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135 lines
4.8 KiB
135 lines
4.8 KiB
//===- MCAsmInfo.cpp - Asm Info -------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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/BinaryFormat/Dwarf.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/CommandLine.h"
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using namespace llvm;
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enum DefaultOnOff { Default, Enable, Disable };
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static cl::opt<DefaultOnOff> DwarfExtendedLoc(
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"dwarf-extended-loc", cl::Hidden,
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cl::desc("Disable emission of the extended flags in .loc directives."),
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cl::values(clEnumVal(Default, "Default for platform"),
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clEnumVal(Enable, "Enabled"), clEnumVal(Disable, "Disabled")),
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cl::init(Default));
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cl::opt<cl::boolOrDefault> UseLEB128Directives(
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"use-leb128-directives", cl::Hidden,
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cl::desc(
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"Disable the usage of LEB128 directives, and generate .byte instead."),
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cl::init(cl::BOU_UNSET));
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MCAsmInfo::MCAsmInfo() {
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SeparatorString = ";";
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CommentString = "#";
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LabelSuffix = ":";
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PrivateGlobalPrefix = "L";
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PrivateLabelPrefix = 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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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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GlobalDirective = "\t.globl\t";
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WeakDirective = "\t.weak\t";
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if (DwarfExtendedLoc != Default)
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SupportsExtendedDwarfLocDirective = DwarfExtendedLoc == Enable;
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if (UseLEB128Directives != cl::BOU_UNSET)
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HasLEB128Directives = UseLEB128Directives == cl::BOU_TRUE;
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// FIXME: Clang's logic should be synced with the logic used to initialize
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// this member and the two implementations should be merged.
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// For reference:
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// - Solaris always enables the integrated assembler by default
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// - SparcELFMCAsmInfo and X86ELFMCAsmInfo are handling this case
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// - Windows always enables the integrated assembler by default
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// - MCAsmInfoCOFF is handling this case, should it be MCAsmInfoMicrosoft?
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// - MachO targets always enables the integrated assembler by default
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// - MCAsmInfoDarwin is handling this case
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// - Generic_GCC toolchains enable the integrated assembler on a per
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// architecture basis.
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// - The target subclasses for AArch64, ARM, and X86 handle these cases
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UseIntegratedAssembler = true;
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PreserveAsmComments = true;
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}
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MCAsmInfo::~MCAsmInfo() = default;
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void MCAsmInfo::addInitialFrameState(const MCCFIInstruction &Inst) {
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InitialFrameState.push_back(Inst);
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}
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bool MCAsmInfo::isSectionAtomizableBySymbols(const MCSection &Section) const {
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return false;
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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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bool MCAsmInfo::isAcceptableChar(char C) const {
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return (C >= 'a' && C <= 'z') || (C >= 'A' && C <= 'Z') ||
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(C >= '0' && C <= '9') || C == '_' || C == '$' || C == '.' || C == '@';
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}
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bool MCAsmInfo::isValidUnquotedName(StringRef Name) const {
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if (Name.empty())
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return false;
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// If any of the characters in the string is an unacceptable character, force
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// quotes.
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for (char C : Name) {
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if (!isAcceptableChar(C))
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return false;
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}
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return true;
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}
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bool MCAsmInfo::shouldOmitSectionDirective(StringRef SectionName) const {
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// FIXME: Does .section .bss/.data/.text work everywhere??
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return SectionName == ".text" || SectionName == ".data" ||
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(SectionName == ".bss" && !usesELFSectionDirectiveForBSS());
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}
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