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775cbdd51a
Now we collect all of the call sites we are interested in inlining, then inline them. This entirely avoids issues with trying to inline a call site we got by inlining another call site. This also eliminates iterator invalidation issues. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12770 91177308-0d34-0410-b5e6-96231b3b80d8
125 lines
4.8 KiB
C++
125 lines
4.8 KiB
C++
//===- InlineCommon.cpp - Code common to all inliners ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the code shared between the LLVM inliners. This
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// implements all of the boring mechanics of the bottom-up inlining.
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//
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//===----------------------------------------------------------------------===//
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#include "Inliner.h"
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#include "llvm/Constants.h" // ConstantPointerRef should die
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#include "llvm/Module.h"
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#include "llvm/iOther.h"
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#include "llvm/iTerminators.h"
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#include "llvm/Analysis/CallGraph.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/Transforms/Utils/Cloning.h"
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#include "Support/CommandLine.h"
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#include "Support/Debug.h"
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#include "Support/Statistic.h"
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using namespace llvm;
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namespace {
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Statistic<> NumInlined("inline", "Number of functions inlined");
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Statistic<> NumDeleted("inline", "Number of functions deleted because all callers found");
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cl::opt<unsigned> // FIXME: 200 is VERY conservative
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InlineLimit("inline-threshold", cl::Hidden, cl::init(200),
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cl::desc("Control the amount of inlining to perform (default = 200)"));
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}
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Inliner::Inliner() : InlineThreshold(InlineLimit) {}
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int Inliner::getRecursiveInlineCost(CallSite CS) {
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return getInlineCost(CS);
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}
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bool Inliner::runOnSCC(const std::vector<CallGraphNode*> &SCC) {
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CallGraph &CG = getAnalysis<CallGraph>();
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std::set<Function*> SCCFunctions;
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DEBUG(std::cerr << "Inliner visiting SCC:");
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for (unsigned i = 0, e = SCC.size(); i != e; ++i) {
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SCCFunctions.insert(SCC[i]->getFunction());
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DEBUG(std::cerr << " " << (SCC[i]->getFunction() ?
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SCC[i]->getFunction()->getName() : "INDIRECTNODE"));
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}
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DEBUG(std::cerr << "\n");
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bool Changed = false;
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for (std::set<Function*>::iterator SCCI = SCCFunctions.begin(),
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E = SCCFunctions.end(); SCCI != E; ++SCCI) {
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Function *F = *SCCI;
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if (F == 0 || F->isExternal()) continue;
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DEBUG(std::cerr << " Inspecting function: " << F->getName() << "\n");
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// Scan through and identify all call sites ahead of time so that we only
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// inline call sites in the original functions, not call sites that result
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// in inlining other functions.
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std::vector<CallSite> CallSites;
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
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for (BasicBlock::iterator I = BB->begin(); I != BB->end(); ++I) {
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CallSite CS = CallSite::get(I);
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if (CS.getInstruction() && CS.getCalledFunction() &&
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!CS.getCalledFunction()->isExternal())
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CallSites.push_back(CS);
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}
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// Now that we have all of the call sites, loop over them and inline them if
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// it looks profitable to do so.
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for (unsigned i = 0, e = CallSites.size(); i != e; ++i) {
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CallSite CS = CallSites[i];
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Function *Callee = CS.getCalledFunction();
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// Determine whether this is a function IN the SCC...
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bool inSCC = SCCFunctions.count(Callee);
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// If the policy determines that we should inline this function,
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// try to do so...
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int InlineCost = inSCC ? getRecursiveInlineCost(CS) : getInlineCost(CS);
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if (InlineCost >= (int)InlineThreshold) {
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DEBUG(std::cerr << " NOT Inlining: cost=" << InlineCost
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<< ", Call: " << *CS.getInstruction());
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} else {
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DEBUG(std::cerr << " Inlining: cost=" << InlineCost
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<< ", Call: " << *CS.getInstruction());
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Function *Caller = CS.getInstruction()->getParent()->getParent();
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// Attempt to inline the function...
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if (InlineFunction(CS)) {
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++NumInlined;
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if (Callee->hasOneUse())
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if (ConstantPointerRef *CPR =
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dyn_cast<ConstantPointerRef>(Callee->use_back()))
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if (CPR->use_empty())
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CPR->destroyConstant();
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// If we inlined the last possible call site to the function,
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// delete the function body now.
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if (Callee->use_empty() && Callee != Caller &&
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(Callee->hasInternalLinkage() || Callee->hasLinkOnceLinkage())) {
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DEBUG(std::cerr << " -> Deleting dead function: "
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<< (void*)Callee << Callee->getName() << "\n");
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std::set<Function*>::iterator I = SCCFunctions.find(Callee);
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if (I != SCCFunctions.end()) // Remove function from this SCC.
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SCCFunctions.erase(I);
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Callee->getParent()->getFunctionList().erase(Callee);
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++NumDeleted;
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}
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Changed = true;
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}
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}
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}
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}
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return Changed;
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}
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