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llvm-mirror/lib/MC/MCParser/DarwinAsmParser.cpp
Bill Wendling f937f0ed59 Fix spelling. 
llvm-svn: 116804
2010-10-19 10:18:23 +00:00

662 lines
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//===- DarwinAsmParser.cpp - Darwin (Mach-O) Assembly Parser --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCParser/MCAsmParserExtension.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCParser/MCAsmLexer.h"
#include "llvm/MC/MCParser/MCAsmParser.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
using namespace llvm;
namespace {
/// \brief Implementation of directive handling which is shared across all
/// Darwin targets.
class DarwinAsmParser : public MCAsmParserExtension {
template<bool (DarwinAsmParser::*Handler)(StringRef, SMLoc)>
void AddDirectiveHandler(StringRef Directive) {
getParser().AddDirectiveHandler(this, Directive,
HandleDirective<DarwinAsmParser, Handler>);
}
bool ParseSectionSwitch(const char *Segment, const char *Section,
unsigned TAA = 0, unsigned ImplicitAlign = 0,
unsigned StubSize = 0);
public:
DarwinAsmParser() {}
virtual void Initialize(MCAsmParser &Parser) {
// Call the base implementation.
this->MCAsmParserExtension::Initialize(Parser);
AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveDesc>(".desc");
AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveLsym>(".lsym");
AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSubsectionsViaSymbols>(
".subsections_via_symbols");
AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveDumpOrLoad>(".dump");
AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveDumpOrLoad>(".load");
AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSection>(".section");
AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSecureLogUnique>(
".secure_log_unique");
AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSecureLogReset>(
".secure_log_reset");
AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveTBSS>(".tbss");
AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveZerofill>(".zerofill");
// Special section directives.
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::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::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");
}
bool ParseDirectiveDesc(StringRef, SMLoc);
bool ParseDirectiveDumpOrLoad(StringRef, SMLoc);
bool ParseDirectiveLsym(StringRef, SMLoc);
bool ParseDirectiveSection(StringRef, SMLoc);
bool ParseDirectiveSecureLogReset(StringRef, SMLoc);
bool ParseDirectiveSecureLogUnique(StringRef, SMLoc);
bool ParseDirectiveSubsectionsViaSymbols(StringRef, SMLoc);
bool ParseDirectiveTBSS(StringRef, SMLoc);
bool ParseDirectiveZerofill(StringRef, SMLoc);
// Named Section Directive
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",
MCSectionMachO::S_CSTRING_LITERALS);
}
bool ParseSectionDirectiveLiteral4(StringRef, SMLoc) {
return ParseSectionSwitch("__TEXT", "__literal4",
MCSectionMachO::S_4BYTE_LITERALS, 4);
}
bool ParseSectionDirectiveLiteral8(StringRef, SMLoc) {
return ParseSectionSwitch("__TEXT", "__literal8",
MCSectionMachO::S_8BYTE_LITERALS, 8);
}
bool ParseSectionDirectiveLiteral16(StringRef, SMLoc) {
return ParseSectionSwitch("__TEXT","__literal16",
MCSectionMachO::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",
MCSectionMachO::S_SYMBOL_STUBS |
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
// FIXME: Different on PPC and ARM.
0, 16);
}
bool ParseSectionDirectivePICSymbolStub(StringRef, SMLoc) {
return ParseSectionSwitch("__TEXT","__picsymbol_stub",
MCSectionMachO::S_SYMBOL_STUBS |
MCSectionMachO::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",
MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS, 4);
}
bool ParseSectionDirectiveLazySymbolPointers(StringRef, SMLoc) {
return ParseSectionSwitch("__DATA", "__la_symbol_ptr",
MCSectionMachO::S_LAZY_SYMBOL_POINTERS, 4);
}
bool ParseSectionDirectiveDyld(StringRef, SMLoc) {
return ParseSectionSwitch("__DATA", "__dyld");
}
bool ParseSectionDirectiveModInitFunc(StringRef, SMLoc) {
return ParseSectionSwitch("__DATA", "__mod_init_func",
MCSectionMachO::S_MOD_INIT_FUNC_POINTERS, 4);
}
bool ParseSectionDirectiveModTermFunc(StringRef, SMLoc) {
return ParseSectionSwitch("__DATA", "__mod_term_func",
MCSectionMachO::S_MOD_TERM_FUNC_POINTERS, 4);
}
bool ParseSectionDirectiveConstData(StringRef, SMLoc) {
return ParseSectionSwitch("__DATA", "__const");
}
bool ParseSectionDirectiveObjCClass(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__class",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
}
bool ParseSectionDirectiveObjCMetaClass(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__meta_class",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
}
bool ParseSectionDirectiveObjCCatClsMeth(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__cat_cls_meth",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
}
bool ParseSectionDirectiveObjCCatInstMeth(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__cat_inst_meth",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
}
bool ParseSectionDirectiveObjCProtocol(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__protocol",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
}
bool ParseSectionDirectiveObjCStringObject(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__string_object",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
}
bool ParseSectionDirectiveObjCClsMeth(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__cls_meth",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
}
bool ParseSectionDirectiveObjCInstMeth(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__inst_meth",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
}
bool ParseSectionDirectiveObjCClsRefs(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__cls_refs",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
MCSectionMachO::S_LITERAL_POINTERS, 4);
}
bool ParseSectionDirectiveObjCMessageRefs(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__message_refs",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
MCSectionMachO::S_LITERAL_POINTERS, 4);
}
bool ParseSectionDirectiveObjCSymbols(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__symbols",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
}
bool ParseSectionDirectiveObjCCategory(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__category",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
}
bool ParseSectionDirectiveObjCClassVars(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__class_vars",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
}
bool ParseSectionDirectiveObjCInstanceVars(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__instance_vars",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
}
bool ParseSectionDirectiveObjCModuleInfo(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__module_info",
MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
}
bool ParseSectionDirectiveObjCClassNames(StringRef, SMLoc) {
return ParseSectionSwitch("__TEXT", "__cstring",
MCSectionMachO::S_CSTRING_LITERALS);
}
bool ParseSectionDirectiveObjCMethVarTypes(StringRef, SMLoc) {
return ParseSectionSwitch("__TEXT", "__cstring",
MCSectionMachO::S_CSTRING_LITERALS);
}
bool ParseSectionDirectiveObjCMethVarNames(StringRef, SMLoc) {
return ParseSectionSwitch("__TEXT", "__cstring",
MCSectionMachO::S_CSTRING_LITERALS);
}
bool ParseSectionDirectiveObjCSelectorStrs(StringRef, SMLoc) {
return ParseSectionSwitch("__OBJC", "__selector_strs",
MCSectionMachO::S_CSTRING_LITERALS);
}
bool ParseSectionDirectiveTData(StringRef, SMLoc) {
return ParseSectionSwitch("__DATA", "__thread_data",
MCSectionMachO::S_THREAD_LOCAL_REGULAR);
}
bool ParseSectionDirectiveText(StringRef, SMLoc) {
return ParseSectionSwitch("__TEXT", "__text",
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS);
}
bool ParseSectionDirectiveTLV(StringRef, SMLoc) {
return ParseSectionSwitch("__DATA", "__thread_vars",
MCSectionMachO::S_THREAD_LOCAL_VARIABLES);
}
bool ParseSectionDirectiveThreadInitFunc(StringRef, SMLoc) {
return ParseSectionSwitch("__DATA", "__thread_init",
MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS);
}
};
}
bool DarwinAsmParser::ParseSectionSwitch(const char *Segment,
const char *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 = StringRef(Segment) == "__TEXT"; // FIXME: Hack.
getStreamer().SwitchSection(getContext().getMachOSection(
Segment, Section, TAA, StubSize,
isText ? SectionKind::getText()
: SectionKind::getDataRel()));
// 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, 0, 1, 0);
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;
}
/// 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)
Warning(IDLoc, "ignoring directive .dump for now");
else
Warning(IDLoc, "ignoring directive .load for now");
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 = 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 TAA, StubSize;
std::string ErrorStr =
MCSectionMachO::ParseSectionSpecifier(SectionSpec, Segment, Section,
TAA, StubSize);
if (!ErrorStr.empty())
return Error(Loc, ErrorStr.c_str());
// FIXME: Arch specific.
bool isText = Segment == "__TEXT"; // FIXME: Hack.
getStreamer().SwitchSection(getContext().getMachOSection(
Segment, Section, TAA, StubSize,
isText ? SectionKind::getText()
: SectionKind::getDataRel()));
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() != false)
return Error(IDLoc, ".secure_log_unique specified multiple times");
// Get the secure log path.
const char *SecureLogFile = getContext().getSecureLogFile();
if (SecureLogFile == NULL)
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_ostream *OS = getContext().getSecureLog();
if (OS == NULL) {
std::string Err;
OS = new raw_fd_ostream(SecureLogFile, Err, raw_fd_ostream::F_Append);
if (!Err.empty()) {
delete OS;
return Error(IDLoc, Twine("can't open secure log file: ") +
SecureLogFile + " (" + Err + ")");
}
getContext().setSecureLog(OS);
}
// Write the message.
int 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",
MCSectionMachO::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;
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, MCSectionMachO::S_ZEROFILL,
0, SectionKind::getBSS()));
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, MCSectionMachO::S_ZEROFILL,
0, SectionKind::getBSS()),
Sym, Size, 1 << Pow2Alignment);
return false;
}
namespace llvm {
MCAsmParserExtension *createDarwinAsmParser() {
return new DarwinAsmParser;
}
}
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