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88217ec276
Every constant is certainly 4 bytes now, but freebsd's objdump utility prints out odd byte sequences (5-bytes, 6-bytes and even 9-bytes long) for v8's data section. We can safely ignore all upper bytes, because all constants that we're using are just `int`s. Since on all supported platforms `int` is 32bit long (and anyway v8's constants are 32bit too), we ignore all higher bits if they were read.
115 lines
2.7 KiB
Python
Executable File
115 lines
2.7 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# genv8constants.py output_file libv8_base.a
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#
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# Emits v8dbg constants stored in libv8_base.a in a format suitable for the V8
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# ustack helper.
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#
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import re
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import subprocess
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import sys
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import errno
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if len(sys.argv) != 3:
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print "usage: objsym.py outfile libv8_base.a"
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sys.exit(2);
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outfile = file(sys.argv[1], 'w');
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try:
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pipe = subprocess.Popen([ 'objdump', '-z', '-D', sys.argv[2] ],
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bufsize=-1, stdout=subprocess.PIPE).stdout;
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except OSError, e:
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if e.errno == errno.ENOENT:
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print '''
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Node.js compile error: could not find objdump
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Check that GNU binutils are installed and included in PATH
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'''
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else:
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print 'problem running objdump: ', e.strerror
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sys.exit()
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pattern = re.compile('([0-9a-fA-F]{8}|[0-9a-fA-F]{16}) <(.*)>:');
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v8dbg = re.compile('^v8dbg.*$')
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numpattern = re.compile('^[0-9a-fA-F]{2} $');
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octets = 4
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outfile.write("""
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/*
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* File automatically generated by genv8constants. Do not edit.
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*
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* The following offsets are dynamically from libv8_base.a. See src/v8ustack.d
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* for details on how these values are used.
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*/
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#ifndef V8_CONSTANTS_H
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#define V8_CONSTANTS_H
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""");
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curr_sym = None;
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curr_val = 0;
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curr_octet = 0;
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def out_reset():
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global curr_sym, curr_val, curr_octet
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curr_sym = None;
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curr_val = 0;
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curr_octet = 0;
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def out_define():
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global curr_sym, curr_val, curr_octet, outfile, octets
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if curr_sym != None:
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wrapped_val = curr_val & 0xffffffff;
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if curr_val & 0x80000000 != 0:
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wrapped_val = 0x100000000 - wrapped_val;
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outfile.write("#define %s -0x%x\n" % (curr_sym.upper(), wrapped_val));
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else:
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outfile.write("#define %s 0x%x\n" % (curr_sym.upper(), wrapped_val));
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out_reset();
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for line in pipe:
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if curr_sym != None:
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#
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# This bit of code has nasty knowledge of the objdump text output
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# format, but this is the most obvious robust approach. We could almost
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# rely on looking at numbered fields, but some instructions look very
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# much like hex numbers (e.g., "adc"), and we don't want to risk picking
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# those up by mistake, so we look at character-based columns intead.
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#
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for i in range (0, 3):
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# 6-character margin, 2-characters + 1 space for each field
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idx = 6 + i * 3;
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octetstr = line[idx:idx+3]
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if not numpattern.match(octetstr):
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break;
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if curr_octet > octets:
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break;
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curr_val += int('0x%s' % octetstr, 16) << (curr_octet * 8);
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curr_octet += 1;
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match = pattern.match(line)
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if match == None:
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continue;
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# Print previous symbol
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out_define();
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v8match = v8dbg.match(match.group(2));
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if v8match != None:
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out_reset();
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curr_sym = match.group(2);
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# Print last symbol
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out_define();
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outfile.write("""
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#endif /* V8_CONSTANTS_H */
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""");
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