[v8-dev] ARM: safepoints frame optimization

src/v8globals.h

 // Copyright 2012 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
@@ skipping 201 matching lines @@
   VISIT_ALL,
   VISIT_ALL_IN_SCAVENGE,
   VISIT_ALL_IN_SWEEP_NEWSPACE,
   VISIT_ONLY_STRONG
 };
 
 // Flag indicating whether code is built into the VM (one of the natives files).
 enum NativesFlag { NOT_NATIVES_CODE, NATIVES_CODE };
 
 
+#if V8_TARGET_ARCH_A64
+typedef uint64_t RegList;
+#else
+typedef uint32_t RegList;
+#endif
+const RegList kRegListEmpty = 0;
+const int kRegListSize = sizeof(RegList);       // NOLINT
+
+
 // A CodeDesc describes a buffer holding instructions and relocation
 // information. The instructions start at the beginning of the buffer
 // and grow forward, the relocation information starts at the end of
 // the buffer and grows backward.
 //
 //  |<--------------- buffer_size ---------------->|
 //  |<-- instr_size -->|        |<-- reloc_size -->|
 //  +==================+========+==================+
 //  |   instructions   |  free  |    reloc info    |
 //  +==================+========+==================+
 //  ^
 //  |
 //  buffer
 
 struct CodeDesc {
   byte* buffer;
   int buffer_size;
   int instr_size;
   int reloc_size;
   Assembler* origin;
+  RegList registers_mask;
+  RegList double_registers_mask;
 };
 
 
 // Callback function used for iterating objects in heap spaces,
 // for example, scanning heap objects.
 typedef int (*HeapObjectCallback)(HeapObject* obj);
 
 
 // Callback function used for checking constraints when copying/relocating
 // objects. Returns true if an object can be copied/relocated from its
@@ skipping 306 matching lines @@
 
 
 enum MinusZeroMode {
   TREAT_MINUS_ZERO_AS_ZERO,
   FAIL_ON_MINUS_ZERO
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8GLOBALS_H_