+++ /dev/null
-/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- */
-
-/*
- * mdb(1M) module for debugging the V8 JavaScript engine. This implementation
- * makes heavy use of metadata defined in the V8 binary for inspecting in-memory
- * structures. Canned configurations can be manually loaded for V8 binaries
- * that predate this metadata. See mdb_v8_cfg.c for details.
- *
- * NOTE: This dmod implementation (including this file and related headers and C
- * files) exist in both the Node and illumos source trees. THESE SHOULD BE KEPT
- * IN SYNC. The version in the Node tree is built directly into modern Node
- * binaries as part of the build process, and the version in the illumos source
- * tree is delivered with the OS for debugging Node binaries that predate
- * support for including the dmod directly in the binary. Note too that these
- * files have different licenses to match their corresponding repositories.
- */
-
-/*
- * We hard-code our MDB_API_VERSION to be 3 to allow this module to be
- * compiled on systems with higher version numbers, but still allow the
- * resulting binary object to be used on older systems. (We do not make use
- * of functionality present in versions later than 3.) This is particularly
- * important for mdb_v8 because (1) it's used in particular to debug
- * application-level software and (2) it has a history of rapid evolution.
- */
-#define MDB_API_VERSION 3
-
-#include <sys/mdb_modapi.h>
-#include <assert.h>
-#include <ctype.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <string.h>
-#include <libproc.h>
-#include <sys/avl.h>
-#include <alloca.h>
-
-#include "v8dbg.h"
-#include "v8cfg.h"
-
-#define offsetof(s, m) ((size_t)(&(((s *)0)->m)))
-
-/*
- * The "v8_class" and "v8_field" structures describe the C++ classes used to
- * represent V8 heap objects.
- */
-typedef struct v8_class {
- struct v8_class *v8c_next; /* list linkage */
- struct v8_class *v8c_parent; /* parent class (inheritance) */
- struct v8_field *v8c_fields; /* array of class fields */
- size_t v8c_start; /* offset of first class field */
- size_t v8c_end; /* offset of first subclass field */
- char v8c_name[64]; /* heap object class name */
-} v8_class_t;
-
-typedef struct v8_field {
- struct v8_field *v8f_next; /* list linkage */
- ssize_t v8f_offset; /* field offset */
- char v8f_name[64]; /* field name */
- boolean_t v8f_isbyte; /* 1-byte int field */
- boolean_t v8f_isstr; /* NUL-terminated string */
-} v8_field_t;
-
-/*
- * Similarly, the "v8_enum" structure describes an enum from V8.
- */
-typedef struct {
- char v8e_name[64];
- uint_t v8e_value;
-} v8_enum_t;
-
-/*
- * During configuration, the dmod updates these globals with the actual set of
- * classes, types, and frame types based on the debug metadata.
- */
-static v8_class_t *v8_classes;
-
-static v8_enum_t v8_types[128];
-static int v8_next_type;
-
-static v8_enum_t v8_frametypes[16];
-static int v8_next_frametype;
-
-static int v8_warnings;
-static int v8_silent;
-
-/*
- * The following constants describe offsets from the frame pointer that are used
- * to inspect each stack frame. They're initialized from the debug metadata.
- */
-static ssize_t V8_OFF_FP_CONTEXT;
-static ssize_t V8_OFF_FP_MARKER;
-static ssize_t V8_OFF_FP_FUNCTION;
-static ssize_t V8_OFF_FP_ARGS;
-
-/*
- * The following constants are used by macros defined in heap-dbg-common.h to
- * examine the types of various V8 heap objects. In general, the macros should
- * be preferred to using the constants directly. The values of these constants
- * are initialized from the debug metadata.
- */
-static intptr_t V8_FirstNonstringType;
-static intptr_t V8_IsNotStringMask;
-static intptr_t V8_StringTag;
-static intptr_t V8_NotStringTag;
-static intptr_t V8_StringEncodingMask;
-static intptr_t V8_TwoByteStringTag;
-static intptr_t V8_AsciiStringTag;
-static intptr_t V8_StringRepresentationMask;
-static intptr_t V8_SeqStringTag;
-static intptr_t V8_ConsStringTag;
-static intptr_t V8_SlicedStringTag;
-static intptr_t V8_ExternalStringTag;
-static intptr_t V8_FailureTag;
-static intptr_t V8_FailureTagMask;
-static intptr_t V8_HeapObjectTag;
-static intptr_t V8_HeapObjectTagMask;
-static intptr_t V8_SmiTag;
-static intptr_t V8_SmiTagMask;
-static intptr_t V8_SmiValueShift;
-static intptr_t V8_SmiShiftSize;
-static intptr_t V8_PointerSizeLog2;
-
-static intptr_t V8_ISSHARED_SHIFT;
-static intptr_t V8_DICT_SHIFT;
-static intptr_t V8_DICT_PREFIX_SIZE;
-static intptr_t V8_DICT_ENTRY_SIZE;
-static intptr_t V8_DICT_START_INDEX;
-static intptr_t V8_PROP_IDX_CONTENT;
-static intptr_t V8_PROP_IDX_FIRST;
-static intptr_t V8_PROP_TYPE_FIELD;
-static intptr_t V8_PROP_FIRST_PHANTOM;
-static intptr_t V8_PROP_TYPE_MASK;
-static intptr_t V8_PROP_DESC_KEY;
-static intptr_t V8_PROP_DESC_DETAILS;
-static intptr_t V8_PROP_DESC_VALUE;
-static intptr_t V8_PROP_DESC_SIZE;
-static intptr_t V8_TRANSITIONS_IDX_DESC;
-
-static intptr_t V8_TYPE_JSOBJECT = -1;
-static intptr_t V8_TYPE_JSARRAY = -1;
-static intptr_t V8_TYPE_FIXEDARRAY = -1;
-
-static intptr_t V8_ELEMENTS_KIND_SHIFT;
-static intptr_t V8_ELEMENTS_KIND_BITCOUNT;
-static intptr_t V8_ELEMENTS_FAST_ELEMENTS;
-static intptr_t V8_ELEMENTS_FAST_HOLEY_ELEMENTS;
-static intptr_t V8_ELEMENTS_DICTIONARY_ELEMENTS;
-
-/*
- * Although we have this information in v8_classes, the following offsets are
- * defined explicitly because they're used directly in code below.
- */
-static ssize_t V8_OFF_CODE_INSTRUCTION_SIZE;
-static ssize_t V8_OFF_CODE_INSTRUCTION_START;
-static ssize_t V8_OFF_CONSSTRING_FIRST;
-static ssize_t V8_OFF_CONSSTRING_SECOND;
-static ssize_t V8_OFF_EXTERNALSTRING_RESOURCE;
-static ssize_t V8_OFF_FIXEDARRAY_DATA;
-static ssize_t V8_OFF_FIXEDARRAY_LENGTH;
-static ssize_t V8_OFF_HEAPNUMBER_VALUE;
-static ssize_t V8_OFF_HEAPOBJECT_MAP;
-static ssize_t V8_OFF_JSARRAY_LENGTH;
-static ssize_t V8_OFF_JSDATE_VALUE;
-static ssize_t V8_OFF_JSFUNCTION_SHARED;
-static ssize_t V8_OFF_JSOBJECT_ELEMENTS;
-static ssize_t V8_OFF_JSOBJECT_PROPERTIES;
-static ssize_t V8_OFF_MAP_CONSTRUCTOR;
-static ssize_t V8_OFF_MAP_INOBJECT_PROPERTIES;
-static ssize_t V8_OFF_MAP_INSTANCE_ATTRIBUTES;
-static ssize_t V8_OFF_MAP_INSTANCE_DESCRIPTORS;
-static ssize_t V8_OFF_MAP_INSTANCE_SIZE;
-static ssize_t V8_OFF_MAP_BIT_FIELD;
-static ssize_t V8_OFF_MAP_BIT_FIELD2;
-static ssize_t V8_OFF_MAP_BIT_FIELD3;
-static ssize_t V8_OFF_MAP_TRANSITIONS;
-static ssize_t V8_OFF_ODDBALL_TO_STRING;
-static ssize_t V8_OFF_SCRIPT_LINE_ENDS;
-static ssize_t V8_OFF_SCRIPT_NAME;
-static ssize_t V8_OFF_SCRIPT_SOURCE;
-static ssize_t V8_OFF_SEQASCIISTR_CHARS;
-static ssize_t V8_OFF_SEQONEBYTESTR_CHARS;
-static ssize_t V8_OFF_SEQTWOBYTESTR_CHARS;
-static ssize_t V8_OFF_SHAREDFUNCTIONINFO_CODE;
-static ssize_t V8_OFF_SHAREDFUNCTIONINFO_END_POSITION;
-static ssize_t V8_OFF_SHAREDFUNCTIONINFO_FUNCTION_TOKEN_POSITION;
-static ssize_t V8_OFF_SHAREDFUNCTIONINFO_INFERRED_NAME;
-static ssize_t V8_OFF_SHAREDFUNCTIONINFO_LENGTH;
-static ssize_t V8_OFF_SHAREDFUNCTIONINFO_SCRIPT;
-static ssize_t V8_OFF_SHAREDFUNCTIONINFO_NAME;
-static ssize_t V8_OFF_SLICEDSTRING_PARENT;
-static ssize_t V8_OFF_SLICEDSTRING_OFFSET;
-static ssize_t V8_OFF_STRING_LENGTH;
-
-#define NODE_OFF_EXTSTR_DATA 0x4 /* see node_string.h */
-
-#define V8_CONSTANT_OPTIONAL 1
-#define V8_CONSTANT_HASFALLBACK 2
-
-#define V8_CONSTANT_MAJORSHIFT 3
-#define V8_CONSTANT_MAJORMASK ((1 << 4) - 1)
-#define V8_CONSTANT_MAJOR(flags) \
- (((flags) >> V8_CONSTANT_MAJORSHIFT) & V8_CONSTANT_MAJORMASK)
-
-#define V8_CONSTANT_MINORSHIFT 7
-#define V8_CONSTANT_MINORMASK ((1 << 9) - 1)
-#define V8_CONSTANT_MINOR(flags) \
- (((flags) >> V8_CONSTANT_MINORSHIFT) & V8_CONSTANT_MINORMASK)
-
-#define V8_CONSTANT_FALLBACK(maj, min) \
- (V8_CONSTANT_OPTIONAL | V8_CONSTANT_HASFALLBACK | \
- ((maj) << V8_CONSTANT_MAJORSHIFT) | ((min) << V8_CONSTANT_MINORSHIFT))
-
-/*
- * Table of constants used directly by this file.
- */
-typedef struct v8_constant {
- intptr_t *v8c_valp;
- const char *v8c_symbol;
- uint32_t v8c_flags;
- intptr_t v8c_fallback;
-} v8_constant_t;
-
-static v8_constant_t v8_constants[] = {
- { &V8_OFF_FP_CONTEXT, "v8dbg_off_fp_context" },
- { &V8_OFF_FP_FUNCTION, "v8dbg_off_fp_function" },
- { &V8_OFF_FP_MARKER, "v8dbg_off_fp_marker" },
- { &V8_OFF_FP_ARGS, "v8dbg_off_fp_args" },
-
- { &V8_FirstNonstringType, "v8dbg_FirstNonstringType" },
- { &V8_IsNotStringMask, "v8dbg_IsNotStringMask" },
- { &V8_StringTag, "v8dbg_StringTag" },
- { &V8_NotStringTag, "v8dbg_NotStringTag" },
- { &V8_StringEncodingMask, "v8dbg_StringEncodingMask" },
- { &V8_TwoByteStringTag, "v8dbg_TwoByteStringTag" },
- { &V8_AsciiStringTag, "v8dbg_AsciiStringTag" },
- { &V8_StringRepresentationMask, "v8dbg_StringRepresentationMask" },
- { &V8_SeqStringTag, "v8dbg_SeqStringTag" },
- { &V8_ConsStringTag, "v8dbg_ConsStringTag" },
- { &V8_SlicedStringTag, "v8dbg_SlicedStringTag",
- V8_CONSTANT_FALLBACK(0, 0), 0x3 },
- { &V8_ExternalStringTag, "v8dbg_ExternalStringTag" },
- { &V8_FailureTag, "v8dbg_FailureTag" },
- { &V8_FailureTagMask, "v8dbg_FailureTagMask" },
- { &V8_HeapObjectTag, "v8dbg_HeapObjectTag" },
- { &V8_HeapObjectTagMask, "v8dbg_HeapObjectTagMask" },
- { &V8_SmiTag, "v8dbg_SmiTag" },
- { &V8_SmiTagMask, "v8dbg_SmiTagMask" },
- { &V8_SmiValueShift, "v8dbg_SmiValueShift" },
- { &V8_SmiShiftSize, "v8dbg_SmiShiftSize",
-#ifdef _LP64
- V8_CONSTANT_FALLBACK(0, 0), 31 },
-#else
- V8_CONSTANT_FALLBACK(0, 0), 0 },
-#endif
- { &V8_PointerSizeLog2, "v8dbg_PointerSizeLog2" },
-
- { &V8_DICT_SHIFT, "v8dbg_dict_shift",
- V8_CONSTANT_FALLBACK(3, 13), 24 },
- { &V8_DICT_PREFIX_SIZE, "v8dbg_dict_prefix_size",
- V8_CONSTANT_FALLBACK(3, 11), 2 },
- { &V8_DICT_ENTRY_SIZE, "v8dbg_dict_entry_size",
- V8_CONSTANT_FALLBACK(3, 11), 3 },
- { &V8_DICT_START_INDEX, "v8dbg_dict_start_index",
- V8_CONSTANT_FALLBACK(3, 11), 3 },
- { &V8_ISSHARED_SHIFT, "v8dbg_isshared_shift",
- V8_CONSTANT_FALLBACK(3, 11), 0 },
- { &V8_PROP_IDX_FIRST, "v8dbg_prop_idx_first" },
- { &V8_PROP_TYPE_FIELD, "v8dbg_prop_type_field" },
- { &V8_PROP_FIRST_PHANTOM, "v8dbg_prop_type_first_phantom" },
- { &V8_PROP_TYPE_MASK, "v8dbg_prop_type_mask" },
- { &V8_PROP_IDX_CONTENT, "v8dbg_prop_idx_content",
- V8_CONSTANT_OPTIONAL },
- { &V8_PROP_DESC_KEY, "v8dbg_prop_desc_key",
- V8_CONSTANT_FALLBACK(0, 0), 0 },
- { &V8_PROP_DESC_DETAILS, "v8dbg_prop_desc_details",
- V8_CONSTANT_FALLBACK(0, 0), 1 },
- { &V8_PROP_DESC_VALUE, "v8dbg_prop_desc_value",
- V8_CONSTANT_FALLBACK(0, 0), 2 },
- { &V8_PROP_DESC_SIZE, "v8dbg_prop_desc_size",
- V8_CONSTANT_FALLBACK(0, 0), 3 },
- { &V8_TRANSITIONS_IDX_DESC, "v8dbg_transitions_idx_descriptors",
- V8_CONSTANT_OPTIONAL },
-
- { &V8_ELEMENTS_KIND_SHIFT, "v8dbg_elements_kind_shift",
- V8_CONSTANT_FALLBACK(0, 0), 3 },
- { &V8_ELEMENTS_KIND_BITCOUNT, "v8dbg_elements_kind_bitcount",
- V8_CONSTANT_FALLBACK(0, 0), 5 },
- { &V8_ELEMENTS_FAST_ELEMENTS,
- "v8dbg_elements_fast_elements",
- V8_CONSTANT_FALLBACK(0, 0), 2 },
- { &V8_ELEMENTS_FAST_HOLEY_ELEMENTS,
- "v8dbg_elements_fast_holey_elements",
- V8_CONSTANT_FALLBACK(0, 0), 3 },
- { &V8_ELEMENTS_DICTIONARY_ELEMENTS,
- "v8dbg_elements_dictionary_elements",
- V8_CONSTANT_FALLBACK(0, 0), 6 },
-};
-
-static int v8_nconstants = sizeof (v8_constants) / sizeof (v8_constants[0]);
-
-typedef struct v8_offset {
- ssize_t *v8o_valp;
- const char *v8o_class;
- const char *v8o_member;
- boolean_t v8o_optional;
-} v8_offset_t;
-
-static v8_offset_t v8_offsets[] = {
- { &V8_OFF_CODE_INSTRUCTION_SIZE,
- "Code", "instruction_size" },
- { &V8_OFF_CODE_INSTRUCTION_START,
- "Code", "instruction_start" },
- { &V8_OFF_CONSSTRING_FIRST,
- "ConsString", "first" },
- { &V8_OFF_CONSSTRING_SECOND,
- "ConsString", "second" },
- { &V8_OFF_EXTERNALSTRING_RESOURCE,
- "ExternalString", "resource" },
- { &V8_OFF_FIXEDARRAY_DATA,
- "FixedArray", "data" },
- { &V8_OFF_FIXEDARRAY_LENGTH,
- "FixedArray", "length" },
- { &V8_OFF_HEAPNUMBER_VALUE,
- "HeapNumber", "value" },
- { &V8_OFF_HEAPOBJECT_MAP,
- "HeapObject", "map" },
- { &V8_OFF_JSARRAY_LENGTH,
- "JSArray", "length" },
- { &V8_OFF_JSDATE_VALUE,
- "JSDate", "value", B_TRUE },
- { &V8_OFF_JSFUNCTION_SHARED,
- "JSFunction", "shared" },
- { &V8_OFF_JSOBJECT_ELEMENTS,
- "JSObject", "elements" },
- { &V8_OFF_JSOBJECT_PROPERTIES,
- "JSObject", "properties" },
- { &V8_OFF_MAP_CONSTRUCTOR,
- "Map", "constructor" },
- { &V8_OFF_MAP_INOBJECT_PROPERTIES,
- "Map", "inobject_properties" },
- { &V8_OFF_MAP_INSTANCE_ATTRIBUTES,
- "Map", "instance_attributes" },
- { &V8_OFF_MAP_INSTANCE_DESCRIPTORS,
- "Map", "instance_descriptors", B_TRUE },
- { &V8_OFF_MAP_TRANSITIONS,
- "Map", "transitions", B_TRUE },
- { &V8_OFF_MAP_INSTANCE_SIZE,
- "Map", "instance_size" },
- { &V8_OFF_MAP_BIT_FIELD2,
- "Map", "bit_field2", B_TRUE },
- { &V8_OFF_MAP_BIT_FIELD3,
- "Map", "bit_field3", B_TRUE },
- { &V8_OFF_ODDBALL_TO_STRING,
- "Oddball", "to_string" },
- { &V8_OFF_SCRIPT_LINE_ENDS,
- "Script", "line_ends" },
- { &V8_OFF_SCRIPT_NAME,
- "Script", "name" },
- { &V8_OFF_SCRIPT_SOURCE,
- "Script", "source" },
- { &V8_OFF_SEQASCIISTR_CHARS,
- "SeqAsciiString", "chars", B_TRUE },
- { &V8_OFF_SEQONEBYTESTR_CHARS,
- "SeqOneByteString", "chars", B_TRUE },
- { &V8_OFF_SEQTWOBYTESTR_CHARS,
- "SeqTwoByteString", "chars", B_TRUE },
- { &V8_OFF_SHAREDFUNCTIONINFO_CODE,
- "SharedFunctionInfo", "code" },
- { &V8_OFF_SHAREDFUNCTIONINFO_END_POSITION,
- "SharedFunctionInfo", "end_position" },
- { &V8_OFF_SHAREDFUNCTIONINFO_FUNCTION_TOKEN_POSITION,
- "SharedFunctionInfo", "function_token_position" },
- { &V8_OFF_SHAREDFUNCTIONINFO_INFERRED_NAME,
- "SharedFunctionInfo", "inferred_name" },
- { &V8_OFF_SHAREDFUNCTIONINFO_LENGTH,
- "SharedFunctionInfo", "length" },
- { &V8_OFF_SHAREDFUNCTIONINFO_NAME,
- "SharedFunctionInfo", "name" },
- { &V8_OFF_SHAREDFUNCTIONINFO_SCRIPT,
- "SharedFunctionInfo", "script" },
- { &V8_OFF_SLICEDSTRING_OFFSET,
- "SlicedString", "offset" },
- { &V8_OFF_SLICEDSTRING_PARENT,
- "SlicedString", "parent", B_TRUE },
- { &V8_OFF_STRING_LENGTH,
- "String", "length" },
-};
-
-static int v8_noffsets = sizeof (v8_offsets) / sizeof (v8_offsets[0]);
-
-static uintptr_t v8_major;
-static uintptr_t v8_minor;
-static uintptr_t v8_build;
-static uintptr_t v8_patch;
-
-static int autoconf_iter_symbol(mdb_symbol_t *, void *);
-static v8_class_t *conf_class_findcreate(const char *);
-static v8_field_t *conf_field_create(v8_class_t *, const char *, size_t);
-static char *conf_next_part(char *, char *);
-static int conf_update_parent(const char *);
-static int conf_update_field(v8_cfg_t *, const char *);
-static int conf_update_enum(v8_cfg_t *, const char *, const char *,
- v8_enum_t *);
-static int conf_update_type(v8_cfg_t *, const char *);
-static int conf_update_frametype(v8_cfg_t *, const char *);
-static void conf_class_compute_offsets(v8_class_t *);
-
-static int read_typebyte(uint8_t *, uintptr_t);
-static int heap_offset(const char *, const char *, ssize_t *);
-
-/*
- * Invoked when this dmod is initially loaded to load the set of classes, enums,
- * and other constants from the metadata in the target binary.
- */
-static int
-autoconfigure(v8_cfg_t *cfgp)
-{
- v8_class_t *clp;
- v8_enum_t *ep;
- struct v8_constant *cnp;
- int ii;
- int failed = 0;
-
- assert(v8_classes == NULL);
-
- /*
- * Iterate all global symbols looking for metadata.
- */
- if (cfgp->v8cfg_iter(cfgp, autoconf_iter_symbol, cfgp) != 0) {
- mdb_warn("failed to autoconfigure V8 support\n");
- return (-1);
- }
-
- /*
- * By now we've configured all of the classes so we can update the
- * "start" and "end" fields in each class with information from its
- * parent class.
- */
- for (clp = v8_classes; clp != NULL; clp = clp->v8c_next) {
- if (clp->v8c_end != (size_t)-1)
- continue;
-
- conf_class_compute_offsets(clp);
- };
-
- /*
- * Load various constants used directly in the module.
- */
- for (ii = 0; ii < v8_nconstants; ii++) {
- cnp = &v8_constants[ii];
-
- if (cfgp->v8cfg_readsym(cfgp,
- cnp->v8c_symbol, cnp->v8c_valp) != -1) {
- continue;
- }
-
- if (!(cnp->v8c_flags & V8_CONSTANT_OPTIONAL)) {
- mdb_warn("failed to read \"%s\"", cnp->v8c_symbol);
- failed++;
- continue;
- }
-
- if (!(cnp->v8c_flags & V8_CONSTANT_HASFALLBACK) ||
- v8_major < V8_CONSTANT_MAJOR(cnp->v8c_flags) ||
- (v8_major == V8_CONSTANT_MAJOR(cnp->v8c_flags) &&
- v8_minor < V8_CONSTANT_MINOR(cnp->v8c_flags))) {
- *cnp->v8c_valp = -1;
- continue;
- }
-
- /*
- * We have a fallback -- and we know that the version satisfies
- * the fallback's version constraints; use the fallback value.
- */
- *cnp->v8c_valp = cnp->v8c_fallback;
- }
-
- /*
- * Load type values for well-known classes that we use a lot.
- */
- for (ep = v8_types; ep->v8e_name[0] != '\0'; ep++) {
- if (strcmp(ep->v8e_name, "JSObject") == 0)
- V8_TYPE_JSOBJECT = ep->v8e_value;
-
- if (strcmp(ep->v8e_name, "JSArray") == 0)
- V8_TYPE_JSARRAY = ep->v8e_value;
-
- if (strcmp(ep->v8e_name, "FixedArray") == 0)
- V8_TYPE_FIXEDARRAY = ep->v8e_value;
- }
-
- if (V8_TYPE_JSOBJECT == -1) {
- mdb_warn("couldn't find JSObject type\n");
- failed++;
- }
-
- if (V8_TYPE_JSARRAY == -1) {
- mdb_warn("couldn't find JSArray type\n");
- failed++;
- }
-
- if (V8_TYPE_FIXEDARRAY == -1) {
- mdb_warn("couldn't find FixedArray type\n");
- failed++;
- }
-
- /*
- * Finally, load various class offsets.
- */
- for (ii = 0; ii < v8_noffsets; ii++) {
- struct v8_offset *offp = &v8_offsets[ii];
- const char *klass = offp->v8o_class;
-
-again:
- if (heap_offset(klass, offp->v8o_member, offp->v8o_valp) == 0)
- continue;
-
- if (strcmp(klass, "FixedArray") == 0) {
- /*
- * The V8 included in node v0.6 uses a FixedArrayBase
- * class to contain the "length" field, while the one
- * in v0.4 has no such base class and stores the field
- * directly in FixedArray; if we failed to derive
- * the offset from FixedArray, try FixedArrayBase.
- */
- klass = "FixedArrayBase";
- goto again;
- }
-
- if (offp->v8o_optional) {
- *offp->v8o_valp = -1;
- continue;
- }
-
- mdb_warn("couldn't find class \"%s\", field \"%s\"\n",
- offp->v8o_class, offp->v8o_member);
- failed++;
- }
-
- if (!((V8_OFF_SEQASCIISTR_CHARS != -1) ^
- (V8_OFF_SEQONEBYTESTR_CHARS != -1))) {
- mdb_warn("expected exactly one of SeqAsciiString and "
- "SeqOneByteString to be defined\n");
- failed++;
- }
-
- if (V8_OFF_SEQONEBYTESTR_CHARS != -1)
- V8_OFF_SEQASCIISTR_CHARS = V8_OFF_SEQONEBYTESTR_CHARS;
-
- if (V8_OFF_SEQTWOBYTESTR_CHARS == -1)
- V8_OFF_SEQTWOBYTESTR_CHARS = V8_OFF_SEQASCIISTR_CHARS;
-
- if (V8_OFF_SLICEDSTRING_PARENT == -1)
- V8_OFF_SLICEDSTRING_PARENT = V8_OFF_SLICEDSTRING_OFFSET -
- sizeof (uintptr_t);
-
- /*
- * If we don't have bit_field/bit_field2 for Map, we know that they're
- * the second and third byte of instance_attributes.
- */
- if (V8_OFF_MAP_BIT_FIELD == -1)
- V8_OFF_MAP_BIT_FIELD = V8_OFF_MAP_INSTANCE_ATTRIBUTES + 2;
-
- if (V8_OFF_MAP_BIT_FIELD2 == -1)
- V8_OFF_MAP_BIT_FIELD2 = V8_OFF_MAP_INSTANCE_ATTRIBUTES + 3;
-
- return (failed ? -1 : 0);
-}
-
-/* ARGSUSED */
-static int
-autoconf_iter_symbol(mdb_symbol_t *symp, void *arg)
-{
- v8_cfg_t *cfgp = arg;
-
- if (strncmp(symp->sym_name, "v8dbg_parent_",
- sizeof ("v8dbg_parent_") - 1) == 0)
- return (conf_update_parent(symp->sym_name));
-
- if (strncmp(symp->sym_name, "v8dbg_class_",
- sizeof ("v8dbg_class_") - 1) == 0)
- return (conf_update_field(cfgp, symp->sym_name));
-
- if (strncmp(symp->sym_name, "v8dbg_type_",
- sizeof ("v8dbg_type_") - 1) == 0)
- return (conf_update_type(cfgp, symp->sym_name));
-
- if (strncmp(symp->sym_name, "v8dbg_frametype_",
- sizeof ("v8dbg_frametype_") - 1) == 0)
- return (conf_update_frametype(cfgp, symp->sym_name));
-
- return (0);
-}
-
-/*
- * Extracts the next field of a string whose fields are separated by "__" (as
- * the V8 metadata symbols are).
- */
-static char *
-conf_next_part(char *buf, char *start)
-{
- char *pp;
-
- if ((pp = strstr(start, "__")) == NULL) {
- mdb_warn("malformed symbol name: %s\n", buf);
- return (NULL);
- }
-
- *pp = '\0';
- return (pp + sizeof ("__") - 1);
-}
-
-static v8_class_t *
-conf_class_findcreate(const char *name)
-{
- v8_class_t *clp, *iclp, *prev = NULL;
- int cmp;
-
- for (iclp = v8_classes; iclp != NULL; iclp = iclp->v8c_next) {
- if ((cmp = strcmp(iclp->v8c_name, name)) == 0)
- return (iclp);
-
- if (cmp > 0)
- break;
-
- prev = iclp;
- }
-
- if ((clp = mdb_zalloc(sizeof (*clp), UM_NOSLEEP)) == NULL)
- return (NULL);
-
- (void) strlcpy(clp->v8c_name, name, sizeof (clp->v8c_name));
- clp->v8c_end = (size_t)-1;
- clp->v8c_next = iclp;
-
- if (prev != NULL) {
- prev->v8c_next = clp;
- } else {
- v8_classes = clp;
- }
-
- return (clp);
-}
-
-static v8_field_t *
-conf_field_create(v8_class_t *clp, const char *name, size_t offset)
-{
- v8_field_t *flp, *iflp;
-
- if ((flp = mdb_zalloc(sizeof (*flp), UM_NOSLEEP)) == NULL)
- return (NULL);
-
- (void) strlcpy(flp->v8f_name, name, sizeof (flp->v8f_name));
- flp->v8f_offset = offset;
-
- if (clp->v8c_fields == NULL || clp->v8c_fields->v8f_offset > offset) {
- flp->v8f_next = clp->v8c_fields;
- clp->v8c_fields = flp;
- return (flp);
- }
-
- for (iflp = clp->v8c_fields; iflp->v8f_next != NULL;
- iflp = iflp->v8f_next) {
- if (iflp->v8f_next->v8f_offset > offset)
- break;
- }
-
- flp->v8f_next = iflp->v8f_next;
- iflp->v8f_next = flp;
- return (flp);
-}
-
-/*
- * Given a "v8dbg_parent_X__Y", symbol, update the parent of class X to class Y.
- * Note that neither class necessarily exists already.
- */
-static int
-conf_update_parent(const char *symbol)
-{
- char *pp, *qq;
- char buf[128];
- v8_class_t *clp, *pclp;
-
- (void) strlcpy(buf, symbol, sizeof (buf));
- pp = buf + sizeof ("v8dbg_parent_") - 1;
- qq = conf_next_part(buf, pp);
-
- if (qq == NULL)
- return (-1);
-
- clp = conf_class_findcreate(pp);
- pclp = conf_class_findcreate(qq);
-
- if (clp == NULL || pclp == NULL) {
- mdb_warn("mdb_v8: out of memory\n");
- return (-1);
- }
-
- clp->v8c_parent = pclp;
- return (0);
-}
-
-/*
- * Given a "v8dbg_class_CLASS__FIELD__TYPE", symbol, save field "FIELD" into
- * class CLASS with the offset described by the symbol. Note that CLASS does
- * not necessarily exist already.
- */
-static int
-conf_update_field(v8_cfg_t *cfgp, const char *symbol)
-{
- v8_class_t *clp;
- v8_field_t *flp;
- intptr_t offset;
- char *pp, *qq, *tt;
- char buf[128];
-
- (void) strlcpy(buf, symbol, sizeof (buf));
-
- pp = buf + sizeof ("v8dbg_class_") - 1;
- qq = conf_next_part(buf, pp);
-
- if (qq == NULL || (tt = conf_next_part(buf, qq)) == NULL)
- return (-1);
-
- if (cfgp->v8cfg_readsym(cfgp, symbol, &offset) == -1) {
- mdb_warn("failed to read symbol \"%s\"", symbol);
- return (-1);
- }
-
- if ((clp = conf_class_findcreate(pp)) == NULL ||
- (flp = conf_field_create(clp, qq, (size_t)offset)) == NULL)
- return (-1);
-
- if (strcmp(tt, "int") == 0)
- flp->v8f_isbyte = B_TRUE;
-
- if (strcmp(tt, "char") == 0)
- flp->v8f_isstr = B_TRUE;
-
- return (0);
-}
-
-static int
-conf_update_enum(v8_cfg_t *cfgp, const char *symbol, const char *name,
- v8_enum_t *enp)
-{
- intptr_t value;
-
- if (cfgp->v8cfg_readsym(cfgp, symbol, &value) == -1) {
- mdb_warn("failed to read symbol \"%s\"", symbol);
- return (-1);
- }
-
- enp->v8e_value = (int)value;
- (void) strlcpy(enp->v8e_name, name, sizeof (enp->v8e_name));
- return (0);
-}
-
-/*
- * Given a "v8dbg_type_TYPENAME" constant, save the type name in v8_types. Note
- * that this enum has multiple integer values with the same string label.
- */
-static int
-conf_update_type(v8_cfg_t *cfgp, const char *symbol)
-{
- char *klass;
- v8_enum_t *enp;
- char buf[128];
-
- if (v8_next_type > sizeof (v8_types) / sizeof (v8_types[0])) {
- mdb_warn("too many V8 types\n");
- return (-1);
- }
-
- (void) strlcpy(buf, symbol, sizeof (buf));
-
- klass = buf + sizeof ("v8dbg_type_") - 1;
- if (conf_next_part(buf, klass) == NULL)
- return (-1);
-
- enp = &v8_types[v8_next_type++];
- return (conf_update_enum(cfgp, symbol, klass, enp));
-}
-
-/*
- * Given a "v8dbg_frametype_TYPENAME" constant, save the frame type in
- * v8_frametypes.
- */
-static int
-conf_update_frametype(v8_cfg_t *cfgp, const char *symbol)
-{
- const char *frametype;
- v8_enum_t *enp;
-
- if (v8_next_frametype >
- sizeof (v8_frametypes) / sizeof (v8_frametypes[0])) {
- mdb_warn("too many V8 frame types\n");
- return (-1);
- }
-
- enp = &v8_frametypes[v8_next_frametype++];
- frametype = symbol + sizeof ("v8dbg_frametype_") - 1;
- return (conf_update_enum(cfgp, symbol, frametype, enp));
-}
-
-/*
- * Now that all classes have been loaded, update the "start" and "end" fields of
- * each class based on the values of its parent class.
- */
-static void
-conf_class_compute_offsets(v8_class_t *clp)
-{
- v8_field_t *flp;
-
- assert(clp->v8c_start == 0);
- assert(clp->v8c_end == (size_t)-1);
-
- if (clp->v8c_parent != NULL) {
- if (clp->v8c_parent->v8c_end == (size_t)-1)
- conf_class_compute_offsets(clp->v8c_parent);
-
- clp->v8c_start = clp->v8c_parent->v8c_end;
- }
-
- if (clp->v8c_fields == NULL) {
- clp->v8c_end = clp->v8c_start;
- return;
- }
-
- for (flp = clp->v8c_fields; flp->v8f_next != NULL; flp = flp->v8f_next)
- ;
-
- if (flp == NULL)
- clp->v8c_end = clp->v8c_start;
- else
- clp->v8c_end = flp->v8f_offset + sizeof (uintptr_t);
-}
-
-/*
- * Utility functions
- */
-#define JSSTR_NONE 0
-#define JSSTR_NUDE JSSTR_NONE
-
-#define JSSTR_FLAGSHIFT 16
-#define JSSTR_VERBOSE (0x1 << JSSTR_FLAGSHIFT)
-#define JSSTR_QUOTED (0x2 << JSSTR_FLAGSHIFT)
-#define JSSTR_ISASCII (0x4 << JSSTR_FLAGSHIFT)
-
-#define JSSTR_MAXDEPTH 512
-#define JSSTR_DEPTH(f) ((f) & ((1 << JSSTR_FLAGSHIFT) - 1))
-#define JSSTR_BUMPDEPTH(f) ((f) + 1)
-
-static int jsstr_print(uintptr_t, uint_t, char **, size_t *);
-static boolean_t jsobj_is_undefined(uintptr_t addr);
-static boolean_t jsobj_is_hole(uintptr_t addr);
-
-static const char *
-enum_lookup_str(v8_enum_t *enums, int val, const char *dflt)
-{
- v8_enum_t *ep;
-
- for (ep = enums; ep->v8e_name[0] != '\0'; ep++) {
- if (ep->v8e_value == val)
- return (ep->v8e_name);
- }
-
- return (dflt);
-}
-
-static void
-enum_print(v8_enum_t *enums)
-{
- v8_enum_t *itp;
-
- for (itp = enums; itp->v8e_name[0] != '\0'; itp++)
- mdb_printf("%-30s = 0x%02x\n", itp->v8e_name, itp->v8e_value);
-}
-
-/*
- * b[v]snprintf behave like [v]snprintf(3c), except that they update the buffer
- * and length arguments based on how much buffer space is used by the operation.
- * This makes it much easier to combine multiple calls in sequence without
- * worrying about buffer overflow.
- */
-static size_t
-bvsnprintf(char **bufp, size_t *buflenp, const char *format, va_list alist)
-{
- size_t rv, len;
-
- if (*buflenp == 0)
- return (vsnprintf(NULL, 0, format, alist));
-
- rv = vsnprintf(*bufp, *buflenp, format, alist);
-
- len = MIN(rv, *buflenp);
- *buflenp -= len;
- *bufp += len;
-
- return (len);
-}
-
-static size_t
-bsnprintf(char **bufp, size_t *buflenp, const char *format, ...)
-{
- va_list alist;
- size_t rv;
-
- va_start(alist, format);
- rv = bvsnprintf(bufp, buflenp, format, alist);
- va_end(alist);
-
- return (rv);
-}
-
-static void
-v8_warn(const char *format, ...)
-{
- char buf[512];
- va_list alist;
- int len;
-
- if (!v8_warnings || v8_silent)
- return;
-
- va_start(alist, format);
- (void) vsnprintf(buf, sizeof (buf), format, alist);
- va_end(alist);
-
- /*
- * This is made slightly annoying because we need to effectively
- * preserve the original format string to allow for mdb to use the
- * new-line at the end to indicate that strerror should be elided.
- */
- if ((len = strlen(format)) > 0 && format[len - 1] == '\n') {
- buf[strlen(buf) - 1] = '\0';
- mdb_warn("%s\n", buf);
- } else {
- mdb_warn("%s", buf);
- }
-}
-
-/*
- * Returns in "offp" the offset of field "field" in C++ class "klass".
- */
-static int
-heap_offset(const char *klass, const char *field, ssize_t *offp)
-{
- v8_class_t *clp;
- v8_field_t *flp;
-
- for (clp = v8_classes; clp != NULL; clp = clp->v8c_next) {
- if (strcmp(klass, clp->v8c_name) == 0)
- break;
- }
-
- if (clp == NULL)
- return (-1);
-
- for (flp = clp->v8c_fields; flp != NULL; flp = flp->v8f_next) {
- if (strcmp(field, flp->v8f_name) == 0)
- break;
- }
-
- if (flp == NULL)
- return (-1);
-
- *offp = V8_OFF_HEAP(flp->v8f_offset);
- return (0);
-}
-
-/*
- * Assuming "addr" is an instance of the C++ heap class "klass", read into *valp
- * the pointer-sized value of field "field".
- */
-static int
-read_heap_ptr(uintptr_t *valp, uintptr_t addr, ssize_t off)
-{
- if (mdb_vread(valp, sizeof (*valp), addr + off) == -1) {
- v8_warn("failed to read offset %d from %p", off, addr);
- return (-1);
- }
-
- return (0);
-}
-
-/*
- * Like read_heap_ptr, but assume the field is an SMI and store the actual value
- * into *valp rather than the encoded representation.
- */
-static int
-read_heap_smi(uintptr_t *valp, uintptr_t addr, ssize_t off)
-{
- if (read_heap_ptr(valp, addr, off) != 0)
- return (-1);
-
- if (!V8_IS_SMI(*valp)) {
- v8_warn("expected SMI, got %p\n", *valp);
- return (-1);
- }
-
- *valp = V8_SMI_VALUE(*valp);
-
- return (0);
-}
-
-static int
-read_heap_double(double *valp, uintptr_t addr, ssize_t off)
-{
- if (mdb_vread(valp, sizeof (*valp), addr + off) == -1) {
- v8_warn("failed to read heap value at %p", addr + off);
- return (-1);
- }
-
- return (0);
-}
-
-/*
- * Assuming "addr" refers to a FixedArray, return a newly-allocated array
- * representing its contents.
- */
-static int
-read_heap_array(uintptr_t addr, uintptr_t **retp, size_t *lenp, int flags)
-{
- uint8_t type;
- uintptr_t len;
-
- if (!V8_IS_HEAPOBJECT(addr))
- return (-1);
-
- if (read_typebyte(&type, addr) != 0)
- return (-1);
-
- if (type != V8_TYPE_FIXEDARRAY)
- return (-1);
-
- if (read_heap_smi(&len, addr, V8_OFF_FIXEDARRAY_LENGTH) != 0)
- return (-1);
-
- *lenp = len;
-
- if (len == 0) {
- *retp = NULL;
- return (0);
- }
-
- if ((*retp = mdb_zalloc(len * sizeof (uintptr_t), flags)) == NULL)
- return (-1);
-
- if (mdb_vread(*retp, len * sizeof (uintptr_t),
- addr + V8_OFF_FIXEDARRAY_DATA) == -1) {
- if (!(flags & UM_GC))
- mdb_free(*retp, len * sizeof (uintptr_t));
-
- *retp = NULL;
- return (-1);
- }
-
- return (0);
-}
-
-static int
-read_heap_byte(uint8_t *valp, uintptr_t addr, ssize_t off)
-{
- if (mdb_vread(valp, sizeof (*valp), addr + off) == -1) {
- v8_warn("failed to read heap value at %p", addr + off);
- return (-1);
- }
-
- return (0);
-}
-
-/*
- * Given a heap object, returns in *valp the byte describing the type of the
- * object. This is shorthand for first retrieving the Map at the start of the
- * heap object and then retrieving the type byte from the Map object.
- */
-static int
-read_typebyte(uint8_t *valp, uintptr_t addr)
-{
- uintptr_t mapaddr;
- ssize_t off = V8_OFF_HEAPOBJECT_MAP;
-
- if (mdb_vread(&mapaddr, sizeof (mapaddr), addr + off) == -1) {
- v8_warn("failed to read type of %p", addr);
- return (-1);
- }
-
- if (!V8_IS_HEAPOBJECT(mapaddr)) {
- v8_warn("object map is not a heap object\n");
- return (-1);
- }
-
- if (read_heap_byte(valp, mapaddr, V8_OFF_MAP_INSTANCE_ATTRIBUTES) == -1)
- return (-1);
-
- return (0);
-}
-
-/*
- * Given a heap object, returns in *valp the size of the object. For
- * variable-size objects, returns an undefined value.
- */
-static int
-read_size(size_t *valp, uintptr_t addr)
-{
- uintptr_t mapaddr;
- uint8_t size;
-
- if (read_heap_ptr(&mapaddr, addr, V8_OFF_HEAPOBJECT_MAP) != 0)
- return (-1);
-
- if (!V8_IS_HEAPOBJECT(mapaddr)) {
- v8_warn("heap object map is not itself a heap object\n");
- return (-1);
- }
-
- if (read_heap_byte(&size, mapaddr, V8_OFF_MAP_INSTANCE_SIZE) != 0)
- return (-1);
-
- *valp = size << V8_PointerSizeLog2;
- return (0);
-}
-
-/*
- * Assuming "addr" refers to a FixedArray that is implementing a
- * StringDictionary, iterate over its contents calling the specified function
- * with key and value.
- */
-static int
-read_heap_dict(uintptr_t addr,
- int (*func)(const char *, uintptr_t, void *), void *arg)
-{
- uint8_t type;
- uintptr_t len;
- char buf[512];
- char *bufp;
- int rval = -1;
- uintptr_t *dict, ndict, i;
-
- if (read_heap_array(addr, &dict, &ndict, UM_SLEEP) != 0)
- return (-1);
-
- if (V8_DICT_ENTRY_SIZE < 2) {
- v8_warn("dictionary entry size (%d) is too small for a "
- "key and value\n", V8_DICT_ENTRY_SIZE);
- goto out;
- }
-
- for (i = V8_DICT_START_INDEX + V8_DICT_PREFIX_SIZE; i < ndict;
- i += V8_DICT_ENTRY_SIZE) {
- /*
- * The layout here is key, value, details. (This is hardcoded
- * in Dictionary<Shape, Key>::SetEntry().)
- */
- if (jsobj_is_undefined(dict[i]))
- continue;
-
- if (V8_IS_SMI(dict[i])) {
- intptr_t val = V8_SMI_VALUE(dict[i]);
-
- (void) snprintf(buf, sizeof (buf), "%ld", val);
- } else {
- if (jsobj_is_hole(dict[i])) {
- /*
- * In some cases, the key can (apparently) be a
- * hole, in which case we skip over it.
- */
- continue;
- }
-
- if (read_typebyte(&type, dict[i]) != 0)
- goto out;
-
- if (!V8_TYPE_STRING(type))
- goto out;
-
- bufp = buf;
- len = sizeof (buf);
-
- if (jsstr_print(dict[i], JSSTR_NUDE, &bufp, &len) != 0)
- goto out;
- }
-
- if (func(buf, dict[i + 1], arg) == -1)
- goto out;
- }
-
- rval = 0;
-out:
- mdb_free(dict, ndict * sizeof (uintptr_t));
-
- return (rval);
-}
-
-/*
- * Returns in "buf" a description of the type of "addr" suitable for printing.
- */
-static int
-obj_jstype(uintptr_t addr, char **bufp, size_t *lenp, uint8_t *typep)
-{
- uint8_t typebyte;
- uintptr_t strptr;
- const char *typename;
-
- if (V8_IS_FAILURE(addr)) {
- if (typep)
- *typep = 0;
- (void) bsnprintf(bufp, lenp, "'Failure' object");
- return (0);
- }
-
- if (V8_IS_SMI(addr)) {
- if (typep)
- *typep = 0;
- (void) bsnprintf(bufp, lenp, "SMI: value = %d",
- V8_SMI_VALUE(addr));
- return (0);
- }
-
- if (read_typebyte(&typebyte, addr) != 0)
- return (-1);
-
- if (typep)
- *typep = typebyte;
-
- typename = enum_lookup_str(v8_types, typebyte, "<unknown>");
- (void) bsnprintf(bufp, lenp, typename);
-
- if (strcmp(typename, "Oddball") == 0) {
- if (read_heap_ptr(&strptr, addr,
- V8_OFF_ODDBALL_TO_STRING) != -1) {
- (void) bsnprintf(bufp, lenp, ": \"");
- (void) jsstr_print(strptr, JSSTR_NUDE, bufp, lenp);
- (void) bsnprintf(bufp, lenp, "\"");
- }
- }
-
- return (0);
-}
-
-/*
- * Print out the fields of the given object that come from the given class.
- */
-static int
-obj_print_fields(uintptr_t baddr, v8_class_t *clp)
-{
- v8_field_t *flp;
- uintptr_t addr, value;
- int rv;
- char *bufp;
- size_t len;
- uint8_t type;
- char buf[256];
-
- for (flp = clp->v8c_fields; flp != NULL; flp = flp->v8f_next) {
- bufp = buf;
- len = sizeof (buf);
-
- addr = baddr + V8_OFF_HEAP(flp->v8f_offset);
-
- if (flp->v8f_isstr) {
- if (mdb_readstr(buf, sizeof (buf), addr) == -1) {
- mdb_printf("%p %s (unreadable)\n",
- addr, flp->v8f_name);
- continue;
- }
-
- mdb_printf("%p %s = \"%s\"\n",
- addr, flp->v8f_name, buf);
- continue;
- }
-
- if (flp->v8f_isbyte) {
- uint8_t sv;
- if (mdb_vread(&sv, sizeof (sv), addr) == -1) {
- mdb_printf("%p %s (unreadable)\n",
- addr, flp->v8f_name);
- continue;
- }
-
- mdb_printf("%p %s = 0x%x\n", addr, flp->v8f_name, sv);
- continue;
- }
-
- rv = mdb_vread((void *)&value, sizeof (value), addr);
-
- if (rv != sizeof (value) ||
- obj_jstype(value, &bufp, &len, &type) != 0) {
- mdb_printf("%p %s (unreadable)\n", addr, flp->v8f_name);
- continue;
- }
-
- if (type != 0 && V8_TYPE_STRING(type)) {
- (void) bsnprintf(&bufp, &len, ": ");
- (void) jsstr_print(value, JSSTR_QUOTED, &bufp, &len);
- }
-
- mdb_printf("%p %s = %p (%s)\n", addr, flp->v8f_name, value,
- buf);
- }
-
- return (DCMD_OK);
-}
-
-/*
- * Print out all fields of the given object, starting with the root of the class
- * hierarchy and working down the most specific type.
- */
-static int
-obj_print_class(uintptr_t addr, v8_class_t *clp)
-{
- int rv = 0;
-
- /*
- * If we have no fields, we just print a simple inheritance hierarchy.
- * If we have fields but our parent doesn't, our header includes the
- * inheritance hierarchy.
- */
- if (clp->v8c_end == 0) {
- mdb_printf("%s ", clp->v8c_name);
-
- if (clp->v8c_parent != NULL) {
- mdb_printf("< ");
- (void) obj_print_class(addr, clp->v8c_parent);
- }
-
- return (0);
- }
-
- mdb_printf("%p %s", addr, clp->v8c_name);
-
- if (clp->v8c_start == 0 && clp->v8c_parent != NULL) {
- mdb_printf(" < ");
- (void) obj_print_class(addr, clp->v8c_parent);
- }
-
- mdb_printf(" {\n");
- (void) mdb_inc_indent(4);
-
- if (clp->v8c_start > 0 && clp->v8c_parent != NULL)
- rv = obj_print_class(addr, clp->v8c_parent);
-
- rv |= obj_print_fields(addr, clp);
- (void) mdb_dec_indent(4);
- mdb_printf("}\n");
-
- return (rv);
-}
-
-/*
- * Print the ASCII string for the given JS string, expanding ConsStrings and
- * ExternalStrings as needed.
- */
-static int jsstr_print_seq(uintptr_t, uint_t, char **, size_t *, size_t,
- ssize_t);
-static int jsstr_print_cons(uintptr_t, uint_t, char **, size_t *);
-static int jsstr_print_sliced(uintptr_t, uint_t, char **, size_t *);
-static int jsstr_print_external(uintptr_t, uint_t, char **, size_t *);
-
-static int
-jsstr_print(uintptr_t addr, uint_t flags, char **bufp, size_t *lenp)
-{
- uint8_t typebyte;
- int err = 0;
- char *lbufp;
- size_t llen;
- char buf[64];
- boolean_t verbose = flags & JSSTR_VERBOSE ? B_TRUE : B_FALSE;
-
- if (read_typebyte(&typebyte, addr) != 0) {
- (void) bsnprintf(bufp, lenp, "<could not read type>");
- return (-1);
- }
-
- if (!V8_TYPE_STRING(typebyte)) {
- (void) bsnprintf(bufp, lenp, "<not a string>");
- return (-1);
- }
-
- if (verbose) {
- lbufp = buf;
- llen = sizeof (buf);
- (void) obj_jstype(addr, &lbufp, &llen, NULL);
- mdb_printf("%s\n", buf);
- (void) mdb_inc_indent(4);
- }
-
- if (JSSTR_DEPTH(flags) > JSSTR_MAXDEPTH) {
- (void) bsnprintf(bufp, lenp, "<maximum depth exceeded>");
- return (-1);
- }
-
- if (V8_STRENC_ASCII(typebyte))
- flags |= JSSTR_ISASCII;
- else
- flags &= ~JSSTR_ISASCII;
-
- flags = JSSTR_BUMPDEPTH(flags);
-
- if (V8_STRREP_SEQ(typebyte))
- err = jsstr_print_seq(addr, flags, bufp, lenp, 0, -1);
- else if (V8_STRREP_CONS(typebyte))
- err = jsstr_print_cons(addr, flags, bufp, lenp);
- else if (V8_STRREP_EXT(typebyte))
- err = jsstr_print_external(addr, flags, bufp, lenp);
- else if (V8_STRREP_SLICED(typebyte))
- err = jsstr_print_sliced(addr, flags, bufp, lenp);
- else {
- (void) bsnprintf(bufp, lenp, "<unknown string type>");
- err = -1;
- }
-
- if (verbose)
- (void) mdb_dec_indent(4);
-
- return (err);
-}
-
-static int
-jsstr_print_seq(uintptr_t addr, uint_t flags, char **bufp, size_t *lenp,
- size_t sliceoffset, ssize_t slicelen)
-{
- /*
- * To allow the caller to allocate a very large buffer for strings,
- * we'll allocate a buffer sized based on our input, making it at
- * least enough space for our ellipsis and at most 256K.
- */
- uintptr_t i, nreadoffset, blen, nstrbytes, nstrchrs;
- ssize_t nreadbytes;
- boolean_t verbose = flags & JSSTR_VERBOSE ? B_TRUE : B_FALSE;
- boolean_t quoted = flags & JSSTR_QUOTED ? B_TRUE : B_FALSE;
- char *buf;
- uint16_t chrval;
-
- if ((blen = MIN(*lenp, 256 * 1024)) == 0)
- return (0);
-
- buf = alloca(blen);
-
- if (read_heap_smi(&nstrchrs, addr, V8_OFF_STRING_LENGTH) != 0) {
- (void) bsnprintf(bufp, lenp,
- "<string (failed to read length)>");
- return (-1);
- }
-
- if (slicelen != -1)
- nstrchrs = slicelen;
-
- if ((flags & JSSTR_ISASCII) != 0) {
- nstrbytes = nstrchrs;
- nreadoffset = sliceoffset;
- } else {
- nstrbytes = 2 * nstrchrs;
- nreadoffset = 2 * sliceoffset;
- }
-
- nreadbytes = nstrbytes + sizeof ("\"\"") <= blen ? nstrbytes :
- blen - sizeof ("\"\"[...]");
-
- if (nreadbytes < 0) {
- /*
- * We don't even have the room to store the ellipsis; zero
- * the buffer out and set the length to zero.
- */
- *bufp = '\0';
- *lenp = 0;
- return (0);
- }
-
- if (verbose)
- mdb_printf("length: %d chars (%d bytes), "
- "will read %d bytes from offset %d\n",
- nstrchrs, nstrbytes, nreadbytes, nreadoffset);
-
- if (nstrbytes == 0) {
- (void) bsnprintf(bufp, lenp, "%s%s",
- quoted ? "\"" : "", quoted ? "\"" : "");
- return (0);
- }
-
- buf[0] = '\0';
-
- if ((flags & JSSTR_ISASCII) != 0) {
- if (mdb_readstr(buf, nreadbytes + 1,
- addr + V8_OFF_SEQASCIISTR_CHARS + nreadoffset) == -1) {
- v8_warn("failed to read SeqString data");
- return (-1);
- }
-
- if (nreadbytes != nstrbytes)
- (void) strlcat(buf, "[...]", blen);
-
- (void) bsnprintf(bufp, lenp, "%s%s%s",
- quoted ? "\"" : "", buf, quoted ? "\"" : "");
- } else {
- if (mdb_readstr(buf, nreadbytes,
- addr + V8_OFF_SEQTWOBYTESTR_CHARS + nreadoffset) == -1) {
- v8_warn("failed to read SeqTwoByteString data");
- return (-1);
- }
-
- (void) bsnprintf(bufp, lenp, "%s", quoted ? "\"" : "");
- for (i = 0; i < nreadbytes; i += 2) {
- /*LINTED*/
- chrval = *((uint16_t *)(buf + i));
- (void) bsnprintf(bufp, lenp, "%c",
- (isascii(chrval) || chrval == 0) ?
- (char)chrval : '?');
- }
- if (nreadbytes != nstrbytes)
- (void) bsnprintf(bufp, lenp, "[...]");
- (void) bsnprintf(bufp, lenp, "%s", quoted ? "\"" : "");
- }
-
- return (0);
-}
-
-static int
-jsstr_print_cons(uintptr_t addr, uint_t flags, char **bufp, size_t *lenp)
-{
- boolean_t verbose = flags & JSSTR_VERBOSE ? B_TRUE : B_FALSE;
- boolean_t quoted = flags & JSSTR_QUOTED ? B_TRUE : B_FALSE;
- uintptr_t ptr1, ptr2;
-
- if (read_heap_ptr(&ptr1, addr, V8_OFF_CONSSTRING_FIRST) != 0) {
- (void) bsnprintf(bufp, lenp,
- "<cons string (failed to read first)>");
- return (-1);
- }
-
- if (read_heap_ptr(&ptr2, addr, V8_OFF_CONSSTRING_SECOND) != 0) {
- (void) bsnprintf(bufp, lenp,
- "<cons string (failed to read second)>");
- return (-1);
- }
-
- if (verbose) {
- mdb_printf("ptr1: %p\n", ptr1);
- mdb_printf("ptr2: %p\n", ptr2);
- }
-
- if (quoted)
- (void) bsnprintf(bufp, lenp, "\"");
-
- flags = JSSTR_BUMPDEPTH(flags) & ~JSSTR_QUOTED;
-
- if (jsstr_print(ptr1, flags, bufp, lenp) != 0)
- return (-1);
-
- if (jsstr_print(ptr2, flags, bufp, lenp) != 0)
- return (-1);
-
- if (quoted)
- (void) bsnprintf(bufp, lenp, "\"");
-
- return (0);
-}
-
-static int
-jsstr_print_sliced(uintptr_t addr, uint_t flags, char **bufp, size_t *lenp)
-{
- uintptr_t parent, offset, length;
- uint8_t typebyte;
- boolean_t verbose = flags & JSSTR_VERBOSE ? B_TRUE : B_FALSE;
- boolean_t quoted = flags & JSSTR_QUOTED ? B_TRUE : B_FALSE;
-
- if (read_heap_ptr(&parent, addr, V8_OFF_SLICEDSTRING_PARENT) != 0) {
- (void) bsnprintf(bufp, lenp,
- "<sliced string (failed to read parent)>");
- return (-1);
- }
-
- if (read_heap_smi(&offset, addr, V8_OFF_SLICEDSTRING_OFFSET) != 0) {
- (void) bsnprintf(bufp, lenp,
- "<sliced string (failed to read offset)>");
- return (-1);
- }
-
- if (read_heap_smi(&length, addr, V8_OFF_STRING_LENGTH) != 0) {
- (void) bsnprintf(bufp, lenp,
- "<sliced string (failed to read length)>");
- return (-1);
- }
-
- if (verbose)
- mdb_printf("parent: %p, offset = %d, length = %d\n",
- parent, offset, length);
-
- if (read_typebyte(&typebyte, parent) != 0) {
- (void) bsnprintf(bufp, lenp,
- "<sliced string (failed to read parent type)>");
- return (0);
- }
-
- if (!V8_STRREP_SEQ(typebyte)) {
- (void) bsnprintf(bufp, lenp,
- "<sliced string (parent is not a sequential string)>");
- return (0);
- }
-
- if (quoted)
- (void) bsnprintf(bufp, lenp, "\"");
-
- flags = JSSTR_BUMPDEPTH(flags) & ~JSSTR_QUOTED;
-
- if (V8_STRENC_ASCII(typebyte))
- flags |= JSSTR_ISASCII;
-
- if (jsstr_print_seq(parent, flags, bufp, lenp, offset, length) != 0)
- return (-1);
-
- if (quoted)
- (void) bsnprintf(bufp, lenp, "\"");
-
- return (0);
-}
-
-static int
-jsstr_print_external(uintptr_t addr, uint_t flags, char **bufp, size_t *lenp)
-{
- uintptr_t ptr1, ptr2;
- size_t blen = *lenp + 1;
- char *buf;
- boolean_t quoted = flags & JSSTR_QUOTED ? B_TRUE : B_FALSE;
- int rval = -1;
-
- if ((flags & JSSTR_ISASCII) == 0) {
- (void) bsnprintf(bufp, lenp, "<external two-byte string>");
- return (0);
- }
-
- if (flags & JSSTR_VERBOSE)
- mdb_printf("assuming Node.js string\n");
-
- if (read_heap_ptr(&ptr1, addr, V8_OFF_EXTERNALSTRING_RESOURCE) != 0) {
- (void) bsnprintf(bufp, lenp,
- "<external string (failed to read resource)>");
- return (-1);
- }
-
- if (mdb_vread(&ptr2, sizeof (ptr2),
- ptr1 + NODE_OFF_EXTSTR_DATA) == -1) {
- (void) bsnprintf(bufp, lenp, "<external string (failed to "
- "read node external pointer %p)>",
- ptr1 + NODE_OFF_EXTSTR_DATA);
- return (-1);
- }
-
- buf = mdb_alloc(blen, UM_SLEEP);
-
- if (mdb_readstr(buf, blen, ptr2) == -1) {
- (void) bsnprintf(bufp, lenp, "<external string "
- "(failed to read ExternalString data)>");
- goto out;
- }
-
- if (buf[0] != '\0' && !isascii(buf[0])) {
- (void) bsnprintf(bufp, lenp, "<external string "
- "(failed to read ExternalString ascii data)>");
- goto out;
- }
-
- (void) bsnprintf(bufp, lenp, "%s%s%s",
- quoted ? "\"" : "", buf, quoted ? "\"" : "");
-
- rval = 0;
-out:
- mdb_free(buf, blen);
-
- return (rval);
-}
-
-/*
- * Returns true if the given address refers to the named oddball object (e.g.
- * "undefined"). Returns false on failure (since we shouldn't fail on the
- * actual "undefined" value).
- */
-static boolean_t
-jsobj_is_oddball(uintptr_t addr, char *oddball)
-{
- uint8_t type;
- uintptr_t strptr;
- const char *typename;
- char buf[16];
- char *bufp = buf;
- size_t len = sizeof (buf);
-
- v8_silent++;
-
- if (read_typebyte(&type, addr) != 0) {
- v8_silent--;
- return (B_FALSE);
- }
-
- v8_silent--;
- typename = enum_lookup_str(v8_types, type, "<unknown>");
- if (strcmp(typename, "Oddball") != 0)
- return (B_FALSE);
-
- if (read_heap_ptr(&strptr, addr, V8_OFF_ODDBALL_TO_STRING) == -1)
- return (B_FALSE);
-
- if (jsstr_print(strptr, JSSTR_NUDE, &bufp, &len) != 0)
- return (B_FALSE);
-
- return (strcmp(buf, oddball) == 0);
-}
-
-static boolean_t
-jsobj_is_undefined(uintptr_t addr)
-{
- return (jsobj_is_oddball(addr, "undefined"));
-}
-
-static boolean_t
-jsobj_is_hole(uintptr_t addr)
-{
- return (jsobj_is_oddball(addr, "hole"));
-}
-
-static int
-jsobj_properties(uintptr_t addr,
- int (*func)(const char *, uintptr_t, void *), void *arg)
-{
- uintptr_t ptr, map, elements;
- uintptr_t *props = NULL, *descs = NULL, *content = NULL, *trans, *elts;
- size_t size, nprops, ndescs, ncontent, ntrans, len;
- ssize_t ii, rndescs;
- uint8_t type, ninprops;
- int rval = -1;
- size_t ps = sizeof (uintptr_t);
- ssize_t off;
-
- /*
- * Objects have either "fast" properties represented with a FixedArray
- * or slow properties represented with a Dictionary.
- */
- if (mdb_vread(&ptr, ps, addr + V8_OFF_JSOBJECT_PROPERTIES) == -1)
- return (-1);
-
- if (read_typebyte(&type, ptr) != 0)
- return (-1);
-
- if (type != V8_TYPE_FIXEDARRAY) {
- /*
- * If our properties aren't a fixed array, we'll emit a member
- * that contains the type name, but with a NULL value.
- */
- char buf[256];
-
- (void) mdb_snprintf(buf, sizeof (buf), "<%s>",
- enum_lookup_str(v8_types, type, "unknown"));
-
- return (func(buf, NULL, arg));
- }
-
- /*
- * To iterate the properties, we need to examine the instance
- * descriptors of the associated Map object. Depending on the version
- * of V8, this might be found directly from the map -- or indirectly
- * via the transitions array.
- */
- if (mdb_vread(&map, ps, addr + V8_OFF_HEAPOBJECT_MAP) == -1)
- goto err;
-
- /*
- * Check to see if our elements member is an array and non-zero; if
- * so, it contains numerically-named properties.
- */
- if (V8_ELEMENTS_KIND_SHIFT != -1 &&
- read_heap_ptr(&elements, addr, V8_OFF_JSOBJECT_ELEMENTS) == 0 &&
- read_heap_array(elements, &elts, &len, UM_SLEEP) == 0 && len != 0) {
- uint8_t bit_field2, kind;
- size_t sz = len * sizeof (uintptr_t);
-
- if (mdb_vread(&bit_field2, sizeof (bit_field2),
- map + V8_OFF_MAP_BIT_FIELD2) == -1) {
- mdb_free(elts, sz);
- goto err;
- }
-
- kind = bit_field2 >> V8_ELEMENTS_KIND_SHIFT;
- kind &= (1 << V8_ELEMENTS_KIND_BITCOUNT) - 1;
-
- if (kind == V8_ELEMENTS_FAST_ELEMENTS ||
- kind == V8_ELEMENTS_FAST_HOLEY_ELEMENTS) {
- for (ii = 0; ii < len; ii++) {
- char name[10];
-
- if (kind == V8_ELEMENTS_FAST_HOLEY_ELEMENTS &&
- jsobj_is_hole(elts[ii]))
- continue;
-
- snprintf(name, sizeof (name), "%d", ii);
-
- if (func(name, elts[ii], arg) != 0) {
- mdb_free(elts, sz);
- goto err;
- }
- }
- } else if (kind == V8_ELEMENTS_DICTIONARY_ELEMENTS) {
- if (read_heap_dict(elements, func, arg) != 0) {
- mdb_free(elts, sz);
- goto err;
- }
- }
-
- mdb_free(elts, sz);
- }
-
- if (V8_DICT_SHIFT != -1) {
- uintptr_t bit_field3;
-
- if (mdb_vread(&bit_field3, sizeof (bit_field3),
- map + V8_OFF_MAP_BIT_FIELD3) == -1)
- goto err;
-
- if (V8_SMI_VALUE(bit_field3) & (1 << V8_DICT_SHIFT))
- return (read_heap_dict(ptr, func, arg));
- } else if (V8_OFF_MAP_INSTANCE_DESCRIPTORS != -1) {
- uintptr_t bit_field3;
-
- if (mdb_vread(&bit_field3, sizeof (bit_field3),
- map + V8_OFF_MAP_INSTANCE_DESCRIPTORS) == -1)
- goto err;
-
- if (V8_SMI_VALUE(bit_field3) == (1 << V8_ISSHARED_SHIFT)) {
- /*
- * On versions of V8 prior to that used in 0.10,
- * the instance descriptors were overloaded to also
- * be bit_field3 -- and there was no way from that
- * field to infer a dictionary type. Because we
- * can't determine if the map is actually the
- * hash_table_map, we assume that if it's an object
- * that has kIsShared set, that it is in fact a
- * dictionary -- an assumption that is assuredly in
- * error in some cases.
- */
- return (read_heap_dict(ptr, func, arg));
- }
- }
-
- if (read_heap_array(ptr, &props, &nprops, UM_SLEEP) != 0)
- goto err;
-
- if ((off = V8_OFF_MAP_INSTANCE_DESCRIPTORS) == -1) {
- if (V8_OFF_MAP_TRANSITIONS == -1 ||
- V8_TRANSITIONS_IDX_DESC == -1 ||
- V8_PROP_IDX_CONTENT != -1) {
- mdb_warn("missing instance_descriptors, but did "
- "not find expected transitions array metadata; "
- "cannot read properties\n");
- goto err;
- }
-
- off = V8_OFF_MAP_TRANSITIONS;
- }
-
- if (mdb_vread(&ptr, ps, map + off) == -1)
- goto err;
-
- if (V8_OFF_MAP_INSTANCE_DESCRIPTORS == -1) {
- if (read_heap_array(ptr, &trans, &ntrans, UM_SLEEP) != 0)
- goto err;
-
- ptr = trans[V8_TRANSITIONS_IDX_DESC];
- mdb_free(trans, ntrans * sizeof (uintptr_t));
- }
-
- if (read_heap_array(ptr, &descs, &ndescs, UM_SLEEP) != 0)
- goto err;
-
- if (read_size(&size, addr) != 0)
- size = 0;
-
- if (mdb_vread(&ninprops, 1, map + V8_OFF_MAP_INOBJECT_PROPERTIES) == -1)
- goto err;
-
- if (V8_PROP_IDX_CONTENT != -1 && V8_PROP_IDX_CONTENT < ndescs &&
- read_heap_array(descs[V8_PROP_IDX_CONTENT], &content,
- &ncontent, UM_SLEEP) != 0)
- goto err;
-
- if (V8_PROP_IDX_CONTENT == -1) {
- /*
- * On node v0.8 and later, the content is not stored in an
- * orthogonal FixedArray, but rather with the descriptors.
- */
- content = descs;
- ncontent = ndescs;
- rndescs = ndescs > V8_PROP_IDX_FIRST ?
- (ndescs - V8_PROP_IDX_FIRST) / V8_PROP_DESC_SIZE : 0;
- } else {
- rndescs = ndescs - V8_PROP_IDX_FIRST;
- }
-
- for (ii = 0; ii < rndescs; ii++) {
- uintptr_t keyidx, validx, detidx, baseidx;
- char buf[1024];
- intptr_t val;
- size_t len = sizeof (buf);
- char *c = buf;
-
- if (V8_PROP_IDX_CONTENT != -1) {
- /*
- * In node versions prior to v0.8, this was hardcoded
- * in the V8 implementation, so we hardcode it here
- * as well.
- */
- keyidx = ii + V8_PROP_IDX_FIRST;
- validx = ii << 1;
- detidx = (ii << 1) + 1;
- } else {
- baseidx = V8_PROP_IDX_FIRST + (ii * V8_PROP_DESC_SIZE);
- keyidx = baseidx + V8_PROP_DESC_KEY;
- validx = baseidx + V8_PROP_DESC_VALUE;
- detidx = baseidx + V8_PROP_DESC_DETAILS;
- }
-
- if (detidx >= ncontent) {
- v8_warn("property descriptor %d: detidx (%d) "
- "out of bounds for content array (length %d)\n",
- ii, detidx, ncontent);
- continue;
- }
-
- if (!V8_DESC_ISFIELD(content[detidx]))
- continue;
-
- if (keyidx >= ndescs) {
- v8_warn("property descriptor %d: keyidx (%d) "
- "out of bounds for descriptor array (length %d)\n",
- ii, keyidx, ndescs);
- continue;
- }
-
- if (jsstr_print(descs[keyidx], JSSTR_NUDE, &c, &len) != 0)
- continue;
-
- val = (intptr_t)content[validx];
-
- if (!V8_IS_SMI(val)) {
- v8_warn("object %p: property descriptor %d: value "
- "index value is not an SMI: %p\n", addr, ii, val);
- continue;
- }
-
- val = V8_SMI_VALUE(val) - ninprops;
-
- if (val < 0) {
- /* property is stored directly in the object */
- if (mdb_vread(&ptr, sizeof (ptr), addr + V8_OFF_HEAP(
- size + val * sizeof (uintptr_t))) == -1) {
- v8_warn("object %p: failed to read in-object "
- "property at %p\n", addr, addr +
- V8_OFF_HEAP(size + val *
- sizeof (uintptr_t)));
- continue;
- }
- } else {
- /* property should be in "props" array */
- if (val >= nprops) {
- /*
- * This can happen when properties are deleted.
- * If this value isn't obviously corrupt, we'll
- * just silently ignore it.
- */
- if (val < rndescs)
- continue;
-
- v8_warn("object %p: property descriptor %d: "
- "value index value (%d) out of bounds "
- "(%d)\n", addr, ii, val, nprops);
- goto err;
- }
-
- ptr = props[val];
- }
-
- if (func(buf, ptr, arg) != 0)
- goto err;
- }
-
- rval = 0;
-err:
- if (props != NULL)
- mdb_free(props, nprops * sizeof (uintptr_t));
-
- if (descs != NULL)
- mdb_free(descs, ndescs * sizeof (uintptr_t));
-
- if (content != NULL && V8_PROP_IDX_CONTENT != -1)
- mdb_free(content, ncontent * sizeof (uintptr_t));
-
- return (rval);
-}
-
-/*
- * Given the line endings table in "lendsp", computes the line number for the
- * given token position and print the result into "buf". If "lendsp" is
- * undefined, prints the token position instead.
- */
-static int
-jsfunc_lineno(uintptr_t lendsp, uintptr_t tokpos,
- char *buf, size_t buflen, int *lineno)
-{
- uintptr_t size, bufsz, lower, upper, ii = 0;
- uintptr_t *data;
-
- if (lineno != NULL)
- *lineno = -1;
-
- if (jsobj_is_undefined(lendsp)) {
- /*
- * The token position is an SMI, but it comes in as its raw
- * value so we can more easily compare it to values in the line
- * endings table. If we're just printing the position directly,
- * we must convert it here.
- */
- mdb_snprintf(buf, buflen, "position %d", V8_SMI_VALUE(tokpos));
-
- if (lineno != NULL)
- *lineno = 0;
-
- return (0);
- }
-
- if (read_heap_smi(&size, lendsp, V8_OFF_FIXEDARRAY_LENGTH) != 0)
- return (-1);
-
- bufsz = size * sizeof (data[0]);
-
- if ((data = mdb_alloc(bufsz, UM_NOSLEEP)) == NULL) {
- v8_warn("failed to alloc %d bytes for FixedArray data", bufsz);
- return (-1);
- }
-
- if (mdb_vread(data, bufsz, lendsp + V8_OFF_FIXEDARRAY_DATA) != bufsz) {
- v8_warn("failed to read FixedArray data");
- mdb_free(data, bufsz);
- return (-1);
- }
-
- lower = 0;
- upper = size - 1;
-
- if (tokpos > data[upper]) {
- (void) strlcpy(buf, "position out of range", buflen);
- mdb_free(data, bufsz);
-
- if (lineno != NULL)
- *lineno = 0;
-
- return (0);
- }
-
- if (tokpos <= data[0]) {
- (void) strlcpy(buf, "line 1", buflen);
- mdb_free(data, bufsz);
-
- if (lineno != NULL)
- *lineno = 1;
-
- return (0);
- }
-
- while (upper >= 1) {
- ii = (lower + upper) >> 1;
- if (tokpos > data[ii])
- lower = ii + 1;
- else if (tokpos <= data[ii - 1])
- upper = ii - 1;
- else
- break;
- }
-
- if (lineno != NULL)
- *lineno = ii + 1;
-
- (void) mdb_snprintf(buf, buflen, "line %d", ii + 1);
- mdb_free(data, bufsz);
- return (0);
-}
-
-/*
- * Given a Script object, prints nlines on either side of lineno, with each
- * line prefixed by prefix (if non-NULL).
- */
-static void
-jsfunc_lines(uintptr_t scriptp,
- uintptr_t start, uintptr_t end, int nlines, char *prefix)
-{
- uintptr_t src;
- char *buf, *bufp;
- size_t bufsz = 1024, len;
- int i, line, slop = 10;
- boolean_t newline = B_TRUE;
- int startline = -1, endline = -1;
-
- if (read_heap_ptr(&src, scriptp, V8_OFF_SCRIPT_SOURCE) != 0)
- return;
-
- for (;;) {
- if ((buf = mdb_zalloc(bufsz, UM_NOSLEEP)) == NULL) {
- mdb_warn("failed to allocate source code "
- "buffer of size %d", bufsz);
- return;
- }
-
- bufp = buf;
- len = bufsz;
-
- if (jsstr_print(src, JSSTR_NUDE, &bufp, &len) != 0) {
- mdb_free(buf, bufsz);
- return;
- }
-
- if (len > slop)
- break;
-
- mdb_free(buf, bufsz);
- bufsz <<= 1;
- }
-
- if (end >= bufsz)
- return;
-
- /*
- * First, take a pass to determine where our lines actually start.
- */
- for (i = 0, line = 1; buf[i] != '\0'; i++) {
- if (buf[i] == '\n')
- line++;
-
- if (i == start)
- startline = line;
-
- if (i == end) {
- endline = line;
- break;
- }
- }
-
- if (startline == -1 || endline == -1) {
- mdb_warn("for script %p, could not determine startline/endline"
- " (start %ld, end %ld, nlines %d)",
- scriptp, start, end, nlines);
- mdb_free(buf, bufsz);
- return;
- }
-
- for (i = 0, line = 1; buf[i] != '\0'; i++) {
- if (buf[i] == '\n') {
- line++;
- newline = B_TRUE;
- }
-
- if (line < startline - nlines)
- continue;
-
- if (line > endline + nlines)
- break;
-
- mdb_printf("%c", buf[i]);
-
- if (newline) {
- if (line >= startline && line <= endline)
- mdb_printf("%<b>");
-
- if (prefix != NULL)
- mdb_printf(prefix, line);
-
- if (line >= startline && line <= endline)
- mdb_printf("%</b>");
-
- newline = B_FALSE;
- }
- }
-
- mdb_printf("\n");
-
- if (line == endline)
- mdb_printf("%</b>");
-
- mdb_free(buf, bufsz);
-}
-
-/*
- * Given a SharedFunctionInfo object, prints into bufp a name of the function
- * suitable for printing. This function attempts to infer a name for anonymous
- * functions.
- */
-static int
-jsfunc_name(uintptr_t funcinfop, char **bufp, size_t *lenp)
-{
- uintptr_t ptrp;
- char *bufs = *bufp;
-
- if (read_heap_ptr(&ptrp, funcinfop,
- V8_OFF_SHAREDFUNCTIONINFO_NAME) != 0) {
- (void) bsnprintf(bufp, lenp,
- "<function (failed to read SharedFunctionInfo)>");
- return (-1);
- }
-
- if (jsstr_print(ptrp, JSSTR_NUDE, bufp, lenp) != 0)
- return (-1);
-
- if (*bufp != bufs)
- return (0);
-
- if (read_heap_ptr(&ptrp, funcinfop,
- V8_OFF_SHAREDFUNCTIONINFO_INFERRED_NAME) != 0) {
- (void) bsnprintf(bufp, lenp, "<anonymous>");
- return (0);
- }
-
- (void) bsnprintf(bufp, lenp, "<anonymous> (as ");
- bufs = *bufp;
-
- if (jsstr_print(ptrp, JSSTR_NUDE, bufp, lenp) != 0)
- return (-1);
-
- if (*bufp == bufs)
- (void) bsnprintf(bufp, lenp, "<anon>");
-
- (void) bsnprintf(bufp, lenp, ")");
-
- return (0);
-}
-
-/*
- * JavaScript-level object printing
- */
-typedef struct jsobj_print {
- char **jsop_bufp;
- size_t *jsop_lenp;
- int jsop_indent;
- uint64_t jsop_depth;
- boolean_t jsop_printaddr;
- uintptr_t jsop_baseaddr;
- int jsop_nprops;
- const char *jsop_member;
- boolean_t jsop_found;
- boolean_t jsop_descended;
-} jsobj_print_t;
-
-static int jsobj_print_number(uintptr_t, jsobj_print_t *);
-static int jsobj_print_oddball(uintptr_t, jsobj_print_t *);
-static int jsobj_print_jsobject(uintptr_t, jsobj_print_t *);
-static int jsobj_print_jsarray(uintptr_t, jsobj_print_t *);
-static int jsobj_print_jsfunction(uintptr_t, jsobj_print_t *);
-static int jsobj_print_jsdate(uintptr_t, jsobj_print_t *);
-
-static int
-jsobj_print(uintptr_t addr, jsobj_print_t *jsop)
-{
- uint8_t type;
- const char *klass;
- char **bufp = jsop->jsop_bufp;
- size_t *lenp = jsop->jsop_lenp;
-
- const struct {
- char *name;
- int (*func)(uintptr_t, jsobj_print_t *);
- } table[] = {
- { "HeapNumber", jsobj_print_number },
- { "Oddball", jsobj_print_oddball },
- { "JSObject", jsobj_print_jsobject },
- { "JSArray", jsobj_print_jsarray },
- { "JSFunction", jsobj_print_jsfunction },
- { "JSDate", jsobj_print_jsdate },
- { NULL }
- }, *ent;
-
- if (jsop->jsop_baseaddr != NULL && jsop->jsop_member == NULL)
- (void) bsnprintf(bufp, lenp, "%p: ", jsop->jsop_baseaddr);
-
- if (jsop->jsop_printaddr && jsop->jsop_member == NULL)
- (void) bsnprintf(bufp, lenp, "%p: ", addr);
-
- if (V8_IS_SMI(addr)) {
- (void) bsnprintf(bufp, lenp, "%d", V8_SMI_VALUE(addr));
- return (0);
- }
-
- if (!V8_IS_HEAPOBJECT(addr)) {
- (void) bsnprintf(bufp, lenp, "<not a heap object>");
- return (-1);
- }
-
- if (read_typebyte(&type, addr) != 0) {
- (void) bsnprintf(bufp, lenp, "<couldn't read type>");
- return (-1);
- }
-
- if (V8_TYPE_STRING(type)) {
- if (jsstr_print(addr, JSSTR_QUOTED, bufp, lenp) == -1)
- return (-1);
-
- return (0);
- }
-
- klass = enum_lookup_str(v8_types, type, "<unknown>");
-
- for (ent = &table[0]; ent->name != NULL; ent++) {
- if (strcmp(klass, ent->name) == 0) {
- jsop->jsop_descended = B_TRUE;
- return (ent->func(addr, jsop));
- }
- }
-
- (void) bsnprintf(bufp, lenp,
- "<unknown JavaScript object type \"%s\">", klass);
- return (-1);
-}
-
-static int
-jsobj_print_number(uintptr_t addr, jsobj_print_t *jsop)
-{
- char **bufp = jsop->jsop_bufp;
- size_t *lenp = jsop->jsop_lenp;
- double numval;
-
- if (read_heap_double(&numval, addr, V8_OFF_HEAPNUMBER_VALUE) == -1)
- return (-1);
-
- if (numval == (long long)numval)
- (void) bsnprintf(bufp, lenp, "%lld", (long long)numval);
- else
- (void) bsnprintf(bufp, lenp, "%e", numval);
-
- return (0);
-}
-
-static int
-jsobj_print_oddball(uintptr_t addr, jsobj_print_t *jsop)
-{
- char **bufp = jsop->jsop_bufp;
- size_t *lenp = jsop->jsop_lenp;
- uintptr_t strptr;
-
- if (read_heap_ptr(&strptr, addr, V8_OFF_ODDBALL_TO_STRING) != 0)
- return (-1);
-
- return (jsstr_print(strptr, JSSTR_NUDE, bufp, lenp));
-}
-
-static int
-jsobj_print_prop(const char *desc, uintptr_t val, void *arg)
-{
- jsobj_print_t *jsop = arg, descend;
- char **bufp = jsop->jsop_bufp;
- size_t *lenp = jsop->jsop_lenp;
-
- (void) bsnprintf(bufp, lenp, "%s\n%*s%s: ", jsop->jsop_nprops == 0 ?
- "{" : "", jsop->jsop_indent + 4, "", desc);
-
- descend = *jsop;
- descend.jsop_depth--;
- descend.jsop_indent += 4;
-
- (void) jsobj_print(val, &descend);
- (void) bsnprintf(bufp, lenp, ",");
-
- jsop->jsop_nprops++;
-
- return (0);
-}
-
-static int
-jsobj_print_prop_member(const char *desc, uintptr_t val, void *arg)
-{
- jsobj_print_t *jsop = arg, descend;
- const char *member = jsop->jsop_member, *next = member;
- int rv;
-
- for (; *next != '\0' && *next != '.' && *next != '['; next++)
- continue;
-
- if (*member == '[') {
- mdb_warn("cannot use array indexing on an object\n");
- return (-1);
- }
-
- if (strncmp(member, desc, next - member) != 0)
- return (0);
-
- if (desc[next - member] != '\0')
- return (0);
-
- /*
- * This property matches the desired member; descend.
- */
- descend = *jsop;
-
- if (*next == '\0') {
- descend.jsop_member = NULL;
- descend.jsop_found = B_TRUE;
- } else {
- descend.jsop_member = *next == '.' ? next + 1 : next;
- }
-
- rv = jsobj_print(val, &descend);
- jsop->jsop_found = descend.jsop_found;
-
- return (rv);
-}
-
-static int
-jsobj_print_jsobject(uintptr_t addr, jsobj_print_t *jsop)
-{
- char **bufp = jsop->jsop_bufp;
- size_t *lenp = jsop->jsop_lenp;
-
- if (jsop->jsop_member != NULL)
- return (jsobj_properties(addr, jsobj_print_prop_member, jsop));
-
- if (jsop->jsop_depth == 0) {
- (void) bsnprintf(bufp, lenp, "[...]");
- return (0);
- }
-
- jsop->jsop_nprops = 0;
-
- if (jsobj_properties(addr, jsobj_print_prop, jsop) != 0)
- return (-1);
-
- if (jsop->jsop_nprops > 0) {
- (void) bsnprintf(bufp, lenp, "\n%*s", jsop->jsop_indent, "");
- } else if (jsop->jsop_nprops == 0) {
- (void) bsnprintf(bufp, lenp, "{");
- } else {
- (void) bsnprintf(bufp, lenp, "{ /* unknown property */ ");
- }
-
- (void) bsnprintf(bufp, lenp, "}");
-
- return (0);
-}
-
-static int
-jsobj_print_jsarray_member(uintptr_t addr, jsobj_print_t *jsop)
-{
- uintptr_t *elts;
- jsobj_print_t descend;
- uintptr_t ptr;
- const char *member = jsop->jsop_member, *end, *p;
- size_t elt = 0, place = 1, len, rv;
- char **bufp = jsop->jsop_bufp;
- size_t *lenp = jsop->jsop_lenp;
-
- if (read_heap_ptr(&ptr, addr, V8_OFF_JSOBJECT_ELEMENTS) != 0) {
- (void) bsnprintf(bufp, lenp,
- "<array member (failed to read elements)>");
- return (-1);
- }
-
- if (read_heap_array(ptr, &elts, &len, UM_SLEEP | UM_GC) != 0) {
- (void) bsnprintf(bufp, lenp,
- "<array member (failed to read array)>");
- return (-1);
- }
-
- if (*member != '[') {
- mdb_warn("expected bracketed array index; "
- "found '%s'\n", member);
- return (-1);
- }
-
- if ((end = strchr(member, ']')) == NULL) {
- mdb_warn("missing array index terminator\n");
- return (-1);
- }
-
- /*
- * We know where our array index ends; convert it to an integer
- * by stepping through it from least significant digit to most.
- */
- for (p = end - 1; p > member; p--) {
- if (*p < '0' || *p > '9') {
- mdb_warn("illegal array index at '%c'\n", *p);
- return (-1);
- }
-
- elt += (*p - '0') * place;
- place *= 10;
- }
-
- if (place == 1) {
- mdb_warn("missing array index\n");
- return (-1);
- }
-
- if (elt >= len) {
- mdb_warn("array index %d exceeds size of %d\n", elt, len);
- return (-1);
- }
-
- descend = *jsop;
-
- switch (*(++end)) {
- case '\0':
- descend.jsop_member = NULL;
- descend.jsop_found = B_TRUE;
- break;
-
- case '.':
- descend.jsop_member = end + 1;
- break;
-
- case '[':
- descend.jsop_member = end;
- break;
-
- default:
- mdb_warn("illegal character '%c' following "
- "array index terminator\n", *end);
- return (-1);
- }
-
- rv = jsobj_print(elts[elt], &descend);
- jsop->jsop_found = descend.jsop_found;
-
- return (rv);
-}
-
-static int
-jsobj_print_jsarray(uintptr_t addr, jsobj_print_t *jsop)
-{
- char **bufp = jsop->jsop_bufp;
- size_t *lenp = jsop->jsop_lenp;
- int indent = jsop->jsop_indent;
- jsobj_print_t descend;
- uintptr_t ptr;
- uintptr_t *elts;
- size_t ii, len;
-
- if (jsop->jsop_member != NULL)
- return (jsobj_print_jsarray_member(addr, jsop));
-
- if (jsop->jsop_depth == 0) {
- (void) bsnprintf(bufp, lenp, "[...]");
- return (0);
- }
-
- if (read_heap_ptr(&ptr, addr, V8_OFF_JSOBJECT_ELEMENTS) != 0) {
- (void) bsnprintf(bufp, lenp,
- "<array (failed to read elements)>");
- return (-1);
- }
-
- if (read_heap_array(ptr, &elts, &len, UM_SLEEP | UM_GC) != 0) {
- (void) bsnprintf(bufp, lenp, "<array (failed to read array)>");
- return (-1);
- }
-
- if (len == 0) {
- (void) bsnprintf(bufp, lenp, "[]");
- return (0);
- }
-
- descend = *jsop;
- descend.jsop_depth--;
- descend.jsop_indent += 4;
-
- if (len == 1) {
- (void) bsnprintf(bufp, lenp, "[ ");
- (void) jsobj_print(elts[0], &descend);
- (void) bsnprintf(bufp, lenp, " ]");
- return (0);
- }
-
- (void) bsnprintf(bufp, lenp, "[\n");
-
- for (ii = 0; ii < len && *lenp > 0; ii++) {
- (void) bsnprintf(bufp, lenp, "%*s", indent + 4, "");
- (void) jsobj_print(elts[ii], &descend);
- (void) bsnprintf(bufp, lenp, ",\n");
- }
-
- (void) bsnprintf(bufp, lenp, "%*s", indent, "");
- (void) bsnprintf(bufp, lenp, "]");
-
- return (0);
-}
-
-static int
-jsobj_print_jsfunction(uintptr_t addr, jsobj_print_t *jsop)
-{
- char **bufp = jsop->jsop_bufp;
- size_t *lenp = jsop->jsop_lenp;
- uintptr_t shared;
-
- if (read_heap_ptr(&shared, addr, V8_OFF_JSFUNCTION_SHARED) != 0)
- return (-1);
-
- (void) bsnprintf(bufp, lenp, "function ");
- return (jsfunc_name(shared, bufp, lenp) != 0);
-}
-
-static int
-jsobj_print_jsdate(uintptr_t addr, jsobj_print_t *jsop)
-{
- char **bufp = jsop->jsop_bufp;
- size_t *lenp = jsop->jsop_lenp;
- char buf[128];
- uintptr_t value;
- uint8_t type;
- double numval;
-
- if (V8_OFF_JSDATE_VALUE == -1) {
- (void) bsnprintf(bufp, lenp, "<JSDate>", buf);
- return (0);
- }
-
- if (read_heap_ptr(&value, addr, V8_OFF_JSDATE_VALUE) != 0) {
- (void) bsnprintf(bufp, lenp, "<JSDate (failed to read value)>");
- return (-1);
- }
-
- if (read_typebyte(&type, value) != 0) {
- (void) bsnprintf(bufp, lenp, "<JSDate (failed to read type)>");
- return (-1);
- }
-
- if (strcmp(enum_lookup_str(v8_types, type, ""), "HeapNumber") != 0)
- return (-1);
-
- if (read_heap_double(&numval, value, V8_OFF_HEAPNUMBER_VALUE) == -1) {
- (void) bsnprintf(bufp, lenp, "<JSDate (failed to read num)>");
- return (-1);
- }
-
- mdb_snprintf(buf, sizeof (buf), "%Y",
- (time_t)((long long)numval / MILLISEC));
- (void) bsnprintf(bufp, lenp, "%lld (%s)", (long long)numval, buf);
-
- return (0);
-}
-
-/*
- * dcmd implementations
- */
-
-/* ARGSUSED */
-static int
-dcmd_v8classes(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
-{
- v8_class_t *clp;
-
- for (clp = v8_classes; clp != NULL; clp = clp->v8c_next)
- mdb_printf("%s\n", clp->v8c_name);
-
- return (DCMD_OK);
-}
-
-static int
-do_v8code(uintptr_t addr, boolean_t opt_d)
-{
- uintptr_t instrlen;
- ssize_t instroff = V8_OFF_CODE_INSTRUCTION_START;
-
- if (read_heap_ptr(&instrlen, addr, V8_OFF_CODE_INSTRUCTION_SIZE) != 0)
- return (DCMD_ERR);
-
- mdb_printf("code: %p\n", addr);
- mdb_printf("instructions: [%p, %p)\n", addr + instroff,
- addr + instroff + instrlen);
-
- if (!opt_d)
- return (DCMD_OK);
-
- mdb_set_dot(addr + instroff);
-
- do {
- (void) mdb_inc_indent(8); /* gets reset by mdb_eval() */
-
- /*
- * This is absolutely awful. We want to disassemble the above
- * range of instructions. Because we don't know how many there
- * are, we can't use "::dis". We resort to evaluating "./i",
- * but then we need to advance "." by the size of the
- * instruction just printed. The only way to do that is by
- * printing out "+", but we don't want that to show up, so we
- * redirect it to /dev/null.
- */
- if (mdb_eval("/i") != 0 ||
- mdb_eval("+=p ! cat > /dev/null") != 0) {
- (void) mdb_dec_indent(8);
- v8_warn("failed to disassemble at %p", mdb_get_dot());
- return (DCMD_ERR);
- }
- } while (mdb_get_dot() < addr + instroff + instrlen);
-
- (void) mdb_dec_indent(8);
- return (DCMD_OK);
-}
-
-/* ARGSUSED */
-static int
-dcmd_v8code(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
-{
- boolean_t opt_d = B_FALSE;
-
- if (mdb_getopts(argc, argv, 'd', MDB_OPT_SETBITS, B_TRUE, &opt_d,
- NULL) != argc)
- return (DCMD_USAGE);
-
- return (do_v8code(addr, opt_d));
-}
-
-/* ARGSUSED */
-static int
-dcmd_v8function(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
-{
- uint8_t type;
- uintptr_t funcinfop, scriptp, lendsp, tokpos, namep, codep;
- char *bufp;
- size_t len;
- boolean_t opt_d = B_FALSE;
- char buf[512];
-
- if (mdb_getopts(argc, argv, 'd', MDB_OPT_SETBITS, B_TRUE, &opt_d,
- NULL) != argc)
- return (DCMD_USAGE);
-
- v8_warnings++;
-
- if (read_typebyte(&type, addr) != 0)
- goto err;
-
- if (strcmp(enum_lookup_str(v8_types, type, ""), "JSFunction") != 0) {
- v8_warn("%p is not an instance of JSFunction\n", addr);
- goto err;
- }
-
- if (read_heap_ptr(&funcinfop, addr, V8_OFF_JSFUNCTION_SHARED) != 0 ||
- read_heap_ptr(&tokpos, funcinfop,
- V8_OFF_SHAREDFUNCTIONINFO_FUNCTION_TOKEN_POSITION) != 0 ||
- read_heap_ptr(&scriptp, funcinfop,
- V8_OFF_SHAREDFUNCTIONINFO_SCRIPT) != 0 ||
- read_heap_ptr(&namep, scriptp, V8_OFF_SCRIPT_NAME) != 0 ||
- read_heap_ptr(&lendsp, scriptp, V8_OFF_SCRIPT_LINE_ENDS) != 0)
- goto err;
-
- bufp = buf;
- len = sizeof (buf);
- if (jsfunc_name(funcinfop, &bufp, &len) != 0)
- goto err;
-
- mdb_printf("%p: JSFunction: %s\n", addr, buf);
-
- bufp = buf;
- len = sizeof (buf);
- mdb_printf("defined at ");
-
- if (jsstr_print(namep, JSSTR_NUDE, &bufp, &len) == 0)
- mdb_printf("%s ", buf);
-
- if (jsfunc_lineno(lendsp, tokpos, buf, sizeof (buf), NULL) == 0)
- mdb_printf("%s", buf);
-
- mdb_printf("\n");
-
- if (read_heap_ptr(&codep,
- funcinfop, V8_OFF_SHAREDFUNCTIONINFO_CODE) != 0)
- goto err;
-
- v8_warnings--;
-
- return (do_v8code(codep, opt_d));
-
-err:
- v8_warnings--;
- return (DCMD_ERR);
-}
-
-/* ARGSUSED */
-static int
-dcmd_v8frametypes(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
-{
- enum_print(v8_frametypes);
- return (DCMD_OK);
-}
-
-static void
-dcmd_v8print_help(void)
-{
- mdb_printf(
- "Prints out \".\" (a V8 heap object) as an instance of its C++\n"
- "class. With no arguments, the appropriate class is detected\n"
- "automatically. The 'class' argument overrides this to print an\n"
- "object as an instance of the given class. The list of known\n"
- "classes can be viewed with ::jsclasses.");
-}
-
-/* ARGSUSED */
-static int
-dcmd_v8print(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
-{
- const char *rqclass;
- v8_class_t *clp;
- char *bufp;
- size_t len;
- uint8_t type;
- char buf[256];
-
- if (argc < 1) {
- /*
- * If no type was specified, determine it automatically.
- */
- bufp = buf;
- len = sizeof (buf);
- if (obj_jstype(addr, &bufp, &len, &type) != 0)
- return (DCMD_ERR);
-
- if (type == 0) {
- /* For SMI or Failure, just print out the type. */
- mdb_printf("%s\n", buf);
- return (DCMD_OK);
- }
-
- if ((rqclass = enum_lookup_str(v8_types, type, NULL)) == NULL) {
- v8_warn("object has unknown type\n");
- return (DCMD_ERR);
- }
- } else {
- if (argv[0].a_type != MDB_TYPE_STRING)
- return (DCMD_USAGE);
-
- rqclass = argv[0].a_un.a_str;
- }
-
- for (clp = v8_classes; clp != NULL; clp = clp->v8c_next) {
- if (strcmp(rqclass, clp->v8c_name) == 0)
- break;
- }
-
- if (clp == NULL) {
- v8_warn("unknown class '%s'\n", rqclass);
- return (DCMD_USAGE);
- }
-
- return (obj_print_class(addr, clp));
-}
-
-/* ARGSUSED */
-static int
-dcmd_v8type(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
-{
- char buf[64];
- char *bufp = buf;
- size_t len = sizeof (buf);
-
- if (obj_jstype(addr, &bufp, &len, NULL) != 0)
- return (DCMD_ERR);
-
- mdb_printf("0x%p: %s\n", addr, buf);
- return (DCMD_OK);
-}
-
-/* ARGSUSED */
-static int
-dcmd_v8types(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
-{
- enum_print(v8_types);
- return (DCMD_OK);
-}
-
-static int
-load_current_context(uintptr_t *fpp, uintptr_t *raddrp)
-{
- mdb_reg_t regfp, regip;
-
-#ifdef __amd64
- if (mdb_getareg(1, "rbp", ®fp) != 0 ||
- mdb_getareg(1, "rip", ®ip) != 0) {
-#else
-#ifdef __i386
- if (mdb_getareg(1, "ebp", ®fp) != 0 ||
- mdb_getareg(1, "eip", ®ip) != 0) {
-#else
-#error Unrecognized microprocessor
-#endif
-#endif
- v8_warn("failed to load current context");
- return (-1);
- }
-
- if (fpp != NULL)
- *fpp = (uintptr_t)regfp;
-
- if (raddrp != NULL)
- *raddrp = (uintptr_t)regip;
-
- return (0);
-}
-
-static int
-do_jsframe_special(uintptr_t fptr, uintptr_t raddr, char *prop)
-{
- uintptr_t ftype;
- const char *ftypename;
-
- /*
- * First see if this looks like a native frame rather than a JavaScript
- * frame. We check this by asking MDB to print the return address
- * symbolically. If that works, we assume this was NOT a V8 frame,
- * since those are never in the symbol table.
- */
- if (mdb_snprintf(NULL, 0, "%A", raddr) > 1) {
- if (prop != NULL)
- return (0);
-
- mdb_printf("%p %a\n", fptr, raddr);
- return (0);
- }
-
- /*
- * Figure out what kind of frame this is using the same algorithm as
- * V8's ComputeType function. First, look for an ArgumentsAdaptorFrame.
- */
- if (mdb_vread(&ftype, sizeof (ftype), fptr + V8_OFF_FP_CONTEXT) != -1 &&
- V8_IS_SMI(ftype) &&
- (ftypename = enum_lookup_str(v8_frametypes, V8_SMI_VALUE(ftype),
- NULL)) != NULL && strstr(ftypename, "ArgumentsAdaptor") != NULL) {
- if (prop != NULL)
- return (0);
-
- mdb_printf("%p %a <%s>\n", fptr, raddr, ftypename);
- return (0);
- }
-
- /*
- * Other special frame types are indicated by a marker.
- */
- if (mdb_vread(&ftype, sizeof (ftype), fptr + V8_OFF_FP_MARKER) != -1 &&
- V8_IS_SMI(ftype)) {
- if (prop != NULL)
- return (0);
-
- ftypename = enum_lookup_str(v8_frametypes, V8_SMI_VALUE(ftype),
- NULL);
-
- if (ftypename != NULL)
- mdb_printf("%p %a <%s>\n", fptr, raddr, ftypename);
- else
- mdb_printf("%p %a\n", fptr, raddr);
-
- return (0);
- }
-
- return (-1);
-}
-
-static int
-do_jsframe(uintptr_t fptr, uintptr_t raddr, boolean_t verbose,
- char *func, char *prop, uintptr_t nlines)
-{
- uintptr_t funcp, funcinfop, tokpos, endpos, scriptp, lendsp, ptrp;
- uintptr_t ii, nargs;
- const char *typename;
- char *bufp;
- size_t len;
- uint8_t type;
- char buf[256];
- int lineno;
-
- /*
- * Check for non-JavaScript frames first.
- */
- if (func == NULL && do_jsframe_special(fptr, raddr, prop) == 0)
- return (DCMD_OK);
-
- /*
- * At this point we assume we're looking at a JavaScript frame. As with
- * native frames, fish the address out of the parent frame.
- */
- if (mdb_vread(&funcp, sizeof (funcp),
- fptr + V8_OFF_FP_FUNCTION) == -1) {
- v8_warn("failed to read stack at %p",
- fptr + V8_OFF_FP_FUNCTION);
- return (DCMD_ERR);
- }
-
- /*
- * Check if this thing is really a JSFunction at all. For some frames,
- * it's a Code object, presumably indicating some internal frame.
- */
- if (read_typebyte(&type, funcp) != 0 ||
- (typename = enum_lookup_str(v8_types, type, NULL)) == NULL) {
- if (func != NULL || prop != NULL)
- return (DCMD_OK);
-
- mdb_printf("%p %a\n", fptr, raddr);
- return (DCMD_OK);
- }
-
- if (strcmp("Code", typename) == 0) {
- if (func != NULL || prop != NULL)
- return (DCMD_OK);
-
- mdb_printf("%p %a internal (Code: %p)\n", fptr, raddr, funcp);
- return (DCMD_OK);
- }
-
- if (strcmp("JSFunction", typename) != 0) {
- if (func != NULL || prop != NULL)
- return (DCMD_OK);
-
- mdb_printf("%p %a unknown (%s: %p)", fptr, raddr, typename,
- funcp);
- return (DCMD_OK);
- }
-
- if (read_heap_ptr(&funcinfop, funcp, V8_OFF_JSFUNCTION_SHARED) != 0)
- return (DCMD_ERR);
-
- bufp = buf;
- len = sizeof (buf);
- if (jsfunc_name(funcinfop, &bufp, &len) != 0)
- return (DCMD_ERR);
-
- if (func != NULL && strcmp(buf, func) != 0)
- return (DCMD_OK);
-
- if (prop == NULL)
- mdb_printf("%p %a %s (%p)\n", fptr, raddr, buf, funcp);
-
- if (!verbose && prop == NULL)
- return (DCMD_OK);
-
- /*
- * Although the token position is technically an SMI, we're going to
- * byte-compare it to other SMI values so we don't want decode it here.
- */
- if (read_heap_ptr(&tokpos, funcinfop,
- V8_OFF_SHAREDFUNCTIONINFO_FUNCTION_TOKEN_POSITION) != 0)
- return (DCMD_ERR);
-
- if (read_heap_ptr(&scriptp, funcinfop,
- V8_OFF_SHAREDFUNCTIONINFO_SCRIPT) != 0)
- return (DCMD_ERR);
-
- if (read_heap_ptr(&ptrp, scriptp, V8_OFF_SCRIPT_NAME) != 0)
- return (DCMD_ERR);
-
- bufp = buf;
- len = sizeof (buf);
- (void) jsstr_print(ptrp, JSSTR_NUDE, &bufp, &len);
-
- if (prop != NULL && strcmp(prop, "file") == 0) {
- mdb_printf("%s\n", buf);
- return (DCMD_OK);
- }
-
- if (prop == NULL) {
- (void) mdb_inc_indent(4);
- mdb_printf("file: %s\n", buf);
- }
-
- if (read_heap_ptr(&lendsp, scriptp, V8_OFF_SCRIPT_LINE_ENDS) != 0)
- return (DCMD_ERR);
-
- if (read_heap_smi(&nargs, funcinfop,
- V8_OFF_SHAREDFUNCTIONINFO_LENGTH) == 0) {
- for (ii = 0; ii < nargs; ii++) {
- uintptr_t argptr;
- char arg[10];
-
- if (mdb_vread(&argptr, sizeof (argptr),
- fptr + V8_OFF_FP_ARGS + (nargs - ii - 1) *
- sizeof (uintptr_t)) == -1)
- continue;
-
- (void) snprintf(arg, sizeof (arg), "arg%d", ii + 1);
-
- if (prop != NULL) {
- if (strcmp(arg, prop) != 0)
- continue;
-
- mdb_printf("%p\n", argptr);
- return (DCMD_OK);
- }
-
- bufp = buf;
- len = sizeof (buf);
- (void) obj_jstype(argptr, &bufp, &len, NULL);
-
- mdb_printf("arg%d: %p (%s)\n", (ii + 1), argptr, buf);
- }
- }
-
- (void) jsfunc_lineno(lendsp, tokpos, buf, sizeof (buf), &lineno);
-
- if (prop != NULL) {
- if (strcmp(prop, "posn") == 0) {
- mdb_printf("%s\n", buf);
- return (DCMD_OK);
- }
-
- mdb_warn("unknown frame property '%s'\n", prop);
- return (DCMD_ERR);
- }
-
- mdb_printf("posn: %s", buf);
-
- if (nlines != 0 && read_heap_smi(&endpos, funcinfop,
- V8_OFF_SHAREDFUNCTIONINFO_END_POSITION) == 0) {
- jsfunc_lines(scriptp,
- V8_SMI_VALUE(tokpos), endpos, nlines, "%5d ");
- }
-
- mdb_printf("\n");
- (void) mdb_dec_indent(4);
-
- return (DCMD_OK);
-}
-
-typedef struct findjsobjects_prop {
- struct findjsobjects_prop *fjsp_next;
- char fjsp_desc[1];
-} findjsobjects_prop_t;
-
-typedef struct findjsobjects_instance {
- uintptr_t fjsi_addr;
- struct findjsobjects_instance *fjsi_next;
-} findjsobjects_instance_t;
-
-typedef struct findjsobjects_obj {
- findjsobjects_prop_t *fjso_props;
- findjsobjects_prop_t *fjso_last;
- size_t fjso_nprops;
- findjsobjects_instance_t fjso_instances;
- int fjso_ninstances;
- avl_node_t fjso_node;
- struct findjsobjects_obj *fjso_next;
- boolean_t fjso_malformed;
- char fjso_constructor[80];
-} findjsobjects_obj_t;
-
-typedef struct findjsobjects_stats {
- int fjss_heapobjs;
- int fjss_cached;
- int fjss_typereads;
- int fjss_jsobjs;
- int fjss_objects;
- int fjss_arrays;
- int fjss_uniques;
-} findjsobjects_stats_t;
-
-typedef struct findjsobjects_reference {
- uintptr_t fjsrf_addr;
- char *fjsrf_desc;
- size_t fjsrf_index;
- struct findjsobjects_reference *fjsrf_next;
-} findjsobjects_reference_t;
-
-typedef struct findjsobjects_referent {
- avl_node_t fjsr_node;
- uintptr_t fjsr_addr;
- findjsobjects_reference_t *fjsr_head;
- findjsobjects_reference_t *fjsr_tail;
- struct findjsobjects_referent *fjsr_next;
-} findjsobjects_referent_t;
-
-typedef struct findjsobjects_state {
- uintptr_t fjs_addr;
- uintptr_t fjs_size;
- boolean_t fjs_verbose;
- boolean_t fjs_brk;
- boolean_t fjs_allobjs;
- boolean_t fjs_initialized;
- boolean_t fjs_marking;
- boolean_t fjs_referred;
- avl_tree_t fjs_tree;
- avl_tree_t fjs_referents;
- findjsobjects_referent_t *fjs_head;
- findjsobjects_referent_t *fjs_tail;
- findjsobjects_obj_t *fjs_current;
- findjsobjects_obj_t *fjs_objects;
- findjsobjects_stats_t fjs_stats;
-} findjsobjects_state_t;
-
-findjsobjects_obj_t *
-findjsobjects_alloc(uintptr_t addr)
-{
- findjsobjects_obj_t *obj;
-
- obj = mdb_zalloc(sizeof (findjsobjects_obj_t), UM_SLEEP);
- obj->fjso_instances.fjsi_addr = addr;
- obj->fjso_ninstances = 1;
-
- return (obj);
-}
-
-void
-findjsobjects_free(findjsobjects_obj_t *obj)
-{
- findjsobjects_prop_t *prop, *next;
-
- for (prop = obj->fjso_props; prop != NULL; prop = next) {
- next = prop->fjsp_next;
- mdb_free(prop, sizeof (findjsobjects_prop_t) +
- strlen(prop->fjsp_desc));
- }
-
- mdb_free(obj, sizeof (findjsobjects_obj_t));
-}
-
-int
-findjsobjects_cmp(findjsobjects_obj_t *lhs, findjsobjects_obj_t *rhs)
-{
- findjsobjects_prop_t *lprop, *rprop;
- int rv;
-
- lprop = lhs->fjso_props;
- rprop = rhs->fjso_props;
-
- while (lprop != NULL && rprop != NULL) {
- if ((rv = strcmp(lprop->fjsp_desc, rprop->fjsp_desc)) != 0)
- return (rv > 0 ? 1 : -1);
-
- lprop = lprop->fjsp_next;
- rprop = rprop->fjsp_next;
- }
-
- if (lprop != NULL)
- return (1);
-
- if (rprop != NULL)
- return (-1);
-
- if (lhs->fjso_nprops > rhs->fjso_nprops)
- return (1);
-
- if (lhs->fjso_nprops < rhs->fjso_nprops)
- return (-1);
-
- rv = strcmp(lhs->fjso_constructor, rhs->fjso_constructor);
-
- return (rv < 0 ? -1 : rv > 0 ? 1 : 0);
-}
-
-int
-findjsobjects_cmp_referents(findjsobjects_referent_t *lhs,
- findjsobjects_referent_t *rhs)
-{
- if (lhs->fjsr_addr < rhs->fjsr_addr)
- return (-1);
-
- if (lhs->fjsr_addr > rhs->fjsr_addr)
- return (1);
-
- return (0);
-}
-
-int
-findjsobjects_cmp_ninstances(const void *l, const void *r)
-{
- findjsobjects_obj_t *lhs = *((findjsobjects_obj_t **)l);
- findjsobjects_obj_t *rhs = *((findjsobjects_obj_t **)r);
- size_t lprod = lhs->fjso_ninstances * lhs->fjso_nprops;
- size_t rprod = rhs->fjso_ninstances * rhs->fjso_nprops;
-
- if (lprod < rprod)
- return (-1);
-
- if (lprod > rprod)
- return (1);
-
- if (lhs->fjso_ninstances < rhs->fjso_ninstances)
- return (-1);
-
- if (lhs->fjso_ninstances > rhs->fjso_ninstances)
- return (1);
-
- if (lhs->fjso_nprops < rhs->fjso_nprops)
- return (-1);
-
- if (lhs->fjso_nprops > rhs->fjso_nprops)
- return (1);
-
- return (0);
-}
-
-/*ARGSUSED*/
-int
-findjsobjects_prop(const char *desc, uintptr_t val, void *arg)
-{
- findjsobjects_state_t *fjs = arg;
- findjsobjects_obj_t *current = fjs->fjs_current;
- findjsobjects_prop_t *prop;
-
- if (desc == NULL)
- desc = "<unknown>";
-
- prop = mdb_zalloc(sizeof (findjsobjects_prop_t) +
- strlen(desc), UM_SLEEP);
-
- strcpy(prop->fjsp_desc, desc);
-
- if (current->fjso_last != NULL) {
- current->fjso_last->fjsp_next = prop;
- } else {
- current->fjso_props = prop;
- }
-
- current->fjso_last = prop;
- current->fjso_nprops++;
- current->fjso_malformed =
- val == NULL && current->fjso_nprops == 1 && desc[0] == '<';
-
- return (0);
-}
-
-static void
-findjsobjects_constructor(findjsobjects_obj_t *obj)
-{
- char *bufp = obj->fjso_constructor;
- size_t len = sizeof (obj->fjso_constructor);
- uintptr_t map, funcinfop;
- uintptr_t addr = obj->fjso_instances.fjsi_addr;
- uint8_t type;
-
- v8_silent++;
-
- if (read_heap_ptr(&map, addr, V8_OFF_HEAPOBJECT_MAP) != 0 ||
- read_heap_ptr(&addr, map, V8_OFF_MAP_CONSTRUCTOR) != 0)
- goto out;
-
- if (read_typebyte(&type, addr) != 0)
- goto out;
-
- if (strcmp(enum_lookup_str(v8_types, type, ""), "JSFunction") != 0)
- goto out;
-
- if (read_heap_ptr(&funcinfop, addr, V8_OFF_JSFUNCTION_SHARED) != 0)
- goto out;
-
- if (jsfunc_name(funcinfop, &bufp, &len) != 0)
- goto out;
-out:
- v8_silent--;
-}
-
-int
-findjsobjects_range(findjsobjects_state_t *fjs, uintptr_t addr, uintptr_t size)
-{
- uintptr_t limit;
- findjsobjects_stats_t *stats = &fjs->fjs_stats;
- uint8_t type;
- int jsobject = V8_TYPE_JSOBJECT, jsarray = V8_TYPE_JSARRAY;
- caddr_t range = mdb_alloc(size, UM_SLEEP);
- uintptr_t base = addr, mapaddr;
-
- if (mdb_vread(range, size, addr) == -1)
- return (0);
-
- for (limit = addr + size; addr < limit; addr++) {
- findjsobjects_instance_t *inst;
- findjsobjects_obj_t *obj;
- avl_index_t where;
-
- if (V8_IS_SMI(addr))
- continue;
-
- if (!V8_IS_HEAPOBJECT(addr))
- continue;
-
- stats->fjss_heapobjs++;
-
- mapaddr = *((uintptr_t *)((uintptr_t)range +
- (addr - base) + V8_OFF_HEAPOBJECT_MAP));
-
- if (!V8_IS_HEAPOBJECT(mapaddr))
- continue;
-
- mapaddr += V8_OFF_MAP_INSTANCE_ATTRIBUTES;
- stats->fjss_typereads++;
-
- if (mapaddr >= base && mapaddr < base + size) {
- stats->fjss_cached++;
-
- type = *((uint8_t *)((uintptr_t)range +
- (mapaddr - base)));
- } else {
- if (mdb_vread(&type, sizeof (uint8_t), mapaddr) == -1)
- continue;
- }
-
- if (type != jsobject && type != jsarray)
- continue;
-
- stats->fjss_jsobjs++;
-
- fjs->fjs_current = findjsobjects_alloc(addr);
-
- if (type == jsobject) {
- if (jsobj_properties(addr,
- findjsobjects_prop, fjs) != 0) {
- findjsobjects_free(fjs->fjs_current);
- fjs->fjs_current = NULL;
- continue;
- }
-
- findjsobjects_constructor(fjs->fjs_current);
- stats->fjss_objects++;
- } else {
- uintptr_t ptr;
- size_t *nprops = &fjs->fjs_current->fjso_nprops;
- ssize_t len = V8_OFF_JSARRAY_LENGTH;
- ssize_t elems = V8_OFF_JSOBJECT_ELEMENTS;
- ssize_t flen = V8_OFF_FIXEDARRAY_LENGTH;
- uintptr_t nelems;
- uint8_t t;
-
- if (read_heap_smi(nprops, addr, len) != 0 ||
- read_heap_ptr(&ptr, addr, elems) != 0 ||
- !V8_IS_HEAPOBJECT(ptr) ||
- read_typebyte(&t, ptr) != 0 ||
- t != V8_TYPE_FIXEDARRAY ||
- read_heap_smi(&nelems, ptr, flen) != 0 ||
- nelems < *nprops) {
- findjsobjects_free(fjs->fjs_current);
- fjs->fjs_current = NULL;
- continue;
- }
-
- strcpy(fjs->fjs_current->fjso_constructor, "Array");
- stats->fjss_arrays++;
- }
-
- /*
- * Now determine if we already have an object matching our
- * properties. If we don't, we'll add our new object; if we
- * do we'll merely enqueue our instance.
- */
- obj = avl_find(&fjs->fjs_tree, fjs->fjs_current, &where);
-
- if (obj == NULL) {
- avl_add(&fjs->fjs_tree, fjs->fjs_current);
- fjs->fjs_current->fjso_next = fjs->fjs_objects;
- fjs->fjs_objects = fjs->fjs_current;
- fjs->fjs_current = NULL;
- stats->fjss_uniques++;
- continue;
- }
-
- findjsobjects_free(fjs->fjs_current);
- fjs->fjs_current = NULL;
-
- inst = mdb_alloc(sizeof (findjsobjects_instance_t), UM_SLEEP);
- inst->fjsi_addr = addr;
- inst->fjsi_next = obj->fjso_instances.fjsi_next;
- obj->fjso_instances.fjsi_next = inst;
- obj->fjso_ninstances++;
- }
-
- mdb_free(range, size);
-
- return (0);
-}
-
-static int
-findjsobjects_mapping(findjsobjects_state_t *fjs, const prmap_t *pmp,
- const char *name)
-{
- if (name != NULL && !(fjs->fjs_brk && (pmp->pr_mflags & MA_BREAK)))
- return (0);
-
- if (fjs->fjs_addr != NULL && (fjs->fjs_addr < pmp->pr_vaddr ||
- fjs->fjs_addr >= pmp->pr_vaddr + pmp->pr_size))
- return (0);
-
- return (findjsobjects_range(fjs, pmp->pr_vaddr, pmp->pr_size));
-}
-
-static void
-findjsobjects_references_add(findjsobjects_state_t *fjs, uintptr_t val,
- const char *desc, size_t index)
-{
- findjsobjects_referent_t search, *referent;
- findjsobjects_reference_t *reference;
-
- search.fjsr_addr = val;
-
- if ((referent = avl_find(&fjs->fjs_referents, &search, NULL)) == NULL)
- return;
-
- reference = mdb_zalloc(sizeof (*reference), UM_SLEEP | UM_GC);
- reference->fjsrf_addr = fjs->fjs_addr;
-
- if (desc != NULL) {
- reference->fjsrf_desc =
- mdb_alloc(strlen(desc) + 1, UM_SLEEP | UM_GC);
- (void) strcpy(reference->fjsrf_desc, desc);
- } else {
- reference->fjsrf_index = index;
- }
-
- if (referent->fjsr_head == NULL) {
- referent->fjsr_head = reference;
- } else {
- referent->fjsr_tail->fjsrf_next = reference;
- }
-
- referent->fjsr_tail = reference;
-}
-
-static int
-findjsobjects_references_prop(const char *desc, uintptr_t val, void *arg)
-{
- findjsobjects_references_add(arg, val, desc, -1);
-
- return (0);
-}
-
-static void
-findjsobjects_references_array(findjsobjects_state_t *fjs,
- findjsobjects_obj_t *obj)
-{
- findjsobjects_instance_t *inst = &obj->fjso_instances;
- uintptr_t *elts;
- size_t i, len;
-
- for (; inst != NULL; inst = inst->fjsi_next) {
- uintptr_t addr = inst->fjsi_addr, ptr;
-
- if (read_heap_ptr(&ptr, addr, V8_OFF_JSOBJECT_ELEMENTS) != 0 ||
- read_heap_array(ptr, &elts, &len, UM_SLEEP) != 0)
- continue;
-
- fjs->fjs_addr = addr;
-
- for (i = 0; i < len; i++)
- findjsobjects_references_add(fjs, elts[i], NULL, i);
-
- mdb_free(elts, len * sizeof (uintptr_t));
- }
-}
-
-static void
-findjsobjects_referent(findjsobjects_state_t *fjs, uintptr_t addr)
-{
- findjsobjects_referent_t search, *referent;
-
- search.fjsr_addr = addr;
-
- if (avl_find(&fjs->fjs_referents, &search, NULL) != NULL) {
- assert(fjs->fjs_marking);
- mdb_warn("%p is already marked; ignoring\n", addr);
- return;
- }
-
- referent = mdb_zalloc(sizeof (findjsobjects_referent_t), UM_SLEEP);
- referent->fjsr_addr = addr;
-
- avl_add(&fjs->fjs_referents, referent);
-
- if (fjs->fjs_tail != NULL) {
- fjs->fjs_tail->fjsr_next = referent;
- } else {
- fjs->fjs_head = referent;
- }
-
- fjs->fjs_tail = referent;
-
- if (fjs->fjs_marking)
- mdb_printf("findjsobjects: marked %p\n", addr);
-}
-
-static void
-findjsobjects_references(findjsobjects_state_t *fjs)
-{
- findjsobjects_reference_t *reference;
- findjsobjects_referent_t *referent;
- avl_tree_t *referents = &fjs->fjs_referents;
- findjsobjects_obj_t *obj;
- void *cookie = NULL;
- uintptr_t addr;
-
- fjs->fjs_referred = B_FALSE;
-
- v8_silent++;
-
- /*
- * First traverse over all objects and arrays, looking for references
- * to our designated referent(s).
- */
- for (obj = fjs->fjs_objects; obj != NULL; obj = obj->fjso_next) {
- findjsobjects_instance_t *head = &obj->fjso_instances, *inst;
-
- if (obj->fjso_nprops != 0 && obj->fjso_props == NULL) {
- findjsobjects_references_array(fjs, obj);
- continue;
- }
-
- for (inst = head; inst != NULL; inst = inst->fjsi_next) {
- fjs->fjs_addr = inst->fjsi_addr;
-
- (void) jsobj_properties(inst->fjsi_addr,
- findjsobjects_references_prop, fjs);
- }
- }
-
- v8_silent--;
- fjs->fjs_addr = NULL;
-
- /*
- * Now go over our referent(s), reporting any references that we have
- * accumulated.
- */
- for (referent = fjs->fjs_head; referent != NULL;
- referent = referent->fjsr_next) {
- addr = referent->fjsr_addr;
-
- if ((reference = referent->fjsr_head) == NULL) {
- mdb_printf("%p is not referred to by a "
- "known object.\n", addr);
- continue;
- }
-
- for (; reference != NULL; reference = reference->fjsrf_next) {
- mdb_printf("%p referred to by %p",
- addr, reference->fjsrf_addr);
-
- if (reference->fjsrf_desc == NULL) {
- mdb_printf("[%d]\n", reference->fjsrf_index);
- } else {
- mdb_printf(".%s\n", reference->fjsrf_desc);
- }
- }
- }
-
- /*
- * Finally, destroy our referent nodes.
- */
- while ((referent = avl_destroy_nodes(referents, &cookie)) != NULL)
- mdb_free(referent, sizeof (findjsobjects_referent_t));
-
- fjs->fjs_head = NULL;
- fjs->fjs_tail = NULL;
-}
-
-static findjsobjects_instance_t *
-findjsobjects_instance(findjsobjects_state_t *fjs, uintptr_t addr,
- findjsobjects_instance_t **headp)
-{
- findjsobjects_obj_t *obj;
-
- for (obj = fjs->fjs_objects; obj != NULL; obj = obj->fjso_next) {
- findjsobjects_instance_t *head = &obj->fjso_instances, *inst;
-
- for (inst = head; inst != NULL; inst = inst->fjsi_next) {
- if (inst->fjsi_addr == addr) {
- *headp = head;
- return (inst);
- }
- }
- }
-
- return (NULL);
-}
-
-/*ARGSUSED*/
-static void
-findjsobjects_match_all(findjsobjects_obj_t *obj, const char *ignored)
-{
- mdb_printf("%p\n", obj->fjso_instances.fjsi_addr);
-}
-
-static void
-findjsobjects_match_propname(findjsobjects_obj_t *obj, const char *propname)
-{
- findjsobjects_prop_t *prop;
-
- for (prop = obj->fjso_props; prop != NULL; prop = prop->fjsp_next) {
- if (strcmp(prop->fjsp_desc, propname) == 0) {
- mdb_printf("%p\n", obj->fjso_instances.fjsi_addr);
- return;
- }
- }
-}
-
-static void
-findjsobjects_match_constructor(findjsobjects_obj_t *obj,
- const char *constructor)
-{
- if (strcmp(constructor, obj->fjso_constructor) == 0)
- mdb_printf("%p\n", obj->fjso_instances.fjsi_addr);
-}
-
-static int
-findjsobjects_match(findjsobjects_state_t *fjs, uintptr_t addr,
- uint_t flags, void (*func)(findjsobjects_obj_t *, const char *),
- const char *match)
-{
- findjsobjects_obj_t *obj;
-
- if (!(flags & DCMD_ADDRSPEC)) {
- for (obj = fjs->fjs_objects; obj != NULL;
- obj = obj->fjso_next) {
- if (obj->fjso_malformed && !fjs->fjs_allobjs)
- continue;
-
- func(obj, match);
- }
-
- return (DCMD_OK);
- }
-
- /*
- * First, look for the specified address among the representative
- * objects.
- */
- for (obj = fjs->fjs_objects; obj != NULL; obj = obj->fjso_next) {
- if (obj->fjso_instances.fjsi_addr == addr) {
- func(obj, match);
- return (DCMD_OK);
- }
- }
-
- /*
- * We didn't find it among the representative objects; iterate over
- * all objects.
- */
- for (obj = fjs->fjs_objects; obj != NULL; obj = obj->fjso_next) {
- findjsobjects_instance_t *head = &obj->fjso_instances, *inst;
-
- for (inst = head; inst != NULL; inst = inst->fjsi_next) {
- if (inst->fjsi_addr == addr) {
- func(obj, match);
- return (DCMD_OK);
- }
- }
- }
-
- mdb_warn("%p does not correspond to a known object\n", addr);
- return (DCMD_ERR);
-}
-
-static void
-findjsobjects_print(findjsobjects_obj_t *obj)
-{
- int col = 19 + (sizeof (uintptr_t) * 2) + strlen("..."), len;
- uintptr_t addr = obj->fjso_instances.fjsi_addr;
- findjsobjects_prop_t *prop;
-
- mdb_printf("%?p %8d %8d ",
- addr, obj->fjso_ninstances, obj->fjso_nprops);
-
- if (obj->fjso_constructor[0] != '\0') {
- mdb_printf("%s%s", obj->fjso_constructor,
- obj->fjso_props != NULL ? ": " : "");
- col += strlen(obj->fjso_constructor) + 2;
- }
-
- for (prop = obj->fjso_props; prop != NULL; prop = prop->fjsp_next) {
- if (col + (len = strlen(prop->fjsp_desc) + 2) < 80) {
- mdb_printf("%s%s", prop->fjsp_desc,
- prop->fjsp_next != NULL ? ", " : "");
- col += len;
- } else {
- mdb_printf("...");
- break;
- }
- }
-
- mdb_printf("\n", col);
-}
-
-static void
-dcmd_findjsobjects_help(void)
-{
- mdb_printf("%s\n\n",
-"Finds all JavaScript objects in the V8 heap via brute force iteration over\n"
-"all mapped anonymous memory. (This can take up to several minutes on large\n"
-"dumps.) The output consists of representative objects, the number of\n"
-"instances of that object and the number of properties on the object --\n"
-"followed by the constructor and first few properties of the objects. Once\n"
-"run, subsequent calls to ::findjsobjects use cached data. If provided an\n"
-"address (and in the absence of -r, described below), ::findjsobjects treats\n"
-"the address as that of a representative object, and lists all instances of\n"
-"that object (that is, all objects that have a matching property signature).");
-
- mdb_dec_indent(2);
- mdb_printf("%<b>OPTIONS%</b>\n");
- mdb_inc_indent(2);
-
- mdb_printf("%s\n",
-" -b Include the heap denoted by the brk(2) (normally excluded)\n"
-" -c cons Display representative objects with the specified constructor\n"
-" -p prop Display representative objects that have the specified property\n"
-" -l List all objects that match the representative object\n"
-" -m Mark specified object for later reference determination via -r\n"
-" -r Find references to the specified and/or marked object(s)\n"
-" -v Provide verbose statistics\n");
-}
-
-static int
-dcmd_findjsobjects(uintptr_t addr,
- uint_t flags, int argc, const mdb_arg_t *argv)
-{
- static findjsobjects_state_t fjs;
- static findjsobjects_stats_t *stats = &fjs.fjs_stats;
- findjsobjects_obj_t *obj;
- struct ps_prochandle *Pr;
- boolean_t references = B_FALSE, listlike = B_FALSE;
- const char *propname = NULL;
- const char *constructor = NULL;
-
- fjs.fjs_verbose = B_FALSE;
- fjs.fjs_brk = B_FALSE;
- fjs.fjs_marking = B_FALSE;
- fjs.fjs_allobjs = B_FALSE;
-
- if (mdb_getopts(argc, argv,
- 'a', MDB_OPT_SETBITS, B_TRUE, &fjs.fjs_allobjs,
- 'b', MDB_OPT_SETBITS, B_TRUE, &fjs.fjs_brk,
- 'c', MDB_OPT_STR, &constructor,
- 'l', MDB_OPT_SETBITS, B_TRUE, &listlike,
- 'm', MDB_OPT_SETBITS, B_TRUE, &fjs.fjs_marking,
- 'p', MDB_OPT_STR, &propname,
- 'r', MDB_OPT_SETBITS, B_TRUE, &references,
- 'v', MDB_OPT_SETBITS, B_TRUE, &fjs.fjs_verbose,
- NULL) != argc)
- return (DCMD_USAGE);
-
- if (!fjs.fjs_initialized) {
- avl_create(&fjs.fjs_tree,
- (int(*)(const void *, const void *))findjsobjects_cmp,
- sizeof (findjsobjects_obj_t),
- offsetof(findjsobjects_obj_t, fjso_node));
-
- avl_create(&fjs.fjs_referents,
- (int(*)(const void *, const void *))
- findjsobjects_cmp_referents,
- sizeof (findjsobjects_referent_t),
- offsetof(findjsobjects_referent_t, fjsr_node));
-
- fjs.fjs_initialized = B_TRUE;
- }
-
- if (avl_is_empty(&fjs.fjs_tree)) {
- findjsobjects_obj_t **sorted;
- int nobjs, i;
- hrtime_t start = gethrtime();
-
- if (mdb_get_xdata("pshandle", &Pr, sizeof (Pr)) == -1) {
- mdb_warn("couldn't read pshandle xdata");
- return (DCMD_ERR);
- }
-
- v8_silent++;
-
- if (Pmapping_iter(Pr,
- (proc_map_f *)findjsobjects_mapping, &fjs) != 0) {
- v8_silent--;
- return (DCMD_ERR);
- }
-
- if ((nobjs = avl_numnodes(&fjs.fjs_tree)) != 0) {
- /*
- * We have the objects -- now sort them.
- */
- sorted = mdb_alloc(nobjs * sizeof (void *),
- UM_SLEEP | UM_GC);
-
- for (obj = fjs.fjs_objects, i = 0; obj != NULL;
- obj = obj->fjso_next, i++) {
- sorted[i] = obj;
- }
-
- qsort(sorted, avl_numnodes(&fjs.fjs_tree),
- sizeof (void *), findjsobjects_cmp_ninstances);
-
- for (i = 1, fjs.fjs_objects = sorted[0]; i < nobjs; i++)
- sorted[i - 1]->fjso_next = sorted[i];
-
- sorted[nobjs - 1]->fjso_next = NULL;
- }
-
- v8_silent--;
-
- if (fjs.fjs_verbose) {
- const char *f = "findjsobjects: %30s => %d\n";
- int elapsed = (int)((gethrtime() - start) / NANOSEC);
-
- mdb_printf(f, "elapsed time (seconds)", elapsed);
- mdb_printf(f, "heap objects", stats->fjss_heapobjs);
- mdb_printf(f, "type reads", stats->fjss_typereads);
- mdb_printf(f, "cached reads", stats->fjss_cached);
- mdb_printf(f, "JavaScript objects", stats->fjss_jsobjs);
- mdb_printf(f, "processed objects", stats->fjss_objects);
- mdb_printf(f, "processed arrays", stats->fjss_arrays);
- mdb_printf(f, "unique objects", stats->fjss_uniques);
- }
- }
-
- if (listlike && !(flags & DCMD_ADDRSPEC)) {
- if (propname != NULL || constructor != NULL) {
- char opt = propname != NULL ? 'p' : 'c';
-
- mdb_warn("cannot specify -l with -%c; instead, pipe "
- "output of ::findjsobjects -%c to "
- "::findjsobjects -l\n", opt, opt);
- return (DCMD_ERR);
- }
-
- return (findjsobjects_match(&fjs, addr, flags,
- findjsobjects_match_all, NULL));
- }
-
- if (propname != NULL) {
- if (constructor != NULL) {
- mdb_warn("cannot specify both a property name "
- "and a constructor\n");
- return (DCMD_ERR);
- }
-
- return (findjsobjects_match(&fjs, addr, flags,
- findjsobjects_match_propname, propname));
- }
-
- if (constructor != NULL) {
- return (findjsobjects_match(&fjs, addr, flags,
- findjsobjects_match_constructor, constructor));
- }
-
- if (references && !(flags & DCMD_ADDRSPEC) &&
- avl_is_empty(&fjs.fjs_referents)) {
- mdb_warn("must specify or mark an object to find references\n");
- return (DCMD_ERR);
- }
-
- if (fjs.fjs_marking && !(flags & DCMD_ADDRSPEC)) {
- mdb_warn("must specify an object to mark\n");
- return (DCMD_ERR);
- }
-
- if (references && fjs.fjs_marking) {
- mdb_warn("can't both mark an object and find its references\n");
- return (DCMD_ERR);
- }
-
- if (flags & DCMD_ADDRSPEC) {
- findjsobjects_instance_t *inst, *head;
-
- /*
- * If we've been passed an address, it's to either list like
- * objects (-l), mark an object (-m) or find references to the
- * specified/marked objects (-r). (Note that the absence of
- * any of these options implies -l.)
- */
- inst = findjsobjects_instance(&fjs, addr, &head);
-
- if (inst == NULL) {
- mdb_warn("%p is not a valid object\n", addr);
- return (DCMD_ERR);
- }
-
- if (!references && !fjs.fjs_marking) {
- for (inst = head; inst != NULL; inst = inst->fjsi_next)
- mdb_printf("%p\n", inst->fjsi_addr);
-
- return (DCMD_OK);
- }
-
- if (!listlike) {
- findjsobjects_referent(&fjs, inst->fjsi_addr);
- } else {
- for (inst = head; inst != NULL; inst = inst->fjsi_next)
- findjsobjects_referent(&fjs, inst->fjsi_addr);
- }
- }
-
- if (references)
- findjsobjects_references(&fjs);
-
- if (references || fjs.fjs_marking)
- return (DCMD_OK);
-
- mdb_printf("%?s %8s %8s %s\n", "OBJECT",
- "#OBJECTS", "#PROPS", "CONSTRUCTOR: PROPS");
-
- for (obj = fjs.fjs_objects; obj != NULL; obj = obj->fjso_next) {
- if (obj->fjso_malformed && !fjs.fjs_allobjs)
- continue;
-
- findjsobjects_print(obj);
- }
-
- return (DCMD_OK);
-}
-
-/* ARGSUSED */
-static int
-dcmd_jsframe(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
-{
- uintptr_t fptr, raddr;
- boolean_t opt_v = B_FALSE, opt_i = B_FALSE;
- char *opt_f = NULL, *opt_p = NULL;
- uintptr_t opt_n = 5;
-
- if (mdb_getopts(argc, argv,
- 'v', MDB_OPT_SETBITS, B_TRUE, &opt_v,
- 'i', MDB_OPT_SETBITS, B_TRUE, &opt_i,
- 'f', MDB_OPT_STR, &opt_f,
- 'n', MDB_OPT_UINTPTR, &opt_n,
- 'p', MDB_OPT_STR, &opt_p, NULL) != argc)
- return (DCMD_USAGE);
-
- /*
- * As with $C, we assume we are given a *pointer* to the frame pointer
- * for a frame, rather than the actual frame pointer for the frame of
- * interest. This is needed to show the instruction pointer, which is
- * actually stored with the next frame. For debugging, this can be
- * overridden with the "-i" option (for "immediate").
- */
- if (opt_i)
- return (do_jsframe(addr, 0, opt_v, opt_f, opt_p, opt_n));
-
- if (mdb_vread(&raddr, sizeof (raddr),
- addr + sizeof (uintptr_t)) == -1) {
- mdb_warn("failed to read return address from %p",
- addr + sizeof (uintptr_t));
- return (DCMD_ERR);
- }
-
- if (mdb_vread(&fptr, sizeof (fptr), addr) == -1) {
- mdb_warn("failed to read frame pointer from %p", addr);
- return (DCMD_ERR);
- }
-
- if (fptr == NULL)
- return (DCMD_OK);
-
- return (do_jsframe(fptr, raddr, opt_v, opt_f, opt_p, opt_n));
-}
-
-/* ARGSUSED */
-static int
-dcmd_jsprint(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
-{
- char *buf, *bufp;
- size_t bufsz = 262144, len = bufsz;
- jsobj_print_t jsop;
- boolean_t opt_b = B_FALSE;
- int rv, i;
-
- bzero(&jsop, sizeof (jsop));
- jsop.jsop_depth = 2;
- jsop.jsop_printaddr = B_FALSE;
-
- i = mdb_getopts(argc, argv,
- 'a', MDB_OPT_SETBITS, B_TRUE, &jsop.jsop_printaddr,
- 'b', MDB_OPT_SETBITS, B_TRUE, &opt_b,
- 'd', MDB_OPT_UINT64, &jsop.jsop_depth, NULL);
-
- if (opt_b)
- jsop.jsop_baseaddr = addr;
-
- do {
- if (i != argc) {
- const mdb_arg_t *member = &argv[i++];
-
- if (member->a_type != MDB_TYPE_STRING)
- return (DCMD_USAGE);
-
- jsop.jsop_member = member->a_un.a_str;
- }
-
- for (;;) {
- if ((buf = bufp =
- mdb_zalloc(bufsz, UM_NOSLEEP)) == NULL)
- return (DCMD_ERR);
-
- jsop.jsop_bufp = &bufp;
- jsop.jsop_lenp = &len;
-
- rv = jsobj_print(addr, &jsop);
-
- if (len > 0)
- break;
-
- mdb_free(buf, bufsz);
- bufsz <<= 1;
- len = bufsz;
- }
-
- if (jsop.jsop_member == NULL && rv != 0) {
- if (!jsop.jsop_descended)
- mdb_warn("%s\n", buf);
-
- return (DCMD_ERR);
- }
-
- if (jsop.jsop_member && !jsop.jsop_found) {
- if (jsop.jsop_baseaddr)
- (void) mdb_printf("%p: ", jsop.jsop_baseaddr);
-
- (void) mdb_printf("undefined%s",
- i < argc ? " " : "");
- } else {
- (void) mdb_printf("%s%s", buf, i < argc &&
- !isspace(buf[strlen(buf) - 1]) ? " " : "");
- }
-
- mdb_free(buf, bufsz);
- jsop.jsop_found = B_FALSE;
- jsop.jsop_baseaddr = NULL;
- } while (i < argc);
-
- mdb_printf("\n");
-
- return (DCMD_OK);
-}
-
-/* ARGSUSED */
-static int
-dcmd_v8field(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
-{
- v8_class_t *clp;
- v8_field_t *flp;
- const char *klass, *field;
- uintptr_t offset = 0;
-
- /*
- * We may be invoked with either two arguments (class and field name) or
- * three (an offset to save).
- */
- if (argc != 2 && argc != 3)
- return (DCMD_USAGE);
-
- if (argv[0].a_type != MDB_TYPE_STRING ||
- argv[1].a_type != MDB_TYPE_STRING)
- return (DCMD_USAGE);
-
- klass = argv[0].a_un.a_str;
- field = argv[1].a_un.a_str;
-
- if (argc == 3) {
- if (argv[2].a_type != MDB_TYPE_STRING)
- return (DCMD_USAGE);
-
- offset = mdb_strtoull(argv[2].a_un.a_str);
- }
-
- for (clp = v8_classes; clp != NULL; clp = clp->v8c_next)
- if (strcmp(clp->v8c_name, klass) == 0)
- break;
-
- if (clp == NULL) {
- (void) mdb_printf("error: no such class: \"%s\"", klass);
- return (DCMD_ERR);
- }
-
- for (flp = clp->v8c_fields; flp != NULL; flp = flp->v8f_next)
- if (strcmp(field, flp->v8f_name) == 0)
- break;
-
- if (flp == NULL) {
- if (argc == 2) {
- mdb_printf("error: no such field in class \"%s\": "
- "\"%s\"", klass, field);
- return (DCMD_ERR);
- }
-
- flp = conf_field_create(clp, field, offset);
- if (flp == NULL) {
- mdb_warn("failed to create field");
- return (DCMD_ERR);
- }
- } else if (argc == 3) {
- flp->v8f_offset = offset;
- }
-
- mdb_printf("%s::%s at offset 0x%x\n", klass, field, flp->v8f_offset);
- return (DCMD_OK);
-}
-
-/* ARGSUSED */
-static int
-dcmd_v8array(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
-{
- uint8_t type;
- uintptr_t *array;
- size_t ii, len;
-
- if (read_typebyte(&type, addr) != 0)
- return (DCMD_ERR);
-
- if (type != V8_TYPE_FIXEDARRAY) {
- mdb_warn("%p is not an instance of FixedArray\n", addr);
- return (DCMD_ERR);
- }
-
- if (read_heap_array(addr, &array, &len, UM_SLEEP | UM_GC) != 0)
- return (DCMD_ERR);
-
- for (ii = 0; ii < len; ii++)
- mdb_printf("%p\n", array[ii]);
-
- return (DCMD_OK);
-}
-
-/* ARGSUSED */
-static int
-dcmd_jsstack(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
-{
- uintptr_t raddr, opt_n = 5;
- boolean_t opt_v = B_FALSE;
- char *opt_f = NULL, *opt_p = NULL;
-
- if (mdb_getopts(argc, argv,
- 'v', MDB_OPT_SETBITS, B_TRUE, &opt_v,
- 'f', MDB_OPT_STR, &opt_f,
- 'n', MDB_OPT_UINTPTR, &opt_n,
- 'p', MDB_OPT_STR, &opt_p,
- NULL) != argc)
- return (DCMD_USAGE);
-
- /*
- * The "::jsframe" walker iterates the valid frame pointers, but the
- * "::jsframe" dcmd looks at the frame after the one it was given, so we
- * have to explicitly examine the top frame here.
- */
- if (!(flags & DCMD_ADDRSPEC)) {
- if (load_current_context(&addr, &raddr) != 0 ||
- do_jsframe(addr, raddr, opt_v, opt_f, opt_p, opt_n) != 0)
- return (DCMD_ERR);
- }
-
- if (mdb_pwalk_dcmd("jsframe", "jsframe", argc, argv, addr) == -1)
- return (DCMD_ERR);
-
- return (DCMD_OK);
-}
-
-/* ARGSUSED */
-static int
-dcmd_v8str(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
-{
- boolean_t opt_v = B_FALSE;
- char buf[512 * 1024];
- char *bufp;
- size_t len;
-
- if (mdb_getopts(argc, argv, 'v', MDB_OPT_SETBITS, B_TRUE, &opt_v,
- NULL) != argc)
- return (DCMD_USAGE);
-
- bufp = buf;
- len = sizeof (buf);
- if (jsstr_print(addr, (opt_v ? JSSTR_VERBOSE : JSSTR_NONE) |
- JSSTR_QUOTED, &bufp, &len) != 0)
- return (DCMD_ERR);
-
- mdb_printf("%s\n", buf);
- return (DCMD_OK);
-}
-
-static void
-dcmd_v8load_help(void)
-{
- v8_cfg_t *cfp, **cfgpp;
-
- mdb_printf(
- "To traverse in-memory V8 structures, the V8 dmod requires\n"
- "configuration that describes the layout of various V8 structures\n"
- "in memory. Normally, this information is pulled from metadata\n"
- "in the target binary. However, it's possible to use the module\n"
- "with a binary not built with metadata by loading one of the\n"
- "canned configurations.\n\n");
-
- mdb_printf("Available configurations:\n");
-
- (void) mdb_inc_indent(4);
-
- for (cfgpp = v8_cfgs; *cfgpp != NULL; cfgpp++) {
- cfp = *cfgpp;
- mdb_printf("%-10s %s\n", cfp->v8cfg_name, cfp->v8cfg_label);
- }
-
- (void) mdb_dec_indent(4);
-}
-
-/* ARGSUSED */
-static int
-dcmd_v8load(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
-{
- v8_cfg_t *cfgp = NULL, **cfgpp;
-
- if (v8_classes != NULL) {
- mdb_warn("v8 module already configured\n");
- return (DCMD_ERR);
- }
-
- if (argc < 1 || argv->a_type != MDB_TYPE_STRING)
- return (DCMD_USAGE);
-
- for (cfgpp = v8_cfgs; *cfgpp != NULL; cfgpp++) {
- cfgp = *cfgpp;
- if (strcmp(argv->a_un.a_str, cfgp->v8cfg_name) == 0)
- break;
- }
-
- if (cfgp == NULL || cfgp->v8cfg_name == NULL) {
- mdb_warn("unknown configuration: \"%s\"\n", argv->a_un.a_str);
- return (DCMD_ERR);
- }
-
- if (autoconfigure(cfgp) == -1) {
- mdb_warn("autoconfigure failed\n");
- return (DCMD_ERR);
- }
-
- mdb_printf("V8 dmod configured based on %s\n", cfgp->v8cfg_name);
- return (DCMD_OK);
-}
-
-/* ARGSUSED */
-static int
-dcmd_v8warnings(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
-{
- v8_warnings ^= 1;
- mdb_printf("v8 warnings are now %s\n", v8_warnings ? "on" : "off");
-
- return (DCMD_OK);
-}
-
-static int
-walk_jsframes_init(mdb_walk_state_t *wsp)
-{
- if (wsp->walk_addr != NULL)
- return (WALK_NEXT);
-
- if (load_current_context(&wsp->walk_addr, NULL) != 0)
- return (WALK_ERR);
-
- return (WALK_NEXT);
-}
-
-static int
-walk_jsframes_step(mdb_walk_state_t *wsp)
-{
- uintptr_t addr, next;
- int rv;
-
- addr = wsp->walk_addr;
- rv = wsp->walk_callback(wsp->walk_addr, NULL, wsp->walk_cbdata);
-
- if (rv != WALK_NEXT)
- return (rv);
-
- if (mdb_vread(&next, sizeof (next), addr) == -1)
- return (WALK_ERR);
-
- if (next == NULL)
- return (WALK_DONE);
-
- wsp->walk_addr = next;
- return (WALK_NEXT);
-}
-
-typedef struct jsprop_walk_data {
- int jspw_nprops;
- int jspw_current;
- uintptr_t *jspw_props;
-} jsprop_walk_data_t;
-
-/*ARGSUSED*/
-static int
-walk_jsprop_nprops(const char *desc, uintptr_t val, void *arg)
-{
- jsprop_walk_data_t *jspw = arg;
- jspw->jspw_nprops++;
-
- return (0);
-}
-
-/*ARGSUSED*/
-static int
-walk_jsprop_props(const char *desc, uintptr_t val, void *arg)
-{
- jsprop_walk_data_t *jspw = arg;
- jspw->jspw_props[jspw->jspw_current++] = val;
-
- return (0);
-}
-
-static int
-walk_jsprop_init(mdb_walk_state_t *wsp)
-{
- jsprop_walk_data_t *jspw;
- uintptr_t addr;
- uint8_t type;
-
- if ((addr = wsp->walk_addr) == NULL) {
- mdb_warn("'jsprop' does not support global walks\n");
- return (WALK_ERR);
- }
-
- if (!V8_IS_HEAPOBJECT(addr) || read_typebyte(&type, addr) != 0 ||
- type != V8_TYPE_JSOBJECT) {
- mdb_warn("%p is not a JSObject\n", addr);
- return (WALK_ERR);
- }
-
- jspw = mdb_zalloc(sizeof (jsprop_walk_data_t), UM_SLEEP | UM_GC);
-
- if (jsobj_properties(addr, walk_jsprop_nprops, jspw) == -1) {
- mdb_warn("couldn't iterate over properties for %p\n", addr);
- return (WALK_ERR);
- }
-
- jspw->jspw_props = mdb_zalloc(jspw->jspw_nprops *
- sizeof (uintptr_t), UM_SLEEP | UM_GC);
-
- if (jsobj_properties(addr, walk_jsprop_props, jspw) == -1) {
- mdb_warn("couldn't iterate over properties for %p\n", addr);
- return (WALK_ERR);
- }
-
- jspw->jspw_current = 0;
- wsp->walk_data = jspw;
-
- return (WALK_NEXT);
-}
-
-static int
-walk_jsprop_step(mdb_walk_state_t *wsp)
-{
- jsprop_walk_data_t *jspw = wsp->walk_data;
- int rv;
-
- if (jspw->jspw_current >= jspw->jspw_nprops)
- return (WALK_DONE);
-
- if ((rv = wsp->walk_callback(jspw->jspw_props[jspw->jspw_current++],
- NULL, wsp->walk_cbdata)) != WALK_NEXT)
- return (rv);
-
- return (WALK_NEXT);
-}
-
-/*
- * MDB linkage
- */
-
-static const mdb_dcmd_t v8_mdb_dcmds[] = {
- /*
- * Commands to inspect JavaScript-level state
- */
- { "jsframe", ":[-iv] [-f function] [-p property] [-n numlines]",
- "summarize a JavaScript stack frame", dcmd_jsframe },
- { "jsprint", ":[-ab] [-d depth] [member]", "print a JavaScript object",
- dcmd_jsprint },
- { "jsstack", "[-v] [-f function] [-p property] [-n numlines]",
- "print a JavaScript stacktrace", dcmd_jsstack },
- { "findjsobjects", "?[-vb] [-r | -c cons | -p prop]", "find JavaScript "
- "objects", dcmd_findjsobjects, dcmd_findjsobjects_help },
-
- /*
- * Commands to inspect V8-level state
- */
- { "v8array", ":", "print elements of a V8 FixedArray",
- dcmd_v8array },
- { "v8classes", NULL, "list known V8 heap object C++ classes",
- dcmd_v8classes },
- { "v8code", ":[-d]", "print information about a V8 Code object",
- dcmd_v8code },
- { "v8field", "classname fieldname offset",
- "manually add a field to a given class", dcmd_v8field },
- { "v8function", ":[-d]", "print JSFunction object details",
- dcmd_v8function },
- { "v8load", "version", "load canned config for a specific V8 version",
- dcmd_v8load, dcmd_v8load_help },
- { "v8frametypes", NULL, "list known V8 frame types",
- dcmd_v8frametypes },
- { "v8print", ":[class]", "print a V8 heap object",
- dcmd_v8print, dcmd_v8print_help },
- { "v8str", ":[-v]", "print the contents of a V8 string",
- dcmd_v8str },
- { "v8type", ":", "print the type of a V8 heap object",
- dcmd_v8type },
- { "v8types", NULL, "list known V8 heap object types",
- dcmd_v8types },
- { "v8warnings", NULL, "toggle V8 warnings",
- dcmd_v8warnings },
-
- { NULL }
-};
-
-static const mdb_walker_t v8_mdb_walkers[] = {
- { "jsframe", "walk V8 JavaScript stack frames",
- walk_jsframes_init, walk_jsframes_step },
- { "jsprop", "walk property values for an object",
- walk_jsprop_init, walk_jsprop_step },
- { NULL }
-};
-
-static mdb_modinfo_t v8_mdb = { MDB_API_VERSION, v8_mdb_dcmds, v8_mdb_walkers };
-
-static void
-configure(void)
-{
- char *success;
- v8_cfg_t *cfgp = NULL;
- GElf_Sym sym;
-
- if (mdb_readsym(&v8_major, sizeof (v8_major),
- "_ZN2v88internal7Version6major_E") == -1 ||
- mdb_readsym(&v8_minor, sizeof (v8_minor),
- "_ZN2v88internal7Version6minor_E") == -1 ||
- mdb_readsym(&v8_build, sizeof (v8_build),
- "_ZN2v88internal7Version6build_E") == -1 ||
- mdb_readsym(&v8_patch, sizeof (v8_patch),
- "_ZN2v88internal7Version6patch_E") == -1) {
- mdb_warn("failed to determine V8 version");
- return;
- }
-
- mdb_printf("V8 version: %d.%d.%d.%d\n",
- v8_major, v8_minor, v8_build, v8_patch);
-
- /*
- * First look for debug metadata embedded within the binary, which may
- * be present in recent V8 versions built with postmortem metadata.
- */
- if (mdb_lookup_by_name("v8dbg_SmiTag", &sym) == 0) {
- cfgp = &v8_cfg_target;
- success = "Autoconfigured V8 support from target";
- } else if (v8_major == 3 && v8_minor == 1 && v8_build == 8) {
- cfgp = &v8_cfg_04;
- success = "Configured V8 support based on node v0.4";
- } else if (v8_major == 3 && v8_minor == 6 && v8_build == 6) {
- cfgp = &v8_cfg_06;
- success = "Configured V8 support based on node v0.6";
- } else {
- mdb_printf("mdb_v8: target has no debug metadata and "
- "no existing config found\n");
- return;
- }
-
- if (autoconfigure(cfgp) != 0) {
- mdb_warn("failed to autoconfigure from target; "
- "commands may have incorrect results!\n");
- return;
- }
-
- mdb_printf("%s\n", success);
-}
-
-static void
-enable_demangling(void)
-{
- const char *symname = "_ZN2v88internal7Version6major_E";
- GElf_Sym sym;
- char buf[64];
-
- /*
- * Try to determine whether C++ symbol demangling has been enabled. If
- * not, enable it.
- */
- if (mdb_lookup_by_name("_ZN2v88internal7Version6major_E", &sym) != 0)
- return;
-
- (void) mdb_snprintf(buf, sizeof (buf), "%a", sym.st_value);
- if (strstr(buf, symname) != NULL)
- (void) mdb_eval("$G");
-}
-
-const mdb_modinfo_t *
-_mdb_init(void)
-{
- configure();
- enable_demangling();
- return (&v8_mdb);
-}
+++ /dev/null
-/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- */
-
-/*
- * mdb_v8_cfg.c: canned configurations for previous V8 versions.
- *
- * The functions and data defined here enable this dmod to support debugging
- * Node.js binaries that predated V8's built-in postmortem debugging support.
- */
-
-#include "v8cfg.h"
-
-/*ARGSUSED*/
-static int
-v8cfg_target_iter(v8_cfg_t *cfgp, int (*func)(mdb_symbol_t *, void *),
- void *arg)
-{
- return (mdb_symbol_iter(MDB_OBJ_EVERY, MDB_DYNSYM,
- MDB_BIND_GLOBAL | MDB_TYPE_OBJECT | MDB_TYPE_FUNC,
- func, arg));
-}
-
-/*ARGSUSED*/
-static int
-v8cfg_target_readsym(v8_cfg_t *cfgp, const char *name, intptr_t *valp)
-{
- int val, rval;
-
- if ((rval = mdb_readsym(&val, sizeof (val), name)) != -1)
- *valp = (intptr_t)val;
-
- return (rval);
-}
-
-/*
- * Analog of mdb_symbol_iter() for a canned configuration.
- */
-static int
-v8cfg_canned_iter(v8_cfg_t *cfgp, int (*func)(mdb_symbol_t *, void *),
- void *arg)
-{
- v8_cfg_symbol_t *v8sym;
- mdb_symbol_t mdbsym;
- int rv;
-
- for (v8sym = cfgp->v8cfg_symbols; v8sym->v8cs_name != NULL; v8sym++) {
- mdbsym.sym_name = v8sym->v8cs_name;
- mdbsym.sym_object = NULL;
- mdbsym.sym_sym = NULL;
- mdbsym.sym_table = 0;
- mdbsym.sym_id = 0;
-
- if ((rv = func(&mdbsym, arg)) != 0)
- return (rv);
- }
-
- return (0);
-}
-
-/*
- * Analog of mdb_readsym() for a canned configuration.
- */
-static int
-v8cfg_canned_readsym(v8_cfg_t *cfgp, const char *name, intptr_t *valp)
-{
- v8_cfg_symbol_t *v8sym;
-
- for (v8sym = cfgp->v8cfg_symbols; v8sym->v8cs_name != NULL; v8sym++) {
- if (strcmp(name, v8sym->v8cs_name) == 0)
- break;
- }
-
- if (v8sym->v8cs_name == NULL)
- return (-1);
-
- *valp = v8sym->v8cs_value;
- return (0);
-}
-
-/*
- * Canned configuration for the V8 bundled with Node.js v0.4.8 and later.
- */
-static v8_cfg_symbol_t v8_symbols_node_04[] = {
- { "v8dbg_type_AccessCheckInfo__ACCESS_CHECK_INFO_TYPE", 0x91 },
- { "v8dbg_type_AccessorInfo__ACCESSOR_INFO_TYPE", 0x90 },
- { "v8dbg_type_BreakPointInfo__BREAK_POINT_INFO_TYPE", 0x9b },
- { "v8dbg_type_ByteArray__BYTE_ARRAY_TYPE", 0x86 },
- { "v8dbg_type_CallHandlerInfo__CALL_HANDLER_INFO_TYPE", 0x93 },
- { "v8dbg_type_Code__CODE_TYPE", 0x81 },
- { "v8dbg_type_CodeCache__CODE_CACHE_TYPE", 0x99 },
- { "v8dbg_type_ConsString__CONS_ASCII_STRING_TYPE", 0x5 },
- { "v8dbg_type_ConsString__CONS_ASCII_SYMBOL_TYPE", 0x45 },
- { "v8dbg_type_ConsString__CONS_STRING_TYPE", 0x1 },
- { "v8dbg_type_ConsString__CONS_SYMBOL_TYPE", 0x41 },
- { "v8dbg_type_DebugInfo__DEBUG_INFO_TYPE", 0x9a },
- { "v8dbg_type_ExternalAsciiString__EXTERNAL_ASCII_STRING_TYPE", 0x6 },
- { "v8dbg_type_ExternalAsciiString__EXTERNAL_ASCII_SYMBOL_TYPE", 0x46 },
- { "v8dbg_type_ExternalByteArray__EXTERNAL_BYTE_ARRAY_TYPE", 0x88 },
- { "v8dbg_type_ExternalFloatArray__EXTERNAL_FLOAT_ARRAY_TYPE", 0x8e },
- { "v8dbg_type_ExternalIntArray__EXTERNAL_INT_ARRAY_TYPE", 0x8c },
- { "v8dbg_type_ExternalShortArray__EXTERNAL_SHORT_ARRAY_TYPE", 0x8a },
- { "v8dbg_type_ExternalString__EXTERNAL_STRING_TYPE", 0x2 },
- { "v8dbg_type_ExternalString__EXTERNAL_SYMBOL_TYPE", 0x42 },
- { "v8dbg_type_ExternalUnsignedByteArray__"
- "EXTERNAL_UNSIGNED_BYTE_ARRAY_TYPE", 0x89 },
- { "v8dbg_type_ExternalUnsignedIntArray__"
- "EXTERNAL_UNSIGNED_INT_ARRAY_TYPE", 0x8d },
- { "v8dbg_type_ExternalUnsignedShortArray__"
- "EXTERNAL_UNSIGNED_SHORT_ARRAY_TYPE", 0x8b },
- { "v8dbg_type_FixedArray__FIXED_ARRAY_TYPE", 0x9c },
- { "v8dbg_type_FunctionTemplateInfo__"
- "FUNCTION_TEMPLATE_INFO_TYPE", 0x94 },
- { "v8dbg_type_HeapNumber__HEAP_NUMBER_TYPE", 0x84 },
- { "v8dbg_type_InterceptorInfo__INTERCEPTOR_INFO_TYPE", 0x92 },
- { "v8dbg_type_JSArray__JS_ARRAY_TYPE", 0xa5 },
- { "v8dbg_type_JSBuiltinsObject__JS_BUILTINS_OBJECT_TYPE", 0xa3 },
- { "v8dbg_type_JSFunction__JS_FUNCTION_TYPE", 0xa7 },
- { "v8dbg_type_JSGlobalObject__JS_GLOBAL_OBJECT_TYPE", 0xa2 },
- { "v8dbg_type_JSGlobalPropertyCell__"
- "JS_GLOBAL_PROPERTY_CELL_TYPE", 0x83 },
- { "v8dbg_type_JSGlobalProxy__JS_GLOBAL_PROXY_TYPE", 0xa4 },
- { "v8dbg_type_JSMessageObject__JS_MESSAGE_OBJECT_TYPE", 0x9e },
- { "v8dbg_type_JSObject__JS_OBJECT_TYPE", 0xa0 },
- { "v8dbg_type_JSRegExp__JS_REGEXP_TYPE", 0xa6 },
- { "v8dbg_type_JSValue__JS_VALUE_TYPE", 0x9f },
- { "v8dbg_type_Map__MAP_TYPE", 0x80 },
- { "v8dbg_type_ObjectTemplateInfo__OBJECT_TEMPLATE_INFO_TYPE", 0x95 },
- { "v8dbg_type_Oddball__ODDBALL_TYPE", 0x82 },
- { "v8dbg_type_Script__SCRIPT_TYPE", 0x98 },
- { "v8dbg_type_SeqAsciiString__ASCII_STRING_TYPE", 0x4 },
- { "v8dbg_type_SeqAsciiString__ASCII_SYMBOL_TYPE", 0x44 },
- { "v8dbg_type_SharedFunctionInfo__SHARED_FUNCTION_INFO_TYPE", 0x9d },
- { "v8dbg_type_SignatureInfo__SIGNATURE_INFO_TYPE", 0x96 },
- { "v8dbg_type_String__STRING_TYPE", 0x0 },
- { "v8dbg_type_String__SYMBOL_TYPE", 0x40 },
- { "v8dbg_type_TypeSwitchInfo__TYPE_SWITCH_INFO_TYPE", 0x97 },
-
- { "v8dbg_class_AccessCheckInfo__data__Object", 0xc },
- { "v8dbg_class_AccessCheckInfo__indexed_callback__Object", 0x8 },
- { "v8dbg_class_AccessCheckInfo__named_callback__Object", 0x4 },
- { "v8dbg_class_AccessorInfo__data__Object", 0xc },
- { "v8dbg_class_AccessorInfo__flag__Smi", 0x14 },
- { "v8dbg_class_AccessorInfo__getter__Object", 0x4 },
- { "v8dbg_class_AccessorInfo__name__Object", 0x10 },
- { "v8dbg_class_AccessorInfo__setter__Object", 0x8 },
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projects / platform / upstream / nodejs.git / commitdiff