Revert "Revert "JIT root tables.""

Also  contains Revert "Support kJitTableAddress in x86/arm/arm64."

This reverts commit 4acd03638fcdb4e5d1666f8eec7eb3bf6d6be035.
This reverts commit 997d1217830c0a18b70faeabd53c04700a87d7d9.

Test: ART_USE_READ_BARRIER=true/false test-art-host test-art-target

Change-Id: I77cb1e9bf8f1b4c58b72d3cf5ca31ced2aaa1ea3

1 files changed, 26 insertions, 4 deletions

diff --git a/compiler/optimizing/optimizing_compiler.cc b/compiler/optimizing/optimizing_compiler.cc
index 6f84cdcc4f..1add660f1b 100644
--- a/compiler/optimizing/optimizing_compiler.cc
+++ b/compiler/optimizing/optimizing_compiler.cc
@@ -117,6 +117,7 @@ class CodeVectorAllocator FINAL : public CodeAllocator {
 
   size_t GetSize() const { return size_; }
   const ArenaVector<uint8_t>& GetMemory() const { return memory_; }
+  uint8_t* GetData() { return memory_.data(); }
 
  private:
   ArenaVector<uint8_t> memory_;
@@ -1126,7 +1127,7 @@ bool OptimizingCompiler::JitCompile(Thread* self,
                                     jit::JitCodeCache* code_cache,
                                     ArtMethod* method,
                                     bool osr) {
-  StackHandleScope<2> hs(self);
+  StackHandleScope<3> hs(self);
   Handle<mirror::ClassLoader> class_loader(hs.NewHandle(
       method->GetDeclaringClass()->GetClassLoader()));
   Handle<mirror::DexCache> dex_cache(hs.NewHandle(method->GetDexCache()));
@@ -1172,22 +1173,43 @@ bool OptimizingCompiler::JitCompile(Thread* self,
   }
 
   size_t stack_map_size = codegen->ComputeStackMapsSize();
-  uint8_t* stack_map_data = code_cache->ReserveData(self, stack_map_size, method);
-  if (stack_map_data == nullptr) {
+  size_t number_of_roots = codegen->GetNumberOfJitRoots();
+  ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
+  // We allocate an object array to ensure the JIT roots that we will collect in EmitJitRoots
+  // will be visible by the GC between EmitLiterals and CommitCode. Once CommitCode is
+  // executed, this array is not needed.
+  Handle<mirror::ObjectArray<mirror::Object>> roots(
+      hs.NewHandle(mirror::ObjectArray<mirror::Object>::Alloc(
+          self, class_linker->GetClassRoot(ClassLinker::kObjectArrayClass), number_of_roots)));
+  if (roots.Get() == nullptr) {
+    // Out of memory, just clear the exception to avoid any Java exception uncaught problems.
+    DCHECK(self->IsExceptionPending());
+    self->ClearException();
+    return false;
+  }
+  uint8_t* stack_map_data = nullptr;
+  uint8_t* roots_data = nullptr;
+  code_cache->ReserveData(
+      self, stack_map_size, number_of_roots, method, &stack_map_data, &roots_data);
+  if (stack_map_data == nullptr || roots_data == nullptr) {
     return false;
   }
   MaybeRecordStat(MethodCompilationStat::kCompiled);
   codegen->BuildStackMaps(MemoryRegion(stack_map_data, stack_map_size), *code_item);
+  codegen->EmitJitRoots(code_allocator.GetData(), roots, roots_data, dex_cache);
+
   const void* code = code_cache->CommitCode(
       self,
       method,
       stack_map_data,
+      roots_data,
       codegen->HasEmptyFrame() ? 0 : codegen->GetFrameSize(),
       codegen->GetCoreSpillMask(),
       codegen->GetFpuSpillMask(),
       code_allocator.GetMemory().data(),
       code_allocator.GetSize(),
-      osr);
+      osr,
+      roots);
 
   if (code == nullptr) {
     code_cache->ClearData(self, stack_map_data);