[llvm-mca] Add HardwareUnit and Context classes.
This patch moves the construction of the default backend from llvm-mca.cpp and
into mca::Context. The Context class is responsible for holding ownership of
the simulated hardware components. These components are subclasses of
HardwareUnit. Right now the HardwareUnit is pretty bare-bones, but eventually
we might want to add some common functionality across all hardware components,
such as isReady() or something similar.
I have a feeling this patch will probably need some updates, but it's a start.
One thing I am not particularly fond of is the rather large interface for
createDefaultPipeline. That convenience routine takes a rather large set of
inputs from the llvm-mca driver, where many of those inputs are generated via
command line options.
One item I think we might want to change is the separating of ownership of
hardware components (owned by the context) and the pipeline (which owns
Stages). In short, a Pipeline owns Stages, a Context (currently) owns hardware.
The Pipeline's Stages make use of the components, and thus there is a lifetime
dependency generated. The components must outlive the pipeline. We could solve
this by having the Context also own the Pipeline, and not return a
unique_ptr<Pipeline>. Now that I think about it, I like that idea more.
Differential Revision: https://reviews.llvm.org/D48691
llvm-svn: 336456
diff --git a/llvm/tools/llvm-mca/HardwareUnit.cpp b/llvm/tools/llvm-mca/HardwareUnit.cpp
new file mode 100644
index 0000000..103cde9
--- /dev/null
+++ b/llvm/tools/llvm-mca/HardwareUnit.cpp
@@ -0,0 +1,23 @@
+//===------------------------- HardwareUnit.cpp -----------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+/// \file
+///
+/// This file defines the anchor for the base class that describes
+/// simulated hardware units.
+///
+//===----------------------------------------------------------------------===//
+
+#include "HardwareUnit.h"
+
+namespace mca {
+
+// Pin the vtable with this method.
+HardwareUnit::~HardwareUnit() = default;
+
+} // namespace mca