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inside DEBUG_OUTPUT so that it compiles. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9614 91177308-0d34-0410-b5e6-96231b3b80d8
230 lines
8.3 KiB
C++
230 lines
8.3 KiB
C++
//===-- ReaderInternals.h - Definitions internal to the reader --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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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/Constant.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/ModuleProvider.h"
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#include "llvm/Bytecode/Primitives.h"
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#include <utility>
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#include <map>
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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 10
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//#define DEBUG_OUTPUT
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#if TRACE_LEVEL // ByteCodeReading_TRACEr
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#define BCR_TRACE(n, X) \
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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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struct LazyFunctionInfo {
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const unsigned char *Buf, *EndBuf;
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unsigned FunctionSlot;
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};
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class BytecodeParser : public ModuleProvider {
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BytecodeParser(const BytecodeParser &); // DO NOT IMPLEMENT
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void operator=(const BytecodeParser &); // DO NOT IMPLEMENT
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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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~BytecodeParser() {
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freeState();
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}
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void freeState() {
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freeTable(Values);
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freeTable(ModuleValues);
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}
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Module* releaseModule() {
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// Since we're losing control of this Module, we must hand it back complete
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Module *M = ModuleProvider::releaseModule();
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freeState();
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return M;
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}
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void ParseBytecode(const unsigned char *Buf, unsigned Length,
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const std::string &ModuleID);
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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:
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struct ValueList : public User {
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ValueList() : User(Type::TypeTy, Value::TypeVal) {}
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// vector compatibility methods
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unsigned size() const { return getNumOperands(); }
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void push_back(Value *V) { Operands.push_back(Use(V, this)); }
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Value *back() const { return Operands.back(); }
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void pop_back() { Operands.pop_back(); }
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bool empty() const { return Operands.empty(); }
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virtual void print(std::ostream& OS) const {
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OS << "Bytecode Reader UseHandle!";
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}
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};
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// Information about the module, extracted from the bytecode revision number.
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unsigned char RevisionNum; // The rev # itself
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unsigned char FirstDerivedTyID; // First variable index to use for type
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bool hasInternalMarkerOnly; // Only types of linkage are intern/external
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bool hasExtendedLinkageSpecs; // Supports more than 4 linkage types
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bool hasOldStyleVarargs; // Has old version of varargs intrinsics?
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bool hasVarArgCallPadding; // Bytecode has extra padding in vararg call
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bool usesOldStyleVarargs; // Does this module USE old style varargs?
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typedef std::vector<ValueList*> ValueTable;
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ValueTable Values;
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ValueTable ModuleValues;
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std::map<std::pair<unsigned,unsigned>, Value*> ForwardReferences;
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std::vector<BasicBlock*> ParsedBasicBlocks;
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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>, Value*> GlobalRefsType;
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GlobalRefsType GlobalRefs;
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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<PATypeHolder> TypeValuesListTy;
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TypeValuesListTy ModuleTypeValues;
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TypeValuesListTy FunctionTypeValues;
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// When the ModuleGlobalInfo section is read, we create a function object for
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// each function in the module. When the function is loaded, this function is
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// filled in.
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//
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std::vector<std::pair<Function*, unsigned> > FunctionSignatureList;
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// Constant values are read in after global variables. Because of this, we
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// must defer setting the initializers on global variables until after module
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// level constants have been read. In the mean time, this list keeps track of
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// what we must do.
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//
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std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInits;
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// For lazy reading-in of functions, we need to save away several pieces of
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// information about each function: its begin and end pointer in the buffer
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// and its FunctionSlot.
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//
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std::map<Function*, LazyFunctionInfo*> LazyFunctionLoadMap;
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private:
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void freeTable(ValueTable &Tab) {
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while (!Tab.empty()) {
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delete Tab.back();
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Tab.pop_back();
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}
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}
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public:
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void ParseModule(const unsigned char * Buf, const unsigned char *End);
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void materializeFunction(Function *F);
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private:
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void ParseVersionInfo (const unsigned char *&Buf, const unsigned char *End);
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void ParseModuleGlobalInfo(const unsigned char *&Buf, const unsigned char *E);
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void ParseSymbolTable(const unsigned char *&Buf, const unsigned char *End,
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SymbolTable *, Function *CurrentFunction);
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void ParseFunction(const unsigned char *&Buf, const unsigned char *End);
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void ParseGlobalTypes(const unsigned char *&Buf, const unsigned char *EndBuf);
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BasicBlock *ParseBasicBlock(const unsigned char *&Buf,
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const unsigned char *End,
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unsigned BlockNo);
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void ParseInstruction(const unsigned char *&Buf, const unsigned char *End,
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std::vector<unsigned> &Args, BasicBlock *BB);
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void ParseConstantPool(const unsigned char *&Buf, const unsigned char *EndBuf,
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ValueTable &Tab, TypeValuesListTy &TypeTab);
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Constant *parseConstantValue(const unsigned char *&Buf,
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const unsigned char *End,
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const Type *Ty);
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void parseTypeConstants(const unsigned char *&Buf,
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const unsigned char *EndBuf,
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TypeValuesListTy &Tab, unsigned NumEntries);
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const Type *parseTypeConstant(const unsigned char *&Buf,
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const unsigned char *EndBuf);
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Value *getValue(const Type *Ty, unsigned num, bool Create = true);
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Value *getValue(unsigned TypeID, unsigned num, bool Create = true);
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const Type *getType(unsigned ID);
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BasicBlock *getBasicBlock(unsigned ID);
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Constant *getConstantValue(const Type *Ty, unsigned num);
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unsigned insertValue(Value *V, ValueTable &Table);
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unsigned insertValue(Value *V, unsigned Type, ValueTable &Table);
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unsigned getTypeSlot(const Type *Ty);
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// resolve all references to the placeholder (if any) for the given value
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void ResolveReferencesToValue(Value *Val, unsigned Slot);
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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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void operator=(const 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 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<ConstantPlaceHolderHelper> ConstPHolder;
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// Some common errors we find
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static const std::string Error_readvbr = "read_vbr(): error reading.";
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static const std::string Error_read = "read(): error reading.";
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static const std::string Error_inputdata = "input_data(): error reading.";
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static const std::string Error_DestSlot = "No destination slot found.";
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static inline void readBlock(const unsigned char *&Buf,
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const unsigned char *EndBuf,
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unsigned &Type, unsigned &Size) {
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#ifdef 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 << std::endl;
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if (Result) throw Error_read;
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#else
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if (read(Buf, EndBuf, Type) || read(Buf, EndBuf, Size)) throw Error_read;
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#endif
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}
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#endif
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