llvm-6502/lib/MC/MCParser/COFFAsmParser.cpp

482 lines
15 KiB
C++

//===- COFFAsmParser.cpp - COFF Assembly Parser ---------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCParser/MCAsmParserExtension.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCParser/MCAsmLexer.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSectionCOFF.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCTargetAsmParser.h"
#include "llvm/Support/COFF.h"
using namespace llvm;
namespace {
class COFFAsmParser : public MCAsmParserExtension {
template<bool (COFFAsmParser::*Handler)(StringRef, SMLoc)>
void AddDirectiveHandler(StringRef Directive) {
getParser().AddDirectiveHandler(this, Directive,
HandleDirective<COFFAsmParser, Handler>);
}
bool ParseSectionSwitch(StringRef Section,
unsigned Characteristics,
SectionKind Kind);
virtual void Initialize(MCAsmParser &Parser) {
// Call the base implementation.
MCAsmParserExtension::Initialize(Parser);
AddDirectiveHandler<&COFFAsmParser::ParseSectionDirectiveText>(".text");
AddDirectiveHandler<&COFFAsmParser::ParseSectionDirectiveData>(".data");
AddDirectiveHandler<&COFFAsmParser::ParseSectionDirectiveBSS>(".bss");
AddDirectiveHandler<&COFFAsmParser::ParseDirectiveDef>(".def");
AddDirectiveHandler<&COFFAsmParser::ParseDirectiveScl>(".scl");
AddDirectiveHandler<&COFFAsmParser::ParseDirectiveType>(".type");
AddDirectiveHandler<&COFFAsmParser::ParseDirectiveEndef>(".endef");
// Win64 EH directives.
AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveStartProc>(
".seh_proc");
AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveEndProc>(
".seh_endproc");
AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveStartChained>(
".seh_startchained");
AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveEndChained>(
".seh_endchained");
AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveHandler>(
".seh_handler");
AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveHandlerData>(
".seh_handlerdata");
AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectivePushReg>(
".seh_pushreg");
AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveSetFrame>(
".seh_setframe");
AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveAllocStack>(
".seh_stackalloc");
AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveSaveReg>(
".seh_savereg");
AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveSaveXMM>(
".seh_savexmm");
AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectivePushFrame>(
".seh_pushframe");
AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveEndProlog>(
".seh_endprologue");
AddDirectiveHandler<&COFFAsmParser::ParseDirectiveSymbolAttribute>(".weak");
}
bool ParseSectionDirectiveText(StringRef, SMLoc) {
return ParseSectionSwitch(".text",
COFF::IMAGE_SCN_CNT_CODE
| COFF::IMAGE_SCN_MEM_EXECUTE
| COFF::IMAGE_SCN_MEM_READ,
SectionKind::getText());
}
bool ParseSectionDirectiveData(StringRef, SMLoc) {
return ParseSectionSwitch(".data",
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA
| COFF::IMAGE_SCN_MEM_READ
| COFF::IMAGE_SCN_MEM_WRITE,
SectionKind::getDataRel());
}
bool ParseSectionDirectiveBSS(StringRef, SMLoc) {
return ParseSectionSwitch(".bss",
COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA
| COFF::IMAGE_SCN_MEM_READ
| COFF::IMAGE_SCN_MEM_WRITE,
SectionKind::getBSS());
}
bool ParseDirectiveDef(StringRef, SMLoc);
bool ParseDirectiveScl(StringRef, SMLoc);
bool ParseDirectiveType(StringRef, SMLoc);
bool ParseDirectiveEndef(StringRef, SMLoc);
// Win64 EH directives.
bool ParseSEHDirectiveStartProc(StringRef, SMLoc);
bool ParseSEHDirectiveEndProc(StringRef, SMLoc);
bool ParseSEHDirectiveStartChained(StringRef, SMLoc);
bool ParseSEHDirectiveEndChained(StringRef, SMLoc);
bool ParseSEHDirectiveHandler(StringRef, SMLoc);
bool ParseSEHDirectiveHandlerData(StringRef, SMLoc);
bool ParseSEHDirectivePushReg(StringRef, SMLoc);
bool ParseSEHDirectiveSetFrame(StringRef, SMLoc);
bool ParseSEHDirectiveAllocStack(StringRef, SMLoc);
bool ParseSEHDirectiveSaveReg(StringRef, SMLoc);
bool ParseSEHDirectiveSaveXMM(StringRef, SMLoc);
bool ParseSEHDirectivePushFrame(StringRef, SMLoc);
bool ParseSEHDirectiveEndProlog(StringRef, SMLoc);
bool ParseAtUnwindOrAtExcept(bool &unwind, bool &except);
bool ParseSEHRegisterNumber(unsigned &RegNo);
bool ParseDirectiveSymbolAttribute(StringRef Directive, SMLoc);
public:
COFFAsmParser() {}
};
} // end annonomous namespace.
/// ParseDirectiveSymbolAttribute
/// ::= { ".weak", ... } [ identifier ( , identifier )* ]
bool COFFAsmParser::ParseDirectiveSymbolAttribute(StringRef Directive, SMLoc) {
MCSymbolAttr Attr = StringSwitch<MCSymbolAttr>(Directive)
.Case(".weak", MCSA_Weak)
.Default(MCSA_Invalid);
assert(Attr != MCSA_Invalid && "unexpected symbol attribute directive!");
if (getLexer().isNot(AsmToken::EndOfStatement)) {
for (;;) {
StringRef Name;
if (getParser().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;
}
bool COFFAsmParser::ParseSectionSwitch(StringRef Section,
unsigned Characteristics,
SectionKind Kind) {
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in section switching directive");
Lex();
getStreamer().SwitchSection(getContext().getCOFFSection(
Section, Characteristics, Kind));
return false;
}
bool COFFAsmParser::ParseDirectiveDef(StringRef, SMLoc) {
StringRef SymbolName;
if (getParser().ParseIdentifier(SymbolName))
return TokError("expected identifier in directive");
MCSymbol *Sym = getContext().GetOrCreateSymbol(SymbolName);
getStreamer().BeginCOFFSymbolDef(Sym);
Lex();
return false;
}
bool COFFAsmParser::ParseDirectiveScl(StringRef, SMLoc) {
int64_t SymbolStorageClass;
if (getParser().ParseAbsoluteExpression(SymbolStorageClass))
return true;
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in directive");
Lex();
getStreamer().EmitCOFFSymbolStorageClass(SymbolStorageClass);
return false;
}
bool COFFAsmParser::ParseDirectiveType(StringRef, SMLoc) {
int64_t Type;
if (getParser().ParseAbsoluteExpression(Type))
return true;
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in directive");
Lex();
getStreamer().EmitCOFFSymbolType(Type);
return false;
}
bool COFFAsmParser::ParseDirectiveEndef(StringRef, SMLoc) {
Lex();
getStreamer().EndCOFFSymbolDef();
return false;
}
bool COFFAsmParser::ParseSEHDirectiveStartProc(StringRef, SMLoc) {
StringRef SymbolID;
if (getParser().ParseIdentifier(SymbolID))
return true;
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in directive");
MCSymbol *Symbol = getContext().GetOrCreateSymbol(SymbolID);
Lex();
getStreamer().EmitWin64EHStartProc(Symbol);
return false;
}
bool COFFAsmParser::ParseSEHDirectiveEndProc(StringRef, SMLoc) {
Lex();
getStreamer().EmitWin64EHEndProc();
return false;
}
bool COFFAsmParser::ParseSEHDirectiveStartChained(StringRef, SMLoc) {
Lex();
getStreamer().EmitWin64EHStartChained();
return false;
}
bool COFFAsmParser::ParseSEHDirectiveEndChained(StringRef, SMLoc) {
Lex();
getStreamer().EmitWin64EHEndChained();
return false;
}
bool COFFAsmParser::ParseSEHDirectiveHandler(StringRef, SMLoc) {
StringRef SymbolID;
if (getParser().ParseIdentifier(SymbolID))
return true;
if (getLexer().isNot(AsmToken::Comma))
return TokError("you must specify one or both of @unwind or @except");
Lex();
bool unwind = false, except = false;
if (ParseAtUnwindOrAtExcept(unwind, except))
return true;
if (getLexer().is(AsmToken::Comma)) {
Lex();
if (ParseAtUnwindOrAtExcept(unwind, except))
return true;
}
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in directive");
MCSymbol *handler = getContext().GetOrCreateSymbol(SymbolID);
Lex();
getStreamer().EmitWin64EHHandler(handler, unwind, except);
return false;
}
bool COFFAsmParser::ParseSEHDirectiveHandlerData(StringRef, SMLoc) {
Lex();
getStreamer().EmitWin64EHHandlerData();
return false;
}
bool COFFAsmParser::ParseSEHDirectivePushReg(StringRef, SMLoc L) {
unsigned Reg;
if (ParseSEHRegisterNumber(Reg))
return true;
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in directive");
Lex();
getStreamer().EmitWin64EHPushReg(Reg);
return false;
}
bool COFFAsmParser::ParseSEHDirectiveSetFrame(StringRef, SMLoc L) {
unsigned Reg;
int64_t Off;
if (ParseSEHRegisterNumber(Reg))
return true;
if (getLexer().isNot(AsmToken::Comma))
return TokError("you must specify a stack pointer offset");
Lex();
SMLoc startLoc = getLexer().getLoc();
if (getParser().ParseAbsoluteExpression(Off))
return true;
if (Off & 0x0F)
return Error(startLoc, "offset is not a multiple of 16");
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in directive");
Lex();
getStreamer().EmitWin64EHSetFrame(Reg, Off);
return false;
}
bool COFFAsmParser::ParseSEHDirectiveAllocStack(StringRef, SMLoc) {
int64_t Size;
SMLoc startLoc = getLexer().getLoc();
if (getParser().ParseAbsoluteExpression(Size))
return true;
if (Size & 7)
return Error(startLoc, "size is not a multiple of 8");
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in directive");
Lex();
getStreamer().EmitWin64EHAllocStack(Size);
return false;
}
bool COFFAsmParser::ParseSEHDirectiveSaveReg(StringRef, SMLoc L) {
unsigned Reg;
int64_t Off;
if (ParseSEHRegisterNumber(Reg))
return true;
if (getLexer().isNot(AsmToken::Comma))
return TokError("you must specify an offset on the stack");
Lex();
SMLoc startLoc = getLexer().getLoc();
if (getParser().ParseAbsoluteExpression(Off))
return true;
if (Off & 7)
return Error(startLoc, "size is not a multiple of 8");
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in directive");
Lex();
// FIXME: Err on %xmm* registers
getStreamer().EmitWin64EHSaveReg(Reg, Off);
return false;
}
// FIXME: This method is inherently x86-specific. It should really be in the
// x86 backend.
bool COFFAsmParser::ParseSEHDirectiveSaveXMM(StringRef, SMLoc L) {
unsigned Reg;
int64_t Off;
if (ParseSEHRegisterNumber(Reg))
return true;
if (getLexer().isNot(AsmToken::Comma))
return TokError("you must specify an offset on the stack");
Lex();
SMLoc startLoc = getLexer().getLoc();
if (getParser().ParseAbsoluteExpression(Off))
return true;
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in directive");
if (Off & 0x0F)
return Error(startLoc, "offset is not a multiple of 16");
Lex();
// FIXME: Err on non-%xmm* registers
getStreamer().EmitWin64EHSaveXMM(Reg, Off);
return false;
}
bool COFFAsmParser::ParseSEHDirectivePushFrame(StringRef, SMLoc) {
bool Code = false;
StringRef CodeID;
if (getLexer().is(AsmToken::At)) {
SMLoc startLoc = getLexer().getLoc();
Lex();
if (!getParser().ParseIdentifier(CodeID)) {
if (CodeID != "code")
return Error(startLoc, "expected @code");
Code = true;
}
}
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in directive");
Lex();
getStreamer().EmitWin64EHPushFrame(Code);
return false;
}
bool COFFAsmParser::ParseSEHDirectiveEndProlog(StringRef, SMLoc) {
Lex();
getStreamer().EmitWin64EHEndProlog();
return false;
}
bool COFFAsmParser::ParseAtUnwindOrAtExcept(bool &unwind, bool &except) {
StringRef identifier;
if (getLexer().isNot(AsmToken::At))
return TokError("a handler attribute must begin with '@'");
SMLoc startLoc = getLexer().getLoc();
Lex();
if (getParser().ParseIdentifier(identifier))
return Error(startLoc, "expected @unwind or @except");
if (identifier == "unwind")
unwind = true;
else if (identifier == "except")
except = true;
else
return Error(startLoc, "expected @unwind or @except");
return false;
}
bool COFFAsmParser::ParseSEHRegisterNumber(unsigned &RegNo) {
SMLoc startLoc = getLexer().getLoc();
if (getLexer().is(AsmToken::Percent)) {
const MCRegisterInfo &MRI = getContext().getRegisterInfo();
SMLoc endLoc;
unsigned LLVMRegNo;
if (getParser().getTargetParser().ParseRegister(LLVMRegNo,startLoc,endLoc))
return true;
#if 0
// FIXME: TargetAsmInfo::getCalleeSavedRegs() commits a serious layering
// violation so this validation code is disabled.
// Check that this is a non-volatile register.
const unsigned *NVRegs = TAI.getCalleeSavedRegs();
unsigned i;
for (i = 0; NVRegs[i] != 0; ++i)
if (NVRegs[i] == LLVMRegNo)
break;
if (NVRegs[i] == 0)
return Error(startLoc, "expected non-volatile register");
#endif
int SEHRegNo = MRI.getSEHRegNum(LLVMRegNo);
if (SEHRegNo < 0)
return Error(startLoc,"register can't be represented in SEH unwind info");
RegNo = SEHRegNo;
}
else {
int64_t n;
if (getParser().ParseAbsoluteExpression(n))
return true;
if (n > 15)
return Error(startLoc, "register number is too high");
RegNo = n;
}
return false;
}
namespace llvm {
MCAsmParserExtension *createCOFFAsmParser() {
return new COFFAsmParser;
}
}