From 12a0222a01b6ffcc86becb5d98a31bf40608e2dd Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 4 Jun 2008 09:18:41 +0000
Subject: Add a stack slot coloring pass. Not yet enabled.

llvm-svn: 51934
---
 llvm/lib/CodeGen/LiveStackAnalysis.cpp | 50 ++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 llvm/lib/CodeGen/LiveStackAnalysis.cpp

(limited to 'llvm/lib/CodeGen/LiveStackAnalysis.cpp')

diff --git a/llvm/lib/CodeGen/LiveStackAnalysis.cpp b/llvm/lib/CodeGen/LiveStackAnalysis.cpp
new file mode 100644
index 00000000000..9358c105705
--- /dev/null
+++ b/llvm/lib/CodeGen/LiveStackAnalysis.cpp
@@ -0,0 +1,50 @@
+//===-- LiveStackAnalysis.cpp - Live Stack Slot Analysis ------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the live stack slot analysis pass. It is analogous to
+// live interval analysis except it's analyzing liveness of stack slots rather
+// than registers.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "livestacks"
+#include "llvm/CodeGen/LiveStackAnalysis.h"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/ADT/Statistic.h"
+using namespace llvm;
+
+char LiveStacks::ID = 0;
+static RegisterPass<LiveStacks> X("livestacks", "Live Stack Slot Analysis");
+
+void LiveStacks::getAnalysisUsage(AnalysisUsage &AU) const {
+  AU.setPreservesAll();
+}
+
+void LiveStacks::releaseMemory() {
+  // Release VNInfo memroy regions after all VNInfo objects are dtor'd.
+  VNInfoAllocator.Reset();
+  s2iMap.clear();
+}
+
+bool LiveStacks::runOnMachineFunction(MachineFunction &) {
+  // FIXME: No analysis is being done right now. We are relying on the
+  // register allocators to provide the information.
+  return false;
+}
+
+/// print - Implement the dump method.
+void LiveStacks::print(std::ostream &O, const Module* ) const {
+  O << "********** INTERVALS **********\n";
+  for (const_iterator I = begin(), E = end(); I != E; ++I) {
+    I->second.print(O);
+    O << "\n";
+  }
+}
-- 
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