Index: src/interpreter/constant-array-builder.cc |
diff --git a/src/interpreter/constant-array-builder.cc b/src/interpreter/constant-array-builder.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..18fbfd609c44ffe36f5d4be5f2d625bb2cc11cfa |
--- /dev/null |
+++ b/src/interpreter/constant-array-builder.cc |
@@ -0,0 +1,193 @@ |
+// Copyright 2015 the V8 project authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "src/interpreter/constant-array-builder.h" |
+ |
+#include "src/isolate.h" |
+#include "src/objects-inl.h" |
+ |
+namespace v8 { |
+namespace internal { |
+namespace interpreter { |
+ |
+ConstantArrayBuilder::ConstantArraySlice::ConstantArraySlice(Zone* zone, |
+ int width) |
rmcilroy
2016/01/04 17:05:48
The width thing is a bit complex - I think it woul
oth
2016/01/05 09:30:08
Yes, this shouldn't have been left in.
|
+ : width_(width), reserved_(0), constants_(zone) {} |
+ |
+ |
+size_t ConstantArrayBuilder::ConstantArraySlice::reserved() const { |
+ return reserved_; |
+} |
+ |
+ |
+size_t ConstantArrayBuilder::ConstantArraySlice::size() const { |
+ return constants_.size(); |
+} |
+ |
+ |
+size_t ConstantArrayBuilder::ConstantArraySlice::free() const { |
rmcilroy
2016/01/04 17:05:48
free is a bit of an overloaded name. How about rem
oth
2016/01/05 09:30:08
Glass half-full? available() :-)
rmcilroy
2016/01/05 13:46:10
SGTM :).
|
+ return capacity() - reserved_ - constants_.size(); |
+} |
+ |
+ |
+size_t ConstantArrayBuilder::ConstantArraySlice::start_index() const { |
+ size_t shift = 8u * (width_ - 1u); |
+ return (static_cast<size_t>(1) << shift) & ~0xffu; |
+} |
+ |
+ |
+size_t ConstantArrayBuilder::ConstantArraySlice::capacity() const { |
+ size_t shift = 8u * width_; |
+ return (static_cast<size_t>(1) << shift) - start_index(); |
+} |
+ |
+ |
+void ConstantArrayBuilder::ConstantArraySlice::reserve() { |
+ DCHECK_GT(free(), 0u); |
+ reserved_++; |
+ DCHECK_LE(reserved_, capacity() - constants_.size()); |
+} |
+ |
+ |
+void ConstantArrayBuilder::ConstantArraySlice::unreserve() { |
+ DCHECK_GT(reserved_, 0u); |
+ reserved_--; |
+} |
+ |
+ |
+size_t ConstantArrayBuilder::ConstantArraySlice::allocate( |
+ Handle<Object> object) { |
+ DCHECK_GT(free(), 0u); |
+ size_t index = constants_.size(); |
+ DCHECK_LT(index, capacity()); |
+ constants_.push_back(object); |
+ return index + start_index(); |
+} |
+ |
+ |
+Handle<Object> ConstantArrayBuilder::ConstantArraySlice::at( |
+ size_t index) const { |
+ return constants_[index - start_index()]; |
+} |
+ |
+ |
+STATIC_CONST_MEMBER_DEFINITION const size_t ConstantArrayBuilder::kMaxCapacity; |
+STATIC_CONST_MEMBER_DEFINITION const size_t ConstantArrayBuilder::kLowCapacity; |
rmcilroy
2016/01/04 17:05:48
Do you need these? I didn't think you needed them
oth
2016/01/05 09:30:08
Yes, both external linkage and taking the constant
|
+ |
+ |
+ConstantArrayBuilder::ConstantArrayBuilder(Isolate* isolate, Zone* zone) |
+ : isolate_(isolate), |
+ idx8_slice_(zone, 1), |
+ idx16_slice_(zone, 2), |
+ constants_map_(isolate->heap(), zone) { |
+ DCHECK_EQ(idx8_slice_.start_index(), 0u); |
+ DCHECK_EQ(idx8_slice_.capacity(), kLowCapacity); |
+ DCHECK_EQ(idx16_slice_.start_index(), kLowCapacity); |
+ DCHECK_EQ(idx16_slice_.capacity(), kMaxCapacity - kLowCapacity); |
+} |
+ |
+ |
+size_t ConstantArrayBuilder::size() const { |
+ if (idx16_slice_.size() > 0) { |
+ return idx16_slice_.start_index() + idx16_slice_.size(); |
+ } else { |
+ return idx8_slice_.size(); |
+ } |
+} |
+ |
+ |
+Handle<Object> ConstantArrayBuilder::at(size_t index) const { |
+ if (index >= idx16_slice_.start_index()) { |
+ return idx16_slice_.at(index); |
+ } else if (index < idx8_slice_.size()) { |
+ return idx8_slice_.at(index); |
+ } else { |
+ return isolate_->factory()->the_hole_value(); |
+ } |
+} |
+ |
+ |
+Handle<FixedArray> ConstantArrayBuilder::ToFixedArray( |
+ Factory* factory, PretenureFlag pretenure) const { |
+ Handle<FixedArray> fixed_array = |
+ factory->NewFixedArray(static_cast<int>(size()), pretenure); |
+ for (int i = 0; i < fixed_array->length(); i++) { |
+ fixed_array->set(i, *at(static_cast<size_t>(i))); |
+ } |
+ return fixed_array; |
+} |
+ |
+ |
+size_t ConstantArrayBuilder::Insert(Handle<Object> object) { |
+ index_t* entry = constants_map_.Find(object); |
+ return (entry == nullptr) ? AllocateEntry(object) : *entry; |
+} |
+ |
+ |
+ConstantArrayBuilder::index_t ConstantArrayBuilder::AllocateEntry( |
+ Handle<Object> object) { |
+ DCHECK(!object->IsOddball()); |
+ size_t index; |
+ index_t* entry = constants_map_.Get(object); |
+ if (idx8_slice_.free() > 0) { |
+ index = idx8_slice_.allocate(object); |
+ DCHECK_LT(index, idx8_slice_.capacity()); |
+ } else { |
+ index = idx16_slice_.allocate(object); |
+ DCHECK_LT(index, idx8_slice_.capacity() + idx16_slice_.capacity()); |
+ } |
+ *entry = static_cast<index_t>(index); |
+ return *entry; |
+} |
+ |
+ |
+ConstantArrayBuilder::ReservationToken |
+ConstantArrayBuilder::CreateReservedEntry() { |
+ if (idx8_slice_.free() > 0) { |
+ idx8_slice_.reserve(); |
+ return ReservationToken::kIdx8; |
+ } else { |
+ idx16_slice_.reserve(); |
+ return ReservationToken::kIdx16; |
+ } |
+} |
+ |
+ |
+size_t ConstantArrayBuilder::CommitReservedEntry(ReservationToken token, |
+ Handle<Object> object) { |
+ DiscardReservedEntry(token); |
+ size_t index; |
+ index_t* entry = constants_map_.Find(object); |
+ if (nullptr == entry) { |
+ index = AllocateEntry(object); |
+ } else { |
+ if (token == ReservationToken::kIdx8 && *entry >= idx8_slice_.capacity()) { |
rmcilroy
2016/01/04 17:05:48
Could the opposite happen (token == kIdx16 but we
oth
2016/01/05 09:30:08
If the opposite happens it doesn't matter. The byt
|
+ // The object is already in the constant array, but has an index |
+ // outside the range of an idx8 operand so we need to create a |
+ // duplicate entry in the idx8 operand range to satisfy the |
+ // commitment. |
+ *entry = static_cast<index_t>(idx8_slice_.allocate(object)); |
+ } |
+ index = *entry; |
+ } |
+ DCHECK(token == ReservationToken::kIdx16 || index < idx8_slice_.capacity()); |
+ DCHECK_LT(index, kMaxCapacity); |
+ return index; |
+} |
+ |
+ |
+void ConstantArrayBuilder::DiscardReservedEntry(ReservationToken token) { |
+ switch (token) { |
+ case ReservationToken::kIdx8: |
+ idx8_slice_.unreserve(); |
+ return; |
+ case ReservationToken::kIdx16: |
+ idx16_slice_.unreserve(); |
+ return; |
+ } |
+} |
+ |
+} // namespace interpreter |
+} // namespace internal |
+} // namespace v8 |