forked from OSchip/llvm-project
102 lines
3.8 KiB
C++
102 lines
3.8 KiB
C++
//===-- DarwinTargetAsmInfo.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/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Target/DarwinTargetAsmInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetData.h"
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using namespace llvm;
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DarwinTargetAsmInfo::DarwinTargetAsmInfo(const TargetMachine &TM)
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: TargetAsmInfo(TM) {
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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"; // Marker for some ObjC metadata
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NeedsSet = true;
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NeedsIndirectEncoding = true;
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AllowQuotesInName = true;
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HasSingleParameterDotFile = false;
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// In non-PIC modes, emit a special label before jump tables so that the
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// linker can perform more accurate dead code stripping. We do not check the
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// relocation model here since it can be overridden later.
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JumpTableSpecialLabelPrefix = "l";
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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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HiddenDirective = "\t.private_extern ";
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// Sections:
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CStringSection = "\t.cstring";
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JumpTableDataSection = "\t.const";
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BSSSection = 0;
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if (TM.getRelocationModel() == Reloc::Static) {
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StaticCtorsSection = ".constructor";
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StaticDtorsSection = ".destructor";
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} else {
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StaticCtorsSection = ".mod_init_func";
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StaticDtorsSection = ".mod_term_func";
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}
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// _foo.eh symbols are currently always exported so that the linker knows
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// about them. This may not strictly be necessary on 10.6 and later, but it
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// doesn't hurt anything.
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Is_EHSymbolPrivate = false;
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DwarfAbbrevSection = ".section __DWARF,__debug_abbrev,regular,debug";
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DwarfInfoSection = ".section __DWARF,__debug_info,regular,debug";
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DwarfLineSection = ".section __DWARF,__debug_line,regular,debug";
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DwarfFrameSection = ".section __DWARF,__debug_frame,regular,debug";
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DwarfPubNamesSection = ".section __DWARF,__debug_pubnames,regular,debug";
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DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes,regular,debug";
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DwarfStrSection = ".section __DWARF,__debug_str,regular,debug";
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DwarfLocSection = ".section __DWARF,__debug_loc,regular,debug";
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DwarfARangesSection = ".section __DWARF,__debug_aranges,regular,debug";
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DwarfRangesSection = ".section __DWARF,__debug_ranges,regular,debug";
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DwarfMacroInfoSection = ".section __DWARF,__debug_macinfo,regular,debug";
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}
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/// emitUsedDirectiveFor - On Darwin, internally linked data beginning with
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/// the PrivateGlobalPrefix or the LinkerPrivateGlobalPrefix does not have the
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/// directive emitted (this occurs in ObjC metadata).
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bool DarwinTargetAsmInfo::emitUsedDirectiveFor(const GlobalValue* GV,
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Mangler *Mang) const {
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if (!GV) return false;
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// Check whether the mangled name has the "Private" or "LinkerPrivate" prefix.
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if (GV->hasLocalLinkage() && !isa<Function>(GV)) {
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// FIXME: ObjC metadata is currently emitted as internal symbols that have
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// \1L and \0l prefixes on them. Fix them to be Private/LinkerPrivate and
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// this horrible hack can go away.
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const std::string &Name = Mang->getMangledName(GV);
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if (Name[0] == 'L' || Name[0] == 'l')
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return false;
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}
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return true;
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}
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