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866 lines
27 KiB
C++
866 lines
27 KiB
C++
//===- COFFAsmParser.cpp - COFF Assembly Parser ---------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/BinaryFormat/COFF.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCDirectives.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCParser/MCAsmLexer.h"
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#include "llvm/MC/MCParser/MCAsmParserExtension.h"
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#include "llvm/MC/MCParser/MCTargetAsmParser.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/SectionKind.h"
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#include "llvm/Support/SMLoc.h"
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#include <cassert>
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#include <cstdint>
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#include <limits>
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#include <utility>
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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::*HandlerMethod)(StringRef, SMLoc)>
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void addDirectiveHandler(StringRef Directive) {
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MCAsmParser::ExtensionDirectiveHandler Handler = std::make_pair(
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this, HandleDirective<COFFAsmParser, HandlerMethod>);
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getParser().addDirectiveHandler(Directive, 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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bool ParseSectionSwitch(StringRef Section, unsigned Characteristics,
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SectionKind Kind, StringRef COMDATSymName,
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COFF::COMDATType Type);
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bool ParseSectionName(StringRef &SectionName);
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bool ParseSectionFlags(StringRef SectionName, StringRef FlagsString,
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unsigned *Flags);
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void Initialize(MCAsmParser &Parser) override {
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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::ParseDirectiveSection>(".section");
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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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addDirectiveHandler<&COFFAsmParser::ParseDirectiveSymIdx>(".symidx");
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addDirectiveHandler<&COFFAsmParser::ParseDirectiveSafeSEH>(".safeseh");
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addDirectiveHandler<&COFFAsmParser::ParseDirectiveSecIdx>(".secidx");
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addDirectiveHandler<&COFFAsmParser::ParseDirectiveLinkOnce>(".linkonce");
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addDirectiveHandler<&COFFAsmParser::ParseDirectiveRVA>(".rva");
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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", 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::getData());
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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 ParseDirectiveSection(StringRef, SMLoc);
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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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bool ParseDirectiveSecIdx(StringRef, SMLoc);
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bool ParseDirectiveSafeSEH(StringRef, SMLoc);
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bool ParseDirectiveSymIdx(StringRef, SMLoc);
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bool parseCOMDATType(COFF::COMDATType &Type);
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bool ParseDirectiveLinkOnce(StringRef, SMLoc);
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bool ParseDirectiveRVA(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() = default;
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};
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} // end annonomous namespace.
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static SectionKind computeSectionKind(unsigned Flags) {
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if (Flags & COFF::IMAGE_SCN_MEM_EXECUTE)
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return SectionKind::getText();
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if (Flags & COFF::IMAGE_SCN_MEM_READ &&
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(Flags & COFF::IMAGE_SCN_MEM_WRITE) == 0)
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return SectionKind::getReadOnly();
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return SectionKind::getData();
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}
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bool COFFAsmParser::ParseSectionFlags(StringRef SectionName,
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StringRef FlagsString, unsigned *Flags) {
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enum {
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None = 0,
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Alloc = 1 << 0,
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Code = 1 << 1,
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Load = 1 << 2,
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InitData = 1 << 3,
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Shared = 1 << 4,
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NoLoad = 1 << 5,
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NoRead = 1 << 6,
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NoWrite = 1 << 7,
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Discardable = 1 << 8,
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};
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bool ReadOnlyRemoved = false;
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unsigned SecFlags = None;
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for (char FlagChar : FlagsString) {
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switch (FlagChar) {
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case 'a':
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// Ignored.
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break;
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case 'b': // bss section
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SecFlags |= Alloc;
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if (SecFlags & InitData)
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return TokError("conflicting section flags 'b' and 'd'.");
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SecFlags &= ~Load;
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break;
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case 'd': // data section
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SecFlags |= InitData;
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if (SecFlags & Alloc)
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return TokError("conflicting section flags 'b' and 'd'.");
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SecFlags &= ~NoWrite;
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if ((SecFlags & NoLoad) == 0)
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SecFlags |= Load;
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break;
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case 'n': // section is not loaded
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SecFlags |= NoLoad;
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SecFlags &= ~Load;
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break;
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case 'D': // discardable
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SecFlags |= Discardable;
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break;
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case 'r': // read-only
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ReadOnlyRemoved = false;
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SecFlags |= NoWrite;
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if ((SecFlags & Code) == 0)
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SecFlags |= InitData;
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if ((SecFlags & NoLoad) == 0)
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SecFlags |= Load;
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break;
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case 's': // shared section
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SecFlags |= Shared | InitData;
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SecFlags &= ~NoWrite;
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if ((SecFlags & NoLoad) == 0)
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SecFlags |= Load;
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break;
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case 'w': // writable
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SecFlags &= ~NoWrite;
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ReadOnlyRemoved = true;
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break;
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case 'x': // executable section
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SecFlags |= Code;
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if ((SecFlags & NoLoad) == 0)
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SecFlags |= Load;
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if (!ReadOnlyRemoved)
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SecFlags |= NoWrite;
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break;
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case 'y': // not readable
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SecFlags |= NoRead | NoWrite;
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break;
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default:
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return TokError("unknown flag");
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}
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}
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*Flags = 0;
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if (SecFlags == None)
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SecFlags = InitData;
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if (SecFlags & Code)
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*Flags |= COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE;
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if (SecFlags & InitData)
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*Flags |= COFF::IMAGE_SCN_CNT_INITIALIZED_DATA;
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if ((SecFlags & Alloc) && (SecFlags & Load) == 0)
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*Flags |= COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
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if (SecFlags & NoLoad)
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*Flags |= COFF::IMAGE_SCN_LNK_REMOVE;
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if ((SecFlags & Discardable) ||
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MCSectionCOFF::isImplicitlyDiscardable(SectionName))
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*Flags |= COFF::IMAGE_SCN_MEM_DISCARDABLE;
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if ((SecFlags & NoRead) == 0)
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*Flags |= COFF::IMAGE_SCN_MEM_READ;
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if ((SecFlags & NoWrite) == 0)
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*Flags |= COFF::IMAGE_SCN_MEM_WRITE;
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if (SecFlags & Shared)
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*Flags |= COFF::IMAGE_SCN_MEM_SHARED;
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return false;
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}
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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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while (true) {
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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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return ParseSectionSwitch(Section, Characteristics, Kind, "", (COFF::COMDATType)0);
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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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StringRef COMDATSymName,
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COFF::COMDATType Type) {
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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, COMDATSymName, Type));
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return false;
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}
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bool COFFAsmParser::ParseSectionName(StringRef &SectionName) {
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if (!getLexer().is(AsmToken::Identifier))
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return true;
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SectionName = getTok().getIdentifier();
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Lex();
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return false;
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}
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// .section name [, "flags"] [, identifier [ identifier ], identifier]
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//
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// Supported flags:
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// a: Ignored.
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// b: BSS section (uninitialized data)
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// d: data section (initialized data)
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// n: "noload" section (removed by linker)
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// D: Discardable section
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// r: Readable section
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// s: Shared section
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// w: Writable section
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// x: Executable section
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// y: Not-readable section (clears 'r')
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//
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// Subsections are not supported.
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bool COFFAsmParser::ParseDirectiveSection(StringRef, SMLoc) {
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StringRef SectionName;
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if (ParseSectionName(SectionName))
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return TokError("expected identifier in directive");
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unsigned Flags = 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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if (getLexer().is(AsmToken::Comma)) {
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Lex();
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if (getLexer().isNot(AsmToken::String))
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return TokError("expected string in directive");
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StringRef FlagsStr = getTok().getStringContents();
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Lex();
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if (ParseSectionFlags(SectionName, FlagsStr, &Flags))
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return true;
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}
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COFF::COMDATType Type = (COFF::COMDATType)0;
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StringRef COMDATSymName;
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if (getLexer().is(AsmToken::Comma)) {
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Type = COFF::IMAGE_COMDAT_SELECT_ANY;
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Lex();
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Flags |= COFF::IMAGE_SCN_LNK_COMDAT;
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if (!getLexer().is(AsmToken::Identifier))
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return TokError("expected comdat type such as 'discard' or 'largest' "
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"after protection bits");
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if (parseCOMDATType(Type))
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return true;
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("expected comma in directive");
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Lex();
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if (getParser().parseIdentifier(COMDATSymName))
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return TokError("expected identifier in directive");
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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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SectionKind Kind = computeSectionKind(Flags);
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if (Kind.isText()) {
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const Triple &T = getContext().getObjectFileInfo()->getTargetTriple();
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if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb)
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Flags |= COFF::IMAGE_SCN_MEM_16BIT;
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}
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ParseSectionSwitch(SectionName, Flags, Kind, COMDATSymName, Type);
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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 TokError("expected identifier in directive");
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int64_t Offset = 0;
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SMLoc OffsetLoc;
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if (getLexer().is(AsmToken::Plus)) {
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OffsetLoc = getLexer().getLoc();
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if (getParser().parseAbsoluteExpression(Offset))
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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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if (Offset < 0 || Offset > std::numeric_limits<uint32_t>::max())
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return Error(
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OffsetLoc,
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"invalid '.secrel32' directive offset, can't be less "
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"than zero or greater than std::numeric_limits<uint32_t>::max()");
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MCSymbol *Symbol = getContext().getOrCreateSymbol(SymbolID);
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|
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Lex();
|
|
getStreamer().EmitCOFFSecRel32(Symbol, Offset);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseDirectiveRVA(StringRef, SMLoc) {
|
|
auto parseOp = [&]() -> bool {
|
|
StringRef SymbolID;
|
|
if (getParser().parseIdentifier(SymbolID))
|
|
return TokError("expected identifier in directive");
|
|
|
|
int64_t Offset = 0;
|
|
SMLoc OffsetLoc;
|
|
if (getLexer().is(AsmToken::Plus) || getLexer().is(AsmToken::Minus)) {
|
|
OffsetLoc = getLexer().getLoc();
|
|
if (getParser().parseAbsoluteExpression(Offset))
|
|
return true;
|
|
}
|
|
|
|
if (Offset < std::numeric_limits<int32_t>::min() ||
|
|
Offset > std::numeric_limits<int32_t>::max())
|
|
return Error(OffsetLoc, "invalid '.rva' directive offset, can't be less "
|
|
"than -2147483648 or greater than "
|
|
"2147483647");
|
|
|
|
MCSymbol *Symbol = getContext().getOrCreateSymbol(SymbolID);
|
|
|
|
getStreamer().EmitCOFFImgRel32(Symbol, Offset);
|
|
return false;
|
|
};
|
|
|
|
if (getParser().parseMany(parseOp))
|
|
return addErrorSuffix(" in directive");
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseDirectiveSafeSEH(StringRef, SMLoc) {
|
|
StringRef SymbolID;
|
|
if (getParser().parseIdentifier(SymbolID))
|
|
return TokError("expected identifier in directive");
|
|
|
|
if (getLexer().isNot(AsmToken::EndOfStatement))
|
|
return TokError("unexpected token in directive");
|
|
|
|
MCSymbol *Symbol = getContext().getOrCreateSymbol(SymbolID);
|
|
|
|
Lex();
|
|
getStreamer().EmitCOFFSafeSEH(Symbol);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseDirectiveSecIdx(StringRef, SMLoc) {
|
|
StringRef SymbolID;
|
|
if (getParser().parseIdentifier(SymbolID))
|
|
return TokError("expected identifier in directive");
|
|
|
|
if (getLexer().isNot(AsmToken::EndOfStatement))
|
|
return TokError("unexpected token in directive");
|
|
|
|
MCSymbol *Symbol = getContext().getOrCreateSymbol(SymbolID);
|
|
|
|
Lex();
|
|
getStreamer().EmitCOFFSectionIndex(Symbol);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseDirectiveSymIdx(StringRef, SMLoc) {
|
|
StringRef SymbolID;
|
|
if (getParser().parseIdentifier(SymbolID))
|
|
return TokError("expected identifier in directive");
|
|
|
|
if (getLexer().isNot(AsmToken::EndOfStatement))
|
|
return TokError("unexpected token in directive");
|
|
|
|
MCSymbol *Symbol = getContext().getOrCreateSymbol(SymbolID);
|
|
|
|
Lex();
|
|
getStreamer().EmitCOFFSymbolIndex(Symbol);
|
|
return false;
|
|
}
|
|
|
|
/// ::= [ identifier ]
|
|
bool COFFAsmParser::parseCOMDATType(COFF::COMDATType &Type) {
|
|
StringRef TypeId = getTok().getIdentifier();
|
|
|
|
Type = StringSwitch<COFF::COMDATType>(TypeId)
|
|
.Case("one_only", COFF::IMAGE_COMDAT_SELECT_NODUPLICATES)
|
|
.Case("discard", COFF::IMAGE_COMDAT_SELECT_ANY)
|
|
.Case("same_size", COFF::IMAGE_COMDAT_SELECT_SAME_SIZE)
|
|
.Case("same_contents", COFF::IMAGE_COMDAT_SELECT_EXACT_MATCH)
|
|
.Case("associative", COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE)
|
|
.Case("largest", COFF::IMAGE_COMDAT_SELECT_LARGEST)
|
|
.Case("newest", COFF::IMAGE_COMDAT_SELECT_NEWEST)
|
|
.Default((COFF::COMDATType)0);
|
|
|
|
if (Type == 0)
|
|
return TokError(Twine("unrecognized COMDAT type '" + TypeId + "'"));
|
|
|
|
Lex();
|
|
|
|
return false;
|
|
}
|
|
|
|
/// ParseDirectiveLinkOnce
|
|
/// ::= .linkonce [ identifier ]
|
|
bool COFFAsmParser::ParseDirectiveLinkOnce(StringRef, SMLoc Loc) {
|
|
COFF::COMDATType Type = COFF::IMAGE_COMDAT_SELECT_ANY;
|
|
if (getLexer().is(AsmToken::Identifier))
|
|
if (parseCOMDATType(Type))
|
|
return true;
|
|
|
|
const MCSectionCOFF *Current =
|
|
static_cast<const MCSectionCOFF *>(getStreamer().getCurrentSectionOnly());
|
|
|
|
if (Type == COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE)
|
|
return Error(Loc, "cannot make section associative with .linkonce");
|
|
|
|
if (Current->getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT)
|
|
return Error(Loc, Twine("section '") + Current->getSectionName() +
|
|
"' is already linkonce");
|
|
|
|
Current->setSelection(Type);
|
|
|
|
if (getLexer().isNot(AsmToken::EndOfStatement))
|
|
return TokError("unexpected token in directive");
|
|
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectiveStartProc(StringRef, SMLoc Loc) {
|
|
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().EmitWinCFIStartProc(Symbol, Loc);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectiveEndProc(StringRef, SMLoc Loc) {
|
|
Lex();
|
|
getStreamer().EmitWinCFIEndProc(Loc);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectiveStartChained(StringRef, SMLoc Loc) {
|
|
Lex();
|
|
getStreamer().EmitWinCFIStartChained(Loc);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectiveEndChained(StringRef, SMLoc Loc) {
|
|
Lex();
|
|
getStreamer().EmitWinCFIEndChained(Loc);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectiveHandler(StringRef, SMLoc Loc) {
|
|
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().EmitWinEHHandler(handler, unwind, except, Loc);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectiveHandlerData(StringRef, SMLoc Loc) {
|
|
Lex();
|
|
getStreamer().EmitWinEHHandlerData();
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectivePushReg(StringRef, SMLoc Loc) {
|
|
unsigned Reg = 0;
|
|
if (ParseSEHRegisterNumber(Reg))
|
|
return true;
|
|
|
|
if (getLexer().isNot(AsmToken::EndOfStatement))
|
|
return TokError("unexpected token in directive");
|
|
|
|
Lex();
|
|
getStreamer().EmitWinCFIPushReg(Reg, Loc);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectiveSetFrame(StringRef, SMLoc Loc) {
|
|
unsigned Reg = 0;
|
|
int64_t Off;
|
|
if (ParseSEHRegisterNumber(Reg))
|
|
return true;
|
|
if (getLexer().isNot(AsmToken::Comma))
|
|
return TokError("you must specify a stack pointer offset");
|
|
|
|
Lex();
|
|
if (getParser().parseAbsoluteExpression(Off))
|
|
return true;
|
|
|
|
if (getLexer().isNot(AsmToken::EndOfStatement))
|
|
return TokError("unexpected token in directive");
|
|
|
|
Lex();
|
|
getStreamer().EmitWinCFISetFrame(Reg, Off, Loc);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectiveAllocStack(StringRef, SMLoc Loc) {
|
|
int64_t Size;
|
|
if (getParser().parseAbsoluteExpression(Size))
|
|
return true;
|
|
|
|
if (getLexer().isNot(AsmToken::EndOfStatement))
|
|
return TokError("unexpected token in directive");
|
|
|
|
Lex();
|
|
getStreamer().EmitWinCFIAllocStack(Size, Loc);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectiveSaveReg(StringRef, SMLoc Loc) {
|
|
unsigned Reg = 0;
|
|
int64_t Off;
|
|
if (ParseSEHRegisterNumber(Reg))
|
|
return true;
|
|
if (getLexer().isNot(AsmToken::Comma))
|
|
return TokError("you must specify an offset on the stack");
|
|
|
|
Lex();
|
|
if (getParser().parseAbsoluteExpression(Off))
|
|
return true;
|
|
|
|
if (getLexer().isNot(AsmToken::EndOfStatement))
|
|
return TokError("unexpected token in directive");
|
|
|
|
Lex();
|
|
// FIXME: Err on %xmm* registers
|
|
getStreamer().EmitWinCFISaveReg(Reg, Off, Loc);
|
|
return false;
|
|
}
|
|
|
|
// FIXME: This method is inherently x86-specific. It should really be in the
|
|
// x86 backend.
|
|
bool COFFAsmParser::ParseSEHDirectiveSaveXMM(StringRef, SMLoc Loc) {
|
|
unsigned Reg = 0;
|
|
int64_t Off;
|
|
if (ParseSEHRegisterNumber(Reg))
|
|
return true;
|
|
if (getLexer().isNot(AsmToken::Comma))
|
|
return TokError("you must specify an offset on the stack");
|
|
|
|
Lex();
|
|
if (getParser().parseAbsoluteExpression(Off))
|
|
return true;
|
|
|
|
if (getLexer().isNot(AsmToken::EndOfStatement))
|
|
return TokError("unexpected token in directive");
|
|
|
|
Lex();
|
|
// FIXME: Err on non-%xmm* registers
|
|
getStreamer().EmitWinCFISaveXMM(Reg, Off, Loc);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectivePushFrame(StringRef, SMLoc Loc) {
|
|
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().EmitWinCFIPushFrame(Code, Loc);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectiveEndProlog(StringRef, SMLoc Loc) {
|
|
Lex();
|
|
getStreamer().EmitWinCFIEndProlog(Loc);
|
|
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;
|
|
}
|
|
|
|
} // end namespace llvm
|