Use off-heap data for class check instructions

runtime/vm/intermediate_language_ia32.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/compiler.h"
@@ skipping 5805 matching lines @@
 
 
 void BranchInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   comparison()->EmitBranchCode(compiler, this);
 }
 
 
 LocationSummary* CheckClassInstr::MakeLocationSummary(Zone* zone,
                                                       bool opt) const {
   const intptr_t kNumInputs = 1;
-  const bool need_mask_temp = IsDenseSwitch() && !IsDenseMask(ComputeCidMask());
+  const bool need_mask_temp = IsBitTest();
   const intptr_t kNumTemps = !IsNullCheck() ? (need_mask_temp ? 2 : 1) : 0;
   LocationSummary* summary = new (zone)
       LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   if (!IsNullCheck()) {
     summary->set_temp(0, Location::RequiresRegister());
     if (need_mask_temp) {
       summary->set_temp(1, Location::RequiresRegister());
     }
   }
   return summary;
 }
 
 
-void CheckClassInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  Label* deopt = compiler->AddDeoptStub(deopt_id(), ICData::kDeoptCheckClass,
-                                        licm_hoisted_ ? ICData::kHoisted : 0);
-  if (IsNullCheck()) {
-    const Immediate& raw_null =
-        Immediate(reinterpret_cast<intptr_t>(Object::null()));
-    __ cmpl(locs()->in(0).reg(), raw_null);
-    ASSERT(DeoptIfNull() || DeoptIfNotNull());
-    Condition cond = DeoptIfNull() ? EQUAL : NOT_EQUAL;
-    __ j(cond, deopt);
-    return;
-  }
-
-  ASSERT((unary_checks().GetReceiverClassIdAt(0) != kSmiCid) ||
-         (unary_checks().NumberOfChecks() > 1));
-  Register value = locs()->in(0).reg();
-  Register temp = locs()->temp(0).reg();
-  Label is_ok;
-  if (unary_checks().GetReceiverClassIdAt(0) == kSmiCid) {
-    __ testl(value, Immediate(kSmiTagMask));
-    __ j(ZERO, &is_ok);
-  } else {
-    __ testl(value, Immediate(kSmiTagMask));
-    __ j(ZERO, deopt);
-  }
-  Register biased_cid = temp;
-  __ LoadClassId(biased_cid, value);
-
-  GrowableArray<CidRangeTarget> sorted_ic_data;
-  FlowGraphCompiler::SortICDataByCount(unary_checks(), &sorted_ic_data,
-                                       /* drop_smi = */ true);
-
-  if (IsDenseSwitch()) {
-    ASSERT(cids_[0] < cids_[cids_.length() - 1]);
-    __ subl(biased_cid, Immediate(cids_[0]));
-    __ cmpl(biased_cid, Immediate(cids_[cids_.length() - 1] - cids_[0]));
-    __ j(ABOVE, deopt);
-
-    intptr_t mask = ComputeCidMask();
-    if (!IsDenseMask(mask)) {
-      // Only need mask if there are missing numbers in the range.
-      ASSERT(cids_.length() > 2);
-      Register mask_reg = locs()->temp(1).reg();
-      __ movl(mask_reg, Immediate(mask));
-      __ bt(mask_reg, biased_cid);
-      __ j(NOT_CARRY, deopt);
-    }
-  } else {
-    const intptr_t num_checks = sorted_ic_data.length();
-    const bool use_near_jump = num_checks < 5;
-    int bias = 0;
-    for (intptr_t i = 0; i < num_checks; i++) {
-      const intptr_t cid_start = sorted_ic_data[i].cid_start;
-      const intptr_t cid_end = sorted_ic_data[i].cid_end;
-      ASSERT(cid_start > kSmiCid || cid_end < kSmiCid);
-      Condition no_match, match;
-      if (cid_start == cid_end) {
-        __ cmpl(biased_cid, Immediate(cid_start - bias));
-        no_match = NOT_EQUAL;
-        match = EQUAL;
-      } else {
-        // For class ID ranges use a subtract followed by an unsigned
-        // comparison to check both ends of the ranges with one comparison.
-        __ addl(biased_cid, Immediate(bias - cid_start));
-        bias = cid_start;
-        __ cmpl(biased_cid, Immediate(cid_end - cid_start));
-        no_match = ABOVE;
-        match = BELOW_EQUAL;
-      }
-
-      if (i == num_checks - 1) {
-        __ j(no_match, deopt);
-      } else {
-        if (use_near_jump) {
-          __ j(match, &is_ok, Assembler::kNearJump);
-        } else {
-          __ j(match, &is_ok);
-        }
-      }
-    }
-  }
-  __ Bind(&is_ok);
+void CheckClassInstr::EmitNullCheck(FlowGraphCompiler* compiler, Label* deopt) {
+  const Immediate& raw_null =
+      Immediate(reinterpret_cast<intptr_t>(Object::null()));
+  __ cmpl(locs()->in(0).reg(), raw_null);
+  ASSERT(IsDeoptIfNull() || IsDeoptIfNotNull());
+  Condition cond = IsDeoptIfNull() ? EQUAL : NOT_EQUAL;
+  __ j(cond, deopt);
+  return;

[Vyacheslav Egorov (Google), 2017/05/09 21:07:28]

delete return;

[erikcorry, 2017/05/10 08:47:43]

Done.

 }
 
 
+void CheckClassInstr::EmitBitTest(FlowGraphCompiler* compiler,
+                                  intptr_t min,
+                                  intptr_t max,
+                                  intptr_t mask,
+                                  Label* deopt) {
+  Register biased_cid = locs()->temp(0).reg();
+  __ subl(biased_cid, Immediate(min));
+  __ cmpl(biased_cid, Immediate(max - min));
+  __ j(ABOVE, deopt);
+
+  Register mask_reg = locs()->temp(1).reg();
+  __ movl(mask_reg, Immediate(mask));
+  __ bt(mask_reg, biased_cid);
+  __ j(NOT_CARRY, deopt);
+}
+
+
+int CheckClassInstr::EmitCheckCid(FlowGraphCompiler* compiler,
+                                  int bias,
+                                  intptr_t cid_start,
+                                  intptr_t cid_end,
+                                  bool is_last,
+                                  Label* is_ok,
+                                  Label* deopt,
+                                  bool use_near_jump) {
+  Register biased_cid = locs()->temp(0).reg();
+  Condition no_match, match;
+  if (cid_start == cid_end) {
+    __ cmpl(biased_cid, Immediate(cid_start - bias));
+    no_match = NOT_EQUAL;
+    match = EQUAL;
+  } else {
+    // For class ID ranges use a subtract followed by an unsigned
+    // comparison to check both ends of the ranges with one comparison.
+    __ addl(biased_cid, Immediate(bias - cid_start));
+    bias = cid_start;
+    __ cmpl(biased_cid, Immediate(cid_end - cid_start));
+    no_match = ABOVE;
+    match = BELOW_EQUAL;
+  }
+
+  if (is_last) {
+    __ j(no_match, deopt);
+  } else {
+    if (use_near_jump) {
+      __ j(match, is_ok, Assembler::kNearJump);
+    } else {
+      __ j(match, is_ok);
+    }
+  }
+  return bias;
+}
+
+
 LocationSummary* CheckSmiInstr::MakeLocationSummary(Zone* zone,
                                                     bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary = new (zone)
       LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   return summary;
 }
 
@@ skipping 1017 matching lines @@
   __ Drop(1);
   __ popl(result);
 }
 
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_IA32