Reapply "Initial implementation of on-stack replacement (OSR)."

runtime/vm/object.cc

 // Copyright (c) 2012, 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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
 #include "vm/code_generator.h"
 #include "vm/code_observers.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
 #include "vm/compiler_stats.h"
 #include "vm/dart.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
 #include "vm/datastream.h"
 #include "vm/debugger.h"
 #include "vm/deopt_instructions.h"
+#include "vm/disassembler.h"
 #include "vm/double_conversion.h"
 #include "vm/exceptions.h"
 #include "vm/flow_graph_builder.h"
 #include "vm/growable_array.h"
 #include "vm/heap.h"
 #include "vm/intermediate_language.h"
 #include "vm/intrinsifier.h"
 #include "vm/longjump.h"
 #include "vm/object_store.h"
 #include "vm/parser.h"
@@ skipping 7250 matching lines @@
   switch (DescriptorKind(index)) {
     case PcDescriptors::kDeopt:         return "deopt        ";
     case PcDescriptors::kEntryPatch:    return "entry-patch  ";
     case PcDescriptors::kPatchCode:     return "patch        ";
     case PcDescriptors::kLazyDeoptJump: return "lazy-deopt   ";
     case PcDescriptors::kIcCall:        return "ic-call      ";
     case PcDescriptors::kFuncCall:      return "fn-call      ";
     case PcDescriptors::kClosureCall:   return "closure-call ";
     case PcDescriptors::kReturn:        return "return       ";
     case PcDescriptors::kRuntimeCall:   return "runtime-call ";
+    case PcDescriptors::kOsrEntry:      return "osr-entry    ";
     case PcDescriptors::kOther:         return "other        ";
   }
   UNREACHABLE();
   return "";
 }
 
 
 void PcDescriptors::PrintHeaderString() {
   // 4 bits per hex digit + 2 for "0x".
   const int addr_width = (kBitsPerWord / 4) + 2;
@@ skipping 687 matching lines @@
   const intptr_t i = BinarySearchInSCallTable(pc);
   ASSERT(i >= 0);
   const Array& array =
       Array::Handle(raw_ptr()->static_calls_target_table_);
   ASSERT(code.IsNull() ||
          (code.function() == array.At(i + kSCallTableFunctionEntry)));
   array.SetAt(i + kSCallTableCodeEntry, code);
 }
 
 
+void Code::Disassemble() const {
+  const Instructions& instr = Instructions::Handle(instructions());
+  uword start = instr.EntryPoint();
+  Disassembler::Disassemble(start, start + instr.size(), comments());
+}
+
+
 const Code::Comments& Code::comments() const  {
   Comments* comments = new Code::Comments(Array::Handle(raw_ptr()->comments_));
   return *comments;
 }
 
 
 void Code::set_comments(const Code::Comments& comments) const {
   StorePointer(&raw_ptr()->comments_, comments.comments_.raw());
 }
 
@@ skipping 132 matching lines @@
         (descriptors.DescriptorKind(i) == kind)) {
       uword pc = descriptors.PC(i);
       ASSERT(ContainsInstructionAt(pc));
       return pc;
     }
   }
   return 0;
 }
 
 
+intptr_t Code::GetDeoptIdForOsr(uword pc) const {
+  const PcDescriptors& descriptors = PcDescriptors::Handle(pc_descriptors());
+  for (intptr_t i = 0; i < descriptors.Length(); ++i) {
+    if ((descriptors.PC(i) == pc) &&
+        (descriptors.DescriptorKind(i) == PcDescriptors::kOsrEntry)) {
+      return descriptors.DeoptId(i);
+    }
+  }
+  return Isolate::kNoDeoptId;
+}
+
+
 const char* Code::ToCString() const {
   const char* kFormat = "Code entry:%p";
   intptr_t len = OS::SNPrint(NULL, 0, kFormat, EntryPoint()) + 1;
   char* chars = Isolate::Current()->current_zone()->Alloc<char>(len);
   OS::SNPrint(chars, len, kFormat, EntryPoint());
   return chars;
 }
 
 
 uword Code::GetPatchCodePc() const {
@@ skipping 5438 matching lines @@
                                     space);
   return reinterpret_cast<RawWeakProperty*>(raw);
 }
 
 
 const char* WeakProperty::ToCString() const {
   return "_WeakProperty";
 }
 
 }  // namespace dart