Code Disassembly
Functions for code disassembly.
Credits
Information for the instructions was obtained from
The length of the operands is unpredictable.
Operand types.
@OP_TYPE_NONE: No operand.
@OP_TYPE_BYTE: The operand is a signed byte.
@OP_TYPE_UNSIGNED_BYTE: The operand is an unsigned byte.
@OP_TYPE_BYTE_ARRAY_TYPE: The operand is an unsigned byte representing a
primitive array type. Possible values are listed in the ArrayType enum.
You can also use the jclass_code_array_name() function to get a string with
the name.
@OP_TYPE_BYTE_CONSTANT_INDEX: The operand is an unsigned byte index in the constant
pool for a constant.
@OP_TYPE_UNSIGNED_BYTE_USELESS: The operand is an unsigned byte which is useless.
See the documentation for the invokeinterface instruction to see what I mean.
@OP_TYPE_SHORT: The operand is a signed short integer.
@OP_TYPE_UNSIGNED_SHORT: The operand is an unsigned short integer.
@OP_TYPE_SHORT_OFFSET: The operand is a short offset from the pc of the instruction.
@OP_TYPE_SHORT_CLASS_INDEX: The operand is a short integer which is the index
of a class in the constant pool.
@OP_TYPE_SHORT_METHOD_INDEX: The operand is a short integer which is the index
of a method in the constant pool.
@OP_TYPE_SHORT_FIELD_INDEX: The operand is a short integer which is the index
of a field in the constant pool.
@OP_TYPE_SHORT_CONSTANT_INDEX: The operand is a short integer which is the
index of a constant in the constant pool.
@OP_TYPE_INT: The operand is a 32-bit signed integer.
@OP_TYPE_INT_OFFSET: The operand is a signed integer offset from the pc of th instruction.
@OP_TYPE_INSTRUCTION: The operand is an instruction (See wide instruction).
@OP_TYPE_TABLESWITCH: The operand is a tableswitch.
It is always aligned at a 4-byte boundary.
The "page" or whatever you want to call it starts at the first byte of the code.
@OP_TYPE_LOOKUPSWITCH: The operand is a lookupswitch.
It is always aligned at a 4-byte boundary.
@OP_TYPE_ERROR: Some kind of error occured.
Primitive array type values. This enumeration is used in the newarray instruction
to indicate the type of the primitive array. The operand is OP_TYPE_BYTE_ARRAY_TYPE.
@ARRAY_TYPE_BOOLEAN: boolean array.
@ARRAY_TYPE_CHAR: char array.
@ARRAY_TYPE_FLOAT: float array.
@ARRAY_TYPE_DOUBLE: double array.
@ARRAY_TYPE_BYTE: byte array.
@ARRAY_TYPE_SHORT: short array.
@ARRAY_TYPE_INT: int array.
@ARRAY_TYPE_LONG: long array.
Operand for the tableswitch instruction.
@num_pairs:
@default_target:
@low_value:
@target:
Operand for the lookupswitch instruction.
@num_pairs:
@default_target:
@value:
@target:
The maximum legal opcode for an instruction.
@opcode:
@Returns:
@opcode:
@Returns:
@opcode:
@Returns:
@opcode:
@operand_number:
@is_wide:
@Returns:
@code:
@pc:
@Returns:
@code:
@pc:
@Returns:
@code:
@pc:
@Returns:
@code:
@pc:
@Returns:
@code:
@pc:
@Returns:
@code:
@pc:
@Returns:
@code:
@pc:
@Returns:
@operand:
@operand:
Aligns the PC at a 4-byte boundary.
Useful for tableswitch and lookupswitch.
Read a tableswitch operand
code, &pc);
/* low */
low = jclass_code_read_int(code->code, &pc);
/* high */
high = jclass_code_read_int(code->code, &pc);
/* store the targets in an array */
target = (uint32*) malloc(sizeof(uint32) * ((high - low) + 1));
for(count = 0; count < (high - low) + 1; count++)
target[count] = instruction_pc + jclass_code_read_int(code->code, &pc);
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@pc: The current pc.
@array_number:
@Returns: