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499 lines
16 KiB
C++
499 lines
16 KiB
C++
//===- COFFAsmParser.cpp - COFF Assembly Parser ---------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCParser/MCAsmParserExtension.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCParser/MCAsmLexer.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCSectionCOFF.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCTargetAsmParser.h"
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#include "llvm/Support/COFF.h"
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using namespace llvm;
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namespace {
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class COFFAsmParser : public MCAsmParserExtension {
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template<bool (COFFAsmParser::*Handler)(StringRef, SMLoc)>
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void AddDirectiveHandler(StringRef Directive) {
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getParser().AddDirectiveHandler(this, Directive,
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HandleDirective<COFFAsmParser, Handler>);
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}
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bool ParseSectionSwitch(StringRef Section,
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unsigned Characteristics,
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SectionKind Kind);
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virtual void Initialize(MCAsmParser &Parser) {
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// Call the base implementation.
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MCAsmParserExtension::Initialize(Parser);
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AddDirectiveHandler<&COFFAsmParser::ParseSectionDirectiveText>(".text");
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AddDirectiveHandler<&COFFAsmParser::ParseSectionDirectiveData>(".data");
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AddDirectiveHandler<&COFFAsmParser::ParseSectionDirectiveBSS>(".bss");
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AddDirectiveHandler<&COFFAsmParser::ParseDirectiveDef>(".def");
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AddDirectiveHandler<&COFFAsmParser::ParseDirectiveScl>(".scl");
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AddDirectiveHandler<&COFFAsmParser::ParseDirectiveType>(".type");
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AddDirectiveHandler<&COFFAsmParser::ParseDirectiveEndef>(".endef");
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AddDirectiveHandler<&COFFAsmParser::ParseDirectiveSecRel32>(".secrel32");
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// Win64 EH directives.
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AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveStartProc>(
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".seh_proc");
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AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveEndProc>(
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".seh_endproc");
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AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveStartChained>(
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".seh_startchained");
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AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveEndChained>(
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".seh_endchained");
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AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveHandler>(
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".seh_handler");
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AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveHandlerData>(
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".seh_handlerdata");
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AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectivePushReg>(
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".seh_pushreg");
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AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveSetFrame>(
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".seh_setframe");
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AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveAllocStack>(
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".seh_stackalloc");
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AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveSaveReg>(
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".seh_savereg");
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AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveSaveXMM>(
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".seh_savexmm");
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AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectivePushFrame>(
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".seh_pushframe");
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AddDirectiveHandler<&COFFAsmParser::ParseSEHDirectiveEndProlog>(
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".seh_endprologue");
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AddDirectiveHandler<&COFFAsmParser::ParseDirectiveSymbolAttribute>(".weak");
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}
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bool ParseSectionDirectiveText(StringRef, SMLoc) {
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return ParseSectionSwitch(".text",
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COFF::IMAGE_SCN_CNT_CODE
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| COFF::IMAGE_SCN_MEM_EXECUTE
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| COFF::IMAGE_SCN_MEM_READ,
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SectionKind::getText());
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}
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bool ParseSectionDirectiveData(StringRef, SMLoc) {
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return ParseSectionSwitch(".data",
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COFF::IMAGE_SCN_CNT_INITIALIZED_DATA
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| COFF::IMAGE_SCN_MEM_READ
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| COFF::IMAGE_SCN_MEM_WRITE,
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SectionKind::getDataRel());
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}
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bool ParseSectionDirectiveBSS(StringRef, SMLoc) {
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return ParseSectionSwitch(".bss",
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COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA
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| COFF::IMAGE_SCN_MEM_READ
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| COFF::IMAGE_SCN_MEM_WRITE,
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SectionKind::getBSS());
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}
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bool ParseDirectiveDef(StringRef, SMLoc);
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bool ParseDirectiveScl(StringRef, SMLoc);
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bool ParseDirectiveType(StringRef, SMLoc);
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bool ParseDirectiveEndef(StringRef, SMLoc);
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bool ParseDirectiveSecRel32(StringRef, SMLoc);
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// Win64 EH directives.
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bool ParseSEHDirectiveStartProc(StringRef, SMLoc);
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bool ParseSEHDirectiveEndProc(StringRef, SMLoc);
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bool ParseSEHDirectiveStartChained(StringRef, SMLoc);
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bool ParseSEHDirectiveEndChained(StringRef, SMLoc);
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bool ParseSEHDirectiveHandler(StringRef, SMLoc);
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bool ParseSEHDirectiveHandlerData(StringRef, SMLoc);
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bool ParseSEHDirectivePushReg(StringRef, SMLoc);
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bool ParseSEHDirectiveSetFrame(StringRef, SMLoc);
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bool ParseSEHDirectiveAllocStack(StringRef, SMLoc);
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bool ParseSEHDirectiveSaveReg(StringRef, SMLoc);
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bool ParseSEHDirectiveSaveXMM(StringRef, SMLoc);
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bool ParseSEHDirectivePushFrame(StringRef, SMLoc);
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bool ParseSEHDirectiveEndProlog(StringRef, SMLoc);
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bool ParseAtUnwindOrAtExcept(bool &unwind, bool &except);
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bool ParseSEHRegisterNumber(unsigned &RegNo);
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bool ParseDirectiveSymbolAttribute(StringRef Directive, SMLoc);
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public:
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COFFAsmParser() {}
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};
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} // end annonomous namespace.
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/// ParseDirectiveSymbolAttribute
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/// ::= { ".weak", ... } [ identifier ( , identifier )* ]
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bool COFFAsmParser::ParseDirectiveSymbolAttribute(StringRef Directive, SMLoc) {
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MCSymbolAttr Attr = StringSwitch<MCSymbolAttr>(Directive)
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.Case(".weak", MCSA_Weak)
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.Default(MCSA_Invalid);
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assert(Attr != MCSA_Invalid && "unexpected symbol attribute directive!");
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if (getLexer().isNot(AsmToken::EndOfStatement)) {
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for (;;) {
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StringRef Name;
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if (getParser().ParseIdentifier(Name))
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return TokError("expected identifier in directive");
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MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
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getStreamer().EmitSymbolAttribute(Sym, Attr);
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if (getLexer().is(AsmToken::EndOfStatement))
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break;
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("unexpected token in directive");
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Lex();
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}
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}
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Lex();
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return false;
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}
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bool COFFAsmParser::ParseSectionSwitch(StringRef Section,
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unsigned Characteristics,
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SectionKind Kind) {
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in section switching directive");
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Lex();
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getStreamer().SwitchSection(getContext().getCOFFSection(
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Section, Characteristics, Kind));
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return false;
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}
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bool COFFAsmParser::ParseDirectiveDef(StringRef, SMLoc) {
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StringRef SymbolName;
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if (getParser().ParseIdentifier(SymbolName))
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return TokError("expected identifier in directive");
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MCSymbol *Sym = getContext().GetOrCreateSymbol(SymbolName);
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getStreamer().BeginCOFFSymbolDef(Sym);
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Lex();
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return false;
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}
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bool COFFAsmParser::ParseDirectiveScl(StringRef, SMLoc) {
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int64_t SymbolStorageClass;
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if (getParser().ParseAbsoluteExpression(SymbolStorageClass))
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return true;
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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Lex();
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getStreamer().EmitCOFFSymbolStorageClass(SymbolStorageClass);
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return false;
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}
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bool COFFAsmParser::ParseDirectiveType(StringRef, SMLoc) {
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int64_t Type;
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if (getParser().ParseAbsoluteExpression(Type))
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return true;
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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Lex();
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getStreamer().EmitCOFFSymbolType(Type);
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return false;
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}
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bool COFFAsmParser::ParseDirectiveEndef(StringRef, SMLoc) {
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Lex();
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getStreamer().EndCOFFSymbolDef();
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return false;
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}
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bool COFFAsmParser::ParseDirectiveSecRel32(StringRef, SMLoc) {
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StringRef SymbolID;
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if (getParser().ParseIdentifier(SymbolID))
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return true;
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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MCSymbol *Symbol = getContext().GetOrCreateSymbol(SymbolID);
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Lex();
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getStreamer().EmitCOFFSecRel32(Symbol);
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return false;
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}
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bool COFFAsmParser::ParseSEHDirectiveStartProc(StringRef, SMLoc) {
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StringRef SymbolID;
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if (getParser().ParseIdentifier(SymbolID))
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return true;
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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MCSymbol *Symbol = getContext().GetOrCreateSymbol(SymbolID);
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Lex();
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getStreamer().EmitWin64EHStartProc(Symbol);
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return false;
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}
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bool COFFAsmParser::ParseSEHDirectiveEndProc(StringRef, SMLoc) {
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Lex();
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getStreamer().EmitWin64EHEndProc();
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return false;
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}
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bool COFFAsmParser::ParseSEHDirectiveStartChained(StringRef, SMLoc) {
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Lex();
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getStreamer().EmitWin64EHStartChained();
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return false;
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}
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bool COFFAsmParser::ParseSEHDirectiveEndChained(StringRef, SMLoc) {
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Lex();
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getStreamer().EmitWin64EHEndChained();
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return false;
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}
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bool COFFAsmParser::ParseSEHDirectiveHandler(StringRef, SMLoc) {
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StringRef SymbolID;
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if (getParser().ParseIdentifier(SymbolID))
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return true;
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("you must specify one or both of @unwind or @except");
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Lex();
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bool unwind = false, except = false;
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if (ParseAtUnwindOrAtExcept(unwind, except))
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return true;
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if (getLexer().is(AsmToken::Comma)) {
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Lex();
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if (ParseAtUnwindOrAtExcept(unwind, except))
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return true;
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}
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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MCSymbol *handler = getContext().GetOrCreateSymbol(SymbolID);
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Lex();
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getStreamer().EmitWin64EHHandler(handler, unwind, except);
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return false;
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}
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bool COFFAsmParser::ParseSEHDirectiveHandlerData(StringRef, SMLoc) {
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Lex();
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getStreamer().EmitWin64EHHandlerData();
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return false;
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}
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bool COFFAsmParser::ParseSEHDirectivePushReg(StringRef, SMLoc L) {
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unsigned Reg;
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if (ParseSEHRegisterNumber(Reg))
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return true;
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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Lex();
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getStreamer().EmitWin64EHPushReg(Reg);
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return false;
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}
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bool COFFAsmParser::ParseSEHDirectiveSetFrame(StringRef, SMLoc L) {
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unsigned Reg;
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int64_t Off;
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if (ParseSEHRegisterNumber(Reg))
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return true;
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("you must specify a stack pointer offset");
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Lex();
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SMLoc startLoc = getLexer().getLoc();
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if (getParser().ParseAbsoluteExpression(Off))
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return true;
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if (Off & 0x0F)
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return Error(startLoc, "offset is not a multiple of 16");
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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Lex();
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getStreamer().EmitWin64EHSetFrame(Reg, Off);
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return false;
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}
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bool COFFAsmParser::ParseSEHDirectiveAllocStack(StringRef, SMLoc) {
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int64_t Size;
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SMLoc startLoc = getLexer().getLoc();
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if (getParser().ParseAbsoluteExpression(Size))
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return true;
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if (Size & 7)
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return Error(startLoc, "size is not a multiple of 8");
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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Lex();
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getStreamer().EmitWin64EHAllocStack(Size);
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return false;
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}
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bool COFFAsmParser::ParseSEHDirectiveSaveReg(StringRef, SMLoc L) {
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unsigned Reg;
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int64_t Off;
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if (ParseSEHRegisterNumber(Reg))
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return true;
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("you must specify an offset on the stack");
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Lex();
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SMLoc startLoc = getLexer().getLoc();
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if (getParser().ParseAbsoluteExpression(Off))
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return true;
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if (Off & 7)
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return Error(startLoc, "size is not a multiple of 8");
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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Lex();
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// FIXME: Err on %xmm* registers
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getStreamer().EmitWin64EHSaveReg(Reg, Off);
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return false;
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}
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// FIXME: This method is inherently x86-specific. It should really be in the
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// x86 backend.
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bool COFFAsmParser::ParseSEHDirectiveSaveXMM(StringRef, SMLoc L) {
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unsigned Reg;
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int64_t Off;
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if (ParseSEHRegisterNumber(Reg))
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return true;
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("you must specify an offset on the stack");
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Lex();
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SMLoc startLoc = getLexer().getLoc();
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if (getParser().ParseAbsoluteExpression(Off))
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return true;
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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if (Off & 0x0F)
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return Error(startLoc, "offset is not a multiple of 16");
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Lex();
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// FIXME: Err on non-%xmm* registers
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getStreamer().EmitWin64EHSaveXMM(Reg, Off);
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return false;
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}
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bool COFFAsmParser::ParseSEHDirectivePushFrame(StringRef, SMLoc) {
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bool Code = false;
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StringRef CodeID;
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if (getLexer().is(AsmToken::At)) {
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SMLoc startLoc = getLexer().getLoc();
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Lex();
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if (!getParser().ParseIdentifier(CodeID)) {
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if (CodeID != "code")
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return Error(startLoc, "expected @code");
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Code = true;
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}
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}
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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Lex();
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getStreamer().EmitWin64EHPushFrame(Code);
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return false;
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}
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bool COFFAsmParser::ParseSEHDirectiveEndProlog(StringRef, SMLoc) {
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Lex();
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getStreamer().EmitWin64EHEndProlog();
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return false;
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}
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bool COFFAsmParser::ParseAtUnwindOrAtExcept(bool &unwind, bool &except) {
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StringRef identifier;
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if (getLexer().isNot(AsmToken::At))
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return TokError("a handler attribute must begin with '@'");
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SMLoc startLoc = getLexer().getLoc();
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Lex();
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if (getParser().ParseIdentifier(identifier))
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return Error(startLoc, "expected @unwind or @except");
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if (identifier == "unwind")
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unwind = true;
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else if (identifier == "except")
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except = true;
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else
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return Error(startLoc, "expected @unwind or @except");
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return false;
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}
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bool COFFAsmParser::ParseSEHRegisterNumber(unsigned &RegNo) {
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SMLoc startLoc = getLexer().getLoc();
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if (getLexer().is(AsmToken::Percent)) {
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const MCRegisterInfo &MRI = getContext().getRegisterInfo();
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SMLoc endLoc;
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unsigned LLVMRegNo;
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if (getParser().getTargetParser().ParseRegister(LLVMRegNo,startLoc,endLoc))
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return true;
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#if 0
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// FIXME: TargetAsmInfo::getCalleeSavedRegs() commits a serious layering
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// violation so this validation code is disabled.
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// Check that this is a non-volatile register.
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const unsigned *NVRegs = TAI.getCalleeSavedRegs();
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unsigned i;
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for (i = 0; NVRegs[i] != 0; ++i)
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if (NVRegs[i] == LLVMRegNo)
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break;
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if (NVRegs[i] == 0)
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return Error(startLoc, "expected non-volatile register");
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#endif
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int SEHRegNo = MRI.getSEHRegNum(LLVMRegNo);
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if (SEHRegNo < 0)
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return Error(startLoc,"register can't be represented in SEH unwind info");
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RegNo = SEHRegNo;
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}
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else {
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int64_t n;
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if (getParser().ParseAbsoluteExpression(n))
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return true;
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if (n > 15)
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return Error(startLoc, "register number is too high");
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RegNo = n;
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}
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return false;
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}
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namespace llvm {
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MCAsmParserExtension *createCOFFAsmParser() {
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return new COFFAsmParser;
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}
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}
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