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llvm/lib/Bytecode/Reader/Reader.cpp
Chris Lattner 4ee8ef2a5d This patch substantially simplifies and cleans up handling of basic blocks 
in the bytecode parser.  Before we tried to shoehorn basic blocks into the
"getValue" code path with other types of values.  For a variety of reasons
this was a bad idea, so this patch separates it out into its own data structure.

This simplifies the code, makes it fit in 80 columns, and is also much faster.
In a testcase provided by Bill, which has lots of PHI nodes, this patch speeds
up bytecode parsing from taking 6.9s to taking 2.32s.  More speedups to
follow later.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8977 91177308-0d34-0410-b5e6-96231b3b80d8
2003-10-08 22:52:54 +00:00

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//===- Reader.cpp - Code to read bytecode files ---------------------------===//
//
// This library implements the functionality defined in llvm/Bytecode/Reader.h
//
// Note that this library should be as fast as possible, reentrant, and
// threadsafe!!
//
// TODO: Return error messages to caller instead of printing them out directly.
// TODO: Allow passing in an option to ignore the symbol table
//
//===----------------------------------------------------------------------===//
#include "ReaderInternals.h"
#include "llvm/Bytecode/Reader.h"
#include "llvm/Bytecode/Format.h"
#include "llvm/Constants.h"
#include "llvm/iPHINode.h"
#include "llvm/iOther.h"
#include "llvm/Module.h"
#include "Support/StringExtras.h"
#include "Config/unistd.h"
#include "Config/sys/mman.h"
#include "Config/sys/stat.h"
#include "Config/sys/types.h"
#include <algorithm>
#include <memory>
static inline void ALIGN32(const unsigned char *&begin,
const unsigned char *end) {
if (align32(begin, end))
throw std::string("Alignment error in buffer: read past end of block.");
}
unsigned BytecodeParser::getTypeSlot(const Type *Ty) {
if (Ty->isPrimitiveType())
return Ty->getPrimitiveID();
// Check the function level types first...
TypeValuesListTy::iterator I = find(FunctionTypeValues.begin(),
FunctionTypeValues.end(), Ty);
if (I != FunctionTypeValues.end())
return FirstDerivedTyID + ModuleTypeValues.size() +
(&*I - &FunctionTypeValues[0]);
I = find(ModuleTypeValues.begin(), ModuleTypeValues.end(), Ty);
if (I == ModuleTypeValues.end())
throw std::string("Didn't find type in ModuleTypeValues.");
return FirstDerivedTyID + (&*I - &ModuleTypeValues[0]);
}
const Type *BytecodeParser::getType(unsigned ID) {
if (ID < Type::NumPrimitiveIDs) {
const Type *T = Type::getPrimitiveType((Type::PrimitiveID)ID);
if (T) return T;
}
//cerr << "Looking up Type ID: " << ID << "\n";
if (ID < Type::NumPrimitiveIDs) {
const Type *T = Type::getPrimitiveType((Type::PrimitiveID)ID);
if (T) return T; // Asked for a primitive type...
}
// Otherwise, derived types need offset...
ID -= FirstDerivedTyID;
// Is it a module-level type?
if (ID < ModuleTypeValues.size())
return ModuleTypeValues[ID].get();
// Nope, is it a function-level type?
ID -= ModuleTypeValues.size();
if (ID < FunctionTypeValues.size())
return FunctionTypeValues[ID].get();
return 0;
}
int BytecodeParser::insertValue(Value *Val, ValueTable &ValueTab) {
assert((!HasImplicitZeroInitializer || !isa<Constant>(Val) ||
Val->getType()->isPrimitiveType() ||
!cast<Constant>(Val)->isNullValue()) &&
"Cannot read null values from bytecode!");
unsigned type = getTypeSlot(Val->getType());
assert(type != Type::TypeTyID && "Types should never be insertValue'd!");
if (ValueTab.size() <= type) {
unsigned OldSize = ValueTab.size();
ValueTab.resize(type+1);
while (OldSize != type+1)
ValueTab[OldSize++] = new ValueList();
}
//cerr << "insertValue Values[" << type << "][" << ValueTab[type].size()
// << "] = " << Val << "\n";
ValueTab[type]->push_back(Val);
bool HasOffset = HasImplicitZeroInitializer &&
!Val->getType()->isPrimitiveType();
return ValueTab[type]->size()-1 + HasOffset;
}
void BytecodeParser::setValueTo(ValueTable &ValueTab, unsigned Slot,
Value *Val) {
assert(&ValueTab == &ModuleValues && "Can only setValueTo on Module values!");
assert((!HasImplicitZeroInitializer || Slot != 0) &&
"Cannot change zero init");
unsigned type = getTypeSlot(Val->getType());
assert(type < ValueTab.size() && Slot <= ValueTab[type]->size());
ValueTab[type]->setOperand(Slot-HasImplicitZeroInitializer, Val);
}
Value *BytecodeParser::getValue(const Type *Ty, unsigned oNum, bool Create) {
return getValue(getTypeSlot(Ty), oNum, Create);
}
Value *BytecodeParser::getValue(unsigned type, unsigned oNum, bool Create) {
assert(type != Type::TypeTyID && "getValue() cannot get types!");
assert(type != Type::LabelTyID && "getValue() cannot get blocks!");
unsigned Num = oNum;
if (HasImplicitZeroInitializer && type >= FirstDerivedTyID) {
if (Num == 0)
return Constant::getNullValue(getType(type));
--Num;
}
if (type < ModuleValues.size()) {
if (Num < ModuleValues[type]->size())
return ModuleValues[type]->getOperand(Num);
Num -= ModuleValues[type]->size();
}
if (Values.size() > type && Values[type]->size() > Num)
return Values[type]->getOperand(Num);
if (!Create) return 0; // Do not create a placeholder?
Value *Val = new ValPHolder(getType(type), oNum);
if (insertValue(Val, LateResolveValues) == -1) return 0;
return Val;
}
/// getBasicBlock - Get a particular numbered basic block, which might be a
/// forward reference. This works together with ParseBasicBlock to handle these
/// forward references in a clean manner.
///
BasicBlock *BytecodeParser::getBasicBlock(unsigned ID) {
// Make sure there is room in the table...
if (ParsedBasicBlocks.size() <= ID) ParsedBasicBlocks.resize(ID+1);
// First check to see if this is a backwards reference, i.e., ParseBasicBlock
// has already created this block, or if the forward reference has already
// been created.
if (ParsedBasicBlocks[ID])
return ParsedBasicBlocks[ID];
// Otherwise, the basic block has not yet been created. Do so and add it to
// the ParsedBasicBlocks list.
return ParsedBasicBlocks[ID] = new BasicBlock();
}
/// getConstantValue - Just like getValue, except that it returns a null pointer
/// only on error. It always returns a constant (meaning that if the value is
/// defined, but is not a constant, that is an error). If the specified
/// constant hasn't been parsed yet, a placeholder is defined and used. Later,
/// after the real value is parsed, the placeholder is eliminated.
///
Constant *BytecodeParser::getConstantValue(const Type *Ty, unsigned Slot) {
if (Value *V = getValue(Ty, Slot, false))
return dyn_cast<Constant>(V); // If we already have the value parsed...
std::pair<const Type*, unsigned> Key(Ty, Slot);
GlobalRefsType::iterator I = GlobalRefs.lower_bound(Key);
if (I != GlobalRefs.end() && I->first == Key) {
BCR_TRACE(5, "Previous forward ref found!\n");
return cast<Constant>(I->second);
} else {
// Create a placeholder for the constant reference and
// keep track of the fact that we have a forward ref to recycle it
BCR_TRACE(5, "Creating new forward ref to a constant!\n");
Constant *C = new ConstPHolder(Ty, Slot);
// Keep track of the fact that we have a forward ref to recycle it
GlobalRefs.insert(I, std::make_pair(Key, C));
return C;
}
}
BasicBlock *BytecodeParser::ParseBasicBlock(const unsigned char *&Buf,
const unsigned char *EndBuf,
unsigned BlockNo) {
BasicBlock *BB;
if (ParsedBasicBlocks.size() == BlockNo)
ParsedBasicBlocks.push_back(BB = new BasicBlock());
else if (ParsedBasicBlocks[BlockNo] == 0)
BB = ParsedBasicBlocks[BlockNo] = new BasicBlock();
else
BB = ParsedBasicBlocks[BlockNo];
while (Buf < EndBuf) {
Instruction *Inst;
ParseInstruction(Buf, EndBuf, Inst);
if (Inst == 0) { throw std::string("Could not parse Instruction."); }
if (insertValue(Inst, Values) == -1) {
throw std::string("Could not insert value.");
}
BB->getInstList().push_back(Inst);
BCR_TRACE(4, Inst);
}
return BB;
}
void BytecodeParser::ParseSymbolTable(const unsigned char *&Buf,
const unsigned char *EndBuf,
SymbolTable *ST,
Function *CurrentFunction) {
while (Buf < EndBuf) {
// Symtab block header: [num entries][type id number]
unsigned NumEntries, Typ;
if (read_vbr(Buf, EndBuf, NumEntries) ||
read_vbr(Buf, EndBuf, Typ)) throw Error_readvbr;
const Type *Ty = getType(Typ);
if (Ty == 0) throw std::string("Invalid type read in symbol table.");
BCR_TRACE(3, "Plane Type: '" << Ty << "' with " << NumEntries <<
" entries\n");
for (unsigned i = 0; i < NumEntries; ++i) {
// Symtab entry: [def slot #][name]
unsigned slot;
if (read_vbr(Buf, EndBuf, slot)) throw Error_readvbr;
std::string Name;
if (read(Buf, EndBuf, Name, false)) // Not aligned...
throw std::string("Buffer not aligned.");
Value *V = 0;
if (Typ == Type::TypeTyID)
V = (Value*)getType(slot);
else if (Typ == Type::LabelTyID) {
if (CurrentFunction) {
// FIXME: THIS IS N^2!!!
Function::iterator BlockIterator = CurrentFunction->begin();
std::advance(BlockIterator, slot);
V = BlockIterator;
}
} else
V = getValue(Typ, slot, false); // Find mapping...
if (V == 0) throw std::string("Failed value look-up.");
BCR_TRACE(4, "Map: '" << Name << "' to #" << slot << ":" << *V;
if (!isa<Instruction>(V)) std::cerr << "\n");
V->setName(Name, ST);
}
}
if (Buf > EndBuf) throw std::string("Tried to read past end of buffer.");
}
void BytecodeParser::ResolveReferencesToValue(Value *NewV, unsigned Slot) {
GlobalRefsType::iterator I = GlobalRefs.find(std::make_pair(NewV->getType(),
Slot));
if (I == GlobalRefs.end()) return; // Never forward referenced?
BCR_TRACE(3, "Mutating forward refs!\n");
Value *VPH = I->second; // Get the placeholder...
VPH->replaceAllUsesWith(NewV);
// If this is a global variable being resolved, remove the placeholder from
// the module...
if (GlobalValue* GVal = dyn_cast<GlobalValue>(NewV))
GVal->getParent()->getGlobalList().remove(cast<GlobalVariable>(VPH));
delete VPH; // Delete the old placeholder
GlobalRefs.erase(I); // Remove the map entry for it
}
void BytecodeParser::ParseFunction(const unsigned char *&Buf,
const unsigned char *EndBuf) {
if (FunctionSignatureList.empty())
throw std::string("FunctionSignatureList empty!");
Function *F = FunctionSignatureList.back().first;
unsigned FunctionSlot = FunctionSignatureList.back().second;
FunctionSignatureList.pop_back();
// Save the information for future reading of the function
LazyFunctionInfo *LFI = new LazyFunctionInfo();
LFI->Buf = Buf; LFI->EndBuf = EndBuf; LFI->FunctionSlot = FunctionSlot;
LazyFunctionLoadMap[F] = LFI;
// Pretend we've `parsed' this function
Buf = EndBuf;
}
void BytecodeParser::materializeFunction(Function* F) {
// Find {start, end} pointers and slot in the map. If not there, we're done.
std::map<Function*, LazyFunctionInfo*>::iterator Fi =
LazyFunctionLoadMap.find(F);
if (Fi == LazyFunctionLoadMap.end()) return;
LazyFunctionInfo *LFI = Fi->second;
const unsigned char *Buf = LFI->Buf;
const unsigned char *EndBuf = LFI->EndBuf;
unsigned FunctionSlot = LFI->FunctionSlot;
LazyFunctionLoadMap.erase(Fi);
delete LFI;
GlobalValue::LinkageTypes Linkage = GlobalValue::ExternalLinkage;
if (!hasInternalMarkerOnly) {
unsigned LinkageType;
if (read_vbr(Buf, EndBuf, LinkageType))
throw std::string("ParseFunction: Error reading from buffer.");
if (LinkageType & ~0x3)
throw std::string("Invalid linkage type for Function.");
Linkage = (GlobalValue::LinkageTypes)LinkageType;
} else {
// We used to only support two linkage models: internal and external
unsigned isInternal;
if (read_vbr(Buf, EndBuf, isInternal))
throw std::string("ParseFunction: Error reading from buffer.");
if (isInternal) Linkage = GlobalValue::InternalLinkage;
}
F->setLinkage(Linkage);
const FunctionType::ParamTypes &Params =F->getFunctionType()->getParamTypes();
Function::aiterator AI = F->abegin();
for (FunctionType::ParamTypes::const_iterator It = Params.begin();
It != Params.end(); ++It, ++AI) {
if (insertValue(AI, Values) == -1)
throw std::string("Error reading function arguments!");
}
// Keep track of how many basic blocks we have read in...
unsigned BlockNum = 0;
while (Buf < EndBuf) {
unsigned Type, Size;
const unsigned char *OldBuf = Buf;
readBlock(Buf, EndBuf, Type, Size);
switch (Type) {
case BytecodeFormat::ConstantPool: {
BCR_TRACE(2, "BLOCK BytecodeFormat::ConstantPool: {\n");
ParseConstantPool(Buf, Buf+Size, Values, FunctionTypeValues);
break;
}
case BytecodeFormat::BasicBlock: {
BCR_TRACE(2, "BLOCK BytecodeFormat::BasicBlock: {\n");
BasicBlock *BB = ParseBasicBlock(Buf, Buf+Size, BlockNum++);
F->getBasicBlockList().push_back(BB);
break;
}
case BytecodeFormat::SymbolTable: {
BCR_TRACE(2, "BLOCK BytecodeFormat::SymbolTable: {\n");
ParseSymbolTable(Buf, Buf+Size, &F->getSymbolTable(), F);
break;
}
default:
BCR_TRACE(2, "BLOCK <unknown>:ignored! {\n");
Buf += Size;
if (OldBuf > Buf)
throw std::string("Wrapped around reading bytecode.");
break;
}
BCR_TRACE(2, "} end block\n");
// Malformed bc file if read past end of block.
ALIGN32(Buf, EndBuf);
}
// Make sure there were no references to non-existant basic blocks.
if (BlockNum != ParsedBasicBlocks.size())
throw std::string("Illegal basic block operand reference");
ParsedBasicBlocks.clear();
// Check for unresolvable references
while (!LateResolveValues.empty()) {
ValueList &VL = *LateResolveValues.back();
LateResolveValues.pop_back();
while (!VL.empty()) {
Value *V = VL.back();
unsigned IDNumber = getValueIDNumberFromPlaceHolder(V);
VL.pop_back();
Value *NewVal = getValue(V->getType(), IDNumber, false);
if (NewVal == 0)
throw std::string("Unresolvable reference found: <" +
V->getType()->getDescription() + ">:" +
utostr(IDNumber) + ".");
// Fixup all of the uses of this placeholder def...
V->replaceAllUsesWith(NewVal);
// Now that all the uses are gone, delete the placeholder...
// If we couldn't find a def (error case), then leak a little
// memory, because otherwise we can't remove all uses!
delete V;
}
delete &VL;
}
// Clear out function-level types...
FunctionTypeValues.clear();
freeTable(Values);
}
void BytecodeParser::ParseModuleGlobalInfo(const unsigned char *&Buf,
const unsigned char *End) {
if (!FunctionSignatureList.empty())
throw std::string("Two ModuleGlobalInfo packets found!");
// Read global variables...
unsigned VarType;
if (read_vbr(Buf, End, VarType)) throw Error_readvbr;
while (VarType != Type::VoidTyID) { // List is terminated by Void
unsigned SlotNo;
GlobalValue::LinkageTypes Linkage;
if (!hasInternalMarkerOnly) {
// VarType Fields: bit0 = isConstant, bit1 = hasInitializer,
// bit2,3 = Linkage, bit4+ = slot#
SlotNo = VarType >> 4;
Linkage = (GlobalValue::LinkageTypes)((VarType >> 2) & 3);
} else {
// VarType Fields: bit0 = isConstant, bit1 = hasInitializer,
// bit2 = isInternal, bit3+ = slot#
SlotNo = VarType >> 3;
Linkage = (VarType & 4) ? GlobalValue::InternalLinkage :
GlobalValue::ExternalLinkage;
}
const Type *Ty = getType(SlotNo);
if (!Ty || !isa<PointerType>(Ty))
throw std::string("Global not pointer type! Ty = " +
Ty->getDescription());
const Type *ElTy = cast<PointerType>(Ty)->getElementType();
// Create the global variable...
GlobalVariable *GV = new GlobalVariable(ElTy, VarType & 1, Linkage,
0, "", TheModule);
int DestSlot = insertValue(GV, ModuleValues);
if (DestSlot == -1) throw Error_DestSlot;
BCR_TRACE(2, "Global Variable of type: " << *Ty << "\n");
ResolveReferencesToValue(GV, (unsigned)DestSlot);
if (VarType & 2) { // Does it have an initializer?
unsigned InitSlot;
if (read_vbr(Buf, End, InitSlot)) throw Error_readvbr;
GlobalInits.push_back(std::make_pair(GV, InitSlot));
}
if (read_vbr(Buf, End, VarType)) throw Error_readvbr;
}
// Read the function objects for all of the functions that are coming
unsigned FnSignature;
if (read_vbr(Buf, End, FnSignature)) throw Error_readvbr;
while (FnSignature != Type::VoidTyID) { // List is terminated by Void
const Type *Ty = getType(FnSignature);
if (!Ty || !isa<PointerType>(Ty) ||
!isa<FunctionType>(cast<PointerType>(Ty)->getElementType())) {
throw std::string("Function not ptr to func type! Ty = " +
Ty->getDescription());
}
// We create functions by passing the underlying FunctionType to create...
Ty = cast<PointerType>(Ty)->getElementType();
// When the ModuleGlobalInfo section is read, we load the type of each
// function and the 'ModuleValues' slot that it lands in. We then load a
// placeholder into its slot to reserve it. When the function is loaded,
// this placeholder is replaced.
// Insert the placeholder...
Function *Func = new Function(cast<FunctionType>(Ty),
GlobalValue::InternalLinkage, "", TheModule);
int DestSlot = insertValue(Func, ModuleValues);
if (DestSlot == -1) throw Error_DestSlot;
ResolveReferencesToValue(Func, (unsigned)DestSlot);
// Keep track of this information in a list that is emptied as functions are
// loaded...
//
FunctionSignatureList.push_back(std::make_pair(Func, DestSlot));
if (read_vbr(Buf, End, FnSignature)) throw Error_readvbr;
BCR_TRACE(2, "Function of type: " << Ty << "\n");
}
ALIGN32(Buf, End);
// Now that the function signature list is set up, reverse it so that we can
// remove elements efficiently from the back of the vector.
std::reverse(FunctionSignatureList.begin(), FunctionSignatureList.end());
// This is for future proofing... in the future extra fields may be added that
// we don't understand, so we transparently ignore them.
//
Buf = End;
}
void BytecodeParser::ParseVersionInfo(const unsigned char *&Buf,
const unsigned char *EndBuf) {
unsigned Version;
if (read_vbr(Buf, EndBuf, Version)) throw Error_readvbr;
// Unpack version number: low four bits are for flags, top bits = version
Module::Endianness Endianness;
Module::PointerSize PointerSize;
Endianness = (Version & 1) ? Module::BigEndian : Module::LittleEndian;
PointerSize = (Version & 2) ? Module::Pointer64 : Module::Pointer32;
bool hasNoEndianness = Version & 4;
bool hasNoPointerSize = Version & 8;
RevisionNum = Version >> 4;
// Default values for the current bytecode version
HasImplicitZeroInitializer = true;
hasInternalMarkerOnly = false;
FirstDerivedTyID = 14;
switch (RevisionNum) {
case 0: // Initial revision
// Version #0 didn't have any of the flags stored correctly, and in fact as
// only valid with a 14 in the flags values. Also, it does not support
// encoding zero initializers for arrays compactly.
//
if (Version != 14) throw std::string("Unknown revision 0 flags?");
HasImplicitZeroInitializer = false;
Endianness = Module::BigEndian;
PointerSize = Module::Pointer64;
hasInternalMarkerOnly = true;
hasNoEndianness = hasNoPointerSize = false;
break;
case 1:
// Version #1 has four bit fields: isBigEndian, hasLongPointers,
// hasNoEndianness, and hasNoPointerSize.
hasInternalMarkerOnly = true;
break;
case 2:
// Version #2 added information about all 4 linkage types instead of just
// having internal and external.
break;
default:
throw std::string("Unknown bytecode version number!");
}
if (hasNoEndianness) Endianness = Module::AnyEndianness;
if (hasNoPointerSize) PointerSize = Module::AnyPointerSize;
TheModule->setEndianness(Endianness);
TheModule->setPointerSize(PointerSize);
BCR_TRACE(1, "Bytecode Rev = " << (unsigned)RevisionNum << "\n");
BCR_TRACE(1, "Endianness/PointerSize = " << Endianness << ","
<< PointerSize << "\n");
BCR_TRACE(1, "HasImplicitZeroInit = " << HasImplicitZeroInitializer << "\n");
}
void BytecodeParser::ParseModule(const unsigned char *Buf,
const unsigned char *EndBuf) {
unsigned Type, Size;
readBlock(Buf, EndBuf, Type, Size);
if (Type != BytecodeFormat::Module || Buf+Size != EndBuf)
throw std::string("Expected Module packet! B: "+
utostr((unsigned)(intptr_t)Buf) + ", S: "+utostr(Size)+
" E: "+utostr((unsigned)(intptr_t)EndBuf)); // Hrm, not a class?
BCR_TRACE(0, "BLOCK BytecodeFormat::Module: {\n");
FunctionSignatureList.clear(); // Just in case...
// Read into instance variables...
ParseVersionInfo(Buf, EndBuf);
ALIGN32(Buf, EndBuf);
while (Buf < EndBuf) {
const unsigned char *OldBuf = Buf;
readBlock(Buf, EndBuf, Type, Size);
switch (Type) {
case BytecodeFormat::GlobalTypePlane:
BCR_TRACE(1, "BLOCK BytecodeFormat::GlobalTypePlane: {\n");
ParseGlobalTypes(Buf, Buf+Size);
break;
case BytecodeFormat::ModuleGlobalInfo:
BCR_TRACE(1, "BLOCK BytecodeFormat::ModuleGlobalInfo: {\n");
ParseModuleGlobalInfo(Buf, Buf+Size);
break;
case BytecodeFormat::ConstantPool:
BCR_TRACE(1, "BLOCK BytecodeFormat::ConstantPool: {\n");
ParseConstantPool(Buf, Buf+Size, ModuleValues, ModuleTypeValues);
break;
case BytecodeFormat::Function: {
BCR_TRACE(1, "BLOCK BytecodeFormat::Function: {\n");
ParseFunction(Buf, Buf+Size);
break;
}
case BytecodeFormat::SymbolTable:
BCR_TRACE(1, "BLOCK BytecodeFormat::SymbolTable: {\n");
ParseSymbolTable(Buf, Buf+Size, &TheModule->getSymbolTable(), 0);
break;
default:
Buf += Size;
if (OldBuf > Buf) throw std::string("Expected Module Block!");
break;
}
BCR_TRACE(1, "} end block\n");
ALIGN32(Buf, EndBuf);
}
// After the module constant pool has been read, we can safely initialize
// global variables...
while (!GlobalInits.empty()) {
GlobalVariable *GV = GlobalInits.back().first;
unsigned Slot = GlobalInits.back().second;
GlobalInits.pop_back();
// Look up the initializer value...
if (Value *V = getValue(GV->getType()->getElementType(), Slot, false)) {
if (GV->hasInitializer())
throw std::string("Global *already* has an initializer?!");
GV->setInitializer(cast<Constant>(V));
} else
throw std::string("Cannot find initializer value.");
}
if (!FunctionSignatureList.empty())
throw std::string("Function expected, but bytecode stream ended!");
BCR_TRACE(0, "} end block\n\n");
}
void
BytecodeParser::ParseBytecode(const unsigned char *Buf, unsigned Length,
const std::string &ModuleID) {
unsigned char *EndBuf = (unsigned char*)(Buf + Length);
// Read and check signature...
unsigned Sig;
if (read(Buf, EndBuf, Sig) ||
Sig != ('l' | ('l' << 8) | ('v' << 16) | ('m' << 24)))
throw std::string("Invalid bytecode signature!");
TheModule = new Module(ModuleID);
try {
ParseModule(Buf, EndBuf);
} catch (std::string &Error) {
freeState(); // Must destroy handles before deleting module!
delete TheModule;
TheModule = 0;
throw;
}
}
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