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https://github.com/c64scene-ar/llvm-6502.git
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5095e3d1d1
argpromotion and structretpromote. Basically, when replacing a function, they used the 'changeFunction' api which changes the entry in the function map (and steals/reuses the callgraph node). This has some interesting effects: first, the problem is that it doesn't update the "callee" edges in any callees of the function in the call graph. Second, this covers for a major problem in all the CGSCC pass stuff, which is that it is completely broken when functions are deleted if they *don't* reuse a CGN. (there is a cute little fixme about this though :). This patch changes the protocol that CGSCC passes must obey: now the CGSCC pass manager copies the SCC and preincrements its iterator to avoid passes invalidating it. This allows CGSCC passes to mutate the current SCC. However multiple passes may be run on that SCC, so if passes do this, they are now required to *update* the SCC to be current when they return. Other less interesting parts of this patch are that it makes passes update the CG more directly, eliminates changeFunction, and requires clients of replaceCallSite to specify the new callee CGN if they are changing it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80527 91177308-0d34-0410-b5e6-96231b3b80d8
87 lines
3.2 KiB
C++
87 lines
3.2 KiB
C++
//===- InlinerPass.h - Code common to all inliners --------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines a simple policy-based bottom-up inliner. This file
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// implements all of the boring mechanics of the bottom-up inlining, while the
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// subclass determines WHAT to inline, which is the much more interesting
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// component.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_IPO_INLINERPASS_H
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#define LLVM_TRANSFORMS_IPO_INLINERPASS_H
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#include "llvm/CallGraphSCCPass.h"
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namespace llvm {
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class CallSite;
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class TargetData;
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class InlineCost;
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template<class PtrType, unsigned SmallSize>
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class SmallPtrSet;
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/// Inliner - This class contains all of the helper code which is used to
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/// perform the inlining operations that do not depend on the policy.
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///
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struct Inliner : public CallGraphSCCPass {
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explicit Inliner(void *ID);
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explicit Inliner(void *ID, int Threshold);
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/// getAnalysisUsage - For this class, we declare that we require and preserve
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/// the call graph. If the derived class implements this method, it should
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/// always explicitly call the implementation here.
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virtual void getAnalysisUsage(AnalysisUsage &Info) const;
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// Main run interface method, this implements the interface required by the
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// Pass class.
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virtual bool runOnSCC(std::vector<CallGraphNode *> &SCC);
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// doFinalization - Remove now-dead linkonce functions at the end of
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// processing to avoid breaking the SCC traversal.
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virtual bool doFinalization(CallGraph &CG);
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/// This method returns the value specified by the -inline-threshold value,
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/// specified on the command line. This is typically not directly needed.
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///
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unsigned getInlineThreshold() const { return InlineThreshold; }
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/// getInlineCost - This method must be implemented by the subclass to
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/// determine the cost of inlining the specified call site. If the cost
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/// returned is greater than the current inline threshold, the call site is
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/// not inlined.
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///
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virtual InlineCost getInlineCost(CallSite CS) = 0;
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// getInlineFudgeFactor - Return a > 1.0 factor if the inliner should use a
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// higher threshold to determine if the function call should be inlined.
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///
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virtual float getInlineFudgeFactor(CallSite CS) = 0;
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/// resetCachedCostInfo - erase any cached cost data from the derived class.
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/// If the derived class has no such data this can be empty.
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///
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virtual void resetCachedCostInfo(Function* Caller) = 0;
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/// removeDeadFunctions - Remove dead functions that are not included in
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/// DNR (Do Not Remove) list.
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bool removeDeadFunctions(CallGraph &CG,
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SmallPtrSet<const Function *, 16> *DNR = NULL);
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private:
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// InlineThreshold - Cache the value here for easy access.
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unsigned InlineThreshold;
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/// shouldInline - Return true if the inliner should attempt to
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/// inline at the given CallSite.
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bool shouldInline(CallSite CS);
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};
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} // End llvm namespace
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#endif
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