[Interpreter] Add support for JS calls.

src/compiler/x64/instruction-selector-x64.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.
 
 #include <algorithm>
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
@@ skipping 1183 matching lines @@
     // Emit the call instruction.
     size_t output_count = buffer.outputs.size();
     auto* outputs = &buffer.outputs.front();
     Emit(opcode, output_count, outputs, buffer.instruction_args.size(),
          &buffer.instruction_args.front())->MarkAsCall();
     Emit(kArchRet, 0, nullptr, output_count, outputs);
   }
 }
 
 
+void InstructionSelector::VisitCallVarArgs(Node* node) {
+  X64OperandGenerator g(this);
+  const CallDescriptor* descriptor = OpParameter<const CallDescriptor*>(node);
+  const int descriptor_input_count = static_cast<int>(descriptor->InputCount());
+
+  FrameStateDescriptor* frame_state_descriptor = nullptr;
+  if (descriptor->NeedsFrameState()) {
+    frame_state_descriptor =
+        GetFrameStateDescriptor(node->InputAt(descriptor_input_count + 2));
+  }
+
+  CallBuffer buffer(zone(), descriptor, frame_state_descriptor);
+
+  // Compute InstructionOperands for inputs and outputs.
+  InitializeCallBuffer(node, &buffer, true, true);
+
+  // Push the arguments onto the stack.
+  Node* args_start = node->InputAt(descriptor_input_count);
+  Node* args_end = node->InputAt(descriptor_input_count + 1);
+  Emit(kX64PushMultiple, g.NoOutput(), g.UseRegister(args_start),

[Benedikt Meurer, 2015/09/07 05:14:30]

Mhm, I have mixed feelings with this, but on the other hand I cannot think of a
better solution.

+       g.UseRegister(args_end));
+
+  // Select the appropriate opcode based on the call type.
+  CallDescriptor::Flags flags = descriptor->flags();
+  InstructionCode opcode;
+  switch (descriptor->kind()) {
+    case CallDescriptor::kCallCodeObject:
+      opcode = kArchCallCodeObject | MiscField::encode(flags);
+      break;
+    case CallDescriptor::kCallJSFunction:
+      opcode = kArchCallJSFunction | MiscField::encode(flags);
+      break;
+    default:
+      UNREACHABLE();
+      return;
+  }
+
+  // Emit the call instruction.
+  size_t const output_count = buffer.outputs.size();
+  auto* outputs = output_count ? &buffer.outputs.front() : nullptr;
+  Emit(opcode, output_count, outputs, buffer.instruction_args.size(),
+       &buffer.instruction_args.front())->MarkAsCall();
+}
+
+
 namespace {
 
 // Shared routine for multiple compare operations.
 void VisitCompare(InstructionSelector* selector, InstructionCode opcode,
                   InstructionOperand left, InstructionOperand right,
                   FlagsContinuation* cont) {
   X64OperandGenerator g(selector);
   opcode = cont->Encode(opcode);
   if (cont->IsBranch()) {
     selector->Emit(opcode, g.NoOutput(), left, right,
@@ skipping 470 matching lines @@
   if (CpuFeatures::IsSupported(SSE4_1)) {
     flags |= MachineOperatorBuilder::kFloat64RoundDown |
              MachineOperatorBuilder::kFloat64RoundTruncate;
   }
   return flags;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8