mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-11-04 05:17:07 +00:00
92a3e9d63a
It doesn't currently support the op info and symbol lookup callbacks, but it is better than nothing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152527 91177308-0d34-0410-b5e6-96231b3b80d8
135 lines
4.5 KiB
Python
135 lines
4.5 KiB
Python
#===- disassembler.py - Python LLVM Bindings -----------------*- python -*--===#
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#
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# The LLVM Compiler Infrastructure
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#
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# This file is distributed under the University of Illinois Open Source
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# License. See LICENSE.TXT for details.
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#
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#===------------------------------------------------------------------------===#
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from ctypes import CFUNCTYPE
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from ctypes import POINTER
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from ctypes import addressof
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from ctypes import byref
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from ctypes import c_byte
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from ctypes import c_char_p
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from ctypes import c_int
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from ctypes import c_size_t
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from ctypes import c_ubyte
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from ctypes import c_uint64
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from ctypes import c_void_p
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from ctypes import cast
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from .common import LLVMObject
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from .common import c_object_p
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from .common import get_library
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__all__ = [
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'Disassembler',
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]
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lib = get_library()
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callbacks = {}
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class Disassembler(LLVMObject):
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"""Represents a disassembler instance.
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Disassembler instances are tied to specific "triple," which must be defined
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at creation time.
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Disassembler instances can disassemble instructions from multiple sources.
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"""
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def __init__(self, triple):
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"""Create a new disassembler instance.
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The triple argument is the triple to create the disassembler for. This
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is something like 'i386-apple-darwin9'.
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"""
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ptr = lib.LLVMCreateDisasm(c_char_p(triple), c_void_p(None), c_int(0),
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callbacks['op_info'](0), callbacks['symbol_lookup'](0))
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if not ptr.contents:
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raise Exception('Could not obtain disassembler for triple: %s' %
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triple)
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LLVMObject.__init__(self, ptr, disposer=lib.LLVMDisasmDispose)
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def get_instruction(self, source, pc=0):
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"""Obtain the next instruction from an input source.
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The input source should be a str or bytearray or something that
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represents a sequence of bytes.
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This function will start reading bytes from the beginning of the
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source.
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The pc argument specifies the address that the first byte is at.
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This returns a 2-tuple of:
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long number of bytes read. 0 if no instruction was read.
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str representation of instruction. This will be the assembly that
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represents the instruction.
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"""
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buf = cast(c_char_p(source), POINTER(c_ubyte))
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out_str = cast((c_byte * 255)(), c_char_p)
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result = lib.LLVMDisasmInstruction(self, buf, c_uint64(len(source)),
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c_uint64(pc), out_str, 255)
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return (result, out_str.value)
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def get_instructions(self, source, pc=0):
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"""Obtain multiple instructions from an input source.
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This is like get_instruction() except it is a generator for all
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instructions within the source. It starts at the beginning of the
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source and reads instructions until no more can be read.
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This generator returns 3-tuple of:
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long address of instruction.
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long size of instruction, in bytes.
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str representation of instruction.
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"""
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source_bytes = c_char_p(source)
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out_str = cast((c_byte * 255)(), c_char_p)
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# This could probably be written cleaner. But, it does work.
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buf = cast(source_bytes, POINTER(c_ubyte * len(source))).contents
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offset = 0
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address = pc
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end_address = pc + len(source)
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while address < end_address:
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b = cast(addressof(buf) + offset, POINTER(c_ubyte))
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result = lib.LLVMDisasmInstruction(self, b,
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c_uint64(len(source) - offset), c_uint64(address),
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out_str, 255)
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if result == 0:
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break
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yield (address, result, out_str.value)
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address += result
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offset += result
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def register_library(library):
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library.LLVMCreateDisasm.argtypes = [c_char_p, c_void_p, c_int,
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callbacks['op_info'], callbacks['symbol_lookup']]
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library.LLVMCreateDisasm.restype = c_object_p
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library.LLVMDisasmDispose.argtypes = [Disassembler]
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library.LLVMDisasmInstruction.argtypes = [Disassembler, POINTER(c_ubyte),
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c_uint64, c_uint64, c_char_p, c_size_t]
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library.LLVMDisasmInstruction.restype = c_size_t
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callbacks['op_info'] = CFUNCTYPE(c_int, c_void_p, c_uint64, c_uint64, c_uint64,
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c_int, c_void_p)
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callbacks['symbol_lookup'] = CFUNCTYPE(c_char_p, c_void_p, c_uint64,
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POINTER(c_uint64), c_uint64,
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POINTER(c_char_p))
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register_library(lib)
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