X64 platform: Add more register allocator functions.

src/x64/register-allocator-x64.cc

 // Copyright 2009 the V8 project 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 Google Inc. 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 AND 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.
 
+#include "v8.h"
+
+#include "codegen-inl.h"
+#include "register-allocator-inl.h"
+
+namespace v8 {
+namespace internal {
+
+// -------------------------------------------------------------------------
+// Result implementation.
+
+void Result::ToRegister() {
+  ASSERT(is_valid());
+  if (is_constant()) {
+    // TODO(X64): Handle constant results.
+    /*
+    Result fresh = CodeGeneratorScope::Current()->allocator()->Allocate();
+    ASSERT(fresh.is_valid());
+    if (CodeGeneratorScope::Current()->IsUnsafeSmi(handle())) {
+      CodeGeneratorScope::Current()->LoadUnsafeSmi(fresh.reg(), handle());
+    } else {
+      CodeGeneratorScope::Current()->masm()->Set(fresh.reg(),
+                                                 Immediate(handle()));
+    }
+    // This result becomes a copy of the fresh one.
+    *this = fresh;
+    */
+  }
+  ASSERT(is_register());
+}
+
+
+void Result::ToRegister(Register target) {
+  ASSERT(is_valid());
+  if (!is_register() || !reg().is(target)) {
+    Result fresh = CodeGeneratorScope::Current()->allocator()->Allocate(target);
+    ASSERT(fresh.is_valid());
+    if (is_register()) {
+      CodeGeneratorScope::Current()->masm()->movq(fresh.reg(), reg());
+    } else {
+      ASSERT(is_constant());
+      /*
+      TODO(X64): Handle constant results.
+      if (CodeGeneratorScope::Current()->IsUnsafeSmi(handle())) {
+        CodeGeneratorScope::Current()->LoadUnsafeSmi(fresh.reg(), handle());
+      } else {
+        CodeGeneratorScope::Current()->masm()->Set(fresh.reg(),
+                                                   Immediate(handle()));
+      }
+      */
+    }
+    *this = fresh;
+  } else if (is_register() && reg().is(target)) {
+    ASSERT(CodeGeneratorScope::Current()->has_valid_frame());
+    CodeGeneratorScope::Current()->frame()->Spill(target);
+    ASSERT(CodeGeneratorScope::Current()->allocator()->count(target) == 1);
+  }
+  ASSERT(is_register());
+  ASSERT(reg().is(target));
+}
+
+
+} }  // namespace v8::internal