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//===- NameMap.cpp - PDB Name Map -------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/SparseBitVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/DebugInfo/MSF/StreamReader.h"
#include "llvm/DebugInfo/PDB/Raw/NameMap.h"
#include "llvm/DebugInfo/PDB/Raw/RawError.h"
#include "llvm/Support/Error.h"
#include <algorithm>
#include <cstdint>
using namespace llvm;
using namespace llvm::msf;
using namespace llvm::pdb;
NameMap::NameMap() = default;
Error NameMap::load(StreamReader &Stream) {
// This is some sort of weird string-set/hash table encoded in the stream.
// It starts with the number of bytes in the table.
uint32_t NumberOfBytes;
if (auto EC = Stream.readInteger(NumberOfBytes))
return joinErrors(std::move(EC),
make_error<RawError>(raw_error_code::corrupt_file,
"Expected name map length"));
if (Stream.bytesRemaining() < NumberOfBytes)
return make_error<RawError>(raw_error_code::corrupt_file,
"Invalid name map length");
// Following that field is the starting offset of strings in the name table.
uint32_t StringsOffset = Stream.getOffset();
Stream.setOffset(StringsOffset + NumberOfBytes);
// This appears to be equivalent to the total number of strings *actually*
// in the name table.
uint32_t HashSize;
if (auto EC = Stream.readInteger(HashSize))
return joinErrors(std::move(EC),
make_error<RawError>(raw_error_code::corrupt_file,
"Expected name map hash size"));
// This appears to be an upper bound on the number of strings in the name
// table.
uint32_t MaxNumberOfStrings;
if (auto EC = Stream.readInteger(MaxNumberOfStrings))
return joinErrors(std::move(EC),
make_error<RawError>(raw_error_code::corrupt_file,
"Expected name map max strings"));
if (MaxNumberOfStrings > (UINT32_MAX / sizeof(uint32_t)))
return make_error<RawError>(raw_error_code::corrupt_file,
"Implausible number of strings");
const uint32_t MaxNumberOfWords = UINT32_MAX / (sizeof(uint32_t) * 8);
// This appears to be a hash table which uses bitfields to determine whether
// or not a bucket is 'present'.
uint32_t NumPresentWords;
if (auto EC = Stream.readInteger(NumPresentWords))
return joinErrors(std::move(EC),
make_error<RawError>(raw_error_code::corrupt_file,
"Expected name map num words"));
if (NumPresentWords > MaxNumberOfWords)
return make_error<RawError>(raw_error_code::corrupt_file,
"Number of present words is too large");
SparseBitVector<> Present;
for (uint32_t I = 0; I != NumPresentWords; ++I) {
uint32_t Word;
if (auto EC = Stream.readInteger(Word))
return joinErrors(std::move(EC),
make_error<RawError>(raw_error_code::corrupt_file,
"Expected name map word"));
for (unsigned Idx = 0; Idx < 32; ++Idx)
if (Word & (1U << Idx))
Present.set((I * 32) + Idx);
}
// This appears to be a hash table which uses bitfields to determine whether
// or not a bucket is 'deleted'.
uint32_t NumDeletedWords;
if (auto EC = Stream.readInteger(NumDeletedWords))
return joinErrors(
std::move(EC),
make_error<RawError>(raw_error_code::corrupt_file,
"Expected name map num deleted words"));
if (NumDeletedWords > MaxNumberOfWords)
return make_error<RawError>(raw_error_code::corrupt_file,
"Number of deleted words is too large");
SparseBitVector<> Deleted;
for (uint32_t I = 0; I != NumDeletedWords; ++I) {
uint32_t Word;
if (auto EC = Stream.readInteger(Word))
return joinErrors(std::move(EC),
make_error<RawError>(raw_error_code::corrupt_file,
"Expected name map word"));
for (unsigned Idx = 0; Idx < 32; ++Idx)
if (Word & (1U << Idx))
Deleted.set((I * 32) + Idx);
}
for (unsigned I : Present) {
// For all present entries, dump out their mapping.
(void)I;
// This appears to be an offset relative to the start of the strings.
// It tells us where the null-terminated string begins.
uint32_t NameOffset;
if (auto EC = Stream.readInteger(NameOffset))
return joinErrors(std::move(EC),
make_error<RawError>(raw_error_code::corrupt_file,
"Expected name map name offset"));
// This appears to be a stream number into the stream directory.
uint32_t NameIndex;
if (auto EC = Stream.readInteger(NameIndex))
return joinErrors(std::move(EC),
make_error<RawError>(raw_error_code::corrupt_file,
"Expected name map name index"));
// Compute the offset of the start of the string relative to the stream.
uint32_t StringOffset = StringsOffset + NameOffset;
uint32_t OldOffset = Stream.getOffset();
// Pump out our c-string from the stream.
StringRef Str;
Stream.setOffset(StringOffset);
if (auto EC = Stream.readZeroString(Str))
return joinErrors(std::move(EC),
make_error<RawError>(raw_error_code::corrupt_file,
"Expected name map name"));
Stream.setOffset(OldOffset);
// Add this to a string-map from name to stream number.
Mapping.insert({Str, NameIndex});
}
return Error::success();
}
iterator_range<StringMapConstIterator<uint32_t>> NameMap::entries() const {
return make_range<StringMapConstIterator<uint32_t>>(Mapping.begin(),
Mapping.end());
}
bool NameMap::tryGetValue(StringRef Name, uint32_t &Value) const {
auto Iter = Mapping.find(Name);
if (Iter == Mapping.end())
return false;
Value = Iter->second;
return true;
}
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