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f496e538f4
This is the next step towards preventing compiler from directly peeking into runtime and instead interact with runtime through a well defined surface. The goal of the refactoring to locate all places where compiler accesses some runtime information and partion those accesses into two categories: - creating objects in the host runtime (e.g. allocating strings, numbers, etc) during compilation; - accessing properties of the target runtime (e.g. offsets of fields) to embed those into the generated code; This change introduces dart::compiler and dart::compiler::target namespaces. All code in the compiler will gradually be moved into dart::compiler namespace. One of the motivations for this change is to be able to prevent access to globally defined host constants like kWordSize by shadowing them in the dart::compiler namespace. The nested namespace dart::compiler::target hosts all information about target runtime that compiler could access, e.g. compiler::target::kWordSize defines word size of the target which will eventually be made different from the host kWordSize (defined by dart::kWordSize). The API for compiler to runtime interaction is placed into compiler_api.h. Note that we still permit runtime to access compiler internals directly - this is not going to be decoupled as part of this work. Issue https://github.com/dart-lang/sdk/issues/31709 Change-Id: If4396d295879391becfa6c38d4802bbff81f5b20 Reviewed-on: https://dart-review.googlesource.com/c/90242 Commit-Queue: Vyacheslav Egorov <vegorov@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>
78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_BITMAP_H_
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#define RUNTIME_VM_BITMAP_H_
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#include "vm/allocation.h"
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#include "vm/thread_state.h"
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#include "vm/zone.h"
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namespace dart {
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// BitmapBuilder is used to build a bitmap. The implementation is optimized
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// for a dense set of small bit maps without a fixed upper bound (e.g: a
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// pointer map description of a stack).
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class BitmapBuilder : public ZoneAllocated {
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public:
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BitmapBuilder()
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: length_(0),
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data_size_in_bytes_(kInitialSizeInBytes),
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data_(ThreadState::Current()->zone()->Alloc<uint8_t>(
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kInitialSizeInBytes)) {
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memset(data_, 0, kInitialSizeInBytes);
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}
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intptr_t Length() const { return length_; }
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void SetLength(intptr_t length);
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// Get/Set individual bits in the bitmap, setting bits beyond the bitmap's
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// length increases the length and expands the underlying bitmap if
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// needed.
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bool Get(intptr_t bit_offset) const;
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void Set(intptr_t bit_offset, bool value);
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// Return the bit offset of the highest bit set.
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intptr_t Maximum() const;
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// Return the bit offset of the lowest bit set.
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intptr_t Minimum() const;
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// Sets min..max (inclusive) to value.
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void SetRange(intptr_t min, intptr_t max, bool value);
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void Print() const;
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private:
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static const intptr_t kInitialSizeInBytes = 16;
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static const intptr_t kIncrementSizeInBytes = 16;
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bool InRange(intptr_t offset) const {
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if (offset < 0) {
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FATAL1(
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"Fatal error in BitmapBuilder::InRange :"
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" invalid bit_offset, %" Pd "\n",
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offset);
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}
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return (offset < length_);
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}
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// Get/Set a bit that is known to be covered by the backing store.
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bool GetBit(intptr_t bit_offset) const;
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void SetBit(intptr_t bit_offset, bool value);
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intptr_t length_;
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// Backing store for the bitmap. Reading bits beyond the backing store
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// (up to length_) is allowed and they are assumed to be false.
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intptr_t data_size_in_bytes_;
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uint8_t* data_;
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DISALLOW_COPY_AND_ASSIGN(BitmapBuilder);
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};
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} // namespace dart
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#endif // RUNTIME_VM_BITMAP_H_
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