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154 lines
4.2 KiB
154 lines
4.2 KiB
# Copyright 2011 the V8 project authors. All rights reserved.
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided
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# with the distribution.
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# * Neither the name of Google Inc. nor the names of its
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# contributors may be used to endorse or promote products derived
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# from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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kSmiTag = 0
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kSmiTagSize = 1
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kSmiTagMask = (1 << kSmiTagSize) - 1
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kHeapObjectTag = 1
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kHeapObjectTagSize = 2
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kHeapObjectTagMask = (1 << kHeapObjectTagSize) - 1
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kFailureTag = 3
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kFailureTagSize = 2
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kFailureTagMask = (1 << kFailureTagSize) - 1
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kSmiShiftSize32 = 0
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kSmiValueSize32 = 31
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kSmiShiftBits32 = kSmiTagSize + kSmiShiftSize32
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kSmiShiftSize64 = 31
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kSmiValueSize64 = 32
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kSmiShiftBits64 = kSmiTagSize + kSmiShiftSize64
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kAllBits = 0xFFFFFFFF
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kTopBit32 = 0x80000000
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kTopBit64 = 0x8000000000000000
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t_u32 = gdb.lookup_type('unsigned int')
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t_u64 = gdb.lookup_type('unsigned long long')
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def has_smi_tag(v):
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return v & kSmiTagMask == kSmiTag
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def has_failure_tag(v):
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return v & kFailureTagMask == kFailureTag
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def has_heap_object_tag(v):
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return v & kHeapObjectTagMask == kHeapObjectTag
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def raw_heap_object(v):
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return v - kHeapObjectTag
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def smi_to_int_32(v):
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v = v & kAllBits
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if (v & kTopBit32) == kTopBit32:
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return ((v & kAllBits) >> kSmiShiftBits32) - 2147483648
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else:
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return (v & kAllBits) >> kSmiShiftBits32
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def smi_to_int_64(v):
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return (v >> kSmiShiftBits64)
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def decode_v8_value(v, bitness):
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base_str = 'v8[%x]' % v
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if has_smi_tag(v):
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if bitness == 32:
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return base_str + (" SMI(%d)" % smi_to_int_32(v))
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else:
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return base_str + (" SMI(%d)" % smi_to_int_64(v))
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elif has_failure_tag(v):
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return base_str + " (failure)"
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elif has_heap_object_tag(v):
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return base_str + (" H(0x%x)" % raw_heap_object(v))
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else:
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return base_str
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class V8ValuePrinter(object):
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"Print a v8value."
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def __init__(self, val):
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self.val = val
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def to_string(self):
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if self.val.type.sizeof == 4:
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v_u32 = self.val.cast(t_u32)
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return decode_v8_value(int(v_u32), 32)
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elif self.val.type.sizeof == 8:
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v_u64 = self.val.cast(t_u64)
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return decode_v8_value(int(v_u64), 64)
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else:
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return 'v8value?'
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def display_hint(self):
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return 'v8value'
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def v8_pretty_printers(val):
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lookup_tag = val.type.tag
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if lookup_tag == None:
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return None
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elif lookup_tag == 'v8value':
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return V8ValuePrinter(val)
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return None
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gdb.pretty_printers.append(v8_pretty_printers)
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def v8_to_int(v):
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if v.type.sizeof == 4:
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return int(v.cast(t_u32))
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elif v.type.sizeof == 8:
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return int(v.cast(t_u64))
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else:
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return '?'
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def v8_get_value(vstring):
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v = gdb.parse_and_eval(vstring)
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return v8_to_int(v)
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class V8PrintObject (gdb.Command):
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"""Prints a v8 object."""
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def __init__ (self):
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super (V8PrintObject, self).__init__ ("v8print", gdb.COMMAND_DATA)
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def invoke (self, arg, from_tty):
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v = v8_get_value(arg)
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gdb.execute('call __gdb_print_v8_object(%d)' % v)
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V8PrintObject()
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