Package ghidra.pcode.emu.jit

Class JitPassage.DecodedPcodeOp

java.lang.Object

ghidra.program.model.pcode.PcodeOp

ghidra.pcode.emu.jit.JitPassage.DecodedPcodeOp

Direct Known Subclasses:

JitPassage.DecodeErrorPcodeOp, JitPassage.NopPcodeOp

Enclosing class:

JitPassage

public static class JitPassage.DecodedPcodeOp
extends PcodeOp

An extension of PcodeOp that carries along with it the address and decode context where it occurred.

There is a difference between at's address vs. seqnum's target. The former is determined by the JitPassageDecoder and applied to all p-code ops generated at that address (and context value), including those from injected Sleigh. The latter is determined by the Instruction (or injected PcodeProgram), which have less information about their origins. There are also JitPassage.DecodeErrorPcodeOp and JitPassage.NopPcodeOp, which are synthesized by the JitPassageDecoder without an instruction or inject. This information is required for bookkeeping, esp., when updating the emulator's program counter and decode context when a p-code op produces an unexpected run-time error.

Field Summary

Fields inherited from class ghidra.program.model.pcode.PcodeOp

BOOL_AND, BOOL_NEGATE, BOOL_OR, BOOL_XOR, BRANCH, BRANCHIND, CALL, CALLIND, CALLOTHER, CAST, CBRANCH, COPY, CPOOLREF, EXTRACT, FLOAT_ABS, FLOAT_ADD, FLOAT_CEIL, FLOAT_DIV, FLOAT_EQUAL, FLOAT_FLOAT2FLOAT, FLOAT_FLOOR, FLOAT_INT2FLOAT, FLOAT_LESS, FLOAT_LESSEQUAL, FLOAT_MULT, FLOAT_NAN, FLOAT_NEG, FLOAT_NOTEQUAL, FLOAT_ROUND, FLOAT_SQRT, FLOAT_SUB, FLOAT_TRUNC, INDIRECT, INSERT, INT_2COMP, INT_ADD, INT_AND, INT_CARRY, INT_DIV, INT_EQUAL, INT_LEFT, INT_LESS, INT_LESSEQUAL, INT_MULT, INT_NEGATE, INT_NOTEQUAL, INT_OR, INT_REM, INT_RIGHT, INT_SBORROW, INT_SCARRY, INT_SDIV, INT_SEXT, INT_SLESS, INT_SLESSEQUAL, INT_SREM, INT_SRIGHT, INT_SUB, INT_XOR, INT_ZEXT, LOAD, LZCOUNT, MULTIEQUAL, NEW, PCODE_MAX, PIECE, POPCOUNT, PTRADD, PTRSUB, RETURN, SEGMENTOP, STORE, SUBPIECE, UNIMPLEMENTED

Constructor Summary

Constructors

Constructor	Description
DecodedPcodeOp(JitPassage.AddrCtx at, PcodeOp original)	Re-write a p-code op including its address and context value

Method Summary

Modifier and Type	Method	Description
JitPassage.AddrCtx	getAt()	Get the address and context value where this op was produced
RegisterValue	getContext()	Get the decode context where this op was produced
Address	getCounter()	Get the address where this op was produced
boolean	isInstructionStart()	Check if this op represents the start of an instruction

Methods inherited from class ghidra.program.model.pcode.PcodeOp

decode, encodeRaw, getBasicIter, getInput, getInputs, getInsertIter, getMnemonic, getMnemonic, getNumInputs, getOpcode, getOpcode, getOutput, getParent, getSeqnum, getSlot, hashCode, insertInput, isAssignment, isCommutative, isCommutative, isDead, removeInput, setInput, setOpcode, setOrder, setOutput, setTime, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

DecodedPcodeOp

public DecodedPcodeOp(JitPassage.AddrCtx at,
 PcodeOp original)

Re-write a p-code op including its address and context value

Aside from at, everything is copied from the given original p-code op.

Parameters:

at - the address and context value where the op was produced

original - the original p-code op

Method Details

getAt

public JitPassage.AddrCtx getAt()

Get the address and context value where this op was produced

Returns:

the address-context pair

getCounter

public Address getCounter()

Get the address where this op was produced

Returns:

the address

getContext

public RegisterValue getContext()

Get the decode context where this op was produced

Returns:

the decode context

isInstructionStart

public boolean isInstructionStart()

Check if this op represents the start of an instruction

If this p-code op was produced by an inject, this will return false! It only returns true for an op that is genuinely the first op in the result of Instruction.getPcode(). WARNING: This should not be used for branching purposes, because branches to a given address are meant to target any injections there, too. Currently, this is used only to count the number of instructions actually executed.

Returns:

true if this op is the first of an instruction

See Also:

• JitControlFlowModel.JitBlock.instructionCount()
• JitCompiledPassage.count(int, int)
• JitPcodeThread.count(int, int)