| //===- 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 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, int Threshold, 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; |
| |
| /// 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; } |
| |
| /// Calculate the inline threshold for given Caller. This threshold is lower |
| /// if the caller is marked with OptimizeForSize and -inline-threshold is not |
| /// given on the comand line. It is higher if the callee is marked with the |
| /// inlinehint attribute. |
| /// |
| unsigned getInlineThreshold(CallSite CS) const; |
| |
| /// 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); |
| |
| private: |
| // InlineThreshold - Cache the value here for easy access. |
| unsigned InlineThreshold; |
| |
| // 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); |
| }; |
| |
| } // End llvm namespace |
| |
| #endif |