mirror of
https://github.com/RPCS3/llvm.git
synced 2025-04-08 08:21:54 +00:00
288180ac40
Previously we had knowledge of how to serialize and deserialize a string table inside of DebugInfo/PDB, but the string table that it serializes contains a piece that is actually considered CodeView and can appear outside of a PDB. We already have logic in llvm-readobj and MCCodeView to read and write this format, so it doesn't make sense to duplicate the logic in DebugInfoPDB as well. This patch makes codeview::StringTable (for writing) and codeview::StringTableRef (for reading), updates DebugInfoPDB to use these classes for its own writing, and updates llvm-readobj to additionally use StringTableRef for reading. It's a bit more difficult to get MCCodeView to use this for writing, but it's a logical next step. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301986 91177308-0d34-0410-b5e6-96231b3b80d8
108 lines
3.2 KiB
C++
108 lines
3.2 KiB
C++
//===- BinaryStreamReader.cpp - Reads objects from a binary stream --------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Support/BinaryStreamReader.h"
|
|
|
|
#include "llvm/Support/BinaryStreamError.h"
|
|
#include "llvm/Support/BinaryStreamRef.h"
|
|
|
|
using namespace llvm;
|
|
|
|
BinaryStreamReader::BinaryStreamReader(BinaryStreamRef S)
|
|
: Stream(S), Offset(0) {}
|
|
|
|
Error BinaryStreamReader::readLongestContiguousChunk(
|
|
ArrayRef<uint8_t> &Buffer) {
|
|
if (auto EC = Stream.readLongestContiguousChunk(Offset, Buffer))
|
|
return EC;
|
|
Offset += Buffer.size();
|
|
return Error::success();
|
|
}
|
|
|
|
Error BinaryStreamReader::readBytes(ArrayRef<uint8_t> &Buffer, uint32_t Size) {
|
|
if (auto EC = Stream.readBytes(Offset, Size, Buffer))
|
|
return EC;
|
|
Offset += Size;
|
|
return Error::success();
|
|
}
|
|
|
|
Error BinaryStreamReader::readCString(StringRef &Dest) {
|
|
// TODO: This could be made more efficient by using readLongestContiguousChunk
|
|
// and searching for null terminators in the resulting buffer.
|
|
|
|
uint32_t Length = 0;
|
|
// First compute the length of the string by reading 1 byte at a time.
|
|
uint32_t OriginalOffset = getOffset();
|
|
const char *C;
|
|
while (true) {
|
|
if (auto EC = readObject(C))
|
|
return EC;
|
|
if (*C == '\0')
|
|
break;
|
|
++Length;
|
|
}
|
|
// Now go back and request a reference for that many bytes.
|
|
uint32_t NewOffset = getOffset();
|
|
setOffset(OriginalOffset);
|
|
|
|
if (auto EC = readFixedString(Dest, Length))
|
|
return EC;
|
|
|
|
// Now set the offset back to where it was after we calculated the length.
|
|
setOffset(NewOffset);
|
|
return Error::success();
|
|
}
|
|
|
|
Error BinaryStreamReader::readFixedString(StringRef &Dest, uint32_t Length) {
|
|
ArrayRef<uint8_t> Bytes;
|
|
if (auto EC = readBytes(Bytes, Length))
|
|
return EC;
|
|
Dest = StringRef(reinterpret_cast<const char *>(Bytes.begin()), Bytes.size());
|
|
return Error::success();
|
|
}
|
|
|
|
Error BinaryStreamReader::readStreamRef(BinaryStreamRef &Ref) {
|
|
return readStreamRef(Ref, bytesRemaining());
|
|
}
|
|
|
|
Error BinaryStreamReader::readStreamRef(BinaryStreamRef &Ref, uint32_t Length) {
|
|
if (bytesRemaining() < Length)
|
|
return make_error<BinaryStreamError>(stream_error_code::stream_too_short);
|
|
Ref = Stream.slice(Offset, Length);
|
|
Offset += Length;
|
|
return Error::success();
|
|
}
|
|
|
|
Error BinaryStreamReader::skip(uint32_t Amount) {
|
|
if (Amount > bytesRemaining())
|
|
return make_error<BinaryStreamError>(stream_error_code::stream_too_short);
|
|
Offset += Amount;
|
|
return Error::success();
|
|
}
|
|
|
|
uint8_t BinaryStreamReader::peek() const {
|
|
ArrayRef<uint8_t> Buffer;
|
|
auto EC = Stream.readBytes(Offset, 1, Buffer);
|
|
assert(!EC && "Cannot peek an empty buffer!");
|
|
llvm::consumeError(std::move(EC));
|
|
return Buffer[0];
|
|
}
|
|
|
|
std::pair<BinaryStreamReader, BinaryStreamReader>
|
|
BinaryStreamReader::split(uint32_t Off) const {
|
|
assert(getLength() >= Off);
|
|
|
|
BinaryStreamRef First = Stream.drop_front(Offset);
|
|
|
|
BinaryStreamRef Second = First.drop_front(Off);
|
|
First = First.keep_front(Off);
|
|
BinaryStreamReader W1{First};
|
|
BinaryStreamReader W2{Second};
|
|
return std::make_pair(W1, W2);
|
|
} |