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//===- InlinerPass.h - Code common to all inliners --------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a simple policy-based bottom-up inliner. This file
// implements all of the boring mechanics of the bottom-up inlining, while the
// subclass determines WHAT to inline, which is the much more interesting
// component.
//
//===----------------------------------------------------------------------===//
#ifndef INLINER_H
#define INLINER_H
#include "llvm/CallGraphSCCPass.h"
#include "llvm/Transforms/Utils/InlineCost.h"
#include "llvm/Target/TargetData.h"
namespace llvm {
class CallSite;
/// Inliner - This class contains all of the helper code which is used to
/// perform the inlining operations that do not depend on the policy.
///
struct Inliner : public CallGraphSCCPass {
explicit Inliner(void *ID);
explicit Inliner(void *ID, int Threshold);
/// getAnalysisUsage - For this class, we declare that we require and preserve
/// the call graph. If the derived class implements this method, it should
/// always explicitly call the implementation here.
virtual void getAnalysisUsage(AnalysisUsage &Info) const;
// Main run interface method, this implements the interface required by the
// Pass class.
virtual bool runOnSCC(const std::vector<CallGraphNode *> &SCC);
// doFinalization - Remove now-dead linkonce functions at the end of
// processing to avoid breaking the SCC traversal.
virtual bool doFinalization(CallGraph &CG);
// InlineCallIfPossible
bool InlineCallIfPossible(CallSite CS, CallGraph &CG,
const SmallPtrSet<Function*, 8> &SCCFunctions,
const TargetData &TD);
/// This method returns the value specified by the -inline-threshold value,
/// specified on the command line. This is typically not directly needed.
///
unsigned getInlineThreshold() const { return InlineThreshold; }
/// getInlineCost - This method must be implemented by the subclass to
/// determine the cost of inlining the specified call site. If the cost
/// returned is greater than the current inline threshold, the call site is
/// not inlined.
///
virtual InlineCost getInlineCost(CallSite CS) = 0;
// getInlineFudgeFactor - Return a > 1.0 factor if the inliner should use a
// higher threshold to determine if the function call should be inlined.
///
virtual float getInlineFudgeFactor(CallSite CS) = 0;
/// resetCachedCostInfo - erase any cached cost data from the derived class.
/// If the derived class has no such data this can be empty.
///
virtual void resetCachedCostInfo(Function* Caller) = 0;
/// removeDeadFunctions - Remove dead functions that are not included in
/// DNR (Do Not Remove) list.
bool removeDeadFunctions(CallGraph &CG,
SmallPtrSet<const Function *, 16> *DNR = NULL);
private:
// InlineThreshold - Cache the value here for easy access.
unsigned InlineThreshold;
/// shouldInline - Return true if the inliner should attempt to
/// inline at the given CallSite.
bool shouldInline(CallSite CS);
};
} // End llvm namespace
#endif
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