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343a996ca5
Use a dedicated MachO load command to annotate data-in-code regions.
This is the same format the linker produces for final executable images,
allowing consistency of representation and use of introspection tools
for both object and executable files.
Data-in-code regions are annotated via ".data_region"/".end_data_region"
directive pairs, with an optional region type.
data_region_directive := ".data_region" { region_type }
region_type := "jt8" | "jt16" | "jt32" | "jta32"
end_data_region_directive := ".end_data_region"
The previous handling of ARM-style "$d.*" labels was broken and has
been removed. Specifically, it didn't handle ARM vs. Thumb mode when
marking the end of the section.
rdar://11459456
llvm-svn: 157062
143 lines
4.2 KiB
C++
143 lines
4.2 KiB
C++
//===-- MCAsmInfo.cpp - Asm Info -------------------------------------------==//
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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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//
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// This file defines target asm properties related what form asm statements
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// should take.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/Dwarf.h"
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#include <cctype>
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#include <cstring>
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using namespace llvm;
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MCAsmInfo::MCAsmInfo() {
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PointerSize = 4;
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IsLittleEndian = true;
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StackGrowsUp = false;
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HasSubsectionsViaSymbols = false;
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HasMachoZeroFillDirective = false;
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HasMachoTBSSDirective = false;
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HasStaticCtorDtorReferenceInStaticMode = false;
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LinkerRequiresNonEmptyDwarfLines = false;
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MaxInstLength = 4;
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PCSymbol = "$";
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SeparatorString = ";";
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CommentColumn = 40;
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CommentString = "#";
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LabelSuffix = ":";
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GlobalPrefix = "";
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PrivateGlobalPrefix = ".";
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LinkerPrivateGlobalPrefix = "";
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InlineAsmStart = "APP";
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InlineAsmEnd = "NO_APP";
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Code16Directive = ".code16";
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Code32Directive = ".code32";
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Code64Directive = ".code64";
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AssemblerDialect = 0;
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AllowQuotesInName = false;
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AllowNameToStartWithDigit = false;
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AllowPeriodsInName = true;
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AllowUTF8 = true;
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UseDataRegionDirectives = false;
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ZeroDirective = "\t.zero\t";
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AsciiDirective = "\t.ascii\t";
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AscizDirective = "\t.asciz\t";
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Data8bitsDirective = "\t.byte\t";
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Data16bitsDirective = "\t.short\t";
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Data32bitsDirective = "\t.long\t";
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Data64bitsDirective = "\t.quad\t";
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SunStyleELFSectionSwitchSyntax = false;
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UsesELFSectionDirectiveForBSS = false;
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AlignDirective = "\t.align\t";
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AlignmentIsInBytes = true;
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TextAlignFillValue = 0;
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GPRel64Directive = 0;
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GPRel32Directive = 0;
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GlobalDirective = "\t.globl\t";
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HasSetDirective = true;
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HasAggressiveSymbolFolding = true;
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LCOMMDirectiveType = LCOMM::None;
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COMMDirectiveAlignmentIsInBytes = true;
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HasDotTypeDotSizeDirective = true;
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HasSingleParameterDotFile = true;
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HasNoDeadStrip = false;
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HasSymbolResolver = false;
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WeakRefDirective = 0;
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WeakDefDirective = 0;
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LinkOnceDirective = 0;
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HiddenVisibilityAttr = MCSA_Hidden;
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HiddenDeclarationVisibilityAttr = MCSA_Hidden;
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ProtectedVisibilityAttr = MCSA_Protected;
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HasLEB128 = false;
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SupportsDebugInformation = false;
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ExceptionsType = ExceptionHandling::None;
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DwarfUsesInlineInfoSection = false;
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DwarfRequiresRelocationForSectionOffset = true;
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DwarfSectionOffsetDirective = 0;
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DwarfUsesLabelOffsetForRanges = true;
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DwarfUsesRelocationsForStringPool = true;
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DwarfRegNumForCFI = false;
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HasMicrosoftFastStdCallMangling = false;
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}
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MCAsmInfo::~MCAsmInfo() {
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}
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unsigned MCAsmInfo::getULEB128Size(unsigned Value) {
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unsigned Size = 0;
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do {
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Value >>= 7;
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Size += sizeof(int8_t);
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} while (Value);
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return Size;
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}
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unsigned MCAsmInfo::getSLEB128Size(int Value) {
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unsigned Size = 0;
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int Sign = Value >> (8 * sizeof(Value) - 1);
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bool IsMore;
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do {
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unsigned Byte = Value & 0x7f;
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Value >>= 7;
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IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
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Size += sizeof(int8_t);
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} while (IsMore);
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return Size;
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}
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const MCExpr *
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MCAsmInfo::getExprForPersonalitySymbol(const MCSymbol *Sym,
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unsigned Encoding,
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MCStreamer &Streamer) const {
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return getExprForFDESymbol(Sym, Encoding, Streamer);
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}
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const MCExpr *
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MCAsmInfo::getExprForFDESymbol(const MCSymbol *Sym,
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unsigned Encoding,
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MCStreamer &Streamer) const {
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if (!(Encoding & dwarf::DW_EH_PE_pcrel))
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return MCSymbolRefExpr::Create(Sym, Streamer.getContext());
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MCContext &Context = Streamer.getContext();
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const MCExpr *Res = MCSymbolRefExpr::Create(Sym, Context);
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MCSymbol *PCSym = Context.CreateTempSymbol();
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Streamer.EmitLabel(PCSym);
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const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, Context);
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return MCBinaryExpr::CreateSub(Res, PC, Context);
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}
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