X64: JSEntry Stub

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index 968b459b2b8f06fa05f9a9b0aa24734b8ba78b39..54c299dbfae9894ff96cec5b59fbf835d3a99c57 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -42,6 +42,7 @@ MacroAssembler::MacroAssembler(void* buffer, int size)
     code_object_(Heap::undefined_value()) {
 }
 
+
 void MacroAssembler::TailCallRuntime(ExternalReference const& a, int b) {
   UNIMPLEMENTED();
 }
@@ -70,4 +71,46 @@ void MacroAssembler::Set(const Operand& dst, int64_t x) {
 }
 
 
+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