1 //===- InlinerPass.h - Code common to all inliners --------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines a simple policy-based bottom-up inliner. This file
11 // implements all of the boring mechanics of the bottom-up inlining, while the
12 // subclass determines WHAT to inline, which is the much more interesting
15 //===----------------------------------------------------------------------===//
20 #include "llvm/CallGraphSCCPass.h"
25 /// Inliner - This class contains all of the helper code which is used to
26 /// perform the inlining operations that does not depend on the policy.
28 struct Inliner : public CallGraphSCCPass {
29 explicit Inliner(const void *ID);
31 /// getAnalysisUsage - For this class, we declare that we require and preserve
32 /// the call graph. If the derived class implements this method, it should
33 /// always explicitly call the implementation here.
34 virtual void getAnalysisUsage(AnalysisUsage &Info) const;
36 // Main run interface method, this implements the interface required by the
38 virtual bool runOnSCC(const std::vector<CallGraphNode *> &SCC);
40 // doFinalization - Remove now-dead linkonce functions at the end of
41 // processing to avoid breaking the SCC traversal.
42 virtual bool doFinalization(CallGraph &CG);
45 /// This method returns the value specified by the -inline-threshold value,
46 /// specified on the command line. This is typically not directly needed.
48 unsigned getInlineThreshold() const { return InlineThreshold; }
50 /// getInlineCost - This method must be implemented by the subclass to
51 /// determine the cost of inlining the specified call site. If the cost
52 /// returned is greater than the current inline threshold, the call site is
55 virtual int getInlineCost(CallSite CS) = 0;
58 // InlineThreshold - Cache the value here for easy access.
59 unsigned InlineThreshold;
62 } // End llvm namespace