Package org.spongepowered.asm.mixin.injection.points

Class BeforeNew

java.lang.Object

org.spongepowered.asm.mixin.injection.InjectionPoint

org.spongepowered.asm.mixin.injection.points.BeforeNew

public class BeforeNew
extends InjectionPoint

This injection point searches for NEW opcodes matching its arguments and returns a list of insns immediately prior to matching instructions. It accepts the following parameters from At:

named argument: class (or specify using target

The value of the NEW node to look for, the fully-qualified class name

ordinal

The ordinal position of the NEW opcode to match. For example if the NEW 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

target

Target class can also be specified in target which also supports specifying the exact signature of the constructor to target. In this case the target type is specified as the return type of the constructor (in place of the usual V (void)) and no owner or name should be specified (they are ignored).

Examples:

   // Find all NEW opcodes for String
   @At(value = "NEW", args = "class=java/lang/String")

   // Find all NEW opcodes for String
   @At(value = "NEW", target = "java/lang/String"

   // Find all NEW opcodes for String which are constructed
   // using the ctor which takes an array of char
   @At(value = "NEW", target = "([C)Ljava/lang/String;"

Note that like all standard injection points, this class matches the insn itself, putting the injection point immediately before the access in question. Use shift specifier to adjust the matched opcode as necessary.

Nested Class Summary

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

InjectionPoint.AtCode, InjectionPoint.Flags, InjectionPoint.RestrictTargetLevel, InjectionPoint.Specifier

Field Summary

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

DEFAULT_ALLOWED_SHIFT_BY, MAX_ALLOWED_SHIFT_BY

Constructor Summary

Constructors

Constructor	Description
BeforeNew(InjectionPointData data)

Method Summary

Modifier and Type	Method	Description
boolean	find(String desc, org.objectweb.asm.tree.InsnList insns, Collection<org.objectweb.asm.tree.AbstractInsnNode> nodes)	Find injection points in the supplied insn list
static org.objectweb.asm.tree.MethodInsnNode	findInitNodeFor(org.objectweb.asm.tree.InsnList insns, org.objectweb.asm.tree.TypeInsnNode newNode, String desc)
String	getDescriptor()	Gets the descriptor from the injection point, can return null
boolean	hasDescriptor()	Returns whether this injection point has a constructor descriptor defined

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

addMessage, after, and, before, checkPriority, getAtCode, getId, getSlice, getSpecifier, getTargetRestriction, nextNode, or, parse, parse, parse, parse, parse, parse, parse, parse, register, register, setTargetRestriction, shift, toString

Methods inherited from class java.lang.Object

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

Constructor Details

BeforeNew

public BeforeNew(InjectionPointData data)

Method Details

hasDescriptor

public boolean hasDescriptor()

Returns whether this injection point has a constructor descriptor defined

getDescriptor

public String getDescriptor()

Gets the descriptor from the injection point, can return null

find

public boolean find(String desc,
 org.objectweb.asm.tree.InsnList insns,
 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

findInitNodeFor

public static org.objectweb.asm.tree.MethodInsnNode findInitNodeFor(org.objectweb.asm.tree.InsnList insns,
 org.objectweb.asm.tree.TypeInsnNode newNode,
 String desc)