Class WasmLocalInstruction

java.lang.Object

de.inetsoftware.jwebassembly.module.WasmInstruction

de.inetsoftware.jwebassembly.module.WasmLocalInstruction

Direct Known Subclasses:

WasmLoadStoreInstruction

class WasmLocalInstruction
extends WasmInstruction

WasmInstruction for load and store local variables.

Nested Class Summary

Nested classes/interfaces inherited from class WasmInstruction

WasmInstruction.Type

Field Summary

Fields

Modifier and Type	Field	Description
private int	idx	The variable slot (Java) for WasmLoadStoreInstruction and the WebAssembly variable index for a WasmLocalInstruction instance.
(package private) final LocaleVariableManager	localVariables
private VariableOperator	op
private AnyType	pushValueType

Constructor Summary

Constructors

Constructor	Description
WasmLocalInstruction(VariableOperator op, int idx, LocaleVariableManager localVariables, int javaCodePos, int lineNumber)	Create an instance of a load/store instruction for a local variable.

Method Summary

Modifier and Type	Method	Description
(package private) int	getIndex()	Get the number of the locals
(package private) VariableOperator	getOperator()	Get the operator
(package private) int	getPopCount()	Get the count of values that are removed from the stack.
(package private) AnyType[]	getPopValueTypes()
(package private) AnyType	getPushValueType()	Get the ValueType if this instruction push a value on the stack.
(package private) int	getSlot()	Get the slot of the locals
(package private) WasmInstruction.Type	getType()	Get the type of instruction
(package private) void	setOperator(VariableOperator op)	Set the operator
void	writeTo(ModuleWriter writer)	Write this instruction to the WASM module.

Methods inherited from class WasmInstruction

getCodePosition, getLineNumber, setCodePosition

Methods inherited from class Object

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

Field Details

op

@Nonnull
private VariableOperator op

idx

private int idx

The variable slot (Java) for WasmLoadStoreInstruction and the WebAssembly variable index for a WasmLocalInstruction instance.

localVariables

final LocaleVariableManager localVariables

pushValueType

private AnyType pushValueType

Constructor Details

WasmLocalInstruction

WasmLocalInstruction(@Nonnull
 VariableOperator op,
 @Nonnegative
 int idx,
 LocaleVariableManager localVariables,
 int javaCodePos,
 int lineNumber)

Create an instance of a load/store instruction for a local variable.

Parameters:

op - the operation

idx - the memory/slot idx of the variable

localVariables - the manager for local variables

javaCodePos - the code position/offset in the Java method

lineNumber - the line number in the Java source code

Method Details

getType

WasmInstruction.Type getType()

Get the type of instruction

Specified by:

getType in class WasmInstruction

Returns:

the type

getOperator

@Nonnull
VariableOperator getOperator()

Get the operator

Returns:

the operator

setOperator

void setOperator(@Nonnull
 VariableOperator op)

Set the operator

Parameters:

op - the operator

getSlot

@Nonnegative
int getSlot()

Get the slot of the locals

Returns:

the Java slot for the variable

getIndex

@Nonnegative
int getIndex()

Get the number of the locals

Returns:

the index, mostly the Wasm Index

writeTo

public void writeTo(@Nonnull
 ModuleWriter writer)
             throws IOException

Write this instruction to the WASM module.

Specified by:

writeTo in class WasmInstruction

Parameters:

writer - the target writer

Throws:

IOException - if any I/O error occur

getPushValueType

AnyType getPushValueType()

Get the ValueType if this instruction push a value on the stack.

Specified by:

getPushValueType in class WasmInstruction

Returns:

the ValueType or null if no value is push

getPopCount

int getPopCount()

Get the count of values that are removed from the stack.

Specified by:

getPopCount in class WasmInstruction

Returns:

the count

getPopValueTypes

AnyType[] getPopValueTypes()

Specified by:

getPopValueTypes in class WasmInstruction