1 //===- WasmObjcopy.cpp ----------------------------------------------------===//
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 "WasmObjcopy.h"
10 #include "CommonConfig.h"
11 #include "Object.h"
12 #include "Reader.h"
13 #include "Writer.h"
14 #include "llvm/Support/Errc.h"
15 #include "llvm/Support/FileOutputBuffer.h"
16
17 namespace llvm {
18 namespace objcopy {
19 namespace wasm {
20
21 using namespace object;
22
dumpSectionToFile(StringRef SecName,StringRef Filename,Object & Obj)23 static Error dumpSectionToFile(StringRef SecName, StringRef Filename,
24 Object &Obj) {
25 for (const Section &Sec : Obj.Sections) {
26 if (Sec.Name == SecName) {
27 ArrayRef<uint8_t> Contents = Sec.Contents;
28 Expected<std::unique_ptr<FileOutputBuffer>> BufferOrErr =
29 FileOutputBuffer::create(Filename, Contents.size());
30 if (!BufferOrErr)
31 return BufferOrErr.takeError();
32 std::unique_ptr<FileOutputBuffer> Buf = std::move(*BufferOrErr);
33 std::copy(Contents.begin(), Contents.end(), Buf->getBufferStart());
34 if (Error E = Buf->commit())
35 return E;
36 return Error::success();
37 }
38 }
39 return createStringError(errc::invalid_argument, "section '%s' not found",
40 SecName.str().c_str());
41 }
handleArgs(const CommonConfig & Config,Object & Obj)42 static Error handleArgs(const CommonConfig &Config, Object &Obj) {
43 // Only support AddSection, DumpSection, RemoveSection for now.
44 for (StringRef Flag : Config.DumpSection) {
45 StringRef SecName;
46 StringRef FileName;
47 std::tie(SecName, FileName) = Flag.split("=");
48 if (Error E = dumpSectionToFile(SecName, FileName, Obj))
49 return createFileError(FileName, std::move(E));
50 }
51
52 Obj.removeSections([&Config](const Section &Sec) {
53 if (Config.ToRemove.matches(Sec.Name))
54 return true;
55 return false;
56 });
57
58 for (StringRef Flag : Config.AddSection) {
59 StringRef SecName, FileName;
60 std::tie(SecName, FileName) = Flag.split("=");
61 ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr =
62 MemoryBuffer::getFile(FileName);
63 if (!BufOrErr)
64 return createFileError(FileName, errorCodeToError(BufOrErr.getError()));
65 Section Sec;
66 Sec.SectionType = llvm::wasm::WASM_SEC_CUSTOM;
67 Sec.Name = SecName;
68 std::unique_ptr<MemoryBuffer> Buf = std::move(*BufOrErr);
69 Sec.Contents = makeArrayRef<uint8_t>(
70 reinterpret_cast<const uint8_t *>(Buf->getBufferStart()),
71 Buf->getBufferSize());
72 Obj.addSectionWithOwnedContents(Sec, std::move(Buf));
73 }
74
75 return Error::success();
76 }
77
executeObjcopyOnBinary(const CommonConfig & Config,const WasmConfig &,object::WasmObjectFile & In,raw_ostream & Out)78 Error executeObjcopyOnBinary(const CommonConfig &Config, const WasmConfig &,
79 object::WasmObjectFile &In, raw_ostream &Out) {
80 Reader TheReader(In);
81 Expected<std::unique_ptr<Object>> ObjOrErr = TheReader.create();
82 if (!ObjOrErr)
83 return createFileError(Config.InputFilename, ObjOrErr.takeError());
84 Object *Obj = ObjOrErr->get();
85 assert(Obj && "Unable to deserialize Wasm object");
86 if (Error E = handleArgs(Config, *Obj))
87 return E;
88 Writer TheWriter(*Obj, Out);
89 if (Error E = TheWriter.write())
90 return createFileError(Config.OutputFilename, std::move(E));
91 return Error::success();
92 }
93
94 } // end namespace wasm
95 } // end namespace objcopy
96 } // end namespace llvm
97