Implement breakpoint for closure calls

runtime/vm/debugger_arm.cc

 // Copyright (c) 2011, 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"
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/cpu.h"
 #include "vm/debugger.h"
 #include "vm/instructions.h"
@@ skipping 12 matching lines @@
 RawInstance* ActivationFrame::GetInstanceCallReceiver(
                  intptr_t num_actual_args) {
   ASSERT(num_actual_args > 0);  // At minimum we have a receiver on the stack.
   // Stack pointer points to last argument that was pushed on the stack.
   uword receiver_addr = sp() + ((num_actual_args - 1) * kWordSize);
   return reinterpret_cast<RawInstance*>(
              *reinterpret_cast<uword*>(receiver_addr));
 }
 
 
+RawObject* ActivationFrame::GetClosureObject(intptr_t num_actual_args) {
+  // At a minimum we have the closure object on the stack.
+  ASSERT(num_actual_args > 0);
+  // Stack pointer points to last argument that was pushed on the stack.
+  uword closure_addr = sp() + ((num_actual_args - 1) * kWordSize);
+  return reinterpret_cast<RawObject*>(
+             *reinterpret_cast<uword*>(closure_addr));
+}
+
+
 void CodeBreakpoint::PatchFunctionReturn() {
   uword* code = reinterpret_cast<uword*>(pc_ - 3 * Instr::kInstrSize);
   ASSERT(code[0] == 0xe8bd4c00);  // ldmia sp!, {pp, fp, lr}
   ASSERT(code[1] == 0xe28dd004);  // add sp, sp, #4
   ASSERT(code[2] == 0xe12fff1e);  // bx lr
 
   // Smash code with call instruction and target address.
   uword stub_addr = StubCode::BreakpointReturnEntryPoint();
   uint16_t target_lo = stub_addr & 0xffff;
   uint16_t target_hi = stub_addr >> 16;
@@ skipping 12 matching lines @@
   ASSERT((code[0] & 0xfff0f000) == 0xe300c000);
   code[0] = 0xe8bd4c00;  // ldmia sp!, {pp, fp, lr}
   code[1] = 0xe28dd004;  // add sp, sp, #4
   code[2] = 0xe12fff1e;  // bx lr
   CPU::FlushICache(pc_ - 3 * Instr::kInstrSize, 3 * Instr::kInstrSize);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM