Package javassist.bytecode
Class StackMapTable.Walker
- java.lang.Object
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- javassist.bytecode.StackMapTable.Walker
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- Enclosing class:
- StackMapTable
public static class StackMapTable.Walker extends Object
A code walker for a StackMapTable attribute.
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Constructor Summary
Constructors Constructor Description Walker(byte[] data)Constructs a walker.Walker(StackMapTable smt)Constructs a walker.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description voidappendFrame(int pos, int offsetDelta, int[] tags, int[] data)Invoked if the visited frame is aappend_frame.voidchopFrame(int pos, int offsetDelta, int k)Invoked if the visited frame is achop_frame.voidfullFrame(int pos, int offsetDelta, int[] localTags, int[] localData, int[] stackTags, int[] stackData)Invoked if the visited frame isfull_frame.voidobjectOrUninitialized(int tag, int data, int pos)Invoked ifObject_variable_infoorUninitialized_variable_infois visited.voidparse()Visits each entry of the stack map frames.voidsameFrame(int pos, int offsetDelta)Invoked if the visited frame is asame_frameor asame_frame_extended.voidsameLocals(int pos, int offsetDelta, int stackTag, int stackData)Invoked if the visited frame is asame_locals_1_stack_item_frameor asame_locals_1_stack_item_frame_extended.intsize()Returns the number of the entries.
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Constructor Detail
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Walker
public Walker(StackMapTable smt)
Constructs a walker.- Parameters:
smt- the StackMapTable that this walker walks around.
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Walker
public Walker(byte[] data)
Constructs a walker.- Parameters:
data- theinfofield of theattribute_infostructure. It can be obtained byget()in theAttributeInfoclass.
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Method Detail
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size
public final int size()
Returns the number of the entries.
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parse
public void parse() throws BadBytecodeVisits each entry of the stack map frames.- Throws:
BadBytecode
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sameFrame
public void sameFrame(int pos, int offsetDelta) throws BadBytecodeInvoked if the visited frame is asame_frameor asame_frame_extended.- Parameters:
pos- the position of this frame in theinfofield ofattribute_infostructure.offsetDelta-- Throws:
BadBytecode
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sameLocals
public void sameLocals(int pos, int offsetDelta, int stackTag, int stackData) throws BadBytecodeInvoked if the visited frame is asame_locals_1_stack_item_frameor asame_locals_1_stack_item_frame_extended.- Parameters:
pos- the position.offsetDelta-stackTag-stack[0].tag.stackData-stack[0].cpool_indexif the tag isOBJECT, orstack[0].offsetif the tag isUNINIT.- Throws:
BadBytecode
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chopFrame
public void chopFrame(int pos, int offsetDelta, int k) throws BadBytecodeInvoked if the visited frame is achop_frame.- Parameters:
pos- the position.offsetDelta-k- theklast locals are absent.- Throws:
BadBytecode
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appendFrame
public void appendFrame(int pos, int offsetDelta, int[] tags, int[] data) throws BadBytecodeInvoked if the visited frame is aappend_frame.- Parameters:
pos- the position.offsetDelta-tags-locals[i].tag.data-locals[i].cpool_indexorlocals[i].offset.- Throws:
BadBytecode
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fullFrame
public void fullFrame(int pos, int offsetDelta, int[] localTags, int[] localData, int[] stackTags, int[] stackData) throws BadBytecodeInvoked if the visited frame isfull_frame.- Parameters:
pos- the position.offsetDelta-localTags-locals[i].taglocalData-locals[i].cpool_indexorlocals[i].offsetstackTags-stack[i].tagstackData-stack[i].cpool_indexorstack[i].offset- Throws:
BadBytecode
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objectOrUninitialized
public void objectOrUninitialized(int tag, int data, int pos)Invoked ifObject_variable_infoorUninitialized_variable_infois visited.- Parameters:
tag-OBJECTorUNINIT.data- the value ofcpool_indexoroffset.pos- the position ofcpool_indexoroffset.
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