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//==- Deserialize.cpp - Generic Object Serialization to Bitcode --*- C++ -*-==//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Ted Kremenek and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the internal methods used for object serialization.
//
//===----------------------------------------------------------------------===//
#include "llvm/Bitcode/Deserialize.h"
#ifdef DEBUG_BACKPATCH
#include "llvm/Support/Streams.h"
#endif
using namespace llvm;
Deserializer::Deserializer(BitstreamReader& stream)
: Stream(stream), RecIdx(0), FreeList(NULL) {
}
Deserializer::~Deserializer() {
assert (RecIdx >= Record.size() &&
"Still scanning bitcode record when deserialization completed.");
#ifdef NDEBUG
for (MapTy::iterator I=BPatchMap.begin(), E=BPatchMap.end(); I!=E; ++I)
assert (I->first.hasFinalPtr() &&
"Some pointers were not backpatched.");
#endif
}
bool Deserializer::inRecord() {
if (Record.size() > 0) {
if (RecIdx >= Record.size()) {
RecIdx = 0;
Record.clear();
return false;
}
else return true;
}
else return false;
}
void Deserializer::ReadRecord() {
// FIXME: Check if we haven't run off the edge of the stream.
// FIXME: Handle abbreviations.
assert (Record.size() == 0);
unsigned Code;
while (true) {
if (Stream.AtEndOfStream())
return;
Code = Stream.ReadCode();
if (Code == bitc::ENTER_SUBBLOCK) {
// No known subblocks, always skip them.
unsigned id = Stream.ReadSubBlockID();
Stream.EnterSubBlock(id);
continue;
}
if (Code == bitc::END_BLOCK) {
bool x = Stream.ReadBlockEnd();
assert (!x && "Error at block end.");
continue;
}
if (Code == bitc::DEFINE_ABBREV) {
Stream.ReadAbbrevRecord();
continue;
}
break;
}
assert (Record.size() == 0);
Stream.ReadRecord(Code,Record);
assert (Record.size() > 0 || Stream.AtEndOfStream());
}
bool Deserializer::AtEnd() {
if (inRecord())
return false;
ReadRecord();
return Stream.AtEndOfStream();
}
uint64_t Deserializer::ReadInt() {
// FIXME: Any error recovery/handling with incomplete or bad files?
if (!inRecord())
ReadRecord();
return Record[RecIdx++];
}
char* Deserializer::ReadCStr(char* cstr, unsigned MaxLen, bool isNullTerm) {
if (cstr == NULL)
MaxLen = 0; // Zero this just in case someone does something funny.
unsigned len = ReadInt();
assert (MaxLen == 0 || (len + (isNullTerm ? 1 : 0)) <= MaxLen);
if (!cstr)
cstr = new char[len + (isNullTerm ? 1 : 0)];
assert (cstr != NULL);
for (unsigned i = 0; i < len; ++i)
cstr[i] = (char) ReadInt();
if (isNullTerm)
cstr[len+1] = '\0';
return cstr;
}
void Deserializer::ReadCStr(std::vector<char>& buff, bool isNullTerm) {
unsigned len = ReadInt();
buff.clear();
buff.reserve(len);
for (unsigned i = 0; i < len; ++i)
buff.push_back((char) ReadInt());
if (isNullTerm)
buff.push_back('\0');
}
void Deserializer::RegisterPtr(unsigned PtrId, const void* Ptr) {
MapTy::value_type& E = BPatchMap.FindAndConstruct(BPKey(PtrId));
assert (!HasFinalPtr(E) && "Pointer already registered.");
#ifdef DEBUG_BACKPATCH
llvm::cerr << "RegisterPtr: " << PtrId << " => " << Ptr << "\n";
#endif
SetPtr(E,Ptr);
}
void Deserializer::ReadUIntPtr(uintptr_t& PtrRef, bool AllowBackpatch) {
unsigned PtrId = ReadInt();
if (PtrId == 0) {
PtrRef = 0;
return;
}
#ifdef DEBUG_BACKPATCH
llvm::cerr << "ReadUintPtr: " << PtrId << "\n";
#endif
MapTy::value_type& E = BPatchMap.FindAndConstruct(BPKey(PtrId));
if (HasFinalPtr(E))
PtrRef = GetFinalPtr(E);
else {
assert (AllowBackpatch &&
"Client forbids backpatching for this pointer.");
// Register backpatch. Check the freelist for a BPNode.
BPNode* N;
if (FreeList) {
N = FreeList;
FreeList = FreeList->Next;
}
else // No available BPNode. Allocate one.
N = (BPNode*) Allocator.Allocate<BPNode>();
new (N) BPNode(GetBPNode(E),PtrRef);
SetBPNode(E,N);
}
}
uintptr_t Deserializer::ReadInternalRefPtr() {
unsigned PtrId = ReadInt();
assert (PtrId != 0 && "References cannot refer the NULL address.");
MapTy::value_type& E = BPatchMap.FindAndConstruct(BPKey(PtrId));
assert (HasFinalPtr(E) &&
"Cannot backpatch references. Object must be already deserialized.");
return GetFinalPtr(E);
}
void Deserializer::BPEntry::SetPtr(BPNode*& FreeList, void* P) {
BPNode* Last = NULL;
for (BPNode* N = Head; N != NULL; N=N->Next) {
Last = N;
N->PtrRef |= reinterpret_cast<uintptr_t>(P);
}
if (Last) {
Last->Next = FreeList;
FreeList = Head;
}
Ptr = const_cast<void*>(P);
}
#define INT_READ(TYPE)\
void SerializeTrait<TYPE>::Read(Deserializer& D, TYPE& X) {\
X = (TYPE) D.ReadInt(); }
INT_READ(bool)
INT_READ(unsigned char)
INT_READ(unsigned short)
INT_READ(unsigned int)
INT_READ(unsigned long)
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