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ic-inl.h
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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 
42  // Get the address of the call.
44 
45 #ifdef ENABLE_DEBUGGER_SUPPORT
46  Debug* debug = Isolate::Current()->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 
70  // Get the target address of the IC.
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(Code::GetStrictMode(old_target->extra_ic_state()) ==
91  }
92 #endif
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 
104  JSObject* holder) {
105  if (object->IsJSObject()) {
106  return GetCodeCacheForObject(JSObject::cast(object), holder);
107  }
108  // If the object is a value, we use the prototype map for the cache.
109  ASSERT(object->IsString() || object->IsNumber() || object->IsBoolean());
110  return PROTOTYPE_MAP;
111 }
112 
113 
115  JSObject* holder) {
116  // Fast-properties and global objects store stubs in their own maps.
117  // Slow properties objects use prototype's map (unless the property is its own
118  // when holder == object). It works because slow properties objects having
119  // the same prototype (or a prototype with the same map) and not having
120  // the property are interchangeable for such a stub.
121  if (holder != object &&
122  !object->HasFastProperties() &&
123  !object->IsJSGlobalProxy() &&
124  !object->IsJSGlobalObject()) {
125  return PROTOTYPE_MAP;
126  }
127  return OWN_MAP;
128 }
129 
130 
132  Object* map_owner = (holder == OWN_MAP ? object : object->GetPrototype());
133  ASSERT(map_owner->IsJSObject());
134  return JSObject::cast(map_owner);
135 }
136 
137 
138 } } // namespace v8::internal
139 
140 #endif // V8_IC_INL_H_
byte * Address
Definition: globals.h:157
Code * target() const
Definition: ic.h:97
Address address() const
Definition: ic-inl.h:41
#define ASSERT(condition)
Definition: checks.h:270
static void PostPatching(Address address, Code *target, Code *old_target)
Definition: ic.cc:309
Address pc() const
Definition: ic.h:139
byte * instruction_start()
Definition: objects-inl.h:4649
static StrictModeFlag GetStrictMode(ExtraICState extra_ic_state)
Definition: objects.h:4414
static Code * GetTargetAtAddress(Address address)
Definition: ic-inl.h:69
static void set_target_address_at(Address pc, Address target)
static Code * GetCodeFromTargetAddress(Address address)
Definition: objects-inl.h:3559
bool is_inline_cache_stub()
Definition: objects-inl.h:3485
static Address target_address_at(Address pc)
bool is_compare_ic_stub()
Definition: objects.h:4305
ExtraICState extra_ic_state()
Definition: objects-inl.h:3181
static Address target_address_from_return_address(Address pc)
static JSObject * GetCodeCacheHolder(Object *object, InlineCacheHolderFlag holder)
Definition: ic-inl.h:131
static void SetTargetAtAddress(Address address, Code *target)
Definition: ic-inl.h:80
static InlineCacheHolderFlag GetCodeCacheForObject(Object *object, JSObject *holder)
Definition: ic-inl.h:103
static JSObject * cast(Object *obj)