mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-11-04 05:17:07 +00:00
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++ -*-===//
|
|
//
|
|
// 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:
|
|
/// The 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 BytecodeBlockIdentifiers {
|
|
|
|
Reserved_DoNotUse = 0, ///< Zero value is forbidden, do not use.
|
|
ModuleBlockID = 1, ///< Module block that contains other blocks.
|
|
FunctionBlockID = 2, ///< Function block identifier
|
|
ConstantPoolBlockID = 3, ///< Constant pool identifier
|
|
SymbolTableBlockID = 4, ///< Symbol table identifier
|
|
ModuleGlobalInfoBlockID= 5, ///< Module global info identifier
|
|
GlobalTypePlaneBlockID = 6, ///< Global type plan identifier
|
|
InstructionListBlockID = 7, ///< All instructions in a function
|
|
|
|
/// Blocks with this id are used to define a function local remapping
|
|
/// table for the function's values. This allows the indices used within
|
|
/// the function to be as small as possible. This often allows the
|
|
/// instructions to be encoded more efficiently because VBR takes fewer
|
|
/// bytes with smaller values.
|
|
/// @brief Value Compaction Table Block
|
|
CompactionTableBlockID = 0x08,
|
|
|
|
// Not a block id, just used to count them
|
|
NumberOfBlockIDs
|
|
};
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|