Add a stack slot coloring pass. Not yet enabled.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51934 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/LiveStackAnalysis.h

@@ -0,0 +1,71 @@
+//===-- LiveStackAnalysis.h - Live Stack Slot Analysis ----------*- C++ -*-===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_LIVESTACK_ANALYSIS_H
+#define LLVM_CODEGEN_LIVESTACK_ANALYSIS_H
+
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/LiveInterval.h"
+#include "llvm/Support/Allocator.h"
+#include <map>
+
+namespace llvm {
+
+  class LiveStacks : public MachineFunctionPass {
+    /// Special pool allocator for VNInfo's (LiveInterval val#).
+    ///
+    BumpPtrAllocator VNInfoAllocator;
+
+    /// s2iMap - Stack slot indices to live interval mapping.
+    ///
+    typedef std::map<int, LiveInterval> SS2IntervalMap;
+    SS2IntervalMap s2iMap;
+
+  public:
+    static char ID; // Pass identification, replacement for typeid
+    LiveStacks() : MachineFunctionPass((intptr_t)&ID) {}
+
+    typedef SS2IntervalMap::iterator iterator;
+    typedef SS2IntervalMap::const_iterator const_iterator;
+    const_iterator begin() const { return s2iMap.begin(); }
+    const_iterator end() const { return s2iMap.end(); }
+    iterator begin() { return s2iMap.begin(); }
+    iterator end() { return s2iMap.end(); }
+    unsigned getNumIntervals() const { return (unsigned)s2iMap.size(); }
+
+    LiveInterval &getOrCreateInterval(int Slot) {
+      SS2IntervalMap::iterator I = s2iMap.find(Slot);
+      if (I == s2iMap.end())
+        I = s2iMap.insert(I,std::make_pair(Slot,LiveInterval(Slot,0.0F,true)));
+      return I->second;
+    }
+
+    BumpPtrAllocator& getVNInfoAllocator() { return VNInfoAllocator; }
+
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const;
+    virtual void releaseMemory();
+
+    /// runOnMachineFunction - pass entry point
+    virtual bool runOnMachineFunction(MachineFunction&);
+
+    /// print - Implement the dump method.
+    virtual void print(std::ostream &O, const Module* = 0) const;
+    void print(std::ostream *O, const Module* M = 0) const {
+      if (O) print(*O, M);
+    }
+  };
+}
+
+#endif /* LLVM_CODEGEN_LIVESTACK_ANALYSIS_H */