diff --git a/compiler/utils/assembler.h b/compiler/utils/assembler.h
index 672e150..0381af3 100644
--- a/compiler/utils/assembler.h
+++ b/compiler/utils/assembler.h
@@ -199,13 +199,18 @@
     *reinterpret_cast<T*>(contents_ + position) = value;
   }
 
-  void Move(size_t newposition, size_t oldposition) {
-    CHECK(HasEnsuredCapacity());
-    // Move the contents of the buffer from oldposition to
-    // newposition by nbytes.
-    size_t nbytes = Size() - oldposition;
-    memmove(contents_ + newposition, contents_ + oldposition, nbytes);
-    cursor_ += newposition - oldposition;
+  void Resize(size_t new_size) {
+    if (new_size > Capacity()) {
+      ExtendCapacity(new_size);
+    }
+    cursor_ = contents_ + new_size;
+  }
+
+  void Move(size_t newposition, size_t oldposition, size_t size) {
+    // Move a chunk of the buffer from oldposition to newposition.
+    DCHECK_LE(oldposition + size, Size());
+    DCHECK_LE(newposition + size, Size());
+    memmove(contents_ + newposition, contents_ + oldposition, size);
   }
 
   // Emit a fixup at the current location.
@@ -350,7 +355,7 @@
     return data + capacity - kMinimumGap;
   }
 
-  void ExtendCapacity();
+  void ExtendCapacity(size_t min_capacity = 0u);
 
   friend class AssemblerFixup;
 };
@@ -376,8 +381,8 @@
  public:
   static Assembler* Create(InstructionSet instruction_set);
 
-  // Emit slow paths queued during assembly
-  virtual void EmitSlowPaths() { buffer_.EmitSlowPaths(this); }
+  // Finalize the code; emit slow paths, fixup branches, add literal pool, etc.
+  virtual void FinalizeCode() { buffer_.EmitSlowPaths(this); }
 
   // Size of generated code
   virtual size_t CodeSize() const { return buffer_.Size(); }