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DarwinAsmParser.cpp
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//===- DarwinAsmParser.cpp - Darwin (Mach-O) Assembly Parser --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Triple.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/MachO.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDirectives.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCParser/MCAsmLexer.h"
#include "llvm/MC/MCParser/MCAsmParser.h"
#include "llvm/MC/MCParser/MCAsmParserExtension.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/SectionKind.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SMLoc.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <string>
#include <system_error>
#include <utility>
using namespace llvm;
namespace {
/// Implementation of directive handling which is shared across all
/// Darwin targets.
class DarwinAsmParser : public MCAsmParserExtension {
template<bool (DarwinAsmParser::*HandlerMethod)(StringRef, SMLoc)>
void addDirectiveHandler(StringRef Directive) {
MCAsmParser::ExtensionDirectiveHandler Handler = std::make_pair(
this, HandleDirective<DarwinAsmParser, HandlerMethod>);
getParser().addDirectiveHandler(Directive, Handler);
}
bool parseSectionSwitch(StringRef Segment, StringRef Section,
unsigned TAA = 0, unsigned ImplicitAlign = 0,
unsigned StubSize = 0);
SMLoc LastVersionDirective;
public:
DarwinAsmParser() = default;
void Initialize(MCAsmParser &Parser) override {
// Call the base implementation.
this->MCAsmParserExtension::Initialize(Parser);
addDirectiveHandler<&DarwinAsmParser::parseDirectiveAltEntry>(".alt_entry");
addDirectiveHandler<&DarwinAsmParser::parseDirectiveDesc>(".desc");
addDirectiveHandler<&DarwinAsmParser::parseDirectiveIndirectSymbol>(
".indirect_symbol");
addDirectiveHandler<&DarwinAsmParser::parseDirectiveLsym>(".lsym");
addDirectiveHandler<&DarwinAsmParser::parseDirectiveSubsectionsViaSymbols>(
".subsections_via_symbols");
addDirectiveHandler<&DarwinAsmParser::parseDirectiveDumpOrLoad>(".dump");
addDirectiveHandler<&DarwinAsmParser::parseDirectiveDumpOrLoad>(".load");
addDirectiveHandler<&DarwinAsmParser::parseDirectiveSection>(".section");
addDirectiveHandler<&DarwinAsmParser::parseDirectivePushSection>(
".pushsection");
addDirectiveHandler<&DarwinAsmParser::parseDirectivePopSection>(
".popsection");
addDirectiveHandler<&DarwinAsmParser::parseDirectivePrevious>(".previous");
addDirectiveHandler<&DarwinAsmParser::parseDirectiveSecureLogUnique>(
".secure_log_unique");
addDirectiveHandler<&DarwinAsmParser::parseDirectiveSecureLogReset>(
".secure_log_reset");
addDirectiveHandler<&DarwinAsmParser::parseDirectiveTBSS>(".tbss");
addDirectiveHandler<&DarwinAsmParser::parseDirectiveZerofill>(".zerofill");
addDirectiveHandler<&DarwinAsmParser::parseDirectiveDataRegion>(
".data_region");
addDirectiveHandler<&DarwinAsmParser::parseDirectiveDataRegionEnd>(
".end_data_region");
// Special section directives.
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveBss>(".bss");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveConst>(".const");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveConstData>(
".const_data");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveConstructor>(
".constructor");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveCString>(
".cstring");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveData>(".data");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveDestructor>(
".destructor");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveDyld>(".dyld");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveFVMLibInit0>(
".fvmlib_init0");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveFVMLibInit1>(
".fvmlib_init1");
addDirectiveHandler<
&DarwinAsmParser::parseSectionDirectiveLazySymbolPointers>(
".lazy_symbol_pointer");
addDirectiveHandler<&DarwinAsmParser::parseDirectiveLinkerOption>(
".linker_option");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveLiteral16>(
".literal16");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveLiteral4>(
".literal4");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveLiteral8>(
".literal8");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveModInitFunc>(
".mod_init_func");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveModTermFunc>(
".mod_term_func");
addDirectiveHandler<
&DarwinAsmParser::parseSectionDirectiveNonLazySymbolPointers>(
".non_lazy_symbol_pointer");
addDirectiveHandler<
&DarwinAsmParser::parseSectionDirectiveThreadLocalVariablePointers>(
".thread_local_variable_pointer");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCCatClsMeth>(
".objc_cat_cls_meth");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCCatInstMeth>(
".objc_cat_inst_meth");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCCategory>(
".objc_category");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClass>(
".objc_class");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClassNames>(
".objc_class_names");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClassVars>(
".objc_class_vars");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClsMeth>(
".objc_cls_meth");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClsRefs>(
".objc_cls_refs");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCInstMeth>(
".objc_inst_meth");
addDirectiveHandler<
&DarwinAsmParser::parseSectionDirectiveObjCInstanceVars>(
".objc_instance_vars");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCMessageRefs>(
".objc_message_refs");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCMetaClass>(
".objc_meta_class");
addDirectiveHandler<
&DarwinAsmParser::parseSectionDirectiveObjCMethVarNames>(
".objc_meth_var_names");
addDirectiveHandler<
&DarwinAsmParser::parseSectionDirectiveObjCMethVarTypes>(
".objc_meth_var_types");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCModuleInfo>(
".objc_module_info");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCProtocol>(
".objc_protocol");
addDirectiveHandler<
&DarwinAsmParser::parseSectionDirectiveObjCSelectorStrs>(
".objc_selector_strs");
addDirectiveHandler<
&DarwinAsmParser::parseSectionDirectiveObjCStringObject>(
".objc_string_object");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCSymbols>(
".objc_symbols");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectivePICSymbolStub>(
".picsymbol_stub");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveStaticConst>(
".static_const");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveStaticData>(
".static_data");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveSymbolStub>(
".symbol_stub");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveTData>(".tdata");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveText>(".text");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveThreadInitFunc>(
".thread_init_func");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveTLV>(".tlv");
addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveIdent>(".ident");
addDirectiveHandler<&DarwinAsmParser::parseWatchOSVersionMin>(
".watchos_version_min");
addDirectiveHandler<&DarwinAsmParser::parseTvOSVersionMin>(
".tvos_version_min");
addDirectiveHandler<&DarwinAsmParser::parseIOSVersionMin>(
".ios_version_min");
addDirectiveHandler<&DarwinAsmParser::parseMacOSXVersionMin>(
".macosx_version_min");
addDirectiveHandler<&DarwinAsmParser::parseBuildVersion>(".build_version");
LastVersionDirective = SMLoc();
}
bool parseDirectiveAltEntry(StringRef, SMLoc);
bool parseDirectiveDesc(StringRef, SMLoc);
bool parseDirectiveIndirectSymbol(StringRef, SMLoc);
bool parseDirectiveDumpOrLoad(StringRef, SMLoc);
bool parseDirectiveLsym(StringRef, SMLoc);
bool parseDirectiveLinkerOption(StringRef, SMLoc);
bool parseDirectiveSection(StringRef, SMLoc);
bool parseDirectivePushSection(StringRef, SMLoc);
bool parseDirectivePopSection(StringRef, SMLoc);
bool parseDirectivePrevious(StringRef, SMLoc);
bool parseDirectiveSecureLogReset(StringRef, SMLoc);
bool parseDirectiveSecureLogUnique(StringRef, SMLoc);
bool parseDirectiveSubsectionsViaSymbols(StringRef, SMLoc);
bool parseDirectiveTBSS(StringRef, SMLoc);
bool parseDirectiveZerofill(StringRef, SMLoc);
bool parseDirectiveDataRegion(StringRef, SMLoc);
bool parseDirectiveDataRegionEnd(StringRef, SMLoc);
// Named Section Directive
bool parseSectionDirectiveBss(StringRef, SMLoc) {
return parseSectionSwitch("__DATA", "__bss");
}
bool parseSectionDirectiveConst(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT", "__const");
}
bool parseSectionDirectiveStaticConst(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT", "__static_const");
}
bool parseSectionDirectiveCString(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT","__cstring",
MachO::S_CSTRING_LITERALS);
}
bool parseSectionDirectiveLiteral4(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT", "__literal4",
MachO::S_4BYTE_LITERALS, 4);
}
bool parseSectionDirectiveLiteral8(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT", "__literal8",
MachO::S_8BYTE_LITERALS, 8);
}
bool parseSectionDirectiveLiteral16(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT","__literal16",
MachO::S_16BYTE_LITERALS, 16);
}
bool parseSectionDirectiveConstructor(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT","__constructor");
}
bool parseSectionDirectiveDestructor(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT","__destructor");
}
bool parseSectionDirectiveFVMLibInit0(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT","__fvmlib_init0");
}
bool parseSectionDirectiveFVMLibInit1(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT","__fvmlib_init1");
}
bool parseSectionDirectiveSymbolStub(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT","__symbol_stub",
MachO::S_SYMBOL_STUBS |
MachO::S_ATTR_PURE_INSTRUCTIONS,
// FIXME: Different on PPC and ARM.
0, 16);
}
bool parseSectionDirectivePICSymbolStub(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT","__picsymbol_stub",
MachO::S_SYMBOL_STUBS |
MachO::S_ATTR_PURE_INSTRUCTIONS, 0, 26);
}
bool parseSectionDirectiveData(StringRef, SMLoc) {
return parseSectionSwitch("__DATA", "__data");
}
bool parseSectionDirectiveStaticData(StringRef, SMLoc) {
return parseSectionSwitch("__DATA", "__static_data");
}
bool parseSectionDirectiveNonLazySymbolPointers(StringRef, SMLoc) {
return parseSectionSwitch("__DATA", "__nl_symbol_ptr",
MachO::S_NON_LAZY_SYMBOL_POINTERS, 4);
}
bool parseSectionDirectiveLazySymbolPointers(StringRef, SMLoc) {
return parseSectionSwitch("__DATA", "__la_symbol_ptr",
MachO::S_LAZY_SYMBOL_POINTERS, 4);
}
bool parseSectionDirectiveThreadLocalVariablePointers(StringRef, SMLoc) {
return parseSectionSwitch("__DATA", "__thread_ptr",
MachO::S_THREAD_LOCAL_VARIABLE_POINTERS, 4);
}
bool parseSectionDirectiveDyld(StringRef, SMLoc) {
return parseSectionSwitch("__DATA", "__dyld");
}
bool parseSectionDirectiveModInitFunc(StringRef, SMLoc) {
return parseSectionSwitch("__DATA", "__mod_init_func",
MachO::S_MOD_INIT_FUNC_POINTERS, 4);
}
bool parseSectionDirectiveModTermFunc(StringRef, SMLoc) {
return parseSectionSwitch("__DATA", "__mod_term_func",
MachO::S_MOD_TERM_FUNC_POINTERS, 4);
}
bool parseSectionDirectiveConstData(StringRef, SMLoc) {
return parseSectionSwitch("__DATA", "__const");
}
bool parseSectionDirectiveObjCClass(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__class",
MachO::S_ATTR_NO_DEAD_STRIP);
}
bool parseSectionDirectiveObjCMetaClass(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__meta_class",
MachO::S_ATTR_NO_DEAD_STRIP);
}
bool parseSectionDirectiveObjCCatClsMeth(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__cat_cls_meth",
MachO::S_ATTR_NO_DEAD_STRIP);
}
bool parseSectionDirectiveObjCCatInstMeth(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__cat_inst_meth",
MachO::S_ATTR_NO_DEAD_STRIP);
}
bool parseSectionDirectiveObjCProtocol(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__protocol",
MachO::S_ATTR_NO_DEAD_STRIP);
}
bool parseSectionDirectiveObjCStringObject(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__string_object",
MachO::S_ATTR_NO_DEAD_STRIP);
}
bool parseSectionDirectiveObjCClsMeth(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__cls_meth",
MachO::S_ATTR_NO_DEAD_STRIP);
}
bool parseSectionDirectiveObjCInstMeth(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__inst_meth",
MachO::S_ATTR_NO_DEAD_STRIP);
}
bool parseSectionDirectiveObjCClsRefs(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__cls_refs",
MachO::S_ATTR_NO_DEAD_STRIP |
MachO::S_LITERAL_POINTERS, 4);
}
bool parseSectionDirectiveObjCMessageRefs(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__message_refs",
MachO::S_ATTR_NO_DEAD_STRIP |
MachO::S_LITERAL_POINTERS, 4);
}
bool parseSectionDirectiveObjCSymbols(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__symbols",
MachO::S_ATTR_NO_DEAD_STRIP);
}
bool parseSectionDirectiveObjCCategory(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__category",
MachO::S_ATTR_NO_DEAD_STRIP);
}
bool parseSectionDirectiveObjCClassVars(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__class_vars",
MachO::S_ATTR_NO_DEAD_STRIP);
}
bool parseSectionDirectiveObjCInstanceVars(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__instance_vars",
MachO::S_ATTR_NO_DEAD_STRIP);
}
bool parseSectionDirectiveObjCModuleInfo(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__module_info",
MachO::S_ATTR_NO_DEAD_STRIP);
}
bool parseSectionDirectiveObjCClassNames(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT", "__cstring",
MachO::S_CSTRING_LITERALS);
}
bool parseSectionDirectiveObjCMethVarTypes(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT", "__cstring",
MachO::S_CSTRING_LITERALS);
}
bool parseSectionDirectiveObjCMethVarNames(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT", "__cstring",
MachO::S_CSTRING_LITERALS);
}
bool parseSectionDirectiveObjCSelectorStrs(StringRef, SMLoc) {
return parseSectionSwitch("__OBJC", "__selector_strs",
MachO::S_CSTRING_LITERALS);
}
bool parseSectionDirectiveTData(StringRef, SMLoc) {
return parseSectionSwitch("__DATA", "__thread_data",
MachO::S_THREAD_LOCAL_REGULAR);
}
bool parseSectionDirectiveText(StringRef, SMLoc) {
return parseSectionSwitch("__TEXT", "__text",
MachO::S_ATTR_PURE_INSTRUCTIONS);
}
bool parseSectionDirectiveTLV(StringRef, SMLoc) {
return parseSectionSwitch("__DATA", "__thread_vars",
MachO::S_THREAD_LOCAL_VARIABLES);
}
bool parseSectionDirectiveIdent(StringRef, SMLoc) {
// Darwin silently ignores the .ident directive.
getParser().eatToEndOfStatement();
return false;
}
bool parseSectionDirectiveThreadInitFunc(StringRef, SMLoc) {
return parseSectionSwitch("__DATA", "__thread_init",
MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS);
}
bool parseWatchOSVersionMin(StringRef Directive, SMLoc Loc) {
return parseVersionMin(Directive, Loc, MCVM_WatchOSVersionMin);
}
bool parseTvOSVersionMin(StringRef Directive, SMLoc Loc) {
return parseVersionMin(Directive, Loc, MCVM_TvOSVersionMin);
}
bool parseIOSVersionMin(StringRef Directive, SMLoc Loc) {
return parseVersionMin(Directive, Loc, MCVM_IOSVersionMin);
}
bool parseMacOSXVersionMin(StringRef Directive, SMLoc Loc) {
return parseVersionMin(Directive, Loc, MCVM_OSXVersionMin);
}
bool parseBuildVersion(StringRef Directive, SMLoc Loc);
bool parseVersionMin(StringRef Directive, SMLoc Loc, MCVersionMinType Type);
bool parseMajorMinorVersionComponent(unsigned *Major, unsigned *Minor,
const char *VersionName);
bool parseOptionalTrailingVersionComponent(unsigned *Component,
const char *ComponentName);
bool parseVersion(unsigned *Major, unsigned *Minor, unsigned *Update);
bool parseSDKVersion(VersionTuple &SDKVersion);
void checkVersion(StringRef Directive, StringRef Arg, SMLoc Loc,
Triple::OSType ExpectedOS);
};
} // end anonymous namespace
bool DarwinAsmParser::parseSectionSwitch(StringRef Segment, StringRef Section,
unsigned TAA, unsigned Align,
unsigned StubSize) {
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in section switching directive");
Lex();
// FIXME: Arch specific.
bool isText = TAA & MachO::S_ATTR_PURE_INSTRUCTIONS;
getStreamer().SwitchSection(getContext().getMachOSection(
Segment, Section, TAA, StubSize,
isText ? SectionKind::getText() : SectionKind::getData()));
// Set the implicit alignment, if any.
//
// FIXME: This isn't really what 'as' does; I think it just uses the implicit
// alignment on the section (e.g., if one manually inserts bytes into the
// section, then just issuing the section switch directive will not realign
// the section. However, this is arguably more reasonable behavior, and there
// is no good reason for someone to intentionally emit incorrectly sized
// values into the implicitly aligned sections.
if (Align)
getStreamer().emitValueToAlignment(Align);
return false;
}
/// parseDirectiveAltEntry
/// ::= .alt_entry identifier
bool DarwinAsmParser::parseDirectiveAltEntry(StringRef, SMLoc) {
StringRef Name;
if (getParser().parseIdentifier(Name))
return TokError("expected identifier in directive");
// Look up symbol.
MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
if (Sym->isDefined())
return TokError(".alt_entry must preceed symbol definition");
if (!getStreamer().emitSymbolAttribute(Sym, MCSA_AltEntry))
return TokError("unable to emit symbol attribute");
Lex();
return false;
}
/// parseDirectiveDesc
/// ::= .desc identifier , expression
bool DarwinAsmParser::parseDirectiveDesc(StringRef, SMLoc) {
StringRef Name;
if (getParser().parseIdentifier(Name))
return TokError("expected identifier in directive");
// Handle the identifier as the key symbol.
MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
if (getLexer().isNot(AsmToken::Comma))
return TokError("unexpected token in '.desc' directive");
Lex();
int64_t DescValue;
if (getParser().parseAbsoluteExpression(DescValue))
return true;
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.desc' directive");
Lex();
// Set the n_desc field of this Symbol to this DescValue
getStreamer().emitSymbolDesc(Sym, DescValue);
return false;
}
/// parseDirectiveIndirectSymbol
/// ::= .indirect_symbol identifier
bool DarwinAsmParser::parseDirectiveIndirectSymbol(StringRef, SMLoc Loc) {
const MCSectionMachO *Current = static_cast<const MCSectionMachO *>(
getStreamer().getCurrentSectionOnly());
MachO::SectionType SectionType = Current->getType();
if (SectionType != MachO::S_NON_LAZY_SYMBOL_POINTERS &&
SectionType != MachO::S_LAZY_SYMBOL_POINTERS &&
SectionType != MachO::S_THREAD_LOCAL_VARIABLE_POINTERS &&
SectionType != MachO::S_SYMBOL_STUBS)
return Error(Loc, "indirect symbol not in a symbol pointer or stub "
"section");
StringRef Name;
if (getParser().parseIdentifier(Name))
return TokError("expected identifier in .indirect_symbol directive");
MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
// Assembler local symbols don't make any sense here. Complain loudly.
if (Sym->isTemporary())
return TokError("non-local symbol required in directive");
if (!getStreamer().emitSymbolAttribute(Sym, MCSA_IndirectSymbol))
return TokError("unable to emit indirect symbol attribute for: " + Name);
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.indirect_symbol' directive");
Lex();
return false;
}
/// parseDirectiveDumpOrLoad
/// ::= ( .dump | .load ) "filename"
bool DarwinAsmParser::parseDirectiveDumpOrLoad(StringRef Directive,
SMLoc IDLoc) {
bool IsDump = Directive == ".dump";
if (getLexer().isNot(AsmToken::String))
return TokError("expected string in '.dump' or '.load' directive");
Lex();
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.dump' or '.load' directive");
Lex();
// FIXME: If/when .dump and .load are implemented they will be done in the
// the assembly parser and not have any need for an MCStreamer API.
if (IsDump)
return Warning(IDLoc, "ignoring directive .dump for now");
else
return Warning(IDLoc, "ignoring directive .load for now");
}
/// ParseDirectiveLinkerOption
/// ::= .linker_option "string" ( , "string" )*
bool DarwinAsmParser::parseDirectiveLinkerOption(StringRef IDVal, SMLoc) {
SmallVector<std::string, 4> Args;
while (true) {
if (getLexer().isNot(AsmToken::String))
return TokError("expected string in '" + Twine(IDVal) + "' directive");
std::string Data;
if (getParser().parseEscapedString(Data))
return true;
Args.push_back(Data);
if (getLexer().is(AsmToken::EndOfStatement))
break;
if (getLexer().isNot(AsmToken::Comma))
return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
Lex();
}
getStreamer().emitLinkerOptions(Args);
return false;
}
/// parseDirectiveLsym
/// ::= .lsym identifier , expression
bool DarwinAsmParser::parseDirectiveLsym(StringRef, SMLoc) {
StringRef Name;
if (getParser().parseIdentifier(Name))
return TokError("expected identifier in directive");
// Handle the identifier as the key symbol.
MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
if (getLexer().isNot(AsmToken::Comma))
return TokError("unexpected token in '.lsym' directive");
Lex();
const MCExpr *Value;
if (getParser().parseExpression(Value))
return true;
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.lsym' directive");
Lex();
// We don't currently support this directive.
//
// FIXME: Diagnostic location!
(void) Sym;
return TokError("directive '.lsym' is unsupported");
}
/// parseDirectiveSection:
/// ::= .section identifier (',' identifier)*
bool DarwinAsmParser::parseDirectiveSection(StringRef, SMLoc) {
SMLoc Loc = getLexer().getLoc();
StringRef SectionName;
if (getParser().parseIdentifier(SectionName))
return Error(Loc, "expected identifier after '.section' directive");
// Verify there is a following comma.
if (!getLexer().is(AsmToken::Comma))
return TokError("unexpected token in '.section' directive");
std::string SectionSpec = std::string(SectionName);
SectionSpec += ",";
// Add all the tokens until the end of the line, ParseSectionSpecifier will
// handle this.
StringRef EOL = getLexer().LexUntilEndOfStatement();
SectionSpec.append(EOL.begin(), EOL.end());
Lex();
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.section' directive");
Lex();
StringRef Segment, Section;
unsigned StubSize;
unsigned TAA;
bool TAAParsed;
if (class Error E = MCSectionMachO::ParseSectionSpecifier(
SectionSpec, Segment, Section, TAA, TAAParsed, StubSize))
return Error(Loc, toString(std::move(E)));
// Issue a warning if the target is not powerpc and Section is a *coal* section.
Triple TT = getParser().getContext().getTargetTriple();
Triple::ArchType ArchTy = TT.getArch();
if (ArchTy != Triple::ppc && ArchTy != Triple::ppc64) {
StringRef NonCoalSection = StringSwitch<StringRef>(Section)
.Case("__textcoal_nt", "__text")
.Case("__const_coal", "__const")
.Case("__datacoal_nt", "__data")
.Default(Section);
if (!Section.equals(NonCoalSection)) {
StringRef SectionVal(Loc.getPointer());
size_t B = SectionVal.find(',') + 1, E = SectionVal.find(',', B);
SMLoc BLoc = SMLoc::getFromPointer(SectionVal.data() + B);
SMLoc ELoc = SMLoc::getFromPointer(SectionVal.data() + E);
getParser().Warning(Loc, "section \"" + Section + "\" is deprecated",
SMRange(BLoc, ELoc));
getParser().Note(Loc, "change section name to \"" + NonCoalSection +
"\"", SMRange(BLoc, ELoc));
}
}
// FIXME: Arch specific.
bool isText = Segment == "__TEXT"; // FIXME: Hack.
getStreamer().SwitchSection(getContext().getMachOSection(
Segment, Section, TAA, StubSize,
isText ? SectionKind::getText() : SectionKind::getData()));
return false;
}
/// ParseDirectivePushSection:
/// ::= .pushsection identifier (',' identifier)*
bool DarwinAsmParser::parseDirectivePushSection(StringRef S, SMLoc Loc) {
getStreamer().PushSection();
if (parseDirectiveSection(S, Loc)) {
getStreamer().PopSection();
return true;
}
return false;
}
/// ParseDirectivePopSection:
/// ::= .popsection
bool DarwinAsmParser::parseDirectivePopSection(StringRef, SMLoc) {
if (!getStreamer().PopSection())
return TokError(".popsection without corresponding .pushsection");
return false;
}
/// ParseDirectivePrevious:
/// ::= .previous
bool DarwinAsmParser::parseDirectivePrevious(StringRef DirName, SMLoc) {
MCSectionSubPair PreviousSection = getStreamer().getPreviousSection();
if (!PreviousSection.first)
return TokError(".previous without corresponding .section");
getStreamer().SwitchSection(PreviousSection.first, PreviousSection.second);
return false;
}
/// ParseDirectiveSecureLogUnique
/// ::= .secure_log_unique ... message ...
bool DarwinAsmParser::parseDirectiveSecureLogUnique(StringRef, SMLoc IDLoc) {
StringRef LogMessage = getParser().parseStringToEndOfStatement();
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.secure_log_unique' directive");
if (getContext().getSecureLogUsed())
return Error(IDLoc, ".secure_log_unique specified multiple times");
// Get the secure log path.
const char *SecureLogFile = getContext().getSecureLogFile();
if (!SecureLogFile)
return Error(IDLoc, ".secure_log_unique used but AS_SECURE_LOG_FILE "
"environment variable unset.");
// Open the secure log file if we haven't already.
raw_fd_ostream *OS = getContext().getSecureLog();
if (!OS) {
std::error_code EC;
auto NewOS = std::make_unique<raw_fd_ostream>(StringRef(SecureLogFile), EC,
sys::fs::OF_Append |
sys::fs::OF_TextWithCRLF);
if (EC)
return Error(IDLoc, Twine("can't open secure log file: ") +
SecureLogFile + " (" + EC.message() + ")");
OS = NewOS.get();
getContext().setSecureLog(std::move(NewOS));
}
// Write the message.
unsigned CurBuf = getSourceManager().FindBufferContainingLoc(IDLoc);
*OS << getSourceManager().getBufferInfo(CurBuf).Buffer->getBufferIdentifier()
<< ":" << getSourceManager().FindLineNumber(IDLoc, CurBuf) << ":"
<< LogMessage + "\n";
getContext().setSecureLogUsed(true);
return false;
}
/// ParseDirectiveSecureLogReset
/// ::= .secure_log_reset
bool DarwinAsmParser::parseDirectiveSecureLogReset(StringRef, SMLoc IDLoc) {
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.secure_log_reset' directive");
Lex();
getContext().setSecureLogUsed(false);
return false;
}
/// parseDirectiveSubsectionsViaSymbols
/// ::= .subsections_via_symbols
bool DarwinAsmParser::parseDirectiveSubsectionsViaSymbols(StringRef, SMLoc) {
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.subsections_via_symbols' directive");
Lex();
getStreamer().emitAssemblerFlag(MCAF_SubsectionsViaSymbols);
return false;
}
/// ParseDirectiveTBSS
/// ::= .tbss identifier, size, align
bool DarwinAsmParser::parseDirectiveTBSS(StringRef, SMLoc) {
SMLoc IDLoc = getLexer().getLoc();
StringRef Name;
if (getParser().parseIdentifier(Name))
return TokError("expected identifier in directive");
// Handle the identifier as the key symbol.
MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
if (getLexer().isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lex();
int64_t Size;
SMLoc SizeLoc = getLexer().getLoc();
if (getParser().parseAbsoluteExpression(Size))
return true;
int64_t Pow2Alignment = 0;
SMLoc Pow2AlignmentLoc;
if (getLexer().is(AsmToken::Comma)) {
Lex();
Pow2AlignmentLoc = getLexer().getLoc();
if (getParser().parseAbsoluteExpression(Pow2Alignment))
return true;
}
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.tbss' directive");
Lex();
if (Size < 0)
return Error(SizeLoc, "invalid '.tbss' directive size, can't be less than"
"zero");
// FIXME: Diagnose overflow.
if (Pow2Alignment < 0)
return Error(Pow2AlignmentLoc, "invalid '.tbss' alignment, can't be less"
"than zero");
if (!Sym->isUndefined())
return Error(IDLoc, "invalid symbol redefinition");
getStreamer().emitTBSSSymbol(
getContext().getMachOSection("__DATA", "__thread_bss",
MachO::S_THREAD_LOCAL_ZEROFILL, 0,
SectionKind::getThreadBSS()),
Sym, Size, 1 << Pow2Alignment);
return false;
}
/// ParseDirectiveZerofill
/// ::= .zerofill segname , sectname [, identifier , size_expression [
/// , align_expression ]]
bool DarwinAsmParser::parseDirectiveZerofill(StringRef, SMLoc) {
StringRef Segment;
if (getParser().parseIdentifier(Segment))
return TokError("expected segment name after '.zerofill' directive");
if (getLexer().isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lex();
StringRef Section;
SMLoc SectionLoc = getLexer().getLoc();
if (getParser().parseIdentifier(Section))
return TokError("expected section name after comma in '.zerofill' "
"directive");
// If this is the end of the line all that was wanted was to create the
// the section but with no symbol.
if (getLexer().is(AsmToken::EndOfStatement)) {
// Create the zerofill section but no symbol
getStreamer().emitZerofill(
getContext().getMachOSection(Segment, Section, MachO::S_ZEROFILL, 0,
SectionKind::getBSS()),
/*Symbol=*/nullptr, /*Size=*/0, /*ByteAlignment=*/0, SectionLoc);
return false;
}
if (getLexer().isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lex();
SMLoc IDLoc = getLexer().getLoc();
StringRef IDStr;
if (getParser().parseIdentifier(IDStr))
return TokError("expected identifier in directive");
// handle the identifier as the key symbol.
MCSymbol *Sym = getContext().getOrCreateSymbol(IDStr);
if (getLexer().isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lex();
int64_t Size;
SMLoc SizeLoc = getLexer().getLoc();
if (getParser().parseAbsoluteExpression(Size))
return true;
int64_t Pow2Alignment = 0;
SMLoc Pow2AlignmentLoc;
if (getLexer().is(AsmToken::Comma)) {
Lex();
Pow2AlignmentLoc = getLexer().getLoc();
if (getParser().parseAbsoluteExpression(Pow2Alignment))
return true;
}
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.zerofill' directive");
Lex();
if (Size < 0)
return Error(SizeLoc, "invalid '.zerofill' directive size, can't be less "
"than zero");
// NOTE: The alignment in the directive is a power of 2 value, the assembler
// may internally end up wanting an alignment in bytes.
// FIXME: Diagnose overflow.
if (Pow2Alignment < 0)
return Error(Pow2AlignmentLoc, "invalid '.zerofill' directive alignment, "
"can't be less than zero");
if (!Sym->isUndefined())
return Error(IDLoc, "invalid symbol redefinition");
// Create the zerofill Symbol with Size and Pow2Alignment
//
// FIXME: Arch specific.
getStreamer().emitZerofill(getContext().getMachOSection(
Segment, Section, MachO::S_ZEROFILL,
0, SectionKind::getBSS()),
Sym, Size, 1 << Pow2Alignment, SectionLoc);
return false;
}
/// ParseDirectiveDataRegion
/// ::= .data_region [ ( jt8 | jt16 | jt32 ) ]
bool DarwinAsmParser::parseDirectiveDataRegion(StringRef, SMLoc) {
if (getLexer().is(AsmToken::EndOfStatement)) {
Lex();
getStreamer().emitDataRegion(MCDR_DataRegion);
return false;
}
StringRef RegionType;
SMLoc Loc = getParser().getTok().getLoc();
if (getParser().parseIdentifier(RegionType))
return TokError("expected region type after '.data_region' directive");
int Kind = StringSwitch<int>(RegionType)
.Case("jt8", MCDR_DataRegionJT8)
.Case("jt16", MCDR_DataRegionJT16)
.Case("jt32", MCDR_DataRegionJT32)
.Default(-1);
if (Kind == -1)
return Error(Loc, "unknown region type in '.data_region' directive");
Lex();
getStreamer().emitDataRegion((MCDataRegionType)Kind);
return false;
}
/// ParseDirectiveDataRegionEnd
/// ::= .end_data_region
bool DarwinAsmParser::parseDirectiveDataRegionEnd(StringRef, SMLoc) {
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.end_data_region' directive");