TargetLoweringObjectFile.cpp revision 35039ac24163e99cfab161620a9fb41f944a63d5
1f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner//===-- llvm/Target/TargetLoweringObjectFile.cpp - Object File Info -------===// 2f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner// 3f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner// The LLVM Compiler Infrastructure 4f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner// 5f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner// This file is distributed under the University of Illinois Open Source 6f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner// License. See LICENSE.TXT for details. 7f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner// 8f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner//===----------------------------------------------------------------------===// 9f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner// 10f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner// This file implements classes used to handle lowerings specific to common 11f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner// object file formats. 12f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner// 13f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner//===----------------------------------------------------------------------===// 14f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 15f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner#include "llvm/Target/TargetLoweringObjectFile.h" 16f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner#include "llvm/Constants.h" 17f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner#include "llvm/DerivedTypes.h" 18f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner#include "llvm/GlobalVariable.h" 19a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattner#include "llvm/MC/MCContext.h" 20a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattner#include "llvm/MC/MCSection.h" 21f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner#include "llvm/Target/TargetMachine.h" 22f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner#include "llvm/Target/TargetData.h" 23f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner#include "llvm/Target/TargetOptions.h" 24a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattner#include "llvm/Support/Mangler.h" 25f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner#include "llvm/ADT/StringExtras.h" 26f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattnerusing namespace llvm; 27f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 28f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner//===----------------------------------------------------------------------===// 29f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner// Generic Code 30f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner//===----------------------------------------------------------------------===// 31f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 32a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris LattnerTargetLoweringObjectFile::TargetLoweringObjectFile() : Ctx(0) { 33f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner TextSection = 0; 34f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner DataSection = 0; 35824583844a8f334dd261894a3fac7ad476531667Chris Lattner BSSSection = 0; 36f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner ReadOnlySection = 0; 3780ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner StaticCtorSection = 0; 3880ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner StaticDtorSection = 0; 39d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner LSDASection = 0; 4035039ac24163e99cfab161620a9fb41f944a63d5Chris Lattner EHFrameSection = 0; 41f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 42f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 43f0144127b98425d214e59e4a1a4b342b78e3642bChris LattnerTargetLoweringObjectFile::~TargetLoweringObjectFile() { 44f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 45f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 46f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattnerstatic bool isSuitableForBSS(const GlobalVariable *GV) { 47f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Constant *C = GV->getInitializer(); 48f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 49f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Must have zero initializer. 50f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (!C->isNullValue()) 51f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return false; 52f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 53f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Leave constant zeros in readonly constant sections, so they can be shared. 54f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (GV->isConstant()) 55f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return false; 56f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 57f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // If the global has an explicit section specified, don't put it in BSS. 58f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (!GV->getSection().empty()) 59f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return false; 60f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 61f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // If -nozero-initialized-in-bss is specified, don't ever use BSS. 62f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (NoZerosInBSS) 63f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return false; 64f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 65f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Otherwise, put it in BSS! 66f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return true; 67f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 68f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 69f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattnerstatic bool isConstantString(const Constant *C) { 70f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // First check: is we have constant array of i8 terminated with zero 71f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner const ConstantArray *CVA = dyn_cast<ConstantArray>(C); 72f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Check, if initializer is a null-terminated string 73f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (CVA && CVA->isCString()) 74f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return true; 75f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 76f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Another possibility: [1 x i8] zeroinitializer 77f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (isa<ConstantAggregateZero>(C)) 78f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (const ArrayType *Ty = dyn_cast<ArrayType>(C->getType())) 79f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return (Ty->getElementType() == Type::Int8Ty && 80f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Ty->getNumElements() == 1); 81f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 82f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return false; 83f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 84f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 85968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner/// SectionKindForGlobal - This is a top-level target-independent classifier for 86968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner/// a global variable. Given an global variable and information from TM, it 87968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner/// classifies the global in a variety of ways that make various target 88968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner/// implementations simpler. The target implementation is free to ignore this 89968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner/// extra info of course. 90968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattnerstatic SectionKind SectionKindForGlobal(const GlobalValue *GV, 91968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner const TargetMachine &TM) { 92f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Reloc::Model ReloModel = TM.getRelocationModel(); 93f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 94f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Early exit - functions should be always in text sections. 95f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV); 96f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (GVar == 0) 972798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getText(); 98f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 99f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 100f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Handle thread-local data first. 101f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (GVar->isThreadLocal()) { 102f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (isSuitableForBSS(GVar)) 1032798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getThreadBSS(); 1042798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getThreadData(); 105f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } 106f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 107f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Variable can be easily put to BSS section. 108f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (isSuitableForBSS(GVar)) 1092798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getBSS(); 110f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 111f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Constant *C = GVar->getInitializer(); 112f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 113f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // If the global is marked constant, we can put it into a mergable section, 114f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // a mergable string section, or general .data if it contains relocations. 115f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (GVar->isConstant()) { 116f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // If the initializer for the global contains something that requires a 117f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // relocation, then we may have to drop this into a wriable data section 118f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // even though it is marked const. 119f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner switch (C->getRelocationInfo()) { 120f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner default: llvm_unreachable("unknown relocation info kind"); 121f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner case Constant::NoRelocation: 122f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // If initializer is a null-terminated string, put it in a "cstring" 123f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // section if the target has it. 124f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (isConstantString(C)) 1252798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getMergeableCString(); 126f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 127f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Otherwise, just drop it into a mergable constant section. If we have 128f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // a section for this size, use it, otherwise use the arbitrary sized 129f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // mergable section. 130f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner switch (TM.getTargetData()->getTypeAllocSize(C->getType())) { 1312798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner case 4: return SectionKind::getMergeableConst4(); 1322798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner case 8: return SectionKind::getMergeableConst8(); 1332798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner case 16: return SectionKind::getMergeableConst16(); 1342798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner default: return SectionKind::getMergeableConst(); 135f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } 136f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 137f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner case Constant::LocalRelocation: 138f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // In static relocation model, the linker will resolve all addresses, so 139f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // the relocation entries will actually be constants by the time the app 140f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // starts up. However, we can't put this into a mergable section, because 141f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // the linker doesn't take relocations into consideration when it tries to 142f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // merge entries in the section. 143f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (ReloModel == Reloc::Static) 1442798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getReadOnly(); 145f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 146f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Otherwise, the dynamic linker needs to fix it up, put it in the 147f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // writable data.rel.local section. 1482798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getReadOnlyWithRelLocal(); 149f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 150f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner case Constant::GlobalRelocations: 151f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // In static relocation model, the linker will resolve all addresses, so 152f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // the relocation entries will actually be constants by the time the app 153f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // starts up. However, we can't put this into a mergable section, because 154f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // the linker doesn't take relocations into consideration when it tries to 155f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // merge entries in the section. 156f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (ReloModel == Reloc::Static) 1572798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getReadOnly(); 158f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 159f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Otherwise, the dynamic linker needs to fix it up, put it in the 160f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // writable data.rel section. 1612798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getReadOnlyWithRel(); 162f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } 163f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } 164f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 165f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Okay, this isn't a constant. If the initializer for the global is going 166f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // to require a runtime relocation by the dynamic linker, put it into a more 167f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // specific section to improve startup time of the app. This coalesces these 168f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // globals together onto fewer pages, improving the locality of the dynamic 169f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // linker. 170f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (ReloModel == Reloc::Static) 1712798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getDataNoRel(); 172f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 173f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner switch (C->getRelocationInfo()) { 174f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner default: llvm_unreachable("unknown relocation info kind"); 175f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner case Constant::NoRelocation: 1762798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getDataNoRel(); 177f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner case Constant::LocalRelocation: 1782798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getDataRelLocal(); 179f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner case Constant::GlobalRelocations: 1802798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getDataRel(); 181f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } 182f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 183f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 184f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner/// SectionForGlobal - This method computes the appropriate section to emit 185f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner/// the specified global variable or function definition. This should not 186f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner/// be passed external (or available externally) globals. 187a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattnerconst MCSection *TargetLoweringObjectFile:: 188e53a600f065075731d0aeb9dc8f4f3d75f5a05f8Chris LattnerSectionForGlobal(const GlobalValue *GV, Mangler *Mang, 189e53a600f065075731d0aeb9dc8f4f3d75f5a05f8Chris Lattner const TargetMachine &TM) const { 190f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner assert(!GV->isDeclaration() && !GV->hasAvailableExternallyLinkage() && 191f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner "Can only be used for global definitions"); 192f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 193968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner SectionKind Kind = SectionKindForGlobal(GV, TM); 194f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 195f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Select section name. 196f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (GV->hasSection()) { 197f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // If the target has special section hacks for specifically named globals, 198f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // return them now. 199f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (const MCSection *TS = getSpecialCasedSectionGlobals(GV, Mang, Kind)) 200f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return TS; 201f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 202f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // If the target has magic semantics for certain section names, make sure to 203f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // pick up the flags. This allows the user to write things with attribute 204f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // section and still get the appropriate section flags printed. 205968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner Kind = getKindForNamedSection(GV->getSection().c_str(), Kind); 206f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 207968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner return getOrCreateSection(GV->getSection().c_str(), false, Kind); 208f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } 209f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 210f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 211f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Use default section depending on the 'type' of global 212f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner return SelectSectionForGlobal(GV, Kind, Mang, TM); 213f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 214f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 215f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner// Lame default implementation. Calculate the section name for global. 216a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattnerconst MCSection * 217f0144127b98425d214e59e4a1a4b342b78e3642bChris LattnerTargetLoweringObjectFile::SelectSectionForGlobal(const GlobalValue *GV, 218f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner SectionKind Kind, 219e53a600f065075731d0aeb9dc8f4f3d75f5a05f8Chris Lattner Mangler *Mang, 220f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner const TargetMachine &TM) const{ 221f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner assert(!Kind.isThreadLocal() && "Doesn't support TLS"); 222f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 223f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isText()) 224f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return getTextSection(); 225f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 226824583844a8f334dd261894a3fac7ad476531667Chris Lattner if (Kind.isBSS() && BSSSection != 0) 227824583844a8f334dd261894a3fac7ad476531667Chris Lattner return BSSSection; 228f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 229f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isReadOnly() && ReadOnlySection != 0) 230f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return ReadOnlySection; 231f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 232f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return getDataSection(); 233f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 234f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 23583d77faf6e8fc2c1c2377d037283dc162d8667a1Chris Lattner/// getSectionForConstant - Given a mergable constant with the 236f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner/// specified size and relocation information, return a section that it 237f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner/// should be placed in. 238a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattnerconst MCSection * 23983d77faf6e8fc2c1c2377d037283dc162d8667a1Chris LattnerTargetLoweringObjectFile::getSectionForConstant(SectionKind Kind) const { 240f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isReadOnly() && ReadOnlySection != 0) 241f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return ReadOnlySection; 242f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 243f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return DataSection; 244f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 245f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 246f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 247a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattnerconst MCSection *TargetLoweringObjectFile:: 248968ff1196768c0b6dbcc5508025a2923bfa73fabChris LattnergetOrCreateSection(const char *Name, bool isDirective, SectionKind Kind) const { 249a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattner if (MCSection *S = Ctx->GetSection(Name)) 250a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattner return S; 251968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner return MCSection::Create(Name, isDirective, Kind, *Ctx); 252f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 253f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 254f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 255f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 256f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner//===----------------------------------------------------------------------===// 257f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner// ELF 258f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner//===----------------------------------------------------------------------===// 259f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 260f26e03bc7e30162197641406e37e662a15d80f7eChris Lattnervoid TargetLoweringObjectFileELF::Initialize(MCContext &Ctx, 261f26e03bc7e30162197641406e37e662a15d80f7eChris Lattner const TargetMachine &TM) { 262a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattner TargetLoweringObjectFile::Initialize(Ctx, TM); 263f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (!HasCrazyBSS) 2642798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner BSSSection = getOrCreateSection("\t.bss", true, SectionKind::getBSS()); 265f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner else 266f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // PPC/Linux doesn't support the .bss directive, it needs .section .bss. 267f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // FIXME: Does .section .bss work everywhere?? 268968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner // FIXME2: this should just be handle by the section printer. We should get 269968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner // away from syntactic view of the sections and MCSection should just be a 270968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner // semantic view. 2712798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner BSSSection = getOrCreateSection("\t.bss", false, SectionKind::getBSS()); 272f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 273f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 2742798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner TextSection = getOrCreateSection("\t.text", true, SectionKind::getText()); 2752798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner DataSection = getOrCreateSection("\t.data", true, SectionKind::getDataRel()); 276f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner ReadOnlySection = 2772798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner getOrCreateSection("\t.rodata", false, SectionKind::getReadOnly()); 278f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner TLSDataSection = 2792798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner getOrCreateSection("\t.tdata", false, SectionKind::getThreadData()); 280824583844a8f334dd261894a3fac7ad476531667Chris Lattner CStringSection = getOrCreateSection("\t.rodata.str", true, 2812798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getMergeableCString()); 282f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 283968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner TLSBSSSection = getOrCreateSection("\t.tbss", false, 2842798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getThreadBSS()); 285f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 286f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner DataRelSection = getOrCreateSection("\t.data.rel", false, 2872798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getDataRel()); 288f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner DataRelLocalSection = getOrCreateSection("\t.data.rel.local", false, 2892798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getDataRelLocal()); 290f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner DataRelROSection = getOrCreateSection("\t.data.rel.ro", false, 2912798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getReadOnlyWithRel()); 292f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner DataRelROLocalSection = 293f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner getOrCreateSection("\t.data.rel.ro.local", false, 2942798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getReadOnlyWithRelLocal()); 295f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 296f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner MergeableConst4Section = getOrCreateSection(".rodata.cst4", false, 2972798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getMergeableConst4()); 298f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner MergeableConst8Section = getOrCreateSection(".rodata.cst8", false, 2992798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getMergeableConst8()); 300f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner MergeableConst16Section = getOrCreateSection(".rodata.cst16", false, 3012798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getMergeableConst16()); 30280ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner 30380ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner StaticCtorSection = 30480ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner getOrCreateSection(".ctors", false, SectionKind::getDataRel()); 30580ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner StaticDtorSection = 30680ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner getOrCreateSection(".dtors", false, SectionKind::getDataRel()); 307d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner 308d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner 309d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 310d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner // it contains relocatable pointers. In PIC mode, this is probably a big 311d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner // runtime hit for C++ apps. Either the contents of the LSDA need to be 312d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner // adjusted or this should be a data section. 313d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner LSDASection = 314d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner getOrCreateSection(".gcc_except_table", false, SectionKind::getReadOnly()); 31535039ac24163e99cfab161620a9fb41f944a63d5Chris Lattner EHFrameSection = 31635039ac24163e99cfab161620a9fb41f944a63d5Chris Lattner getOrCreateSection(".eh_frame", false, SectionKind::getDataRel()); 317f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 318f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 319f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 320968ff1196768c0b6dbcc5508025a2923bfa73fabChris LattnerSectionKind TargetLoweringObjectFileELF:: 321968ff1196768c0b6dbcc5508025a2923bfa73fabChris LattnergetKindForNamedSection(const char *Name, SectionKind K) const { 322f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Name[0] != '.') return K; 323f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 324f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Some lame default implementation based on some magic section names. 325f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (strncmp(Name, ".gnu.linkonce.b.", 16) == 0 || 326f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner strncmp(Name, ".llvm.linkonce.b.", 17) == 0 || 327f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner strncmp(Name, ".gnu.linkonce.sb.", 17) == 0 || 328f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner strncmp(Name, ".llvm.linkonce.sb.", 18) == 0) 3292798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getBSS(); 330f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 331f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (strcmp(Name, ".tdata") == 0 || 332f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner strncmp(Name, ".tdata.", 7) == 0 || 333f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner strncmp(Name, ".gnu.linkonce.td.", 17) == 0 || 334f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner strncmp(Name, ".llvm.linkonce.td.", 18) == 0) 3352798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getThreadData(); 336f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 337f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (strcmp(Name, ".tbss") == 0 || 338f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner strncmp(Name, ".tbss.", 6) == 0 || 339f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner strncmp(Name, ".gnu.linkonce.tb.", 17) == 0 || 340f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner strncmp(Name, ".llvm.linkonce.tb.", 18) == 0) 3412798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner return SectionKind::getThreadBSS(); 342f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 343f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return K; 344f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 345f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 346f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattnervoid TargetLoweringObjectFileELF:: 347f0144127b98425d214e59e4a1a4b342b78e3642bChris LattnergetSectionFlagsAsString(SectionKind Kind, SmallVectorImpl<char> &Str) const { 348f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back(','); 349f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back('"'); 350f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 351f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (!Kind.isMetadata()) 352f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back('a'); 353f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isText()) 354f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back('x'); 355f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isWriteable()) 356f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back('w'); 35782987bfe9b6ae85a8836c9f2d2e9f0ef9866edb1Chris Lattner if (Kind.isMergeableCString() || 35882987bfe9b6ae85a8836c9f2d2e9f0ef9866edb1Chris Lattner Kind.isMergeableConst4() || 35982987bfe9b6ae85a8836c9f2d2e9f0ef9866edb1Chris Lattner Kind.isMergeableConst8() || 36082987bfe9b6ae85a8836c9f2d2e9f0ef9866edb1Chris Lattner Kind.isMergeableConst16()) 361f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back('M'); 362f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isMergeableCString()) 363f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back('S'); 364f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isThreadLocal()) 365f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back('T'); 366f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 367f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back('"'); 368f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back(','); 369f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 370f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // If comment string is '@', e.g. as on ARM - use '%' instead 371f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (AtIsCommentChar) 372f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back('%'); 373f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner else 374f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back('@'); 375f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 376f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner const char *KindStr; 377bf15e433b9ac6692e76aff0465cd93bb87f68989Chris Lattner if (Kind.isBSS() || Kind.isThreadBSS()) 378f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner KindStr = "nobits"; 379f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner else 380f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner KindStr = "progbits"; 381f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 382f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.append(KindStr, KindStr+strlen(KindStr)); 383f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 384f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isMergeableCString()) { 385f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // TODO: Eventually handle multiple byte character strings. For now, all 386f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // mergable C strings are single byte. 387f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back(','); 388f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back('1'); 389f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } else if (Kind.isMergeableConst4()) { 390f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back(','); 391f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back('4'); 392f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } else if (Kind.isMergeableConst8()) { 393f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back(','); 394f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back('8'); 395f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } else if (Kind.isMergeableConst16()) { 396f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back(','); 397f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back('1'); 398f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.push_back('6'); 399f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } 400f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 401f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 402f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 403f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattnerstatic const char *getSectionPrefixForUniqueGlobal(SectionKind Kind) { 404f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isText()) return ".gnu.linkonce.t."; 405f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isReadOnly()) return ".gnu.linkonce.r."; 406f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 407f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isThreadData()) return ".gnu.linkonce.td."; 408f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isThreadBSS()) return ".gnu.linkonce.tb."; 409f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 410f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isBSS()) return ".gnu.linkonce.b."; 411f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isDataNoRel()) return ".gnu.linkonce.d."; 412f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isDataRelLocal()) return ".gnu.linkonce.d.rel.local."; 413f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isDataRel()) return ".gnu.linkonce.d.rel."; 414f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isReadOnlyWithRelLocal()) return ".gnu.linkonce.d.rel.ro.local."; 415f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 416f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); 417f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return ".gnu.linkonce.d.rel.ro."; 418f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 419f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 420a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattnerconst MCSection *TargetLoweringObjectFileELF:: 421f9650c061ee89ac55740555530ca5c2842c28738Chris LattnerSelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, 422e53a600f065075731d0aeb9dc8f4f3d75f5a05f8Chris Lattner Mangler *Mang, const TargetMachine &TM) const { 423f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 424f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // If this global is linkonce/weak and the target handles this by emitting it 425f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // into a 'uniqued' section name, create and return the section now. 42627602b82c2a12b9f99c1f7fcbfb4be5ba97dbd7dChris Lattner if (GV->isWeakForLinker()) { 427f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner const char *Prefix = getSectionPrefixForUniqueGlobal(Kind); 428b8f396bdbb06b585b480ada31ec8c2ab35916a55Chris Lattner std::string Name = Mang->makeNameProper(GV->getNameStr()); 429f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner return getOrCreateSection((Prefix+Name).c_str(), false, Kind); 430f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } 431f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 432f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isText()) return TextSection; 433e53a600f065075731d0aeb9dc8f4f3d75f5a05f8Chris Lattner 434f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isMergeableCString()) { 435824583844a8f334dd261894a3fac7ad476531667Chris Lattner assert(CStringSection && "Should have string section prefix"); 436f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 437067fe1ae5488764afb8d8fdafba65899dc221887Chris Lattner // We also need alignment here. 438067fe1ae5488764afb8d8fdafba65899dc221887Chris Lattner // FIXME: this is getting the alignment of the character, not the 439067fe1ae5488764afb8d8fdafba65899dc221887Chris Lattner // alignment of the global! 440067fe1ae5488764afb8d8fdafba65899dc221887Chris Lattner unsigned Align = 441067fe1ae5488764afb8d8fdafba65899dc221887Chris Lattner TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV)); 442f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 443824583844a8f334dd261894a3fac7ad476531667Chris Lattner std::string Name = CStringSection->getName() + "1." + utostr(Align); 444067fe1ae5488764afb8d8fdafba65899dc221887Chris Lattner return getOrCreateSection(Name.c_str(), false, 4452798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getMergeableCString()); 446f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } 447f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 448f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isMergeableConst()) { 449f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isMergeableConst4()) 450f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return MergeableConst4Section; 451f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isMergeableConst8()) 452f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return MergeableConst8Section; 453f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isMergeableConst16()) 454f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return MergeableConst16Section; 455f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return ReadOnlySection; // .const 456f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } 457f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 458f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isReadOnly()) return ReadOnlySection; 459f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 460f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isThreadData()) return TLSDataSection; 461f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isThreadBSS()) return TLSBSSSection; 462f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 463824583844a8f334dd261894a3fac7ad476531667Chris Lattner if (Kind.isBSS()) return BSSSection; 464f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 465f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isDataNoRel()) return DataSection; 466f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isDataRelLocal()) return DataRelLocalSection; 467f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isDataRel()) return DataRelSection; 468f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection; 469f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 470f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); 471f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return DataRelROSection; 472f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 473f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 47483d77faf6e8fc2c1c2377d037283dc162d8667a1Chris Lattner/// getSectionForConstant - Given a mergeable constant with the 475f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner/// specified size and relocation information, return a section that it 476f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner/// should be placed in. 477a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattnerconst MCSection *TargetLoweringObjectFileELF:: 47883d77faf6e8fc2c1c2377d037283dc162d8667a1Chris LattnergetSectionForConstant(SectionKind Kind) const { 479f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isMergeableConst4()) 480f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return MergeableConst4Section; 481f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isMergeableConst8()) 482f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return MergeableConst8Section; 483f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isMergeableConst16()) 484f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return MergeableConst16Section; 485f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isReadOnly()) 486f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return ReadOnlySection; 487f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 488f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection; 489f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); 490f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return DataRelROSection; 491f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 492f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 493f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner//===----------------------------------------------------------------------===// 494f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner// MachO 495f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner//===----------------------------------------------------------------------===// 496f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 497f26e03bc7e30162197641406e37e662a15d80f7eChris Lattnervoid TargetLoweringObjectFileMachO::Initialize(MCContext &Ctx, 498f26e03bc7e30162197641406e37e662a15d80f7eChris Lattner const TargetMachine &TM) { 499a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattner TargetLoweringObjectFile::Initialize(Ctx, TM); 500968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner TextSection = getOrCreateSection("\t.text", true, 5012798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getText()); 502968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner DataSection = getOrCreateSection("\t.data", true, 5032798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getDataRel()); 504f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 505824583844a8f334dd261894a3fac7ad476531667Chris Lattner CStringSection = getOrCreateSection("\t.cstring", true, 5062798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getMergeableCString()); 507f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner FourByteConstantSection = getOrCreateSection("\t.literal4\n", true, 5082798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getMergeableConst4()); 509f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner EightByteConstantSection = getOrCreateSection("\t.literal8\n", true, 5102798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getMergeableConst8()); 5114bb253c60f895131371aa2ad1bfa5a2bea213f78Chris Lattner 5124bb253c60f895131371aa2ad1bfa5a2bea213f78Chris Lattner // ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back 5134bb253c60f895131371aa2ad1bfa5a2bea213f78Chris Lattner // to using it in -static mode. 5144bb253c60f895131371aa2ad1bfa5a2bea213f78Chris Lattner if (TM.getRelocationModel() != Reloc::Static && 5154bb253c60f895131371aa2ad1bfa5a2bea213f78Chris Lattner TM.getTargetData()->getPointerSize() == 32) 5164bb253c60f895131371aa2ad1bfa5a2bea213f78Chris Lattner SixteenByteConstantSection = 517968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner getOrCreateSection("\t.literal16\n", true, 5182798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getMergeableConst16()); 5194bb253c60f895131371aa2ad1bfa5a2bea213f78Chris Lattner else 5204bb253c60f895131371aa2ad1bfa5a2bea213f78Chris Lattner SixteenByteConstantSection = 0; 521f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 522968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner ReadOnlySection = getOrCreateSection("\t.const", true, 5232798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getReadOnly()); 524f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 525f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner TextCoalSection = 526f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner getOrCreateSection("\t__TEXT,__textcoal_nt,coalesced,pure_instructions", 5272798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner false, SectionKind::getText()); 528f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner ConstTextCoalSection = getOrCreateSection("\t__TEXT,__const_coal,coalesced", 529968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner false, 5302798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getText()); 531f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner ConstDataCoalSection = getOrCreateSection("\t__DATA,__const_coal,coalesced", 532968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner false, 5332798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getText()); 534f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner ConstDataSection = getOrCreateSection("\t.const_data", true, 5352798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getReadOnlyWithRel()); 536f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner DataCoalSection = getOrCreateSection("\t__DATA,__datacoal_nt,coalesced", 537968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner false, 5382798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getDataRel()); 53980ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner 54080ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner if (TM.getRelocationModel() == Reloc::Static) { 54180ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner StaticCtorSection = 54280ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner getOrCreateSection(".constructor", true, SectionKind::getDataRel()); 54380ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner StaticDtorSection = 54480ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner getOrCreateSection(".destructor", true, SectionKind::getDataRel()); 54580ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner } else { 54680ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner StaticCtorSection = 54780ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner getOrCreateSection(".mod_init_func", true, SectionKind::getDataRel()); 54880ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner StaticDtorSection = 54980ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner getOrCreateSection(".mod_term_func", true, SectionKind::getDataRel()); 55080ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner } 55180ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner 552d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner LSDASection = getOrCreateSection("__DATA,__gcc_except_tab", false, 553d5bbb07ec806e6fa1e804afd7073987fdacc83e4Chris Lattner SectionKind::getDataRel()); 55435039ac24163e99cfab161620a9fb41f944a63d5Chris Lattner EHFrameSection = 55535039ac24163e99cfab161620a9fb41f944a63d5Chris Lattner getOrCreateSection("__TEXT,__eh_frame,coalesced,no_toc+strip_static_syms" 55635039ac24163e99cfab161620a9fb41f944a63d5Chris Lattner "+live_support", false, SectionKind::getReadOnly()); 557f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 558f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 559a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattnerconst MCSection *TargetLoweringObjectFileMachO:: 560f9650c061ee89ac55740555530ca5c2842c28738Chris LattnerSelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, 561e53a600f065075731d0aeb9dc8f4f3d75f5a05f8Chris Lattner Mangler *Mang, const TargetMachine &TM) const { 562f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner assert(!Kind.isThreadLocal() && "Darwin doesn't support TLS"); 563f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 564f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isText()) 56527602b82c2a12b9f99c1f7fcbfb4be5ba97dbd7dChris Lattner return GV->isWeakForLinker() ? TextCoalSection : TextSection; 566f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 567f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // If this is weak/linkonce, put this in a coalescable section, either in text 568f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // or data depending on if it is writable. 56927602b82c2a12b9f99c1f7fcbfb4be5ba97dbd7dChris Lattner if (GV->isWeakForLinker()) { 570f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isReadOnly()) 571f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return ConstTextCoalSection; 572f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return DataCoalSection; 573f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } 574f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 575f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // FIXME: Alignment check should be handled by section classifier. 576f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isMergeableCString()) { 577f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Constant *C = cast<GlobalVariable>(GV)->getInitializer(); 578f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner const Type *Ty = cast<ArrayType>(C->getType())->getElementType(); 579f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner const TargetData &TD = *TM.getTargetData(); 580f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner unsigned Size = TD.getTypeAllocSize(Ty); 581f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Size) { 582f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner unsigned Align = TD.getPreferredAlignment(cast<GlobalVariable>(GV)); 583f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Align <= 32) 584824583844a8f334dd261894a3fac7ad476531667Chris Lattner return CStringSection; 585f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } 586f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 587f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return ReadOnlySection; 588f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } 589f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 590f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isMergeableConst()) { 591f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isMergeableConst4()) 592f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return FourByteConstantSection; 593f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isMergeableConst8()) 594f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return EightByteConstantSection; 595f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isMergeableConst16() && SixteenByteConstantSection) 596f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return SixteenByteConstantSection; 597f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return ReadOnlySection; // .const 598f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } 599f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 600f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // FIXME: ROData -> const in -static mode that is relocatable but they happen 601f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // by the static linker. Why not mergeable? 602f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isReadOnly()) 603f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return ReadOnlySection; 604f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 605f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // If this is marked const, put it into a const section. But if the dynamic 606f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // linker needs to write to it, put it in the data segment. 607f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isReadOnlyWithRel()) 608f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return ConstDataSection; 609f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 610f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // Otherwise, just drop the variable in the normal data section. 611f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return DataSection; 612f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 613f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 614a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattnerconst MCSection * 61583d77faf6e8fc2c1c2377d037283dc162d8667a1Chris LattnerTargetLoweringObjectFileMachO::getSectionForConstant(SectionKind Kind) const { 616f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // If this constant requires a relocation, we have to put it in the data 617f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // segment, not in the text segment. 618f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isDataRel()) 619f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return ConstDataSection; 620f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 621f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isMergeableConst4()) 622f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return FourByteConstantSection; 623f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isMergeableConst8()) 624f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return EightByteConstantSection; 6254bb253c60f895131371aa2ad1bfa5a2bea213f78Chris Lattner if (Kind.isMergeableConst16() && SixteenByteConstantSection) 626f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return SixteenByteConstantSection; 627f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return ReadOnlySection; // .const 628f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 629f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 63026630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner/// shouldEmitUsedDirectiveFor - This hook allows targets to selectively decide 63126630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner/// not to emit the UsedDirective for some symbols in llvm.used. 63226630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner// FIXME: REMOVE this (rdar://7071300) 63326630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattnerbool TargetLoweringObjectFileMachO:: 63426630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris LattnershouldEmitUsedDirectiveFor(const GlobalValue *GV, Mangler *Mang) const { 63526630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner /// On Darwin, internally linked data beginning with "L" or "l" does not have 63626630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner /// the directive emitted (this occurs in ObjC metadata). 63726630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner if (!GV) return false; 63826630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner 63926630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner // Check whether the mangled name has the "Private" or "LinkerPrivate" prefix. 64026630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner if (GV->hasLocalLinkage() && !isa<Function>(GV)) { 64126630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner // FIXME: ObjC metadata is currently emitted as internal symbols that have 64226630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner // \1L and \0l prefixes on them. Fix them to be Private/LinkerPrivate and 64326630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner // this horrible hack can go away. 64426630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner const std::string &Name = Mang->getMangledName(GV); 64526630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner if (Name[0] == 'L' || Name[0] == 'l') 64626630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner return false; 64726630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner } 64826630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner 64926630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner return true; 65026630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner} 65126630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner 65226630c1180502d07c9b2b4a9a4ba06bc5ddf180bChris Lattner 653f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner//===----------------------------------------------------------------------===// 654f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner// COFF 655f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner//===----------------------------------------------------------------------===// 656f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 657f26e03bc7e30162197641406e37e662a15d80f7eChris Lattnervoid TargetLoweringObjectFileCOFF::Initialize(MCContext &Ctx, 658f26e03bc7e30162197641406e37e662a15d80f7eChris Lattner const TargetMachine &TM) { 659a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattner TargetLoweringObjectFile::Initialize(Ctx, TM); 660968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner TextSection = getOrCreateSection("\t.text", true, 6612798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getText()); 662968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner DataSection = getOrCreateSection("\t.data", true, 6632798119ab4d7e0b42812b3acdf37821f40dee627Chris Lattner SectionKind::getDataRel()); 66480ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner StaticCtorSection = 66580ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner getOrCreateSection(".ctors", false, SectionKind::getDataRel()); 66680ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner StaticDtorSection = 66780ec2792b2b271eca55743a3cc4c8bca214fa705Chris Lattner getOrCreateSection(".dtors", false, SectionKind::getDataRel()); 668f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 669f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 670f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattnervoid TargetLoweringObjectFileCOFF:: 671f0144127b98425d214e59e4a1a4b342b78e3642bChris LattnergetSectionFlagsAsString(SectionKind Kind, SmallVectorImpl<char> &Str) const { 672f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // FIXME: Inefficient. 673f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner std::string Res = ",\""; 674f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isText()) 675f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Res += 'x'; 676f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isWriteable()) 677f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Res += 'w'; 678f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Res += "\""; 679f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 680f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner Str.append(Res.begin(), Res.end()); 681f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 682f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 683f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattnerstatic const char *getCOFFSectionPrefixForUniqueGlobal(SectionKind Kind) { 684f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isText()) 685f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return ".text$linkonce"; 686f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner if (Kind.isWriteable()) 687f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return ".data$linkonce"; 688f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return ".rdata$linkonce"; 689f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 690f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 691f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 692a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattnerconst MCSection *TargetLoweringObjectFileCOFF:: 693f9650c061ee89ac55740555530ca5c2842c28738Chris LattnerSelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, 694e53a600f065075731d0aeb9dc8f4f3d75f5a05f8Chris Lattner Mangler *Mang, const TargetMachine &TM) const { 695f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner assert(!Kind.isThreadLocal() && "Doesn't support TLS"); 696f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 697f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // If this global is linkonce/weak and the target handles this by emitting it 698f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner // into a 'uniqued' section name, create and return the section now. 69927602b82c2a12b9f99c1f7fcbfb4be5ba97dbd7dChris Lattner if (GV->isWeakForLinker()) { 700f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner const char *Prefix = getCOFFSectionPrefixForUniqueGlobal(Kind); 701968ff1196768c0b6dbcc5508025a2923bfa73fabChris Lattner std::string Name = Mang->makeNameProper(GV->getNameStr()); 702f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner return getOrCreateSection((Prefix+Name).c_str(), false, Kind); 703f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner } 704f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 705f9650c061ee89ac55740555530ca5c2842c28738Chris Lattner if (Kind.isText()) 706f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return getTextSection(); 707f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 708f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner return getDataSection(); 709f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner} 710f0144127b98425d214e59e4a1a4b342b78e3642bChris Lattner 711