[turbofan] Add basic support for calling to (a subset of) C functions.

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 1020 matching lines @@
   if (descriptor->NeedsFrameState()) {
     frame_state_descriptor = GetFrameStateDescriptor(
         node->InputAt(static_cast<int>(descriptor->InputCount())));
   }
 
   CallBuffer buffer(zone(), descriptor, frame_state_descriptor);
 
   // Compute InstructionOperands for inputs and outputs.
   InitializeCallBuffer(node, &buffer, true, true);
 
-  // Push any stack arguments.
-  for (Node* node : base::Reversed(buffer.pushed_nodes)) {
-    // TODO(titzer): handle pushing double parameters.
-    InstructionOperand value =
-        g.CanBeImmediate(node)
-            ? g.UseImmediate(node)
-            : IsSupported(ATOM) ? g.UseRegister(node) : g.Use(node);
-    Emit(kX64Push, g.NoOutput(), value);
+  // Prepare for C function call.
+  if (descriptor->IsCFunctionCall()) {
+    Emit(kArchPrepareCallCFunction |
+             MiscField::encode(static_cast<int>(descriptor->CParameterCount())),
+         0, nullptr, 0, nullptr);
+
+    // Poke any stack arguments.
+    int slot = 0;
+    for (Node* node : buffer.pushed_nodes) {
+      InstructionOperand value =
+          g.CanBeImmediate(node) ? g.UseImmediate(node) : g.UseRegister(node);
+      Emit(kX64Poke | MiscField::encode(slot), g.NoOutput(), value);
+      ++slot;
+    }
+  } else {
+    // Push any stack arguments.
+    for (Node* node : base::Reversed(buffer.pushed_nodes)) {
+      // TODO(titzer): handle pushing double parameters.
+      InstructionOperand value =
+          g.CanBeImmediate(node)
+              ? g.UseImmediate(node)
+              : IsSupported(ATOM) ? g.UseRegister(node) : g.Use(node);
+      Emit(kX64Push, g.NoOutput(), value);
+    }
   }
 
   // Pass label of exception handler block.
   CallDescriptor::Flags flags = descriptor->flags();
   if (handler) {
     DCHECK_EQ(IrOpcode::kIfException, handler->front()->opcode());
     IfExceptionHint hint = OpParameter<IfExceptionHint>(handler->front());
     if (hint == IfExceptionHint::kLocallyCaught) {
       flags |= CallDescriptor::kHasLocalCatchHandler;
     }
     flags |= CallDescriptor::kHasExceptionHandler;
     buffer.instruction_args.push_back(g.Label(handler));
   }
 
   // Select the appropriate opcode based on the call type.
   InstructionCode opcode;
   switch (descriptor->kind()) {
+    case CallDescriptor::kCallAddress:
+      opcode =
+          kArchCallCFunction |
+          MiscField::encode(static_cast<int>(descriptor->CParameterCount()));
+      break;
     case CallDescriptor::kCallCodeObject:
-      opcode = kArchCallCodeObject;
+      opcode = kArchCallCodeObject | MiscField::encode(flags);
       break;
     case CallDescriptor::kCallJSFunction:
-      opcode = kArchCallJSFunction;
+      opcode = kArchCallJSFunction | MiscField::encode(flags);
       break;
     default:
       UNREACHABLE();
       return;
   }
-  opcode |= MiscField::encode(flags);
 
   // 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();
 }
 
 
 void InstructionSelector::VisitTailCall(Node* node) {
@@ skipping 553 matching lines @@
   if (CpuFeatures::IsSupported(SSE4_1)) {
     flags |= MachineOperatorBuilder::kFloat64RoundDown |
              MachineOperatorBuilder::kFloat64RoundTruncate;
   }
   return flags;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8