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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2011, Joyent, Inc. All rights reserved.
*/
/*
* v8dbg.h: macros for use by V8 heap inspection tools. The consumer must
* define values for various tags and shifts. The MDB module gets these
* constants from information encoded in the binary itself.
*/
#ifndef _V8DBG_H
#define _V8DBG_H
/*
* Recall that while V8 heap objects are always 4-byte aligned, heap object
* pointers always have the last bit set. So when looking for a field nominally
* at offset X, one must be sure to clear the tag bit first.
*/
#define V8_OFF_HEAP(x) ((x) - V8_HeapObjectTag)
/*
* Determine whether a given pointer refers to a SMI, Failure, or HeapObject.
*/
#define V8_IS_SMI(ptr) (((ptr) & V8_SmiTagMask) == V8_SmiTag)
#define V8_IS_FAILURE(ptr) (((ptr) & V8_FailureTagMask) == V8_FailureTag)
#define V8_IS_HEAPOBJECT(ptr) \
(((ptr) & V8_HeapObjectTagMask) == V8_HeapObjectTag)
/*
* Extract the value of a SMI "pointer". Recall that small integers are stored
* using the upper 31 bits.
*/
#define V8_SMI_VALUE(smi) ((smi) >> V8_SmiValueShift)
/*
* Determine the encoding and representation of a V8 string.
*/
#define V8_TYPE_STRING(type) (((type) & V8_IsNotStringMask) == V8_StringTag)
#define V8_STRENC_ASCII(type) \
(((type) & V8_StringEncodingMask) == V8_AsciiStringTag)
#define V8_STRREP_SEQ(type) \
(((type) & V8_StringRepresentationMask) == V8_SeqStringTag)
#define V8_STRREP_CONS(type) \
(((type) & V8_StringRepresentationMask) == V8_ConsStringTag)
#define V8_STRREP_EXT(type) \
(((type) & V8_StringRepresentationMask) == V8_ExternalStringTag)
/*
* Several of the following constants and transformations are hardcoded in V8 as
* well, so there's no way to extract them programmatically from the binary.
*/
#define V8_DESC_KEYIDX(x) ((x) + V8_PROP_IDX_FIRST)
#define V8_DESC_VALIDX(x) ((x) << 1)
#define V8_DESC_DETIDX(x) (((x) << 1) + 1)
#define V8_DESC_ISFIELD(x) \
(V8_SMI_VALUE((x) & V8_PROP_TYPE_MASK) == V8_PROP_TYPE_FIELD)
#endif /* _V8DBG_H */
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