llvm-project/llvm/lib/MC/MCAsmInfo.cpp

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//===- MCAsmInfo.cpp - Asm Info -------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines target asm properties related what form asm statements
// should take.
//
//===----------------------------------------------------------------------===//
#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/CommandLine.h"
using namespace llvm;
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));
cl::opt<cl::boolOrDefault> UseLEB128Directives(
"use-leb128-directives", cl::Hidden,
cl::desc(
"Disable the usage of LEB128 directives, and generate .byte instead."),
cl::init(cl::BOU_UNSET));
MCAsmInfo::MCAsmInfo() {
SeparatorString = ";";
CommentString = "#";
LabelSuffix = ":";
PrivateGlobalPrefix = "L";
PrivateLabelPrefix = PrivateGlobalPrefix;
LinkerPrivateGlobalPrefix = "";
InlineAsmStart = "APP";
InlineAsmEnd = "NO_APP";
Code16Directive = ".code16";
Code32Directive = ".code32";
Code64Directive = ".code64";
ZeroDirective = "\t.zero\t";
AsciiDirective = "\t.ascii\t";
AscizDirective = "\t.asciz\t";
Data8bitsDirective = "\t.byte\t";
Data16bitsDirective = "\t.short\t";
Data32bitsDirective = "\t.long\t";
Data64bitsDirective = "\t.quad\t";
GlobalDirective = "\t.globl\t";
WeakDirective = "\t.weak\t";
if (DwarfExtendedLoc != Default)
SupportsExtendedDwarfLocDirective = DwarfExtendedLoc == Enable;
if (UseLEB128Directives != cl::BOU_UNSET)
HasLEB128Directives = UseLEB128Directives == cl::BOU_TRUE;
Re-commit: Demote EmitRawText call in AsmPrinter::EmitInlineAsm() and remove hasRawTextSupport() call Summary: AsmPrinter::EmitInlineAsm() will no longer use the EmitRawText() call for targets with mature MC support. Such targets will always parse the inline assembly (even when emitting assembly). Targets without mature MC support continue to use EmitRawText() for assembly output. The hasRawTextSupport() check in AsmPrinter::EmitInlineAsm() has been replaced with MCAsmInfo::UseIntegratedAs which when true, causes the integrated assembler to parse inline assembly (even when emitting assembly output). UseIntegratedAs is set to true for targets that consider any failure to parse valid assembly to be a bug. Target specific subclasses generally enable the integrated assembler in their constructor. The default value can be overridden with -no-integrated-as. All tests that rely on inline assembly supporting invalid assembly (for example, those that use mnemonics such as 'foo' or 'hello world') have been updated to disable the integrated assembler. Changes since review (and last commit attempt): - Fixed test failures that were missed due to configuration of local build. (fixes crash.ll and a couple others). - Fixed tests that happened to pass because the local build was on X86 (should fix 2007-12-17-InvokeAsm.ll) - mature-mc-support.ll's should no longer require all targets to be compiled. (should fix ARM and PPC buildbots) - Object output (-filetype=obj and similar) now forces the integrated assembler to be enabled regardless of default setting or -no-integrated-as. (should fix SystemZ buildbots) Reviewers: rafael Reviewed By: rafael CC: llvm-commits Differential Revision: http://llvm-reviews.chandlerc.com/D2686 llvm-svn: 201333
2014-02-13 22:44:26 +08:00
// 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 = true;
PreserveAsmComments = true;
}
MCAsmInfo::~MCAsmInfo() = default;
void MCAsmInfo::addInitialFrameState(const MCCFIInstruction &Inst) {
InitialFrameState.push_back(Inst);
}
bool MCAsmInfo::isSectionAtomizableBySymbols(const MCSection &Section) const {
return false;
}
const MCExpr *
MCAsmInfo::getExprForPersonalitySymbol(const MCSymbol *Sym,
unsigned Encoding,
MCStreamer &Streamer) const {
return getExprForFDESymbol(Sym, Encoding, Streamer);
}
const MCExpr *
MCAsmInfo::getExprForFDESymbol(const MCSymbol *Sym,
unsigned Encoding,
MCStreamer &Streamer) const {
if (!(Encoding & dwarf::DW_EH_PE_pcrel))
return MCSymbolRefExpr::create(Sym, Streamer.getContext());
MCContext &Context = Streamer.getContext();
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);
}
bool MCAsmInfo::isAcceptableChar(char C) const {
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());
}