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