6aea44fc2b
Update our copy of libvixl to upstream 1.6. There are no changes of any particular interest to QEMU, so this is simply keeping up with current upstream. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1412091418-25744-1-git-send-email-peter.maydell@linaro.org
114 lines
3.7 KiB
C++
114 lines
3.7 KiB
C++
// Copyright 2014, ARM Limited
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of ARM Limited nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef VIXL_CODE_BUFFER_H
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#define VIXL_CODE_BUFFER_H
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#include <string.h>
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#include "globals.h"
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namespace vixl {
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class CodeBuffer {
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public:
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explicit CodeBuffer(size_t capacity = 4 * KBytes);
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CodeBuffer(void* buffer, size_t capacity);
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~CodeBuffer();
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void Reset();
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ptrdiff_t OffsetFrom(ptrdiff_t offset) const {
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ptrdiff_t cursor_offset = cursor_ - buffer_;
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VIXL_ASSERT((offset >= 0) && (offset <= cursor_offset));
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return cursor_offset - offset;
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}
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ptrdiff_t CursorOffset() const {
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return OffsetFrom(0);
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}
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template <typename T>
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T GetOffsetAddress(ptrdiff_t offset) const {
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VIXL_ASSERT((offset >= 0) && (offset <= (cursor_ - buffer_)));
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return reinterpret_cast<T>(buffer_ + offset);
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}
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size_t RemainingBytes() const {
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VIXL_ASSERT((cursor_ >= buffer_) && (cursor_ <= (buffer_ + capacity_)));
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return (buffer_ + capacity_) - cursor_;
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}
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// A code buffer can emit:
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// * 32-bit data: instruction and constant.
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// * 64-bit data: constant.
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// * string: debug info.
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void Emit32(uint32_t data) { Emit(data); }
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void Emit64(uint64_t data) { Emit(data); }
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void EmitString(const char* string);
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// Align to kInstructionSize.
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void Align();
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size_t capacity() const { return capacity_; }
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bool IsManaged() const { return managed_; }
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void Grow(size_t new_capacity);
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bool IsDirty() const { return dirty_; }
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void SetClean() { dirty_ = false; }
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private:
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template <typename T>
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void Emit(T value) {
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VIXL_ASSERT(RemainingBytes() >= sizeof(value));
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dirty_ = true;
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memcpy(cursor_, &value, sizeof(value));
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cursor_ += sizeof(value);
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}
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// Backing store of the buffer.
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byte* buffer_;
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// If true the backing store is allocated and deallocated by the buffer. The
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// backing store can then grow on demand. If false the backing store is
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// provided by the user and cannot be resized internally.
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bool managed_;
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// Pointer to the next location to be written.
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byte* cursor_;
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// True if there has been any write since the buffer was created or cleaned.
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bool dirty_;
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// Capacity in bytes of the backing store.
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size_t capacity_;
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};
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} // namespace vixl
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#endif // VIXL_CODE_BUFFER_H
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