PPC: [debug] implement intuitive semantics for stepping over await call.

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 705 matching lines @@
                       kLRHasNotBeenSaved, kDontSaveFPRegs);
 
   // Store resume mode into generator object.
   __ StoreP(r5, FieldMemOperand(r4, JSGeneratorObject::kResumeModeOffset), r0);
 
   // Load suspended function and context.
   __ LoadP(cp, FieldMemOperand(r4, JSGeneratorObject::kContextOffset));
   __ LoadP(r7, FieldMemOperand(r4, JSGeneratorObject::kFunctionOffset));
 
   // Flood function if we are stepping.
-  Label skip_flooding;
+  Label prepare_step_in_if_stepping, prepare_step_in_suspended_generator;
+  Label stepping_prepared;
   ExternalReference step_in_enabled =
       ExternalReference::debug_step_in_enabled_address(masm->isolate());
   __ mov(ip, Operand(step_in_enabled));
   __ lbz(ip, MemOperand(ip));
   __ cmpi(ip, Operand::Zero());
-  __ beq(&skip_flooding);
-  {
-    FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
-    __ Push(r4, r5, r7);
-    __ CallRuntime(Runtime::kDebugPrepareStepInIfStepping);
-    __ Pop(r4, r5);
-    __ LoadP(r7, FieldMemOperand(r4, JSGeneratorObject::kFunctionOffset));
-  }
-  __ bind(&skip_flooding);
+  __ bne(&prepare_step_in_if_stepping);
+
+  // Flood function if we need to continue stepping in the suspended generator.
+
+  ExternalReference debug_suspended_generator =
+      ExternalReference::debug_suspended_generator_address(masm->isolate());
+
+  __ mov(ip, Operand(debug_suspended_generator));
+  __ LoadP(ip, MemOperand(ip));
+  __ cmp(ip, r4);
+  __ beq(&prepare_step_in_suspended_generator);
+  __ bind(&stepping_prepared);
 
   // Push receiver.
   __ LoadP(ip, FieldMemOperand(r4, JSGeneratorObject::kReceiverOffset));
   __ Push(ip);
 
   // ----------- S t a t e -------------
   //  -- r4    : the JSGeneratorObject to resume
   //  -- r5    : the resume mode (tagged)
   //  -- r7    : generator function
   //  -- cp    : generator context
@@ skipping 85 matching lines @@
       __ SmiUntag(r5);
       __ add(r6, r6, r5);
       __ LoadSmiLiteral(r5,
                         Smi::FromInt(JSGeneratorObject::kGeneratorExecuting));
       __ StoreP(r5, FieldMemOperand(r4, JSGeneratorObject::kContinuationOffset),
                 r0);
       __ mr(r3, r4);  // Continuation expects generator object in r3.
       __ Jump(r6);
     }
   }
+
+  __ bind(&prepare_step_in_if_stepping);
+  {
+    FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
+    __ Push(r4, r5, r7);
+    __ CallRuntime(Runtime::kDebugPrepareStepInIfStepping);
+    __ Pop(r4, r5);
+    __ LoadP(r7, FieldMemOperand(r4, JSGeneratorObject::kFunctionOffset));
+  }
+  __ b(&stepping_prepared);
+
+  __ bind(&prepare_step_in_suspended_generator);
+  {
+    FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
+    __ Push(r4, r5);
+    __ CallRuntime(Runtime::kDebugPrepareStepInSuspendedGenerator);
+    __ Pop(r4, r5);
+    __ LoadP(r7, FieldMemOperand(r4, JSGeneratorObject::kFunctionOffset));
+  }
+  __ b(&stepping_prepared);
 }
 
 void Builtins::Generate_ConstructedNonConstructable(MacroAssembler* masm) {
   FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
   __ push(r4);
   __ CallRuntime(Runtime::kThrowConstructedNonConstructable);
 }
 
 
 enum IsTagged { kArgcIsSmiTagged, kArgcIsUntaggedInt };
@@ skipping 2002 matching lines @@
     __ bkpt(0);
   }
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC