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+//===- AsmParser.cpp - Parser for Assembly Files --------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This class implements the parser for assembly files.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCParser/AsmCond.h"
+#include "llvm/MC/MCParser/AsmLexer.h"
+#include "llvm/MC/MCParser/MCAsmParser.h"
+#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
+#include "llvm/MC/MCSectionMachO.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCDwarf.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetAsmParser.h"
+#include <vector>
+using namespace llvm;
+
+namespace {
+
+/// \brief Helper class for tracking macro definitions.
+struct Macro {
+ StringRef Name;
+ StringRef Body;
+
+public:
+ Macro(StringRef N, StringRef B) : Name(N), Body(B) {}
+};
+
+/// \brief Helper class for storing information about an active macro
+/// instantiation.
+struct MacroInstantiation {
+ /// The macro being instantiated.
+ const Macro *TheMacro;
+
+ /// The macro instantiation with substitutions.
+ MemoryBuffer *Instantiation;
+
+ /// The location of the instantiation.
+ SMLoc InstantiationLoc;
+
+ /// The location where parsing should resume upon instantiation completion.
+ SMLoc ExitLoc;
+
+public:
+ MacroInstantiation(const Macro *M, SMLoc IL, SMLoc EL,
+ const std::vector<std::vector<AsmToken> > &A);
+};
+
+/// \brief The concrete assembly parser instance.
+class AsmParser : public MCAsmParser {
+ friend class GenericAsmParser;
+
+ AsmParser(const AsmParser &); // DO NOT IMPLEMENT
+ void operator=(const AsmParser &); // DO NOT IMPLEMENT
+private:
+ AsmLexer Lexer;
+ MCContext &Ctx;
+ MCStreamer &Out;
+ SourceMgr &SrcMgr;
+ MCAsmParserExtension *GenericParser;
+ MCAsmParserExtension *PlatformParser;
+
+ /// This is the current buffer index we're lexing from as managed by the
+ /// SourceMgr object.
+ int CurBuffer;
+
+ AsmCond TheCondState;
+ std::vector<AsmCond> TheCondStack;
+
+ /// DirectiveMap - This is a table handlers for directives. Each handler is
+ /// invoked after the directive identifier is read and is responsible for
+ /// parsing and validating the rest of the directive. The handler is passed
+ /// in the directive name and the location of the directive keyword.
+ StringMap<std::pair<MCAsmParserExtension*, DirectiveHandler> > DirectiveMap;
+
+ /// MacroMap - Map of currently defined macros.
+ StringMap<Macro*> MacroMap;
+
+ /// ActiveMacros - Stack of active macro instantiations.
+ std::vector<MacroInstantiation*> ActiveMacros;
+
+ /// Boolean tracking whether macro substitution is enabled.
+ unsigned MacrosEnabled : 1;
+
+public:
+ AsmParser(const Target &T, SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
+ const MCAsmInfo &MAI);
+ ~AsmParser();
+
+ virtual bool Run(bool NoInitialTextSection, bool NoFinalize = false);
+
+ void AddDirectiveHandler(MCAsmParserExtension *Object,
+ StringRef Directive,
+ DirectiveHandler Handler) {
+ DirectiveMap[Directive] = std::make_pair(Object, Handler);
+ }
+
+public:
+ /// @name MCAsmParser Interface
+ /// {
+
+ virtual SourceMgr &getSourceManager() { return SrcMgr; }
+ virtual MCAsmLexer &getLexer() { return Lexer; }
+ virtual MCContext &getContext() { return Ctx; }
+ virtual MCStreamer &getStreamer() { return Out; }
+
+ virtual void Warning(SMLoc L, const Twine &Meg);
+ virtual bool Error(SMLoc L, const Twine &Msg);
+
+ const AsmToken &Lex();
+
+ bool ParseExpression(const MCExpr *&Res);
+ virtual bool ParseExpression(const MCExpr *&Res, SMLoc &EndLoc);
+ virtual bool ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc);
+ virtual bool ParseAbsoluteExpression(int64_t &Res);
+
+ /// }
+
+private:
+ bool ParseStatement();
+
+ bool HandleMacroEntry(StringRef Name, SMLoc NameLoc, const Macro *M);
+ void HandleMacroExit();
+
+ void PrintMacroInstantiations();
+ void PrintMessage(SMLoc Loc, const std::string &Msg, const char *Type) const;
+
+ /// EnterIncludeFile - Enter the specified file. This returns true on failure.
+ bool EnterIncludeFile(const std::string &Filename);
+
+ /// \brief Reset the current lexer position to that given by \arg Loc. The
+ /// current token is not set; clients should ensure Lex() is called
+ /// subsequently.
+ void JumpToLoc(SMLoc Loc);
+
+ void EatToEndOfStatement();
+
+ /// \brief Parse up to the end of statement and a return the contents from the
+ /// current token until the end of the statement; the current token on exit
+ /// will be either the EndOfStatement or EOF.
+ StringRef ParseStringToEndOfStatement();
+
+ bool ParseAssignment(StringRef Name);
+
+ bool ParsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc);
+ bool ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc);
+ bool ParseParenExpr(const MCExpr *&Res, SMLoc &EndLoc);
+
+ /// ParseIdentifier - Parse an identifier or string (as a quoted identifier)
+ /// and set \arg Res to the identifier contents.
+ bool ParseIdentifier(StringRef &Res);
+
+ // Directive Parsing.
+ bool ParseDirectiveAscii(bool ZeroTerminated); // ".ascii", ".asciiz"
+ bool ParseDirectiveValue(unsigned Size); // ".byte", ".long", ...
+ bool ParseDirectiveFill(); // ".fill"
+ bool ParseDirectiveSpace(); // ".space"
+ bool ParseDirectiveSet(); // ".set"
+ bool ParseDirectiveOrg(); // ".org"
+ // ".align{,32}", ".p2align{,w,l}"
+ bool ParseDirectiveAlign(bool IsPow2, unsigned ValueSize);
+
+ /// ParseDirectiveSymbolAttribute - Parse a directive like ".globl" which
+ /// accepts a single symbol (which should be a label or an external).
+ bool ParseDirectiveSymbolAttribute(MCSymbolAttr Attr);
+ bool ParseDirectiveELFType(); // ELF specific ".type"
+
+ bool ParseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm"
+
+ bool ParseDirectiveAbort(); // ".abort"
+ bool ParseDirectiveInclude(); // ".include"
+
+ bool ParseDirectiveIf(SMLoc DirectiveLoc); // ".if"
+ bool ParseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif"
+ bool ParseDirectiveElse(SMLoc DirectiveLoc); // ".else"
+ bool ParseDirectiveEndIf(SMLoc DirectiveLoc); // .endif
+
+ /// ParseEscapedString - Parse the current token as a string which may include
+ /// escaped characters and return the string contents.
+ bool ParseEscapedString(std::string &Data);
+};
+
+/// \brief Generic implementations of directive handling, etc. which is shared
+/// (or the default, at least) for all assembler parser.
+class GenericAsmParser : public MCAsmParserExtension {
+ template<bool (GenericAsmParser::*Handler)(StringRef, SMLoc)>
+ void AddDirectiveHandler(StringRef Directive) {
+ getParser().AddDirectiveHandler(this, Directive,
+ HandleDirective<GenericAsmParser, Handler>);
+ }
+
+public:
+ GenericAsmParser() {}
+
+ AsmParser &getParser() {
+ return (AsmParser&) this->MCAsmParserExtension::getParser();
+ }
+
+ virtual void Initialize(MCAsmParser &Parser) {
+ // Call the base implementation.
+ this->MCAsmParserExtension::Initialize(Parser);
+
+ // Debugging directives.
+ AddDirectiveHandler<&GenericAsmParser::ParseDirectiveFile>(".file");
+ AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLine>(".line");
+ AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLoc>(".loc");
+
+ // Macro directives.
+ AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacrosOnOff>(
+ ".macros_on");
+ AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacrosOnOff>(
+ ".macros_off");
+ AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacro>(".macro");
+ AddDirectiveHandler<&GenericAsmParser::ParseDirectiveEndMacro>(".endm");
+ AddDirectiveHandler<&GenericAsmParser::ParseDirectiveEndMacro>(".endmacro");
+ }
+
+ bool ParseDirectiveFile(StringRef, SMLoc DirectiveLoc);
+ bool ParseDirectiveLine(StringRef, SMLoc DirectiveLoc);
+ bool ParseDirectiveLoc(StringRef, SMLoc DirectiveLoc);
+
+ bool ParseDirectiveMacrosOnOff(StringRef, SMLoc DirectiveLoc);
+ bool ParseDirectiveMacro(StringRef, SMLoc DirectiveLoc);
+ bool ParseDirectiveEndMacro(StringRef, SMLoc DirectiveLoc);
+};
+
+}
+
+namespace llvm {
+
+extern MCAsmParserExtension *createDarwinAsmParser();
+extern MCAsmParserExtension *createELFAsmParser();
+
+}
+
+enum { DEFAULT_ADDRSPACE = 0 };
+
+AsmParser::AsmParser(const Target &T, SourceMgr &_SM, MCContext &_Ctx,
+ MCStreamer &_Out, const MCAsmInfo &_MAI)
+ : Lexer(_MAI), Ctx(_Ctx), Out(_Out), SrcMgr(_SM),
+ GenericParser(new GenericAsmParser), PlatformParser(0),
+ CurBuffer(0), MacrosEnabled(true) {
+ Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
+
+ // Initialize the generic parser.
+ GenericParser->Initialize(*this);
+
+ // Initialize the platform / file format parser.
+ //
+ // FIXME: This is a hack, we need to (majorly) cleanup how these objects are
+ // created.
+ if (_MAI.hasSubsectionsViaSymbols()) {
+ PlatformParser = createDarwinAsmParser();
+ PlatformParser->Initialize(*this);
+ } else {
+ PlatformParser = createELFAsmParser();
+ PlatformParser->Initialize(*this);
+ }
+}
+
+AsmParser::~AsmParser() {
+ assert(ActiveMacros.empty() && "Unexpected active macro instantiation!");
+
+ // Destroy any macros.
+ for (StringMap<Macro*>::iterator it = MacroMap.begin(),
+ ie = MacroMap.end(); it != ie; ++it)
+ delete it->getValue();
+
+ delete PlatformParser;
+ delete GenericParser;
+}
+
+void AsmParser::PrintMacroInstantiations() {
+ // Print the active macro instantiation stack.
+ for (std::vector<MacroInstantiation*>::const_reverse_iterator
+ it = ActiveMacros.rbegin(), ie = ActiveMacros.rend(); it != ie; ++it)
+ PrintMessage((*it)->InstantiationLoc, "while in macro instantiation",
+ "note");
+}
+
+void AsmParser::Warning(SMLoc L, const Twine &Msg) {
+ PrintMessage(L, Msg.str(), "warning");
+ PrintMacroInstantiations();
+}
+
+bool AsmParser::Error(SMLoc L, const Twine &Msg) {
+ PrintMessage(L, Msg.str(), "error");
+ PrintMacroInstantiations();
+ return true;
+}
+
+void AsmParser::PrintMessage(SMLoc Loc, const std::string &Msg,
+ const char *Type) const {
+ SrcMgr.PrintMessage(Loc, Msg, Type);
+}
+
+bool AsmParser::EnterIncludeFile(const std::string &Filename) {
+ int NewBuf = SrcMgr.AddIncludeFile(Filename, Lexer.getLoc());
+ if (NewBuf == -1)
+ return true;
+
+ CurBuffer = NewBuf;
+
+ Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
+
+ return false;
+}
+
+void AsmParser::JumpToLoc(SMLoc Loc) {
+ CurBuffer = SrcMgr.FindBufferContainingLoc(Loc);
+ Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer), Loc.getPointer());
+}
+
+const AsmToken &AsmParser::Lex() {
+ const AsmToken *tok = &Lexer.Lex();
+
+ if (tok->is(AsmToken::Eof)) {
+ // If this is the end of an included file, pop the parent file off the
+ // include stack.
+ SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
+ if (ParentIncludeLoc != SMLoc()) {
+ JumpToLoc(ParentIncludeLoc);
+ tok = &Lexer.Lex();
+ }
+ }
+
+ if (tok->is(AsmToken::Error))
+ Error(Lexer.getErrLoc(), Lexer.getErr());
+
+ return *tok;
+}
+
+bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
+ // Create the initial section, if requested.
+ //
+ // FIXME: Target hook & command line option for initial section.
+ if (!NoInitialTextSection)
+ Out.SwitchSection(Ctx.getMachOSection("__TEXT", "__text",
+ MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
+ 0, SectionKind::getText()));
+
+ // Prime the lexer.
+ Lex();
+
+ bool HadError = false;
+
+ AsmCond StartingCondState = TheCondState;
+
+ // While we have input, parse each statement.
+ while (Lexer.isNot(AsmToken::Eof)) {
+ if (!ParseStatement()) continue;
+
+ // We had an error, remember it and recover by skipping to the next line.
+ HadError = true;
+ EatToEndOfStatement();
+ }
+
+ if (TheCondState.TheCond != StartingCondState.TheCond ||
+ TheCondState.Ignore != StartingCondState.Ignore)
+ return TokError("unmatched .ifs or .elses");
+
+ // Check to see there are no empty DwarfFile slots.
+ const std::vector<MCDwarfFile *> &MCDwarfFiles =
+ getContext().getMCDwarfFiles();
+ for (unsigned i = 1; i < MCDwarfFiles.size(); i++) {
+ if (!MCDwarfFiles[i]){
+ TokError("unassigned file number: " + Twine(i) + " for .file directives");
+ HadError = true;
+ }
+ }
+
+ // Finalize the output stream if there are no errors and if the client wants
+ // us to.
+ if (!HadError && !NoFinalize)
+ Out.Finish();
+
+ return HadError;
+}
+
+/// EatToEndOfStatement - Throw away the rest of the line for testing purposes.
+void AsmParser::EatToEndOfStatement() {
+ while (Lexer.isNot(AsmToken::EndOfStatement) &&
+ Lexer.isNot(AsmToken::Eof))
+ Lex();
+
+ // Eat EOL.
+ if (Lexer.is(AsmToken::EndOfStatement))
+ Lex();
+}
+
+StringRef AsmParser::ParseStringToEndOfStatement() {
+ const char *Start = getTok().getLoc().getPointer();
+
+ while (Lexer.isNot(AsmToken::EndOfStatement) &&
+ Lexer.isNot(AsmToken::Eof))
+ Lex();
+
+ const char *End = getTok().getLoc().getPointer();
+ return StringRef(Start, End - Start);
+}
+
+/// ParseParenExpr - Parse a paren expression and return it.
+/// NOTE: This assumes the leading '(' has already been consumed.
+///
+/// parenexpr ::= expr)
+///
+bool AsmParser::ParseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) {
+ if (ParseExpression(Res)) return true;
+ if (Lexer.isNot(AsmToken::RParen))
+ return TokError("expected ')' in parentheses expression");
+ EndLoc = Lexer.getLoc();
+ Lex();
+ return false;
+}
+
+/// ParsePrimaryExpr - Parse a primary expression and return it.
+/// primaryexpr ::= (parenexpr
+/// primaryexpr ::= symbol
+/// primaryexpr ::= number
+/// primaryexpr ::= '.'
+/// primaryexpr ::= ~,+,- primaryexpr
+bool AsmParser::ParsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) {
+ switch (Lexer.getKind()) {
+ default:
+ return TokError("unknown token in expression");
+ case AsmToken::Exclaim:
+ Lex(); // Eat the operator.
+ if (ParsePrimaryExpr(Res, EndLoc))
+ return true;
+ Res = MCUnaryExpr::CreateLNot(Res, getContext());
+ return false;
+ case AsmToken::Dollar:
+ case AsmToken::String:
+ case AsmToken::Identifier: {
+ EndLoc = Lexer.getLoc();
+
+ StringRef Identifier;
+ if (ParseIdentifier(Identifier))
+ return false;
+
+ // This is a symbol reference.
+ std::pair<StringRef, StringRef> Split = Identifier.split('@');
+ MCSymbol *Sym = getContext().GetOrCreateSymbol(Split.first);
+
+ // Mark the symbol as used in an expression.
+ Sym->setUsedInExpr(true);
+
+ // Lookup the symbol variant if used.
+ MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
+ if (Split.first.size() != Identifier.size())
+ Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
+
+ // If this is an absolute variable reference, substitute it now to preserve
+ // semantics in the face of reassignment.
+ if (Sym->isVariable() && isa<MCConstantExpr>(Sym->getVariableValue())) {
+ if (Variant)
+ return Error(EndLoc, "unexpected modified on variable reference");
+
+ Res = Sym->getVariableValue();
+ return false;
+ }
+
+ // Otherwise create a symbol ref.
+ Res = MCSymbolRefExpr::Create(Sym, Variant, getContext());
+ return false;
+ }
+ case AsmToken::Integer: {
+ SMLoc Loc = getTok().getLoc();
+ int64_t IntVal = getTok().getIntVal();
+ Res = MCConstantExpr::Create(IntVal, getContext());
+ EndLoc = Lexer.getLoc();
+ Lex(); // Eat token.
+ // Look for 'b' or 'f' following an Integer as a directional label
+ if (Lexer.getKind() == AsmToken::Identifier) {
+ StringRef IDVal = getTok().getString();
+ if (IDVal == "f" || IDVal == "b"){
+ MCSymbol *Sym = Ctx.GetDirectionalLocalSymbol(IntVal,
+ IDVal == "f" ? 1 : 0);
+ Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None,
+ getContext());
+ if(IDVal == "b" && Sym->isUndefined())
+ return Error(Loc, "invalid reference to undefined symbol");
+ EndLoc = Lexer.getLoc();
+ Lex(); // Eat identifier.
+ }
+ }
+ return false;
+ }
+ case AsmToken::Dot: {
+ // This is a '.' reference, which references the current PC. Emit a
+ // temporary label to the streamer and refer to it.
+ MCSymbol *Sym = Ctx.CreateTempSymbol();
+ Out.EmitLabel(Sym);
+ Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None, getContext());
+ EndLoc = Lexer.getLoc();
+ Lex(); // Eat identifier.
+ return false;
+ }
+
+ case AsmToken::LParen:
+ Lex(); // Eat the '('.
+ return ParseParenExpr(Res, EndLoc);
+ case AsmToken::Minus:
+ Lex(); // Eat the operator.
+ if (ParsePrimaryExpr(Res, EndLoc))
+ return true;
+ Res = MCUnaryExpr::CreateMinus(Res, getContext());
+ return false;
+ case AsmToken::Plus:
+ Lex(); // Eat the operator.
+ if (ParsePrimaryExpr(Res, EndLoc))
+ return true;
+ Res = MCUnaryExpr::CreatePlus(Res, getContext());
+ return false;
+ case AsmToken::Tilde:
+ Lex(); // Eat the operator.
+ if (ParsePrimaryExpr(Res, EndLoc))
+ return true;
+ Res = MCUnaryExpr::CreateNot(Res, getContext());
+ return false;
+ }
+}
+
+bool AsmParser::ParseExpression(const MCExpr *&Res) {
+ SMLoc EndLoc;
+ return ParseExpression(Res, EndLoc);
+}
+
+/// ParseExpression - Parse an expression and return it.
+///
+/// expr ::= expr +,- expr -> lowest.
+/// expr ::= expr |,^,&,! expr -> middle.
+/// expr ::= expr *,/,%,<<,>> expr -> highest.
+/// expr ::= primaryexpr
+///
+bool AsmParser::ParseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
+ // Parse the expression.
+ Res = 0;
+ if (ParsePrimaryExpr(Res, EndLoc) || ParseBinOpRHS(1, Res, EndLoc))
+ return true;
+
+ // Try to constant fold it up front, if possible.
+ int64_t Value;
+ if (Res->EvaluateAsAbsolute(Value))
+ Res = MCConstantExpr::Create(Value, getContext());
+
+ return false;
+}
+
+bool AsmParser::ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
+ Res = 0;
+ return ParseParenExpr(Res, EndLoc) ||
+ ParseBinOpRHS(1, Res, EndLoc);
+}
+
+bool AsmParser::ParseAbsoluteExpression(int64_t &Res) {
+ const MCExpr *Expr;
+
+ SMLoc StartLoc = Lexer.getLoc();
+ if (ParseExpression(Expr))
+ return true;
+
+ if (!Expr->EvaluateAsAbsolute(Res))
+ return Error(StartLoc, "expected absolute expression");
+
+ return false;
+}
+
+static unsigned getBinOpPrecedence(AsmToken::TokenKind K,
+ MCBinaryExpr::Opcode &Kind) {
+ switch (K) {
+ default:
+ return 0; // not a binop.
+
+ // Lowest Precedence: &&, ||
+ case AsmToken::AmpAmp:
+ Kind = MCBinaryExpr::LAnd;
+ return 1;
+ case AsmToken::PipePipe:
+ Kind = MCBinaryExpr::LOr;
+ return 1;
+
+ // Low Precedence: +, -, ==, !=, <>, <, <=, >, >=
+ case AsmToken::Plus:
+ Kind = MCBinaryExpr::Add;
+ return 2;
+ case AsmToken::Minus:
+ Kind = MCBinaryExpr::Sub;
+ return 2;
+ case AsmToken::EqualEqual:
+ Kind = MCBinaryExpr::EQ;
+ return 2;
+ case AsmToken::ExclaimEqual:
+ case AsmToken::LessGreater:
+ Kind = MCBinaryExpr::NE;
+ return 2;
+ case AsmToken::Less:
+ Kind = MCBinaryExpr::LT;
+ return 2;
+ case AsmToken::LessEqual:
+ Kind = MCBinaryExpr::LTE;
+ return 2;
+ case AsmToken::Greater:
+ Kind = MCBinaryExpr::GT;
+ return 2;
+ case AsmToken::GreaterEqual:
+ Kind = MCBinaryExpr::GTE;
+ return 2;
+
+ // Intermediate Precedence: |, &, ^
+ //
+ // FIXME: gas seems to support '!' as an infix operator?
+ case AsmToken::Pipe:
+ Kind = MCBinaryExpr::Or;
+ return 3;
+ case AsmToken::Caret:
+ Kind = MCBinaryExpr::Xor;
+ return 3;
+ case AsmToken::Amp:
+ Kind = MCBinaryExpr::And;
+ return 3;
+
+ // Highest Precedence: *, /, %, <<, >>
+ case AsmToken::Star:
+ Kind = MCBinaryExpr::Mul;
+ return 4;
+ case AsmToken::Slash:
+ Kind = MCBinaryExpr::Div;
+ return 4;
+ case AsmToken::Percent:
+ Kind = MCBinaryExpr::Mod;
+ return 4;
+ case AsmToken::LessLess:
+ Kind = MCBinaryExpr::Shl;
+ return 4;
+ case AsmToken::GreaterGreater:
+ Kind = MCBinaryExpr::Shr;
+ return 4;
+ }
+}
+
+
+/// ParseBinOpRHS - Parse all binary operators with precedence >= 'Precedence'.
+/// Res contains the LHS of the expression on input.
+bool AsmParser::ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
+ SMLoc &EndLoc) {
+ while (1) {
+ MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
+ unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
+
+ // If the next token is lower precedence than we are allowed to eat, return
+ // successfully with what we ate already.
+ if (TokPrec < Precedence)
+ return false;
+
+ Lex();
+
+ // Eat the next primary expression.
+ const MCExpr *RHS;
+ if (ParsePrimaryExpr(RHS, EndLoc)) return true;
+
+ // If BinOp binds less tightly with RHS than the operator after RHS, let
+ // the pending operator take RHS as its LHS.
+ MCBinaryExpr::Opcode Dummy;
+ unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
+ if (TokPrec < NextTokPrec) {
+ if (ParseBinOpRHS(Precedence+1, RHS, EndLoc)) return true;
+ }
+
+ // Merge LHS and RHS according to operator.
+ Res = MCBinaryExpr::Create(Kind, Res, RHS, getContext());
+ }
+}
+
+
+
+
+/// ParseStatement:
+/// ::= EndOfStatement
+/// ::= Label* Directive ...Operands... EndOfStatement
+/// ::= Label* Identifier OperandList* EndOfStatement
+bool AsmParser::ParseStatement() {
+ if (Lexer.is(AsmToken::EndOfStatement)) {
+ Out.AddBlankLine();
+ Lex();
+ return false;
+ }
+
+ // Statements always start with an identifier.
+ AsmToken ID = getTok();
+ SMLoc IDLoc = ID.getLoc();
+ StringRef IDVal;
+ int64_t LocalLabelVal = -1;
+ // GUESS allow an integer followed by a ':' as a directional local label
+ if (Lexer.is(AsmToken::Integer)) {
+ LocalLabelVal = getTok().getIntVal();
+ if (LocalLabelVal < 0) {
+ if (!TheCondState.Ignore)
+ return TokError("unexpected token at start of statement");
+ IDVal = "";
+ }
+ else {
+ IDVal = getTok().getString();
+ Lex(); // Consume the integer token to be used as an identifier token.
+ if (Lexer.getKind() != AsmToken::Colon) {
+ if (!TheCondState.Ignore)
+ return TokError("unexpected token at start of statement");
+ }
+ }
+ }
+ else if (ParseIdentifier(IDVal)) {
+ if (!TheCondState.Ignore)
+ return TokError("unexpected token at start of statement");
+ IDVal = "";
+ }
+
+ // Handle conditional assembly here before checking for skipping. We
+ // have to do this so that .endif isn't skipped in a ".if 0" block for
+ // example.
+ if (IDVal == ".if")
+ return ParseDirectiveIf(IDLoc);
+ if (IDVal == ".elseif")
+ return ParseDirectiveElseIf(IDLoc);
+ if (IDVal == ".else")
+ return ParseDirectiveElse(IDLoc);
+ if (IDVal == ".endif")
+ return ParseDirectiveEndIf(IDLoc);
+
+ // If we are in a ".if 0" block, ignore this statement.
+ if (TheCondState.Ignore) {
+ EatToEndOfStatement();
+ return false;
+ }
+
+ // FIXME: Recurse on local labels?
+
+ // See what kind of statement we have.
+ switch (Lexer.getKind()) {
+ case AsmToken::Colon: {
+ // identifier ':' -> Label.
+ Lex();
+
+ // Diagnose attempt to use a variable as a label.
+ //
+ // FIXME: Diagnostics. Note the location of the definition as a label.
+ // FIXME: This doesn't diagnose assignment to a symbol which has been
+ // implicitly marked as external.
+ MCSymbol *Sym;
+ if (LocalLabelVal == -1)
+ Sym = getContext().GetOrCreateSymbol(IDVal);
+ else
+ Sym = Ctx.CreateDirectionalLocalSymbol(LocalLabelVal);
+ if (!Sym->isUndefined() || Sym->isVariable())
+ return Error(IDLoc, "invalid symbol redefinition");
+
+ // Emit the label.
+ Out.EmitLabel(Sym);
+
+ // Consume any end of statement token, if present, to avoid spurious
+ // AddBlankLine calls().
+ if (Lexer.is(AsmToken::EndOfStatement)) {
+ Lex();
+ if (Lexer.is(AsmToken::Eof))
+ return false;
+ }
+
+ return ParseStatement();
+ }
+
+ case AsmToken::Equal:
+ // identifier '=' ... -> assignment statement
+ Lex();
+
+ return ParseAssignment(IDVal);
+
+ default: // Normal instruction or directive.
+ break;
+ }
+
+ // If macros are enabled, check to see if this is a macro instantiation.
+ if (MacrosEnabled)
+ if (const Macro *M = MacroMap.lookup(IDVal))
+ return HandleMacroEntry(IDVal, IDLoc, M);
+
+ // Otherwise, we have a normal instruction or directive.
+ if (IDVal[0] == '.') {
+ // Assembler features
+ if (IDVal == ".set")
+ return ParseDirectiveSet();
+
+ // Data directives
+
+ if (IDVal == ".ascii")
+ return ParseDirectiveAscii(false);
+ if (IDVal == ".asciz")
+ return ParseDirectiveAscii(true);
+
+ if (IDVal == ".byte")
+ return ParseDirectiveValue(1);
+ if (IDVal == ".short")
+ return ParseDirectiveValue(2);
+ if (IDVal == ".long")
+ return ParseDirectiveValue(4);
+ if (IDVal == ".quad")
+ return ParseDirectiveValue(8);
+
+ if (IDVal == ".align") {
+ bool IsPow2 = !getContext().getAsmInfo().getAlignmentIsInBytes();
+ return ParseDirectiveAlign(IsPow2, /*ExprSize=*/1);
+ }
+ if (IDVal == ".align32") {
+ bool IsPow2 = !getContext().getAsmInfo().getAlignmentIsInBytes();
+ return ParseDirectiveAlign(IsPow2, /*ExprSize=*/4);
+ }
+ if (IDVal == ".balign")
+ return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
+ if (IDVal == ".balignw")
+ return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
+ if (IDVal == ".balignl")
+ return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
+ if (IDVal == ".p2align")
+ return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
+ if (IDVal == ".p2alignw")
+ return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
+ if (IDVal == ".p2alignl")
+ return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
+
+ if (IDVal == ".org")
+ return ParseDirectiveOrg();
+
+ if (IDVal == ".fill")
+ return ParseDirectiveFill();
+ if (IDVal == ".space")
+ return ParseDirectiveSpace();
+
+ // Symbol attribute directives
+
+ if (IDVal == ".globl" || IDVal == ".global")
+ return ParseDirectiveSymbolAttribute(MCSA_Global);
+ if (IDVal == ".hidden")
+ return ParseDirectiveSymbolAttribute(MCSA_Hidden);
+ if (IDVal == ".indirect_symbol")
+ return ParseDirectiveSymbolAttribute(MCSA_IndirectSymbol);
+ if (IDVal == ".internal")
+ return ParseDirectiveSymbolAttribute(MCSA_Internal);
+ if (IDVal == ".lazy_reference")
+ return ParseDirectiveSymbolAttribute(MCSA_LazyReference);
+ if (IDVal == ".no_dead_strip")
+ return ParseDirectiveSymbolAttribute(MCSA_NoDeadStrip);
+ if (IDVal == ".private_extern")
+ return ParseDirectiveSymbolAttribute(MCSA_PrivateExtern);
+ if (IDVal == ".protected")
+ return ParseDirectiveSymbolAttribute(MCSA_Protected);
+ if (IDVal == ".reference")
+ return ParseDirectiveSymbolAttribute(MCSA_Reference);
+ if (IDVal == ".type")
+ return ParseDirectiveELFType();
+ if (IDVal == ".weak")
+ return ParseDirectiveSymbolAttribute(MCSA_Weak);
+ if (IDVal == ".weak_definition")
+ return ParseDirectiveSymbolAttribute(MCSA_WeakDefinition);
+ if (IDVal == ".weak_reference")
+ return ParseDirectiveSymbolAttribute(MCSA_WeakReference);
+ if (IDVal == ".weak_def_can_be_hidden")
+ return ParseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate);
+
+ if (IDVal == ".comm")
+ return ParseDirectiveComm(/*IsLocal=*/false);
+ if (IDVal == ".lcomm")
+ return ParseDirectiveComm(/*IsLocal=*/true);
+
+ if (IDVal == ".abort")
+ return ParseDirectiveAbort();
+ if (IDVal == ".include")
+ return ParseDirectiveInclude();
+
+ // Look up the handler in the handler table.
+ std::pair<MCAsmParserExtension*, DirectiveHandler> Handler =
+ DirectiveMap.lookup(IDVal);
+ if (Handler.first)
+ return (*Handler.second)(Handler.first, IDVal, IDLoc);
+
+ // Target hook for parsing target specific directives.
+ if (!getTargetParser().ParseDirective(ID))
+ return false;
+
+ Warning(IDLoc, "ignoring directive for now");
+ EatToEndOfStatement();
+ return false;
+ }
+
+ // Canonicalize the opcode to lower case.
+ SmallString<128> Opcode;
+ for (unsigned i = 0, e = IDVal.size(); i != e; ++i)
+ Opcode.push_back(tolower(IDVal[i]));
+
+ SmallVector<MCParsedAsmOperand*, 8> ParsedOperands;
+ bool HadError = getTargetParser().ParseInstruction(Opcode.str(), IDLoc,
+ ParsedOperands);
+ if (!HadError && Lexer.isNot(AsmToken::EndOfStatement))
+ HadError = TokError("unexpected token in argument list");
+
+ // Dump the parsed representation, if requested.
+ if (getShowParsedOperands()) {
+ SmallString<256> Str;
+ raw_svector_ostream OS(Str);
+ OS << "parsed instruction: [";
+ for (unsigned i = 0; i != ParsedOperands.size(); ++i) {
+ if (i != 0)
+ OS << ", ";
+ ParsedOperands[i]->dump(OS);
+ }
+ OS << "]";
+
+ PrintMessage(IDLoc, OS.str(), "note");
+ }
+
+ // If parsing succeeded, match the instruction.
+ if (!HadError) {
+ MCInst Inst;
+ if (!getTargetParser().MatchInstruction(IDLoc, ParsedOperands, Inst)) {
+ // Emit the instruction on success.
+ Out.EmitInstruction(Inst);
+ } else
+ HadError = true;
+ }
+
+ // If there was no error, consume the end-of-statement token. Otherwise this
+ // will be done by our caller.
+ if (!HadError)
+ Lex();
+
+ // Free any parsed operands.
+ for (unsigned i = 0, e = ParsedOperands.size(); i != e; ++i)
+ delete ParsedOperands[i];
+
+ return HadError;
+}
+
+MacroInstantiation::MacroInstantiation(const Macro *M, SMLoc IL, SMLoc EL,
+ const std::vector<std::vector<AsmToken> > &A)
+ : TheMacro(M), InstantiationLoc(IL), ExitLoc(EL)
+{
+ // Macro instantiation is lexical, unfortunately. We construct a new buffer
+ // to hold the macro body with substitutions.
+ SmallString<256> Buf;
+ raw_svector_ostream OS(Buf);
+
+ StringRef Body = M->Body;
+ while (!Body.empty()) {
+ // Scan for the next substitution.
+ std::size_t End = Body.size(), Pos = 0;
+ for (; Pos != End; ++Pos) {
+ // Check for a substitution or escape.
+ if (Body[Pos] != '$' || Pos + 1 == End)
+ continue;
+
+ char Next = Body[Pos + 1];
+ if (Next == '$' || Next == 'n' || isdigit(Next))
+ break;
+ }
+
+ // Add the prefix.
+ OS << Body.slice(0, Pos);
+
+ // Check if we reached the end.
+ if (Pos == End)
+ break;
+
+ switch (Body[Pos+1]) {
+ // $$ => $
+ case '$':
+ OS << '$';
+ break;
+
+ // $n => number of arguments
+ case 'n':
+ OS << A.size();
+ break;
+
+ // $[0-9] => argument
+ default: {
+ // Missing arguments are ignored.
+ unsigned Index = Body[Pos+1] - '0';
+ if (Index >= A.size())
+ break;
+
+ // Otherwise substitute with the token values, with spaces eliminated.
+ for (std::vector<AsmToken>::const_iterator it = A[Index].begin(),
+ ie = A[Index].end(); it != ie; ++it)
+ OS << it->getString();
+ break;
+ }
+ }
+
+ // Update the scan point.
+ Body = Body.substr(Pos + 2);
+ }
+
+ // We include the .endmacro in the buffer as our queue to exit the macro
+ // instantiation.
+ OS << ".endmacro\n";
+
+ Instantiation = MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
+}
+
+bool AsmParser::HandleMacroEntry(StringRef Name, SMLoc NameLoc,
+ const Macro *M) {
+ // Arbitrarily limit macro nesting depth, to match 'as'. We can eliminate
+ // this, although we should protect against infinite loops.
+ if (ActiveMacros.size() == 20)
+ return TokError("macros cannot be nested more than 20 levels deep");
+
+ // Parse the macro instantiation arguments.
+ std::vector<std::vector<AsmToken> > MacroArguments;
+ MacroArguments.push_back(std::vector<AsmToken>());
+ unsigned ParenLevel = 0;
+ for (;;) {
+ if (Lexer.is(AsmToken::Eof))
+ return TokError("unexpected token in macro instantiation");
+ if (Lexer.is(AsmToken::EndOfStatement))
+ break;
+
+ // If we aren't inside parentheses and this is a comma, start a new token
+ // list.
+ if (ParenLevel == 0 && Lexer.is(AsmToken::Comma)) {
+ MacroArguments.push_back(std::vector<AsmToken>());
+ } else {
+ // Adjust the current parentheses level.
+ if (Lexer.is(AsmToken::LParen))
+ ++ParenLevel;
+ else if (Lexer.is(AsmToken::RParen) && ParenLevel)
+ --ParenLevel;
+
+ // Append the token to the current argument list.
+ MacroArguments.back().push_back(getTok());
+ }
+ Lex();
+ }
+
+ // Create the macro instantiation object and add to the current macro
+ // instantiation stack.
+ MacroInstantiation *MI = new MacroInstantiation(M, NameLoc,
+ getTok().getLoc(),
+ MacroArguments);
+ ActiveMacros.push_back(MI);
+
+ // Jump to the macro instantiation and prime the lexer.
+ CurBuffer = SrcMgr.AddNewSourceBuffer(MI->Instantiation, SMLoc());
+ Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
+ Lex();
+
+ return false;
+}
+
+void AsmParser::HandleMacroExit() {
+ // Jump to the EndOfStatement we should return to, and consume it.
+ JumpToLoc(ActiveMacros.back()->ExitLoc);
+ Lex();
+
+ // Pop the instantiation entry.
+ delete ActiveMacros.back();
+ ActiveMacros.pop_back();
+}
+
+bool AsmParser::ParseAssignment(StringRef Name) {
+ // FIXME: Use better location, we should use proper tokens.
+ SMLoc EqualLoc = Lexer.getLoc();
+
+ const MCExpr *Value;
+ if (ParseExpression(Value))
+ return true;
+
+ if (Lexer.isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in assignment");
+
+ // Eat the end of statement marker.
+ Lex();
+
+ // Validate that the LHS is allowed to be a variable (either it has not been
+ // used as a symbol, or it is an absolute symbol).
+ MCSymbol *Sym = getContext().LookupSymbol(Name);
+ if (Sym) {
+ // Diagnose assignment to a label.
+ //
+ // FIXME: Diagnostics. Note the location of the definition as a label.
+ // FIXME: Diagnose assignment to protected identifier (e.g., register name).
+ if (Sym->isUndefined() && !Sym->isUsedInExpr())
+ ; // Allow redefinitions of undefined symbols only used in directives.
+ else if (!Sym->isUndefined() && !Sym->isAbsolute())
+ return Error(EqualLoc, "redefinition of '" + Name + "'");
+ else if (!Sym->isVariable())
+ return Error(EqualLoc, "invalid assignment to '" + Name + "'");
+ else if (!isa<MCConstantExpr>(Sym->getVariableValue()))
+ return Error(EqualLoc, "invalid reassignment of non-absolute variable '" +
+ Name + "'");
+ } else
+ Sym = getContext().GetOrCreateSymbol(Name);
+
+ // FIXME: Handle '.'.
+
+ Sym->setUsedInExpr(true);
+
+ // Do the assignment.
+ Out.EmitAssignment(Sym, Value);
+
+ return false;
+}
+
+/// ParseIdentifier:
+/// ::= identifier
+/// ::= string
+bool AsmParser::ParseIdentifier(StringRef &Res) {
+ // The assembler has relaxed rules for accepting identifiers, in particular we
+ // allow things like '.globl $foo', which would normally be separate
+ // tokens. At this level, we have already lexed so we cannot (currently)
+ // handle this as a context dependent token, instead we detect adjacent tokens
+ // and return the combined identifier.
+ if (Lexer.is(AsmToken::Dollar)) {
+ SMLoc DollarLoc = getLexer().getLoc();
+
+ // Consume the dollar sign, and check for a following identifier.
+ Lex();
+ if (Lexer.isNot(AsmToken::Identifier))
+ return true;
+
+ // We have a '$' followed by an identifier, make sure they are adjacent.
+ if (DollarLoc.getPointer() + 1 != getTok().getLoc().getPointer())
+ return true;
+
+ // Construct the joined identifier and consume the token.
+ Res = StringRef(DollarLoc.getPointer(),
+ getTok().getIdentifier().size() + 1);
+ Lex();
+ return false;
+ }
+
+ if (Lexer.isNot(AsmToken::Identifier) &&
+ Lexer.isNot(AsmToken::String))
+ return true;
+
+ Res = getTok().getIdentifier();
+
+ Lex(); // Consume the identifier token.
+
+ return false;
+}
+
+/// ParseDirectiveSet:
+/// ::= .set identifier ',' expression
+bool AsmParser::ParseDirectiveSet() {
+ StringRef Name;
+
+ if (ParseIdentifier(Name))
+ return TokError("expected identifier after '.set' directive");
+
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("unexpected token in '.set'");
+ Lex();
+
+ return ParseAssignment(Name);
+}
+
+bool AsmParser::ParseEscapedString(std::string &Data) {
+ assert(getLexer().is(AsmToken::String) && "Unexpected current token!");
+
+ Data = "";
+ StringRef Str = getTok().getStringContents();
+ for (unsigned i = 0, e = Str.size(); i != e; ++i) {
+ if (Str[i] != '\\') {
+ Data += Str[i];
+ continue;
+ }
+
+ // Recognize escaped characters. Note that this escape semantics currently
+ // loosely follows Darwin 'as'. Notably, it doesn't support hex escapes.
+ ++i;
+ if (i == e)
+ return TokError("unexpected backslash at end of string");
+
+ // Recognize octal sequences.
+ if ((unsigned) (Str[i] - '0') <= 7) {
+ // Consume up to three octal characters.
+ unsigned Value = Str[i] - '0';
+
+ if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) {
+ ++i;
+ Value = Value * 8 + (Str[i] - '0');
+
+ if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) {
+ ++i;
+ Value = Value * 8 + (Str[i] - '0');
+ }
+ }
+
+ if (Value > 255)
+ return TokError("invalid octal escape sequence (out of range)");
+
+ Data += (unsigned char) Value;
+ continue;
+ }
+
+ // Otherwise recognize individual escapes.
+ switch (Str[i]) {
+ default:
+ // Just reject invalid escape sequences for now.
+ return TokError("invalid escape sequence (unrecognized character)");
+
+ case 'b': Data += '\b'; break;
+ case 'f': Data += '\f'; break;
+ case 'n': Data += '\n'; break;
+ case 'r': Data += '\r'; break;
+ case 't': Data += '\t'; break;
+ case '"': Data += '"'; break;
+ case '\\': Data += '\\'; break;
+ }
+ }
+
+ return false;
+}
+
+/// ParseDirectiveAscii:
+/// ::= ( .ascii | .asciz ) [ "string" ( , "string" )* ]
+bool AsmParser::ParseDirectiveAscii(bool ZeroTerminated) {
+ if (getLexer().isNot(AsmToken::EndOfStatement)) {
+ for (;;) {
+ if (getLexer().isNot(AsmToken::String))
+ return TokError("expected string in '.ascii' or '.asciz' directive");
+
+ std::string Data;
+ if (ParseEscapedString(Data))
+ return true;
+
+ getStreamer().EmitBytes(Data, DEFAULT_ADDRSPACE);
+ if (ZeroTerminated)
+ getStreamer().EmitBytes(StringRef("\0", 1), DEFAULT_ADDRSPACE);
+
+ Lex();
+
+ if (getLexer().is(AsmToken::EndOfStatement))
+ break;
+
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("unexpected token in '.ascii' or '.asciz' directive");
+ Lex();
+ }
+ }
+
+ Lex();
+ return false;
+}
+
+/// ParseDirectiveValue
+/// ::= (.byte | .short | ... ) [ expression (, expression)* ]
+bool AsmParser::ParseDirectiveValue(unsigned Size) {
+ if (getLexer().isNot(AsmToken::EndOfStatement)) {
+ for (;;) {
+ const MCExpr *Value;
+ SMLoc ATTRIBUTE_UNUSED StartLoc = getLexer().getLoc();
+ if (ParseExpression(Value))
+ return true;
+
+ // Special case constant expressions to match code generator.
+ if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value))
+ getStreamer().EmitIntValue(MCE->getValue(), Size, DEFAULT_ADDRSPACE);
+ else
+ getStreamer().EmitValue(Value, Size, DEFAULT_ADDRSPACE);
+
+ if (getLexer().is(AsmToken::EndOfStatement))
+ break;
+
+ // FIXME: Improve diagnostic.
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("unexpected token in directive");
+ Lex();
+ }
+ }
+
+ Lex();
+ return false;
+}
+
+/// ParseDirectiveSpace
+/// ::= .space expression [ , expression ]
+bool AsmParser::ParseDirectiveSpace() {
+ int64_t NumBytes;
+ if (ParseAbsoluteExpression(NumBytes))
+ return true;
+
+ int64_t FillExpr = 0;
+ if (getLexer().isNot(AsmToken::EndOfStatement)) {
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("unexpected token in '.space' directive");
+ Lex();
+
+ if (ParseAbsoluteExpression(FillExpr))
+ return true;
+
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.space' directive");
+ }
+
+ Lex();
+
+ if (NumBytes <= 0)
+ return TokError("invalid number of bytes in '.space' directive");
+
+ // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
+ getStreamer().EmitFill(NumBytes, FillExpr, DEFAULT_ADDRSPACE);
+
+ return false;
+}
+
+/// ParseDirectiveFill
+/// ::= .fill expression , expression , expression
+bool AsmParser::ParseDirectiveFill() {
+ int64_t NumValues;
+ if (ParseAbsoluteExpression(NumValues))
+ return true;
+
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("unexpected token in '.fill' directive");
+ Lex();
+
+ int64_t FillSize;
+ if (ParseAbsoluteExpression(FillSize))
+ return true;
+
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("unexpected token in '.fill' directive");
+ Lex();
+
+ int64_t FillExpr;
+ if (ParseAbsoluteExpression(FillExpr))
+ return true;
+
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.fill' directive");
+
+ Lex();
+
+ if (FillSize != 1 && FillSize != 2 && FillSize != 4 && FillSize != 8)
+ return TokError("invalid '.fill' size, expected 1, 2, 4, or 8");
+
+ for (uint64_t i = 0, e = NumValues; i != e; ++i)
+ getStreamer().EmitIntValue(FillExpr, FillSize, DEFAULT_ADDRSPACE);
+
+ return false;
+}
+
+/// ParseDirectiveOrg
+/// ::= .org expression [ , expression ]
+bool AsmParser::ParseDirectiveOrg() {
+ const MCExpr *Offset;
+ if (ParseExpression(Offset))
+ return true;
+
+ // Parse optional fill expression.
+ int64_t FillExpr = 0;
+ if (getLexer().isNot(AsmToken::EndOfStatement)) {
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("unexpected token in '.org' directive");
+ Lex();
+
+ if (ParseAbsoluteExpression(FillExpr))
+ return true;
+
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.org' directive");
+ }
+
+ Lex();
+
+ // FIXME: Only limited forms of relocatable expressions are accepted here, it
+ // has to be relative to the current section.
+ getStreamer().EmitValueToOffset(Offset, FillExpr);
+
+ return false;
+}
+
+/// ParseDirectiveAlign
+/// ::= {.align, ...} expression [ , expression [ , expression ]]
+bool AsmParser::ParseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
+ SMLoc AlignmentLoc = getLexer().getLoc();
+ int64_t Alignment;
+ if (ParseAbsoluteExpression(Alignment))
+ return true;
+
+ SMLoc MaxBytesLoc;
+ bool HasFillExpr = false;
+ int64_t FillExpr = 0;
+ int64_t MaxBytesToFill = 0;
+ if (getLexer().isNot(AsmToken::EndOfStatement)) {
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("unexpected token in directive");
+ Lex();
+
+ // The fill expression can be omitted while specifying a maximum number of
+ // alignment bytes, e.g:
+ // .align 3,,4
+ if (getLexer().isNot(AsmToken::Comma)) {
+ HasFillExpr = true;
+ if (ParseAbsoluteExpression(FillExpr))
+ return true;
+ }
+
+ if (getLexer().isNot(AsmToken::EndOfStatement)) {
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("unexpected token in directive");
+ Lex();
+
+ MaxBytesLoc = getLexer().getLoc();
+ if (ParseAbsoluteExpression(MaxBytesToFill))
+ return true;
+
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in directive");
+ }
+ }
+
+ Lex();
+
+ if (!HasFillExpr)
+ FillExpr = 0;
+
+ // Compute alignment in bytes.
+ if (IsPow2) {
+ // FIXME: Diagnose overflow.
+ if (Alignment >= 32) {
+ Error(AlignmentLoc, "invalid alignment value");
+ Alignment = 31;
+ }
+
+ Alignment = 1ULL << Alignment;
+ }
+
+ // Diagnose non-sensical max bytes to align.
+ if (MaxBytesLoc.isValid()) {
+ if (MaxBytesToFill < 1) {
+ Error(MaxBytesLoc, "alignment directive can never be satisfied in this "
+ "many bytes, ignoring maximum bytes expression");
+ MaxBytesToFill = 0;
+ }
+
+ if (MaxBytesToFill >= Alignment) {
+ Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
+ "has no effect");
+ MaxBytesToFill = 0;
+ }
+ }
+
+ // Check whether we should use optimal code alignment for this .align
+ // directive.
+ //
+ // FIXME: This should be using a target hook.
+ bool UseCodeAlign = false;
+ if (const MCSectionMachO *S = dyn_cast<MCSectionMachO>(
+ getStreamer().getCurrentSection()))
+ UseCodeAlign = S->hasAttribute(MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS);
+ if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) &&
+ ValueSize == 1 && UseCodeAlign) {
+ getStreamer().EmitCodeAlignment(Alignment, MaxBytesToFill);
+ } else {
+ // FIXME: Target specific behavior about how the "extra" bytes are filled.
+ getStreamer().EmitValueToAlignment(Alignment, FillExpr, ValueSize,
+ MaxBytesToFill);
+ }
+
+ return false;
+}
+
+/// ParseDirectiveSymbolAttribute
+/// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
+bool AsmParser::ParseDirectiveSymbolAttribute(MCSymbolAttr Attr) {
+ if (getLexer().isNot(AsmToken::EndOfStatement)) {
+ for (;;) {
+ StringRef Name;
+
+ if (ParseIdentifier(Name))
+ return TokError("expected identifier in directive");
+
+ MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
+
+ getStreamer().EmitSymbolAttribute(Sym, Attr);
+
+ if (getLexer().is(AsmToken::EndOfStatement))
+ break;
+
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("unexpected token in directive");
+ Lex();
+ }
+ }
+
+ Lex();
+ return false;
+}
+
+/// ParseDirectiveELFType
+/// ::= .type identifier , @attribute
+bool AsmParser::ParseDirectiveELFType() {
+ StringRef Name;
+ if (ParseIdentifier(Name))
+ return TokError("expected identifier in directive");
+
+ // Handle the identifier as the key symbol.
+ MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
+
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("unexpected token in '.type' directive");
+ Lex();
+
+ if (getLexer().isNot(AsmToken::At))
+ return TokError("expected '@' before type");
+ Lex();
+
+ StringRef Type;
+ SMLoc TypeLoc;
+
+ TypeLoc = getLexer().getLoc();
+ if (ParseIdentifier(Type))
+ return TokError("expected symbol type in directive");
+
+ MCSymbolAttr Attr = StringSwitch<MCSymbolAttr>(Type)
+ .Case("function", MCSA_ELF_TypeFunction)
+ .Case("object", MCSA_ELF_TypeObject)
+ .Case("tls_object", MCSA_ELF_TypeTLS)
+ .Case("common", MCSA_ELF_TypeCommon)
+ .Case("notype", MCSA_ELF_TypeNoType)
+ .Default(MCSA_Invalid);
+
+ if (Attr == MCSA_Invalid)
+ return Error(TypeLoc, "unsupported attribute in '.type' directive");
+
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.type' directive");
+
+ Lex();
+
+ getStreamer().EmitSymbolAttribute(Sym, Attr);
+
+ return false;
+}
+
+/// ParseDirectiveComm
+/// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
+bool AsmParser::ParseDirectiveComm(bool IsLocal) {
+ SMLoc IDLoc = getLexer().getLoc();
+ StringRef Name;
+ if (ParseIdentifier(Name))
+ return TokError("expected identifier in directive");
+
+ // Handle the identifier as the key symbol.
+ MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
+
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("unexpected token in directive");
+ Lex();
+
+ int64_t Size;
+ SMLoc SizeLoc = getLexer().getLoc();
+ if (ParseAbsoluteExpression(Size))
+ return true;
+
+ int64_t Pow2Alignment = 0;
+ SMLoc Pow2AlignmentLoc;
+ if (getLexer().is(AsmToken::Comma)) {
+ Lex();
+ Pow2AlignmentLoc = getLexer().getLoc();
+ if (ParseAbsoluteExpression(Pow2Alignment))
+ return true;
+
+ // If this target takes alignments in bytes (not log) validate and convert.
+ if (Lexer.getMAI().getAlignmentIsInBytes()) {
+ if (!isPowerOf2_64(Pow2Alignment))
+ return Error(Pow2AlignmentLoc, "alignment must be a power of 2");
+ Pow2Alignment = Log2_64(Pow2Alignment);
+ }
+ }
+
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.comm' or '.lcomm' directive");
+
+ Lex();
+
+ // NOTE: a size of zero for a .comm should create a undefined symbol
+ // but a size of .lcomm creates a bss symbol of size zero.
+ if (Size < 0)
+ return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't "
+ "be less than zero");
+
+ // NOTE: The alignment in the directive is a power of 2 value, the assembler
+ // may internally end up wanting an alignment in bytes.
+ // FIXME: Diagnose overflow.
+ if (Pow2Alignment < 0)
+ return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive "
+ "alignment, can't be less than zero");
+
+ if (!Sym->isUndefined())
+ return Error(IDLoc, "invalid symbol redefinition");
+
+ // '.lcomm' is equivalent to '.zerofill'.
+ // Create the Symbol as a common or local common with Size and Pow2Alignment
+ if (IsLocal) {
+ getStreamer().EmitZerofill(Ctx.getMachOSection(
+ "__DATA", "__bss", MCSectionMachO::S_ZEROFILL,
+ 0, SectionKind::getBSS()),
+ Sym, Size, 1 << Pow2Alignment);
+ return false;
+ }
+
+ getStreamer().EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment);
+ return false;
+}
+
+/// ParseDirectiveAbort
+/// ::= .abort [... message ...]
+bool AsmParser::ParseDirectiveAbort() {
+ // FIXME: Use loc from directive.
+ SMLoc Loc = getLexer().getLoc();
+
+ StringRef Str = ParseStringToEndOfStatement();
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.abort' directive");
+
+ Lex();
+
+ if (Str.empty())
+ Error(Loc, ".abort detected. Assembly stopping.");
+ else
+ Error(Loc, ".abort '" + Str + "' detected. Assembly stopping.");
+ // FIXME: Actually abort assembly here.
+
+ return false;
+}
+
+/// ParseDirectiveInclude
+/// ::= .include "filename"
+bool AsmParser::ParseDirectiveInclude() {
+ if (getLexer().isNot(AsmToken::String))
+ return TokError("expected string in '.include' directive");
+
+ std::string Filename = getTok().getString();
+ SMLoc IncludeLoc = getLexer().getLoc();
+ Lex();
+
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.include' directive");
+
+ // Strip the quotes.
+ Filename = Filename.substr(1, Filename.size()-2);
+
+ // Attempt to switch the lexer to the included file before consuming the end
+ // of statement to avoid losing it when we switch.
+ if (EnterIncludeFile(Filename)) {
+ Error(IncludeLoc, "Could not find include file '" + Filename + "'");
+ return true;
+ }
+
+ return false;
+}
+
+/// ParseDirectiveIf
+/// ::= .if expression
+bool AsmParser::ParseDirectiveIf(SMLoc DirectiveLoc) {
+ TheCondStack.push_back(TheCondState);
+ TheCondState.TheCond = AsmCond::IfCond;
+ if(TheCondState.Ignore) {
+ EatToEndOfStatement();
+ }
+ else {
+ int64_t ExprValue;
+ if (ParseAbsoluteExpression(ExprValue))
+ return true;
+
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.if' directive");
+
+ Lex();
+
+ TheCondState.CondMet = ExprValue;
+ TheCondState.Ignore = !TheCondState.CondMet;
+ }
+
+ return false;
+}
+
+/// ParseDirectiveElseIf
+/// ::= .elseif expression
+bool AsmParser::ParseDirectiveElseIf(SMLoc DirectiveLoc) {
+ if (TheCondState.TheCond != AsmCond::IfCond &&
+ TheCondState.TheCond != AsmCond::ElseIfCond)
+ Error(DirectiveLoc, "Encountered a .elseif that doesn't follow a .if or "
+ " an .elseif");
+ TheCondState.TheCond = AsmCond::ElseIfCond;
+
+ bool LastIgnoreState = false;
+ if (!TheCondStack.empty())
+ LastIgnoreState = TheCondStack.back().Ignore;
+ if (LastIgnoreState || TheCondState.CondMet) {
+ TheCondState.Ignore = true;
+ EatToEndOfStatement();
+ }
+ else {
+ int64_t ExprValue;
+ if (ParseAbsoluteExpression(ExprValue))
+ return true;
+
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.elseif' directive");
+
+ Lex();
+ TheCondState.CondMet = ExprValue;
+ TheCondState.Ignore = !TheCondState.CondMet;
+ }
+
+ return false;
+}
+
+/// ParseDirectiveElse
+/// ::= .else
+bool AsmParser::ParseDirectiveElse(SMLoc DirectiveLoc) {
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.else' directive");
+
+ Lex();
+
+ if (TheCondState.TheCond != AsmCond::IfCond &&
+ TheCondState.TheCond != AsmCond::ElseIfCond)
+ Error(DirectiveLoc, "Encountered a .else that doesn't follow a .if or an "
+ ".elseif");
+ TheCondState.TheCond = AsmCond::ElseCond;
+ bool LastIgnoreState = false;
+ if (!TheCondStack.empty())
+ LastIgnoreState = TheCondStack.back().Ignore;
+ if (LastIgnoreState || TheCondState.CondMet)
+ TheCondState.Ignore = true;
+ else
+ TheCondState.Ignore = false;
+
+ return false;
+}
+
+/// ParseDirectiveEndIf
+/// ::= .endif
+bool AsmParser::ParseDirectiveEndIf(SMLoc DirectiveLoc) {
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.endif' directive");
+
+ Lex();
+
+ if ((TheCondState.TheCond == AsmCond::NoCond) ||
+ TheCondStack.empty())
+ Error(DirectiveLoc, "Encountered a .endif that doesn't follow a .if or "
+ ".else");
+ if (!TheCondStack.empty()) {
+ TheCondState = TheCondStack.back();
+ TheCondStack.pop_back();
+ }
+
+ return false;
+}
+
+/// ParseDirectiveFile
+/// ::= .file [number] string
+bool GenericAsmParser::ParseDirectiveFile(StringRef, SMLoc DirectiveLoc) {
+ // FIXME: I'm not sure what this is.
+ int64_t FileNumber = -1;
+ SMLoc FileNumberLoc = getLexer().getLoc();
+ if (getLexer().is(AsmToken::Integer)) {
+ FileNumber = getTok().getIntVal();
+ Lex();
+
+ if (FileNumber < 1)
+ return TokError("file number less than one");
+ }
+
+ if (getLexer().isNot(AsmToken::String))
+ return TokError("unexpected token in '.file' directive");
+
+ StringRef Filename = getTok().getString();
+ Filename = Filename.substr(1, Filename.size()-2);
+ Lex();
+
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.file' directive");
+
+ if (FileNumber == -1)
+ getStreamer().EmitFileDirective(Filename);
+ else {
+ if (getContext().GetDwarfFile(Filename, FileNumber) == 0)
+ Error(FileNumberLoc, "file number already allocated");
+ getStreamer().EmitDwarfFileDirective(FileNumber, Filename);
+ }
+
+ return false;
+}
+
+/// ParseDirectiveLine
+/// ::= .line [number]
+bool GenericAsmParser::ParseDirectiveLine(StringRef, SMLoc DirectiveLoc) {
+ if (getLexer().isNot(AsmToken::EndOfStatement)) {
+ if (getLexer().isNot(AsmToken::Integer))
+ return TokError("unexpected token in '.line' directive");
+
+ int64_t LineNumber = getTok().getIntVal();
+ (void) LineNumber;
+ Lex();
+
+ // FIXME: Do something with the .line.
+ }
+
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.line' directive");
+
+ return false;
+}
+
+
+/// ParseDirectiveLoc
+/// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end]
+/// [epilogue_begin] [is_stmt VALUE] [isa VALUE]
+/// The first number is a file number, must have been previously assigned with
+/// a .file directive, the second number is the line number and optionally the
+/// third number is a column position (zero if not specified). The remaining
+/// optional items are .loc sub-directives.
+bool GenericAsmParser::ParseDirectiveLoc(StringRef, SMLoc DirectiveLoc) {
+
+ if (getLexer().isNot(AsmToken::Integer))
+ return TokError("unexpected token in '.loc' directive");
+ int64_t FileNumber = getTok().getIntVal();
+ if (FileNumber < 1)
+ return TokError("file number less than one in '.loc' directive");
+ if (!getContext().ValidateDwarfFileNumber(FileNumber))
+ return TokError("unassigned file number in '.loc' directive");
+ Lex();
+
+ int64_t LineNumber = 0;
+ if (getLexer().is(AsmToken::Integer)) {
+ LineNumber = getTok().getIntVal();
+ if (LineNumber < 1)
+ return TokError("line number less than one in '.loc' directive");
+ Lex();
+ }
+
+ int64_t ColumnPos = 0;
+ if (getLexer().is(AsmToken::Integer)) {
+ ColumnPos = getTok().getIntVal();
+ if (ColumnPos < 0)
+ return TokError("column position less than zero in '.loc' directive");
+ Lex();
+ }
+
+ unsigned Flags = 0;
+ unsigned Isa = 0;
+ if (getLexer().isNot(AsmToken::EndOfStatement)) {
+ for (;;) {
+ if (getLexer().is(AsmToken::EndOfStatement))
+ break;
+
+ StringRef Name;
+ SMLoc Loc = getTok().getLoc();
+ if (getParser().ParseIdentifier(Name))
+ return TokError("unexpected token in '.loc' directive");
+
+ if (Name == "basic_block")
+ Flags |= DWARF2_FLAG_BASIC_BLOCK;
+ else if (Name == "prologue_end")
+ Flags |= DWARF2_FLAG_PROLOGUE_END;
+ else if (Name == "epilogue_begin")
+ Flags |= DWARF2_FLAG_EPILOGUE_BEGIN;
+ else if (Name == "is_stmt") {
+ SMLoc Loc = getTok().getLoc();
+ const MCExpr *Value;
+ if (getParser().ParseExpression(Value))
+ return true;
+ // The expression must be the constant 0 or 1.
+ if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
+ int Value = MCE->getValue();
+ if (Value == 0)
+ Flags &= ~DWARF2_FLAG_IS_STMT;
+ else if (Value == 1)
+ Flags |= DWARF2_FLAG_IS_STMT;
+ else
+ return Error(Loc, "is_stmt value not 0 or 1");
+ }
+ else {
+ return Error(Loc, "is_stmt value not the constant value of 0 or 1");
+ }
+ }
+ else if (Name == "isa") {
+ SMLoc Loc = getTok().getLoc();
+ const MCExpr *Value;
+ if (getParser().ParseExpression(Value))
+ return true;
+ // The expression must be a constant greater or equal to 0.
+ if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
+ int Value = MCE->getValue();
+ if (Value < 0)
+ return Error(Loc, "isa number less than zero");
+ Isa = Value;
+ }
+ else {
+ return Error(Loc, "isa number not a constant value");
+ }
+ }
+ else {
+ return Error(Loc, "unknown sub-directive in '.loc' directive");
+ }
+
+ if (getLexer().is(AsmToken::EndOfStatement))
+ break;
+ }
+ }
+
+ getContext().setCurrentDwarfLoc(FileNumber, LineNumber, ColumnPos, Flags,Isa);
+
+ return false;
+}
+
+/// ParseDirectiveMacrosOnOff
+/// ::= .macros_on
+/// ::= .macros_off
+bool GenericAsmParser::ParseDirectiveMacrosOnOff(StringRef Directive,
+ SMLoc DirectiveLoc) {
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return Error(getLexer().getLoc(),
+ "unexpected token in '" + Directive + "' directive");
+
+ getParser().MacrosEnabled = Directive == ".macros_on";
+
+ return false;
+}
+
+/// ParseDirectiveMacro
+/// ::= .macro name
+bool GenericAsmParser::ParseDirectiveMacro(StringRef Directive,
+ SMLoc DirectiveLoc) {
+ StringRef Name;
+ if (getParser().ParseIdentifier(Name))
+ return TokError("expected identifier in directive");
+
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.macro' directive");
+
+ // Eat the end of statement.
+ Lex();
+
+ AsmToken EndToken, StartToken = getTok();
+
+ // Lex the macro definition.
+ for (;;) {
+ // Check whether we have reached the end of the file.
+ if (getLexer().is(AsmToken::Eof))
+ return Error(DirectiveLoc, "no matching '.endmacro' in definition");
+
+ // Otherwise, check whether we have reach the .endmacro.
+ if (getLexer().is(AsmToken::Identifier) &&
+ (getTok().getIdentifier() == ".endm" ||
+ getTok().getIdentifier() == ".endmacro")) {
+ EndToken = getTok();
+ Lex();
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '" + EndToken.getIdentifier() +
+ "' directive");
+ break;
+ }
+
+ // Otherwise, scan til the end of the statement.
+ getParser().EatToEndOfStatement();
+ }
+
+ if (getParser().MacroMap.lookup(Name)) {
+ return Error(DirectiveLoc, "macro '" + Name + "' is already defined");
+ }
+
+ const char *BodyStart = StartToken.getLoc().getPointer();
+ const char *BodyEnd = EndToken.getLoc().getPointer();
+ StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
+ getParser().MacroMap[Name] = new Macro(Name, Body);
+ return false;
+}
+
+/// ParseDirectiveEndMacro
+/// ::= .endm
+/// ::= .endmacro
+bool GenericAsmParser::ParseDirectiveEndMacro(StringRef Directive,
+ SMLoc DirectiveLoc) {
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '" + Directive + "' directive");
+
+ // If we are inside a macro instantiation, terminate the current
+ // instantiation.
+ if (!getParser().ActiveMacros.empty()) {
+ getParser().HandleMacroExit();
+ return false;
+ }
+
+ // Otherwise, this .endmacro is a stray entry in the file; well formed
+ // .endmacro directives are handled during the macro definition parsing.
+ return TokError("unexpected '" + Directive + "' in file, "
+ "no current macro definition");
+}
+
+/// \brief Create an MCAsmParser instance.
+MCAsmParser *llvm::createMCAsmParser(const Target &T, SourceMgr &SM,
+ MCContext &C, MCStreamer &Out,
+ const MCAsmInfo &MAI) {
+ return new AsmParser(T, SM, C, Out, MAI);
+}
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