[wasm] Initial signal handler

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index 502af6a37656be1f0d732e0c14b315c362e8264b..b36e41a08f1c3632fa486580ba2a367e55018904 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -269,13 +269,12 @@ class OutOfLineRecordWrite final : public OutOfLineCode {
 class WasmOutOfLineTrap final : public OutOfLineCode {
  public:
   WasmOutOfLineTrap(CodeGenerator* gen, int pc, bool frame_elided,
-                    int32_t position, Instruction* instr)
+                    int32_t position)
       : OutOfLineCode(gen),
         gen_(gen),
         pc_(pc),
         frame_elided_(frame_elided),
-        position_(position),
-        instr_(instr) {}
+        position_(position) {}
 
   // TODO(eholk): Refactor this method to take the code generator as a
   // parameter.
@@ -295,10 +294,10 @@ class WasmOutOfLineTrap final : public OutOfLineCode {
     __ Move(rsi, gen_->isolate()->native_context());
     __ CallRuntime(Runtime::kThrowWasmError);
 
-    if (instr_->reference_map() != nullptr) {
-      gen_->RecordSafepoint(instr_->reference_map(), Safepoint::kSimple, 0,
-                            Safepoint::kNoLazyDeopt);
-    }
+    ReferenceMap* reference_map =
+        new (gen_->code()->zone()) ReferenceMap(gen_->code()->zone());
+    gen_->RecordSafepoint(reference_map, Safepoint::kSimple, 0,
+                          Safepoint::kNoLazyDeopt);
   }
 
  private:
@@ -306,18 +305,17 @@ class WasmOutOfLineTrap final : public OutOfLineCode {
   int pc_;
   bool frame_elided_;
   int32_t position_;
-  Instruction* instr_;
 };
 
 void EmitOOLTrapIfNeeded(Zone* zone, CodeGenerator* codegen,
                          InstructionCode opcode, size_t input_count,
-                         X64OperandConverter& i, int pc, Instruction* instr) {
+                         X64OperandConverter& i, int pc) {
   const X64MemoryProtection protection =
       static_cast<X64MemoryProtection>(MiscField::decode(opcode));
   if (protection == X64MemoryProtection::kProtected) {
     const bool frame_elided = !codegen->frame_access_state()->has_frame();
     const int32_t position = i.InputInt32(input_count - 1);
-    new (zone) WasmOutOfLineTrap(codegen, pc, frame_elided, position, instr);
+    new (zone) WasmOutOfLineTrap(codegen, pc, frame_elided, position);
   }
 }
 }  // namespace
@@ -1857,30 +1855,30 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       break;
     case kX64Movsxbl:
       EmitOOLTrapIfNeeded(zone(), this, opcode, instr->InputCount(), i,
-                          __ pc_offset(), instr);
+                          __ pc_offset());
       ASSEMBLE_MOVX(movsxbl);
       __ AssertZeroExtended(i.OutputRegister());
       break;
     case kX64Movzxbl:
       EmitOOLTrapIfNeeded(zone(), this, opcode, instr->InputCount(), i,
-                          __ pc_offset(), instr);
+                          __ pc_offset());
       ASSEMBLE_MOVX(movzxbl);
       __ AssertZeroExtended(i.OutputRegister());
       break;
     case kX64Movsxbq:
       EmitOOLTrapIfNeeded(zone(), this, opcode, instr->InputCount(), i,
-                          __ pc_offset(), instr);
+                          __ pc_offset());
       ASSEMBLE_MOVX(movsxbq);
       break;
     case kX64Movzxbq:
       EmitOOLTrapIfNeeded(zone(), this, opcode, instr->InputCount(), i,
-                          __ pc_offset(), instr);
+                          __ pc_offset());
       ASSEMBLE_MOVX(movzxbq);
       __ AssertZeroExtended(i.OutputRegister());
       break;
     case kX64Movb: {
       EmitOOLTrapIfNeeded(zone(), this, opcode, instr->InputCount(), i,
-                          __ pc_offset(), instr);
+                          __ pc_offset());
       size_t index = 0;
       Operand operand = i.MemoryOperand(&index);
       if (HasImmediateInput(instr, index)) {
@@ -1892,30 +1890,30 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     }
     case kX64Movsxwl:
       EmitOOLTrapIfNeeded(zone(), this, opcode, instr->InputCount(), i,
-                          __ pc_offset(), instr);
+                          __ pc_offset());
       ASSEMBLE_MOVX(movsxwl);
       __ AssertZeroExtended(i.OutputRegister());
       break;
     case kX64Movzxwl:
       EmitOOLTrapIfNeeded(zone(), this, opcode, instr->InputCount(), i,
-                          __ pc_offset(), instr);
+                          __ pc_offset());
       ASSEMBLE_MOVX(movzxwl);
       __ AssertZeroExtended(i.OutputRegister());
       break;
     case kX64Movsxwq:
       EmitOOLTrapIfNeeded(zone(), this, opcode, instr->InputCount(), i,
-                          __ pc_offset(), instr);
+                          __ pc_offset());
       ASSEMBLE_MOVX(movsxwq);
       break;
     case kX64Movzxwq:
       EmitOOLTrapIfNeeded(zone(), this, opcode, instr->InputCount(), i,
-                          __ pc_offset(), instr);
+                          __ pc_offset());
       ASSEMBLE_MOVX(movzxwq);
       __ AssertZeroExtended(i.OutputRegister());
       break;
     case kX64Movw: {
       EmitOOLTrapIfNeeded(zone(), this, opcode, instr->InputCount(), i,
-                          __ pc_offset(), instr);
+                          __ pc_offset());
       size_t index = 0;
       Operand operand = i.MemoryOperand(&index);
       if (HasImmediateInput(instr, index)) {
@@ -1927,7 +1925,7 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     }
     case kX64Movl:
       EmitOOLTrapIfNeeded(zone(), this, opcode, instr->InputCount(), i,
-                          __ pc_offset(), instr);
+                          __ pc_offset());
       if (instr->HasOutput()) {
         if (instr->addressing_mode() == kMode_None) {
           if (instr->InputAt(0)->IsRegister()) {
@@ -1951,12 +1949,12 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       break;
     case kX64Movsxlq:
       EmitOOLTrapIfNeeded(zone(), this, opcode, instr->InputCount(), i,
-                          __ pc_offset(), instr);
+                          __ pc_offset());
       ASSEMBLE_MOVX(movsxlq);
       break;
     case kX64Movq:
       EmitOOLTrapIfNeeded(zone(), this, opcode, instr->InputCount(), i,
-                          __ pc_offset(), instr);
+                          __ pc_offset());
       if (instr->HasOutput()) {
         __ movq(i.OutputRegister(), i.MemoryOperand());
       } else {
@@ -1971,7 +1969,7 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       break;
     case kX64Movss:
       EmitOOLTrapIfNeeded(zone(), this, opcode, instr->InputCount(), i,
-                          __ pc_offset(), instr);
+                          __ pc_offset());
       if (instr->HasOutput()) {
         __ movss(i.OutputDoubleRegister(), i.MemoryOperand());
       } else {
@@ -1982,7 +1980,7 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       break;
     case kX64Movsd:
       EmitOOLTrapIfNeeded(zone(), this, opcode, instr->InputCount(), i,
-                          __ pc_offset(), instr);
+                          __ pc_offset());
       if (instr->HasOutput()) {
         __ Movsd(i.OutputDoubleRegister(), i.MemoryOperand());
       } else {