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must be called in the pass's constructor. This function uses static dependency declarations to recursively initialize the pass's dependencies. Clients that only create passes through the createFooPass() APIs will require no changes. Clients that want to use the CommandLine options for passes will need to manually call the appropriate initialization functions in PassInitialization.h before parsing commandline arguments. I have tested this with all standard configurations of clang and llvm-gcc on Darwin. It is possible that there are problems with the static dependencies that will only be visible with non-standard options. If you encounter any crash in pass registration/creation, please send the testcase to me directly. llvm-svn: 116820
119 lines
3.5 KiB
C++
119 lines
3.5 KiB
C++
//===- InlineSimple.cpp - Code to perform simple function inlining --------===//
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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 bottom-up inlining of functions into callees.
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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/ADT/SmallPtrSet.h"
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using namespace llvm;
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namespace {
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class SimpleInliner : public Inliner {
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// Functions that are never inlined
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SmallPtrSet<const Function*, 16> NeverInline;
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InlineCostAnalyzer CA;
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public:
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SimpleInliner() : Inliner(ID) {
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initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
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}
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SimpleInliner(int Threshold) : Inliner(ID, Threshold) {
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initializeSimpleInlinerPass(*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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return CA.getInlineCost(CS, NeverInline);
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}
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float getInlineFudgeFactor(CallSite CS) {
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return CA.getInlineFudgeFactor(CS);
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}
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void resetCachedCostInfo(Function *Caller) {
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CA.resetCachedCostInfo(Caller);
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}
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void growCachedCostInfo(Function* Caller, Function* Callee) {
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CA.growCachedCostInfo(Caller, Callee);
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}
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virtual bool doInitialization(CallGraph &CG);
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void releaseMemory() {
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CA.clear();
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}
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};
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}
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char SimpleInliner::ID = 0;
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INITIALIZE_PASS_BEGIN(SimpleInliner, "inline",
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"Function Integration/Inlining", false, false)
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INITIALIZE_AG_DEPENDENCY(CallGraph)
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INITIALIZE_PASS_END(SimpleInliner, "inline",
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"Function Integration/Inlining", false, false)
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Pass *llvm::createFunctionInliningPass() { return new SimpleInliner(); }
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Pass *llvm::createFunctionInliningPass(int Threshold) {
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return new SimpleInliner(Threshold);
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}
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// doInitialization - Initializes the vector of functions that have been
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// annotated with the noinline attribute.
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bool SimpleInliner::doInitialization(CallGraph &CG) {
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Module &M = CG.getModule();
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for (Module::iterator I = M.begin(), E = M.end();
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I != E; ++I)
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if (!I->isDeclaration() && I->hasFnAttr(Attribute::NoInline))
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NeverInline.insert(I);
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// Get llvm.noinline
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GlobalVariable *GV = M.getNamedGlobal("llvm.noinline");
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if (GV == 0)
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return false;
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// Don't crash on invalid code
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if (!GV->hasDefinitiveInitializer())
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return false;
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const ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
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if (InitList == 0)
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return false;
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// Iterate over each element and add to the NeverInline set
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for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
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// Get Source
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const Constant *Elt = InitList->getOperand(i);
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if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(Elt))
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if (CE->getOpcode() == Instruction::BitCast)
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Elt = CE->getOperand(0);
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// Insert into set of functions to never inline
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if (const Function *F = dyn_cast<Function>(Elt))
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NeverInline.insert(F);
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}
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return false;
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}
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