[wasm] Trap handling: ProtectedLoad instruction

src/compiler/x64/instruction-selector-x64.cc

Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index 04c4df307fba45730a88ced167b1af0f122494a8..368f4b492121092e3138587d4a57fddd5be6280d 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -155,11 +155,8 @@ class X64OperandGenerator final : public OperandGenerator {
   }
 };
 
-
-void InstructionSelector::VisitLoad(Node* node) {
-  LoadRepresentation load_rep = LoadRepresentationOf(node->op());
-  X64OperandGenerator g(this);
-
+namespace {
+ArchOpcode GetLoadOpcode(LoadRepresentation load_rep) {
   ArchOpcode opcode = kArchNop;
   switch (load_rep.representation()) {
     case MachineRepresentation::kFloat32:
@@ -187,9 +184,17 @@ void InstructionSelector::VisitLoad(Node* node) {
     case MachineRepresentation::kSimd128:  // Fall through.
     case MachineRepresentation::kNone:
       UNREACHABLE();
-      return;
+      break;
   }
+  return opcode;
+}
+}  // namespace
 
+void InstructionSelector::VisitLoad(Node* node) {
+  LoadRepresentation load_rep = LoadRepresentationOf(node->op());
+  X64OperandGenerator g(this);
+
+  ArchOpcode opcode = GetLoadOpcode(load_rep);
   InstructionOperand outputs[1];
   outputs[0] = g.DefineAsRegister(node);
   InstructionOperand inputs[3];
@@ -200,6 +205,24 @@ void InstructionSelector::VisitLoad(Node* node) {
   Emit(code, 1, outputs, input_count, inputs);
 }
 
+void InstructionSelector::VisitProtectedLoad(Node* node) {
+  LoadRepresentation load_rep = LoadRepresentationOf(node->op());
+  X64OperandGenerator g(this);
+
+  ArchOpcode opcode = GetLoadOpcode(load_rep);
+  InstructionOperand outputs[1];
+  outputs[0] = g.DefineAsRegister(node);
+  InstructionOperand inputs[4];
+  size_t input_count = 0;
+  AddressingMode mode =
+      g.GetEffectiveAddressMemoryOperand(node, inputs, &input_count);
+  // Add the context parameter as an input.
+  inputs[input_count++] = g.UseUniqueRegister(node->InputAt(2));
+  // Add the source position as an input
+  inputs[input_count++] = g.UseImmediate(node->InputAt(3));
+  InstructionCode code = opcode | AddressingModeField::encode(mode);
+  Emit(code, 1, outputs, input_count, inputs);
+}
 
 void InstructionSelector::VisitStore(Node* node) {
   X64OperandGenerator g(this);