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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 LLVM_TRANSFORMS_IPO_INLINERPASS_H
#define LLVM_TRANSFORMS_IPO_INLINERPASS_H
#include "llvm/Analysis/CallGraphSCCPass.h"
namespace llvm {
class AssumptionCacheTracker;
class CallSite;
class DataLayout;
class InlineCost;
template <class PtrType, unsigned SmallSize> class SmallPtrSet;
/// 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(char &ID);
explicit Inliner(char &ID, bool InsertLifetime);
/// 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.
void getAnalysisUsage(AnalysisUsage &Info) const override;
// Main run interface method, this implements the interface required by the
// Pass class.
bool runOnSCC(CallGraphSCC &SCC) override;
using llvm::Pass::doFinalization;
// doFinalization - Remove now-dead linkonce functions at the end of
// processing to avoid breaking the SCC traversal.
bool doFinalization(CallGraph &CG) override;
/// 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;
/// removeDeadFunctions - Remove dead functions.
///
/// This also includes a hack in the form of the 'AlwaysInlineOnly' flag
/// which restricts it to deleting functions with an 'AlwaysInline'
/// attribute. This is useful for the InlineAlways pass that only wants to
/// deal with that subset of the functions.
bool removeDeadFunctions(CallGraph &CG, bool AlwaysInlineOnly = false);
/// This function performs the main work of the pass. The default
/// of Inlinter::runOnSCC() calls skipSCC() before calling this method, but
/// derived classes which cannot be skipped can override that method and
/// call this function unconditionally.
bool inlineCalls(CallGraphSCC &SCC);
private:
// InsertLifetime - Insert @llvm.lifetime intrinsics.
bool InsertLifetime;
/// shouldInline - Return true if the inliner should attempt to
/// inline at the given CallSite.
bool shouldInline(CallSite CS);
/// Return true if inlining of CS can block the caller from being
/// inlined which is proved to be more beneficial. \p IC is the
/// estimated inline cost associated with callsite \p CS.
/// \p TotalAltCost will be set to the estimated cost of inlining the caller
/// if \p CS is suppressed for inlining.
bool shouldBeDeferred(Function *Caller, CallSite CS, InlineCost IC,
int &TotalAltCost);
protected:
AssumptionCacheTracker *ACT;
};
} // End llvm namespace
#endif
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