dep: Add vixl (AArch32/64 assembler)

dep/vixl/include/vixl/assembler-base-vixl.h

@@ -0,0 +1,101 @@
+// Copyright 2016, VIXL authors
+// 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_ASSEMBLER_BASE_H
+#define VIXL_ASSEMBLER_BASE_H
+
+#include "code-buffer-vixl.h"
+
+namespace vixl {
+
+class CodeBufferCheckScope;
+
+namespace internal {
+
+class AssemblerBase {
+ public:
+  AssemblerBase() : allow_assembler_(false) {}
+  explicit AssemblerBase(size_t capacity)
+      : buffer_(capacity), allow_assembler_(false) {}
+  AssemblerBase(byte* buffer, size_t capacity)
+      : buffer_(buffer, capacity), allow_assembler_(false) {}
+
+  virtual ~AssemblerBase() {}
+
+  // Finalize a code buffer of generated instructions. This function must be
+  // called before executing or copying code from the buffer.
+  void FinalizeCode() { GetBuffer()->SetClean(); }
+
+  ptrdiff_t GetCursorOffset() const { return GetBuffer().GetCursorOffset(); }
+
+  // Return the address of the cursor.
+  template <typename T>
+  T GetCursorAddress() const {
+    VIXL_STATIC_ASSERT(sizeof(T) >= sizeof(uintptr_t));
+    return GetBuffer().GetOffsetAddress<T>(GetCursorOffset());
+  }
+
+  size_t GetSizeOfCodeGenerated() const { return GetCursorOffset(); }
+
+  // Accessors.
+  CodeBuffer* GetBuffer() { return &buffer_; }
+  const CodeBuffer& GetBuffer() const { return buffer_; }
+  bool AllowAssembler() const { return allow_assembler_; }
+
+ protected:
+  void SetAllowAssembler(bool allow) { allow_assembler_ = allow; }
+
+  // CodeBufferCheckScope must be able to temporarily allow the assembler.
+  friend class vixl::CodeBufferCheckScope;
+
+  // Buffer where the code is emitted.
+  CodeBuffer buffer_;
+
+ private:
+  bool allow_assembler_;
+
+ public:
+  // Deprecated public interface.
+
+  // Return the address of an offset in the buffer.
+  template <typename T>
+  VIXL_DEPRECATED("GetBuffer().GetOffsetAddress<T>(offset)",
+                  T GetOffsetAddress(ptrdiff_t offset) const) {
+    return GetBuffer().GetOffsetAddress<T>(offset);
+  }
+
+  // Return the address of the start of the buffer.
+  template <typename T>
+  VIXL_DEPRECATED("GetBuffer().GetStartAddress<T>()",
+                  T GetStartAddress() const) {
+    return GetBuffer().GetOffsetAddress<T>(0);
+  }
+};
+
+}  // namespace internal
+}  // namespace vixl
+
+#endif  // VIXL_ASSEMBLER_BASE_H