llvm-6502/include/llvm/Bytecode/BytecodeHandler.h

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//===-- BytecodeHandler.h - Handle Bytecode Parsing Events ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Reid Spencer and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This header file defines the interface to the Bytecode Handler. The handler
// is called by the Bytecode Reader to obtain out-of-band parsing events for
// tasks other then LLVM IR construction.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_BYTECODE_BYTECODEHANDLER_H
#define LLVM_BYTECODE_BYTECODEHANDLER_H
#include "llvm/Module.h"
namespace llvm {
class ArrayType;
class StructType;
class PointerType;
class PackedType;
class ConstantArray;
class Module;
/// This class provides the interface for handling bytecode events during
/// reading of bytecode. The methods on this interface are invoked by the
/// BytecodeReader as it discovers the content of a bytecode stream.
/// This class provides a a clear separation of concerns between recognizing
/// the semantic units of a bytecode file (the Reader) and deciding what to do
/// with them (the Handler).
///
/// The BytecodeReader recognizes the content of the bytecode file and
/// calls the BytecodeHandler methods to let it perform additional tasks. This
/// arrangement allows Bytecode files to be read and handled for a number of
/// purposes simply by creating a subclass of BytecodeHandler. None of the
/// parsing details need to be understood, only the meaning of the calls
/// made on this interface.
///
/// @see BytecodeHandler
/// @brief Handle Bytecode Parsing Events
class BytecodeHandler {
/// @name Constructors And Operators
/// @{
public:
/// @brief Default constructor (empty)
BytecodeHandler() {}
/// @brief Virtual destructor (empty)
virtual ~BytecodeHandler();
private:
BytecodeHandler(const BytecodeHandler &); // DO NOT IMPLEMENT
void operator=(const BytecodeHandler &); // DO NOT IMPLEMENT
/// @}
/// @name Handler Methods
/// @{
public:
/// This method is called whenever the parser detects an error in the
/// bytecode formatting. It gives the handler a chance to do something
/// with the error message before the parser throws an exception to
/// terminate the parsing.
/// @brief Handle parsing errors.
virtual void handleError(const std::string& str ) {}
/// This method is called at the beginning of a parse before anything is
/// read in order to give the handler a chance to initialize.
/// @brief Handle the start of a bytecode parse
virtual void handleStart( Module* Mod, unsigned byteSize ) {}
/// This method is called at the end of a parse after everything has been
/// read in order to give the handler a chance to terminate.
/// @brief Handle the end of a bytecode parse
virtual void handleFinish() {}
/// This method is called at the start of a module to indicate that a
/// module is being parsed.
/// @brief Handle the start of a module.
virtual void handleModuleBegin(const std::string& moduleId) {}
/// This method is called at the end of a module to indicate that the module
/// previously being parsed has concluded.
/// @brief Handle the end of a module.
virtual void handleModuleEnd(
const std::string& moduleId ///< An identifier for the module
) {}
/// This method is called once the version information has been parsed. It
/// provides the information about the version of the bytecode file being
/// read.
/// @brief Handle the bytecode prolog
virtual void handleVersionInfo(
unsigned char RevisionNum ///< Byte code revision number
) {}
/// This method is called at the start of a module globals block which
/// contains the global variables and the function placeholders
virtual void handleModuleGlobalsBegin() {}
/// This method is called when a non-initialized global variable is
/// recognized. Its type, constness, and linkage type are provided.
/// @brief Handle a non-initialized global variable
virtual void handleGlobalVariable(
const Type* ElemType, ///< The type of the global variable
bool isConstant, ///< Whether the GV is constant or not
GlobalValue::LinkageTypes,///< The linkage type of the GV
GlobalValue::VisibilityTypes,///< The visibility style of the GV
unsigned SlotNum, ///< Slot number of GV
unsigned initSlot ///< Slot number of GV's initializer (0 if none)
) {}
/// This method is called when a type list is recognized. It simply
/// provides the number of types that the list contains. The handler
/// should expect that number of calls to handleType.
/// @brief Handle a type
virtual void handleTypeList(
unsigned numEntries ///< The number of entries in the type list
) {}
/// This method is called when a new type is recognized. The type is
/// converted from the bytecode and passed to this method.
/// @brief Handle a type
virtual void handleType(
const Type* Ty ///< The type that was just recognized
) {}
/// This method is called when the function prototype for a function is
/// encountered in the module globals block.
virtual void handleFunctionDeclaration(
Function* Func ///< The function being declared
) {}
/// This method is called when a global variable is initialized with
/// its constant value. Because of forward referencing, etc. this is
/// done towards the end of the module globals block
virtual void handleGlobalInitializer(GlobalVariable*, Constant* ) {}
/// This method is called for each dependent library name found
/// in the module globals block.
virtual void handleDependentLibrary(const std::string& libName) {}
/// This method is called if the module globals has a non-empty target
/// triple
virtual void handleTargetTriple(const std::string& triple) {}
/// This method is called at the end of the module globals block.
/// @brief Handle end of module globals block.
virtual void handleModuleGlobalsEnd() {}
/// @brief Handle start of a symbol table
virtual void handleTypeSymbolTableBegin(
TypeSymbolTable* ST ///< The symbol table being filled
) {}
/// @brief Handle start of a symbol table
virtual void handleValueSymbolTableBegin(
Function* Func, ///< The function to which the ST belongs or 0 for Mod
ValueSymbolTable* ST ///< The symbol table being filled
) {}
/// @brief Handle a named type in the symbol table
virtual void handleSymbolTableType(
unsigned i, ///< The index of the type in this plane
unsigned slot, ///< Slot number of the named type
const std::string& name ///< Name of the type
) {}
/// @brief Handle a named value in the symbol table
virtual void handleSymbolTableValue(
unsigned i, ///< The index of the value in this plane
unsigned slot, ///< Slot number of the named value
const char *name, unsigned NameLen ///< Name of the value.
) {}
/// @brief Handle the end of a value symbol table
virtual void handleTypeSymbolTableEnd() {}
/// @brief Handle the end of a type symbol table
virtual void handleValueSymbolTableEnd() {}
/// @brief Handle the beginning of a function body
virtual void handleFunctionBegin(
Function* Func, ///< The function being defined
unsigned Size ///< The size (in bytes) of the function's bytecode
) {}
/// @brief Handle the end of a function body
virtual void handleFunctionEnd(
Function* Func ///< The function whose definition has just finished.
) {}
/// @brief Handle the beginning of a basic block
virtual void handleBasicBlockBegin(
unsigned blocknum ///< The block number of the block
) {}
/// This method is called for each instruction that is parsed.
/// @returns true if the instruction is a block terminating instruction
/// @brief Handle an instruction
virtual bool handleInstruction(
unsigned Opcode, ///< Opcode of the instruction
const Type* iType, ///< Instruction type
unsigned *Operands, unsigned NumOps, ///< Vector of slot # operands
Instruction *Inst, ///< The resulting instruction
unsigned Length ///< Length of instruction in bc bytes
) { return false; }
/// @brief Handle the end of a basic block
virtual void handleBasicBlockEnd(
unsigned blocknum ///< The block number of the block just finished
) {}
/// @brief Handle start of global constants block.
virtual void handleGlobalConstantsBegin() {}
/// @brief Handle a constant expression
virtual void handleConstantExpression(
unsigned Opcode, ///< Opcode of primary expression operator
Constant**Args, unsigned NumArgs, ///< expression args
Constant* C ///< The constant value
) {}
/// @brief Handle a constant array
virtual void handleConstantArray(
const ArrayType* AT, ///< Type of the array
Constant**ElementSlots, unsigned NumElts,///< Slot nums for array values
unsigned TypeSlot, ///< Slot # of type
Constant* Val ///< The constant value
) {}
/// @brief Handle a constant structure
virtual void handleConstantStruct(
const StructType* ST, ///< Type of the struct
Constant**ElementSlots, unsigned NumElts,///< Slot nums for struct values
Constant* Val ///< The constant value
) {}
/// @brief Handle a constant packed
virtual void handleConstantPacked(
const PackedType* PT, ///< Type of the array
Constant**ElementSlots, unsigned NumElts,///< Slot nums for packed values
unsigned TypeSlot, ///< Slot # of type
Constant* Val ///< The constant value
) {}
/// @brief Handle a constant pointer
virtual void handleConstantPointer(
const PointerType* PT, ///< Type of the pointer
unsigned Slot, ///< Slot num of initializer value
GlobalValue* GV ///< Referenced global value
) {}
/// @brief Handle a constant strings (array special case)
virtual void handleConstantString(
const ConstantArray* CA ///< Type of the string array
) {}
/// @brief Handle a primitive constant value
virtual void handleConstantValue(
Constant * c ///< The constant just defined
) {}
/// @brief Handle the end of the global constants
virtual void handleGlobalConstantsEnd() {}
/// @brief Handle an alignment event
virtual void handleAlignment(
unsigned numBytes ///< The number of bytes added for alignment
) {}
/// @brief Handle a bytecode block
virtual void handleBlock(
unsigned BType, ///< The type of block
const unsigned char* StartPtr, ///< The start of the block
unsigned Size ///< The size of the block
) {}
/// @}
};
}
#endif