple numeric value.
|
|
OS << (PLoc.isValid()? PLoc.getLine() : 1);
|
|
Tok.setKind(tok::numeric_constant);
|
|
} else if (II == Ident__FILE__ || II == Ident__BASE_FILE__) {
|
|
// C99 6.10.8: "__FILE__: The presumed name of the current source file (a
|
|
// character string literal)". This can be affected by #line.
|
|
PresumedLoc PLoc = SourceMgr.getPresumedLoc(Tok.getLocation());
|
|
|
|
// __BASE_FILE__ is a GNU extension that returns the top of the presumed
|
|
// #include stack instead of the current file.
|
|
if (II == Ident__BASE_FILE__ && PLoc.isValid()) {
|
|
SourceLocation NextLoc = PLoc.getIncludeLoc();
|
|
while (NextLoc.isValid()) {
|
|
PLoc = SourceMgr.getPresumedLoc(NextLoc);
|
|
if (PLoc.isInvalid())
|
|
break;
|
|
|
|
NextLoc = PLoc.getIncludeLoc();
|
|
}
|
|
}
|
|
|
|
// Escape this filename. Turn '\' -> '\\' '"' -> '\"'
|
|
llvm::SmallString<128> FN;
|
|
if (PLoc.isValid()) {
|
|
FN += PLoc.getFilename();
|
|
Lexer::Stringify(FN);
|
|
OS << '"' << FN.str() << '"';
|
|
}
|
|
Tok.setKind(tok::string_literal);
|
|
} else if (II == Ident__DATE__) {
|
|
if (!DATELoc.isValid())
|
|
ComputeDATE_TIME(DATELoc, TIMELoc, *this);
|
|
Tok.setKind(tok::string_literal);
|
|
Tok.setLength(strlen("\"Mmm dd yyyy\""));
|
|
Tok.setLocation(SourceMgr.createInstantiationLoc(DATELoc, Tok.getLocation(),
|
|
Tok.getLocation(),
|
|
Tok.getLength()));
|
|
return;
|
|
} else if (II == Ident__TIME__) {
|
|
if (!TIMELoc.isValid())
|
|
ComputeDATE_TIME(DATELoc, TIMELoc, *this);
|
|
Tok.setKind(tok::string_literal);
|
|
Tok.setLength(strlen("\"hh:mm:ss\""));
|
|
Tok.setLocation(SourceMgr.createInstantiationLoc(TIMELoc, Tok.getLocation(),
|
|
Tok.getLocation(),
|
|
Tok.getLength()));
|
|
return;
|
|
} else if (II == Ident__INCLUDE_LEVEL__) {
|
|
// Compute the presumed include depth of this token. This can be affected
|
|
// by GNU line markers.
|
|
unsigned Depth = 0;
|
|
|
|
PresumedLoc PLoc = SourceMgr.getPresumedLoc(Tok.getLocation());
|
|
if (PLoc.isValid()) {
|
|
PLoc = SourceMgr.getPresumedLoc(PLoc.getIncludeLoc());
|
|
for (; PLoc.isValid(); ++Depth)
|
|
PLoc = SourceMgr.getPresumedLoc(PLoc.getIncludeLoc());
|
|
}
|
|
|
|
// __INCLUDE_LEVEL__ expands to a simple numeric value.
|
|
OS << Depth;
|
|
Tok.setKind(tok::numeric_constant);
|
|
} else if (II == Ident__TIMESTAMP__) {
|
|
// MSVC, ICC, GCC, VisualAge C++ extension. The generated string should be
|
|
// of the form "Ddd Mmm dd hh::mm::ss yyyy", which is returned by asctime.
|
|
|
|
// Get the file that we are lexing out of. If we're currently lexing from
|
|
// a macro, dig into the include stack.
|
|
const FileEntry *CurFile = 0;
|
|
PreprocessorLexer *TheLexer = getCurrentFileLexer();
|
|
|
|
if (TheLexer)
|
|
CurFile = SourceMgr.getFileEntryForID(TheLexer->getFileID());
|
|
|
|
const char *Result;
|
|
if (CurFile) {
|
|
time_t TT = CurFile->getModificationTime();
|
|
struct tm *TM = localtime(&TT);
|
|
Result = asctime(TM);
|
|
} else {
|
|
Result = "??? ??? ?? ??:??:?? ????\n";
|
|
}
|
|
// Surround the string with " and strip the trailing newline.
|
|
OS << '"' << llvm::StringRef(Result, strlen(Result)-1) << '"';
|
|
Tok.setKind(tok::string_literal);
|
|
} else if (II == Ident__COUNTER__) {
|
|
// __COUNTER__ expands to a simple numeric value.
|
|
OS << CounterValue++;
|
|
Tok.setKind(tok::numeric_constant);
|
|
} else if (II == Ident__has_feature ||
|
|
II == Ident__has_builtin ||
|
|
II == Ident__has_attribute) {
|
|
// The argument to these two builtins should be a parenthesized identifier.
|
|
SourceLocation StartLoc = Tok.getLocation();
|
|
|
|
bool IsValid = false;
|
|
IdentifierInfo *FeatureII = 0;
|
|
|
|
// Read the '('.
|
|
Lex(Tok);
|
|
if (Tok.is(tok::l_paren)) {
|
|
// Read the identifier
|
|
Lex(Tok);
|
|
if (Tok.is(tok::identifier)) {
|
|
FeatureII = Tok.getIdentifierInfo();
|
|
|
|
// Read the ')'.
|
|
Lex(Tok);
|
|
if (Tok.is(tok::r_paren))
|
|
IsValid = true;
|
|
}
|
|
}
|
|
|
|
bool Value = false;
|
|
if (!IsValid)
|
|
Diag(StartLoc, diag::err_feature_check_malformed);
|
|
else if (II == Ident__has_builtin) {
|
|
// Check for a builtin is trivial.
|
|
Value = FeatureII->getBuiltinID() != 0;
|
|
} else if (II == Ident__has_attribute)
|
|
Value = HasAttribute(FeatureII);
|
|
else {
|
|
assert(II == Ident__has_feature && "Must be feature check");
|
|
Value = HasFeature(*this, FeatureII);
|
|
}
|
|
|
|
OS << (int)Value;
|
|
Tok.setKind(tok::numeric_constant);
|
|
} else if (II == Ident__has_include ||
|
|
II == Ident__has_include_next) {
|
|
// The argument to these two builtins should be a parenthesized
|
|
// file name string literal using angle brackets (<>) or
|
|
// double-quotes ("").
|
|
bool Value;
|
|
if (II == Ident__has_include)
|
|
Value = EvaluateHasInclude(Tok, II, *this);
|
|
else
|
|
Value = EvaluateHasIncludeNext(Tok, II, *this);
|
|
OS << (int)Value;
|
|
Tok.setKind(tok::numeric_constant);
|
|
} else {
|
|
assert(0 && "Unknown identifier!");
|
|
}
|
|
CreateString(OS.str().data(), OS.str().size(), Tok, Tok.getLocation());
|
|
}
|
|
|
|
void Preprocessor::markMacroAsUsed(MacroInfo *MI) {
|
|
// If the 'used' status changed, and the macro requires 'unused' warning,
|
|
// remove its SourceLocation from the warn-for-unused-macro locations.
|
|
if (MI->isWarnIfUnused() && !MI->isUsed())
|
|
WarnUnusedMacroLocs.erase(MI->getDefinitionLoc());
|
|
MI->setIsUsed(true);
|
|
}
|