Manage MachineFunctions with an analysis Pass instead of the Annotable

mechanism. To support this, make MachineFunctionPass a little more
complete.

llvm-svn: 77654

1 files changed, 45 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/MachineFunctionAnalysis.cpp b/llvm/lib/CodeGen/MachineFunctionAnalysis.cpp
new file mode 100644
index 00000000000..8b7dba8121d
--- /dev/null
+++ b/llvm/lib/CodeGen/MachineFunctionAnalysis.cpp
@@ -0,0 +1,45 @@
+//===-- MachineFunctionAnalysis.cpp ---------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the definitions of the MachineFunctionAnalysis members.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/MachineFunctionAnalysis.h"
+#include "llvm/CodeGen/MachineFunction.h"
+using namespace llvm;
+
+// Register this pass with PassInfo directly to avoid having to define
+// a default constructor.
+static PassInfo
+X("Machine Function Analysis", "machine-function-analysis",
+  intptr_t(&MachineFunctionAnalysis::ID), 0,
+  /*CFGOnly=*/false, /*is_analysis=*/true);
+
+char MachineFunctionAnalysis::ID = 0;
+
+MachineFunctionAnalysis::MachineFunctionAnalysis(TargetMachine &tm,
+                                                 CodeGenOpt::Level OL) :
+  FunctionPass(&ID), TM(tm), OptLevel(OL), MF(0) {
+}
+
+bool MachineFunctionAnalysis::runOnFunction(Function &F) {
+  assert(!MF && "MachineFunctionAnalysis already initialized!");
+  MF = new MachineFunction(&F, TM);
+  return false;
+}
+
+void MachineFunctionAnalysis::releaseMemory() {
+  delete MF;
+  MF = 0;
+}
+
+void MachineFunctionAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
+  AU.setPreservesAll();
+}