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      1 // Copyright 2009 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #include "v8.h"
     29 
     30 #include "ic-inl.h"
     31 #include "objects-visiting.h"
     32 
     33 namespace v8 {
     34 namespace internal {
     35 
     36 
     37 static inline bool IsShortcutCandidate(int type) {
     38   return ((type & kShortcutTypeMask) == kShortcutTypeTag);
     39 }
     40 
     41 
     42 StaticVisitorBase::VisitorId StaticVisitorBase::GetVisitorId(
     43     int instance_type,
     44     int instance_size) {
     45   if (instance_type < FIRST_NONSTRING_TYPE) {
     46     switch (instance_type & kStringRepresentationMask) {
     47       case kSeqStringTag:
     48         if ((instance_type & kStringEncodingMask) == kAsciiStringTag) {
     49           return kVisitSeqAsciiString;
     50         } else {
     51           return kVisitSeqTwoByteString;
     52         }
     53 
     54       case kConsStringTag:
     55         if (IsShortcutCandidate(instance_type)) {
     56           return kVisitShortcutCandidate;
     57         } else {
     58           return kVisitConsString;
     59         }
     60 
     61       case kExternalStringTag:
     62         return GetVisitorIdForSize(kVisitDataObject,
     63                                    kVisitDataObjectGeneric,
     64                                    ExternalString::kSize);
     65     }
     66     UNREACHABLE();
     67   }
     68 
     69   switch (instance_type) {
     70     case BYTE_ARRAY_TYPE:
     71       return kVisitByteArray;
     72 
     73     case FIXED_ARRAY_TYPE:
     74       return kVisitFixedArray;
     75 
     76     case ODDBALL_TYPE:
     77       return kVisitOddball;
     78 
     79     case MAP_TYPE:
     80       return kVisitMap;
     81 
     82     case CODE_TYPE:
     83       return kVisitCode;
     84 
     85     case JS_GLOBAL_PROPERTY_CELL_TYPE:
     86       return kVisitPropertyCell;
     87 
     88     case SHARED_FUNCTION_INFO_TYPE:
     89       return kVisitSharedFunctionInfo;
     90 
     91     case PROXY_TYPE:
     92       return GetVisitorIdForSize(kVisitDataObject,
     93                                  kVisitDataObjectGeneric,
     94                                  Proxy::kSize);
     95 
     96     case FILLER_TYPE:
     97       return kVisitDataObjectGeneric;
     98 
     99     case JS_OBJECT_TYPE:
    100     case JS_CONTEXT_EXTENSION_OBJECT_TYPE:
    101     case JS_VALUE_TYPE:
    102     case JS_ARRAY_TYPE:
    103     case JS_REGEXP_TYPE:
    104     case JS_GLOBAL_PROXY_TYPE:
    105     case JS_GLOBAL_OBJECT_TYPE:
    106     case JS_BUILTINS_OBJECT_TYPE:
    107     case JS_MESSAGE_OBJECT_TYPE:
    108       return GetVisitorIdForSize(kVisitJSObject,
    109                                  kVisitJSObjectGeneric,
    110                                  instance_size);
    111 
    112     case JS_FUNCTION_TYPE:
    113       return kVisitJSFunction;
    114 
    115     case HEAP_NUMBER_TYPE:
    116     case EXTERNAL_PIXEL_ARRAY_TYPE:
    117     case EXTERNAL_BYTE_ARRAY_TYPE:
    118     case EXTERNAL_UNSIGNED_BYTE_ARRAY_TYPE:
    119     case EXTERNAL_SHORT_ARRAY_TYPE:
    120     case EXTERNAL_UNSIGNED_SHORT_ARRAY_TYPE:
    121     case EXTERNAL_INT_ARRAY_TYPE:
    122     case EXTERNAL_UNSIGNED_INT_ARRAY_TYPE:
    123     case EXTERNAL_FLOAT_ARRAY_TYPE:
    124       return GetVisitorIdForSize(kVisitDataObject,
    125                                  kVisitDataObjectGeneric,
    126                                  instance_size);
    127 
    128 #define MAKE_STRUCT_CASE(NAME, Name, name) \
    129         case NAME##_TYPE:
    130       STRUCT_LIST(MAKE_STRUCT_CASE)
    131 #undef MAKE_STRUCT_CASE
    132           return GetVisitorIdForSize(kVisitStruct,
    133                                      kVisitStructGeneric,
    134                                      instance_size);
    135 
    136     default:
    137       UNREACHABLE();
    138       return kVisitorIdCount;
    139   }
    140 }
    141 
    142 } }  // namespace v8::internal
    143