dep: Add vixl (AArch32/64 assembler)

dep/vixl/include/vixl/macro-assembler-interface.h

@@ -0,0 +1,75 @@
+// 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_MACRO_ASSEMBLER_INTERFACE_H
+#define VIXL_MACRO_ASSEMBLER_INTERFACE_H
+
+#include "assembler-base-vixl.h"
+
+namespace vixl {
+
+class MacroAssemblerInterface {
+ public:
+  virtual internal::AssemblerBase* AsAssemblerBase() = 0;
+
+  virtual ~MacroAssemblerInterface() {}
+
+  virtual bool AllowMacroInstructions() const = 0;
+  virtual bool ArePoolsBlocked() const = 0;
+
+ protected:
+  virtual void SetAllowMacroInstructions(bool allow) = 0;
+
+  virtual void BlockPools() = 0;
+  virtual void ReleasePools() = 0;
+  virtual void EnsureEmitPoolsFor(size_t size) = 0;
+
+  // Emit the branch over a literal/veneer pool, and any necessary padding
+  // before it.
+  virtual void EmitPoolHeader() = 0;
+  // When this is called, the label used for branching over the pool is bound.
+  // This can also generate additional padding, which must correspond to the
+  // alignment_ value passed to the PoolManager (which needs to keep track of
+  // the exact size of the generated pool).
+  virtual void EmitPoolFooter() = 0;
+
+  // Emit n bytes of padding that does not have to be executable.
+  virtual void EmitPaddingBytes(int n) = 0;
+  // Emit n bytes of padding that has to be executable. Implementations must
+  // make sure this is a multiple of the instruction size.
+  virtual void EmitNopBytes(int n) = 0;
+
+  // The following scopes need access to the above method in order to implement
+  // pool blocking and temporarily disable the macro-assembler.
+  friend class ExactAssemblyScope;
+  friend class EmissionCheckScope;
+  template <typename T>
+  friend class PoolManager;
+};
+
+}  // namespace vixl
+
+#endif  // VIXL_MACRO_ASSEMBLER_INTERFACE_H