public class CodeContext extends Object
Modifier and Type | Class and Description |
---|---|
static interface |
CodeContext.FixUp
A throw-in interface that marks
CodeContext.Offset s
as "fix-ups": During the execution of
fixUp() , all "fix-ups" are invoked and
can do last touches to the code attribute. |
class |
CodeContext.Inserter
A class that implements an insertion point into a "Code" attribute.
|
class |
CodeContext.LineNumberOffset
An
CodeContext.Offset who#s sole purpose is to later create a 'LneNumberTable' attribute. |
class |
CodeContext.Offset
A class that represents an offset within a "Code" attribute.
|
Constructor and Description |
---|
CodeContext(ClassFile classFile,
String functionName)
Creates an empty "Code" attribute.
|
Modifier and Type | Method and Description |
---|---|
void |
addExceptionTableEntry(CodeContext.Offset startPc,
CodeContext.Offset endPc,
CodeContext.Offset handlerPc,
String catchTypeFd)
Add another entry to the "exception_table" of this code attribute (see JVMS 4.7.3).
|
short |
allocateLocalVariable(short size)
Allocate space for a local variable of the given size (1 or 2)
on the local variable array.
|
Java.LocalVariableSlot |
allocateLocalVariable(short size,
String name,
IClass type)
Allocate space for a local variable of the given size (1 or 2)
on the local variable array.
|
CodeContext.Inserter |
currentInserter() |
void |
fixUpAndRelocate()
Fixes up all of the offsets and relocate() all relocatables.
|
void |
flowAnalysis(String functionName)
Checks the code for consistency; updates the "maxStack" member.
|
List<Java.LocalVariableSlot> |
getAllLocalVars() |
ClassFile |
getClassFile()
The
ClassFile this context is related to. |
void |
makeSpace(short lineNumber,
int size)
Add space for
size bytes at current offset. |
CodeContext.Inserter |
newInserter()
Allocate an
CodeContext.Inserter , set it to the current offset, and
insert it before the current offset. |
CodeContext.Offset |
newOffset()
Creates and inserts an
CodeContext.Offset at the current inserter's current position. |
void |
popInserter()
Replace the current
CodeContext.Inserter with the remembered one (see
pushInserter(CodeContext.Inserter) ). |
void |
pushInserter(CodeContext.Inserter ins)
Remember the current
CodeContext.Inserter , then replace it with the new one. |
void |
removeCode(CodeContext.Offset from,
CodeContext.Offset to)
Removes all code between
from and to . |
void |
restoreLocalVariables()
Restore the previous size of the local variables array.
|
List<Java.LocalVariableSlot> |
saveLocalVariables()
Remembers the current size of the local variables array.
|
protected void |
storeCodeAttributeBody(DataOutputStream dos,
short lineNumberTableAttributeNameIndex,
short localVariableTableAttributeNameIndex) |
protected ClassFile.AttributeInfo |
storeLocalVariableTable(DataOutputStream dos,
short localVariableTableAttributeNameIndex) |
void |
write(short lineNumber,
byte b1)
Inserts a byte at the current insertion position.
|
void |
write(short lineNumber,
byte[] b)
Inserts a sequence of bytes at the current insertion position.
|
void |
write(short lineNumber,
byte b1,
byte b2)
Inserts bytes at the current insertion position.
|
void |
write(short lineNumber,
byte b1,
byte b2,
byte b3)
Inserts bytes at the current insertion position.
|
void |
write(short lineNumber,
byte b1,
byte b2,
byte b3,
byte b4)
Inserts bytes at the current insertion position.
|
void |
writeBranch(short lineNumber,
int opcode,
CodeContext.Offset dst) |
void |
writeOffset(short lineNumber,
CodeContext.Offset src,
CodeContext.Offset dst)
Writes a four-byte offset (as it is used in TABLESWITCH and LOOKUPSWITCH) into this code context.
|
void |
writeShort(short lineNumber,
int v) |
public short allocateLocalVariable(short size)
saveLocalVariables()
and later restoreLocalVariables()
.size
- The number of slots to allocate (1 or 2)public Java.LocalVariableSlot allocateLocalVariable(short size, String name, IClass type)
saveLocalVariables()
and later restoreLocalVariables()
.size
- Number of slots to use (1 or 2)name
- The variable name, if it's null, the variable won't be written to the localvariabletabletype
- The variable type. if the name isn't null, the type is needed to write to the localvariabletablepublic List<Java.LocalVariableSlot> saveLocalVariables()
public void restoreLocalVariables()
protected void storeCodeAttributeBody(DataOutputStream dos, short lineNumberTableAttributeNameIndex, short localVariableTableAttributeNameIndex) throws IOException
dos
- lineNumberTableAttributeNameIndex
- 0 == don't generate a "LineNumberTable" attributeIOException
protected ClassFile.AttributeInfo storeLocalVariableTable(DataOutputStream dos, short localVariableTableAttributeNameIndex)
ClassFile.LocalVariableTableAttribute
for this CodeContext
public void flowAnalysis(String functionName)
public void fixUpAndRelocate()
public void write(short lineNumber, byte[] b)
CodeContext.LineNumberOffset
s as necessary.lineNumber
- The line number that corresponds to the byte code, or -1b
- public void write(short lineNumber, byte b1)
CodeContext.LineNumberOffset
s as necessary.
This method is an optimization to avoid allocating small byte[] and ease GC load.
lineNumber
- The line number that corresponds to the byte code, or -1b1
- public void write(short lineNumber, byte b1, byte b2)
CodeContext.LineNumberOffset
s as necessary.
This method is an optimization to avoid allocating small byte[] and ease GC load.
lineNumber
- The line number that corresponds to the byte code, or -1b1
- b2
- public void write(short lineNumber, byte b1, byte b2, byte b3)
CodeContext.LineNumberOffset
s as necessary.
This method is an optimization to avoid allocating small byte[] and ease GC load.
lineNumber
- The line number that corresponds to the byte code, or -1b1
- b2
- b3
- public void write(short lineNumber, byte b1, byte b2, byte b3, byte b4)
CodeContext.LineNumberOffset
s as necessary.
This method is an optimization to avoid allocating small byte[] and ease GC load.
lineNumber
- The line number that corresponds to the byte code, or -1b1
- b2
- b3
- b4
- public void makeSpace(short lineNumber, int size)
size
bytes at current offset. Creates CodeContext.LineNumberOffset
s as necessary.lineNumber
- The line number that corresponds to the byte code, or -1size
- The size in bytes to injectpublic void writeShort(short lineNumber, int v)
lineNumber
- The line number that corresponds to the byte code, or -1public void writeBranch(short lineNumber, int opcode, CodeContext.Offset dst)
lineNumber
- The line number that corresponds to the byte code, or -1public void writeOffset(short lineNumber, CodeContext.Offset src, CodeContext.Offset dst)
public CodeContext.Offset newOffset()
CodeContext.Offset
at the current inserter's current position.public CodeContext.Inserter newInserter()
CodeContext.Inserter
, set it to the current offset, and
insert it before the current offset.
In clear text, this means that you can continue writing to the
"Code" attribute, then pushInserter(CodeContext.Inserter)
the
CodeContext.Inserter
, then write again (which inserts bytes into the
"Code" attribute at the previously remembered position), and then
popInserter()
.public CodeContext.Inserter currentInserter()
public void pushInserter(CodeContext.Inserter ins)
CodeContext.Inserter
, then replace it with the new one.public void popInserter()
CodeContext.Inserter
with the remembered one (see
pushInserter(CodeContext.Inserter)
).public void addExceptionTableEntry(CodeContext.Offset startPc, CodeContext.Offset endPc, CodeContext.Offset handlerPc, String catchTypeFd)
catchTypeFd
- null == "finally" clausepublic List<Java.LocalVariableSlot> getAllLocalVars()
CodeContext
public void removeCode(CodeContext.Offset from, CodeContext.Offset to)
from
and to
. Also removes any CodeContext.Relocatable
s existing
in that range.Copyright © 2001–2016. All rights reserved.