1 //===-- ReaderInternals.h - Definitions internal to the reader ---*- C++ -*--=//
3 // This header file defines various stuff that is used by the bytecode reader.
5 //===----------------------------------------------------------------------===//
7 #ifndef READER_INTERNALS_H
8 #define READER_INTERNALS_H
10 #include "llvm/Bytecode/Primitives.h"
11 #include "llvm/DerivedTypes.h"
12 #include "llvm/Function.h"
13 #include "llvm/Constant.h"
17 // Enable to trace to figure out what the heck is going on when parsing fails
20 #if TRACE_LEVEL // ByteCodeReading_TRACEer
21 #define BCR_TRACE(n, X) \
22 if (n < TRACE_LEVEL) std::cerr << std::string(n*2, ' ') << X
24 #define BCR_TRACE(n, X)
27 typedef unsigned char uchar;
29 struct RawInst { // The raw fields out of the bytecode stream...
36 std::vector<unsigned> *VarArgs; // Contains arg #3,4,5... if NumOperands > 3
40 class BytecodeParser : public AbstractTypeUser {
41 std::string Error; // Error message string goes here...
42 BytecodeParser(const BytecodeParser &); // DO NOT IMPLEMENT
43 void operator=(const BytecodeParser &); // DO NOT IMPLEMENT
46 // Define this in case we don't see a ModuleGlobalInfo block.
47 FirstDerivedTyID = Type::FirstDerivedTyID;
51 freeTable(LateResolveValues);
52 freeTable(ModuleValues);
55 Module *ParseBytecode(const uchar *Buf, const uchar *EndBuf,
56 const std::string &ModuleID);
58 std::string getError() const { return Error; }
61 std::cerr << "BytecodeParser instance!\n";
64 private: // All of this data is transient across calls to ParseBytecode
65 struct ValueList : public User {
66 ValueList() : User(Type::TypeTy, Value::TypeVal) {
70 // vector compatibility methods
71 unsigned size() const { return getNumOperands(); }
72 void push_back(Value *V) { Operands.push_back(Use(V, this)); }
73 Value *back() const { return Operands.back(); }
74 void pop_back() { Operands.pop_back(); }
75 bool empty() const { return Operands.empty(); }
77 virtual void print(std::ostream& OS) const {
78 OS << "Bytecode Reader UseHandle!";
82 Module *TheModule; // Current Module being read into...
84 // Information about the module, extracted from the bytecode revision number.
85 unsigned char RevisionNum; // The rev # itself
86 unsigned char FirstDerivedTyID; // First variable index to use for type
87 bool HasImplicitZeroInitializer; // Is entry 0 of every slot implicity zeros?
88 bool isBigEndian, hasLongPointers;// Information about the target compiled for
89 bool hasInternalMarkerOnly; // Only types of linkage are intern/external
91 typedef std::vector<ValueList*> ValueTable;
92 ValueTable Values, LateResolveValues;
93 ValueTable ModuleValues;
95 // GlobalRefs - This maintains a mapping between <Type, Slot #>'s and forward
96 // references to global values or constants. Such values may be referenced
97 // before they are defined, and if so, the temporary object that they
98 // represent is held here.
100 typedef std::map<std::pair<const Type *, unsigned>, Value*> GlobalRefsType;
101 GlobalRefsType GlobalRefs;
103 // TypesLoaded - This vector mirrors the Values[TypeTyID] plane. It is used
104 // to deal with forward references to types.
106 typedef std::vector<PATypeHandle<Type> > TypeValuesListTy;
107 TypeValuesListTy ModuleTypeValues;
108 TypeValuesListTy FunctionTypeValues;
110 // When the ModuleGlobalInfo section is read, we create a function object for
111 // each function in the module. When the function is loaded, this function is
114 std::vector<std::pair<Function*, unsigned> > FunctionSignatureList;
116 // Constant values are read in after global variables. Because of this, we
117 // must defer setting the initializers on global variables until after module
118 // level constants have been read. In the mean time, this list keeps track of
121 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInits;
124 void freeTable(ValueTable &Tab) {
125 while (!Tab.empty()) {
131 bool ParseModule (const uchar * Buf, const uchar *End);
132 bool ParseVersionInfo (const uchar *&Buf, const uchar *End);
133 bool ParseModuleGlobalInfo(const uchar *&Buf, const uchar *End);
134 bool ParseSymbolTable (const uchar *&Buf, const uchar *End, SymbolTable *);
135 bool ParseFunction (const uchar *&Buf, const uchar *End);
136 bool ParseBasicBlock (const uchar *&Buf, const uchar *End, BasicBlock *&);
137 bool ParseInstruction (const uchar *&Buf, const uchar *End, Instruction *&,
138 BasicBlock *BB /*HACK*/);
139 bool ParseRawInst (const uchar *&Buf, const uchar *End, RawInst &);
141 bool ParseGlobalTypes(const uchar *&Buf, const uchar *EndBuf);
142 bool ParseConstantPool(const uchar *&Buf, const uchar *EndBuf,
143 ValueTable &Tab, TypeValuesListTy &TypeTab);
144 bool parseConstantValue(const uchar *&Buf, const uchar *End,
145 const Type *Ty, Constant *&V);
146 bool parseTypeConstants(const uchar *&Buf, const uchar *EndBuf,
147 TypeValuesListTy &Tab, unsigned NumEntries);
148 const Type *parseTypeConstant(const uchar *&Buf, const uchar *EndBuf);
150 Value *getValue(const Type *Ty, unsigned num, bool Create = true);
151 const Type *getType(unsigned ID);
152 Constant *getConstantValue(const Type *Ty, unsigned num);
154 int insertValue(Value *V, ValueTable &Table); // -1 = Failure
155 void setValueTo(ValueTable &D, unsigned Slot, Value *V);
156 bool postResolveValues(ValueTable &ValTab);
158 bool getTypeSlot(const Type *Ty, unsigned &Slot);
160 // resolve all references to the placeholder (if any) for the given value
161 void ResolveReferencesToValue(Value *Val, unsigned Slot);
164 // refineAbstractType - The callback method is invoked when one of the
165 // elements of TypeValues becomes more concrete...
167 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
170 template<class SuperType>
171 class PlaceholderDef : public SuperType {
173 PlaceholderDef(); // DO NOT IMPLEMENT
174 void operator=(const PlaceholderDef &); // DO NOT IMPLEMENT
176 PlaceholderDef(const Type *Ty, unsigned id) : SuperType(Ty), ID(id) {}
177 unsigned getID() { return ID; }
180 struct InstPlaceHolderHelper : public Instruction {
181 InstPlaceHolderHelper(const Type *Ty) : Instruction(Ty, UserOp1, "") {}
182 virtual const char *getOpcodeName() const { return "placeholder"; }
184 virtual Instruction *clone() const { abort(); return 0; }
187 struct BBPlaceHolderHelper : public BasicBlock {
188 BBPlaceHolderHelper(const Type *Ty) : BasicBlock() {
189 assert(Ty == Type::LabelTy);
193 struct ConstantPlaceHolderHelper : public Constant {
194 ConstantPlaceHolderHelper(const Type *Ty)
196 virtual bool isNullValue() const { return false; }
199 typedef PlaceholderDef<InstPlaceHolderHelper> ValPHolder;
200 typedef PlaceholderDef<BBPlaceHolderHelper> BBPHolder;
201 typedef PlaceholderDef<ConstantPlaceHolderHelper> ConstPHolder;
204 static inline unsigned getValueIDNumberFromPlaceHolder(Value *Val) {
205 if (isa<Constant>(Val))
206 return ((ConstPHolder*)Val)->getID();
208 // else discriminate by type
209 switch (Val->getType()->getPrimitiveID()) {
210 case Type::LabelTyID: return ((BBPHolder*)Val)->getID();
211 default: return ((ValPHolder*)Val)->getID();
215 static inline bool readBlock(const uchar *&Buf, const uchar *EndBuf,
216 unsigned &Type, unsigned &Size) {
218 bool Result = read(Buf, EndBuf, Type) || read(Buf, EndBuf, Size);
219 std::cerr << "StartLoc = " << ((unsigned)Buf & 4095)
220 << " Type = " << Type << " Size = " << Size << endl;
223 return read(Buf, EndBuf, Type) || read(Buf, EndBuf, Size);