-//===-- MCAsmInfo.cpp - Asm Info -------------------------------------------==//
+//===- MCAsmInfo.cpp - Asm Info -------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCStreamer.h"
-#include "llvm/Support/DataTypes.h"
-#include "llvm/Support/Dwarf.h"
-#include <cctype>
-#include <cstring>
+#include "llvm/Support/CommandLine.h"
+
using namespace llvm;
-MCAsmInfo::MCAsmInfo() {
- PointerSize = 4;
- CalleeSaveStackSlotSize = 0; // 0 means PointerSize is used in getter.
+enum DefaultOnOff { Default, Enable, Disable };
+static cl::opt<DefaultOnOff> DwarfExtendedLoc(
+ "dwarf-extended-loc", cl::Hidden,
+ cl::desc("Disable emission of the extended flags in .loc directives."),
+ cl::values(clEnumVal(Default, "Default for platform"),
+ clEnumVal(Enable, "Enabled"), clEnumVal(Disable, "Disabled")),
+ cl::init(Default));
- IsLittleEndian = true;
- StackGrowsUp = false;
- HasSubsectionsViaSymbols = false;
- HasMachoZeroFillDirective = false;
- HasMachoTBSSDirective = false;
- HasStaticCtorDtorReferenceInStaticMode = false;
- LinkerRequiresNonEmptyDwarfLines = false;
- MaxInstLength = 4;
- PCSymbol = "$";
+MCAsmInfo::MCAsmInfo() {
SeparatorString = ";";
- CommentColumn = 40;
CommentString = "#";
LabelSuffix = ":";
- DebugLabelSuffix = ":";
- GlobalPrefix = "";
- PrivateGlobalPrefix = ".";
+ PrivateGlobalPrefix = "L";
+ PrivateLabelPrefix = PrivateGlobalPrefix;
LinkerPrivateGlobalPrefix = "";
InlineAsmStart = "APP";
InlineAsmEnd = "NO_APP";
Code16Directive = ".code16";
Code32Directive = ".code32";
Code64Directive = ".code64";
- AssemblerDialect = 0;
- AllowQuotesInName = false;
- AllowNameToStartWithDigit = false;
- AllowPeriodsInName = true;
- AllowUTF8 = true;
- UseDataRegionDirectives = false;
ZeroDirective = "\t.zero\t";
AsciiDirective = "\t.ascii\t";
AscizDirective = "\t.asciz\t";
Data16bitsDirective = "\t.short\t";
Data32bitsDirective = "\t.long\t";
Data64bitsDirective = "\t.quad\t";
- SunStyleELFSectionSwitchSyntax = false;
- UsesELFSectionDirectiveForBSS = false;
- AlignDirective = "\t.align\t";
- AlignmentIsInBytes = true;
- TextAlignFillValue = 0;
- GPRel64Directive = 0;
- GPRel32Directive = 0;
GlobalDirective = "\t.globl\t";
- HasSetDirective = true;
- HasAggressiveSymbolFolding = true;
- COMMDirectiveAlignmentIsInBytes = true;
- LCOMMDirectiveAlignmentType = LCOMM::NoAlignment;
- HasDotTypeDotSizeDirective = true;
- HasSingleParameterDotFile = true;
- HasNoDeadStrip = false;
- HasSymbolResolver = false;
- WeakRefDirective = 0;
- WeakDefDirective = 0;
- LinkOnceDirective = 0;
- HiddenVisibilityAttr = MCSA_Hidden;
- HiddenDeclarationVisibilityAttr = MCSA_Hidden;
- ProtectedVisibilityAttr = MCSA_Protected;
- HasLEB128 = false;
- SupportsDebugInformation = false;
- ExceptionsType = ExceptionHandling::None;
- DwarfUsesInlineInfoSection = false;
- DwarfSectionOffsetDirective = 0;
- DwarfUsesRelocationsAcrossSections = true;
- DwarfRegNumForCFI = false;
- HasMicrosoftFastStdCallMangling = false;
-}
+ WeakDirective = "\t.weak\t";
+ if (DwarfExtendedLoc != Default)
+ SupportsExtendedDwarfLocDirective = DwarfExtendedLoc == Enable;
-MCAsmInfo::~MCAsmInfo() {
+ // FIXME: Clang's logic should be synced with the logic used to initialize
+ // this member and the two implementations should be merged.
+ // For reference:
+ // - Solaris always enables the integrated assembler by default
+ // - SparcELFMCAsmInfo and X86ELFMCAsmInfo are handling this case
+ // - Windows always enables the integrated assembler by default
+ // - MCAsmInfoCOFF is handling this case, should it be MCAsmInfoMicrosoft?
+ // - MachO targets always enables the integrated assembler by default
+ // - MCAsmInfoDarwin is handling this case
+ // - Generic_GCC toolchains enable the integrated assembler on a per
+ // architecture basis.
+ // - The target subclasses for AArch64, ARM, and X86 handle these cases
+ UseIntegratedAssembler = false;
+ PreserveAsmComments = true;
}
+MCAsmInfo::~MCAsmInfo() = default;
-unsigned MCAsmInfo::getULEB128Size(unsigned Value) {
- unsigned Size = 0;
- do {
- Value >>= 7;
- Size += sizeof(int8_t);
- } while (Value);
- return Size;
-}
-
-unsigned MCAsmInfo::getSLEB128Size(int Value) {
- unsigned Size = 0;
- int Sign = Value >> (8 * sizeof(Value) - 1);
- bool IsMore;
-
- do {
- unsigned Byte = Value & 0x7f;
- Value >>= 7;
- IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
- Size += sizeof(int8_t);
- } while (IsMore);
- return Size;
+bool MCAsmInfo::isSectionAtomizableBySymbols(const MCSection &Section) const {
+ return false;
}
const MCExpr *
unsigned Encoding,
MCStreamer &Streamer) const {
if (!(Encoding & dwarf::DW_EH_PE_pcrel))
- return MCSymbolRefExpr::Create(Sym, Streamer.getContext());
+ return MCSymbolRefExpr::create(Sym, Streamer.getContext());
MCContext &Context = Streamer.getContext();
- const MCExpr *Res = MCSymbolRefExpr::Create(Sym, Context);
- MCSymbol *PCSym = Context.CreateTempSymbol();
+ const MCExpr *Res = MCSymbolRefExpr::create(Sym, Context);
+ MCSymbol *PCSym = Context.createTempSymbol();
Streamer.EmitLabel(PCSym);
- const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, Context);
- return MCBinaryExpr::CreateSub(Res, PC, Context);
+ const MCExpr *PC = MCSymbolRefExpr::create(PCSym, Context);
+ return MCBinaryExpr::createSub(Res, PC, Context);
+}
+
+static bool isAcceptableChar(char C) {
+ return (C >= 'a' && C <= 'z') || (C >= 'A' && C <= 'Z') ||
+ (C >= '0' && C <= '9') || C == '_' || C == '$' || C == '.' || C == '@';
+}
+
+bool MCAsmInfo::isValidUnquotedName(StringRef Name) const {
+ if (Name.empty())
+ return false;
+
+ // If any of the characters in the string is an unacceptable character, force
+ // quotes.
+ for (char C : Name) {
+ if (!isAcceptableChar(C))
+ return false;
+ }
+
+ return true;
+}
+
+bool MCAsmInfo::shouldOmitSectionDirective(StringRef SectionName) const {
+ // FIXME: Does .section .bss/.data/.text work everywhere??
+ return SectionName == ".text" || SectionName == ".data" ||
+ (SectionName == ".bss" && !usesELFSectionDirectiveForBSS());
}
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