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https://github.com/c64scene-ar/llvm-6502.git
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1f6efa3996
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120298 91177308-0d34-0410-b5e6-96231b3b80d8
186 lines
6.3 KiB
C++
186 lines
6.3 KiB
C++
//===- BitCodes.h - Enum values for the bitcode format ----------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This header Bitcode enum values.
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//
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// The enum values defined in this file should be considered permanent. If
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// new features are added, they should have values added at the end of the
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// respective lists.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_BITCODE_BITCODES_H
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#define LLVM_BITCODE_BITCODES_H
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/DataTypes.h"
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#include <cassert>
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namespace llvm {
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namespace bitc {
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enum StandardWidths {
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BlockIDWidth = 8, // We use VBR-8 for block IDs.
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CodeLenWidth = 4, // Codelen are VBR-4.
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BlockSizeWidth = 32 // BlockSize up to 2^32 32-bit words = 16GB per block.
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};
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// The standard abbrev namespace always has a way to exit a block, enter a
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// nested block, define abbrevs, and define an unabbreviated record.
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enum FixedAbbrevIDs {
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END_BLOCK = 0, // Must be zero to guarantee termination for broken bitcode.
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ENTER_SUBBLOCK = 1,
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/// DEFINE_ABBREV - Defines an abbrev for the current block. It consists
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/// of a vbr5 for # operand infos. Each operand info is emitted with a
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/// single bit to indicate if it is a literal encoding. If so, the value is
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/// emitted with a vbr8. If not, the encoding is emitted as 3 bits followed
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/// by the info value as a vbr5 if needed.
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DEFINE_ABBREV = 2,
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// UNABBREV_RECORDs are emitted with a vbr6 for the record code, followed by
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// a vbr6 for the # operands, followed by vbr6's for each operand.
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UNABBREV_RECORD = 3,
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// This is not a code, this is a marker for the first abbrev assignment.
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FIRST_APPLICATION_ABBREV = 4
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};
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/// StandardBlockIDs - All bitcode files can optionally include a BLOCKINFO
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/// block, which contains metadata about other blocks in the file.
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enum StandardBlockIDs {
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/// BLOCKINFO_BLOCK is used to define metadata about blocks, for example,
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/// standard abbrevs that should be available to all blocks of a specified
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/// ID.
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BLOCKINFO_BLOCK_ID = 0,
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// Block IDs 1-7 are reserved for future expansion.
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FIRST_APPLICATION_BLOCKID = 8
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};
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/// BlockInfoCodes - The blockinfo block contains metadata about user-defined
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/// blocks.
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enum BlockInfoCodes {
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// DEFINE_ABBREV has magic semantics here, applying to the current SETBID'd
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// block, instead of the BlockInfo block.
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BLOCKINFO_CODE_SETBID = 1, // SETBID: [blockid#]
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BLOCKINFO_CODE_BLOCKNAME = 2, // BLOCKNAME: [name]
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BLOCKINFO_CODE_SETRECORDNAME = 3 // BLOCKINFO_CODE_SETRECORDNAME: [id, name]
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};
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} // End bitc namespace
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/// BitCodeAbbrevOp - This describes one or more operands in an abbreviation.
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/// This is actually a union of two different things:
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/// 1. It could be a literal integer value ("the operand is always 17").
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/// 2. It could be an encoding specification ("this operand encoded like so").
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///
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class BitCodeAbbrevOp {
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uint64_t Val; // A literal value or data for an encoding.
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bool IsLiteral : 1; // Indicate whether this is a literal value or not.
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unsigned Enc : 3; // The encoding to use.
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public:
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enum Encoding {
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Fixed = 1, // A fixed width field, Val specifies number of bits.
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VBR = 2, // A VBR field where Val specifies the width of each chunk.
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Array = 3, // A sequence of fields, next field species elt encoding.
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Char6 = 4, // A 6-bit fixed field which maps to [a-zA-Z0-9._].
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Blob = 5 // 32-bit aligned array of 8-bit characters.
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};
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explicit BitCodeAbbrevOp(uint64_t V) : Val(V), IsLiteral(true) {}
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explicit BitCodeAbbrevOp(Encoding E, uint64_t Data = 0)
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: Val(Data), IsLiteral(false), Enc(E) {}
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bool isLiteral() const { return IsLiteral; }
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bool isEncoding() const { return !IsLiteral; }
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// Accessors for literals.
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uint64_t getLiteralValue() const { assert(isLiteral()); return Val; }
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// Accessors for encoding info.
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Encoding getEncoding() const { assert(isEncoding()); return (Encoding)Enc; }
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uint64_t getEncodingData() const {
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assert(isEncoding() && hasEncodingData());
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return Val;
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}
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bool hasEncodingData() const { return hasEncodingData(getEncoding()); }
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static bool hasEncodingData(Encoding E) {
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switch (E) {
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default: assert(0 && "Unknown encoding");
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case Fixed:
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case VBR:
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return true;
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case Array:
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case Char6:
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case Blob:
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return false;
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}
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}
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/// isChar6 - Return true if this character is legal in the Char6 encoding.
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static bool isChar6(char C) {
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if (C >= 'a' && C <= 'z') return true;
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if (C >= 'A' && C <= 'Z') return true;
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if (C >= '0' && C <= '9') return true;
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if (C == '.' || C == '_') return true;
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return false;
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}
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static unsigned EncodeChar6(char C) {
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if (C >= 'a' && C <= 'z') return C-'a';
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if (C >= 'A' && C <= 'Z') return C-'A'+26;
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if (C >= '0' && C <= '9') return C-'0'+26+26;
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if (C == '.') return 62;
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if (C == '_') return 63;
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assert(0 && "Not a value Char6 character!");
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return 0;
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}
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static char DecodeChar6(unsigned V) {
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assert((V & ~63) == 0 && "Not a Char6 encoded character!");
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if (V < 26) return V+'a';
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if (V < 26+26) return V-26+'A';
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if (V < 26+26+10) return V-26-26+'0';
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if (V == 62) return '.';
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if (V == 63) return '_';
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assert(0 && "Not a value Char6 character!");
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return ' ';
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}
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};
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/// BitCodeAbbrev - This class represents an abbreviation record. An
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/// abbreviation allows a complex record that has redundancy to be stored in a
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/// specialized format instead of the fully-general, fully-vbr, format.
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class BitCodeAbbrev {
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SmallVector<BitCodeAbbrevOp, 8> OperandList;
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unsigned char RefCount; // Number of things using this.
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~BitCodeAbbrev() {}
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public:
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BitCodeAbbrev() : RefCount(1) {}
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void addRef() { ++RefCount; }
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void dropRef() { if (--RefCount == 0) delete this; }
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unsigned getNumOperandInfos() const {
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return static_cast<unsigned>(OperandList.size());
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}
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const BitCodeAbbrevOp &getOperandInfo(unsigned N) const {
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return OperandList[N];
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}
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void Add(const BitCodeAbbrevOp &OpInfo) {
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OperandList.push_back(OpInfo);
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}
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};
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} // End llvm namespace
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#endif
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