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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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/*
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* v8dbg.h: macros for use by V8 heap inspection tools. The consumer must
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* define values for various tags and shifts. The MDB module gets these
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* constants from information encoded in the binary itself.
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*/
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#ifndef _V8DBG_H
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#define _V8DBG_H
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/*
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* Recall that while V8 heap objects are always 4-byte aligned, heap object
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* pointers always have the last bit set. So when looking for a field nominally
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* at offset X, one must be sure to clear the tag bit first.
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*/
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#define V8_OFF_HEAP(x) ((x) - V8_HeapObjectTag)
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/*
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* Determine whether a given pointer refers to a SMI, Failure, or HeapObject.
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*/
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#define V8_IS_SMI(ptr) (((ptr) & V8_SmiTagMask) == V8_SmiTag)
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#define V8_IS_FAILURE(ptr) (((ptr) & V8_FailureTagMask) == V8_FailureTag)
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#define V8_IS_HEAPOBJECT(ptr) \
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(((ptr) & V8_HeapObjectTagMask) == V8_HeapObjectTag)
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/*
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* Extract the value of a SMI "pointer". Recall that small integers are stored
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* using the upper 31 bits.
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*/
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#define V8_SMI_VALUE(smi) ((smi) >> (V8_SmiValueShift + V8_SmiShiftSize))
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/*
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* Determine the encoding and representation of a V8 string.
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*/
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#define V8_TYPE_STRING(type) (((type) & V8_IsNotStringMask) == V8_StringTag)
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#define V8_STRENC_ASCII(type) \
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(((type) & V8_StringEncodingMask) == V8_AsciiStringTag)
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#define V8_STRREP_SEQ(type) \
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(((type) & V8_StringRepresentationMask) == V8_SeqStringTag)
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#define V8_STRREP_CONS(type) \
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(((type) & V8_StringRepresentationMask) == V8_ConsStringTag)
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#define V8_STRREP_SLICED(type) \
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(((type) & V8_StringRepresentationMask) == V8_SlicedStringTag)
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#define V8_STRREP_EXT(type) \
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(((type) & V8_StringRepresentationMask) == V8_ExternalStringTag)
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/*
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* Several of the following constants and transformations are hardcoded in V8 as
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* well, so there's no way to extract them programmatically from the binary.
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*/
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#define V8_DESC_KEYIDX(x) ((x) + V8_PROP_IDX_FIRST)
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#define V8_DESC_VALIDX(x) ((x) << 1)
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#define V8_DESC_DETIDX(x) (((x) << 1) + 1)
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#define V8_DESC_ISFIELD(x) \
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((V8_SMI_VALUE(x) & V8_PROP_TYPE_MASK) == V8_PROP_TYPE_FIELD)
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#endif /* _V8DBG_H */
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