1 //===- EmbedBitcodePass.cpp - Pass that embeds the bitcode into a global---===// 2 // 3 // 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 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "llvm/Transforms/IPO/EmbedBitcodePass.h" 10 #include "llvm/Bitcode/BitcodeWriter.h" 11 #include "llvm/Bitcode/BitcodeWriterPass.h" 12 #include "llvm/IR/Constants.h" 13 #include "llvm/IR/PassManager.h" 14 #include "llvm/InitializePasses.h" 15 #include "llvm/Pass.h" 16 #include "llvm/Passes/PassBuilder.h" 17 #include "llvm/Support/ErrorHandling.h" 18 #include "llvm/Support/MemoryBuffer.h" 19 #include "llvm/TargetParser/Triple.h" 20 #include "llvm/Transforms/IPO/ThinLTOBitcodeWriter.h" 21 #include "llvm/Transforms/Utils/Cloning.h" 22 #include "llvm/Transforms/Utils/ModuleUtils.h" 23 24 using namespace llvm; 25 26 PreservedAnalyses EmbedBitcodePass::run(Module &M, ModuleAnalysisManager &AM) { 27 if (M.getGlobalVariable("llvm.embedded.module", /*AllowInternal=*/true)) 28 report_fatal_error("Can only embed the module once", 29 /*gen_crash_diag=*/false); 30 31 Triple T(M.getTargetTriple()); 32 if (T.getObjectFormat() != Triple::ELF) 33 report_fatal_error( 34 "EmbedBitcode pass currently only supports ELF object format", 35 /*gen_crash_diag=*/false); 36 37 std::unique_ptr<Module> NewModule = CloneModule(M); 38 MPM.run(*NewModule, AM); 39 40 std::string Data; 41 raw_string_ostream OS(Data); 42 if (IsThinLTO) 43 ThinLTOBitcodeWriterPass(OS, /*ThinLinkOS=*/nullptr).run(*NewModule, AM); 44 else 45 BitcodeWriterPass(OS, /*ShouldPreserveUseListOrder=*/false, EmitLTOSummary) 46 .run(*NewModule, AM); 47 48 embedBufferInModule(M, MemoryBufferRef(Data, "ModuleData"), ".llvm.lto"); 49 50 return PreservedAnalyses::all(); 51 } 52