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      1 // Copyright 2012 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 #ifndef V8_IC_INL_H_
     29 #define V8_IC_INL_H_
     30 
     31 #include "ic.h"
     32 
     33 #include "compiler.h"
     34 #include "debug.h"
     35 #include "macro-assembler.h"
     36 
     37 namespace v8 {
     38 namespace internal {
     39 
     40 
     41 Address IC::address() const {
     42   // Get the address of the call.
     43   Address result = Assembler::target_address_from_return_address(pc());
     44 
     45 #ifdef ENABLE_DEBUGGER_SUPPORT
     46   Debug* debug = isolate()->debug();
     47   // First check if any break points are active if not just return the address
     48   // of the call.
     49   if (!debug->has_break_points()) return result;
     50 
     51   // At least one break point is active perform additional test to ensure that
     52   // break point locations are updated correctly.
     53   if (debug->IsDebugBreak(Assembler::target_address_at(result))) {
     54     // If the call site is a call to debug break then return the address in
     55     // the original code instead of the address in the running code. This will
     56     // cause the original code to be updated and keeps the breakpoint active in
     57     // the running code.
     58     return OriginalCodeAddress();
     59   } else {
     60     // No break point here just return the address of the call.
     61     return result;
     62   }
     63 #else
     64   return result;
     65 #endif
     66 }
     67 
     68 
     69 Code* IC::GetTargetAtAddress(Address address) {
     70   // Get the target address of the IC.
     71   Address target = Assembler::target_address_at(address);
     72   // Convert target address to the code object. Code::GetCodeFromTargetAddress
     73   // is safe for use during GC where the map might be marked.
     74   Code* result = Code::GetCodeFromTargetAddress(target);
     75   ASSERT(result->is_inline_cache_stub());
     76   return result;
     77 }
     78 
     79 
     80 void IC::SetTargetAtAddress(Address address, Code* target) {
     81   ASSERT(target->is_inline_cache_stub() || target->is_compare_ic_stub());
     82   Heap* heap = target->GetHeap();
     83   Code* old_target = GetTargetAtAddress(address);
     84 #ifdef DEBUG
     85   // STORE_IC and KEYED_STORE_IC use Code::extra_ic_state() to mark
     86   // ICs as strict mode. The strict-ness of the IC must be preserved.
     87   if (old_target->kind() == Code::STORE_IC ||
     88       old_target->kind() == Code::KEYED_STORE_IC) {
     89     ASSERT(StoreIC::GetStrictMode(old_target->extra_ic_state()) ==
     90            StoreIC::GetStrictMode(target->extra_ic_state()));
     91   }
     92 #endif
     93   Assembler::set_target_address_at(address, target->instruction_start());
     94   if (heap->gc_state() == Heap::MARK_COMPACT) {
     95     heap->mark_compact_collector()->RecordCodeTargetPatch(address, target);
     96   } else {
     97     heap->incremental_marking()->RecordCodeTargetPatch(address, target);
     98   }
     99   PostPatching(address, target, old_target);
    100 }
    101 
    102 
    103 InlineCacheHolderFlag IC::GetCodeCacheForObject(Object* object) {
    104   if (object->IsJSObject()) return OWN_MAP;
    105 
    106   // If the object is a value, we use the prototype map for the cache.
    107   ASSERT(object->IsString() || object->IsSymbol() ||
    108          object->IsNumber() || object->IsBoolean());
    109   return PROTOTYPE_MAP;
    110 }
    111 
    112 
    113 HeapObject* IC::GetCodeCacheHolder(Isolate* isolate,
    114                                  Object* object,
    115                                  InlineCacheHolderFlag holder) {
    116   if (object->IsSmi()) holder = PROTOTYPE_MAP;
    117   Object* map_owner = holder == OWN_MAP
    118       ? object : object->GetPrototype(isolate);
    119   return HeapObject::cast(map_owner);
    120 }
    121 
    122 
    123 InlineCacheHolderFlag IC::GetCodeCacheFlag(Type* type) {
    124   if (type->Is(Type::Boolean()) ||
    125       type->Is(Type::Number()) ||
    126       type->Is(Type::String()) ||
    127       type->Is(Type::Symbol())) {
    128     return PROTOTYPE_MAP;
    129   }
    130   return OWN_MAP;
    131 }
    132 
    133 
    134 Handle<Map> IC::GetCodeCacheHolder(InlineCacheHolderFlag flag,
    135                                    Type* type,
    136                                    Isolate* isolate) {
    137   if (flag == PROTOTYPE_MAP) {
    138     Context* context = isolate->context()->native_context();
    139     JSFunction* constructor;
    140     if (type->Is(Type::Boolean())) {
    141       constructor = context->boolean_function();
    142     } else if (type->Is(Type::Number())) {
    143       constructor = context->number_function();
    144     } else if (type->Is(Type::String())) {
    145       constructor = context->string_function();
    146     } else {
    147       ASSERT(type->Is(Type::Symbol()));
    148       constructor = context->symbol_function();
    149     }
    150     return handle(JSObject::cast(constructor->instance_prototype())->map());
    151   }
    152   return TypeToMap(type, isolate);
    153 }
    154 
    155 
    156 } }  // namespace v8::internal
    157 
    158 #endif  // V8_IC_INL_H_
    159