mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-02-20 14:29:27 +00:00
622520e70f
Rename the routines to reflect the reality that they are more related to call frame information than to Win64 EH. Although EH is implemented in an intertwined manner by augmenting with an exception handler and an associated parameter, the majority of these routines emit information required to unwind the frames. This also helps identify that these routines are generic for most windows platforms (they apply equally to nearly all architectures except x86) although the encoding of the information is architecture dependent. Unwinding data is emitted via EmitWinCFI* and exception handling information via EmitWinEH*. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211994 91177308-0d34-0410-b5e6-96231b3b80d8
777 lines
24 KiB
C++
777 lines
24 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/MCExpr.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/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/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::*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 FlagsString, 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::ParseDirectiveSecIdx>(".secidx");
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addDirectiveHandler<&COFFAsmParser::ParseDirectiveLinkOnce>(".linkonce");
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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 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 parseCOMDATType(COFF::COMDATType &Type);
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bool ParseDirectiveLinkOnce(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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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::getDataRel();
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}
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bool COFFAsmParser::ParseSectionFlags(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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};
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bool ReadOnlyRemoved = false;
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unsigned SecFlags = None;
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for (unsigned i = 0; i < FlagsString.size(); ++i) {
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switch (FlagsString[i]) {
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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 '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 & 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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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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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: 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(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 (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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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::ParseDirectiveSecIdx(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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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().EmitCOFFSectionIndex(Symbol);
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return false;
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}
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/// ::= [ identifier ]
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bool COFFAsmParser::parseCOMDATType(COFF::COMDATType &Type) {
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StringRef TypeId = getTok().getIdentifier();
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Type = StringSwitch<COFF::COMDATType>(TypeId)
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.Case("one_only", COFF::IMAGE_COMDAT_SELECT_NODUPLICATES)
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.Case("discard", COFF::IMAGE_COMDAT_SELECT_ANY)
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.Case("same_size", COFF::IMAGE_COMDAT_SELECT_SAME_SIZE)
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.Case("same_contents", COFF::IMAGE_COMDAT_SELECT_EXACT_MATCH)
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.Case("associative", COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE)
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.Case("largest", COFF::IMAGE_COMDAT_SELECT_LARGEST)
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.Case("newest", COFF::IMAGE_COMDAT_SELECT_NEWEST)
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.Default((COFF::COMDATType)0);
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if (Type == 0)
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return TokError(Twine("unrecognized COMDAT type '" + TypeId + "'"));
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Lex();
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return false;
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}
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/// ParseDirectiveLinkOnce
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/// ::= .linkonce [ identifier ]
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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().getCurrentSection().first);
|
|
|
|
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) {
|
|
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);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectiveEndProc(StringRef, SMLoc) {
|
|
Lex();
|
|
getStreamer().EmitWinCFIEndProc();
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectiveStartChained(StringRef, SMLoc) {
|
|
Lex();
|
|
getStreamer().EmitWinCFIStartChained();
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectiveEndChained(StringRef, SMLoc) {
|
|
Lex();
|
|
getStreamer().EmitWinCFIEndChained();
|
|
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().EmitWinEHHandler(handler, unwind, except);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectiveHandlerData(StringRef, SMLoc) {
|
|
Lex();
|
|
getStreamer().EmitWinEHHandlerData();
|
|
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().EmitWinCFIPushReg(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().EmitWinCFISetFrame(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().EmitWinCFIAllocStack(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().EmitWinCFISaveReg(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().EmitWinCFISaveXMM(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().EmitWinCFIPushFrame(Code);
|
|
return false;
|
|
}
|
|
|
|
bool COFFAsmParser::ParseSEHDirectiveEndProlog(StringRef, SMLoc) {
|
|
Lex();
|
|
getStreamer().EmitWinCFIEndProlog();
|
|
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;
|
|
}
|
|
|
|
}
|