/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2005 INRIA, France Telecom
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.objectweb.asm;
/**
* A visitor to visit a Java method. The methods of this interface must be
* called in the following order: [ <tt>visitAnnotationDefault</tt> ] (
* <tt>visitAnnotation</tt> | <tt>visitParameterAnnotation</tt> |
* <tt>visitAttribute</tt> )* [ <tt>visitCode</tt> ( <tt>visit</tt><i>X</i>Insn</tt> |
* <tt>visitLabel</tt> | <tt>visitTryCatchBlock</tt> | <tt>visitLocalVariable</tt> |
* <tt>visitLineNumber</tt>)* <tt>visitMaxs</tt> ] <tt>visitEnd</tt>. In
* addition, the <tt>visit</tt><i>X</i>Insn</tt> and <tt>visitLabel</tt>
* methods must be called in the sequential order of the bytecode instructions
* of the visited code, and the <tt>visitLocalVariable</tt> and <tt>visitLineNumber</tt>
* methods must be called <i>after</i> the labels passed as arguments have been
* visited.
*
* @author Eric Bruneton
*/
public interface MethodVisitor {
// -------------------------------------------------------------------------
// Annotations and non standard attributes
// -------------------------------------------------------------------------
/**
* Visits the default value of this annotation interface method.
*
* @return a non null visitor to the visit the actual default value of this
* annotation interface method. The 'name' parameters passed to the
* methods of this annotation visitor are ignored. Moreover, exacly
* one visit method must be called on this annotation visitor,
* followed by visitEnd.
*/
AnnotationVisitor visitAnnotationDefault();
/**
* Visits an annotation of this method.
*
* @param desc the class descriptor of the annotation class.
* @param visible <tt>true</tt> if the annotation is visible at runtime.
* @return a non null visitor to visit the annotation values.
*/
AnnotationVisitor visitAnnotation(String desc, boolean visible);
/**
* Visits an annotation of a parameter this method.
*
* @param parameter the parameter index.
* @param desc the class descriptor of the annotation class.
* @param visible <tt>true</tt> if the annotation is visible at runtime.
* @return a non null visitor to visit the annotation values.
*/
AnnotationVisitor visitParameterAnnotation(
int parameter,
String desc,
boolean visible);
/**
* Visits a non standard attribute of this method.
*
* @param attr an attribute.
*/
void visitAttribute(Attribute attr);
/**
* Starts the visit of the method's code, if any (i.e. non abstract method).
*/
void visitCode();
// -------------------------------------------------------------------------
// Normal instructions
// -------------------------------------------------------------------------
/**
* Visits a zero operand instruction.
*
* @param opcode the opcode of the instruction to be visited. This opcode is
* either NOP, ACONST_NULL, ICONST_M1, ICONST_0, ICONST_1, ICONST_2,
* ICONST_3, ICONST_4, ICONST_5, LCONST_0, LCONST_1, FCONST_0,
* FCONST_1, FCONST_2, DCONST_0, DCONST_1, IALOAD, LALOAD, FALOAD,
* DALOAD, AALOAD, BALOAD, CALOAD, SALOAD, IASTORE, LASTORE, FASTORE,
* DASTORE, AASTORE, BASTORE, CASTORE, SASTORE, POP, POP2, DUP,
* DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, SWAP, IADD, LADD, FADD,
* DADD, ISUB, LSUB, FSUB, DSUB, IMUL, LMUL, FMUL, DMUL, IDIV, LDIV,
* FDIV, DDIV, IREM, LREM, FREM, DREM, INEG, LNEG, FNEG, DNEG, ISHL,
* LSHL, ISHR, LSHR, IUSHR, LUSHR, IAND, LAND, IOR, LOR, IXOR, LXOR,
* I2L, I2F, I2D, L2I, L2F, L2D, F2I, F2L, F2D, D2I, D2L, D2F, I2B,
* I2C, I2S, LCMP, FCMPL, FCMPG, DCMPL, DCMPG, IRETURN, LRETURN,
* FRETURN, DRETURN, ARETURN, RETURN, ARRAYLENGTH, ATHROW,
* MONITORENTER, or MONITOREXIT.
*/
void visitInsn(int opcode);
/**
* Visits an instruction with a single int operand.
*
* @param opcode the opcode of the instruction to be visited. This opcode is
* either BIPUSH, SIPUSH or NEWARRAY.
* @param operand the operand of the instruction to be visited.<br>
* When opcode is BIPUSH, operand value should be between
* Byte.MIN_VALUE and Byte.MAX_VALUE.<br>
* When opcode is SIPUSH, operand value should be between
* Short.MIN_VALUE and Short.MAX_VALUE.<br>
* When opcode is NEWARRAY, operand value should be one of
* {@link Opcodes#T_BOOLEAN}, {@link Opcodes#T_CHAR},
* {@link Opcodes#T_FLOAT}, {@link Opcodes#T_DOUBLE},
* {@link Opcodes#T_BYTE}, {@link Opcodes#T_SHORT},
* {@link Opcodes#T_INT} or {@link Opcodes#T_LONG}.
*/
void visitIntInsn(int opcode, int operand);
/**
* Visits a local variable instruction. A local variable instruction is an
* instruction that loads or stores the value of a local variable.
*
* @param opcode the opcode of the local variable instruction to be visited.
* This opcode is either ILOAD, LLOAD, FLOAD, DLOAD, ALOAD, ISTORE,
* LSTORE, FSTORE, DSTORE, ASTORE or RET.
* @param var the operand of the instruction to be visited. This operand is
* the index of a local variable.
*/
void visitVarInsn(int opcode, int var);
/**
* Visits a type instruction. A type instruction is an instruction that
* takes a type descriptor as parameter.
*
* @param opcode the opcode of the type instruction to be visited. This
* opcode is either NEW, ANEWARRAY, CHECKCAST or INSTANCEOF.
* @param desc the operand of the instruction to be visited. This operand is
* must be a fully qualified class name in internal form, or the type
* descriptor of an array type (see {@link Type Type}).
*/
void visitTypeInsn(int opcode, String desc);
/**
* Visits a field instruction. A field instruction is an instruction that
* loads or stores the value of a field of an object.
*
* @param opcode the opcode of the type instruction to be visited. This
* opcode is either GETSTATIC, PUTSTATIC, GETFIELD or PUTFIELD.
* @param owner the internal name of the field's owner class (see {@link
* Type#getInternalName() getInternalName}).
* @param name the field's name.
* @param desc the field's descriptor (see {@link Type Type}).
*/
void visitFieldInsn(int opcode, String owner, String name, String desc);
/**
* Visits a method instruction. A method instruction is an instruction that
* invokes a method.
*
* @param opcode the opcode of the type instruction to be visited. This
* opcode is either INVOKEVIRTUAL, INVOKESPECIAL, INVOKESTATIC or
* INVOKEINTERFACE.
* @param owner the internal name of the method's owner class (see {@link
* Type#getInternalName() getInternalName}).
* @param name the method's name.
* @param desc the method's descriptor (see {@link Type Type}).
*/
void visitMethodInsn(int opcode, String owner, String name, String desc);
/**
* Visits a jump instruction. A jump instruction is an instruction that may
* jump to another instruction.
*
* @param opcode the opcode of the type instruction to be visited. This
* opcode is either IFEQ, IFNE, IFLT, IFGE, IFGT, IFLE, IF_ICMPEQ,
* IF_ICMPNE, IF_ICMPLT, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ACMPEQ,
* IF_ACMPNE, GOTO, JSR, IFNULL or IFNONNULL.
* @param label the operand of the instruction to be visited. This operand
* is a label that designates the instruction to which the jump
* instruction may jump.
*/
void visitJumpInsn(int opcode, Label label);
/**
* Visits a label. A label designates the instruction that will be visited
* just after it.
*
* @param label a {@link Label Label} object.
*/
void visitLabel(Label label);
// -------------------------------------------------------------------------
// Special instructions
// -------------------------------------------------------------------------
/**
* Visits a LDC instruction.
*
* @param cst the constant to be loaded on the stack. This parameter must be
* a non null {@link Integer}, a {@link Float}, a {@link Long}, a
* {@link Double} a {@link String} (or a {@link Type} for
* <tt>.class</tt> constants, for classes whose version is 49.0 or
* more).
*/
void visitLdcInsn(Object cst);
/**
* Visits an IINC instruction.
*
* @param var index of the local variable to be incremented.
* @param increment amount to increment the local variable by.
*/
void visitIincInsn(int var, int increment);
/**
* Visits a TABLESWITCH instruction.
*
* @param min the minimum key value.
* @param max the maximum key value.
* @param dflt beginning of the default handler block.
* @param labels beginnings of the handler blocks. <tt>labels[i]</tt> is
* the beginning of the handler block for the <tt>min + i</tt> key.
*/
void visitTableSwitchInsn(int min, int max, Label dflt, Label labels[]);
/**
* Visits a LOOKUPSWITCH instruction.
*
* @param dflt beginning of the default handler block.
* @param keys the values of the keys.
* @param labels beginnings of the handler blocks. <tt>labels[i]</tt> is
* the beginning of the handler block for the <tt>keys[i]</tt> key.
*/
void visitLookupSwitchInsn(Label dflt, int keys[], Label labels[]);
/**
* Visits a MULTIANEWARRAY instruction.
*
* @param desc an array type descriptor (see {@link Type Type}).
* @param dims number of dimensions of the array to allocate.
*/
void visitMultiANewArrayInsn(String desc, int dims);
// -------------------------------------------------------------------------
// Exceptions table entries, debug information,
// max stack size and max locals
// -------------------------------------------------------------------------
/**
* Visits a try catch block.
*
* @param start beginning of the exception handler's scope (inclusive).
* @param end end of the exception handler's scope (exclusive).
* @param handler beginning of the exception handler's code.
* @param type internal name of the type of exceptions handled by the
* handler, or <tt>null</tt> to catch any exceptions (for "finally"
* blocks).
*/
void visitTryCatchBlock(Label start, Label end, Label handler, String type);
/**
* Visits a local variable declaration.
*
* @param name the name of a local variable.
* @param desc the type descriptor of this local variable.
* @param signature the type signature of this local variable. May be
* <tt>null</tt> if the local variable type does not use generic
* types.
* @param start the first instruction corresponding to the scope of this
* local variable (inclusive).
* @param end the last instruction corresponding to the scope of this local
* variable (exclusive).
* @param index the local variable's index.
* @throws IllegalArgumentException if one of the labels has not already
* been visited by this visitor (by the
* {@link #visitLabel visitLabel} method).
*/
void visitLocalVariable(
String name,
String desc,
String signature,
Label start,
Label end,
int index);
/**
* Visits a line number declaration.
*
* @param line a line number. This number refers to the source file from
* which the class was compiled.
* @param start the first instruction corresponding to this line number.
* @throws IllegalArgumentException if <tt>start</tt> has not already been
* visited by this visitor (by the {@link #visitLabel visitLabel}
* method).
*/
void visitLineNumber(int line, Label start);
/**
* Visits the maximum stack size and the maximum number of local variables
* of the method.
*
* @param maxStack maximum stack size of the method.
* @param maxLocals maximum number of local variables for the method.
*/
void visitMaxs(int maxStack, int maxLocals);
/**
* Visits the end of the method. This method, which is the last one to be
* called, is used to inform the visitor that all the annotations and
* attributes of the method have been visited.
*/
void visitEnd();
}