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      1 #!/usr/bin/env python
      2 #
      3 # Copyright 2011 the V8 project authors. All rights reserved.
      4 # Redistribution and use in source and binary forms, with or without
      5 # modification, are permitted provided that the following conditions are
      6 # met:
      7 #
      8 #     * Redistributions of source code must retain the above copyright
      9 #       notice, this list of conditions and the following disclaimer.
     10 #     * Redistributions in binary form must reproduce the above
     11 #       copyright notice, this list of conditions and the following
     12 #       disclaimer in the documentation and/or other materials provided
     13 #       with the distribution.
     14 #     * Neither the name of Google Inc. nor the names of its
     15 #       contributors may be used to endorse or promote products derived
     16 #       from this software without specific prior written permission.
     17 #
     18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29 
     30 import os
     31 import re
     32 import subprocess
     33 import tempfile
     34 
     35 
     36 # Avoid using the slow (google-specific) wrapper around objdump.
     37 OBJDUMP_BIN = "/usr/bin/objdump"
     38 if not os.path.exists(OBJDUMP_BIN):
     39   OBJDUMP_BIN = "objdump"
     40 
     41 
     42 _COMMON_DISASM_OPTIONS = ["-M", "intel-mnemonic", "-C"]
     43 
     44 _DISASM_HEADER_RE = re.compile(r"[a-f0-9]+\s+<.*:$")
     45 _DISASM_LINE_RE = re.compile(r"\s*([a-f0-9]+):\s*(\S.*)")
     46 
     47 # Keys must match constants in Logger::LogCodeInfo.
     48 _ARCH_MAP = {
     49   "ia32": "-m i386",
     50   "x64": "-m i386 -M x86-64",
     51   "arm": "-m arm",  # Not supported by our objdump build.
     52   "mips": "-m mips"  # Not supported by our objdump build.
     53 }
     54 
     55 
     56 def GetDisasmLines(filename, offset, size, arch, inplace, arch_flags=""):
     57   tmp_name = None
     58   if not inplace:
     59     # Create a temporary file containing a copy of the code.
     60     assert arch in _ARCH_MAP, "Unsupported architecture '%s'" % arch
     61     arch_flags = arch_flags + " " +  _ARCH_MAP[arch]
     62     tmp_name = tempfile.mktemp(".v8code")
     63     command = "dd if=%s of=%s bs=1 count=%d skip=%d && " \
     64               "%s %s -D -b binary %s %s" % (
     65       filename, tmp_name, size, offset,
     66       OBJDUMP_BIN, ' '.join(_COMMON_DISASM_OPTIONS), arch_flags,
     67       tmp_name)
     68   else:
     69     command = "%s %s %s --start-address=%d --stop-address=%d -d %s " % (
     70       OBJDUMP_BIN, ' '.join(_COMMON_DISASM_OPTIONS), arch_flags,
     71       offset,
     72       offset + size,
     73       filename)
     74   process = subprocess.Popen(command,
     75                              shell=True,
     76                              stdout=subprocess.PIPE,
     77                              stderr=subprocess.STDOUT)
     78   out, err = process.communicate()
     79   lines = out.split("\n")
     80   header_line = 0
     81   for i, line in enumerate(lines):
     82     if _DISASM_HEADER_RE.match(line):
     83       header_line = i
     84       break
     85   if tmp_name:
     86     os.unlink(tmp_name)
     87   split_lines = []
     88   for line in lines[header_line + 1:]:
     89     match = _DISASM_LINE_RE.match(line)
     90     if match:
     91       line_address = int(match.group(1), 16)
     92       split_lines.append((line_address, match.group(2)))
     93   return split_lines
     94