+++ /dev/null
-// Copyright 2014, ARM Limited
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are met:
-//
-// * Redistributions of source code must retain the above copyright notice,
-// this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above copyright notice,
-// this list of conditions and the following disclaimer in the documentation
-// and/or other materials provided with the distribution.
-// * Neither the name of ARM Limited nor the names of its contributors may be
-// used to endorse or promote products derived from this software without
-// specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
-// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
-// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef VIXL_CODE_BUFFER_H
-#define VIXL_CODE_BUFFER_H
-
-#include <string.h>
-#include "globals.h"
-
-namespace vixl {
-
-class CodeBuffer {
- public:
- explicit CodeBuffer(size_t capacity = 4 * KBytes);
- CodeBuffer(void* buffer, size_t capacity);
- ~CodeBuffer();
-
- void Reset();
-
- ptrdiff_t OffsetFrom(ptrdiff_t offset) const {
- ptrdiff_t cursor_offset = cursor_ - buffer_;
- VIXL_ASSERT((offset >= 0) && (offset <= cursor_offset));
- return cursor_offset - offset;
- }
-
- ptrdiff_t CursorOffset() const {
- return OffsetFrom(0);
- }
-
- template <typename T>
- T GetOffsetAddress(ptrdiff_t offset) const {
- VIXL_ASSERT((offset >= 0) && (offset <= (cursor_ - buffer_)));
- return reinterpret_cast<T>(buffer_ + offset);
- }
-
- size_t RemainingBytes() const {
- VIXL_ASSERT((cursor_ >= buffer_) && (cursor_ <= (buffer_ + capacity_)));
- return (buffer_ + capacity_) - cursor_;
- }
-
- // A code buffer can emit:
- // * 32-bit data: instruction and constant.
- // * 64-bit data: constant.
- // * string: debug info.
- void Emit32(uint32_t data) { Emit(data); }
-
- void Emit64(uint64_t data) { Emit(data); }
-
- void EmitString(const char* string);
-
- // Align to kInstructionSize.
- void Align();
-
- size_t capacity() const { return capacity_; }
-
- bool IsManaged() const { return managed_; }
-
- void Grow(size_t new_capacity);
-
- bool IsDirty() const { return dirty_; }
-
- void SetClean() { dirty_ = false; }
-
- private:
- template <typename T>
- void Emit(T value) {
- VIXL_ASSERT(RemainingBytes() >= sizeof(value));
- dirty_ = true;
- memcpy(cursor_, &value, sizeof(value));
- cursor_ += sizeof(value);
- }
-
- // Backing store of the buffer.
- byte* buffer_;
- // If true the backing store is allocated and deallocated by the buffer. The
- // backing store can then grow on demand. If false the backing store is
- // provided by the user and cannot be resized internally.
- bool managed_;
- // Pointer to the next location to be written.
- byte* cursor_;
- // True if there has been any write since the buffer was created or cleaned.
- bool dirty_;
- // Capacity in bytes of the backing store.
- size_t capacity_;
-};
-
-} // namespace vixl
-
-#endif // VIXL_CODE_BUFFER_H
-
Code Review / kvmfornfv.git / blobdiff