Version 1.1.0-dev.5.2

dart/runtime/vm/stub_code_x64.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"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 1894 matching lines @@
   __ jmp(&StubCode::TwoArgsCheckInlineCacheLabel());
   __ Bind(&test_three);
   __ cmpl(RCX, Immediate(3));
   __ j(NOT_EQUAL, &test_four, Assembler::kNearJump);
   __ jmp(&StubCode::ThreeArgsCheckInlineCacheLabel());
   __ Bind(&test_four);
   __ Stop("Unsupported number of arguments tested.");
 }
 
 
+// Called only from unoptimized code.
+void StubCode::GenerateDebugStepCheckStub(Assembler* assembler) {
+  // Check single stepping.
+  Label not_stepping;
+  __ movq(RAX, FieldAddress(CTX, Context::isolate_offset()));
+  __ movzxb(RAX, Address(RAX, Isolate::single_step_offset()));
+  __ cmpq(RAX, Immediate(0));
+  __ j(EQUAL, &not_stepping, Assembler::kNearJump);
+
+  __ EnterStubFrame();
+  __ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
+  __ LeaveStubFrame();
+  __ Bind(&not_stepping);
+  __ ret();
+}
+
+
 // Used to check class and type arguments. Arguments passed on stack:
 // TOS + 0: return address.
 // TOS + 1: instantiator type arguments (can be NULL).
 // TOS + 2: instance.
 // TOS + 3: SubtypeTestCache.
 // Result in RCX: null -> not found, otherwise result (true or false).
 static void GenerateSubtypeNTestCacheStub(Assembler* assembler, int n) {
   ASSERT((1 <= n) && (n <= 3));
   const intptr_t kInstantiatorTypeArgumentsInBytes = 1 * kWordSize;
   const intptr_t kInstanceOffsetInBytes = 2 * kWordSize;
@@ skipping 250 matching lines @@
 
   __ movq(left, Address(RSP, 2 * kWordSize));
   __ movq(right, Address(RSP, 1 * kWordSize));
   GenerateIdenticalWithNumberCheckStub(assembler, left, right);
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64