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authorYang Zhang <yang.z.zhang@intel.com>2015-08-28 09:58:54 +0800
committerYang Zhang <yang.z.zhang@intel.com>2015-09-01 12:44:00 +0800
commite44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch)
tree66b09f592c55df2878107a468a91d21506104d3f /qemu/disas/libvixl/code-buffer.h
parent9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff)
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5 Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
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+// 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
+