Implement catch on ARM.

runtime/vm/intermediate_language_mips.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_MIPS.
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 67 matching lines @@
   Register result = locs()->in(0).reg();
   ASSERT(result == V0);
 #if defined(DEBUG)
   // TODO(srdjan): Fix for functions with finally clause.
   // A finally clause may leave a previously pushed return value if it
   // has its own return instruction. Method that have finally are currently
   // not optimized.
   if (!compiler->HasFinally()) {
     Label stack_ok;
     __ Comment("Stack Check");
-    const int sp_fp_dist = compiler->StackSize() + (-kFirstLocalSlotIndex - 1);
-    __ subu(T2, FP, SP);
+    const intptr_t fp_sp_dist =
+        (kFirstLocalSlotIndex + 1 - compiler->StackSize()) * kWordSize;
+    ASSERT(fp_sp_dist <= 0);
+    __ subu(T2, SP, FP);
 
-    __ BranchEqual(T2, sp_fp_dist * kWordSize, &stack_ok);
+    __ BranchEqual(T2, fp_sp_dist, &stack_ok);
     __ break_(0);
 
     __ Bind(&stack_ok);
   }
 #endif
   __ LeaveDartFrame();
   __ Ret();
 
   // Generate 2 NOP instructions so that the debugger can patch the return
   // pattern (1 instruction) with a call to the debug stub (3 instructions).
@@ skipping 1744 matching lines @@
 
 
 void CreateClosureInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   UNIMPLEMENTED();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS