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d8c97e4857
PR-URL: https://github.com/nodejs/node/pull/50115 Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Michael Dawson <midawson@redhat.com>
108 lines
2.7 KiB
Python
108 lines
2.7 KiB
Python
#!/usr/bin/env python3
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# Copyright 2023 the V8 project authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can
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# be found in the LICENSE file.
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import base64
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import sys
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script_id_to_name = {}
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script_id_to_start_positions = {}
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def varint(n):
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orig_mask = (1 << 7) - 1
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mask = (1 << 7) - 1
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res = []
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shift = 0
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while n > mask:
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mask = mask << 7
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shift += 7
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while mask > orig_mask:
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# This byte will start with 1
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res.append((1 << 7) | ((n & mask) >> shift))
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mask = mask >> 7
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shift -= 7
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assert (mask == orig_mask)
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# This byte will start with 0
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res.append(n & orig_mask)
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return res
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def encode_delta_varint_base64(start_positions):
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bytes = []
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prev_pos = 0
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for p in start_positions:
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bytes.extend(varint(p - prev_pos))
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prev_pos = p
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return base64.b64encode(bytearray(bytes)).decode()
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def decode_varints(bytes):
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ints = []
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current = 0
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for b in bytes:
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if b & (1 << 7):
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# Not the last byte
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current = (current << 7) | (b & ((1 << 7) - 1))
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else:
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# The last byte
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current = (current << 7) | b
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ints.append(current)
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current = 0
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return ints
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def decode_delta_varint_base64(comment):
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bytes = base64.b64decode(comment)
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deltas = decode_varints(bytes)
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prev_pos = 0
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positions = []
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for d in deltas:
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prev_pos += d
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positions.append(prev_pos)
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return positions
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if len(sys.argv) < 2 or '--help' in sys.argv:
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print('Usage: python3 generate-explicit-function-compile-hints.py v8.log')
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exit(1)
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with open(sys.argv[1], 'r') as log_file:
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for line in log_file:
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fields = line.strip().split(',')
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if len(fields) >= 3:
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if fields[0] == 'script-details':
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script_id = int(fields[1])
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script_name = fields[2]
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script_id_to_name[script_id] = script_name
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elif fields[0] == 'function' and fields[1] == 'parse-function':
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script_id = int(fields[2])
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start_position = int(fields[3])
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if script_id in script_id_to_start_positions:
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script_id_to_start_positions[script_id].add(start_position)
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else:
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script_id_to_start_positions[script_id] = {start_position}
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for script_id, script_name in script_id_to_name.items():
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if script_id in script_id_to_start_positions:
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if not script_name.startswith('http') and not script_name.startswith(
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'file'):
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continue
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start_positions = list(script_id_to_start_positions[script_id])
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start_positions.sort()
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print(script_name)
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magic_comment = encode_delta_varint_base64(start_positions)
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back = decode_delta_varint_base64(magic_comment)
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if start_positions != back:
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print('Decoding failed!')
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exit(1)
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print(f"//# experimentalChromiumCompileHintsData={magic_comment}\n")
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