Change the register allocator so that it no longer tracks references...

src/arm/register-allocator-arm-inl.h

+// 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.
+
+#ifndef V8_ARM_REGISTER_ALLOCATOR_ARM_INL_H_
+#define V8_ARM_REGISTER_ALLOCATOR_ARM_INL_H_
+
+#include "v8.h"
+
+namespace v8 {
+namespace internal {
+
+// -------------------------------------------------------------------------
+// RegisterAllocator implementation.
+
+bool RegisterAllocator::IsReserved(Register reg) {
+  return reg.is(cp) || reg.is(fp) || reg.is(sp) || reg.is(pc);
+}
+
+
+
+// The register allocator uses small integers to represent the
+// non-reserved assembler registers.  The mapping is:
+//
+// r0 <-> 0
+// r1 <-> 1
+// r2 <-> 2
+// r3 <-> 3
+// r4 <-> 4
+// r5 <-> 5
+// r6 <-> 6
+// r7 <-> 7
+// r9 <-> 8
+// r10 <-> 9
+// ip <-> 10
+// lr <-> 11
+
+int RegisterAllocator::ToNumber(Register reg) {
+  ASSERT(reg.is_valid() && !IsReserved(reg));
+  static int numbers[] = {
+    0,   // r0
+    1,   // r1
+    2,   // r2
+    3,   // r3
+    4,   // r4
+    5,   // r5
+    6,   // r6
+    7,   // r7
+    -1,  // cp
+    8,   // r9
+    9,   // r10
+    -1,  // fp
+    10,  // ip
+    -1,  // sp
+    11,  // lr
+    -1   // pc
+  };
+  return numbers[reg.code()];
+}
+
+
+Register RegisterAllocator::ToRegister(int num) {
+  ASSERT(num >= 0 && num < kNumRegisters);
+  static Register registers[] =
+      { r0, r1, r2, r3, r4, r5, r6, r7, r9, r10, ip, lr };
+  return registers[num];
+}
+
+
+void RegisterAllocator::Initialize() {
+  Reset();
+  // The non-reserved r1 and lr registers are live on JS function entry.
+  Use(r1);  // JS function.
+  Use(lr);  // Return address.
+}
+
+
+} }  // namespace v8::internal
+
+#endif  // V8_ARM_REGISTER_ALLOCATOR_ARM_INL_H_