4 files changed, 29 insertions, 0 deletions
diff --git a/compiler/utils/assembler.h b/compiler/utils/assembler.h
index 72ebdd3741..c23fd440dc 100644
--- a/compiler/utils/assembler.h
+++ b/compiler/utils/assembler.h
@@ -52,6 +52,23 @@ namespace x86_64 {
   class X86_64Assembler;
 }
 
+class ExternalLabel {
+ public:
+  ExternalLabel(const char* name, uword address)
+      : name_(name), address_(address) {
+    DCHECK(name != nullptr);
+  }
+
+  const char* name() const { return name_; }
+  uword address() const {
+    return address_;
+  }
+
+ private:
+  const char* name_;
+  const uword address_;
+};
+
 class Label {
  public:
   Label() : position_(0) {}
diff --git a/compiler/utils/scoped_arena_allocator.cc b/compiler/utils/scoped_arena_allocator.cc
index a78d28792b..bd78eaef0d 100644
--- a/compiler/utils/scoped_arena_allocator.cc
+++ b/compiler/utils/scoped_arena_allocator.cc
@@ -99,6 +99,7 @@ void* ArenaStack::AllocValgrind(size_t bytes, ArenaAllocKind kind) {
   }
   CurrentStats()->RecordAlloc(bytes, kind);
   top_ptr_ = ptr + rounded_bytes;
+  VALGRIND_MAKE_MEM_UNDEFINED(ptr, bytes);
   VALGRIND_MAKE_MEM_NOACCESS(ptr + bytes, rounded_bytes - bytes);
   return ptr;
 }
diff --git a/compiler/utils/x86/assembler_x86.cc b/compiler/utils/x86/assembler_x86.cc
index d242c17c8f..ebbb43a442 100644
--- a/compiler/utils/x86/assembler_x86.cc
+++ b/compiler/utils/x86/assembler_x86.cc
@@ -54,6 +54,16 @@ void X86Assembler::call(Label* label) {
 }
 
 
+void X86Assembler::call(const ExternalLabel& label) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  intptr_t call_start = buffer_.GetPosition();
+  EmitUint8(0xE8);
+  EmitInt32(label.address());
+  static const intptr_t kCallExternalLabelSize = 5;
+  DCHECK_EQ((buffer_.GetPosition() - call_start), kCallExternalLabelSize);
+}
+
+
 void X86Assembler::pushl(Register reg) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0x50 + reg);
diff --git a/compiler/utils/x86/assembler_x86.h b/compiler/utils/x86/assembler_x86.h
index 879f4ec795..f906a6f7c7 100644
--- a/compiler/utils/x86/assembler_x86.h
+++ b/compiler/utils/x86/assembler_x86.h
@@ -227,6 +227,7 @@ class X86Assembler FINAL : public Assembler {
   void call(Register reg);
   void call(const Address& address);
   void call(Label* label);
+  void call(const ExternalLabel& label);
 
   void pushl(Register reg);
   void pushl(const Address& address);