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c668b7c3ae
Add class ConstantFwdRefs to resolve forward references to constants and to globals. (Hmm... this class could be renamed I guess.) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2896 91177308-0d34-0410-b5e6-96231b3b80d8
229 lines
7.8 KiB
C++
229 lines
7.8 KiB
C++
//===-- ReaderInternals.h - Definitions internal to the reader ---*- C++ -*--=//
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//
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// This header file defines various stuff that is used by the bytecode reader.
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//
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//===----------------------------------------------------------------------===//
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#ifndef READER_INTERNALS_H
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#define READER_INTERNALS_H
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#include "llvm/Bytecode/Primitives.h"
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#include "llvm/Function.h"
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#include "llvm/BasicBlock.h"
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#include "llvm/Instruction.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Constant.h"
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#include "Support/NonCopyable.h"
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#include <map>
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#include <utility>
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#include <list>
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#include <iostream>
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// Enable to trace to figure out what the heck is going on when parsing fails
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#define TRACE_LEVEL 0
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#if TRACE_LEVEL // ByteCodeReading_TRACEer
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#define BCR_TRACE(n, X) if (n < TRACE_LEVEL) std::cerr << std::string(n*2, ' ') << X
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#else
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#define BCR_TRACE(n, X)
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#endif
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typedef unsigned char uchar;
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struct RawInst { // The raw fields out of the bytecode stream...
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unsigned NumOperands;
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unsigned Opcode;
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const Type *Ty;
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unsigned Arg1, Arg2;
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union {
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unsigned Arg3;
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std::vector<unsigned> *VarArgs; // Contains arg #3,4,5... if NumOperands > 3
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};
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};
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class ConstantFwdRefs: public NonCopyable {
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Module* TheModule;
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// GlobalRefs - This maintains a mapping between <Type, Slot #>'s and forward
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// references to global values or constants. Such values may be referenced
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// before they are defined, and if so, the temporary object that they
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// represent is held here.
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//
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typedef std::map<std::pair<const Type *, unsigned>,
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Value*> GlobalRefsType;
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GlobalRefsType GlobalRefs;
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Value* find (const Type* Ty, unsigned Slot);
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void insert (const Type* Ty, unsigned Slot, Value* V);
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void erase (const Type* Ty, unsigned Slot);
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public:
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// sets the current module pointer: needed to insert placeholder globals
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void VisitingModule (Module* M) { TheModule = M; }
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// get a forward reference to a global or a constant
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GlobalValue* GetFwdRefToGlobal (const PointerType* PT, unsigned Slot);
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Constant* GetFwdRefToConstant (const Type* Ty, unsigned Slot);
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// resolve all references to the placeholder (if any) for the given value
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void ResolveRefsToValue (Value* val, unsigned Slot);
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};
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class BytecodeParser : public AbstractTypeUser {
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std::string Error; // Error message string goes here...
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public:
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BytecodeParser() {
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// Define this in case we don't see a ModuleGlobalInfo block.
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FirstDerivedTyID = Type::FirstDerivedTyID;
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}
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Module *ParseBytecode(const uchar *Buf, const uchar *EndBuf);
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std::string getError() const { return Error; }
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void dump() const {
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std::cerr << "BytecodeParser instance!\n";
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}
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private: // All of this data is transient across calls to ParseBytecode
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Module *TheModule; // Current Module being read into...
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typedef std::vector<Value *> ValueList;
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typedef std::vector<ValueList> ValueTable;
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ValueTable Values, LateResolveValues;
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ValueTable ModuleValues, LateResolveModuleValues;
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// fwdRefs - This manages forward references to global values.
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ConstantFwdRefs fwdRefs;
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// TypesLoaded - This vector mirrors the Values[TypeTyID] plane. It is used
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// to deal with forward references to types.
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//
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typedef std::vector<PATypeHandle<Type> > TypeValuesListTy;
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TypeValuesListTy ModuleTypeValues;
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TypeValuesListTy MethodTypeValues;
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// Information read from the ModuleGlobalInfo section of the file...
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unsigned FirstDerivedTyID;
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// When the ModuleGlobalInfo section is read, we load the type of each method
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// and the 'ModuleValues' slot that it lands in. We then load a placeholder
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// into its slot to reserve it. When the method is loaded, this placeholder
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// is replaced.
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//
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std::list<std::pair<const PointerType *, unsigned> > MethodSignatureList;
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private:
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bool ParseModule (const uchar * Buf, const uchar *End, Module *&);
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bool ParseModuleGlobalInfo(const uchar *&Buf, const uchar *End, Module *);
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bool ParseSymbolTable (const uchar *&Buf, const uchar *End, SymbolTable *);
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bool ParseMethod (const uchar *&Buf, const uchar *End, Module *);
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bool ParseBasicBlock (const uchar *&Buf, const uchar *End, BasicBlock *&);
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bool ParseInstruction (const uchar *&Buf, const uchar *End, Instruction *&);
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bool ParseRawInst (const uchar *&Buf, const uchar *End, RawInst &);
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bool ParseConstantPool(const uchar *&Buf, const uchar *EndBuf,
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ValueTable &Tab, TypeValuesListTy &TypeTab);
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bool parseConstantValue(const uchar *&Buf, const uchar *End,
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const Type *Ty, Constant *&V);
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bool parseTypeConstants(const uchar *&Buf, const uchar *EndBuf,
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TypeValuesListTy &Tab, unsigned NumEntries);
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const Type *parseTypeConstant(const uchar *&Buf, const uchar *EndBuf);
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Value *getValue(const Type *Ty, unsigned num, bool Create = true);
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const Type *getType(unsigned ID);
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int insertValue(Value *D, std::vector<ValueList> &D); // -1 = Failure
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bool postResolveValues(ValueTable &ValTab);
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bool getTypeSlot(const Type *Ty, unsigned &Slot);
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// resolveRefsToGlobal -- resolve forward references to a global
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// resolveRefsToConstant -- resolve forward references to a constant
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//
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void resolveRefsToGlobal(GlobalValue* GV, unsigned Slot);
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void resolveRefsToConstant(Constant* C, unsigned Slot);
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// refineAbstractType - The callback method is invoked when one of the
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// elements of TypeValues becomes more concrete...
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//
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virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
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};
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template<class SuperType>
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class PlaceholderDef : public SuperType {
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unsigned ID;
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PlaceholderDef(); // do not implement
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public:
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PlaceholderDef(const Type *Ty, unsigned id) : SuperType(Ty), ID(id) {}
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unsigned getID() { return ID; }
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};
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struct InstPlaceHolderHelper : public Instruction {
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InstPlaceHolderHelper(const Type *Ty) : Instruction(Ty, UserOp1, "") {}
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virtual const char *getOpcodeName() const { return "placeholder"; }
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virtual Instruction *clone() const { abort(); return 0; }
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};
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struct BBPlaceHolderHelper : public BasicBlock {
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BBPlaceHolderHelper(const Type *Ty) : BasicBlock() {
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assert(Ty == Type::LabelTy);
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}
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};
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struct MethPlaceHolderHelper : public Function {
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MethPlaceHolderHelper(const Type *Ty)
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: Function(cast<const FunctionType>(Ty), true) {
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}
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};
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struct ConstantPlaceHolderHelper : public Constant {
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ConstantPlaceHolderHelper(const Type *Ty)
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: Constant(Ty) {}
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virtual bool isNullValue() const { return false; }
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};
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typedef PlaceholderDef<InstPlaceHolderHelper> DefPHolder;
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typedef PlaceholderDef<BBPlaceHolderHelper> BBPHolder;
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typedef PlaceholderDef<MethPlaceHolderHelper> MethPHolder;
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typedef PlaceholderDef<ConstantPlaceHolderHelper> ConstPHolder;
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static inline unsigned getValueIDNumberFromPlaceHolder(Value *Def) {
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if (isa<Constant>(Def))
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return ((ConstPHolder*)Def)->getID();
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// else discriminate by type
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switch (Def->getType()->getPrimitiveID()) {
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case Type::LabelTyID: return ((BBPHolder*)Def)->getID();
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case Type::FunctionTyID: return ((MethPHolder*)Def)->getID();
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default: return ((DefPHolder*)Def)->getID();
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}
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}
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static inline bool readBlock(const uchar *&Buf, const uchar *EndBuf,
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unsigned &Type, unsigned &Size) {
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#if DEBUG_OUTPUT
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bool Result = read(Buf, EndBuf, Type) || read(Buf, EndBuf, Size);
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std::cerr << "StartLoc = " << ((unsigned)Buf & 4095)
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<< " Type = " << Type << " Size = " << Size << endl;
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return Result;
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#else
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return read(Buf, EndBuf, Type) || read(Buf, EndBuf, Size);
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#endif
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}
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// failure Template - This template function is used as a place to put
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// breakpoints in to debug failures of the bytecode parser.
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//
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template <typename X>
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static X failure(X Value) {
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return Value;
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}
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#endif
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