X64: JSEntry Stub

src/x64/macro-assembler-x64.h

 // Copyright 2006-2008 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 15 matching lines @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef V8_X64_MACRO_ASSEMBLER_X64_H_
 #define V8_X64_MACRO_ASSEMBLER_X64_H_
 
 #include "assembler.h"
 
 namespace v8 {
 namespace internal {
 
+// Default scratch register used by MacroAssembler (and other code that needs
+// a spare register). The register isn't callee save, and not used by the
+// function calling convention.
 static const Register kScratchRegister = r10;
 
 // Forward declaration.
 class JumpTarget;
 
 
 // Helper types to make flags easier to read at call sites.
 enum InvokeFlag {
   CALL_FUNCTION,
   JUMP_FUNCTION
@@ skipping 105 matching lines @@
 
   // FCmp is similar to integer cmp, but requires unsigned
   // jcc instructions (je, ja, jae, jb, jbe, je, and jz).
   void FCmp();
 
   // ---------------------------------------------------------------------------
   // Exception handling
 
   // Push a new try handler and link into try handler chain.
   // The return address must be pushed before calling this helper.
-  // On exit, eax contains TOS (next_sp).
+  // On exit, rax contains TOS (next_sp).
   void PushTryHandler(CodeLocation try_location, HandlerType type);
 
 
   // ---------------------------------------------------------------------------
   // Inline caching support
 
   // Generates code that verifies that the maps of objects in the
   // prototype chain of object hasn't changed since the code was
   // generated and branches to the miss label if any map has. If
   // necessary the function also generates code for security check
@@ skipping 193 matching lines @@
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_