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//===-- llvm/Bytecode/Format.h - VM bytecode file format info ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This header defines intrinsic constants that are useful to libraries that
// need to hack on bytecode files directly, like the reader and writer.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_BYTECODE_FORMAT_H
#define LLVM_BYTECODE_FORMAT_H
namespace llvm {
class BytecodeFormat { // Throw the constants into a poorman's namespace...
BytecodeFormat(); // do not implement
public:
// ID Numbers that are used in bytecode files...
enum FileBlockIDs {
// File level identifiers...
Module = 0x01,
// Module subtypes:
Function = 0x11,
ConstantPool,
SymbolTable,
ModuleGlobalInfo,
GlobalTypePlane,
DependentLibs,
// Function subtypes:
// Can also have ConstantPool block
// Can also have SymbolTable block
BasicBlock = 0x31,// May contain many basic blocks (obsolete since LLVM 1.1)
// InstructionList - The instructions in the body of a function. This
// superceeds the old BasicBlock node used in LLVM 1.0.
InstructionList = 0x32,
// CompactionTable - blocks with this id are used to define local remapping
// tables for a function, allowing the indices used within the function to
// be as small as possible. This often allows the instructions to be
// encoded more efficiently.
CompactionTable = 0x33,
};
/// In LLVM 1.3 format, the identifier and the size of the block are
/// encoded into a single vbr_uint32 with 5 bits for the block identifier
/// and 27-bits for block length. This limits blocks to a maximum of
/// 128MBytes of data, and block types to 31 which should be sufficient
/// for the foreseeable usage. Because the values of block identifiers MUST
/// fit within 5 bits (values 1-31), this enumeration is used to ensure
/// smaller values are used for 1.3 and subsequent bytecode versions.
/// @brief The block number identifiers used in LLVM 1.3 bytecode
/// format.
enum CompressedBytecodeBlockIdentifiers {
// Zero value ist verbotten!
Reserved_DoNotUse = 0x00, ///< Don't use this!
// This is the uber block that contains the rest of the blocks.
ModuleBlockID = 0x01, ///< 1.3 identifier for modules
// Module subtypes:
// This is the identifier for a function
FunctionBlockID = 0x02, ///< 1.3 identifier for Functions
ConstantPoolBlockID = 0x03, ///< 1.3 identifier for constant pool
SymbolTableBlockID = 0x04, ///< 1.3 identifier for symbol table
ModuleGlobalInfoBlockID = 0x05,///< 1.3 identifier for module globals
GlobalTypePlaneBlockID = 0x06, ///< 1.3 identifier for global types
// Function subtypes:
// InstructionList - The instructions in the body of a function. This
// superceeds the old BasicBlock node used in LLVM 1.0.
InstructionListBlockID = 0x07, ///< 1.3 identifier for insruction list
// CompactionTable - blocks with this id are used to define local remapping
// tables for a function, allowing the indices used within the function to
// be as small as possible. This often allows the instructions to be
// encoded more efficiently.
CompactionTableBlockID = 0x08, ///< 1.3 identifier for compaction tables
// Not a block id, just used to count them
NumberOfBlockIDs
};
};
} // End llvm namespace
#endif
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