[wasm] WasmRunner can run tests with I64 parameters and return value.

src/compiler/int64-lowering.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 "src/compiler/int64-lowering.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
+#include "src/compiler/linkage.h"
 #include "src/compiler/machine-operator.h"
+#include "src/compiler/node-properties.h"
+
 #include "src/compiler/node.h"
+#include "src/wasm/wasm-module.h"
 #include "src/zone.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 Int64Lowering::Int64Lowering(Graph* graph, MachineOperatorBuilder* machine,
-                             CommonOperatorBuilder* common, Zone* zone)
-    : graph_(graph),
+                             CommonOperatorBuilder* common, Zone* zone,
+                             Signature<MachineRepresentation>* signature)
+    : zone_(zone),
+      graph_(graph),
       machine_(machine),
       common_(common),
       state_(graph, 4),
       stack_(zone),
-      replacements_(zone->NewArray<Replacement>(graph->NodeCount())) {
+      replacements_(zone->NewArray<Replacement>(graph->NodeCount())),
+      signature_(signature) {
   memset(replacements_, 0, sizeof(Replacement) * graph->NodeCount());
 }
 
-void Int64Lowering::ReduceGraph() {
+void Int64Lowering::LowerGraph() {
+#if WASM_64

[titzer, 2016/02/18 12:06:22]

Why not just return?

[ahaas, 2016/02/18 13:00:18]

I replaced the UNREACHABLE by a DCHECK_EQ(4, kPointerSize). I want to see it if
I ever use the lowering accidentally.

+  UNREACHABLE();
+#endif
   stack_.push(graph()->end());
   state_.Set(graph()->end(), State::kOnStack);
 
   while (!stack_.empty()) {
     Node* top = stack_.top();
     if (state_.Get(top) == State::kInputsPushed) {
       stack_.pop();
       state_.Set(top, State::kVisited);
       // All inputs of top have already been reduced, now reduce top.
-      ReduceNode(top);
+      LowerNode(top);
     } else {
       // Push all children onto the stack.
       for (Node* input : top->inputs()) {
         if (state_.Get(input) == State::kUnvisited) {
           stack_.push(input);
           state_.Set(input, State::kOnStack);
         }
       }
       state_.Set(top, State::kInputsPushed);
     }
   }
 }
 
-void Int64Lowering::ReduceNode(Node* node) {
+static int GetParameterIndexAfterLowering(
+    Signature<MachineRepresentation>* signature, int old_index) {
+  int result = old_index;
+  for (int i = 0; i < old_index; i++) {
+    if (signature->GetParam(i) == MachineRepresentation::kWord64) {
+      result++;
+    }
+  }
+  return result;
+}
+
+static int GetParameterCountAfterLowering(
+    Signature<MachineRepresentation>* signature) {
+  return GetParameterIndexAfterLowering(
+      signature, static_cast<int>(signature->parameter_count()));
+}
+
+static int GetReturnCountAfterLowering(
+    Signature<MachineRepresentation>* signature) {
+  int result = static_cast<int>(signature->return_count());
+  for (int i = 0; i < static_cast<int>(signature->return_count()); i++) {
+    if (signature->GetReturn(i) == MachineRepresentation::kWord64) {
+      result++;
+    }
+  }
+  return result;
+}
+
+void Int64Lowering::LowerNode(Node* node) {
   switch (node->opcode()) {
     case IrOpcode::kInt64Constant: {
       int64_t value = OpParameter<int64_t>(node);
       Node* low_node = graph()->NewNode(
           common()->Int32Constant(static_cast<int32_t>(value & 0xFFFFFFFF)));
       Node* high_node = graph()->NewNode(
           common()->Int32Constant(static_cast<int32_t>(value >> 32)));
-      replacements_[node->id()].low = low_node;
-      replacements_[node->id()].high = high_node;
+      ReplaceNode(node, low_node, high_node);
+      break;
+    }
+    case IrOpcode::kLoad: {
+      LoadRepresentation load_rep = LoadRepresentationOf(node->op());
+
+      if (load_rep.representation() == MachineRepresentation::kWord64) {
+        Node* base = node->InputAt(0);
+        Node* index = node->InputAt(1);
+        Node* index_high =
+            graph()->NewNode(machine()->Int32Add(), index,
+                             graph()->NewNode(common()->Int32Constant(4)));
+
+        const Operator* load_op = machine()->Load(MachineType::Int32());
+        Node* high_node;
+        if (node->InputCount() > 2) {
+          Node* effect_high = node->InputAt(2);
+          Node* control_high = node->InputAt(3);
+          high_node = graph()->NewNode(load_op, base, index_high, effect_high,
+                                       control_high);
+          // change the effect change from old_node --> old_effect to
+          // old_node --> high_node --> old_effect.
+          node->ReplaceInput(2, high_node);
+        } else {
+          high_node = graph()->NewNode(load_op, base, index_high);
+        }
+        NodeProperties::ChangeOp(node, load_op);
+        ReplaceNode(node, node, high_node);
+      }
+      break;
+    }
+    case IrOpcode::kStore: {
+      StoreRepresentation store_rep = StoreRepresentationOf(node->op());
+      if (store_rep.representation() == MachineRepresentation::kWord64) {
+        // We change the original store node to store the low word, and create
+        // a new store node to store the high word. The effect and control edges
+        // are copied from the original store to the new store node, the effect
+        // edge of the original store is redirected to the new store.
+        WriteBarrierKind write_barrier_kind = store_rep.write_barrier_kind();
+
+        Node* base = node->InputAt(0);
+        Node* index = node->InputAt(1);
+        Node* index_high =
+            graph()->NewNode(machine()->Int32Add(), index,
+                             graph()->NewNode(common()->Int32Constant(4)));
+
+        Node* value = node->InputAt(2);
+        DCHECK(HasReplacementLow(value));
+        DCHECK(HasReplacementHigh(value));
+
+        const Operator* store_op = machine()->Store(StoreRepresentation(
+            MachineRepresentation::kWord32, write_barrier_kind));
+
+        Node* high_node;
+        if (node->InputCount() > 3) {
+          Node* effect_high = node->InputAt(3);
+          Node* control_high = node->InputAt(4);
+          high_node = graph()->NewNode(store_op, base, index_high,
+                                       GetReplacementHigh(value), effect_high,
+                                       control_high);
+          node->ReplaceInput(3, high_node);
+
+        } else {
+          high_node = graph()->NewNode(store_op, base, index_high,
+                                       GetReplacementHigh(value));
+        }
+
+        node->ReplaceInput(2, GetReplacementLow(value));
+        NodeProperties::ChangeOp(node, store_op);
+        ReplaceNode(node, node, high_node);
+      }
       break;
     }
     case IrOpcode::kWord64And: {
+      DCHECK(node->InputCount() == 2);
       Node* left = node->InputAt(0);
-      DCHECK(replacements_[left->id()].low);
-      Node* left_low = replacements_[left->id()].low;
-      Node* left_high = replacements_[left->id()].high;
-
       Node* right = node->InputAt(1);
-      DCHECK(replacements_[right->id()].low);
-      Node* right_low = replacements_[right->id()].low;
-      Node* right_high = replacements_[right->id()].high;
-
-      replacements_[node->id()].low =
-          graph()->NewNode(machine()->Word32And(), left_low, right_low);
-      replacements_[node->id()].high =
-          graph()->NewNode(machine()->Word32And(), left_high, right_high);
+
+      Node* low_node =
+          graph()->NewNode(machine()->Word32And(), GetReplacementLow(left),
+                           GetReplacementLow(right));
+      Node* high_node =
+          graph()->NewNode(machine()->Word32And(), GetReplacementHigh(left),
+                           GetReplacementHigh(right));
+      ReplaceNode(node, low_node, high_node);
       break;
     }
     case IrOpcode::kTruncateInt64ToInt32: {
+      DCHECK(node->InputCount() == 1);
       Node* input = node->InputAt(0);
-      DCHECK(replacements_[input->id()].low);
-      replacements_[node->id()].low = replacements_[input->id()].low;
-      break;
-    }
-    default: {
-      // Also the inputs of nodes can change which do not expect int64 inputs.
-      for (int i = 0; i < node->InputCount(); i++) {
-        Node* input = node->InputAt(i);
-        // The input has changed altough it was not an int64 input. This can
-        // happen e.g. if the input node is IrOpcode::kTruncateInt64ToInt32. We
-        // use the low word replacement as the new input.
-        if (replacements_[input->id()].low) {
-          node->ReplaceInput(i, replacements_[input->id()].low);
+      ReplaceNode(node, GetReplacementLow(input), nullptr);
+      node->NullAllInputs();
+      break;
+    }
+    case IrOpcode::kStart: {
+      int parameter_count = GetParameterCountAfterLowering(signature());
+      // Only exchange the node if the parameter count actually changed.
+      if (parameter_count != signature()->parameter_count()) {
+        int delta =
+            parameter_count - static_cast<int>(signature()->parameter_count());
+        int new_output_count = node->op()->ValueOutputCount() + delta;
+        NodeProperties::ChangeOp(node, common()->Start(new_output_count));
+      }
+      break;
+    }
+    case IrOpcode::kParameter: {
+      DCHECK(node->InputCount() == 1);
+      // Only exchange the node if the parameter count actually changed. We do
+      // not even have to do the default lowering because the the start node,
+      // the only input of a parameter node, only changes if the parameter count
+      // changes.
+      if (GetParameterCountAfterLowering(signature()) !=
+          signature()->parameter_count()) {
+        int old_index = ParameterIndexOf(node->op());
+        int new_index = GetParameterIndexAfterLowering(signature(), old_index);
+        Node* low_node =
+            graph()->NewNode(common()->Parameter(new_index), graph()->start());
+
+        Node* high_node = nullptr;
+        if (signature()->GetParam(old_index) ==
+            MachineRepresentation::kWord64) {
+          high_node = graph()->NewNode(common()->Parameter(new_index + 1),
+                                       graph()->start());
         }
-      }
-    }
+        ReplaceNode(node, low_node, high_node);
+      }
+      break;
+    }
+    case IrOpcode::kReturn: {
+      DefaultLowering(node);
+      int new_return_count = GetReturnCountAfterLowering(signature());
+      if (signature()->return_count() != new_return_count) {
+        NodeProperties::ChangeOp(node, common()->Return(new_return_count));
+      }
+      break;
+    }
+    case IrOpcode::kCall: {
+      CallDescriptor* descriptor = OpParameter<CallDescriptor*>(node);
+      if (DefaultLowering(node) ||
+          (descriptor->ReturnCount() == 1 &&
+           descriptor->GetReturnType(0) == MachineType::Int64())) {
+        // We have to adjust the call descriptor.
+        const Operator* op = common()->Call(
+            wasm::ModuleEnv::GetI32WasmCallDescriptor(zone(), descriptor));
+        NodeProperties::ChangeOp(node, op);
+      }
+      if (descriptor->ReturnCount() == 1 &&
+          descriptor->GetReturnType(0) == MachineType::Int64()) {
+        // We access the additional return values through projections.
+        Node* low_node = graph()->NewNode(common()->Projection(0), node);
+        Node* high_node = graph()->NewNode(common()->Projection(1), node);
+        ReplaceNode(node, low_node, high_node);
+      }
+      break;
+    }
+    default: { DefaultLowering(node); }
   }
 }
 
+bool Int64Lowering::DefaultLowering(Node* node) {
+  bool something_changed = false;
+  for (int i = NodeProperties::PastValueIndex(node) - 1; i >= 0; i--) {
+    Node* input = node->InputAt(i);
+    if (HasReplacementLow(input)) {
+      something_changed = true;
+      node->ReplaceInput(i, GetReplacementLow(input));
+    }
+    if (HasReplacementHigh(input)) {
+      something_changed = true;
+      node->InsertInput(zone(), i + 1, GetReplacementHigh(input));
+    }
+  }
+  return something_changed;
+}
+
+void Int64Lowering::ReplaceNode(Node* old, Node* new_low, Node* new_high) {
+  // if new_low == nullptr, then also new_high == nullptr.
+  DCHECK(new_low != nullptr || new_high == nullptr);
+  replacements_[old->id()].low = new_low;
+  replacements_[old->id()].high = new_high;
+}
+
+bool Int64Lowering::HasReplacementLow(Node* node) {
+  return replacements_[node->id()].low != nullptr;
+}
+
+Node* Int64Lowering::GetReplacementLow(Node* node) {
+  Node* result = replacements_[node->id()].low;
+  DCHECK(result);
+  return result;
+}
+
+bool Int64Lowering::HasReplacementHigh(Node* node) {
+  return replacements_[node->id()].high != nullptr;
+}
+
+Node* Int64Lowering::GetReplacementHigh(Node* node) {
+  Node* result = replacements_[node->id()].high;
+  DCHECK(result);
+  return result;
+}
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8