669 lines
27 KiB
C++
669 lines
27 KiB
C++
//===- DarwinAsmParser.cpp - Darwin (Mach-O) 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/MC/MCContext.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCParser/MCAsmLexer.h"
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#include "llvm/MC/MCParser/MCAsmParser.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/SourceMgr.h"
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using namespace llvm;
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namespace {
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/// \brief Implementation of directive handling which is shared across all
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/// Darwin targets.
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class DarwinAsmParser : public MCAsmParserExtension {
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template<bool (DarwinAsmParser::*Handler)(StringRef, SMLoc)>
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void AddDirectiveHandler(StringRef Directive) {
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getParser().AddDirectiveHandler(this, Directive,
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HandleDirective<DarwinAsmParser, Handler>);
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}
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bool ParseSectionSwitch(const char *Segment, const char *Section,
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unsigned TAA = 0, unsigned ImplicitAlign = 0,
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unsigned StubSize = 0);
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public:
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DarwinAsmParser() {}
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virtual void Initialize(MCAsmParser &Parser) {
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// Call the base implementation.
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this->MCAsmParserExtension::Initialize(Parser);
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AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveDesc>(".desc");
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AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveLsym>(".lsym");
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AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSubsectionsViaSymbols>(
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".subsections_via_symbols");
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AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveDumpOrLoad>(".dump");
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AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveDumpOrLoad>(".load");
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AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSection>(".section");
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AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSecureLogUnique>(
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".secure_log_unique");
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AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSecureLogReset>(
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".secure_log_reset");
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AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveTBSS>(".tbss");
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AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveZerofill>(".zerofill");
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// Special section directives.
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveConst>(".const");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveConstData>(".const_data");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveConstructor>(".constructor");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveCString>(".cstring");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveData>(".data");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveDestructor>(".destructor");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveDyld>(".dyld");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveFVMLibInit0>(".fvmlib_init0");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveFVMLibInit1>(".fvmlib_init1");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveLazySymbolPointers>(".lazy_symbol_pointer");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveLiteral16>(".literal16");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveLiteral4>(".literal4");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveLiteral8>(".literal8");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveModInitFunc>(".mod_init_func");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveModTermFunc>(".mod_term_func");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveNonLazySymbolPointers>(".non_lazy_symbol_pointer");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCCatClsMeth>(".objc_cat_cls_meth");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCCatInstMeth>(".objc_cat_inst_meth");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCCategory>(".objc_category");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClass>(".objc_class");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClassNames>(".objc_class_names");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClassVars>(".objc_class_vars");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClsMeth>(".objc_cls_meth");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClsRefs>(".objc_cls_refs");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCInstMeth>(".objc_inst_meth");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCInstanceVars>(".objc_instance_vars");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCMessageRefs>(".objc_message_refs");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCMetaClass>(".objc_meta_class");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCMethVarNames>(".objc_meth_var_names");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCMethVarTypes>(".objc_meth_var_types");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCModuleInfo>(".objc_module_info");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCProtocol>(".objc_protocol");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCSelectorStrs>(".objc_selector_strs");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCStringObject>(".objc_string_object");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCSymbols>(".objc_symbols");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectivePICSymbolStub>(".picsymbol_stub");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveStaticConst>(".static_const");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveStaticData>(".static_data");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveSymbolStub>(".symbol_stub");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveTData>(".tdata");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveText>(".text");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveThreadInitFunc>(".thread_init_func");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveTLV>(".tlv");
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AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveIdent>(".ident");
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}
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bool ParseDirectiveDesc(StringRef, SMLoc);
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bool ParseDirectiveDumpOrLoad(StringRef, SMLoc);
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bool ParseDirectiveLsym(StringRef, SMLoc);
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bool ParseDirectiveSection(StringRef, SMLoc);
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bool ParseDirectiveSecureLogReset(StringRef, SMLoc);
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bool ParseDirectiveSecureLogUnique(StringRef, SMLoc);
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bool ParseDirectiveSubsectionsViaSymbols(StringRef, SMLoc);
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bool ParseDirectiveTBSS(StringRef, SMLoc);
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bool ParseDirectiveZerofill(StringRef, SMLoc);
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// Named Section Directive
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bool ParseSectionDirectiveConst(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT", "__const");
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}
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bool ParseSectionDirectiveStaticConst(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT", "__static_const");
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}
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bool ParseSectionDirectiveCString(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT","__cstring",
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MCSectionMachO::S_CSTRING_LITERALS);
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}
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bool ParseSectionDirectiveLiteral4(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT", "__literal4",
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MCSectionMachO::S_4BYTE_LITERALS, 4);
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}
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bool ParseSectionDirectiveLiteral8(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT", "__literal8",
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MCSectionMachO::S_8BYTE_LITERALS, 8);
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}
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bool ParseSectionDirectiveLiteral16(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT","__literal16",
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MCSectionMachO::S_16BYTE_LITERALS, 16);
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}
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bool ParseSectionDirectiveConstructor(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT","__constructor");
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}
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bool ParseSectionDirectiveDestructor(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT","__destructor");
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}
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bool ParseSectionDirectiveFVMLibInit0(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT","__fvmlib_init0");
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}
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bool ParseSectionDirectiveFVMLibInit1(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT","__fvmlib_init1");
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}
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bool ParseSectionDirectiveSymbolStub(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT","__symbol_stub",
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MCSectionMachO::S_SYMBOL_STUBS |
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MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
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// FIXME: Different on PPC and ARM.
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0, 16);
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}
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bool ParseSectionDirectivePICSymbolStub(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT","__picsymbol_stub",
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MCSectionMachO::S_SYMBOL_STUBS |
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MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 0, 26);
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}
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bool ParseSectionDirectiveData(StringRef, SMLoc) {
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return ParseSectionSwitch("__DATA", "__data");
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}
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bool ParseSectionDirectiveStaticData(StringRef, SMLoc) {
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return ParseSectionSwitch("__DATA", "__static_data");
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}
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bool ParseSectionDirectiveNonLazySymbolPointers(StringRef, SMLoc) {
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return ParseSectionSwitch("__DATA", "__nl_symbol_ptr",
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MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS, 4);
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}
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bool ParseSectionDirectiveLazySymbolPointers(StringRef, SMLoc) {
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return ParseSectionSwitch("__DATA", "__la_symbol_ptr",
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MCSectionMachO::S_LAZY_SYMBOL_POINTERS, 4);
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}
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bool ParseSectionDirectiveDyld(StringRef, SMLoc) {
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return ParseSectionSwitch("__DATA", "__dyld");
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}
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bool ParseSectionDirectiveModInitFunc(StringRef, SMLoc) {
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return ParseSectionSwitch("__DATA", "__mod_init_func",
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MCSectionMachO::S_MOD_INIT_FUNC_POINTERS, 4);
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}
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bool ParseSectionDirectiveModTermFunc(StringRef, SMLoc) {
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return ParseSectionSwitch("__DATA", "__mod_term_func",
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MCSectionMachO::S_MOD_TERM_FUNC_POINTERS, 4);
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}
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bool ParseSectionDirectiveConstData(StringRef, SMLoc) {
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return ParseSectionSwitch("__DATA", "__const");
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}
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bool ParseSectionDirectiveObjCClass(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__class",
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MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
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}
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bool ParseSectionDirectiveObjCMetaClass(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__meta_class",
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MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
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}
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bool ParseSectionDirectiveObjCCatClsMeth(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__cat_cls_meth",
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MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
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}
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bool ParseSectionDirectiveObjCCatInstMeth(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__cat_inst_meth",
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MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
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}
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bool ParseSectionDirectiveObjCProtocol(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__protocol",
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MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
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}
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bool ParseSectionDirectiveObjCStringObject(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__string_object",
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MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
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}
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bool ParseSectionDirectiveObjCClsMeth(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__cls_meth",
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MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
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}
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bool ParseSectionDirectiveObjCInstMeth(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__inst_meth",
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MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
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}
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bool ParseSectionDirectiveObjCClsRefs(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__cls_refs",
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MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
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MCSectionMachO::S_LITERAL_POINTERS, 4);
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}
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bool ParseSectionDirectiveObjCMessageRefs(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__message_refs",
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MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
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MCSectionMachO::S_LITERAL_POINTERS, 4);
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}
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bool ParseSectionDirectiveObjCSymbols(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__symbols",
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MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
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}
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bool ParseSectionDirectiveObjCCategory(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__category",
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MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
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}
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bool ParseSectionDirectiveObjCClassVars(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__class_vars",
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MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
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}
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bool ParseSectionDirectiveObjCInstanceVars(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__instance_vars",
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MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
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}
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bool ParseSectionDirectiveObjCModuleInfo(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__module_info",
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MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
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}
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bool ParseSectionDirectiveObjCClassNames(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT", "__cstring",
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MCSectionMachO::S_CSTRING_LITERALS);
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}
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bool ParseSectionDirectiveObjCMethVarTypes(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT", "__cstring",
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MCSectionMachO::S_CSTRING_LITERALS);
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}
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bool ParseSectionDirectiveObjCMethVarNames(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT", "__cstring",
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MCSectionMachO::S_CSTRING_LITERALS);
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}
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bool ParseSectionDirectiveObjCSelectorStrs(StringRef, SMLoc) {
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return ParseSectionSwitch("__OBJC", "__selector_strs",
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MCSectionMachO::S_CSTRING_LITERALS);
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}
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bool ParseSectionDirectiveTData(StringRef, SMLoc) {
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return ParseSectionSwitch("__DATA", "__thread_data",
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MCSectionMachO::S_THREAD_LOCAL_REGULAR);
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}
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bool ParseSectionDirectiveText(StringRef, SMLoc) {
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return ParseSectionSwitch("__TEXT", "__text",
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MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS);
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}
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bool ParseSectionDirectiveTLV(StringRef, SMLoc) {
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return ParseSectionSwitch("__DATA", "__thread_vars",
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MCSectionMachO::S_THREAD_LOCAL_VARIABLES);
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}
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bool ParseSectionDirectiveIdent(StringRef, SMLoc) {
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// Darwin silently ignores the .ident directive.
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getParser().EatToEndOfStatement();
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return false;
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}
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bool ParseSectionDirectiveThreadInitFunc(StringRef, SMLoc) {
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return ParseSectionSwitch("__DATA", "__thread_init",
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MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS);
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}
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};
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}
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bool DarwinAsmParser::ParseSectionSwitch(const char *Segment,
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const char *Section,
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unsigned TAA, unsigned Align,
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unsigned StubSize) {
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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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// FIXME: Arch specific.
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bool isText = StringRef(Segment) == "__TEXT"; // FIXME: Hack.
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getStreamer().SwitchSection(getContext().getMachOSection(
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Segment, Section, TAA, StubSize,
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isText ? SectionKind::getText()
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: SectionKind::getDataRel()));
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// Set the implicit alignment, if any.
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//
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// FIXME: This isn't really what 'as' does; I think it just uses the implicit
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// alignment on the section (e.g., if one manually inserts bytes into the
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// section, then just issuing the section switch directive will not realign
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// the section. However, this is arguably more reasonable behavior, and there
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// is no good reason for someone to intentionally emit incorrectly sized
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// values into the implicitly aligned sections.
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if (Align)
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getStreamer().EmitValueToAlignment(Align, 0, 1, 0);
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return false;
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}
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/// ParseDirectiveDesc
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/// ::= .desc identifier , expression
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bool DarwinAsmParser::ParseDirectiveDesc(StringRef, SMLoc) {
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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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// Handle the identifier as the key symbol.
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MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("unexpected token in '.desc' directive");
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Lex();
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int64_t DescValue;
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if (getParser().ParseAbsoluteExpression(DescValue))
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return true;
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in '.desc' directive");
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Lex();
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// Set the n_desc field of this Symbol to this DescValue
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getStreamer().EmitSymbolDesc(Sym, DescValue);
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return false;
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}
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/// ParseDirectiveDumpOrLoad
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/// ::= ( .dump | .load ) "filename"
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bool DarwinAsmParser::ParseDirectiveDumpOrLoad(StringRef Directive,
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SMLoc IDLoc) {
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bool IsDump = Directive == ".dump";
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if (getLexer().isNot(AsmToken::String))
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return TokError("expected string in '.dump' or '.load' directive");
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Lex();
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in '.dump' or '.load' directive");
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Lex();
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// FIXME: If/when .dump and .load are implemented they will be done in the
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// the assembly parser and not have any need for an MCStreamer API.
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if (IsDump)
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return Warning(IDLoc, "ignoring directive .dump for now");
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else
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return Warning(IDLoc, "ignoring directive .load for now");
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}
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/// ParseDirectiveLsym
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/// ::= .lsym identifier , expression
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bool DarwinAsmParser::ParseDirectiveLsym(StringRef, SMLoc) {
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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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// Handle the identifier as the key symbol.
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MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("unexpected token in '.lsym' directive");
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Lex();
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const MCExpr *Value;
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if (getParser().ParseExpression(Value))
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return true;
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in '.lsym' directive");
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Lex();
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// We don't currently support this directive.
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//
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// FIXME: Diagnostic location!
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(void) Sym;
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return TokError("directive '.lsym' is unsupported");
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}
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/// ParseDirectiveSection:
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/// ::= .section identifier (',' identifier)*
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bool DarwinAsmParser::ParseDirectiveSection(StringRef, SMLoc) {
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SMLoc Loc = getLexer().getLoc();
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StringRef SectionName;
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if (getParser().ParseIdentifier(SectionName))
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return Error(Loc, "expected identifier after '.section' directive");
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// Verify there is a following comma.
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if (!getLexer().is(AsmToken::Comma))
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return TokError("unexpected token in '.section' directive");
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std::string SectionSpec = SectionName;
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SectionSpec += ",";
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// Add all the tokens until the end of the line, ParseSectionSpecifier will
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// handle this.
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StringRef EOL = getLexer().LexUntilEndOfStatement();
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SectionSpec.append(EOL.begin(), EOL.end());
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Lex();
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in '.section' directive");
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Lex();
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StringRef Segment, Section;
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unsigned StubSize;
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unsigned TAA;
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bool TAAParsed;
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std::string ErrorStr =
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MCSectionMachO::ParseSectionSpecifier(SectionSpec, Segment, Section,
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TAA, TAAParsed, StubSize);
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if (!ErrorStr.empty())
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return Error(Loc, ErrorStr.c_str());
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// FIXME: Arch specific.
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bool isText = Segment == "__TEXT"; // FIXME: Hack.
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getStreamer().SwitchSection(getContext().getMachOSection(
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Segment, Section, TAA, StubSize,
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isText ? SectionKind::getText()
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: SectionKind::getDataRel()));
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return false;
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}
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/// ParseDirectiveSecureLogUnique
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/// ::= .secure_log_unique ... message ...
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bool DarwinAsmParser::ParseDirectiveSecureLogUnique(StringRef, SMLoc IDLoc) {
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StringRef LogMessage = getParser().ParseStringToEndOfStatement();
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in '.secure_log_unique' directive");
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if (getContext().getSecureLogUsed() != false)
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return Error(IDLoc, ".secure_log_unique specified multiple times");
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// Get the secure log path.
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const char *SecureLogFile = getContext().getSecureLogFile();
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if (SecureLogFile == NULL)
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return Error(IDLoc, ".secure_log_unique used but AS_SECURE_LOG_FILE "
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"environment variable unset.");
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// Open the secure log file if we haven't already.
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raw_ostream *OS = getContext().getSecureLog();
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if (OS == NULL) {
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std::string Err;
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OS = new raw_fd_ostream(SecureLogFile, Err, raw_fd_ostream::F_Append);
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if (!Err.empty()) {
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delete OS;
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return Error(IDLoc, Twine("can't open secure log file: ") +
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SecureLogFile + " (" + Err + ")");
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}
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getContext().setSecureLog(OS);
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}
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// Write the message.
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int CurBuf = getSourceManager().FindBufferContainingLoc(IDLoc);
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*OS << getSourceManager().getBufferInfo(CurBuf).Buffer->getBufferIdentifier()
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<< ":" << getSourceManager().FindLineNumber(IDLoc, CurBuf) << ":"
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<< LogMessage + "\n";
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getContext().setSecureLogUsed(true);
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return false;
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}
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/// ParseDirectiveSecureLogReset
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/// ::= .secure_log_reset
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bool DarwinAsmParser::ParseDirectiveSecureLogReset(StringRef, SMLoc IDLoc) {
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in '.secure_log_reset' directive");
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Lex();
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getContext().setSecureLogUsed(false);
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return false;
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}
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/// ParseDirectiveSubsectionsViaSymbols
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/// ::= .subsections_via_symbols
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bool DarwinAsmParser::ParseDirectiveSubsectionsViaSymbols(StringRef, SMLoc) {
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in '.subsections_via_symbols' directive");
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Lex();
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getStreamer().EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
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return false;
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}
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/// ParseDirectiveTBSS
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/// ::= .tbss identifier, size, align
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bool DarwinAsmParser::ParseDirectiveTBSS(StringRef, SMLoc) {
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SMLoc IDLoc = getLexer().getLoc();
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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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// Handle the identifier as the key symbol.
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MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
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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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int64_t Size;
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SMLoc SizeLoc = getLexer().getLoc();
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if (getParser().ParseAbsoluteExpression(Size))
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return true;
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int64_t Pow2Alignment = 0;
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SMLoc Pow2AlignmentLoc;
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if (getLexer().is(AsmToken::Comma)) {
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Lex();
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Pow2AlignmentLoc = getLexer().getLoc();
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if (getParser().ParseAbsoluteExpression(Pow2Alignment))
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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 '.tbss' directive");
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Lex();
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if (Size < 0)
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return Error(SizeLoc, "invalid '.tbss' directive size, can't be less than"
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"zero");
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// FIXME: Diagnose overflow.
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if (Pow2Alignment < 0)
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return Error(Pow2AlignmentLoc, "invalid '.tbss' alignment, can't be less"
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"than zero");
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if (!Sym->isUndefined())
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return Error(IDLoc, "invalid symbol redefinition");
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getStreamer().EmitTBSSSymbol(getContext().getMachOSection(
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"__DATA", "__thread_bss",
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MCSectionMachO::S_THREAD_LOCAL_ZEROFILL,
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0, SectionKind::getThreadBSS()),
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Sym, Size, 1 << Pow2Alignment);
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return false;
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}
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/// ParseDirectiveZerofill
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/// ::= .zerofill segname , sectname [, identifier , size_expression [
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/// , align_expression ]]
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bool DarwinAsmParser::ParseDirectiveZerofill(StringRef, SMLoc) {
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StringRef Segment;
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if (getParser().ParseIdentifier(Segment))
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return TokError("expected segment name after '.zerofill' directive");
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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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StringRef Section;
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if (getParser().ParseIdentifier(Section))
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return TokError("expected section name after comma in '.zerofill' "
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"directive");
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// If this is the end of the line all that was wanted was to create the
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// the section but with no symbol.
|
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if (getLexer().is(AsmToken::EndOfStatement)) {
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// Create the zerofill section but no symbol
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getStreamer().EmitZerofill(getContext().getMachOSection(
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Segment, Section, MCSectionMachO::S_ZEROFILL,
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0, SectionKind::getBSS()));
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return false;
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}
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if (getLexer().isNot(AsmToken::Comma))
|
|
return TokError("unexpected token in directive");
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|
Lex();
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SMLoc IDLoc = getLexer().getLoc();
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|
StringRef IDStr;
|
|
if (getParser().ParseIdentifier(IDStr))
|
|
return TokError("expected identifier in directive");
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|
|
|
// handle the identifier as the key symbol.
|
|
MCSymbol *Sym = getContext().GetOrCreateSymbol(IDStr);
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|
|
|
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, MCSectionMachO::S_ZEROFILL,
|
|
0, SectionKind::getBSS()),
|
|
Sym, Size, 1 << Pow2Alignment);
|
|
|
|
return false;
|
|
}
|
|
|
|
namespace llvm {
|
|
|
|
MCAsmParserExtension *createDarwinAsmParser() {
|
|
return new DarwinAsmParser;
|
|
}
|
|
|
|
}
|