Compile and simulate first dart function on arm generated from ast.

runtime/vm/flow_graph_allocator.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/flow_graph_allocator.h"
 
 #include "vm/bit_vector.h"
 #include "vm/intermediate_language.h"
 #include "vm/il_printer.h"
 #include "vm/flow_graph.h"
@@ skipping 59 matching lines @@
     kill_(block_order_.length()),
     live_in_(block_order_.length()),
     vreg_count_(flow_graph.max_virtual_register_number()),
     live_ranges_(flow_graph.max_virtual_register_number()),
     cpu_regs_(),
     fpu_regs_(),
     blocked_cpu_registers_(),
     blocked_fpu_registers_(),
     cpu_spill_slot_count_(0) {
   for (intptr_t i = 0; i < vreg_count_; i++) live_ranges_.Add(NULL);
 

[srdjan, 2013/02/26 23:23:09]

You don't need to set to false, blocked_cpu_registers_() is initializing the
array to false already.

[regis, 2013/02/27 00:19:26]

Where does this happen? Does blocked_cpu_registers_() in the initializer list of
the constructor initialize the array?

[srdjan, 2013/02/27 00:27:24]

Yes.

+  // Mark all available registers free.
+  for (intptr_t i = 0; i < kFirstFreeCpuRegister; i++) {
+    blocked_cpu_registers_[i] = true;
+  }
+  for (intptr_t i = kFirstFreeCpuRegister; i <= kLastFreeCpuRegister; i++) {
+    blocked_cpu_registers_[i] = false;
+  }
+  for (intptr_t i = kLastFreeCpuRegister + 1; i < kNumberOfCpuRegisters; i++) {
+    blocked_cpu_registers_[i] = true;
+  }
   blocked_cpu_registers_[CTX] = true;
   if (TMP != kNoRegister) {
     blocked_cpu_registers_[TMP] = true;
   }
+  if (PP != kNoRegister) {
+    blocked_cpu_registers_[PP] = true;
+  }
   blocked_cpu_registers_[SPREG] = true;
   blocked_cpu_registers_[FPREG] = true;
 
   // FpuTMP is used as scratch by optimized code and parallel move resolver.
   blocked_fpu_registers_[FpuTMP] = true;
 }
 
 
 // Remove environments from the instructions which can't deoptimize.
 // Replace dead phis uses with null values in environments.
@@ skipping 2416 matching lines @@
     OS::Print("-- [after ssa allocator] ir [%s] -------------\n",
               function.ToFullyQualifiedCString());
     FlowGraphPrinter printer(flow_graph_, true);
     printer.PrintBlocks();
     OS::Print("----------------------------------------------\n");
   }
 }
 
 
 }  // namespace dart