PPC: Preserve argument count for calls.

src/ppc/builtins-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 451 matching lines @@
     FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
     __ Push(r5, r4, r6);  // first argument, constructor, new target
     __ CallRuntime(Runtime::kNewObject);
     __ Pop(r5);
   }
   __ StoreP(r5, FieldMemOperand(r3, JSValue::kValueOffset), r0);
   __ Ret();
 }
 
 
-static void CallRuntimePassFunction(MacroAssembler* masm,
-                                    Runtime::FunctionId function_id) {
-  // ----------- S t a t e -------------
-  //  -- r4 : target function (preserved for callee)
-  //  -- r6 : new target (preserved for callee)
-  // -----------------------------------
-
-  FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
-  // Push a copy of the target function and the new target.
-  // Push function as parameter to the runtime call.
-  __ Push(r4, r6, r4);
-
-  __ CallRuntime(function_id, 1);
-  // Restore target function and new target.
-  __ Pop(r4, r6);
-}
-
-
 static void GenerateTailCallToSharedCode(MacroAssembler* masm) {
   __ LoadP(ip, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
   __ LoadP(ip, FieldMemOperand(ip, SharedFunctionInfo::kCodeOffset));
   __ addi(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
   __ JumpToJSEntry(ip);
 }
 
+static void GenerateTailCallToReturnedCode(MacroAssembler* masm,
+                                           Runtime::FunctionId function_id) {
+  // ----------- S t a t e -------------
+  //  -- r3 : argument count (preserved for callee)
+  //  -- r4 : target function (preserved for callee)
+  //  -- r6 : new target (preserved for callee)
+  // -----------------------------------
+  {
+    FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
+    // Push the number of arguments to the callee.
+    // Push a copy of the target function and the new target.
+    // Push function as parameter to the runtime call.
+    __ SmiTag(r3);
+    __ Push(r3, r4, r6, r4);
 
-static void GenerateTailCallToReturnedCode(MacroAssembler* masm) {
-  __ addi(ip, r3, Operand(Code::kHeaderSize - kHeapObjectTag));
+    __ CallRuntime(function_id, 1);
+    __ mr(r5, r3);
+
+    // Restore target function and new target.
+    __ Pop(r3, r4, r6);
+    __ SmiUntag(r3);
+  }
+  __ addi(ip, r5, Operand(Code::kHeaderSize - kHeapObjectTag));
   __ JumpToJSEntry(ip);
 }
 
 
 void Builtins::Generate_InOptimizationQueue(MacroAssembler* masm) {
   // Checking whether the queued function is ready for install is optional,
   // since we come across interrupts and stack checks elsewhere.  However,
   // not checking may delay installing ready functions, and always checking
   // would be quite expensive.  A good compromise is to first check against
   // stack limit as a cue for an interrupt signal.
   Label ok;
   __ LoadRoot(ip, Heap::kStackLimitRootIndex);
   __ cmpl(sp, ip);
   __ bge(&ok);
 
-  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,
                                            bool check_derived_construct) {
@@ skipping 698 matching lines @@
   // uses this address to determine whether a frame is interpreted.
   __ mov(r0,
          Operand(masm->isolate()->builtins()->InterpreterEntryTrampoline()));
   __ mtlr(r0);
 
   Generate_EnterBytecodeDispatch(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);
 }
 
 
 static void GenerateMakeCodeYoungAgainCommon(MacroAssembler* masm) {
   // For now, we are relying on the fact that make_code_young doesn't do any
   // garbage collection which allows us to save/restore the registers without
   // worrying about which of them contain pointers. We also don't build an
   // internal frame to make the code faster, since we shouldn't have to do stack
   // crawls in MakeCodeYoung. This seems a bit fragile.
 
@@ skipping 1494 matching lines @@
     __ bkpt(0);
   }
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC