Initial support for debugger frame state in Turbofan.

src/compiler/linkage.h

 // 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.
 
 #ifndef V8_COMPILER_LINKAGE_H_
 #define V8_COMPILER_LINKAGE_H_
 
 #include "src/v8.h"
 
 #include "src/code-stubs.h"
@@ skipping 25 matching lines @@
   int16_t location_;  // >= 0 implies register, otherwise stack slot.
 };
 
 
 class CallDescriptor : public ZoneObject {
  public:
   // Describes whether the first parameter is a code object, a JSFunction,
   // or an address--all of which require different machine sequences to call.
   enum Kind { kCallCodeObject, kCallJSFunction, kCallAddress };
 
-  enum DeoptimizationSupport { kCanDeoptimize, kCannotDeoptimize };
+  // TODO(jarin) kLazyDeoptimization and kNeedsFrameState should be unified.
+  enum DeoptimizationSupport {
+    kNoDeoptimization = 0,
+    kLazyDeoptimization = 1,
+    kNeedsFrameState = 2
+  };
 
   CallDescriptor(Kind kind, int8_t return_count, int16_t parameter_count,
                  int16_t input_count, LinkageLocation* locations,
                  Operator::Property properties, RegList callee_saved_registers,
                  DeoptimizationSupport deoptimization_support,
                  const char* debug_name = "")
       : kind_(kind),
         return_count_(return_count),
         parameter_count_(parameter_count),
         input_count_(input_count),
@@ skipping 10 matching lines @@
 
   // The number of return values from this call, usually 0 or 1.
   int ReturnCount() const { return return_count_; }
 
   // The number of JavaScript parameters to this call, including receiver,
   // but not the context.
   int ParameterCount() const { return parameter_count_; }
 
   int InputCount() const { return input_count_; }
 
+  int FrameStateCount() const { return NeedsFrameState() ? 1 : 0; }
+
   bool CanLazilyDeoptimize() const {
-    return deoptimization_support_ == kCanDeoptimize;
+    return (deoptimization_support() & kLazyDeoptimization) != 0;
+  }
+
+  bool NeedsFrameState() const {
+    return (deoptimization_support() & kNeedsFrameState) != 0;
+  }
+
+  DeoptimizationSupport deoptimization_support() const {
+    return deoptimization_support_;
   }
 
   LinkageLocation GetReturnLocation(int index) {
     DCHECK(index < return_count_);
     return locations_[0 + index];  // return locations start at 0.
   }
 
   LinkageLocation GetInputLocation(int index) {
     DCHECK(index < input_count_ + 1);  // input_count + 1 is the context.
     return locations_[return_count_ + index];  // inputs start after returns.
@@ skipping 45 matching lines @@
 
   // The call descriptor for this compilation unit describes the locations
   // of incoming parameters and the outgoing return value(s).
   CallDescriptor* GetIncomingDescriptor() { return incoming_; }
   CallDescriptor* GetJSCallDescriptor(int parameter_count);
   static CallDescriptor* GetJSCallDescriptor(int parameter_count, Zone* zone);
   CallDescriptor* GetRuntimeCallDescriptor(
       Runtime::FunctionId function, int parameter_count,
       Operator::Property properties,
       CallDescriptor::DeoptimizationSupport can_deoptimize =
-          CallDescriptor::kCannotDeoptimize);
+          CallDescriptor::kNoDeoptimization);
   static CallDescriptor* GetRuntimeCallDescriptor(
       Runtime::FunctionId function, int parameter_count,
       Operator::Property properties,
       CallDescriptor::DeoptimizationSupport can_deoptimize, Zone* zone);
 
   CallDescriptor* GetStubCallDescriptor(
       CodeStubInterfaceDescriptor* descriptor, int stack_parameter_count = 0,
       CallDescriptor::DeoptimizationSupport can_deoptimize =
-          CallDescriptor::kCannotDeoptimize);
+          CallDescriptor::kNoDeoptimization);
   static CallDescriptor* GetStubCallDescriptor(
       CodeStubInterfaceDescriptor* descriptor, int stack_parameter_count,
       CallDescriptor::DeoptimizationSupport can_deoptimize, Zone* zone);
 
   // Creates a call descriptor for simplified C calls that is appropriate
   // for the host platform. This simplified calling convention only supports
   // integers and pointers of one word size each, i.e. no floating point,
   // structs, pointers to members, etc.
   static CallDescriptor* GetSimplifiedCDescriptor(
       Zone* zone, int num_params, MachineType return_type,
@@ skipping 20 matching lines @@
 
  private:
   CompilationInfo* info_;
   CallDescriptor* incoming_;
 };
 }
 }
 }  // namespace v8::internal::compiler
 
 #endif  // V8_COMPILER_LINKAGE_H_