VM: Fix checked mode crash (issue 13831).

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 "vm/ast_printer.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/deopt_instructions.h"
 #include "vm/il_printer.h"
 #include "vm/locations.h"
 #include "vm/object_store.h"
 #include "vm/parser.h"
 #include "vm/stack_frame.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
 
 namespace dart {
 
 DEFINE_FLAG(bool, trap_on_deoptimization, false, "Trap on deoptimization.");
 DECLARE_FLAG(int, optimization_counter_threshold);
 DECLARE_FLAG(int, reoptimization_counter_threshold);
-DECLARE_FLAG(bool, print_ast);
-DECLARE_FLAG(bool, print_scopes);
 DECLARE_FLAG(bool, enable_type_checks);
 DECLARE_FLAG(bool, eliminate_type_checks);
 
 
 FlowGraphCompiler::~FlowGraphCompiler() {
   // BlockInfos are zone-allocated, so their destructors are not called.
   // Verify the labels explicitly here.
   for (int i = 0; i < block_info_.length(); ++i) {
     ASSERT(!block_info_[i]->jump_label()->IsLinked());
   }
@@ skipping 1116 matching lines @@
   if (!is_optimizing() && (num_locals > 0)) {
     __ Comment("Initialize spill slots");
     const intptr_t slot_base = parsed_function().first_stack_local_index();
     __ LoadImmediate(R0, reinterpret_cast<intptr_t>(Object::null()));
     for (intptr_t i = 0; i < num_locals; ++i) {
       // Subtract index i (locals lie at lower addresses than FP).
       __ str(R0, Address(FP, (slot_base - i) * kWordSize));
     }
   }
 
-  if (FLAG_print_scopes) {
-    // Print the function scope (again) after generating the prologue in order
-    // to see annotations such as allocation indices of locals.
-    if (FLAG_print_ast) {
-      // Second printing.
-      OS::Print("Annotated ");
-    }
-    AstPrinter::PrintFunctionScope(parsed_function());
-  }
-
   VisitBlocks();
 
   __ bkpt(0);
   GenerateDeferredCode();
   // Emit function patching code. This will be swapped with the first 3
   // instructions at entry point.
   AddCurrentDescriptor(PcDescriptors::kPatchCode,
                        Isolate::kNoDeoptId,
                        0);  // No token position.
   __ BranchPatchable(&StubCode::FixCallersTargetLabel());
@@ skipping 730 matching lines @@
   DRegister dreg = EvenDRegisterOf(reg);
   __ vldrd(dreg, Address(SP, kDoubleSize, Address::PostIndex));
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM