217 lines
7.6 KiB
C++
217 lines
7.6 KiB
C++
//===-- ReaderInternals.h - Definitions internal to the reader ---*- C++ -*--=//
|
|
//
|
|
// This header file defines various stuff that is used by the bytecode reader.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef READER_INTERNALS_H
|
|
#define READER_INTERNALS_H
|
|
|
|
#include "llvm/Constant.h"
|
|
#include "llvm/DerivedTypes.h"
|
|
#include "llvm/Function.h"
|
|
#include "llvm/ModuleProvider.h"
|
|
#include "llvm/Bytecode/Primitives.h"
|
|
#include <utility>
|
|
#include <map>
|
|
|
|
// Enable to trace to figure out what the heck is going on when parsing fails
|
|
//#define TRACE_LEVEL 10
|
|
|
|
#if TRACE_LEVEL // ByteCodeReading_TRACEr
|
|
#define BCR_TRACE(n, X) \
|
|
if (n < TRACE_LEVEL) std::cerr << std::string(n*2, ' ') << X
|
|
#else
|
|
#define BCR_TRACE(n, X)
|
|
#endif
|
|
|
|
struct LazyFunctionInfo {
|
|
const unsigned char *Buf, *EndBuf;
|
|
unsigned FunctionSlot;
|
|
};
|
|
|
|
class BytecodeParser : public ModuleProvider {
|
|
BytecodeParser(const BytecodeParser &); // DO NOT IMPLEMENT
|
|
void operator=(const BytecodeParser &); // DO NOT IMPLEMENT
|
|
public:
|
|
BytecodeParser() {
|
|
// Define this in case we don't see a ModuleGlobalInfo block.
|
|
FirstDerivedTyID = Type::FirstDerivedTyID;
|
|
}
|
|
|
|
~BytecodeParser() {
|
|
freeState();
|
|
}
|
|
void freeState() {
|
|
freeTable(Values);
|
|
freeTable(ModuleValues);
|
|
}
|
|
|
|
Module* releaseModule() {
|
|
// Since we're losing control of this Module, we must hand it back complete
|
|
Module *M = ModuleProvider::releaseModule();
|
|
freeState();
|
|
return M;
|
|
}
|
|
|
|
void ParseBytecode(const unsigned char *Buf, unsigned Length,
|
|
const std::string &ModuleID);
|
|
|
|
void dump() const {
|
|
std::cerr << "BytecodeParser instance!\n";
|
|
}
|
|
|
|
private:
|
|
struct ValueList : public User {
|
|
ValueList() : User(Type::TypeTy, Value::TypeVal) {}
|
|
|
|
// vector compatibility methods
|
|
unsigned size() const { return getNumOperands(); }
|
|
void push_back(Value *V) { Operands.push_back(Use(V, this)); }
|
|
Value *back() const { return Operands.back(); }
|
|
void pop_back() { Operands.pop_back(); }
|
|
bool empty() const { return Operands.empty(); }
|
|
|
|
virtual void print(std::ostream& OS) const {
|
|
OS << "Bytecode Reader UseHandle!";
|
|
}
|
|
};
|
|
|
|
// Information about the module, extracted from the bytecode revision number.
|
|
unsigned char RevisionNum; // The rev # itself
|
|
unsigned char FirstDerivedTyID; // First variable index to use for type
|
|
bool HasImplicitZeroInitializer; // Is entry 0 of every slot implicity zeros?
|
|
bool hasInternalMarkerOnly; // Only types of linkage are intern/external
|
|
|
|
typedef std::vector<ValueList*> ValueTable;
|
|
ValueTable Values;
|
|
ValueTable ModuleValues;
|
|
std::map<std::pair<unsigned,unsigned>, Value*> ForwardReferences;
|
|
|
|
std::vector<BasicBlock*> ParsedBasicBlocks;
|
|
|
|
// GlobalRefs - This maintains a mapping between <Type, Slot #>'s and forward
|
|
// references to global values or constants. Such values may be referenced
|
|
// before they are defined, and if so, the temporary object that they
|
|
// represent is held here.
|
|
//
|
|
typedef std::map<std::pair<const Type *, unsigned>, Value*> GlobalRefsType;
|
|
GlobalRefsType GlobalRefs;
|
|
|
|
// TypesLoaded - This vector mirrors the Values[TypeTyID] plane. It is used
|
|
// to deal with forward references to types.
|
|
//
|
|
typedef std::vector<PATypeHolder> TypeValuesListTy;
|
|
TypeValuesListTy ModuleTypeValues;
|
|
TypeValuesListTy FunctionTypeValues;
|
|
|
|
// When the ModuleGlobalInfo section is read, we create a function object for
|
|
// each function in the module. When the function is loaded, this function is
|
|
// filled in.
|
|
//
|
|
std::vector<std::pair<Function*, unsigned> > FunctionSignatureList;
|
|
|
|
// Constant values are read in after global variables. Because of this, we
|
|
// must defer setting the initializers on global variables until after module
|
|
// level constants have been read. In the mean time, this list keeps track of
|
|
// what we must do.
|
|
//
|
|
std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInits;
|
|
|
|
// For lazy reading-in of functions, we need to save away several pieces of
|
|
// information about each function: its begin and end pointer in the buffer
|
|
// and its FunctionSlot.
|
|
//
|
|
std::map<Function*, LazyFunctionInfo*> LazyFunctionLoadMap;
|
|
|
|
private:
|
|
void freeTable(ValueTable &Tab) {
|
|
while (!Tab.empty()) {
|
|
delete Tab.back();
|
|
Tab.pop_back();
|
|
}
|
|
}
|
|
|
|
public:
|
|
void ParseModule(const unsigned char * Buf, const unsigned char *End);
|
|
void materializeFunction(Function *F);
|
|
|
|
private:
|
|
void ParseVersionInfo (const unsigned char *&Buf, const unsigned char *End);
|
|
void ParseModuleGlobalInfo(const unsigned char *&Buf, const unsigned char *E);
|
|
void ParseSymbolTable(const unsigned char *&Buf, const unsigned char *End,
|
|
SymbolTable *, Function *CurrentFunction);
|
|
void ParseFunction(const unsigned char *&Buf, const unsigned char *End);
|
|
void ParseGlobalTypes(const unsigned char *&Buf, const unsigned char *EndBuf);
|
|
|
|
BasicBlock *ParseBasicBlock(const unsigned char *&Buf,
|
|
const unsigned char *End,
|
|
unsigned BlockNo);
|
|
|
|
Instruction *ParseInstruction(const unsigned char *&Buf,
|
|
const unsigned char *End);
|
|
|
|
void ParseConstantPool(const unsigned char *&Buf, const unsigned char *EndBuf,
|
|
ValueTable &Tab, TypeValuesListTy &TypeTab);
|
|
Constant *parseConstantValue(const unsigned char *&Buf,
|
|
const unsigned char *End,
|
|
const Type *Ty);
|
|
void parseTypeConstants(const unsigned char *&Buf,
|
|
const unsigned char *EndBuf,
|
|
TypeValuesListTy &Tab, unsigned NumEntries);
|
|
const Type *parseTypeConstant(const unsigned char *&Buf,
|
|
const unsigned char *EndBuf);
|
|
|
|
Value *getValue(const Type *Ty, unsigned num, bool Create = true);
|
|
Value *getValue(unsigned TypeID, unsigned num, bool Create = true);
|
|
const Type *getType(unsigned ID);
|
|
BasicBlock *getBasicBlock(unsigned ID);
|
|
Constant *getConstantValue(const Type *Ty, unsigned num);
|
|
|
|
unsigned insertValue(Value *V, ValueTable &Table);
|
|
|
|
unsigned getTypeSlot(const Type *Ty);
|
|
|
|
// resolve all references to the placeholder (if any) for the given value
|
|
void ResolveReferencesToValue(Value *Val, unsigned Slot);
|
|
};
|
|
|
|
template<class SuperType>
|
|
class PlaceholderDef : public SuperType {
|
|
unsigned ID;
|
|
PlaceholderDef(); // DO NOT IMPLEMENT
|
|
void operator=(const PlaceholderDef &); // DO NOT IMPLEMENT
|
|
public:
|
|
PlaceholderDef(const Type *Ty, unsigned id) : SuperType(Ty), ID(id) {}
|
|
unsigned getID() { return ID; }
|
|
};
|
|
|
|
struct ConstantPlaceHolderHelper : public Constant {
|
|
ConstantPlaceHolderHelper(const Type *Ty)
|
|
: Constant(Ty) {}
|
|
virtual bool isNullValue() const { return false; }
|
|
};
|
|
|
|
typedef PlaceholderDef<ConstantPlaceHolderHelper> ConstPHolder;
|
|
|
|
// Some common errors we find
|
|
static const std::string Error_readvbr = "read_vbr(): error reading.";
|
|
static const std::string Error_read = "read(): error reading.";
|
|
static const std::string Error_inputdata = "input_data(): error reading.";
|
|
static const std::string Error_DestSlot = "No destination slot found.";
|
|
|
|
static inline void readBlock(const unsigned char *&Buf,
|
|
const unsigned char *EndBuf,
|
|
unsigned &Type, unsigned &Size) {
|
|
#if DEBUG_OUTPUT
|
|
bool Result = read(Buf, EndBuf, Type) || read(Buf, EndBuf, Size);
|
|
std::cerr << "StartLoc = " << ((unsigned)Buf & 4095)
|
|
<< " Type = " << Type << " Size = " << Size << endl;
|
|
if (Result) throw Error_read;
|
|
#else
|
|
if (read(Buf, EndBuf, Type) || read(Buf, EndBuf, Size)) throw Error_read;
|
|
#endif
|
|
}
|
|
|
|
#endif
|