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a0057ca13f
expressions used in the FDE to refer to symbols. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130437 91177308-0d34-0410-b5e6-96231b3b80d8
73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
//===-- MCAsmInfoDarwin.cpp - Darwin asm properties -------------*- C++ -*-===//
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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 in general on Darwin-based targets
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCAsmInfoDarwin.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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using namespace llvm;
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MCAsmInfoDarwin::MCAsmInfoDarwin() {
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// Common settings for all Darwin targets.
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// Syntax:
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GlobalPrefix = "_";
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PrivateGlobalPrefix = "L";
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LinkerPrivateGlobalPrefix = "l";
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AllowQuotesInName = true;
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HasSingleParameterDotFile = false;
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HasSubsectionsViaSymbols = true;
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AlignmentIsInBytes = false;
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COMMDirectiveAlignmentIsInBytes = false;
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InlineAsmStart = " InlineAsm Start";
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InlineAsmEnd = " InlineAsm End";
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// Directives:
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WeakDefDirective = "\t.weak_definition ";
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WeakRefDirective = "\t.weak_reference ";
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ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
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HasMachoZeroFillDirective = true; // Uses .zerofill
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HasMachoTBSSDirective = true; // Uses .tbss
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HasStaticCtorDtorReferenceInStaticMode = true;
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// FIXME: Darwin 10 and newer don't need this.
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LinkerRequiresNonEmptyDwarfLines = true;
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// FIXME: Change this once MC is the system assembler.
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HasAggressiveSymbolFolding = false;
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HiddenVisibilityAttr = MCSA_PrivateExtern;
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HiddenDeclarationVisibilityAttr = MCSA_Invalid;
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// Doesn't support protected visibility.
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ProtectedVisibilityAttr = MCSA_Global;
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HasDotTypeDotSizeDirective = false;
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HasNoDeadStrip = true;
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HasSymbolResolver = true;
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DwarfUsesAbsoluteLabelForStmtList = false;
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DwarfUsesLabelOffsetForRanges = false;
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}
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const MCExpr *
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MCAsmInfoDarwin::getExprForFDESymbol(const MCSymbol *Sym,
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MCStreamer &Streamer) const {
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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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