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Definition of the Bytecode Handler interface. Subclasses can override just
the methods they are interested in to perform out-of-band tasks while the BytecodeReader is constructing a module. Handlers should *not* modify any of the LLVM IR objects during this process. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14380 91177308-0d34-0410-b5e6-96231b3b80d8
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include/llvm/Bytecode/Handler.h
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include/llvm/Bytecode/Handler.h
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//===-- Handler.h - Handle Bytecode Parsing Events --------------*- 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 Reid Spencer and is distributed under the
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// 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 the interface to the Bytecode Handler. The handler
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// is caleld by the Bytecode Reader to obtain out-of-band parsing events for
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// tasks other then LLVM IR construction.
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//
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//===----------------------------------------------------------------------===//
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#ifndef BYTECODE_HANDLER_H
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#define BYTECODE_HANDLER_H
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#include <llvm/Module.h>
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namespace llvm {
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class ArrayType;
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class StructType;
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class PointerType;
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class ConstantArray;
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/// This class provides the interface for handling bytecode events during
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/// reading of bytecode. The methods on this interface are invoked by the
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/// BytecodeReader as it discovers the content of a bytecode stream.
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/// This class provides a a clear separation of concerns between recognizing
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/// the semantic units of a bytecode file (the Reader) and deciding what to do
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/// with them (the Handler).
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/// The BytecodeReader recognizes the content of the bytecode file and
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/// calls the BytecodeHandler methods to let it perform additional tasks. This
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/// arrangement allows Bytecode files to be read and handled for a number of
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/// purposes simply by creating a subclass of BytecodeHandler. None of the
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/// parsing details need to be understood, only the meaning of the calls
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/// made on this interface.
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///
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/// @see BytecodeHandler
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/// @brief Handle Bytecode Parsing Events
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class BytecodeHandler {
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/// @name Constructors And Operators
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/// @{
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public:
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/// @brief Default constructor (empty)
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BytecodeHandler() {}
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/// @brief Virtual destructor (empty)
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virtual ~BytecodeHandler() {}
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private:
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BytecodeHandler(const BytecodeHandler &); // DO NOT IMPLEMENT
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void operator=(const BytecodeHandler &); // DO NOT IMPLEMENT
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/// @}
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/// @name Handler Methods
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/// @{
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public:
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/// This method is called whenever the parser detects an error in the
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/// bytecode formatting. Returning true will cause the parser to keep
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/// going, however this is inadvisable in most cases. Returning false will
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/// cause the parser to throw the message as a std::string.
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/// @brief Handle parsing errors.
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virtual void handleError(const std::string& str );
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/// This method is called at the beginning of a parse before anything is
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/// read in order to give the handler a chance to initialize.
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/// @brief Handle the start of a bytecode parse
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virtual void handleStart();
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/// This method is called at the end of a parse after everything has been
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/// read in order to give the handler a chance to terminate.
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/// @brief Handle the end of a bytecode parse
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virtual void handleFinish();
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/// This method is called at the start of a module to indicate that a
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/// module is being parsed.
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/// @brief Handle the start of a module.
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virtual void handleModuleBegin(const std::string& id);
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/// This method is called at the end of a module to indicate that the module
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/// previously being parsed has concluded.
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/// @brief Handle the end of a module.
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virtual void handleModuleEnd(
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const std::string& moduleId ///< An identifier for the module
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);
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/// This method is called once the version information has been parsed. It
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/// provides the information about the version of the bytecode file being
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/// read.
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/// @brief Handle the bytecode prolog
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virtual void handleVersionInfo(
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unsigned char RevisionNum, ///< Byte code revision number
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Module::Endianness Endianness, ///< Endianness indicator
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Module::PointerSize PointerSize ///< PointerSize indicator
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);
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/// This method is called at the start of a module globals block which
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/// contains the global variables and the function placeholders
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virtual void handleModuleGlobalsBegin();
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/// This method is called when a non-initialized global variable is
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/// recognized. Its type, constness, and linkage type are provided.
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/// @brief Handle a non-initialized global variable
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virtual void handleGlobalVariable(
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const Type* ElemType, ///< The type of the global variable
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bool isConstant, ///< Whether the GV is constant or not
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GlobalValue::LinkageTypes,///< The linkage type of the GV
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unsigned SlotNum, ///< Slot number of GV
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unsigned initSlot ///< Slot number of GV's initializer (0 if none)
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);
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/// This method is called when a new type is recognized. The type is
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/// converted from the bytecode and passed to this method.
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/// @brief Handle a type
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virtual void handleType(
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const Type* Ty ///< The type that was just recognized
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);
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/// This method is called when the function prototype for a function is
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/// encountered in the module globals block.
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virtual void handleFunctionDeclaration(
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Function* Func, ///< The function being declared
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const FunctionType* FuncType ///< The type of the function
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);
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/// This method is called at the end of the module globals block.
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/// @brief Handle end of module globals block.
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virtual void handleModuleGlobalsEnd();
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/// This method is called at the beginning of a compaction table.
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/// @brief Handle start of compaction table.
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virtual void handleCompactionTableBegin();
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/// @brief Handle start of a compaction table plane
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virtual void handleCompactionTablePlane(
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unsigned Ty, ///< The type of the plane (slot number)
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unsigned NumEntries ///< The number of entries in the plane
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);
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/// @brief Handle a type entry in the compaction table
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virtual void handleCompactionTableType(
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unsigned i, ///< Index in the plane of this type
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unsigned TypSlot, ///< Slot number for this type
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const Type* ///< The type referenced by this slot
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);
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/// @brief Handle a value entry in the compaction table
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virtual void handleCompactionTableValue(
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unsigned i, ///< Index in the compaction table's type plane
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unsigned TypSlot, ///< The slot (plane) of the type of this value
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unsigned ValSlot, ///< The global value slot of the value
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const Type* ///< The resolved type of the value.
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);
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/// @brief Handle end of a compaction table
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virtual void handleCompactionTableEnd();
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/// @brief Handle start of a symbol table
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virtual void handleSymbolTableBegin(
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Function* Func, ///< The function to which the ST belongs
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SymbolTable* ST ///< The symbol table being filled
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);
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/// @brief Handle start of a symbol table plane
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virtual void handleSymbolTablePlane(
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unsigned Ty, ///< The slotnum of the type plane
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unsigned NumEntries, ///< Number of entries in the plane
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const Type* Ty ///< The type of this type plane
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);
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/// @brief Handle a named type in the symbol table
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virtual void handleSymbolTableType(
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unsigned i, ///< The index of the type in this plane
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unsigned slot, ///< Slot number of the named type
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const std::string& name ///< Name of the type
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);
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/// @brief Handle a named value in the symbol table
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virtual void handleSymbolTableValue(
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unsigned i, ///< The index of the value in this plane
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unsigned slot, ///< Slot number of the named value
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const std::string& name ///< Name of the value.
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);
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/// @brief Handle the end of a symbol table
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virtual void handleSymbolTableEnd();
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/// @brief Handle the beginning of a function body
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virtual void handleFunctionBegin(
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Function* Func, ///< The function being defined
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unsigned Size ///< The size (in bytes) of the function's bytecode
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);
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/// @brief Handle the end of a function body
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virtual void handleFunctionEnd(
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Function* Func ///< The function whose definition has just finished.
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);
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/// @brief Handle the beginning of a basic block
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virtual void handleBasicBlockBegin(
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unsigned blocknum ///< The block number of the block
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);
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/// This method is called for each instruction that is parsed.
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/// @returns true if the instruction is a block terminating instruction
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/// @brief Handle an instruction
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virtual bool handleInstruction(
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unsigned Opcode, ///< Opcode of the instruction
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const Type* iType, ///< Instruction type
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std::vector<unsigned>& Operands, ///< Vector of slot # operands
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unsigned Length ///< Length of instruction in bc bytes
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);
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/// @brief Handle the end of a basic block
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virtual void handleBasicBlockEnd(
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unsigned blocknum ///< The block number of the block just finished
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);
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/// @brief Handle start of global constants block.
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virtual void handleGlobalConstantsBegin();
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/// @brief Handle a constant expression
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virtual void handleConstantExpression(
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unsigned Opcode, ///< Opcode of primary expression operator
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const Type* Typ, ///< Type of the expression
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std::vector<std::pair<const Type*,unsigned> > ArgVec ///< expression args
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);
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/// @brief Handle a constant array
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virtual void handleConstantArray(
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const ArrayType* AT, ///< Type of the array
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std::vector<unsigned>& ElementSlots ///< Slot nums for array values
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);
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/// @brief Handle a constant structure
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virtual void handleConstantStruct(
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const StructType* ST, ///< Type of the struct
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std::vector<unsigned>& ElementSlots ///< Slot nums for struct values
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);
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/// @brief Handle a constant pointer
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virtual void handleConstantPointer(
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const PointerType* PT, ///< Type of the pointer
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unsigned Slot ///< Slot num of initializer value
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);
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/// @brief Handle a constant strings (array special case)
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virtual void handleConstantString(
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const ConstantArray* CA ///< Type of the string array
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);
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/// @brief Handle a primitive constant value
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virtual void handleConstantValue(
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Constant * c ///< The constant just defined
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);
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/// @brief Handle the end of the global constants
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virtual void handleGlobalConstantsEnd();
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/// @brief Handle an alignment event
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virtual void handleAlignment(
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unsigned numBytes ///< The number of bytes added for alignment
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);
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/// @brief Handle a bytecode block
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virtual void handleBlock(
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unsigned BType, ///< The type of block
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const unsigned char* StartPtr, ///< The start of the block
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unsigned Size ///< The size of the block
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);
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/// @brief Handle a variable bit rate 32 bit unsigned
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virtual void handleVBR32(
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unsigned Size ///< Number of bytes the vbr_uint took up
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);
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/// @brief Handle a variable bit rate 64 bit unsigned
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virtual void handleVBR64(
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unsigned Size ///< Number of byte sthe vbr_uint64 took up
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);
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/// @}
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};
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}
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// vim: sw=2 ai
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#endif
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