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82 lines
2.0 KiB
82 lines
2.0 KiB
#!/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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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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pipe = subprocess.Popen([ 'objdump', '-z', '-D', sys.argv[2] ],
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bufsize=-1, stdout=subprocess.PIPE).stdout;
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pattern = re.compile('00000000 <(v8dbg_.*)>:');
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numpattern = re.compile('[0-9a-fA-F]{2}');
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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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#if defined(__i386)
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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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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+2]
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if not numpattern.match(octetstr):
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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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if curr_octet < 4:
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continue;
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outfile.write("#define %s 0x%x\n" % (curr_sym.upper(), curr_val));
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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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continue;
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match = pattern.match(line)
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if match == None:
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continue;
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curr_sym = match.group(1);
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outfile.write("""
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#else
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#error "only i386 is supported for DTrace ustack helper"
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#endif
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#endif /* V8_CONSTANTS_H */
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""");
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