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//===- MergedFunctionsInfo.cpp ----------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/GSYM/MergedFunctionsInfo.h"
#include "llvm/DebugInfo/GSYM/FileWriter.h"
#include "llvm/DebugInfo/GSYM/FunctionInfo.h"
#include "llvm/Support/DataExtractor.h"
using namespace llvm;
using namespace gsym;
void MergedFunctionsInfo::clear() { MergedFunctions.clear(); }
llvm::Error MergedFunctionsInfo::encode(FileWriter &Out) const {
Out.writeU32(MergedFunctions.size());
for (const auto &F : MergedFunctions) {
Out.writeU32(0);
const auto StartOffset = Out.tell();
// Encode the FunctionInfo with no padding so later we can just read them
// one after the other without knowing the offset in the stream for each.
llvm::Expected<uint64_t> result = F.encode(Out, /*NoPadding =*/true);
if (!result)
return result.takeError();
const auto Length = Out.tell() - StartOffset;
Out.fixup32(static_cast<uint32_t>(Length), StartOffset - 4);
}
return Error::success();
}
llvm::Expected<MergedFunctionsInfo>
MergedFunctionsInfo::decode(DataExtractor &Data, uint64_t BaseAddr) {
MergedFunctionsInfo MFI;
auto FuncExtractorsOrError = MFI.getFuncsDataExtractors(Data);
if (!FuncExtractorsOrError)
return FuncExtractorsOrError.takeError();
for (DataExtractor &FuncData : *FuncExtractorsOrError) {
llvm::Expected<FunctionInfo> FI = FunctionInfo::decode(FuncData, BaseAddr);
if (!FI)
return FI.takeError();
MFI.MergedFunctions.push_back(std::move(*FI));
}
return MFI;
}
llvm::Expected<std::vector<DataExtractor>>
MergedFunctionsInfo::getFuncsDataExtractors(DataExtractor &Data) {
std::vector<DataExtractor> Results;
uint64_t Offset = 0;
// Ensure there is enough data to read the function count.
if (!Data.isValidOffsetForDataOfSize(Offset, 4))
return createStringError(
std::errc::io_error,
"unable to read the function count at offset 0x%8.8" PRIx64, Offset);
uint32_t Count = Data.getU32(&Offset);
for (uint32_t i = 0; i < Count; ++i) {
// Ensure there is enough data to read the function size.
if (!Data.isValidOffsetForDataOfSize(Offset, 4))
return createStringError(
std::errc::io_error,
"unable to read size of function %u at offset 0x%8.8" PRIx64, i,
Offset);
uint32_t FnSize = Data.getU32(&Offset);
// Ensure there is enough data for the function content.
if (!Data.isValidOffsetForDataOfSize(Offset, FnSize))
return createStringError(
std::errc::io_error,
"function data is truncated for function %u at offset 0x%8.8" PRIx64
", expected size %u",
i, Offset, FnSize);
// Extract the function data.
Results.emplace_back(Data.getData().substr(Offset, FnSize),
Data.isLittleEndian(), Data.getAddressSize());
Offset += FnSize;
}
return Results;
}
bool operator==(const MergedFunctionsInfo &LHS,
const MergedFunctionsInfo &RHS) {
return LHS.MergedFunctions == RHS.MergedFunctions;
}
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