Add higher-level accesses to Environment. Print flow graph after register allocation. Most interest…

runtime/vm/compiler.cc

 // Copyright (c) 2012, 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/compiler.h"
 
 #include "vm/assembler.h"
 #include "vm/ast_printer.h"
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 16 matching lines @@
 #include "vm/timer.h"
 
 namespace dart {
 
 DEFINE_FLAG(bool, disassemble, false, "Disassemble dart code.");
 DEFINE_FLAG(bool, trace_compiler, false, "Trace compiler operations.");
 DEFINE_FLAG(int, deoptimization_counter_threshold, 5,
     "How many times we allow deoptimization before we disallow"
     " certain optimizations");
 DEFINE_FLAG(bool, trace_bailout, false, "Print bailout from ssa compiler.");
+DECLARE_FLAG(bool, print_flow_graph);
 DECLARE_FLAG(bool, use_ssa);
 
 
 // Compile a function. Should call only if the function has not been compiled.
 //   Arg0: function object.
 DEFINE_RUNTIME_ENTRY(CompileFunction, 1) {
   ASSERT(arguments.Count() == kCompileFunctionRuntimeEntry.argument_count());
   const Function& function = Function::CheckedHandle(arguments.At(0));
   ASSERT(!function.HasCode());
   const Error& error = Error::Handle(Compiler::CompileFunction(function));
@@ skipping 118 matching lines @@
       }
       if (optimized) {
         FlowGraphOptimizer optimizer(block_order);
         optimizer.ApplyICData();
 
         if (use_ssa) {
           // Perform register allocation on the SSA graph.
           FlowGraphAllocator allocator(block_order, &graph_builder);
           allocator.AllocateRegisters();
         }
+        if (FLAG_print_flow_graph) {
+          OS::Print("After Optimizations:\n");
+          FlowGraphPrinter printer(Function::Handle(), block_order);
+          printer.PrintBlocks();
+        }
       }
     }
 
     bool is_leaf = false;
     if (optimized) {
       FlowGraphAnalyzer analyzer(block_order);
       analyzer.Analyze();
       is_leaf = analyzer.is_leaf();
     }
     Assembler assembler;
@@ skipping 291 matching lines @@
     isolate->object_store()->clear_sticky_error();
     isolate->set_long_jump_base(base);
     return result.raw();
   }
   UNREACHABLE();
   return Object::null();
 }
 
 
 }  // namespace dart