org.spongepowered.asm.mixin.injection.points

Class BeforeReturn

java.lang.Object

org.spongepowered.asm.mixin.injection.InjectionPoint

org.spongepowered.asm.mixin.injection.points.BeforeReturn

public class BeforeReturn
extends InjectionPoint

This injection point searches for RETURN opcodes in the target method and returns a list of insns immediately prior to matching instructions. Note that every RETURN opcode will be returned and thus every natural exit from the method except for exception throws will be implicitly specified. To specify a particular RETURN use the ordinal parameter. The injection point accepts the following parameters from At:

ordinal

The ordinal position of the RETURN opcode to match, if not specified then the injection point returns all RETURN opcodes. For example if the RETURN opcode appears 3 times in the method and you want to match the 3rd then you can specify an ordinal of 2 (ordinals are zero-indexed). The default value is -1 which supresses ordinal matching

Example:

   @At(value = "RETURN")

Note that if value is the only parameter specified, it can be omitted:

   @At("RETURN")

Nested Class Summary

Nested classes/interfaces inherited from class org.spongepowered.asm.mixin.injection.InjectionPoint

InjectionPoint.AtCode, InjectionPoint.RestrictTargetLevel, InjectionPoint.Selector

Field Summary

Fields inherited from class org.spongepowered.asm.mixin.injection.InjectionPoint

DEFAULT_ALLOWED_SHIFT_BY, MAX_ALLOWED_SHIFT_BY

Constructor Summary

Constructors

Constructor and Description
BeforeReturn(InjectionPointData data)

Method Summary

Modifier and Type	Method and Description
boolean	checkPriority(int targetPriority, int ownerPriority) Runs a priority check in the context of this injection point.
boolean	find(java.lang.String desc, org.objectweb.asm.tree.InsnList insns, java.util.Collection<org.objectweb.asm.tree.AbstractInsnNode> nodes) Find injection points in the supplied insn list
InjectionPoint.RestrictTargetLevel	getTargetRestriction(IInjectionPointContext context) Returns the target restriction level for this injection point.

Methods inherited from class org.spongepowered.asm.mixin.injection.InjectionPoint

after, and, before, getAtCode, getId, getSelector, getSlice, nextNode, or, parse, parse, parse, parse, parse, parse, parse, register, shift, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

BeforeReturn

public BeforeReturn(InjectionPointData data)

Method Detail

checkPriority

public boolean checkPriority(int targetPriority,
                             int ownerPriority)

Description copied from class: InjectionPoint

Runs a priority check in the context of this injection point. A priority check should return true if the injection point is allowed to inject given the relative priorities of the target (a method merged by another mixin with targetPriority) and the incoming mixin with priority mixinPriority.

Overrides:

checkPriority in class InjectionPoint

Parameters:

targetPriority - Priority of the mixin which originally merged the target method in question

ownerPriority - Priority of the mixin which owns the owning injector

Returns:

true if the priority check succeeds

getTargetRestriction

public InjectionPoint.RestrictTargetLevel getTargetRestriction(IInjectionPointContext context)

Description copied from class: InjectionPoint

Returns the target restriction level for this injection point. This level defines whether an injection point is valid in its current state when being used by a restricted injector (currently CallbackInjector).

Overrides:

getTargetRestriction in class InjectionPoint

Parameters:

context - injection-specific context

Returns:

restriction level

find

public boolean find(java.lang.String desc,
                    org.objectweb.asm.tree.InsnList insns,
                    java.util.Collection<org.objectweb.asm.tree.AbstractInsnNode> nodes)

Description copied from class: InjectionPoint

Find injection points in the supplied insn list

Specified by:

find in class InjectionPoint

Parameters:

desc - Method descriptor, supplied to allow return types and arguments etc. to be determined

insns - Insn list to search in, the strategy MUST ONLY add nodes from this list to the nodes collection

nodes - Collection of nodes to populate. Injectors should NOT make any assumptions about the state of this collection and should only call the add() method

Returns:

true if one or more injection points were found