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d798a515e9
Reader code much easier to read and maintain. Backwards compatibility from version 5 format has been retained. Older formats will produce an error. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31723 91177308-0d34-0410-b5e6-96231b3b80d8
59 lines
2.5 KiB
C++
59 lines
2.5 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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/// The the identifier and the size of the block are encoded into a single
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/// vbr_uint32 with 5 bits for the block identifier and 27-bits for block
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/// 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 BytecodeBlockIdentifiers {
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Reserved_DoNotUse = 0, ///< Zero value is forbidden, do not use.
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ModuleBlockID = 1, ///< Module block that contains other blocks.
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FunctionBlockID = 2, ///< Function block identifier
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ConstantPoolBlockID = 3, ///< Constant pool identifier
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SymbolTableBlockID = 4, ///< Symbol table identifier
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ModuleGlobalInfoBlockID= 5, ///< Module global info identifier
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GlobalTypePlaneBlockID = 6, ///< Global type plan identifier
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InstructionListBlockID = 7, ///< All instructions in a function
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/// Blocks with this id are used to define a function local remapping
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/// table for the function's values. This allows the indices used within
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/// the function to be as small as possible. This often allows the
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/// instructions to be encoded more efficiently because VBR takes fewer
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/// bytes with smaller values.
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/// @brief Value Compaction Table Block
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CompactionTableBlockID = 0x08,
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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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