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54fec07ec0
CallGraph. This makes the CallGraph a totally generic analysis object that is the container for the graph data structure and the primary interface for querying and manipulating it. The pass logic is separated into its own class. For compatibility reasons, the pass provides wrapper methods for most of the methods on CallGraph -- they all just forward. This will allow the new pass manager infrastructure to provide its own analysis pass that constructs the same CallGraph object and makes it available. The idea is that in the new pass manager, the analysis pass's 'run' method returns a concrete analysis 'result'. Here, that result is a 'CallGraph'. The 'run' method will typically do only minimal work, deferring much of the work into the implementation of the result object in order to be lazy about computing things, but when (like DomTree) there is *some* up-front computation, the analysis does it prior to handing the result back to the querying pass. I know some of this is fairly ugly. I'm happy to change it around if folks can suggest a cleaner interim state, but there is going to be some amount of unavoidable ugliness during the transition period. The good thing is that this is very limited and will naturally go away when the old pass infrastructure goes away. It won't hang around to bother us later. Next up is the initial new-PM-style call graph analysis. =] git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195722 91177308-0d34-0410-b5e6-96231b3b80d8
113 lines
3.8 KiB
C++
113 lines
3.8 KiB
C++
//===- InlineAlways.cpp - Code to inline always_inline functions ----------===//
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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 implements a custom inliner that handles only functions that
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// are marked as "always inline".
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "inline"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/Analysis/CallGraph.h"
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#include "llvm/Analysis/InlineCost.h"
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#include "llvm/IR/CallingConv.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/Transforms/IPO/InlinerPass.h"
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using namespace llvm;
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namespace {
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/// \brief Inliner pass which only handles "always inline" functions.
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class AlwaysInliner : public Inliner {
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InlineCostAnalysis *ICA;
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public:
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// Use extremely low threshold.
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AlwaysInliner() : Inliner(ID, -2000000000, /*InsertLifetime*/ true), ICA(0) {
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initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
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}
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AlwaysInliner(bool InsertLifetime)
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: Inliner(ID, -2000000000, InsertLifetime), ICA(0) {
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initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
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}
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static char ID; // Pass identification, replacement for typeid
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virtual InlineCost getInlineCost(CallSite CS);
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virtual void getAnalysisUsage(AnalysisUsage &AU) const;
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virtual bool runOnSCC(CallGraphSCC &SCC);
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using llvm::Pass::doFinalization;
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virtual bool doFinalization(CallGraph &CG) {
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return removeDeadFunctions(CG, /*AlwaysInlineOnly=*/ true);
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}
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};
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}
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char AlwaysInliner::ID = 0;
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INITIALIZE_PASS_BEGIN(AlwaysInliner, "always-inline",
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"Inliner for always_inline functions", false, false)
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INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
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INITIALIZE_PASS_DEPENDENCY(InlineCostAnalysis)
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INITIALIZE_PASS_END(AlwaysInliner, "always-inline",
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"Inliner for always_inline functions", false, false)
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Pass *llvm::createAlwaysInlinerPass() { return new AlwaysInliner(); }
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Pass *llvm::createAlwaysInlinerPass(bool InsertLifetime) {
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return new AlwaysInliner(InsertLifetime);
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}
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/// \brief Get the inline cost for the always-inliner.
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///
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/// The always inliner *only* handles functions which are marked with the
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/// attribute to force inlining. As such, it is dramatically simpler and avoids
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/// using the powerful (but expensive) inline cost analysis. Instead it uses
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/// a very simple and boring direct walk of the instructions looking for
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/// impossible-to-inline constructs.
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///
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/// Note, it would be possible to go to some lengths to cache the information
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/// computed here, but as we only expect to do this for relatively few and
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/// small functions which have the explicit attribute to force inlining, it is
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/// likely not worth it in practice.
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InlineCost AlwaysInliner::getInlineCost(CallSite CS) {
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Function *Callee = CS.getCalledFunction();
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// Only inline direct calls to functions with always-inline attributes
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// that are viable for inlining. FIXME: We shouldn't even get here for
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// declarations.
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if (Callee && !Callee->isDeclaration() &&
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Callee->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
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Attribute::AlwaysInline) &&
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ICA->isInlineViable(*Callee))
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return InlineCost::getAlways();
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return InlineCost::getNever();
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}
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bool AlwaysInliner::runOnSCC(CallGraphSCC &SCC) {
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ICA = &getAnalysis<InlineCostAnalysis>();
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return Inliner::runOnSCC(SCC);
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}
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void AlwaysInliner::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<InlineCostAnalysis>();
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Inliner::getAnalysisUsage(AU);
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}
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