Land the Fan (disabled)

src/compiler/linkage-impl.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_IMPL_H_
+#define V8_COMPILER_LINKAGE_IMPL_H_
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+class LinkageHelper {
+ public:
+  static LinkageLocation TaggedStackSlot(int index) {
+    ASSERT(index < 0);
+    return LinkageLocation(kMachineTagged, index);
+  }
+
+  static LinkageLocation TaggedRegisterLocation(Register reg) {
+    return LinkageLocation(kMachineTagged, Register::ToAllocationIndex(reg));
+  }
+
+  static inline LinkageLocation WordRegisterLocation(Register reg) {
+    return LinkageLocation(MachineOperatorBuilder::pointer_rep(),
+                           Register::ToAllocationIndex(reg));
+  }
+
+  static LinkageLocation UnconstrainedRegister(MachineRepresentation rep) {
+    return LinkageLocation(rep, LinkageLocation::ANY_REGISTER);
+  }
+
+  static const RegList kNoCalleeSaved = 0;
+
+  // TODO(turbofan): cache call descriptors for JSFunction calls.
+  template <typename LinkageTraits>
+  static CallDescriptor* GetJSCallDescriptor(Zone* zone, int parameter_count) {
+    const int jsfunction_count = 1;
+    const int context_count = 1;
+    int input_count = jsfunction_count + parameter_count + context_count;
+
+    const int return_count = 1;
+    LinkageLocation* locations =
+        zone->NewArray<LinkageLocation>(return_count + input_count);
+
+    int index = 0;
+    locations[index++] =
+        TaggedRegisterLocation(LinkageTraits::ReturnValueReg());
+    locations[index++] =
+        TaggedRegisterLocation(LinkageTraits::JSCallFunctionReg());
+
+    for (int i = 0; i < parameter_count; i++) {
+      // All parameters to JS calls go on the stack.
+      int spill_slot_index = i - parameter_count;
+      locations[index++] = TaggedStackSlot(spill_slot_index);
+    }
+    locations[index++] = TaggedRegisterLocation(LinkageTraits::ContextReg());
+
+    // TODO(titzer): refactor TurboFan graph to consider context a value input.
+    return new (zone)
+        CallDescriptor(CallDescriptor::kCallJSFunction,  // kind
+                       return_count,                     // return_count
+                       parameter_count,                  // parameter_count
+                       input_count - context_count,      // input_count
+                       locations,                        // locations
+                       Operator::kNoProperties,          // properties
+                       kNoCalleeSaved,  // callee-saved registers
+                       CallDescriptor::kCanDeoptimize);  // deoptimization
+  }
+
+
+  // TODO(turbofan): cache call descriptors for runtime calls.
+  template <typename LinkageTraits>
+  static CallDescriptor* GetRuntimeCallDescriptor(
+      Zone* zone, Runtime::FunctionId function_id, int parameter_count,
+      Operator::Property properties,
+      CallDescriptor::DeoptimizationSupport can_deoptimize) {
+    const int code_count = 1;
+    const int function_count = 1;
+    const int num_args_count = 1;
+    const int context_count = 1;
+    const int input_count = code_count + parameter_count + function_count +
+                            num_args_count + context_count;
+
+    const Runtime::Function* function = Runtime::FunctionForId(function_id);
+    const int return_count = function->result_size;
+    LinkageLocation* locations =
+        zone->NewArray<LinkageLocation>(return_count + input_count);
+
+    int index = 0;
+    if (return_count > 0) {
+      locations[index++] =
+          TaggedRegisterLocation(LinkageTraits::ReturnValueReg());
+    }
+    if (return_count > 1) {
+      locations[index++] =
+          TaggedRegisterLocation(LinkageTraits::ReturnValue2Reg());
+    }
+
+    ASSERT_LE(return_count, 2);
+
+    locations[index++] = UnconstrainedRegister(kMachineTagged);  // CEntryStub
+
+    for (int i = 0; i < parameter_count; i++) {
+      // All parameters to runtime calls go on the stack.
+      int spill_slot_index = i - parameter_count;
+      locations[index++] = TaggedStackSlot(spill_slot_index);
+    }
+    locations[index++] =
+        TaggedRegisterLocation(LinkageTraits::RuntimeCallFunctionReg());
+    locations[index++] =
+        WordRegisterLocation(LinkageTraits::RuntimeCallArgCountReg());
+    locations[index++] = TaggedRegisterLocation(LinkageTraits::ContextReg());
+
+    // TODO(titzer): refactor TurboFan graph to consider context a value input.
+    return new (zone) CallDescriptor(CallDescriptor::kCallCodeObject,  // kind
+                                     return_count,     // return_count
+                                     parameter_count,  // parameter_count
+                                     input_count,      // input_count
+                                     locations,        // locations
+                                     properties,       // properties
+                                     kNoCalleeSaved,   // callee-saved registers
+                                     can_deoptimize,   // deoptimization
+                                     function->name);
+  }
+
+
+  // TODO(turbofan): cache call descriptors for code stub calls.
+  template <typename LinkageTraits>
+  static CallDescriptor* GetStubCallDescriptor(
+      Zone* zone, CodeStubInterfaceDescriptor* descriptor,
+      int stack_parameter_count) {
+    int register_parameter_count = descriptor->GetEnvironmentParameterCount();
+    int parameter_count = register_parameter_count + stack_parameter_count;
+    const int code_count = 1;
+    const int context_count = 1;
+    int input_count = code_count + parameter_count + context_count;
+
+    const int return_count = 1;
+    LinkageLocation* locations =
+        zone->NewArray<LinkageLocation>(return_count + input_count);
+
+    int index = 0;
+    locations[index++] =
+        TaggedRegisterLocation(LinkageTraits::ReturnValueReg());
+    locations[index++] = UnconstrainedRegister(kMachineTagged);  // code
+    for (int i = 0; i < parameter_count; i++) {
+      if (i < register_parameter_count) {
+        // The first parameters to code stub calls go in registers.
+        Register reg = descriptor->GetEnvironmentParameterRegister(i);
+        locations[index++] = TaggedRegisterLocation(reg);
+      } else {
+        // The rest of the parameters go on the stack.
+        int stack_slot = i - register_parameter_count - stack_parameter_count;
+        locations[index++] = TaggedStackSlot(stack_slot);
+      }
+    }
+    locations[index++] = TaggedRegisterLocation(LinkageTraits::ContextReg());
+
+    // TODO(titzer): refactor TurboFan graph to consider context a value input.
+    return new (zone)
+        CallDescriptor(CallDescriptor::kCallCodeObject,  // kind
+                       return_count,                     // return_count
+                       parameter_count,                  // parameter_count
+                       input_count,                      // input_count
+                       locations,                        // locations
+                       Operator::kNoProperties,          // properties
+                       kNoCalleeSaved,  // callee-saved registers
+                       CallDescriptor::kCannotDeoptimize,  // deoptimization
+                       CodeStub::MajorName(descriptor->MajorKey(), false));
+    // TODO(jarin) should deoptimize!
+  }
+
+
+  template <typename LinkageTraits>
+  static CallDescriptor* GetSimplifiedCDescriptor(
+      Zone* zone, int num_params, MachineRepresentation return_type,
+      const MachineRepresentation* param_types) {
+    LinkageLocation* locations =
+        zone->NewArray<LinkageLocation>(num_params + 2);
+    int index = 0;
+    locations[index++] =
+        TaggedRegisterLocation(LinkageTraits::ReturnValueReg());
+    locations[index++] = LinkageHelper::UnconstrainedRegister(
+        MachineOperatorBuilder::pointer_rep());
+    // TODO(dcarney): test with lots of parameters.
+    int i = 0;
+    for (; i < LinkageTraits::CRegisterParametersLength() && i < num_params;
+         i++) {
+      locations[index++] = LinkageLocation(
+          param_types[i],
+          Register::ToAllocationIndex(LinkageTraits::CRegisterParameter(i)));
+    }
+    for (; i < num_params; i++) {
+      locations[index++] = LinkageLocation(param_types[i], -1 - i);
+    }
+    return new (zone) CallDescriptor(
+        CallDescriptor::kCallAddress, 1, num_params, num_params + 1, locations,
+        Operator::kNoProperties, LinkageTraits::CCalleeSaveRegisters(),
+        CallDescriptor::kCannotDeoptimize);  // TODO(jarin) should deoptimize!
+  }
+};
+}
+}
+}  // namespace v8::internal::compiler
+
+#endif  // V8_COMPILER_LINKAGE_IMPL_H_