llvm-project/llvm/lib/Transforms/IPO/Inliner.h

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//===- InlineCommon.h - Code common to all inliners -------------*- C++ -*-===//
//
// 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
#define DEBUG_TYPE "inline"
#include "llvm/CallGraphSCCPass.h"
#include <set>
class CallSite;
/// Inliner - This class contains all of the helper code which is used to
/// perform the inlining operations that does not depend on the policy.
///
struct Inliner : public CallGraphSCCPass {
Inliner();
// Main run interface method, this implements the interface required by the
// Pass class.
virtual bool runOnSCC(const std::vector<CallGraphNode *> &SCC);
/// 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 int getInlineCost(CallSite CS) = 0;
/// getRecursiveInlineCost - This method can be implemented by subclasses if
/// it wants to treat calls to functions within the current SCC specially. If
/// this method is not overloaded, it just chains to getInlineCost().
///
virtual int getRecursiveInlineCost(CallSite CS);
private:
unsigned InlineThreshold;
bool performInlining(CallSite CS, std::set<Function*> &SCC);
};
#endif