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45de584b4f
interfaces. These methods were used in the old inline cost system where there was a persistent cache that had to be updated, invalidated, and cleared. We're now doing more direct computations that don't require this intricate dance. Even if we resume some level of caching, it would almost certainly have a simpler and more narrow interface than this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153813 91177308-0d34-0410-b5e6-96231b3b80d8
90 lines
3.2 KiB
C++
90 lines
3.2 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/CallingConv.h"
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#include "llvm/Instructions.h"
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#include "llvm/IntrinsicInst.h"
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#include "llvm/Module.h"
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#include "llvm/Type.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/Support/CallSite.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/IPO/InlinerPass.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/ADT/SmallPtrSet.h"
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using namespace llvm;
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namespace {
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// AlwaysInliner only inlines functions that are mark as "always inline".
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class AlwaysInliner : public Inliner {
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InlineCostAnalyzer CA;
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public:
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// Use extremely low threshold.
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AlwaysInliner() : Inliner(ID, -2000000000, /*InsertLifetime*/true) {
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initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
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}
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AlwaysInliner(bool InsertLifetime) : Inliner(ID, -2000000000,
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InsertLifetime) {
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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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InlineCost getInlineCost(CallSite CS) {
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Function *Callee = CS.getCalledFunction();
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// We assume indirect calls aren't calling an always-inline function.
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if (!Callee) return InlineCost::getNever();
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// We can't inline calls to external functions.
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// FIXME: We shouldn't even get here.
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if (Callee->isDeclaration()) return InlineCost::getNever();
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// Return never for anything not marked as always inline.
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if (!Callee->hasFnAttr(Attribute::AlwaysInline))
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return InlineCost::getNever();
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// We still have to check the inline cost in case there are reasons to
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// not inline which trump the always-inline attribute such as setjmp and
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// indirectbr.
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return CA.getInlineCost(CS, getInlineThreshold(CS));
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}
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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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virtual bool doInitialization(CallGraph &CG);
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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_AG_DEPENDENCY(CallGraph)
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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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// doInitialization - Initializes the vector of functions that have not
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// been annotated with the "always inline" attribute.
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bool AlwaysInliner::doInitialization(CallGraph &CG) {
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CA.setTargetData(getAnalysisIfAvailable<TargetData>());
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return false;
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}
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