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zone-inl.h
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27 
28 #ifndef V8_ZONE_INL_H_
29 #define V8_ZONE_INL_H_
30 
31 #include "zone.h"
32 
33 #include "counters.h"
34 #include "isolate.h"
35 #include "utils.h"
36 #include "v8-counters.h"
37 
38 namespace v8 {
39 namespace internal {
40 
41 
42 inline void* Zone::New(int size) {
43  ASSERT(scope_nesting_ > 0);
44  // Round up the requested size to fit the alignment.
45  size = RoundUp(size, kAlignment);
46 
47  // If the allocation size is divisible by 8 then we return an 8-byte aligned
48  // address.
49  if (kPointerSize == 4 && kAlignment == 4) {
50  position_ += ((~size) & 4) & (reinterpret_cast<intptr_t>(position_) & 4);
51  } else {
52  ASSERT(kAlignment >= kPointerSize);
53  }
54 
55  // Check if the requested size is available without expanding.
56  Address result = position_;
57 
58  if (size > limit_ - position_) {
59  result = NewExpand(size);
60  } else {
61  position_ += size;
62  }
63 
64  // Check that the result has the proper alignment and return it.
65  ASSERT(IsAddressAligned(result, kAlignment, 0));
66  allocation_size_ += size;
67  return reinterpret_cast<void*>(result);
68 }
69 
70 
71 template <typename T>
72 T* Zone::NewArray(int length) {
73  return static_cast<T*>(New(length * sizeof(T)));
74 }
75 
76 
78  return segment_bytes_allocated_ > zone_excess_limit_;
79 }
80 
81 
83  segment_bytes_allocated_ += delta;
84  isolate_->counters()->zone_segment_bytes()->Set(segment_bytes_allocated_);
85 }
86 
87 
88 template <typename Config>
90  // Reset the root to avoid unneeded iteration over all tree nodes
91  // in the destructor. For a zone-allocated tree, nodes will be
92  // freed by the Zone.
94 }
95 
96 
97 void* ZoneObject::operator new(size_t size, Zone* zone) {
98  return zone->New(static_cast<int>(size));
99 }
100 
101 inline void* ZoneAllocationPolicy::New(size_t size) {
102  ASSERT(zone_);
103  return zone_->New(static_cast<int>(size));
104 }
105 
106 
107 template <typename T>
108 void* ZoneList<T>::operator new(size_t size, Zone* zone) {
109  return zone->New(static_cast<int>(size));
110 }
111 
112 
113 ZoneScope::ZoneScope(Zone* zone, ZoneScopeMode mode)
114  : zone_(zone), mode_(mode) {
115  zone_->scope_nesting_++;
116 }
117 
118 
119 bool ZoneScope::ShouldDeleteOnExit() {
120  return zone_->scope_nesting_ == 1 && mode_ == DELETE_ON_EXIT;
121 }
122 
123 
124 } } // namespace v8::internal
125 
126 #endif // V8_ZONE_INL_H_
byte * Address
Definition: globals.h:157
bool IsAddressAligned(Address addr, intptr_t alignment, int offset=0)
Definition: utils.h:212
bool excess_allocation()
Definition: zone-inl.h:77
#define ASSERT(condition)
Definition: checks.h:270
const int kPointerSize
Definition: globals.h:220
static unsigned allocation_size_
Definition: zone.h:91
T RoundUp(T x, intptr_t m)
Definition: utils.h:150
void adjust_segment_bytes_allocated(int delta)
Definition: zone-inl.h:82
T * NewArray(int length)
Definition: zone-inl.h:72
#define T(name, string, precedence)
Definition: token.cc:48
ZoneScopeMode
Definition: zone.h:44
Counters * counters()
Definition: isolate.h:819
void * New(int size)
Definition: zone-inl.h:42