Allows "Hello, world!" to run on ARM hardware.

runtime/vm/flow_graph_compiler_arm.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_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "lib/error.h"
@@ skipping 1175 matching lines @@
   // TODO(vegorov): consider saving only caller save (volatile) registers.
   const intptr_t fpu_registers = locs->live_registers()->fpu_registers();
   if (fpu_registers > 0) {
     UNIMPLEMENTED();
   }
 
   // Store general purpose registers with the lowest register number at the
   // lowest address.
   const intptr_t cpu_registers = locs->live_registers()->cpu_registers();
   ASSERT((cpu_registers & ~kAllCpuRegistersList) == 0);
-  __ PushList(cpu_registers);
+  if (cpu_registers != 0) {
+    __ PushList(cpu_registers);
+  }
 }
 
 
 void FlowGraphCompiler::RestoreLiveRegisters(LocationSummary* locs) {
   // General purpose registers have the lowest register number at the
   // lowest address.
   const intptr_t cpu_registers = locs->live_registers()->cpu_registers();
   ASSERT((cpu_registers & ~kAllCpuRegistersList) == 0);
-  __ PopList(cpu_registers);
+  if (cpu_registers != 0) {
+    __ PopList(cpu_registers);
+  }
 
   const intptr_t fpu_registers = locs->live_registers()->fpu_registers();
   if (fpu_registers > 0) {
     UNIMPLEMENTED();
   }
 }
 
 
 void FlowGraphCompiler::EmitTestAndCall(const ICData& ic_data,
                                         Register class_id_reg,
@@ skipping 255 matching lines @@
 void ParallelMoveResolver::RestoreFpuScratch(FpuRegister reg) {
   __ vldrd(reg, Address(SP, kDoubleSize, Address::PostIndex));
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM