X64: JSEntry Stub

src/x64/macro-assembler-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
@@ skipping 24 matching lines @@
 namespace internal {
 
 MacroAssembler::MacroAssembler(void* buffer, int size)
   : Assembler(buffer, size),
     unresolved_(0),
     generating_stub_(false),
     allow_stub_calls_(true),
     code_object_(Heap::undefined_value()) {
 }
 
+
 void MacroAssembler::TailCallRuntime(ExternalReference const& a, int b) {
   UNIMPLEMENTED();
 }
 
 
 void MacroAssembler::Set(Register dst, int64_t x) {
   if (is_int32(x)) {
     movq(dst, Immediate(x));
   } else if (is_uint32(x)) {
     movl(dst, Immediate(x));
   } else {
     movq(dst, x, RelocInfo::NONE);
   }
 }
 
 
 void MacroAssembler::Set(const Operand& dst, int64_t x) {
   if (is_int32(x)) {
     movq(kScratchRegister, Immediate(x));
   } else if (is_uint32(x)) {
     movl(kScratchRegister, Immediate(x));
   } else {
     movq(kScratchRegister, x, RelocInfo::NONE);
   }
   movq(dst, kScratchRegister);
 }
 
 
+void MacroAssembler::PushTryHandler(CodeLocation try_location,
+                                    HandlerType type) {
+  // The pc (return address) is already on TOS.
+  // This code pushes state, code, frame pointer and parameter pointer.
+  // Check that they are expected next on the stack, int that order.
+  ASSERT_EQ(StackHandlerConstants::kStateOffset,
+            StackHandlerConstants::kPCOffset - kPointerSize);
+  ASSERT_EQ(StackHandlerConstants::kCodeOffset,
+            StackHandlerConstants::kStateOffset - kPointerSize);
+  ASSERT_EQ(StackHandlerConstants::kFPOffset,
+            StackHandlerConstants::kCodeOffset - kPointerSize);
+  ASSERT_EQ(StackHandlerConstants::kPPOffset,
+            StackHandlerConstants::kFPOffset - kPointerSize);
+
+  if (try_location == IN_JAVASCRIPT) {
+    if (type == TRY_CATCH_HANDLER) {
+      push(Immediate(StackHandler::TRY_CATCH));
+    } else {
+      push(Immediate(StackHandler::TRY_FINALLY));
+    }
+    push(Immediate(Smi::FromInt(StackHandler::kCodeNotPresent)));
+    push(rbp);
+    push(rdi);
+  } else {
+    ASSERT(try_location == IN_JS_ENTRY);
+    // The parameter pointer is meaningless here and ebp does not
+    // point to a JS frame. So we save NULL for both pp and ebp. We
+    // expect the code throwing an exception to check ebp before
+    // dereferencing it to restore the context.
+    push(Immediate(StackHandler::ENTRY));
+    push(Immediate(Smi::FromInt(StackHandler::kCodeNotPresent)));
+    push(Immediate(0));  // NULL frame pointer
+    push(Immediate(0));  // NULL parameter pointer
+  }
+  movq(kScratchRegister, ExternalReference(Top::k_handler_address));
+  // Cached TOS.
+  movq(rax, Operand(kScratchRegister, 0));
+  // Link this handler.
+  movq(Operand(kScratchRegister, 0), rsp);
+}
+
+
 } }  // namespace v8::internal