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
address()41 Address IC::address() const {
42 // Get the address of the call.
43 Address result = pc() - Assembler::kCallTargetAddressOffset;
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
GetTargetAtAddress(Address address)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
SetTargetAtAddress(Address address,Code * target)80 void IC::SetTargetAtAddress(Address address, Code* target) {
81 ASSERT(target->is_inline_cache_stub() || target->is_compare_ic_stub());
82 Code* old_target = GetTargetAtAddress(address);
83 #ifdef DEBUG
84 // STORE_IC and KEYED_STORE_IC use Code::extra_ic_state() to mark
85 // ICs as strict mode. The strict-ness of the IC must be preserved.
86 if (old_target->kind() == Code::STORE_IC ||
87 old_target->kind() == Code::KEYED_STORE_IC) {
88 ASSERT(Code::GetStrictMode(old_target->extra_ic_state()) ==
89 Code::GetStrictMode(target->extra_ic_state()));
90 }
91 #endif
92 Assembler::set_target_address_at(address, target->instruction_start());
93 target->GetHeap()->incremental_marking()->RecordCodeTargetPatch(address,
94 target);
95 PostPatching(address, target, old_target);
96 }
97
98
GetCodeCacheForObject(Object * object,JSObject * holder)99 InlineCacheHolderFlag IC::GetCodeCacheForObject(Object* object,
100 JSObject* holder) {
101 if (object->IsJSObject()) {
102 return GetCodeCacheForObject(JSObject::cast(object), holder);
103 }
104 // If the object is a value, we use the prototype map for the cache.
105 ASSERT(object->IsString() || object->IsNumber() || object->IsBoolean());
106 return PROTOTYPE_MAP;
107 }
108
109
GetCodeCacheForObject(JSObject * object,JSObject * holder)110 InlineCacheHolderFlag IC::GetCodeCacheForObject(JSObject* object,
111 JSObject* holder) {
112 // Fast-properties and global objects store stubs in their own maps.
113 // Slow properties objects use prototype's map (unless the property is its own
114 // when holder == object). It works because slow properties objects having
115 // the same prototype (or a prototype with the same map) and not having
116 // the property are interchangeable for such a stub.
117 if (holder != object &&
118 !object->HasFastProperties() &&
119 !object->IsJSGlobalProxy() &&
120 !object->IsJSGlobalObject()) {
121 return PROTOTYPE_MAP;
122 }
123 return OWN_MAP;
124 }
125
126
GetCodeCacheHolder(Object * object,InlineCacheHolderFlag holder)127 JSObject* IC::GetCodeCacheHolder(Object* object, InlineCacheHolderFlag holder) {
128 Object* map_owner = (holder == OWN_MAP ? object : object->GetPrototype());
129 ASSERT(map_owner->IsJSObject());
130 return JSObject::cast(map_owner);
131 }
132
133
134 } } // namespace v8::internal
135
136 #endif // V8_IC_INL_H_
137