Merge "Refactor exception handling for deoptimization"

1 files changed, 87 insertions, 0 deletions

diff --git a/runtime/deoptimize_stack_visitor.cc b/runtime/deoptimize_stack_visitor.cc
new file mode 100644
index 0000000000..f2eaf00856
--- /dev/null
+++ b/runtime/deoptimize_stack_visitor.cc
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "deoptimize_stack_visitor.h"
+
+#include "mirror/art_method-inl.h"
+#include "object_utils.h"
+#include "quick_exception_handler.h"
+#include "sirt_ref-inl.h"
+#include "verifier/method_verifier.h"
+
+namespace art {
+
+bool DeoptimizeStackVisitor::VisitFrame() {
+  exception_handler_->SetHandlerFrameId(GetFrameId());
+  mirror::ArtMethod* method = GetMethod();
+  if (method == nullptr) {
+    // This is the upcall, we remember the frame and last pc so that we may long jump to them.
+    exception_handler_->SetHandlerQuickFramePc(GetCurrentQuickFramePc());
+    exception_handler_->SetHandlerQuickFrame(GetCurrentQuickFrame());
+    return false;  // End stack walk.
+  } else if (method->IsRuntimeMethod()) {
+    // Ignore callee save method.
+    DCHECK(method->IsCalleeSaveMethod());
+    return true;
+  } else {
+    return HandleDeoptimization(method);
+  }
+}
+
+bool DeoptimizeStackVisitor::HandleDeoptimization(mirror::ArtMethod* m) {
+  MethodHelper mh(m);
+  const DexFile::CodeItem* code_item = mh.GetCodeItem();
+  CHECK(code_item != nullptr);
+  uint16_t num_regs = code_item->registers_size_;
+  uint32_t dex_pc = GetDexPc();
+  const Instruction* inst = Instruction::At(code_item->insns_ + dex_pc);
+  uint32_t new_dex_pc = dex_pc + inst->SizeInCodeUnits();
+  ShadowFrame* new_frame = ShadowFrame::Create(num_regs, nullptr, m, new_dex_pc);
+  SirtRef<mirror::DexCache> dex_cache(self_, mh.GetDexCache());
+  SirtRef<mirror::ClassLoader> class_loader(self_, mh.GetClassLoader());
+  verifier::MethodVerifier verifier(&mh.GetDexFile(), &dex_cache, &class_loader,
+                                    &mh.GetClassDef(), code_item, m->GetDexMethodIndex(), m,
+                                    m->GetAccessFlags(), false, true);
+  verifier.Verify();
+  std::vector<int32_t> kinds = verifier.DescribeVRegs(dex_pc);
+  for (uint16_t reg = 0; reg < num_regs; ++reg) {
+    VRegKind kind = static_cast<VRegKind>(kinds.at(reg * 2));
+    switch (kind) {
+      case kUndefined:
+        new_frame->SetVReg(reg, 0xEBADDE09);
+        break;
+      case kConstant:
+        new_frame->SetVReg(reg, kinds.at((reg * 2) + 1));
+        break;
+      case kReferenceVReg:
+        new_frame->SetVRegReference(reg,
+                                    reinterpret_cast<mirror::Object*>(GetVReg(m, reg, kind)));
+        break;
+      default:
+        new_frame->SetVReg(reg, GetVReg(m, reg, kind));
+        break;
+    }
+  }
+  if (prev_shadow_frame_ != nullptr) {
+    prev_shadow_frame_->SetLink(new_frame);
+  } else {
+    exception_handler_->SetTopShadowFrame(new_frame);
+  }
+  prev_shadow_frame_ = new_frame;
+  return true;
+}
+
+}  // namespace art