X87: Preserve argument count for calls.

src/x87/builtins-x87.cc

Index: src/x87/builtins-x87.cc
diff --git a/src/x87/builtins-x87.cc b/src/x87/builtins-x87.cc
index 11448e6fbad84060cb6d6c9f69525c169da4cb77..e4fe9f70804c6e0aa099f9017fdfd8d5e6146af5 100644
--- a/src/x87/builtins-x87.cc
+++ b/src/x87/builtins-x87.cc
@@ -60,39 +60,43 @@ void Builtins::Generate_Adaptor(MacroAssembler* masm,
   __ JumpToExternalReference(ExternalReference(id, masm->isolate()));
 }
 
-
-static void CallRuntimePassFunction(
-    MacroAssembler* masm, Runtime::FunctionId function_id) {
+static void GenerateTailCallToReturnedCode(MacroAssembler* masm,
+                                           Runtime::FunctionId function_id) {
   // ----------- S t a t e -------------
+  //  -- eax : argument count (preserved for callee)
   //  -- edx : new target (preserved for callee)
   //  -- edi : target function (preserved for callee)
   // -----------------------------------
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
+    // Push the number of arguments to the callee.
+    __ SmiTag(eax);
+    __ push(eax);
+    // Push a copy of the target function and the new target.
+    __ push(edi);
+    __ push(edx);
+    // Function is also the parameter to the runtime call.
+    __ push(edi);
 
-  FrameScope scope(masm, StackFrame::INTERNAL);
-  // Push a copy of the target function and the new target.
-  __ push(edi);
-  __ push(edx);
-  // Function is also the parameter to the runtime call.
-  __ push(edi);
-
-  __ CallRuntime(function_id, 1);
-  // Restore target function and new target.
-  __ pop(edx);
-  __ pop(edi);
-}
+    __ CallRuntime(function_id, 1);
+    __ mov(ebx, eax);
 
+    // Restore target function and new target.
+    __ pop(edx);
+    __ pop(edi);
+    __ pop(eax);
+    __ SmiUntag(eax);
+  }
 
-static void GenerateTailCallToSharedCode(MacroAssembler* masm) {
-  __ mov(eax, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
-  __ mov(eax, FieldOperand(eax, SharedFunctionInfo::kCodeOffset));
-  __ lea(eax, FieldOperand(eax, Code::kHeaderSize));
-  __ jmp(eax);
+  __ lea(ebx, FieldOperand(ebx, Code::kHeaderSize));
+  __ jmp(ebx);
 }
 
-
-static void GenerateTailCallToReturnedCode(MacroAssembler* masm) {
-  __ lea(eax, FieldOperand(eax, Code::kHeaderSize));
-  __ jmp(eax);
+static void GenerateTailCallToSharedCode(MacroAssembler* masm) {
+  __ mov(ebx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
+  __ mov(ebx, FieldOperand(ebx, SharedFunctionInfo::kCodeOffset));
+  __ lea(ebx, FieldOperand(ebx, Code::kHeaderSize));
+  __ jmp(ebx);
 }
 
 
@@ -108,14 +112,12 @@ void Builtins::Generate_InOptimizationQueue(MacroAssembler* masm) {
   __ cmp(esp, Operand::StaticVariable(stack_limit));
   __ j(above_equal, &ok, Label::kNear);
 
-  CallRuntimePassFunction(masm, Runtime::kTryInstallOptimizedCode);
-  GenerateTailCallToReturnedCode(masm);
+  GenerateTailCallToReturnedCode(masm, Runtime::kTryInstallOptimizedCode);
 
   __ bind(&ok);
   GenerateTailCallToSharedCode(masm);
 }
 
-
 static void Generate_JSConstructStubHelper(MacroAssembler* masm,
                                            bool is_api_function,
                                            bool create_implicit_receiver,
@@ -852,20 +854,18 @@ void Builtins::Generate_InterpreterEnterBytecodeDispatch(MacroAssembler* masm) {
 
 
 void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
-  CallRuntimePassFunction(masm, Runtime::kCompileLazy);
-  GenerateTailCallToReturnedCode(masm);
+  GenerateTailCallToReturnedCode(masm, Runtime::kCompileLazy);
 }
 
 
 void Builtins::Generate_CompileOptimized(MacroAssembler* masm) {
-  CallRuntimePassFunction(masm, Runtime::kCompileOptimized_NotConcurrent);
-  GenerateTailCallToReturnedCode(masm);
+  GenerateTailCallToReturnedCode(masm,
+                                 Runtime::kCompileOptimized_NotConcurrent);
 }
 
 
 void Builtins::Generate_CompileOptimizedConcurrent(MacroAssembler* masm) {
-  CallRuntimePassFunction(masm, Runtime::kCompileOptimized_Concurrent);
-  GenerateTailCallToReturnedCode(masm);
+  GenerateTailCallToReturnedCode(masm, Runtime::kCompileOptimized_Concurrent);
 }