From 7655f29fabc0a12765de828914a18314382e5a35 Mon Sep 17 00:00:00 2001
From: Ian Rogers <irogers@google.com>
Date: Mon, 29 Jul 2013 11:07:13 -0700
Subject: Portable refactorings.

Separate quick from portable entrypoints.
Move architectural dependencies into arch.

Change-Id: I9adbc0a9782e2959fdc3308215f01e3107632b7c
---
 .../portable/portable_thread_entrypoints.cc        | 99 ++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 runtime/entrypoints/portable/portable_thread_entrypoints.cc

(limited to 'runtime/entrypoints/portable/portable_thread_entrypoints.cc')

diff --git a/runtime/entrypoints/portable/portable_thread_entrypoints.cc b/runtime/entrypoints/portable/portable_thread_entrypoints.cc
new file mode 100644
index 0000000..dac7388
--- /dev/null
+++ b/runtime/entrypoints/portable/portable_thread_entrypoints.cc
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2012 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 "entrypoints/entrypoint_utils.h"
+#include "mirror/abstract_method.h"
+#include "mirror/object-inl.h"
+#include "verifier/dex_gc_map.h"
+#include "stack.h"
+
+namespace art {
+
+class ShadowFrameCopyVisitor : public StackVisitor {
+ public:
+  explicit ShadowFrameCopyVisitor(Thread* self) : StackVisitor(self, NULL), prev_frame_(NULL),
+      top_frame_(NULL) {}
+
+  bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+    if (IsShadowFrame()) {
+      ShadowFrame* cur_frame = GetCurrentShadowFrame();
+      size_t num_regs = cur_frame->NumberOfVRegs();
+      mirror::AbstractMethod* method = cur_frame->GetMethod();
+      uint32_t dex_pc = cur_frame->GetDexPC();
+      ShadowFrame* new_frame = ShadowFrame::Create(num_regs, NULL, method, dex_pc);
+
+      const uint8_t* gc_map = method->GetNativeGcMap();
+      uint32_t gc_map_length = static_cast<uint32_t>((gc_map[0] << 24) |
+                                                     (gc_map[1] << 16) |
+                                                     (gc_map[2] << 8) |
+                                                     (gc_map[3] << 0));
+      verifier::DexPcToReferenceMap dex_gc_map(gc_map + 4, gc_map_length);
+      const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc);
+      for (size_t reg = 0; reg < num_regs; ++reg) {
+        if (TestBitmap(reg, reg_bitmap)) {
+          new_frame->SetVRegReference(reg, cur_frame->GetVRegReference(reg));
+        } else {
+          new_frame->SetVReg(reg, cur_frame->GetVReg(reg));
+        }
+      }
+
+      if (prev_frame_ != NULL) {
+        prev_frame_->SetLink(new_frame);
+      } else {
+        top_frame_ = new_frame;
+      }
+      prev_frame_ = new_frame;
+    }
+    return true;
+  }
+
+  ShadowFrame* GetShadowFrameCopy() {
+    return top_frame_;
+  }
+
+ private:
+  static bool TestBitmap(int reg, const uint8_t* reg_vector) {
+    return ((reg_vector[reg / 8] >> (reg % 8)) & 0x01) != 0;
+  }
+
+  ShadowFrame* prev_frame_;
+  ShadowFrame* top_frame_;
+};
+
+extern "C" void art_portable_test_suspend_from_code(Thread* self)
+    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+  CheckSuspend(self);
+  if (Runtime::Current()->GetInstrumentation()->ShouldPortableCodeDeoptimize()) {
+    // Save out the shadow frame to the heap
+    ShadowFrameCopyVisitor visitor(self);
+    visitor.WalkStack(true);
+    self->SetDeoptimizationShadowFrame(visitor.GetShadowFrameCopy());
+    self->SetDeoptimizationReturnValue(JValue());
+    self->SetException(ThrowLocation(), reinterpret_cast<mirror::Throwable*>(-1));
+  }
+}
+
+extern "C" ShadowFrame* art_portable_push_shadow_frame_from_code(Thread* thread,
+                                                                 ShadowFrame* new_shadow_frame,
+                                                                 mirror::AbstractMethod* method,
+                                                                 uint32_t num_vregs) {
+  ShadowFrame* old_frame = thread->PushShadowFrame(new_shadow_frame);
+  new_shadow_frame->SetMethod(method);
+  new_shadow_frame->SetNumberOfVRegs(num_vregs);
+  return old_frame;
+}
+
+}  // namespace art
-- 
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