Port and integrate the irregexp engine from V8

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
diff --git a/runtime/vm/intermediate_language_mips.cc b/runtime/vm/intermediate_language_mips.cc
index 4a69d11f31833d546a8fcb0ff3ab3cc74aa30aac..c8b1723977adc4404e0c80a539e0f2c63b5aacfa 100644
--- a/runtime/vm/intermediate_language_mips.cc
+++ b/runtime/vm/intermediate_language_mips.cc
@@ -1260,6 +1260,91 @@ void LoadIndexedInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 }
 
 
+CompileType LoadCodeUnitsInstr::ComputeType() const {
+  switch (class_id()) {
+    case kOneByteStringCid:
+    case kTwoByteStringCid:
+      return CompileType::FromCid(kSmiCid);
+    default:
+      UNIMPLEMENTED();
+      return CompileType::Dynamic();
+  }
+}
+
+
+Representation LoadCodeUnitsInstr::representation() const {
+  switch (class_id()) {
+    case kOneByteStringCid:
+    case kTwoByteStringCid:
+      return kTagged;
+    default:
+      UNIMPLEMENTED();
+      return kTagged;
+  }
+}
+
+
+LocationSummary* LoadCodeUnitsInstr::MakeLocationSummary(Isolate* isolate,
+                                                         bool opt) const {
+  const intptr_t kNumInputs = 2;
+  const intptr_t kNumTemps = 0;
+  LocationSummary* locs = new(isolate) LocationSummary(
+      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  locs->set_in(0, Location::RequiresRegister());
+  if (CanBeImmediateIndex(index(), class_id(), IsExternal())) {
+    locs->set_in(1, Location::Constant(index()->definition()->AsConstant()));
+  } else {
+    locs->set_in(1, Location::RequiresRegister());
+  }
+
+  // TODO(jgruber): Handle mints properly once possible.
+  ASSERT(representation() == kTagged);
+  locs->set_out(0, Location::RequiresRegister());
+
+  return locs;
+}
+
+
+void LoadCodeUnitsInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  const Register array = locs()->in(0).reg();
+  const Location index = locs()->in(1);
+
+  Address element_address = index.IsRegister()
+      ? __ ElementAddressForRegIndex(true,  // Load.
+                                     IsExternal(), class_id(), index_scale(),
+                                     array, index.reg())
+      : __ ElementAddressForIntIndex(
+            IsExternal(), class_id(), index_scale(),
+            array, Smi::Cast(index.constant()).Value());
+  // Warning: element_address may use register TMP as base.
+
+  ASSERT(representation() == kTagged);
+  Register result = locs()->out(0).reg();
+  switch (class_id()) {
+    case kOneByteStringCid:
+      switch (element_count()) {
+        case 1: __ lbu(result, element_address); break;
+        case 2: __ lhu(result, element_address); break;
+        case 4:  // Loading multiple code units is disabled on MIPS.

[Florian Schneider, 2014/10/01 17:04:13]

Maybe add a TODO for supporting this?

[jgruber1, 2014/10/03 18:59:51]

The associated TODO is for kEnableUnalignedAccesses in regexp_assembler.cc.

+        default: UNREACHABLE();
+      }
+      __ SmiTag(result);
+      break;
+    case kTwoByteStringCid:
+      switch (element_count()) {
+        case 1: __ lhu(result, element_address); break;
+        case 2:  // Loading multiple code units is disabled on MIPS.
+        default: UNREACHABLE();
+      }
+      __ SmiTag(result);
+      break;
+    default:
+      UNREACHABLE();
+      break;
+  }
+}
+
+
 Representation StoreIndexedInstr::RequiredInputRepresentation(
     intptr_t idx) const {
   // Array can be a Dart object or a pointer to external data.
@@ -3657,6 +3742,28 @@ void MathUnaryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 }
 
 
+LocationSummary* CaseInsensitiveCompareUC16Instr::MakeLocationSummary(
+    Isolate* isolate, bool opt) const {
+  const intptr_t kNumTemps = 0;
+  LocationSummary* summary = new(isolate) LocationSummary(
+      isolate, InputCount(), kNumTemps, LocationSummary::kCall);
+  summary->set_in(0, Location::RegisterLocation(A0));
+  summary->set_in(1, Location::RegisterLocation(A1));
+  summary->set_in(2, Location::RegisterLocation(A2));
+  summary->set_in(3, Location::RegisterLocation(A3));
+  summary->set_out(0, Location::RegisterLocation(V0));
+  return summary;
+}
+
+
+void CaseInsensitiveCompareUC16Instr::EmitNativeCode(
+    FlowGraphCompiler* compiler) {
+
+  // Call the function.
+  __ CallRuntime(TargetFunction(), TargetFunction().argument_count());
+}
+
+
 LocationSummary* MathMinMaxInstr::MakeLocationSummary(Isolate* isolate,
                                                       bool opt) const {
   if (result_cid() == kDoubleCid) {
@@ -4747,6 +4854,19 @@ void GraphEntryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 }
 
 
+void IndirectEntryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  __ Bind(compiler->GetJumpLabel(this));
+  if (!compiler->is_optimizing()) {
+    compiler->AddCurrentDescriptor(RawPcDescriptors::kDeopt,
+                                   deopt_id_,
+                                   Scanner::kNoSourcePos);
+  }
+  if (HasParallelMove()) {
+    compiler->parallel_move_resolver()->EmitNativeCode(parallel_move());
+  }
+}
+
+
 LocationSummary* GotoInstr::MakeLocationSummary(Isolate* isolate,
                                                 bool opt) const {
   return new(isolate) LocationSummary(isolate, 0, 0, LocationSummary::kNoCall);
@@ -4780,6 +4900,40 @@ void GotoInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 }
 
 
+LocationSummary* IndirectGotoInstr::MakeLocationSummary(Isolate* isolate,
+                                                        bool opt) const {
+  const intptr_t kNumInputs = 1;
+  const intptr_t kNumTemps = 1;
+
+  LocationSummary* locs = new(isolate) LocationSummary(
+        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+
+  locs->set_in(0, Location::RequiresRegister());
+  locs->set_temp(0, Location::RequiresRegister());
+
+  return locs;
+}
+
+
+void IndirectGotoInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  Register sum_reg = locs()->temp_slot(0)->reg();
+
+  // Load from [current frame pointer] + kPcMarkerSlotFromFp.
+  __ lw(sum_reg, Address(FP, kPcMarkerSlotFromFp * kWordSize));
+
+  // Subtract the entrypoint offset.
+  __ AddImmediate(sum_reg, -Assembler::EntryPointToPcMarkerOffset());
+
+  // Add the offset.
+  Register offset_reg = locs()->in(0).reg();
+  __ SmiUntag(offset_reg);
+  __ addu(sum_reg, sum_reg, offset_reg);
+
+  // Jump to the absolute address.
+  __ jr(sum_reg);
+}
+
+
 LocationSummary* CurrentContextInstr::MakeLocationSummary(Isolate* isolate,
                                                           bool opt) const {
   return LocationSummary::Make(isolate,