VM: Fix checked mode crash (issue 13831).

runtime/vm/flow_graph_compiler_ia32.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_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #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.");
 DEFINE_FLAG(bool, unbox_mints, true, "Optimize 64-bit integer arithmetic.");
 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);
 DECLARE_FLAG(bool, throw_on_javascript_int_overflow);
 
 
 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 1123 matching lines @@
     const intptr_t slot_base = parsed_function().first_stack_local_index();
     const Immediate& raw_null =
         Immediate(reinterpret_cast<intptr_t>(Object::null()));
     __ movl(EAX, raw_null);
     for (intptr_t i = 0; i < num_locals; ++i) {
       // Subtract index i (locals lie at lower addresses than EBP).
       __ movl(Address(EBP, (slot_base - i) * kWordSize), EAX);
     }
   }
 
-  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());
-  }
-
   ASSERT(!block_order().is_empty());
   VisitBlocks();
 
   __ int3();
   GenerateDeferredCode();
   // Emit function patching code. This will be swapped with the first 5 bytes
   // at entry point.
   AddCurrentDescriptor(PcDescriptors::kPatchCode,
                        Isolate::kNoDeoptId,
                        0);  // No token position.
@@ skipping 726 matching lines @@
   __ movups(reg, Address(ESP, 0));
   __ addl(ESP, Immediate(kFpuRegisterSize));
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32