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/PassManager.h"
13 #include "llvm/Pass.h"
14 #include "llvm/Support/ErrorHandling.h"
15 #include "llvm/Support/MemoryBufferRef.h"
16 #include "llvm/Support/raw_ostream.h"
17 #include "llvm/TargetParser/Triple.h"
18 #include "llvm/Transforms/IPO/ThinLTOBitcodeWriter.h"
19 #include "llvm/Transforms/Utils/ModuleUtils.h"
20
21 #include <string>
22
23 using namespace llvm;
24
run(Module & M,ModuleAnalysisManager & AM)25 PreservedAnalyses EmbedBitcodePass::run(Module &M, ModuleAnalysisManager &AM) {
26 if (M.getGlobalVariable("llvm.embedded.module", /*AllowInternal=*/true))
27 reportFatalUsageError("Can only embed the module once");
28
29 Triple T(M.getTargetTriple());
30 if (T.getObjectFormat() != Triple::ELF)
31 reportFatalUsageError(
32 "EmbedBitcode pass currently only supports ELF object format");
33
34 std::string Data;
35 raw_string_ostream OS(Data);
36 if (IsThinLTO)
37 ThinLTOBitcodeWriterPass(OS, /*ThinLinkOS=*/nullptr).run(M, AM);
38 else
39 BitcodeWriterPass(OS, /*ShouldPreserveUseListOrder=*/false, EmitLTOSummary)
40 .run(M, AM);
41
42 embedBufferInModule(M, MemoryBufferRef(Data, "ModuleData"), ".llvm.lto");
43
44 return PreservedAnalyses::none();
45 }
46