forked from OSchip/llvm-project
295 lines
12 KiB
C++
295 lines
12 KiB
C++
//===- X86DisassemblerTables.h - Disassembler tables ------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file is part of the X86 Disassembler Emitter.
|
|
// It contains the interface of the disassembler tables.
|
|
// Documentation for the disassembler emitter in general can be found in
|
|
// X86DisasemblerEmitter.h.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef X86DISASSEMBLERTABLES_H
|
|
#define X86DISASSEMBLERTABLES_H
|
|
|
|
#include "X86DisassemblerShared.h"
|
|
#include "X86ModRMFilters.h"
|
|
|
|
#include "llvm/Support/raw_ostream.h"
|
|
|
|
#include <vector>
|
|
|
|
namespace llvm {
|
|
|
|
namespace X86Disassembler {
|
|
|
|
/// DisassemblerTables - Encapsulates all the decode tables being generated by
|
|
/// the table emitter. Contains functions to populate the tables as well as
|
|
/// to emit them as hierarchical C structures suitable for consumption by the
|
|
/// runtime.
|
|
class DisassemblerTables {
|
|
private:
|
|
/// The decoder tables. There is one for each opcode type:
|
|
/// [0] one-byte opcodes
|
|
/// [1] two-byte opcodes of the form 0f __
|
|
/// [2] three-byte opcodes of the form 0f 38 __
|
|
/// [3] three-byte opcodes of the form 0f 3a __
|
|
/// [4] three-byte opcodes of the form 0f a6 __
|
|
/// [5] three-byte opcodes of the form 0f a7 __
|
|
ContextDecision* Tables[6];
|
|
|
|
/// The instruction information table
|
|
std::vector<InstructionSpecifier> InstructionSpecifiers;
|
|
|
|
/// True if there are primary decode conflicts in the instruction set
|
|
bool HasConflicts;
|
|
|
|
/// emitOneID - Emits a table entry for a single instruction entry, at the
|
|
/// innermost level of the structure hierarchy. The entry is printed out
|
|
/// in the format "nnnn, /* MNEMONIC */" where nnnn is the ID in decimal,
|
|
/// the comma is printed if addComma is true, and the menonic is the name
|
|
/// of the instruction as listed in the LLVM tables.
|
|
///
|
|
/// @param o - The output stream to print the entry on.
|
|
/// @param i - The indentation level for o.
|
|
/// @param id - The unique ID of the instruction to print.
|
|
/// @param addComma - Whether or not to print a comma after the ID. True if
|
|
/// additional items will follow.
|
|
void emitOneID(raw_ostream &o,
|
|
uint32_t &i,
|
|
InstrUID id,
|
|
bool addComma) const;
|
|
|
|
/// emitModRMDecision - Emits a table of entries corresponding to a single
|
|
/// ModR/M decision. Compacts the ModR/M decision if possible. ModR/M
|
|
/// decisions are printed as:
|
|
///
|
|
/// { /* struct ModRMDecision */
|
|
/// TYPE,
|
|
/// modRMTablennnn
|
|
/// }
|
|
///
|
|
/// where nnnn is a unique ID for the corresponding table of IDs.
|
|
/// TYPE indicates whether the table has one entry that is the same
|
|
/// regardless of ModR/M byte, two entries - one for bytes 0x00-0xbf and one
|
|
/// for bytes 0xc0-0xff -, or 256 entries, one for each possible byte.
|
|
/// nnnn is the number of a table for looking up these values. The tables
|
|
/// are writen separately so that tables consisting entirely of zeros will
|
|
/// not be duplicated. (These all have the name modRMEmptyTable.) A table
|
|
/// is printed as:
|
|
///
|
|
/// InstrUID modRMTablennnn[k] = {
|
|
/// nnnn, /* MNEMONIC */
|
|
/// ...
|
|
/// nnnn /* MNEMONIC */
|
|
/// };
|
|
///
|
|
/// @param o1 - The output stream to print the ID table to.
|
|
/// @param o2 - The output stream to print the decision structure to.
|
|
/// @param i1 - The indentation level to use with stream o1.
|
|
/// @param i2 - The indentation level to use with stream o2.
|
|
/// @param decision - The ModR/M decision to emit. This decision has 256
|
|
/// entries - emitModRMDecision decides how to compact it.
|
|
void emitModRMDecision(raw_ostream &o1,
|
|
raw_ostream &o2,
|
|
uint32_t &i1,
|
|
uint32_t &i2,
|
|
ModRMDecision &decision) const;
|
|
|
|
/// emitOpcodeDecision - Emits an OpcodeDecision and all its subsidiary ModR/M
|
|
/// decisions. An OpcodeDecision is printed as:
|
|
///
|
|
/// { /* struct OpcodeDecision */
|
|
/// /* 0x00 */
|
|
/// { /* struct ModRMDecision */
|
|
/// ...
|
|
/// }
|
|
/// ...
|
|
/// }
|
|
///
|
|
/// where the ModRMDecision structure is printed as described in the
|
|
/// documentation for emitModRMDecision(). emitOpcodeDecision() passes on a
|
|
/// stream and indent level for the UID tables generated by
|
|
/// emitModRMDecision(), but does not use them itself.
|
|
///
|
|
/// @param o1 - The output stream to print the ID tables generated by
|
|
/// emitModRMDecision() to.
|
|
/// @param o2 - The output stream for the decision structure itself.
|
|
/// @param i1 - The indent level to use with stream o1.
|
|
/// @param i2 - The indent level to use with stream o2.
|
|
/// @param decision - The OpcodeDecision to emit along with its subsidiary
|
|
/// structures.
|
|
void emitOpcodeDecision(raw_ostream &o1,
|
|
raw_ostream &o2,
|
|
uint32_t &i1,
|
|
uint32_t &i2,
|
|
OpcodeDecision &decision) const;
|
|
|
|
/// emitContextDecision - Emits a ContextDecision and all its subsidiary
|
|
/// Opcode and ModRMDecisions. A ContextDecision is printed as:
|
|
///
|
|
/// struct ContextDecision NAME = {
|
|
/// { /* OpcodeDecisions */
|
|
/// /* IC */
|
|
/// { /* struct OpcodeDecision */
|
|
/// ...
|
|
/// },
|
|
/// ...
|
|
/// }
|
|
/// }
|
|
///
|
|
/// NAME is the name of the ContextDecision (typically one of the four names
|
|
/// ONEBYTE_SYM, TWOBYTE_SYM, THREEBYTE38_SYM, THREEBYTE3A_SYM,
|
|
/// THREEBYTEA6_SYM, and THREEBYTEA7_SYM from
|
|
/// X86DisassemblerDecoderCommon.h).
|
|
/// IC is one of the contexts in InstructionContext. There is an opcode
|
|
/// decision for each possible context.
|
|
/// The OpcodeDecision structures are printed as described in the
|
|
/// documentation for emitOpcodeDecision.
|
|
///
|
|
/// @param o1 - The output stream to print the ID tables generated by
|
|
/// emitModRMDecision() to.
|
|
/// @param o2 - The output stream to print the decision structure to.
|
|
/// @param i1 - The indent level to use with stream o1.
|
|
/// @param i2 - The indent level to use with stream o2.
|
|
/// @param decision - The ContextDecision to emit along with its subsidiary
|
|
/// structures.
|
|
/// @param name - The name for the ContextDecision.
|
|
void emitContextDecision(raw_ostream &o1,
|
|
raw_ostream &o2,
|
|
uint32_t &i1,
|
|
uint32_t &i2,
|
|
ContextDecision &decision,
|
|
const char* name) const;
|
|
|
|
/// emitInstructionInfo - Prints the instruction specifier table, which has
|
|
/// one entry for each instruction, and contains name and operand
|
|
/// information. This table is printed as:
|
|
///
|
|
/// struct InstructionSpecifier CONTEXTS_SYM[k] = {
|
|
/// {
|
|
/// /* nnnn */
|
|
/// "MNEMONIC",
|
|
/// 0xnn,
|
|
/// {
|
|
/// {
|
|
/// ENCODING,
|
|
/// TYPE
|
|
/// },
|
|
/// ...
|
|
/// }
|
|
/// },
|
|
/// };
|
|
///
|
|
/// k is the total number of instructions.
|
|
/// nnnn is the ID of the current instruction (0-based). This table
|
|
/// includes entries for non-instructions like PHINODE.
|
|
/// 0xnn is the lowest possible opcode for the current instruction, used for
|
|
/// AddRegFrm instructions to compute the operand's value.
|
|
/// ENCODING and TYPE describe the encoding and type for a single operand.
|
|
///
|
|
/// @param o - The output stream to which the instruction table should be
|
|
/// written.
|
|
/// @param i - The indent level for use with the stream.
|
|
void emitInstructionInfo(raw_ostream &o, uint32_t &i) const;
|
|
|
|
/// emitContextTable - Prints the table that is used to translate from an
|
|
/// instruction attribute mask to an instruction context. This table is
|
|
/// printed as:
|
|
///
|
|
/// InstructionContext CONTEXTS_STR[256] = {
|
|
/// IC, /* 0x00 */
|
|
/// ...
|
|
/// };
|
|
///
|
|
/// IC is the context corresponding to the mask 0x00, and there are 256
|
|
/// possible masks.
|
|
///
|
|
/// @param o - The output stream to which the context table should be written.
|
|
/// @param i - The indent level for use with the stream.
|
|
void emitContextTable(raw_ostream &o, uint32_t &i) const;
|
|
|
|
/// emitContextDecisions - Prints all four ContextDecision structures using
|
|
/// emitContextDecision().
|
|
///
|
|
/// @param o1 - The output stream to print the ID tables generated by
|
|
/// emitModRMDecision() to.
|
|
/// @param o2 - The output stream to print the decision structures to.
|
|
/// @param i1 - The indent level to use with stream o1.
|
|
/// @param i2 - The indent level to use with stream o2.
|
|
void emitContextDecisions(raw_ostream &o1,
|
|
raw_ostream &o2,
|
|
uint32_t &i1,
|
|
uint32_t &i2) const;
|
|
|
|
/// setTableFields - Uses a ModRMFilter to set the appropriate entries in a
|
|
/// ModRMDecision to refer to a particular instruction ID.
|
|
///
|
|
/// @param decision - The ModRMDecision to populate.
|
|
/// @param filter - The filter to use in deciding which entries to populate.
|
|
/// @param uid - The unique ID to set matching entries to.
|
|
/// @param opcode - The opcode of the instruction, for error reporting.
|
|
void setTableFields(ModRMDecision &decision,
|
|
const ModRMFilter &filter,
|
|
InstrUID uid,
|
|
uint8_t opcode);
|
|
public:
|
|
/// Constructor - Allocates space for the class decisions and clears them.
|
|
DisassemblerTables();
|
|
|
|
~DisassemblerTables();
|
|
|
|
/// emit - Emits the instruction table, context table, and class decisions.
|
|
///
|
|
/// @param o - The output stream to print the tables to.
|
|
void emit(raw_ostream &o) const;
|
|
|
|
/// setTableFields - Uses the opcode type, instruction context, opcode, and a
|
|
/// ModRMFilter as criteria to set a particular set of entries in the
|
|
/// decode tables to point to a specific uid.
|
|
///
|
|
/// @param type - The opcode type (ONEBYTE, TWOBYTE, etc.)
|
|
/// @param insnContext - The context to use (IC, IC_64BIT, etc.)
|
|
/// @param opcode - The last byte of the opcode (not counting any escape
|
|
/// or extended opcodes).
|
|
/// @param filter - The ModRMFilter that decides which ModR/M byte values
|
|
/// correspond to the desired instruction.
|
|
/// @param uid - The unique ID of the instruction.
|
|
void setTableFields(OpcodeType type,
|
|
InstructionContext insnContext,
|
|
uint8_t opcode,
|
|
const ModRMFilter &filter,
|
|
InstrUID uid);
|
|
|
|
/// specForUID - Returns the instruction specifier for a given unique
|
|
/// instruction ID. Used when resolving collisions.
|
|
///
|
|
/// @param uid - The unique ID of the instruction.
|
|
/// @return - A reference to the instruction specifier.
|
|
InstructionSpecifier& specForUID(InstrUID uid) {
|
|
if (uid >= InstructionSpecifiers.size())
|
|
InstructionSpecifiers.resize(uid + 1);
|
|
|
|
return InstructionSpecifiers[uid];
|
|
}
|
|
|
|
// hasConflicts - Reports whether there were primary decode conflicts
|
|
// from any instructions added to the tables.
|
|
// @return - true if there were; false otherwise.
|
|
|
|
bool hasConflicts() {
|
|
return HasConflicts;
|
|
}
|
|
};
|
|
|
|
} // namespace X86Disassembler
|
|
|
|
} // namespace llvm
|
|
|
|
#endif
|