[llvm-mca] Rename Backend to Pipeline. NFC.

Summary:
This change renames the Backend and BackendPrinter to Pipeline and PipelinePrinter respectively. 
Variables and comments have also been updated to reflect this change.

The reason for this rename, is to be slightly more correct about what MCA is modeling.  MCA models a Pipeline, which implies some logical sequence of stages. 

Reviewers: andreadb, courbet, RKSimon

Reviewed By: andreadb, courbet

Subscribers: mgorny, javed.absar, tschuett, gbedwell, llvm-commits

Differential Revision: https://reviews.llvm.org/D48496

llvm-svn: 335496

1 files changed, 52 insertions, 0 deletions

diff --git a/llvm/tools/llvm-mca/PipelinePrinter.h b/llvm/tools/llvm-mca/PipelinePrinter.h
new file mode 100644
index 00000000000..fe871414418
--- /dev/null
+++ b/llvm/tools/llvm-mca/PipelinePrinter.h
@@ -0,0 +1,52 @@
+//===--------------------- PipelinePrinter.h --------------------*- 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 implements class PipelinePrinter.
+///
+/// PipelinePrinter allows the customization of the performance report.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TOOLS_LLVM_MCA_PIPELINEPRINTER_H
+#define LLVM_TOOLS_LLVM_MCA_PIPELINEPRINTER_H
+
+#include "Pipeline.h"
+#include "View.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/raw_ostream.h"
+
+#define DEBUG_TYPE "llvm-mca"
+
+namespace mca {
+
+/// A printer class that knows how to collects statistics on the
+/// code analyzed by the llvm-mca tool.
+///
+/// This class knows how to print out the analysis information collected
+/// during the execution of the code. Internally, it delegates to other
+/// classes the task of printing out timeline information as well as
+/// resource pressure.
+class PipelinePrinter {
+  Pipeline &P;
+  llvm::SmallVector<std::unique_ptr<View>, 8> Views;
+
+public:
+  PipelinePrinter(Pipeline &pipeline) : P(pipeline) {}
+
+  void addView(std::unique_ptr<View> V) {
+    P.addEventListener(V.get());
+    Views.emplace_back(std::move(V));
+  }
+
+  void printReport(llvm::raw_ostream &OS) const;
+};
+} // namespace mca
+
+#endif // LLVM_TOOLS_LLVM_MCA_PIPELINEPRINTER_H