#include "llvm/MC/MCParser/AsmParser.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetAsmParser.h"
using namespace llvm;
enum { DEFAULT_ADDRSPACE = 0 };
typedef StringMap<const MCSectionMachO*> MachOUniqueMapTy;
AsmParser::AsmParser(SourceMgr &_SM, MCContext &_Ctx, MCStreamer &_Out,
const MCAsmInfo &_MAI)
: Lexer(_MAI), Ctx(_Ctx), Out(_Out), SrcMgr(_SM), TargetParser(0),
CurBuffer(0), SectionUniquingMap(0) {
Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
AddDirectiveHandler(".file", &AsmParser::ParseDirectiveFile);
AddDirectiveHandler(".line", &AsmParser::ParseDirectiveLine);
AddDirectiveHandler(".loc", &AsmParser::ParseDirectiveLoc);
}
AsmParser::~AsmParser() {
delete (MachOUniqueMapTy*)SectionUniquingMap;
}
const MCSection *AsmParser::getMachOSection(const StringRef &Segment,
const StringRef &Section,
unsigned TypeAndAttributes,
unsigned Reserved2,
SectionKind Kind) const {
if (SectionUniquingMap == 0)
SectionUniquingMap = new MachOUniqueMapTy();
MachOUniqueMapTy &Map = *(MachOUniqueMapTy*)SectionUniquingMap;
SmallString<64> Name;
Name += Segment;
Name.push_back(',');
Name += Section;
const MCSectionMachO *&Entry = Map[Name.str()];
if (Entry) return Entry;
return Entry = MCSectionMachO::Create(Segment, Section, TypeAndAttributes,
Reserved2, Kind, Ctx);
}
void AsmParser::Warning(SMLoc L, const Twine &Msg) {
PrintMessage(L, Msg.str(), "warning");
}
bool AsmParser::Error(SMLoc L, const Twine &Msg) {
PrintMessage(L, Msg.str(), "error");
return true;
}
bool AsmParser::TokError(const char *Msg) {
PrintMessage(Lexer.getLoc(), Msg, "error");
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;
}
const AsmToken &AsmParser::Lex() {
const AsmToken *tok = &Lexer.Lex();
if (tok->is(AsmToken::Eof)) {
SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
if (ParentIncludeLoc != SMLoc()) {
CurBuffer = SrcMgr.FindBufferContainingLoc(ParentIncludeLoc);
Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer),
ParentIncludeLoc.getPointer());
tok = &Lexer.Lex();
}
}
if (tok->is(AsmToken::Error))
PrintMessage(Lexer.getErrLoc(), Lexer.getErr(), "error");
return *tok;
}
bool AsmParser::Run(bool NoInitialTextSection) {
if (!NoInitialTextSection)
Out.SwitchSection(getMachOSection("__TEXT", "__text",
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
0, SectionKind::getText()));
Lex();
bool HadError = false;
AsmCond StartingCondState = TheCondState;
while (Lexer.isNot(AsmToken::Eof)) {
if (Lexer.getKind() == AsmToken::Identifier) {
AsmToken ID = getTok();
SMLoc IDLoc = ID.getLoc();
StringRef IDVal = ID.getString();
if (IDVal == ".if" ||
IDVal == ".elseif" ||
IDVal == ".else" ||
IDVal == ".endif") {
if (!ParseConditionalAssemblyDirectives(IDVal, IDLoc))
continue;
HadError = true;
EatToEndOfStatement();
continue;
}
}
if (TheCondState.Ignore) {
EatToEndOfStatement();
continue;
}
if (!ParseStatement()) continue;
HadError = true;
EatToEndOfStatement();
}
if (TheCondState.TheCond != StartingCondState.TheCond ||
TheCondState.Ignore != StartingCondState.Ignore)
return TokError("unmatched .ifs or .elses");
if (!HadError)
Out.Finish();
return HadError;
}
bool AsmParser::ParseConditionalAssemblyDirectives(StringRef Directive,
SMLoc DirectiveLoc) {
if (Directive == ".if")
return ParseDirectiveIf(DirectiveLoc);
if (Directive == ".elseif")
return ParseDirectiveElseIf(DirectiveLoc);
if (Directive == ".else")
return ParseDirectiveElse(DirectiveLoc);
if (Directive == ".endif")
return ParseDirectiveEndIf(DirectiveLoc);
return true;
}
void AsmParser::EatToEndOfStatement() {
while (Lexer.isNot(AsmToken::EndOfStatement) &&
Lexer.isNot(AsmToken::Eof))
Lex();
if (Lexer.is(AsmToken::EndOfStatement))
Lex();
}
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;
}
MCSymbol *AsmParser::CreateSymbol(StringRef Name) {
if (Name.startswith("L"))
return Ctx.GetOrCreateTemporarySymbol(Name);
return Ctx.GetOrCreateSymbol(Name);
}
bool AsmParser::ParsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) {
switch (Lexer.getKind()) {
default:
return TokError("unknown token in expression");
case AsmToken::Exclaim:
Lex(); if (ParsePrimaryExpr(Res, EndLoc))
return true;
Res = MCUnaryExpr::CreateLNot(Res, getContext());
return false;
case AsmToken::String:
case AsmToken::Identifier: {
std::pair<StringRef, StringRef> Split = getTok().getIdentifier().split('@');
MCSymbol *Sym = CreateSymbol(Split.first);
MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
if (Split.first.size() != getTok().getIdentifier().size())
Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
EndLoc = Lexer.getLoc();
Lex();
if (Sym->getValue() && isa<MCConstantExpr>(Sym->getValue())) {
if (Variant)
return Error(EndLoc, "unexpected modified on variable reference");
Res = Sym->getValue();
return false;
}
Res = MCSymbolRefExpr::Create(Sym, Variant, getContext());
return false;
}
case AsmToken::Integer:
Res = MCConstantExpr::Create(getTok().getIntVal(), getContext());
EndLoc = Lexer.getLoc();
Lex(); return false;
case AsmToken::LParen:
Lex(); return ParseParenExpr(Res, EndLoc);
case AsmToken::Minus:
Lex(); if (ParsePrimaryExpr(Res, EndLoc))
return true;
Res = MCUnaryExpr::CreateMinus(Res, getContext());
return false;
case AsmToken::Plus:
Lex(); if (ParsePrimaryExpr(Res, EndLoc))
return true;
Res = MCUnaryExpr::CreatePlus(Res, getContext());
return false;
case AsmToken::Tilde:
Lex(); 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);
}
bool AsmParser::ParseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
Res = 0;
if (ParsePrimaryExpr(Res, EndLoc) || ParseBinOpRHS(1, Res, EndLoc))
return true;
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;
case AsmToken::AmpAmp:
Kind = MCBinaryExpr::LAnd;
return 1;
case AsmToken::PipePipe:
Kind = MCBinaryExpr::LOr;
return 1;
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;
case AsmToken::Pipe:
Kind = MCBinaryExpr::Or;
return 3;
case AsmToken::Caret:
Kind = MCBinaryExpr::Xor;
return 3;
case AsmToken::Amp:
Kind = MCBinaryExpr::And;
return 3;
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;
}
}
bool AsmParser::ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
SMLoc &EndLoc) {
while (1) {
MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
if (TokPrec < Precedence)
return false;
Lex();
const MCExpr *RHS;
if (ParsePrimaryExpr(RHS, EndLoc)) return true;
MCBinaryExpr::Opcode Dummy;
unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
if (TokPrec < NextTokPrec) {
if (ParseBinOpRHS(Precedence+1, RHS, EndLoc)) return true;
}
Res = MCBinaryExpr::Create(Kind, Res, RHS, getContext());
}
}
bool AsmParser::ParseStatement() {
if (Lexer.is(AsmToken::EndOfStatement)) {
Lex();
return false;
}
AsmToken ID = getTok();
SMLoc IDLoc = ID.getLoc();
StringRef IDVal;
if (ParseIdentifier(IDVal))
return TokError("unexpected token at start of statement");
switch (Lexer.getKind()) {
case AsmToken::Colon: {
Lex();
MCSymbol *Sym = CreateSymbol(IDVal);
if (!Sym->isUndefined())
return Error(IDLoc, "invalid symbol redefinition");
Out.EmitLabel(Sym);
return ParseStatement();
}
case AsmToken::Equal:
Lex();
return ParseAssignment(IDVal);
default: break;
}
if (IDVal[0] == '.') {
if (IDVal == ".section")
return ParseDirectiveDarwinSection();
if (IDVal == ".text")
return ParseDirectiveSectionSwitch("__TEXT", "__text",
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS);
if (IDVal == ".const")
return ParseDirectiveSectionSwitch("__TEXT", "__const");
if (IDVal == ".static_const")
return ParseDirectiveSectionSwitch("__TEXT", "__static_const");
if (IDVal == ".cstring")
return ParseDirectiveSectionSwitch("__TEXT","__cstring",
MCSectionMachO::S_CSTRING_LITERALS);
if (IDVal == ".literal4")
return ParseDirectiveSectionSwitch("__TEXT", "__literal4",
MCSectionMachO::S_4BYTE_LITERALS,
4);
if (IDVal == ".literal8")
return ParseDirectiveSectionSwitch("__TEXT", "__literal8",
MCSectionMachO::S_8BYTE_LITERALS,
8);
if (IDVal == ".literal16")
return ParseDirectiveSectionSwitch("__TEXT","__literal16",
MCSectionMachO::S_16BYTE_LITERALS,
16);
if (IDVal == ".constructor")
return ParseDirectiveSectionSwitch("__TEXT","__constructor");
if (IDVal == ".destructor")
return ParseDirectiveSectionSwitch("__TEXT","__destructor");
if (IDVal == ".fvmlib_init0")
return ParseDirectiveSectionSwitch("__TEXT","__fvmlib_init0");
if (IDVal == ".fvmlib_init1")
return ParseDirectiveSectionSwitch("__TEXT","__fvmlib_init1");
if (IDVal == ".symbol_stub")
return ParseDirectiveSectionSwitch("__TEXT","__symbol_stub",
MCSectionMachO::S_SYMBOL_STUBS |
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
0, 16);
if (IDVal == ".picsymbol_stub")
return ParseDirectiveSectionSwitch("__TEXT","__picsymbol_stub",
MCSectionMachO::S_SYMBOL_STUBS |
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
0, 26);
if (IDVal == ".data")
return ParseDirectiveSectionSwitch("__DATA", "__data");
if (IDVal == ".static_data")
return ParseDirectiveSectionSwitch("__DATA", "__static_data");
if (IDVal == ".non_lazy_symbol_pointer")
return ParseDirectiveSectionSwitch("__DATA", "__nl_symbol_ptr",
MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
4);
if (IDVal == ".lazy_symbol_pointer")
return ParseDirectiveSectionSwitch("__DATA", "__la_symbol_ptr",
MCSectionMachO::S_LAZY_SYMBOL_POINTERS,
4);
if (IDVal == ".dyld")
return ParseDirectiveSectionSwitch("__DATA", "__dyld");
if (IDVal == ".mod_init_func")
return ParseDirectiveSectionSwitch("__DATA", "__mod_init_func",
MCSectionMachO::S_MOD_INIT_FUNC_POINTERS,
4);
if (IDVal == ".mod_term_func")
return ParseDirectiveSectionSwitch("__DATA", "__mod_term_func",
MCSectionMachO::S_MOD_TERM_FUNC_POINTERS,
4);
if (IDVal == ".const_data")
return ParseDirectiveSectionSwitch("__DATA", "__const");
if (IDVal == ".objc_class")
return ParseDirectiveSectionSwitch("__OBJC", "__class",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_meta_class")
return ParseDirectiveSectionSwitch("__OBJC", "__meta_class",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_cat_cls_meth")
return ParseDirectiveSectionSwitch("__OBJC", "__cat_cls_meth",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_cat_inst_meth")
return ParseDirectiveSectionSwitch("__OBJC", "__cat_inst_meth",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_protocol")
return ParseDirectiveSectionSwitch("__OBJC", "__protocol",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_string_object")
return ParseDirectiveSectionSwitch("__OBJC", "__string_object",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_cls_meth")
return ParseDirectiveSectionSwitch("__OBJC", "__cls_meth",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_inst_meth")
return ParseDirectiveSectionSwitch("__OBJC", "__inst_meth",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_cls_refs")
return ParseDirectiveSectionSwitch("__OBJC", "__cls_refs",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
MCSectionMachO::S_LITERAL_POINTERS,
4);
if (IDVal == ".objc_message_refs")
return ParseDirectiveSectionSwitch("__OBJC", "__message_refs",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
MCSectionMachO::S_LITERAL_POINTERS,
4);
if (IDVal == ".objc_symbols")
return ParseDirectiveSectionSwitch("__OBJC", "__symbols",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_category")
return ParseDirectiveSectionSwitch("__OBJC", "__category",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_class_vars")
return ParseDirectiveSectionSwitch("__OBJC", "__class_vars",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_instance_vars")
return ParseDirectiveSectionSwitch("__OBJC", "__instance_vars",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_module_info")
return ParseDirectiveSectionSwitch("__OBJC", "__module_info",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
if (IDVal == ".objc_class_names")
return ParseDirectiveSectionSwitch("__TEXT", "__cstring",
MCSectionMachO::S_CSTRING_LITERALS);
if (IDVal == ".objc_meth_var_types")
return ParseDirectiveSectionSwitch("__TEXT", "__cstring",
MCSectionMachO::S_CSTRING_LITERALS);
if (IDVal == ".objc_meth_var_names")
return ParseDirectiveSectionSwitch("__TEXT", "__cstring",
MCSectionMachO::S_CSTRING_LITERALS);
if (IDVal == ".objc_selector_strs")
return ParseDirectiveSectionSwitch("__OBJC", "__selector_strs",
MCSectionMachO::S_CSTRING_LITERALS);
if (IDVal == ".set")
return ParseDirectiveSet();
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")
return ParseDirectiveAlign(true, 1);
if (IDVal == ".align32")
return ParseDirectiveAlign(true, 4);
if (IDVal == ".balign")
return ParseDirectiveAlign(false, 1);
if (IDVal == ".balignw")
return ParseDirectiveAlign(false, 2);
if (IDVal == ".balignl")
return ParseDirectiveAlign(false, 4);
if (IDVal == ".p2align")
return ParseDirectiveAlign(true, 1);
if (IDVal == ".p2alignw")
return ParseDirectiveAlign(true, 2);
if (IDVal == ".p2alignl")
return ParseDirectiveAlign(true, 4);
if (IDVal == ".org")
return ParseDirectiveOrg();
if (IDVal == ".fill")
return ParseDirectiveFill();
if (IDVal == ".space")
return ParseDirectiveSpace();
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 == ".weak")
return ParseDirectiveSymbolAttribute(MCSA_Weak);
if (IDVal == ".weak_definition")
return ParseDirectiveSymbolAttribute(MCSA_WeakDefinition);
if (IDVal == ".weak_reference")
return ParseDirectiveSymbolAttribute(MCSA_WeakReference);
if (IDVal == ".comm")
return ParseDirectiveComm(false);
if (IDVal == ".lcomm")
return ParseDirectiveComm(true);
if (IDVal == ".zerofill")
return ParseDirectiveDarwinZerofill();
if (IDVal == ".desc")
return ParseDirectiveDarwinSymbolDesc();
if (IDVal == ".lsym")
return ParseDirectiveDarwinLsym();
if (IDVal == ".tbss")
return ParseDirectiveDarwinTBSS();
if (IDVal == ".subsections_via_symbols")
return ParseDirectiveDarwinSubsectionsViaSymbols();
if (IDVal == ".abort")
return ParseDirectiveAbort();
if (IDVal == ".include")
return ParseDirectiveInclude();
if (IDVal == ".dump")
return ParseDirectiveDarwinDumpOrLoad(IDLoc, true);
if (IDVal == ".load")
return ParseDirectiveDarwinDumpOrLoad(IDLoc, false);
bool(AsmParser::*Handler)(StringRef, SMLoc) = DirectiveMap[IDVal];
if (Handler)
return (this->*Handler)(IDVal, IDLoc);
if (!getTargetParser().ParseDirective(ID))
return false;
Warning(IDLoc, "ignoring directive for now");
EatToEndOfStatement();
return false;
}
SmallVector<MCParsedAsmOperand*, 8> ParsedOperands;
if (getTargetParser().ParseInstruction(IDVal, IDLoc, ParsedOperands))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in argument list");
Lex();
MCInst Inst;
bool MatchFail = getTargetParser().MatchInstruction(ParsedOperands, Inst);
for (unsigned i = 0, e = ParsedOperands.size(); i != e; ++i)
delete ParsedOperands[i];
if (MatchFail) {
Error(IDLoc, "unrecognized instruction");
return true;
}
Out.EmitInstruction(Inst);
return false;
}
bool AsmParser::ParseAssignment(const StringRef &Name) {
SMLoc EqualLoc = Lexer.getLoc();
const MCExpr *Value;
SMLoc StartLoc = Lexer.getLoc();
if (ParseExpression(Value))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in assignment");
Lex();
MCSymbol *Sym = getContext().LookupSymbol(Name);
if (Sym) {
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->getValue()))
return Error(EqualLoc, "invalid reassignment of non-absolute variable '" +
Name + "'");
} else
Sym = CreateSymbol(Name);
Out.EmitAssignment(Sym, Value);
return false;
}
bool AsmParser::ParseIdentifier(StringRef &Res) {
if (Lexer.isNot(AsmToken::Identifier) &&
Lexer.isNot(AsmToken::String))
return true;
Res = getTok().getIdentifier();
Lex();
return false;
}
bool AsmParser::ParseDirectiveSet() {
StringRef Name;
if (ParseIdentifier(Name))
return TokError("expected identifier after '.set' directive");
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.set'");
Lex();
return ParseAssignment(Name);
}
bool AsmParser::ParseDirectiveDarwinSection() {
SMLoc Loc = Lexer.getLoc();
StringRef SectionName;
if (ParseIdentifier(SectionName))
return Error(Loc, "expected identifier after '.section' directive");
if (!Lexer.is(AsmToken::Comma))
return TokError("unexpected token in '.section' directive");
std::string SectionSpec = SectionName;
SectionSpec += ",";
StringRef EOL = Lexer.LexUntilEndOfStatement();
SectionSpec.append(EOL.begin(), EOL.end());
Lex();
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.section' directive");
Lex();
StringRef Segment, Section;
unsigned TAA, StubSize;
std::string ErrorStr =
MCSectionMachO::ParseSectionSpecifier(SectionSpec, Segment, Section,
TAA, StubSize);
if (!ErrorStr.empty())
return Error(Loc, ErrorStr.c_str());
bool isText = Segment == "__TEXT"; Out.SwitchSection(getMachOSection(Segment, Section, TAA, StubSize,
isText ? SectionKind::getText()
: SectionKind::getDataRel()));
return false;
}
bool AsmParser::ParseDirectiveSectionSwitch(const char *Segment,
const char *Section,
unsigned TAA, unsigned Align,
unsigned StubSize) {
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in section switching directive");
Lex();
bool isText = StringRef(Segment) == "__TEXT"; Out.SwitchSection(getMachOSection(Segment, Section, TAA, StubSize,
isText ? SectionKind::getText()
: SectionKind::getDataRel()));
if (Align)
Out.EmitValueToAlignment(Align, 0, 1, 0);
return false;
}
bool AsmParser::ParseEscapedString(std::string &Data) {
assert(Lexer.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;
}
++i;
if (i == e)
return TokError("unexpected backslash at end of string");
if ((unsigned) (Str[i] - '0') <= 7) {
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;
}
switch (Str[i]) {
default:
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;
}
bool AsmParser::ParseDirectiveAscii(bool ZeroTerminated) {
if (Lexer.isNot(AsmToken::EndOfStatement)) {
for (;;) {
if (Lexer.isNot(AsmToken::String))
return TokError("expected string in '.ascii' or '.asciz' directive");
std::string Data;
if (ParseEscapedString(Data))
return true;
Out.EmitBytes(Data, DEFAULT_ADDRSPACE);
if (ZeroTerminated)
Out.EmitBytes(StringRef("\0", 1), DEFAULT_ADDRSPACE);
Lex();
if (Lexer.is(AsmToken::EndOfStatement))
break;
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.ascii' or '.asciz' directive");
Lex();
}
}
Lex();
return false;
}
bool AsmParser::ParseDirectiveValue(unsigned Size) {
if (Lexer.isNot(AsmToken::EndOfStatement)) {
for (;;) {
const MCExpr *Value;
SMLoc ATTRIBUTE_UNUSED StartLoc = Lexer.getLoc();
if (ParseExpression(Value))
return true;
Out.EmitValue(Value, Size, DEFAULT_ADDRSPACE);
if (Lexer.is(AsmToken::EndOfStatement))
break;
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lex();
}
}
Lex();
return false;
}
bool AsmParser::ParseDirectiveSpace() {
int64_t NumBytes;
if (ParseAbsoluteExpression(NumBytes))
return true;
int64_t FillExpr = 0;
bool HasFillExpr = false;
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.space' directive");
Lex();
if (ParseAbsoluteExpression(FillExpr))
return true;
HasFillExpr = true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.space' directive");
}
Lex();
if (NumBytes <= 0)
return TokError("invalid number of bytes in '.space' directive");
Out.EmitFill(NumBytes, FillExpr, DEFAULT_ADDRSPACE);
return false;
}
bool AsmParser::ParseDirectiveFill() {
int64_t NumValues;
if (ParseAbsoluteExpression(NumValues))
return true;
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.fill' directive");
Lex();
int64_t FillSize;
if (ParseAbsoluteExpression(FillSize))
return true;
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.fill' directive");
Lex();
int64_t FillExpr;
if (ParseAbsoluteExpression(FillExpr))
return true;
if (Lexer.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)
Out.EmitValue(MCConstantExpr::Create(FillExpr, getContext()), FillSize,
DEFAULT_ADDRSPACE);
return false;
}
bool AsmParser::ParseDirectiveOrg() {
const MCExpr *Offset;
SMLoc StartLoc = Lexer.getLoc();
if (ParseExpression(Offset))
return true;
int64_t FillExpr = 0;
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.org' directive");
Lex();
if (ParseAbsoluteExpression(FillExpr))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.org' directive");
}
Lex();
Out.EmitValueToOffset(Offset, FillExpr);
return false;
}
bool AsmParser::ParseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
SMLoc AlignmentLoc = Lexer.getLoc();
int64_t Alignment;
if (ParseAbsoluteExpression(Alignment))
return true;
SMLoc MaxBytesLoc;
bool HasFillExpr = false;
int64_t FillExpr = 0;
int64_t MaxBytesToFill = 0;
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lex();
if (Lexer.isNot(AsmToken::Comma)) {
HasFillExpr = true;
if (ParseAbsoluteExpression(FillExpr))
return true;
}
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lex();
MaxBytesLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(MaxBytesToFill))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in directive");
}
}
Lex();
if (!HasFillExpr) {
FillExpr = 0;
}
if (IsPow2) {
if (Alignment >= 32) {
Error(AlignmentLoc, "invalid alignment value");
Alignment = 31;
}
Alignment = 1ULL << Alignment;
}
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;
}
}
if(Out.getCurrentSection()->getKind().isText() &&
Lexer.getMAI().getTextAlignFillValue() == FillExpr)
Out.EmitCodeAlignment(Alignment, MaxBytesToFill);
else
Out.EmitValueToAlignment(Alignment, FillExpr, ValueSize, MaxBytesToFill);
return false;
}
bool AsmParser::ParseDirectiveSymbolAttribute(MCSymbolAttr Attr) {
if (Lexer.isNot(AsmToken::EndOfStatement)) {
for (;;) {
StringRef Name;
if (ParseIdentifier(Name))
return TokError("expected identifier in directive");
MCSymbol *Sym = CreateSymbol(Name);
Out.EmitSymbolAttribute(Sym, Attr);
if (Lexer.is(AsmToken::EndOfStatement))
break;
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lex();
}
}
Lex();
return false;
}
bool AsmParser::ParseDirectiveDarwinSymbolDesc() {
StringRef Name;
if (ParseIdentifier(Name))
return TokError("expected identifier in directive");
MCSymbol *Sym = CreateSymbol(Name);
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.desc' directive");
Lex();
SMLoc DescLoc = Lexer.getLoc();
int64_t DescValue;
if (ParseAbsoluteExpression(DescValue))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.desc' directive");
Lex();
Out.EmitSymbolDesc(Sym, DescValue);
return false;
}
bool AsmParser::ParseDirectiveComm(bool IsLocal) {
SMLoc IDLoc = Lexer.getLoc();
StringRef Name;
if (ParseIdentifier(Name))
return TokError("expected identifier in directive");
MCSymbol *Sym = CreateSymbol(Name);
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lex();
int64_t Size;
SMLoc SizeLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(Size))
return true;
int64_t Pow2Alignment = 0;
SMLoc Pow2AlignmentLoc;
if (Lexer.is(AsmToken::Comma)) {
Lex();
Pow2AlignmentLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(Pow2Alignment))
return true;
if (Lexer.getMAI().getAlignmentIsInBytes()) {
if (!isPowerOf2_64(Pow2Alignment))
return Error(Pow2AlignmentLoc, "alignment must be a power of 2");
Pow2Alignment = Log2_64(Pow2Alignment);
}
}
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.comm' or '.lcomm' directive");
Lex();
if (Size < 0)
return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't "
"be less than zero");
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");
if (IsLocal) {
Out.EmitZerofill(getMachOSection("__DATA", "__bss",
MCSectionMachO::S_ZEROFILL, 0,
SectionKind::getBSS()),
Sym, Size, 1 << Pow2Alignment);
return false;
}
Out.EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment);
return false;
}
bool AsmParser::ParseDirectiveDarwinZerofill() {
if (Lexer.isNot(AsmToken::Identifier))
return TokError("expected segment name after '.zerofill' directive");
StringRef Segment = getTok().getString();
Lex();
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lex();
if (Lexer.isNot(AsmToken::Identifier))
return TokError("expected section name after comma in '.zerofill' "
"directive");
StringRef Section = getTok().getString();
Lex();
if (Lexer.is(AsmToken::EndOfStatement)) {
Out.EmitZerofill(getMachOSection(Segment, Section,
MCSectionMachO::S_ZEROFILL, 0,
SectionKind::getBSS()));
return false;
}
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lex();
if (Lexer.isNot(AsmToken::Identifier))
return TokError("expected identifier in directive");
SMLoc IDLoc = Lexer.getLoc();
MCSymbol *Sym = CreateSymbol(getTok().getString());
Lex();
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lex();
int64_t Size;
SMLoc SizeLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(Size))
return true;
int64_t Pow2Alignment = 0;
SMLoc Pow2AlignmentLoc;
if (Lexer.is(AsmToken::Comma)) {
Lex();
Pow2AlignmentLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(Pow2Alignment))
return true;
}
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.zerofill' directive");
Lex();
if (Size < 0)
return Error(SizeLoc, "invalid '.zerofill' directive size, can't be less "
"than zero");
if (Pow2Alignment < 0)
return Error(Pow2AlignmentLoc, "invalid '.zerofill' directive alignment, "
"can't be less than zero");
if (!Sym->isUndefined())
return Error(IDLoc, "invalid symbol redefinition");
Out.EmitZerofill(getMachOSection(Segment, Section,
MCSectionMachO::S_ZEROFILL, 0,
SectionKind::getBSS()),
Sym, Size, 1 << Pow2Alignment);
return false;
}
bool AsmParser::ParseDirectiveDarwinTBSS() {
SMLoc IDLoc = Lexer.getLoc();
StringRef Name;
if (ParseIdentifier(Name))
return TokError("expected identifier in directive");
MCSymbol *Sym = CreateSymbol(Name);
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lex();
int64_t Size;
SMLoc SizeLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(Size))
return true;
int64_t Pow2Alignment = 0;
SMLoc Pow2AlignmentLoc;
if (Lexer.is(AsmToken::Comma)) {
Lex();
Pow2AlignmentLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(Pow2Alignment))
return true;
}
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.tbss' directive");
Lex();
if (Size < 0)
return Error(SizeLoc, "invalid '.tbss' directive size, can't be less than"
"zero");
if (Pow2Alignment < 0)
return Error(Pow2AlignmentLoc, "invalid '.tbss' alignment, can't be less"
"than zero");
if (!Sym->isUndefined())
return Error(IDLoc, "invalid symbol redefinition");
Out.EmitTBSSSymbol(Sym, Size, Pow2Alignment ? 1 << Pow2Alignment : 0);
return false;
}
bool AsmParser::ParseDirectiveDarwinSubsectionsViaSymbols() {
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.subsections_via_symbols' directive");
Lex();
Out.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
return false;
}
bool AsmParser::ParseDirectiveAbort() {
SMLoc Loc = Lexer.getLoc();
StringRef Str = "";
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::String))
return TokError("expected string in '.abort' directive");
Str = getTok().getString();
Lex();
}
if (Lexer.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.");
return false;
}
bool AsmParser::ParseDirectiveDarwinLsym() {
StringRef Name;
if (ParseIdentifier(Name))
return TokError("expected identifier in directive");
MCSymbol *Sym = CreateSymbol(Name);
if (Lexer.isNot(AsmToken::Comma))
return TokError("unexpected token in '.lsym' directive");
Lex();
const MCExpr *Value;
SMLoc StartLoc = Lexer.getLoc();
if (ParseExpression(Value))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.lsym' directive");
Lex();
(void) Sym;
return TokError("directive '.lsym' is unsupported");
}
bool AsmParser::ParseDirectiveInclude() {
if (Lexer.isNot(AsmToken::String))
return TokError("expected string in '.include' directive");
std::string Filename = getTok().getString();
SMLoc IncludeLoc = Lexer.getLoc();
Lex();
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.include' directive");
Filename = Filename.substr(1, Filename.size()-2);
if (EnterIncludeFile(Filename)) {
PrintMessage(IncludeLoc,
"Could not find include file '" + Filename + "'",
"error");
return true;
}
return false;
}
bool AsmParser::ParseDirectiveDarwinDumpOrLoad(SMLoc IDLoc, bool IsDump) {
if (Lexer.isNot(AsmToken::String))
return TokError("expected string in '.dump' or '.load' directive");
Lex();
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.dump' or '.load' directive");
Lex();
if (IsDump)
Warning(IDLoc, "ignoring directive .dump for now");
else
Warning(IDLoc, "ignoring directive .load for now");
return false;
}
bool AsmParser::ParseDirectiveIf(SMLoc DirectiveLoc) {
Lex();
TheCondStack.push_back(TheCondState);
TheCondState.TheCond = AsmCond::IfCond;
if(TheCondState.Ignore) {
EatToEndOfStatement();
}
else {
int64_t ExprValue;
if (ParseAbsoluteExpression(ExprValue))
return true;
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.if' directive");
Lex();
TheCondState.CondMet = ExprValue;
TheCondState.Ignore = !TheCondState.CondMet;
}
return false;
}
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;
Lex();
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 (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.elseif' directive");
Lex();
TheCondState.CondMet = ExprValue;
TheCondState.Ignore = !TheCondState.CondMet;
}
return false;
}
bool AsmParser::ParseDirectiveElse(SMLoc DirectiveLoc) {
Lex();
if (Lexer.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;
}
bool AsmParser::ParseDirectiveEndIf(SMLoc DirectiveLoc) {
Lex();
if (Lexer.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;
}
bool AsmParser::ParseDirectiveFile(StringRef, SMLoc DirectiveLoc) {
int64_t FileNumber = -1;
if (Lexer.is(AsmToken::Integer)) {
FileNumber = getTok().getIntVal();
Lex();
if (FileNumber < 1)
return TokError("file number less than one");
}
if (Lexer.isNot(AsmToken::String))
return TokError("unexpected token in '.file' directive");
StringRef Filename = getTok().getString();
Filename = Filename.substr(1, Filename.size()-2);
Lex();
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.file' directive");
if (FileNumber == -1)
Out.EmitFileDirective(Filename);
else
Out.EmitDwarfFileDirective(FileNumber, Filename);
return false;
}
bool AsmParser::ParseDirectiveLine(StringRef, SMLoc DirectiveLoc) {
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::Integer))
return TokError("unexpected token in '.line' directive");
int64_t LineNumber = getTok().getIntVal();
(void) LineNumber;
Lex();
}
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.file' directive");
return false;
}
bool AsmParser::ParseDirectiveLoc(StringRef, SMLoc DirectiveLoc) {
if (Lexer.isNot(AsmToken::Integer))
return TokError("unexpected token in '.loc' directive");
int64_t FileNumber = getTok().getIntVal();
(void) FileNumber;
Lex();
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::Integer))
return TokError("unexpected token in '.loc' directive");
int64_t Param2 = getTok().getIntVal();
(void) Param2;
Lex();
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::Integer))
return TokError("unexpected token in '.loc' directive");
int64_t Param3 = getTok().getIntVal();
(void) Param3;
Lex();
}
}
if (Lexer.isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.file' directive");
return false;
}