CallICStub with a "never patch" approach until customization.

src/arm/code-stubs-arm.cc

 // Copyright 2012 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.
 
 #include "v8.h"
 
 #if V8_TARGET_ARCH_ARM
 
 #include "bootstrapper.h"
 #include "code-stubs.h"
@@ skipping 2838 matching lines @@
 
   __ Push(r4, r2, r1);
   __ RecordWrite(r2, r4, r1, kLRHasNotBeenSaved, kDontSaveFPRegs,
                  EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
   __ Pop(r4, r2, r1);
 
   __ bind(&done);
 }
 
 
+static void EmitContinueIfStrictOrNative(MacroAssembler* masm, Label* cont) {
+  // Do not transform the receiver for strict mode functions.
+  __ ldr(r3, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
+  __ ldr(r4, FieldMemOperand(r3, SharedFunctionInfo::kCompilerHintsOffset));
+  __ tst(r4, Operand(1 << (SharedFunctionInfo::kStrictModeFunction +
+                           kSmiTagSize)));
+  __ b(ne, cont);
+
+  // Do not transform the receiver for native (Compilerhints already in r3).
+  __ tst(r4, Operand(1 << (SharedFunctionInfo::kNative + kSmiTagSize)));
+  __ b(ne, cont);
+}
+
+
+static void EmitSlowCase(MacroAssembler* masm,
+                         int argc,
+                         Label* non_function) {
+  // Check for function proxy.
+  __ cmp(r4, Operand(JS_FUNCTION_PROXY_TYPE));
+  __ b(ne, non_function);
+  __ push(r1);  // put proxy as additional argument
+  __ mov(r0, Operand(argc + 1, RelocInfo::NONE32));
+  __ mov(r2, Operand::Zero());
+  __ GetBuiltinFunction(r1, Builtins::CALL_FUNCTION_PROXY);
+  {
+    Handle<Code> adaptor =
+        masm->isolate()->builtins()->ArgumentsAdaptorTrampoline();
+    __ Jump(adaptor, RelocInfo::CODE_TARGET);
+  }
+
+  // CALL_NON_FUNCTION expects the non-function callee as receiver (instead
+  // of the original receiver from the call site).
+  __ bind(non_function);
+  __ str(r1, MemOperand(sp, argc * kPointerSize));
+  __ mov(r0, Operand(argc));  // Set up the number of arguments.
+  __ mov(r2, Operand::Zero());
+  __ GetBuiltinFunction(r1, Builtins::CALL_NON_FUNCTION);
+  __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
+          RelocInfo::CODE_TARGET);
+}
+
+
+static void EmitWrapCase(MacroAssembler* masm, int argc, Label* cont) {
+  // Wrap the receiver and patch it back onto the stack.
+  { FrameAndConstantPoolScope frame_scope(masm, StackFrame::INTERNAL);
+    __ Push(r1, r3);
+    __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+    __ pop(r1);
+  }
+  __ str(r0, MemOperand(sp, argc * kPointerSize));
+  __ jmp(cont);
+}
+
+
 void CallFunctionStub::Generate(MacroAssembler* masm) {
   // r1 : the function to call
-  // r2 : feedback vector
-  // r3 : (only if r2 is not the megamorphic symbol) slot in feedback
-  //      vector (Smi)
   Label slow, non_function, wrap, cont;
 
   if (NeedsChecks()) {
     // Check that the function is really a JavaScript function.
     // r1: pushed function (to be verified)
     __ JumpIfSmi(r1, &non_function);
 
     // Goto slow case if we do not have a function.
     __ CompareObjectType(r1, r4, r4, JS_FUNCTION_TYPE);
     __ b(ne, &slow);
-
-    if (RecordCallTarget()) {
-      GenerateRecordCallTarget(masm);
-      // Type information was updated. Because we may call Array, which
-      // expects either undefined or an AllocationSite in ebx we need
-      // to set ebx to undefined.
-      __ LoadRoot(r2, Heap::kUndefinedValueRootIndex);
-    }
   }
 
   // Fast-case: Invoke the function now.
   // r1: pushed function
-  ParameterCount actual(argc_);
+  int argc = argc_;
+  ParameterCount actual(argc);
 
   if (CallAsMethod()) {
     if (NeedsChecks()) {
-      // Do not transform the receiver for strict mode functions.
-      __ ldr(r3, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
-      __ ldr(r4, FieldMemOperand(r3, SharedFunctionInfo::kCompilerHintsOffset));
-      __ tst(r4, Operand(1 << (SharedFunctionInfo::kStrictModeFunction +
-                               kSmiTagSize)));
-      __ b(ne, &cont);
-
-      // Do not transform the receiver for native (Compilerhints already in r3).
-      __ tst(r4, Operand(1 << (SharedFunctionInfo::kNative + kSmiTagSize)));
-      __ b(ne, &cont);
+      EmitContinueIfStrictOrNative(masm, &cont);
     }
 
     // Compute the receiver in sloppy mode.
-    __ ldr(r3, MemOperand(sp, argc_ * kPointerSize));
+    __ ldr(r3, MemOperand(sp, argc * kPointerSize));
 
     if (NeedsChecks()) {
       __ JumpIfSmi(r3, &wrap);
       __ CompareObjectType(r3, r4, r4, FIRST_SPEC_OBJECT_TYPE);
       __ b(lt, &wrap);
     } else {
       __ jmp(&wrap);
     }
 
     __ bind(&cont);
   }
+
   __ InvokeFunction(r1, actual, JUMP_FUNCTION, NullCallWrapper());
 
   if (NeedsChecks()) {
     // Slow-case: Non-function called.
     __ bind(&slow);
-    if (RecordCallTarget()) {
-      // If there is a call target cache, mark it megamorphic in the
-      // non-function case.  MegamorphicSentinel is an immortal immovable
-      // object (megamorphic symbol) so no write barrier is needed.
-      ASSERT_EQ(*TypeFeedbackInfo::MegamorphicSentinel(isolate()),
-                isolate()->heap()->megamorphic_symbol());
-      __ add(r5, r2, Operand::PointerOffsetFromSmiKey(r3));
-      __ LoadRoot(ip, Heap::kMegamorphicSymbolRootIndex);
-      __ str(ip, FieldMemOperand(r5, FixedArray::kHeaderSize));
-    }
-    // Check for function proxy.
-    __ cmp(r4, Operand(JS_FUNCTION_PROXY_TYPE));
-    __ b(ne, &non_function);
-    __ push(r1);  // put proxy as additional argument
-    __ mov(r0, Operand(argc_ + 1, RelocInfo::NONE32));
-    __ mov(r2, Operand::Zero());
-    __ GetBuiltinFunction(r1, Builtins::CALL_FUNCTION_PROXY);
-    {
-      Handle<Code> adaptor =
-        isolate()->builtins()->ArgumentsAdaptorTrampoline();
-      __ Jump(adaptor, RelocInfo::CODE_TARGET);
-    }
-
-    // CALL_NON_FUNCTION expects the non-function callee as receiver (instead
-    // of the original receiver from the call site).
-    __ bind(&non_function);
-    __ str(r1, MemOperand(sp, argc_ * kPointerSize));
-    __ mov(r0, Operand(argc_));  // Set up the number of arguments.
-    __ mov(r2, Operand::Zero());
-    __ GetBuiltinFunction(r1, Builtins::CALL_NON_FUNCTION);
-    __ Jump(isolate()->builtins()->ArgumentsAdaptorTrampoline(),
-            RelocInfo::CODE_TARGET);
+    EmitSlowCase(masm, argc, &non_function);
   }
 
   if (CallAsMethod()) {
     __ bind(&wrap);
-    // Wrap the receiver and patch it back onto the stack.
-    { FrameAndConstantPoolScope frame_scope(masm, StackFrame::INTERNAL);
-      __ Push(r1, r3);
-      __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
-      __ pop(r1);
-    }
-    __ str(r0, MemOperand(sp, argc_ * kPointerSize));
-    __ jmp(&cont);
+    EmitWrapCase(masm, argc, &cont);
   }
 }
 
 
 void CallConstructStub::Generate(MacroAssembler* masm) {
   // r0 : number of arguments
   // r1 : the function to call
   // r2 : feedback vector
   // r3 : (only if r2 is not the megamorphic symbol) slot in feedback
   //      vector (Smi)
@@ skipping 48 matching lines @@
   __ bind(&non_function_call);
   __ GetBuiltinFunction(r1, Builtins::CALL_NON_FUNCTION_AS_CONSTRUCTOR);
   __ bind(&do_call);
   // Set expected number of arguments to zero (not changing r0).
   __ mov(r2, Operand::Zero());
   __ Jump(isolate()->builtins()->ArgumentsAdaptorTrampoline(),
           RelocInfo::CODE_TARGET);
 }
 
 
+static void EmitLoadTypeFeedbackVector(MacroAssembler* masm, Register vector) {
+  __ ldr(vector, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+  __ ldr(vector, FieldMemOperand(vector,
+                                 JSFunction::kSharedFunctionInfoOffset));
+  __ ldr(vector, FieldMemOperand(vector,
+                                 SharedFunctionInfo::kFeedbackVectorOffset));
+}
+
+
+void CallICStub::Generate(MacroAssembler* masm) {
+  // r1 - function
+  // r3 - slot id (Smi)
+  Label extra_checks_or_miss, slow_start;
+  Label slow, non_function, wrap, cont;
+  Label have_js_function;
+  int argc = state_.arg_count();
+  ParameterCount actual(argc);
+
+  EmitLoadTypeFeedbackVector(masm, r2);
+
+  // The checks. First, does r1 match the recorded monomorphic target?
+  __ add(r4, r2, Operand::PointerOffsetFromSmiKey(r3));
+  __ ldr(r4, FieldMemOperand(r4, FixedArray::kHeaderSize));
+  __ cmp(r1, r4);
+  __ b(ne, &extra_checks_or_miss);
+
+  __ bind(&have_js_function);
+  if (state_.CallAsMethod()) {
+    EmitContinueIfStrictOrNative(masm, &cont);
+    // Compute the receiver in sloppy mode.
+    __ ldr(r3, MemOperand(sp, argc * kPointerSize));
+
+    __ JumpIfSmi(r3, &wrap);
+    __ CompareObjectType(r3, r4, r4, FIRST_SPEC_OBJECT_TYPE);
+    __ b(lt, &wrap);
+
+    __ bind(&cont);
+  }
+
+  __ InvokeFunction(r1, actual, JUMP_FUNCTION, NullCallWrapper());
+
+  __ bind(&slow);
+  EmitSlowCase(masm, argc, &non_function);
+
+  if (state_.CallAsMethod()) {
+    __ bind(&wrap);
+    EmitWrapCase(masm, argc, &cont);
+  }
+
+  __ bind(&extra_checks_or_miss);
+  Label miss;
+
+  __ CompareRoot(r4, Heap::kMegamorphicSymbolRootIndex);
+  __ b(eq, &slow_start);
+  __ CompareRoot(r4, Heap::kUninitializedSymbolRootIndex);
+  __ b(eq, &miss);
+
+  if (!FLAG_trace_ic) {
+    // We are going megamorphic, and we don't want to visit the runtime.
+    __ add(r4, r2, Operand::PointerOffsetFromSmiKey(r3));
+    __ LoadRoot(ip, Heap::kMegamorphicSymbolRootIndex);
+    __ str(ip, FieldMemOperand(r4, FixedArray::kHeaderSize));
+    __ jmp(&slow_start);
+  }
+
+  // We are here because tracing is on or we are going monomorphic.
+  __ bind(&miss);
+  GenerateMiss(masm);
+
+  // the slow case
+  __ bind(&slow_start);
+  // Check that the function is really a JavaScript function.
+  // r1: pushed function (to be verified)
+  __ JumpIfSmi(r1, &non_function);
+
+  // Goto slow case if we do not have a function.
+  __ CompareObjectType(r1, r4, r4, JS_FUNCTION_TYPE);
+  __ b(ne, &slow);
+  __ jmp(&have_js_function);
+}
+
+
+void CallICStub::GenerateMiss(MacroAssembler* masm) {
+  // Get the receiver of the function from the stack; 1 ~ return address.
+  __ ldr(r4, MemOperand(sp, (state_.arg_count() + 1) * kPointerSize));
+
+  {
+    FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
+
+    // Push the receiver and the function and feedback info.
+    __ Push(r4, r1, r2, r3);
+
+    // Call the entry.
+    ExternalReference miss = ExternalReference(IC_Utility(IC::kCallIC_Miss),
+                                               masm->isolate());
+    __ CallExternalReference(miss, 4);
+
+    // Move result to edi and exit the internal frame.
+    __ mov(r1, r0);
+  }
+}
+
+
 // StringCharCodeAtGenerator
 void StringCharCodeAtGenerator::GenerateFast(MacroAssembler* masm) {
   Label flat_string;
   Label ascii_string;
   Label got_char_code;
   Label sliced_string;
 
   // If the receiver is a smi trigger the non-string case.
   __ JumpIfSmi(object_, receiver_not_string_);
 
@@ skipping 2081 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM