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Chris Lattner2eff5052010-03-12 18:44:54 +00001//===-- LTOModule.cpp - LLVM Link Time Optimizer --------------------------===//
Nick Kledzik07b4a622008-02-26 20:26:43 +00002//
Chandler Carruth2946cd72019-01-19 08:50:56 +00003// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
Daniel Dunbar5657e7b2010-08-10 23:46:39 +00006//
Nick Kledzik07b4a622008-02-26 20:26:43 +00007//===----------------------------------------------------------------------===//
8//
Daniel Dunbar5657e7b2010-08-10 23:46:39 +00009// This file implements the Link Time Optimization library. This library is
Nick Kledzik07b4a622008-02-26 20:26:43 +000010// intended to be used by linker to optimize code at link time.
11//
12//===----------------------------------------------------------------------===//
13
Peter Collingbourne5c732202016-07-14 21:21:16 +000014#include "llvm/LTO/legacy/LTOModule.h"
Chandler Carruth4d88a1c2012-12-04 10:44:52 +000015#include "llvm/ADT/Triple.h"
Teresa Johnsonad176792016-11-11 05:34:58 +000016#include "llvm/Bitcode/BitcodeReader.h"
David Blaikieb3bde2e2017-11-17 01:07:10 +000017#include "llvm/CodeGen/TargetSubtargetInfo.h"
Chandler Carruth9fb823b2013-01-02 11:36:10 +000018#include "llvm/IR/Constants.h"
19#include "llvm/IR/LLVMContext.h"
Peter Collingbournec66018e2017-03-31 04:46:50 +000020#include "llvm/IR/Mangler.h"
Yunzhong Gaoa88d7ab2014-01-21 18:31:27 +000021#include "llvm/IR/Metadata.h"
Chandler Carruth9fb823b2013-01-02 11:36:10 +000022#include "llvm/IR/Module.h"
Rafael Espindola1e49a6d2011-03-02 04:14:42 +000023#include "llvm/MC/MCExpr.h"
24#include "llvm/MC/MCInst.h"
Chandler Carruth4d88a1c2012-12-04 10:44:52 +000025#include "llvm/MC/MCParser/MCAsmParser.h"
Rafael Espindola20fcda72014-01-22 22:11:14 +000026#include "llvm/MC/MCSection.h"
Evan Cheng91111d22011-07-09 05:47:46 +000027#include "llvm/MC/MCSubtargetInfo.h"
Rafael Espindola1e49a6d2011-03-02 04:14:42 +000028#include "llvm/MC/MCSymbol.h"
Bill Wendling8f6c8a92012-03-30 23:26:06 +000029#include "llvm/MC/SubtargetFeature.h"
Reid Kleckner89b57062021-10-08 10:48:15 -070030#include "llvm/MC/TargetRegistry.h"
Peter Collingbourne10039c02014-09-18 21:28:49 +000031#include "llvm/Object/IRObjectFile.h"
Francis Visoiu Mistrihe551b732020-02-18 17:13:47 -080032#include "llvm/Object/MachO.h"
Peter Collingbourne10039c02014-09-18 21:28:49 +000033#include "llvm/Object/ObjectFile.h"
Rafael Espindola46ed3532013-06-11 18:05:26 +000034#include "llvm/Support/FileSystem.h"
Chandler Carruth8a8cd2ba2014-01-07 11:48:04 +000035#include "llvm/Support/Host.h"
Bill Wendling8f6c8a92012-03-30 23:26:06 +000036#include "llvm/Support/MemoryBuffer.h"
37#include "llvm/Support/Path.h"
Bill Wendling8f6c8a92012-03-30 23:26:06 +000038#include "llvm/Support/SourceMgr.h"
Bill Wendling8f6c8a92012-03-30 23:26:06 +000039#include "llvm/Support/TargetSelect.h"
David Blaikie6054e652018-03-23 23:58:19 +000040#include "llvm/Target/TargetLoweringObjectFile.h"
Rafael Espindola282a4702013-10-31 20:51:58 +000041#include "llvm/Transforms/Utils/GlobalStatus.h"
Rafael Espindolaa6e9c3e2014-06-12 17:38:55 +000042#include <system_error>
Nick Kledzik07b4a622008-02-26 20:26:43 +000043using namespace llvm;
Peter Collingbourne10039c02014-09-18 21:28:49 +000044using namespace llvm::object;
Nick Kledzik07b4a622008-02-26 20:26:43 +000045
Peter Collingbourne77f4c302016-12-13 20:01:58 +000046LTOModule::LTOModule(std::unique_ptr<Module> M, MemoryBufferRef MBRef,
Rafael Espindoladddd1fd2014-07-04 18:40:36 +000047 llvm::TargetMachine *TM)
Peter Collingbourne77f4c302016-12-13 20:01:58 +000048 : Mod(std::move(M)), MBRef(MBRef), _target(TM) {
Ella Ma1756d672020-11-21 21:04:12 -080049 assert(_target && "target machine is null");
Peter Collingbourne77f4c302016-12-13 20:01:58 +000050 SymTab.addModule(Mod.get());
51}
Bill Wendlingfb440502012-03-28 20:46:54 +000052
Duncan P. N. Exon Smith97b45872014-11-11 23:08:05 +000053LTOModule::~LTOModule() {}
54
Bill Wendlingfb440502012-03-28 20:46:54 +000055/// isBitcodeFile - Returns 'true' if the file (or memory contents) is LLVM
56/// bitcode.
Peter Collingbourne10039c02014-09-18 21:28:49 +000057bool LTOModule::isBitcodeFile(const void *Mem, size_t Length) {
Rafael Espindola3500f5e2017-10-11 18:07:18 +000058 Expected<MemoryBufferRef> BCData = IRObjectFile::findBitcodeInMemBuffer(
Peter Collingbourne10039c02014-09-18 21:28:49 +000059 MemoryBufferRef(StringRef((const char *)Mem, Length), "<mem>"));
Nico Weber1c7c4562018-01-23 19:03:13 +000060 return !errorToBool(BCData.takeError());
Nick Kledzik07b4a622008-02-26 20:26:43 +000061}
62
Mehdi Aminidc5a5072016-10-07 19:05:14 +000063bool LTOModule::isBitcodeFile(StringRef Path) {
Peter Collingbourne10039c02014-09-18 21:28:49 +000064 ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
65 MemoryBuffer::getFile(Path);
66 if (!BufferOrErr)
Rafael Espindola71affba2013-06-12 15:13:57 +000067 return false;
Peter Collingbourne10039c02014-09-18 21:28:49 +000068
Rafael Espindola3500f5e2017-10-11 18:07:18 +000069 Expected<MemoryBufferRef> BCData = IRObjectFile::findBitcodeInMemBuffer(
Peter Collingbourne10039c02014-09-18 21:28:49 +000070 BufferOrErr.get()->getMemBufferRef());
Nico Weber1c7c4562018-01-23 19:03:13 +000071 return !errorToBool(BCData.takeError());
Nick Kledzik07b4a622008-02-26 20:26:43 +000072}
73
Mehdi Amini7c4a1a82016-03-09 01:37:22 +000074bool LTOModule::isThinLTO() {
Peter Collingbournedbd2fed2017-06-15 17:26:13 +000075 Expected<BitcodeLTOInfo> Result = getBitcodeLTOInfo(MBRef);
Peter Collingbournecd513a42016-11-11 19:50:24 +000076 if (!Result) {
Jonas Devlieghere45eb84f2018-11-11 01:46:03 +000077 logAllUnhandledErrors(Result.takeError(), errs());
Peter Collingbournecd513a42016-11-11 19:50:24 +000078 return false;
79 }
Peter Collingbournedbd2fed2017-06-15 17:26:13 +000080 return Result->IsThinLTO;
Mehdi Amini7c4a1a82016-03-09 01:37:22 +000081}
82
Peter Collingbourne10039c02014-09-18 21:28:49 +000083bool LTOModule::isBitcodeForTarget(MemoryBuffer *Buffer,
84 StringRef TriplePrefix) {
Rafael Espindola3500f5e2017-10-11 18:07:18 +000085 Expected<MemoryBufferRef> BCOrErr =
Peter Collingbourne10039c02014-09-18 21:28:49 +000086 IRObjectFile::findBitcodeInMemBuffer(Buffer->getMemBufferRef());
Nico Weber1c7c4562018-01-23 19:03:13 +000087 if (errorToBool(BCOrErr.takeError()))
Peter Collingbourne10039c02014-09-18 21:28:49 +000088 return false;
Duncan P. N. Exon Smith97b45872014-11-11 23:08:05 +000089 LLVMContext Context;
Peter Collingbournecd513a42016-11-11 19:50:24 +000090 ErrorOr<std::string> TripleOrErr =
91 expectedToErrorOrAndEmitErrors(Context, getBitcodeTargetTriple(*BCOrErr));
92 if (!TripleOrErr)
93 return false;
94 return StringRef(*TripleOrErr).startswith(TriplePrefix);
Daniel Dunbar5657e7b2010-08-10 23:46:39 +000095}
96
Mehdi Amini3383ccc2015-11-09 02:46:41 +000097std::string LTOModule::getProducerString(MemoryBuffer *Buffer) {
Rafael Espindola3500f5e2017-10-11 18:07:18 +000098 Expected<MemoryBufferRef> BCOrErr =
Mehdi Amini3383ccc2015-11-09 02:46:41 +000099 IRObjectFile::findBitcodeInMemBuffer(Buffer->getMemBufferRef());
Nico Weber1c7c4562018-01-23 19:03:13 +0000100 if (errorToBool(BCOrErr.takeError()))
Mehdi Amini3383ccc2015-11-09 02:46:41 +0000101 return "";
102 LLVMContext Context;
Peter Collingbournecd513a42016-11-11 19:50:24 +0000103 ErrorOr<std::string> ProducerOrErr = expectedToErrorOrAndEmitErrors(
104 Context, getBitcodeProducerString(*BCOrErr));
105 if (!ProducerOrErr)
106 return "";
107 return *ProducerOrErr;
Mehdi Amini3383ccc2015-11-09 02:46:41 +0000108}
109
Rafael Espindolaa7612b42015-12-04 16:14:31 +0000110ErrorOr<std::unique_ptr<LTOModule>>
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000111LTOModule::createFromFile(LLVMContext &Context, StringRef path,
Benjamin Kramerc321e532016-06-08 19:09:22 +0000112 const TargetOptions &options) {
Rafael Espindolaadf21f22014-07-06 17:43:13 +0000113 ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
114 MemoryBuffer::getFile(path);
Petr Pavlueba30392016-01-20 09:03:42 +0000115 if (std::error_code EC = BufferOrErr.getError()) {
116 Context.emitError(EC.message());
Rafael Espindolaa7612b42015-12-04 16:14:31 +0000117 return EC;
Petr Pavlueba30392016-01-20 09:03:42 +0000118 }
Rafael Espindola48af1c22014-08-19 18:44:46 +0000119 std::unique_ptr<MemoryBuffer> Buffer = std::move(BufferOrErr.get());
Petr Pavlu7ad9ec92016-03-01 13:13:49 +0000120 return makeLTOModule(Buffer->getMemBufferRef(), options, Context,
121 /* ShouldBeLazy*/ false);
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000122}
123
Rafael Espindolaa7612b42015-12-04 16:14:31 +0000124ErrorOr<std::unique_ptr<LTOModule>>
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000125LTOModule::createFromOpenFile(LLVMContext &Context, int fd, StringRef path,
Benjamin Kramerc321e532016-06-08 19:09:22 +0000126 size_t size, const TargetOptions &options) {
Rafael Espindolaa7612b42015-12-04 16:14:31 +0000127 return createFromOpenFileSlice(Context, fd, path, size, 0, options);
Rafael Espindolab39c7c72011-03-17 00:36:11 +0000128}
129
Rafael Espindolaa7612b42015-12-04 16:14:31 +0000130ErrorOr<std::unique_ptr<LTOModule>>
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000131LTOModule::createFromOpenFileSlice(LLVMContext &Context, int fd, StringRef path,
132 size_t map_size, off_t offset,
133 const TargetOptions &options) {
Rafael Espindolaadf21f22014-07-06 17:43:13 +0000134 ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
Reid Klecknercc418a32019-07-10 00:34:13 +0000135 MemoryBuffer::getOpenFileSlice(sys::fs::convertFDToNativeFile(fd), path,
136 map_size, offset);
Petr Pavlueba30392016-01-20 09:03:42 +0000137 if (std::error_code EC = BufferOrErr.getError()) {
138 Context.emitError(EC.message());
Rafael Espindolaa7612b42015-12-04 16:14:31 +0000139 return EC;
Petr Pavlueba30392016-01-20 09:03:42 +0000140 }
Rafael Espindola48af1c22014-08-19 18:44:46 +0000141 std::unique_ptr<MemoryBuffer> Buffer = std::move(BufferOrErr.get());
Petr Pavlu7ad9ec92016-03-01 13:13:49 +0000142 return makeLTOModule(Buffer->getMemBufferRef(), options, Context,
143 /* ShouldBeLazy */ false);
Rafael Espindola56e41f72011-02-08 22:40:47 +0000144}
145
Rafael Espindolaa7612b42015-12-04 16:14:31 +0000146ErrorOr<std::unique_ptr<LTOModule>>
147LTOModule::createFromBuffer(LLVMContext &Context, const void *mem,
Benjamin Kramerc321e532016-06-08 19:09:22 +0000148 size_t length, const TargetOptions &options,
Rafael Espindolaa7612b42015-12-04 16:14:31 +0000149 StringRef path) {
Aaron Ballman47497252014-08-20 12:54:13 +0000150 StringRef Data((const char *)mem, length);
Rafael Espindola48af1c22014-08-19 18:44:46 +0000151 MemoryBufferRef Buffer(Data, path);
Petr Pavlu7ad9ec92016-03-01 13:13:49 +0000152 return makeLTOModule(Buffer, options, Context, /* ShouldBeLazy */ false);
153}
154
155ErrorOr<std::unique_ptr<LTOModule>>
156LTOModule::createInLocalContext(std::unique_ptr<LLVMContext> Context,
157 const void *mem, size_t length,
Benjamin Kramerc321e532016-06-08 19:09:22 +0000158 const TargetOptions &options, StringRef path) {
Petr Pavlu7ad9ec92016-03-01 13:13:49 +0000159 StringRef Data((const char *)mem, length);
160 MemoryBufferRef Buffer(Data, path);
161 // If we own a context, we know this is being used only for symbol extraction,
162 // not linking. Be lazy in that case.
163 ErrorOr<std::unique_ptr<LTOModule>> Ret =
164 makeLTOModule(Buffer, options, *Context, /* ShouldBeLazy */ true);
165 if (Ret)
166 (*Ret)->OwnedContext = std::move(Context);
David Blaikiebcb1c7e2016-03-01 20:41:17 +0000167 return Ret;
Bill Wendlingb8dcda72012-08-06 21:34:54 +0000168}
169
Rafael Espindolaa7612b42015-12-04 16:14:31 +0000170static ErrorOr<std::unique_ptr<Module>>
171parseBitcodeFileImpl(MemoryBufferRef Buffer, LLVMContext &Context,
172 bool ShouldBeLazy) {
Duncan P. N. Exon Smith140d41b2014-12-17 22:05:42 +0000173 // Find the buffer.
Rafael Espindola3500f5e2017-10-11 18:07:18 +0000174 Expected<MemoryBufferRef> MBOrErr =
Duncan P. N. Exon Smith140d41b2014-12-17 22:05:42 +0000175 IRObjectFile::findBitcodeInMemBuffer(Buffer);
Rafael Espindola3500f5e2017-10-11 18:07:18 +0000176 if (Error E = MBOrErr.takeError()) {
177 std::error_code EC = errorToErrorCode(std::move(E));
Petr Pavlueba30392016-01-20 09:03:42 +0000178 Context.emitError(EC.message());
Rafael Espindolaa7612b42015-12-04 16:14:31 +0000179 return EC;
Petr Pavlueba30392016-01-20 09:03:42 +0000180 }
Rafael Espindolad0b23be2015-01-10 00:07:30 +0000181
182 if (!ShouldBeLazy) {
Duncan P. N. Exon Smith140d41b2014-12-17 22:05:42 +0000183 // Parse the full file.
Peter Collingbourned9445c42016-11-13 07:00:17 +0000184 return expectedToErrorOrAndEmitErrors(Context,
185 parseBitcodeFile(*MBOrErr, Context));
Rafael Espindolad0b23be2015-01-10 00:07:30 +0000186 }
Duncan P. N. Exon Smith140d41b2014-12-17 22:05:42 +0000187
188 // Parse lazily.
Peter Collingbourned9445c42016-11-13 07:00:17 +0000189 return expectedToErrorOrAndEmitErrors(
190 Context,
191 getLazyBitcodeModule(*MBOrErr, Context, true /*ShouldLazyLoadMetadata*/));
Duncan P. N. Exon Smith140d41b2014-12-17 22:05:42 +0000192}
193
Rafael Espindolaa7612b42015-12-04 16:14:31 +0000194ErrorOr<std::unique_ptr<LTOModule>>
Benjamin Kramerc321e532016-06-08 19:09:22 +0000195LTOModule::makeLTOModule(MemoryBufferRef Buffer, const TargetOptions &options,
Petr Pavlu7ad9ec92016-03-01 13:13:49 +0000196 LLVMContext &Context, bool ShouldBeLazy) {
Rafael Espindolaa7612b42015-12-04 16:14:31 +0000197 ErrorOr<std::unique_ptr<Module>> MOrErr =
Petr Pavlu7ad9ec92016-03-01 13:13:49 +0000198 parseBitcodeFileImpl(Buffer, Context, ShouldBeLazy);
Rafael Espindolaa7612b42015-12-04 16:14:31 +0000199 if (std::error_code EC = MOrErr.getError())
200 return EC;
201 std::unique_ptr<Module> &M = *MOrErr;
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000202
Rafael Espindoladddd1fd2014-07-04 18:40:36 +0000203 std::string TripleStr = M->getTargetTriple();
Bob Wilson3f7e7c02012-10-12 17:39:25 +0000204 if (TripleStr.empty())
205 TripleStr = sys::getDefaultTargetTriple();
206 llvm::Triple Triple(TripleStr);
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000207
208 // find machine architecture for this module
Rafael Espindolaa7612b42015-12-04 16:14:31 +0000209 std::string errMsg;
Bob Wilson3f7e7c02012-10-12 17:39:25 +0000210 const Target *march = TargetRegistry::lookupTarget(TripleStr, errMsg);
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000211 if (!march)
Adam Nemetade40dd2018-03-13 04:37:01 +0000212 return make_error_code(object::object_error::arch_not_found);
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000213
Nick Lewycky364c04a2011-04-21 01:54:08 +0000214 // construct LTOModule, hand over ownership of module and target
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000215 SubtargetFeatures Features;
Bob Wilson3f7e7c02012-10-12 17:39:25 +0000216 Features.getDefaultSubtargetFeatures(Triple);
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000217 std::string FeatureStr = Features.getString();
Bob Wilson3f7e7c02012-10-12 17:39:25 +0000218 // Set a default CPU for Darwin triples.
Evan Chengfe6e4052011-06-30 01:53:36 +0000219 std::string CPU;
Bob Wilson3f7e7c02012-10-12 17:39:25 +0000220 if (Triple.isOSDarwin()) {
221 if (Triple.getArch() == llvm::Triple::x86_64)
222 CPU = "core2";
223 else if (Triple.getArch() == llvm::Triple::x86)
224 CPU = "yonah";
Ahmed Bougachaf77c9482020-09-03 08:43:21 -0700225 else if (Triple.isArm64e())
226 CPU = "apple-a12";
Tim Northoverf1c28922019-09-12 10:22:23 +0000227 else if (Triple.getArch() == llvm::Triple::aarch64 ||
228 Triple.getArch() == llvm::Triple::aarch64_32)
Tim Northover00ed9962014-03-29 10:18:08 +0000229 CPU = "cyclone";
Bob Wilson3f7e7c02012-10-12 17:39:25 +0000230 }
Rafael Espindola0b385c72013-09-30 16:39:19 +0000231
Rafael Espindola8c34dd82016-05-18 22:04:49 +0000232 TargetMachine *target =
233 march->createTargetMachine(TripleStr, CPU, FeatureStr, options, None);
Rafael Espindola282a4702013-10-31 20:51:58 +0000234
Peter Collingbourne77f4c302016-12-13 20:01:58 +0000235 std::unique_ptr<LTOModule> Ret(new LTOModule(std::move(M), Buffer, target));
Rafael Espindolaa06bb162015-12-03 23:56:42 +0000236 Ret->parseSymbols();
Yunzhong Gaoa88d7ab2014-01-21 18:31:27 +0000237 Ret->parseMetadata();
238
Bill Wendlingc55cf4a2020-02-10 07:06:45 -0800239 return std::move(Ret);
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000240}
241
Manman Ren03456a12014-02-10 23:26:14 +0000242/// Create a MemoryBuffer from a memory range with an optional name.
Rafael Espindolaa6d0b2f2014-08-17 22:37:39 +0000243std::unique_ptr<MemoryBuffer>
244LTOModule::makeBuffer(const void *mem, size_t length, StringRef name) {
Roman Divackyad06cee2012-09-05 22:26:57 +0000245 const char *startPtr = (const char*)mem;
Rafael Espindola3560ff22014-08-27 20:03:13 +0000246 return MemoryBuffer::getMemBuffer(StringRef(startPtr, length), name, false);
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000247}
248
Bill Wendlingfb440502012-03-28 20:46:54 +0000249/// objcClassNameFromExpression - Get string that the data pointer points to.
Rafael Espindola6ee19d22012-12-11 03:10:43 +0000250bool
251LTOModule::objcClassNameFromExpression(const Constant *c, std::string &name) {
252 if (const ConstantExpr *ce = dyn_cast<ConstantExpr>(c)) {
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000253 Constant *op = ce->getOperand(0);
254 if (GlobalVariable *gvn = dyn_cast<GlobalVariable>(op)) {
255 Constant *cn = gvn->getInitializer();
Chris Lattnercf9e8f62012-02-05 02:29:43 +0000256 if (ConstantDataArray *ca = dyn_cast<ConstantDataArray>(cn)) {
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000257 if (ca->isCString()) {
Yaron Keren075759a2015-03-30 15:42:36 +0000258 name = (".objc_class_name_" + ca->getAsCString()).str();
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000259 return true;
Nick Kledzikb481c202009-06-01 20:33:09 +0000260 }
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000261 }
Nick Kledzikb481c202009-06-01 20:33:09 +0000262 }
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000263 }
264 return false;
265}
266
Bill Wendlingfb440502012-03-28 20:46:54 +0000267/// addObjCClass - Parse i386/ppc ObjC class data structure.
Rafael Espindola6ee19d22012-12-11 03:10:43 +0000268void LTOModule::addObjCClass(const GlobalVariable *clgv) {
269 const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
Bill Wendling5f689e72011-11-04 18:48:00 +0000270 if (!c) return;
Nick Kledzikb481c202009-06-01 20:33:09 +0000271
Bill Wendling5f689e72011-11-04 18:48:00 +0000272 // second slot in __OBJC,__class is pointer to superclass name
273 std::string superclassName;
274 if (objcClassNameFromExpression(c->getOperand(1), superclassName)) {
David Blaikie5106ce72014-11-19 05:49:42 +0000275 auto IterBool =
276 _undefines.insert(std::make_pair(superclassName, NameAndAttributes()));
277 if (IterBool.second) {
278 NameAndAttributes &info = IterBool.first->second;
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000279 info.name = IterBool.first->first();
Rafael Espindola477d11f2011-02-20 16:27:25 +0000280 info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
Bill Wendling9ee2d332012-03-29 08:27:32 +0000281 info.isFunction = false;
282 info.symbol = clgv;
Nick Kledzikb481c202009-06-01 20:33:09 +0000283 }
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000284 }
Bill Wendling5f689e72011-11-04 18:48:00 +0000285
286 // third slot in __OBJC,__class is pointer to class name
287 std::string className;
288 if (objcClassNameFromExpression(c->getOperand(2), className)) {
David Blaikie5106ce72014-11-19 05:49:42 +0000289 auto Iter = _defines.insert(className).first;
Bill Wendling9ee2d332012-03-29 08:27:32 +0000290
Bill Wendling5f689e72011-11-04 18:48:00 +0000291 NameAndAttributes info;
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000292 info.name = Iter->first();
Bill Wendling9ee2d332012-03-29 08:27:32 +0000293 info.attributes = LTO_SYMBOL_PERMISSIONS_DATA |
294 LTO_SYMBOL_DEFINITION_REGULAR | LTO_SYMBOL_SCOPE_DEFAULT;
295 info.isFunction = false;
296 info.symbol = clgv;
Bill Wendling5f689e72011-11-04 18:48:00 +0000297 _symbols.push_back(info);
298 }
299}
300
Bill Wendlingfb440502012-03-28 20:46:54 +0000301/// addObjCCategory - Parse i386/ppc ObjC category data structure.
Rafael Espindola6ee19d22012-12-11 03:10:43 +0000302void LTOModule::addObjCCategory(const GlobalVariable *clgv) {
303 const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
Bill Wendling5f689e72011-11-04 18:48:00 +0000304 if (!c) return;
305
306 // second slot in __OBJC,__category is pointer to target class name
307 std::string targetclassName;
308 if (!objcClassNameFromExpression(c->getOperand(1), targetclassName))
309 return;
310
David Blaikie5106ce72014-11-19 05:49:42 +0000311 auto IterBool =
312 _undefines.insert(std::make_pair(targetclassName, NameAndAttributes()));
Bill Wendling5f689e72011-11-04 18:48:00 +0000313
David Blaikie5106ce72014-11-19 05:49:42 +0000314 if (!IterBool.second)
Bill Wendling5f689e72011-11-04 18:48:00 +0000315 return;
316
David Blaikie5106ce72014-11-19 05:49:42 +0000317 NameAndAttributes &info = IterBool.first->second;
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000318 info.name = IterBool.first->first();
Bill Wendling5f689e72011-11-04 18:48:00 +0000319 info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
Bill Wendling9ee2d332012-03-29 08:27:32 +0000320 info.isFunction = false;
321 info.symbol = clgv;
Nick Kledzikb481c202009-06-01 20:33:09 +0000322}
323
Bill Wendlingfb440502012-03-28 20:46:54 +0000324/// addObjCClassRef - Parse i386/ppc ObjC class list data structure.
Rafael Espindola6ee19d22012-12-11 03:10:43 +0000325void LTOModule::addObjCClassRef(const GlobalVariable *clgv) {
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000326 std::string targetclassName;
Bill Wendling5f689e72011-11-04 18:48:00 +0000327 if (!objcClassNameFromExpression(clgv->getInitializer(), targetclassName))
328 return;
Rafael Espindola477d11f2011-02-20 16:27:25 +0000329
David Blaikie5106ce72014-11-19 05:49:42 +0000330 auto IterBool =
331 _undefines.insert(std::make_pair(targetclassName, NameAndAttributes()));
332
333 if (!IterBool.second)
Bill Wendling5f689e72011-11-04 18:48:00 +0000334 return;
Rafael Espindola477d11f2011-02-20 16:27:25 +0000335
David Blaikie5106ce72014-11-19 05:49:42 +0000336 NameAndAttributes &info = IterBool.first->second;
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000337 info.name = IterBool.first->first();
Bill Wendling5f689e72011-11-04 18:48:00 +0000338 info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
Bill Wendling9ee2d332012-03-29 08:27:32 +0000339 info.isFunction = false;
340 info.symbol = clgv;
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000341}
342
Peter Collingbourne77f4c302016-12-13 20:01:58 +0000343void LTOModule::addDefinedDataSymbol(ModuleSymbolTable::Symbol Sym) {
Rafael Espindola0972d412014-07-04 16:37:02 +0000344 SmallString<64> Buffer;
Rafael Espindoladddd1fd2014-07-04 18:40:36 +0000345 {
346 raw_svector_ostream OS(Buffer);
Peter Collingbourne77f4c302016-12-13 20:01:58 +0000347 SymTab.printSymbolName(OS, Sym);
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000348 Buffer.c_str();
Rafael Espindoladddd1fd2014-07-04 18:40:36 +0000349 }
350
Peter Collingbourne77f4c302016-12-13 20:01:58 +0000351 const GlobalValue *V = Sym.get<GlobalValue *>();
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000352 addDefinedDataSymbol(Buffer, V);
Rafael Espindola0972d412014-07-04 16:37:02 +0000353}
354
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000355void LTOModule::addDefinedDataSymbol(StringRef Name, const GlobalValue *v) {
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000356 // Add to list of defined symbols.
Rafael Espindola0972d412014-07-04 16:37:02 +0000357 addDefinedSymbol(Name, v, false);
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000358
Bill Wendling45f74e32012-08-06 22:52:45 +0000359 if (!v->hasSection() /* || !isTargetDarwin */)
360 return;
361
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000362 // Special case i386/ppc ObjC data structures in magic sections:
363 // The issue is that the old ObjC object format did some strange
364 // contortions to avoid real linker symbols. For instance, the
365 // ObjC class data structure is allocated statically in the executable
366 // that defines that class. That data structures contains a pointer to
367 // its superclass. But instead of just initializing that part of the
368 // struct to the address of its superclass, and letting the static and
369 // dynamic linkers do the rest, the runtime works by having that field
370 // instead point to a C-string that is the name of the superclass.
371 // At runtime the objc initialization updates that pointer and sets
372 // it to point to the actual super class. As far as the linker
373 // knows it is just a pointer to a string. But then someone wanted the
374 // linker to issue errors at build time if the superclass was not found.
375 // So they figured out a way in mach-o object format to use an absolute
376 // symbols (.objc_class_name_Foo = 0) and a floating reference
377 // (.reference .objc_class_name_Bar) to cause the linker into erroring when
378 // a class was missing.
379 // The following synthesizes the implicit .objc_* symbols for the linker
380 // from the ObjC data structures generated by the front end.
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000381
Bill Wendling45f74e32012-08-06 22:52:45 +0000382 // special case if this data blob is an ObjC class definition
Benjamin Kramer3afb1732017-12-28 18:31:19 +0000383 if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(v)) {
384 StringRef Section = GV->getSection();
385 if (Section.startswith("__OBJC,__class,")) {
386 addObjCClass(GV);
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000387 }
388
Benjamin Kramer3afb1732017-12-28 18:31:19 +0000389 // special case if this data blob is an ObjC category definition
390 else if (Section.startswith("__OBJC,__category,")) {
391 addObjCCategory(GV);
Bill Wendling45f74e32012-08-06 22:52:45 +0000392 }
Bill Wendling45f74e32012-08-06 22:52:45 +0000393
Benjamin Kramer3afb1732017-12-28 18:31:19 +0000394 // special case if this data blob is the list of referenced classes
395 else if (Section.startswith("__OBJC,__cls_refs,")) {
396 addObjCClassRef(GV);
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000397 }
398 }
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000399}
400
Peter Collingbourne77f4c302016-12-13 20:01:58 +0000401void LTOModule::addDefinedFunctionSymbol(ModuleSymbolTable::Symbol Sym) {
Rafael Espindola0972d412014-07-04 16:37:02 +0000402 SmallString<64> Buffer;
Rafael Espindoladddd1fd2014-07-04 18:40:36 +0000403 {
404 raw_svector_ostream OS(Buffer);
Peter Collingbourne77f4c302016-12-13 20:01:58 +0000405 SymTab.printSymbolName(OS, Sym);
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000406 Buffer.c_str();
Rafael Espindoladddd1fd2014-07-04 18:40:36 +0000407 }
408
Peter Collingbourne77f4c302016-12-13 20:01:58 +0000409 const Function *F = cast<Function>(Sym.get<GlobalValue *>());
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000410 addDefinedFunctionSymbol(Buffer, F);
Rafael Espindola0972d412014-07-04 16:37:02 +0000411}
412
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000413void LTOModule::addDefinedFunctionSymbol(StringRef Name, const Function *F) {
Bill Wendlingfb440502012-03-28 20:46:54 +0000414 // add to list of defined symbols
Rafael Espindola0972d412014-07-04 16:37:02 +0000415 addDefinedSymbol(Name, F, true);
Bill Wendlingfb440502012-03-28 20:46:54 +0000416}
417
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000418void LTOModule::addDefinedSymbol(StringRef Name, const GlobalValue *def,
Rafael Espindola0972d412014-07-04 16:37:02 +0000419 bool isFunction) {
Eli Friedmana2caa3b2020-05-18 20:38:13 -0700420 const GlobalObject *go = dyn_cast<GlobalObject>(def);
421 uint32_t attr = go ? Log2(go->getAlign().valueOrOne()) : 0;
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000422
423 // set permissions part
Bill Wendling9ee2d332012-03-29 08:27:32 +0000424 if (isFunction) {
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000425 attr |= LTO_SYMBOL_PERMISSIONS_CODE;
Bill Wendling9ee2d332012-03-29 08:27:32 +0000426 } else {
Rafael Espindola6ee19d22012-12-11 03:10:43 +0000427 const GlobalVariable *gv = dyn_cast<GlobalVariable>(def);
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000428 if (gv && gv->isConstant())
429 attr |= LTO_SYMBOL_PERMISSIONS_RODATA;
430 else
431 attr |= LTO_SYMBOL_PERMISSIONS_DATA;
432 }
433
434 // set definition part
Rafael Espindola2fb5bc32014-03-13 23:18:37 +0000435 if (def->hasWeakLinkage() || def->hasLinkOnceLinkage())
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000436 attr |= LTO_SYMBOL_DEFINITION_WEAK;
Bill Wendlingdcd7c2b2010-09-27 20:17:45 +0000437 else if (def->hasCommonLinkage())
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000438 attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
Bill Wendlingdcd7c2b2010-09-27 20:17:45 +0000439 else
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000440 attr |= LTO_SYMBOL_DEFINITION_REGULAR;
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000441
442 // set scope part
Duncan P. N. Exon Smith87121f82014-05-07 22:53:14 +0000443 if (def->hasLocalLinkage())
444 // Ignore visibility if linkage is local.
445 attr |= LTO_SYMBOL_SCOPE_INTERNAL;
446 else if (def->hasHiddenVisibility())
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000447 attr |= LTO_SYMBOL_SCOPE_HIDDEN;
448 else if (def->hasProtectedVisibility())
449 attr |= LTO_SYMBOL_SCOPE_PROTECTED;
David Blaikie88209292018-03-21 19:23:45 +0000450 else if (def->canBeOmittedFromSymbolTable())
Rafael Espindola282a4702013-10-31 20:51:58 +0000451 attr |= LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN;
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000452 else
Duncan P. N. Exon Smith87121f82014-05-07 22:53:14 +0000453 attr |= LTO_SYMBOL_SCOPE_DEFAULT;
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000454
Peter Collingbourne485ad482015-06-11 21:41:27 +0000455 if (def->hasComdat())
456 attr |= LTO_SYMBOL_COMDAT;
457
Peter Collingbourne17eff102015-07-04 03:42:35 +0000458 if (isa<GlobalAlias>(def))
459 attr |= LTO_SYMBOL_ALIAS;
460
David Blaikie5106ce72014-11-19 05:49:42 +0000461 auto Iter = _defines.insert(Name).first;
Rafael Espindola477d11f2011-02-20 16:27:25 +0000462
Bill Wendling9ee2d332012-03-29 08:27:32 +0000463 // fill information structure
464 NameAndAttributes info;
David Blaikie5106ce72014-11-19 05:49:42 +0000465 StringRef NameRef = Iter->first();
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000466 info.name = NameRef;
467 assert(NameRef.data()[NameRef.size()] == '\0');
Bill Wendling9ee2d332012-03-29 08:27:32 +0000468 info.attributes = attr;
469 info.isFunction = isFunction;
470 info.symbol = def;
471
472 // add to table of symbols
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000473 _symbols.push_back(info);
Nick Kledzik07b4a622008-02-26 20:26:43 +0000474}
475
Bill Wendlingfb440502012-03-28 20:46:54 +0000476/// addAsmGlobalSymbol - Add a global symbol from module-level ASM to the
477/// defined list.
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000478void LTOModule::addAsmGlobalSymbol(StringRef name,
Rafael Espindola1e49a6d2011-03-02 04:14:42 +0000479 lto_symbol_attributes scope) {
David Blaikie5106ce72014-11-19 05:49:42 +0000480 auto IterBool = _defines.insert(name);
Rafael Espindola477d11f2011-02-20 16:27:25 +0000481
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000482 // only add new define if not already defined
David Blaikie5106ce72014-11-19 05:49:42 +0000483 if (!IterBool.second)
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000484 return;
485
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000486 NameAndAttributes &info = _undefines[IterBool.first->first()];
Bill Wendling9ee2d332012-03-29 08:27:32 +0000487
Craig Topper2617dcc2014-04-15 06:32:26 +0000488 if (info.symbol == nullptr) {
Bill Wendling71b19bb2012-04-02 10:01:21 +0000489 // FIXME: This is trying to take care of module ASM like this:
490 //
491 // module asm ".zerofill __FOO, __foo, _bar_baz_qux, 0"
492 //
493 // but is gross and its mother dresses it funny. Have the ASM parser give us
494 // more details for this type of situation so that we're not guessing so
495 // much.
496
497 // fill information structure
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000498 info.name = IterBool.first->first();
Bill Wendling71b19bb2012-04-02 10:01:21 +0000499 info.attributes =
500 LTO_SYMBOL_PERMISSIONS_DATA | LTO_SYMBOL_DEFINITION_REGULAR | scope;
501 info.isFunction = false;
Craig Topper2617dcc2014-04-15 06:32:26 +0000502 info.symbol = nullptr;
Bill Wendling71b19bb2012-04-02 10:01:21 +0000503
504 // add to table of symbols
505 _symbols.push_back(info);
Bill Wendling3a0bcf02012-04-02 03:33:31 +0000506 return;
507 }
508
Bill Wendling9ee2d332012-03-29 08:27:32 +0000509 if (info.isFunction)
Rafael Espindola0972d412014-07-04 16:37:02 +0000510 addDefinedFunctionSymbol(info.name, cast<Function>(info.symbol));
Bill Wendling9ee2d332012-03-29 08:27:32 +0000511 else
Rafael Espindola0972d412014-07-04 16:37:02 +0000512 addDefinedDataSymbol(info.name, info.symbol);
Bill Wendling8f6c8a92012-03-30 23:26:06 +0000513
514 _symbols.back().attributes &= ~LTO_SYMBOL_SCOPE_MASK;
515 _symbols.back().attributes |= scope;
Devang Patela59fe952008-07-16 18:06:52 +0000516}
Nick Kledzik07b4a622008-02-26 20:26:43 +0000517
Bill Wendlingfb440502012-03-28 20:46:54 +0000518/// addAsmGlobalSymbolUndef - Add a global symbol from module-level ASM to the
519/// undefined list.
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000520void LTOModule::addAsmGlobalSymbolUndef(StringRef name) {
David Blaikie5106ce72014-11-19 05:49:42 +0000521 auto IterBool = _undefines.insert(std::make_pair(name, NameAndAttributes()));
Rafael Espindola1e49a6d2011-03-02 04:14:42 +0000522
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000523 _asm_undefines.push_back(IterBool.first->first());
Rafael Espindola1e49a6d2011-03-02 04:14:42 +0000524
525 // we already have the symbol
David Blaikie5106ce72014-11-19 05:49:42 +0000526 if (!IterBool.second)
Rafael Espindola1e49a6d2011-03-02 04:14:42 +0000527 return;
528
Alp Toker98444342014-04-19 23:56:35 +0000529 uint32_t attr = LTO_SYMBOL_DEFINITION_UNDEFINED;
Rafael Espindola1e49a6d2011-03-02 04:14:42 +0000530 attr |= LTO_SYMBOL_SCOPE_DEFAULT;
David Blaikie5106ce72014-11-19 05:49:42 +0000531 NameAndAttributes &info = IterBool.first->second;
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000532 info.name = IterBool.first->first();
Bill Wendling9ee2d332012-03-29 08:27:32 +0000533 info.attributes = attr;
534 info.isFunction = false;
Craig Topper2617dcc2014-04-15 06:32:26 +0000535 info.symbol = nullptr;
Rafael Espindola1e49a6d2011-03-02 04:14:42 +0000536}
537
Rafael Espindoladddd1fd2014-07-04 18:40:36 +0000538/// Add a symbol which isn't defined just yet to a list to be resolved later.
Peter Collingbourne77f4c302016-12-13 20:01:58 +0000539void LTOModule::addPotentialUndefinedSymbol(ModuleSymbolTable::Symbol Sym,
Rafael Espindoladddd1fd2014-07-04 18:40:36 +0000540 bool isFunc) {
Rafael Espindola34b59382011-02-11 05:23:09 +0000541 SmallString<64> name;
Rafael Espindoladddd1fd2014-07-04 18:40:36 +0000542 {
543 raw_svector_ostream OS(name);
Peter Collingbourne77f4c302016-12-13 20:01:58 +0000544 SymTab.printSymbolName(OS, Sym);
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000545 name.c_str();
Rafael Espindoladddd1fd2014-07-04 18:40:36 +0000546 }
Rafael Espindola56548522009-04-24 16:55:21 +0000547
David Blaikie1def2572021-07-08 13:30:14 -0700548 auto IterBool =
549 _undefines.insert(std::make_pair(name.str(), NameAndAttributes()));
Rafael Espindola477d11f2011-02-20 16:27:25 +0000550
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000551 // we already have the symbol
David Blaikie5106ce72014-11-19 05:49:42 +0000552 if (!IterBool.second)
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000553 return;
Rafael Espindola56548522009-04-24 16:55:21 +0000554
David Blaikie5106ce72014-11-19 05:49:42 +0000555 NameAndAttributes &info = IterBool.first->second;
Rafael Espindola477d11f2011-02-20 16:27:25 +0000556
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000557 info.name = IterBool.first->first();
Bill Wendlingfb440502012-03-28 20:46:54 +0000558
Peter Collingbourne77f4c302016-12-13 20:01:58 +0000559 const GlobalValue *decl = Sym.dyn_cast<GlobalValue *>();
Rafael Espindoladddd1fd2014-07-04 18:40:36 +0000560
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000561 if (decl->hasExternalWeakLinkage())
562 info.attributes = LTO_SYMBOL_DEFINITION_WEAKUNDEF;
563 else
564 info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
Rafael Espindola477d11f2011-02-20 16:27:25 +0000565
Bill Wendling9ee2d332012-03-29 08:27:32 +0000566 info.isFunction = isFunc;
567 info.symbol = decl;
Nick Kledzik07b4a622008-02-26 20:26:43 +0000568}
569
Rafael Espindolaa06bb162015-12-03 23:56:42 +0000570void LTOModule::parseSymbols() {
Peter Collingbourne77f4c302016-12-13 20:01:58 +0000571 for (auto Sym : SymTab.symbols()) {
572 auto *GV = Sym.dyn_cast<GlobalValue *>();
573 uint32_t Flags = SymTab.getSymbolFlags(Sym);
Rafael Espindola089a3172014-07-04 19:31:27 +0000574 if (Flags & object::BasicSymbolRef::SF_FormatSpecific)
575 continue;
576
Rafael Espindoladddd1fd2014-07-04 18:40:36 +0000577 bool IsUndefined = Flags & object::BasicSymbolRef::SF_Undefined;
578
579 if (!GV) {
580 SmallString<64> Buffer;
581 {
582 raw_svector_ostream OS(Buffer);
Peter Collingbourne77f4c302016-12-13 20:01:58 +0000583 SymTab.printSymbolName(OS, Sym);
Mehdi Aminidc5a5072016-10-07 19:05:14 +0000584 Buffer.c_str();
Rafael Espindoladddd1fd2014-07-04 18:40:36 +0000585 }
David Blaikie1def2572021-07-08 13:30:14 -0700586 StringRef Name = Buffer;
Rafael Espindoladddd1fd2014-07-04 18:40:36 +0000587
588 if (IsUndefined)
589 addAsmGlobalSymbolUndef(Name);
590 else if (Flags & object::BasicSymbolRef::SF_Global)
591 addAsmGlobalSymbol(Name, LTO_SYMBOL_SCOPE_DEFAULT);
592 else
593 addAsmGlobalSymbol(Name, LTO_SYMBOL_SCOPE_INTERNAL);
594 continue;
595 }
596
597 auto *F = dyn_cast<Function>(GV);
598 if (IsUndefined) {
599 addPotentialUndefinedSymbol(Sym, F != nullptr);
600 continue;
601 }
602
603 if (F) {
604 addDefinedFunctionSymbol(Sym);
605 continue;
606 }
607
608 if (isa<GlobalVariable>(GV)) {
609 addDefinedDataSymbol(Sym);
610 continue;
611 }
612
613 assert(isa<GlobalAlias>(GV));
614 addDefinedDataSymbol(Sym);
Daniel Dunbar919660b2010-08-10 23:46:46 +0000615 }
Nick Kledzik07b4a622008-02-26 20:26:43 +0000616
Daniel Dunbar919660b2010-08-10 23:46:46 +0000617 // make symbols for all undefines
Bill Wendling9ee2d332012-03-29 08:27:32 +0000618 for (StringMap<NameAndAttributes>::iterator u =_undefines.begin(),
619 e = _undefines.end(); u != e; ++u) {
620 // If this symbol also has a definition, then don't make an undefine because
621 // it is a tentative definition.
622 if (_defines.count(u->getKey())) continue;
623 NameAndAttributes info = u->getValue();
624 _symbols.push_back(info);
Daniel Dunbar5657e7b2010-08-10 23:46:39 +0000625 }
Nick Kledzik91a6dcf2008-02-27 22:25:36 +0000626}
Yunzhong Gaoa88d7ab2014-01-21 18:31:27 +0000627
628/// parseMetadata - Parse metadata from the module
629void LTOModule::parseMetadata() {
Peter Collingbourneaef36592015-06-29 22:04:09 +0000630 raw_string_ostream OS(LinkerOpts);
631
Yunzhong Gaoa88d7ab2014-01-21 18:31:27 +0000632 // Linker Options
Peter Collingbourne89061b22017-06-12 20:10:48 +0000633 if (NamedMDNode *LinkerOptions =
634 getModule().getNamedMetadata("llvm.linker.options")) {
Yunzhong Gaoa88d7ab2014-01-21 18:31:27 +0000635 for (unsigned i = 0, e = LinkerOptions->getNumOperands(); i != e; ++i) {
Peter Collingbourne89061b22017-06-12 20:10:48 +0000636 MDNode *MDOptions = LinkerOptions->getOperand(i);
Yunzhong Gaoa88d7ab2014-01-21 18:31:27 +0000637 for (unsigned ii = 0, ie = MDOptions->getNumOperands(); ii != ie; ++ii) {
638 MDString *MDOption = cast<MDString>(MDOptions->getOperand(ii));
Peter Collingbourneaef36592015-06-29 22:04:09 +0000639 OS << " " << MDOption->getString();
Yunzhong Gaoa88d7ab2014-01-21 18:31:27 +0000640 }
641 }
642 }
643
Bob Haarmane2fe59f2017-02-04 01:28:44 +0000644 // Globals - we only need to do this for COFF.
645 const Triple TT(_target->getTargetTriple());
646 if (!TT.isOSBinFormatCOFF())
647 return;
648 Mangler M;
Peter Collingbourneaef36592015-06-29 22:04:09 +0000649 for (const NameAndAttributes &Sym : _symbols) {
650 if (!Sym.symbol)
651 continue;
Bob Haarmane2fe59f2017-02-04 01:28:44 +0000652 emitLinkerFlagsForGlobalCOFF(OS, Sym.symbol, TT, M);
Peter Collingbourneaef36592015-06-29 22:04:09 +0000653 }
Ben Dunbobbin564d2482019-06-12 11:07:56 +0000654}
Peter Collingbourneaef36592015-06-29 22:04:09 +0000655
Ben Dunbobbin564d2482019-06-12 11:07:56 +0000656lto::InputFile *LTOModule::createInputFile(const void *buffer,
657 size_t buffer_size, const char *path,
658 std::string &outErr) {
659 StringRef Data((const char *)buffer, buffer_size);
660 MemoryBufferRef BufferRef(Data, path);
661
662 Expected<std::unique_ptr<lto::InputFile>> ObjOrErr =
663 lto::InputFile::create(BufferRef);
664
665 if (ObjOrErr)
666 return ObjOrErr->release();
667
668 outErr = std::string(path) +
669 ": Could not read LTO input file: " + toString(ObjOrErr.takeError());
670 return nullptr;
671}
672
673size_t LTOModule::getDependentLibraryCount(lto::InputFile *input) {
674 return input->getDependentLibraries().size();
675}
676
677const char *LTOModule::getDependentLibrary(lto::InputFile *input, size_t index,
678 size_t *size) {
679 StringRef S = input->getDependentLibraries()[index];
680 *size = S.size();
681 return S.data();
Yunzhong Gaoa88d7ab2014-01-21 18:31:27 +0000682}
Francis Visoiu Mistrihe551b732020-02-18 17:13:47 -0800683
684Expected<uint32_t> LTOModule::getMachOCPUType() const {
685 return MachO::getCPUType(Triple(Mod->getTargetTriple()));
686}
687
688Expected<uint32_t> LTOModule::getMachOCPUSubType() const {
689 return MachO::getCPUSubType(Triple(Mod->getTargetTriple()));
690}
Wael Yehia9559bd12021-07-27 09:26:38 -0400691
692bool LTOModule::hasCtorDtor() const {
693 for (auto Sym : SymTab.symbols()) {
694 if (auto *GV = Sym.dyn_cast<GlobalValue *>()) {
695 StringRef Name = GV->getName();
696 if (Name.consume_front("llvm.global_")) {
697 if (Name.equals("ctors") || Name.equals("dtors"))
698 return true;
699 }
700 }
701 }
702 return false;
703}