Pattern match on generated code to find edge counters.

runtime/vm/flow_graph_compiler.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_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/cha.h"
 #include "vm/dart_entry.h"
@@ skipping 51 matching lines @@
   }
 }
 
 
 FlowGraphCompiler::FlowGraphCompiler(Assembler* assembler,
                                      FlowGraph* flow_graph,
                                      bool is_optimizing)
     : assembler_(assembler),
       parsed_function_(flow_graph->parsed_function()),
       flow_graph_(*flow_graph),
-      block_order_(*flow_graph->codegen_block_order(is_optimizing)),
+      block_order_(*flow_graph->CodegenBlockOrder(is_optimizing)),
       current_block_(NULL),
       exception_handlers_list_(NULL),
       pc_descriptors_list_(NULL),
       stackmap_table_builder_(
           is_optimizing ? new StackmapTableBuilder() : NULL),
       block_info_(block_order_.length()),
       deopt_infos_(),
       static_calls_target_table_(GrowableObjectArray::ZoneHandle(
           GrowableObjectArray::New())),
       is_optimizing_(is_optimizing),
@@ skipping 135 matching lines @@
       nonempty_label = GetJumpLabel(block);
     }
   }
 
   ASSERT(block_order()[0]->IsGraphEntry());
   BlockInfo* block_info = block_info_[block_order()[0]->postorder_number()];
   block_info->set_next_nonempty_label(nonempty_label);
 }
 
 
+void FlowGraphCompiler::EmitInstructionPrologue(Instruction* instr) {
+  if (!is_optimizing()) {
+    if (FLAG_enable_type_checks && instr->IsAssertAssignable()) {
+      AssertAssignableInstr* assert = instr->AsAssertAssignable();
+      AddCurrentDescriptor(PcDescriptors::kDeopt,
+                           assert->deopt_id(),
+                           assert->token_pos());
+    } else if (instr->IsGuardField() ||
+               (instr->CanBecomeDeoptimizationTarget() && !instr->IsGoto())) {
+      // GuardField and instructions that can be deoptimization targets need
+      // to record their deopt id.  GotoInstr records its own so that it can
+      // control the placement.
+      AddCurrentDescriptor(PcDescriptors::kDeopt,
+                           instr->deopt_id(),
+                           Scanner::kDummyTokenIndex);
+    }
+    AllocateRegistersLocally(instr);
+  } else if (instr->MayThrow()  &&
+             (CurrentTryIndex() != CatchClauseNode::kInvalidTryIndex)) {
+    // Optimized try-block: Sync locals to fixed stack locations.
+    EmitTrySync(instr, CurrentTryIndex());
+  }
+}
+
+
 void FlowGraphCompiler::VisitBlocks() {
   CompactBlocks();
 
   for (intptr_t i = 0; i < block_order().length(); ++i) {
     // Compile the block entry.
     BlockEntryInstr* entry = block_order()[i];
     assembler()->Comment("B%" Pd "", entry->block_id());
     set_current_block(entry);
 
     if (WasCompacted(entry)) {
@@ skipping 871 matching lines @@
 
   for (int i = 0; i < len; i++) {
     sorted->Add(CidTarget(ic_data.GetReceiverClassIdAt(i),
                           &Function::ZoneHandle(ic_data.GetTargetAt(i)),
                           ic_data.GetCountAt(i)));
   }
   sorted->Sort(HighestCountFirst);
 }
 
 }  // namespace dart