Package ghidra.pcode.emu.jit.gen.op

Enum Class LoadOpGen

java.lang.Object

java.lang.Enum<LoadOpGen>

ghidra.pcode.emu.jit.gen.op.LoadOpGen

All Implemented Interfaces:

OpGen<JitLoadOp>, Serializable, Comparable<LoadOpGen>, Constable

public enum LoadOpGen
extends Enum<LoadOpGen>
implements OpGen<JitLoadOp>

The generator for a load.

These ops are currently presumed to be indirect memory accesses. TODO: If we fold constants, we could convert some of these to direct.

We request a field to pre-fetch the space and emit code to load it onto the stack. We then emit code to load the offset onto the stack and convert it to a JVM long, if necessary. The varnode size is loaded by emitting an ldc, and finally we emit an invocation of JitBytesPcodeExecutorStatePiece.JitBytesPcodeExecutorStateSpace.read(long, int). The result is a byte array, so we finish by emitting the appropriate conversion and write the result to the output operand.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Nested classes/interfaces inherited from interface ghidra.pcode.emu.jit.gen.op.OpGen

OpGen.DeadOpResult, OpGen.LiveOpResult, OpGen.OpResult

Enum Constant Summary

Enum Constants

Enum Constant	Description
GEN	The generator singleton

Method Summary

Modifier and Type	Method	Description
<THIS extends JitCompiledPassage> OpGen.OpResult	genRun(Emitter<Emitter.Bot> em, Local<Types.TRef<THIS>> localThis, Local<Types.TInt> localCtxmod, Methods.RetReq<Types.TRef<JitCompiledPassage.EntryPoint>> retReq, JitCodeGenerator<THIS> gen, JitLoadOp op, JitControlFlowModel.JitBlock block, Scope scope)	Emit bytecode into the run method.
static LoadOpGen	valueOf(String name)	Returns the enum constant of this class with the specified name.
static LoadOpGen[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

GEN

public static final LoadOpGen GEN

The generator singleton

Method Details

values

public static LoadOpGen[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static LoadOpGen valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null

genRun

public <THIS extends JitCompiledPassage>
OpGen.OpResult genRun(Emitter<Emitter.Bot> em,
 Local<Types.TRef<THIS>> localThis,
 Local<Types.TInt> localCtxmod,
 Methods.RetReq<Types.TRef<JitCompiledPassage.EntryPoint>> retReq,
 JitCodeGenerator<THIS> gen,
 JitLoadOp op,
 JitControlFlowModel.JitBlock block,
 Scope scope)

Description copied from interface: OpGen

Emit bytecode into the run method.

This method must emit the code needed to load any input operands, convert them to the appropriate type, perform the actual operation, and then if applicable, store the output operand. The implementations should delegate to JitCodeGenerator.genReadToStack(Emitter, Local, JitVal, ghidra.pcode.emu.jit.analysis.JitType.SimpleJitType, Ext), JitCodeGenerator.genWriteFromStack(Emitter, Local, JitVar, ghidra.pcode.emu.jit.analysis.JitType.SimpleJitType, Ext, Scope) or similar for mp-int types.

Specified by:

genRun in interface OpGen<JitLoadOp>

Type Parameters:

THIS - the type of the generated passage

Parameters:

em - the emitter typed with the empty stack

localThis - a handle to the local holding the this reference

localCtxmod - a handle to the local holding ctxmod

retReq - an indication of what must be returned by this JitCompiledPassage.run(int) method.

gen - the code generator

op - the p-code op (use-def node) to translate

block - the basic block containing the p-code op

scope - a scope for generating temporary local storage

Returns:

the result of emitting the p-code op's bytecode