VM: Share object pool entries for optimized static calls.

runtime/vm/flow_graph_compiler_arm64.cc

 // Copyright (c) 2014, 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_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 1154 matching lines @@
   if (is_optimizing()) {
     AddDeoptIndexAtCall(deopt_id_after, token_pos);
   } else {
     // Add deoptimization continuation point after the call and before the
     // arguments are removed.
     AddCurrentDescriptor(RawPcDescriptors::kDeopt, deopt_id_after, token_pos);
   }
 }
 
 
+void FlowGraphCompiler::GenerateStaticDartCall(intptr_t deopt_id,
+                                               TokenPosition token_pos,
+                                               const StubEntry& stub_entry,
+                                               RawPcDescriptors::Kind kind,
+                                               LocationSummary* locs,
+                                               const Function& target) {
+  // Call sites to the same target can share object pool entries. These
+  // call sites are never patched for breakpoints: the function is deoptimized
+  // and the unoptimized code with IC calls for static calls is patched instead.
+  ASSERT(is_optimizing());
+  __ BranchLinkWithEquivalence(stub_entry, target);
+
+  AddCurrentDescriptor(kind, deopt_id, token_pos);
+  RecordSafepoint(locs);
+  // Marks either the continuation point in unoptimized code or the
+  // deoptimization point in optimized code, after call.
+  const intptr_t deopt_id_after = Thread::ToDeoptAfter(deopt_id);
+  if (is_optimizing()) {
+    AddDeoptIndexAtCall(deopt_id_after, token_pos);
+  } else {
+    // Add deoptimization continuation point after the call and before the
+    // arguments are removed.
+    AddCurrentDescriptor(RawPcDescriptors::kDeopt, deopt_id_after, token_pos);
+  }
+  AddStaticCallTarget(target);
+}
+
+
 void FlowGraphCompiler::GenerateRuntimeCall(TokenPosition token_pos,
                                             intptr_t deopt_id,
                                             const RuntimeEntry& entry,
                                             intptr_t argument_count,
                                             LocationSummary* locs) {
   __ CallRuntime(entry, argument_count);
   AddCurrentDescriptor(RawPcDescriptors::kOther, deopt_id, token_pos);
   RecordSafepoint(locs);
   if (deopt_id != Thread::kNoDeoptId) {
     // Marks either the continuation point in unoptimized code or the
@@ skipping 182 matching lines @@
 void FlowGraphCompiler::EmitOptimizedStaticCall(
     const Function& function,
     const Array& arguments_descriptor,
     intptr_t argument_count,
     intptr_t deopt_id,
     TokenPosition token_pos,
     LocationSummary* locs) {
   __ LoadObject(R4, arguments_descriptor);
   // Do not use the code from the function, but let the code be patched so that
   // we can record the outgoing edges to other code.
-  GenerateDartCall(deopt_id,
-                   token_pos,
-                   *StubCode::CallStaticFunction_entry(),
-                   RawPcDescriptors::kOther,
-                   locs);
-  AddStaticCallTarget(function);
+  GenerateStaticDartCall(deopt_id,
+                         token_pos,
+                         *StubCode::CallStaticFunction_entry(),
+                         RawPcDescriptors::kOther,
+                         locs,
+                         function);
   __ Drop(argument_count);
 }
 
 
 Condition FlowGraphCompiler::EmitEqualityRegConstCompare(
     Register reg,
     const Object& obj,
     bool needs_number_check,
     TokenPosition token_pos) {
   if (needs_number_check) {
@@ skipping 148 matching lines @@
   __ tsti(R0, Immediate(kSmiTagMask));
   if (kFirstCheckIsSmi) {
     // Jump if receiver is not Smi.
     if (kNumChecks == 1) {
       __ b(failed, NE);
     } else {
       __ b(&after_smi_test, NE);
     }
     // Do not use the code from the function, but let the code be patched so
     // that we can record the outgoing edges to other code.
-    GenerateDartCall(deopt_id,
-                     token_index,
-                     *StubCode::CallStaticFunction_entry(),
-                     RawPcDescriptors::kOther,
-                     locs);
     const Function& function = Function::ZoneHandle(
         zone(), ic_data.GetTargetAt(0));
-    AddStaticCallTarget(function);
+    GenerateStaticDartCall(deopt_id,
+                           token_index,
+                           *StubCode::CallStaticFunction_entry(),
+                           RawPcDescriptors::kOther,
+                           locs,
+                           function);
     __ Drop(argument_count);
     if (kNumChecks > 1) {
       __ b(match_found);
     }
   } else {
     // Receiver is Smi, but Smi is not a valid class therefore fail.
     // (Smi class must be first in the list).
     __ b(failed, EQ);
   }
   __ Bind(&after_smi_test);
@@ skipping 14 matching lines @@
     ASSERT(sorted[i].cid != kSmiCid);
     Label next_test;
     __ CompareImmediate(R2, sorted[i].cid);
     if (kIsLastCheck) {
       __ b(failed, NE);
     } else {
       __ b(&next_test, NE);
     }
     // Do not use the code from the function, but let the code be patched so
     // that we can record the outgoing edges to other code.
-    GenerateDartCall(deopt_id,
-                     token_index,
-                     *StubCode::CallStaticFunction_entry(),
-                     RawPcDescriptors::kOther,
-                     locs);
     const Function& function = *sorted[i].target;
-    AddStaticCallTarget(function);
+    GenerateStaticDartCall(deopt_id,
+                           token_index,
+                           *StubCode::CallStaticFunction_entry(),
+                           RawPcDescriptors::kOther,
+                           locs,
+                           function);
     __ Drop(argument_count);
     if (!kIsLastCheck) {
       __ b(match_found);
     }
     __ Bind(&next_test);
   }
 }
 
 
 #undef __
@@ skipping 273 matching lines @@
 void ParallelMoveResolver::RestoreFpuScratch(FpuRegister reg) {
   __ PopDouble(reg);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64