1 // Copyright 2006-2008 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 #include "debug.h"
33 #include "macro-assembler.h"
34
35 namespace v8 {
36 namespace internal {
37
38
address()39 Address IC::address() {
40 // Get the address of the call.
41 Address result = pc() - Assembler::kCallTargetAddressOffset;
42
43 #ifdef ENABLE_DEBUGGER_SUPPORT
44 Debug* debug = Isolate::Current()->debug();
45 // First check if any break points are active if not just return the address
46 // of the call.
47 if (!debug->has_break_points()) return result;
48
49 // At least one break point is active perform additional test to ensure that
50 // break point locations are updated correctly.
51 if (debug->IsDebugBreak(Assembler::target_address_at(result))) {
52 // If the call site is a call to debug break then return the address in
53 // the original code instead of the address in the running code. This will
54 // cause the original code to be updated and keeps the breakpoint active in
55 // the running code.
56 return OriginalCodeAddress();
57 } else {
58 // No break point here just return the address of the call.
59 return result;
60 }
61 #else
62 return result;
63 #endif
64 }
65
66
GetTargetAtAddress(Address address)67 Code* IC::GetTargetAtAddress(Address address) {
68 // Get the target address of the IC.
69 Address target = Assembler::target_address_at(address);
70 // Convert target address to the code object. Code::GetCodeFromTargetAddress
71 // is safe for use during GC where the map might be marked.
72 Code* result = Code::GetCodeFromTargetAddress(target);
73 ASSERT(result->is_inline_cache_stub());
74 return result;
75 }
76
77
SetTargetAtAddress(Address address,Code * target)78 void IC::SetTargetAtAddress(Address address, Code* target) {
79 ASSERT(target->is_inline_cache_stub() || target->is_compare_ic_stub());
80 #ifdef DEBUG
81 // STORE_IC and KEYED_STORE_IC use Code::extra_ic_state() to mark
82 // ICs as strict mode. The strict-ness of the IC must be preserved.
83 Code* old_target = GetTargetAtAddress(address);
84 if (old_target->kind() == Code::STORE_IC ||
85 old_target->kind() == Code::KEYED_STORE_IC) {
86 ASSERT(old_target->extra_ic_state() == target->extra_ic_state());
87 }
88 #endif
89 Assembler::set_target_address_at(address, target->instruction_start());
90 }
91
92
GetCodeCacheForObject(Object * object,JSObject * holder)93 InlineCacheHolderFlag IC::GetCodeCacheForObject(Object* object,
94 JSObject* holder) {
95 if (object->IsJSObject()) {
96 return GetCodeCacheForObject(JSObject::cast(object), holder);
97 }
98 // If the object is a value, we use the prototype map for the cache.
99 ASSERT(object->IsString() || object->IsNumber() || object->IsBoolean());
100 return PROTOTYPE_MAP;
101 }
102
103
GetCodeCacheForObject(JSObject * object,JSObject * holder)104 InlineCacheHolderFlag IC::GetCodeCacheForObject(JSObject* object,
105 JSObject* holder) {
106 // Fast-properties and global objects store stubs in their own maps.
107 // Slow properties objects use prototype's map (unless the property is its own
108 // when holder == object). It works because slow properties objects having
109 // the same prototype (or a prototype with the same map) and not having
110 // the property are interchangeable for such a stub.
111 if (holder != object &&
112 !object->HasFastProperties() &&
113 !object->IsJSGlobalProxy() &&
114 !object->IsJSGlobalObject()) {
115 return PROTOTYPE_MAP;
116 }
117 return OWN_MAP;
118 }
119
120
GetCodeCacheHolder(Object * object,InlineCacheHolderFlag holder)121 JSObject* IC::GetCodeCacheHolder(Object* object, InlineCacheHolderFlag holder) {
122 Object* map_owner = (holder == OWN_MAP ? object : object->GetPrototype());
123 ASSERT(map_owner->IsJSObject());
124 return JSObject::cast(map_owner);
125 }
126
127
128 } } // namespace v8::internal
129
130 #endif // V8_IC_INL_H_
131