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101 lines
3.6 KiB
Python
Executable file
101 lines
3.6 KiB
Python
Executable file
#! /usr/bin/env python
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# Copyright 2024 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import sys
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import struct
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ROCKY_HEADER_SIZE = 8
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ROCKY_HEADER_FMT = "4sB3x"
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JERRY_HEADER_SIZE = 16
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JERRY_HEADER_FMT = "<4I"
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LIT_TABLE_HEADER_SIZE = 8
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LIT_TABLE_HEADER_FMT = "<2I"
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LIT_STRING_HEADER_SIZE = 2
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LIT_STRING_HEADER_FMT = "<H"
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def _get_aligned_literal_length(length):
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LITERAL_ALIGNMENT = (1 << 2)
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return ((length) + (LITERAL_ALIGNMENT - 1)) & ~(LITERAL_ALIGNMENT - 1)
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def main(snapshot_path):
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with open(snapshot_path, 'rb') as fin:
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# TODO: This should be generalized to a prefix string, not a Rocky header
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rocky_header = struct.unpack(ROCKY_HEADER_FMT, fin.read(ROCKY_HEADER_SIZE))
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print "Rocky Header"
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print " Signature: {}".format(rocky_header[0])
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print " Version: 0x{:02x}".format(rocky_header[1])
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print
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jerry_header = struct.unpack(JERRY_HEADER_FMT, fin.read(JERRY_HEADER_SIZE))
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print "Jerry Header"
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print " Version: {}".format(jerry_header[0])
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print " lit_table_offset: {}".format(jerry_header[1])
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print " lit_table_size: {}".format(jerry_header[2])
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print " is_run_global: {}".format(jerry_header[3])
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print
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fin.seek(jerry_header[1] + ROCKY_HEADER_SIZE, 0) # position to beginning of literal table
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lit_header = struct.unpack(LIT_TABLE_HEADER_FMT, fin.read(LIT_TABLE_HEADER_SIZE))
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lit_string_count = lit_header[0]
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lit_number_count = lit_header[1]
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print "Literal Header"
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print " String Count: {}".format(lit_string_count)
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print " Number Count: {}".format(lit_number_count)
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print
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# Now dump the literal tables
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offset = 0
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for i in xrange(lit_string_count):
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length = struct.unpack(LIT_STRING_HEADER_FMT, fin.read(LIT_STRING_HEADER_SIZE))[0]
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aligned_length = _get_aligned_literal_length(2 + length)
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s = struct.unpack("{}s".format(length), fin.read(length))[0]
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print "0x{:08x}: String: '{}'".format(offset, s)
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move = aligned_length - length - 2 # - 2 since the header was already read
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if move > 0:
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fin.seek(move, 1)
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offset += aligned_length
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remaining_length = jerry_header[2] - offset - LIT_TABLE_HEADER_SIZE
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number_length = remaining_length / float(lit_number_count)
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if not number_length.is_integer():
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print "Invalid offset for start of number literals"
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return 1
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number_length = int(number_length)
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for i in xrange(lit_number_count):
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length = number_length
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aligned_length = _get_aligned_literal_length(length)
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n = struct.unpack("d" if length == 8 else "f", fin.read(length))[0]
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print "0x{:08x}: Number: {}".format(offset, n)
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move = aligned_length - length
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if move > 0:
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fin.seek(move, 1)
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offset += aligned_length
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print "Numbers are {}-bit".format(number_length * 8)
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return 0
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if __name__ == "__main__":
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rc = main(sys.argv[1])
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sys.exit(rc)
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