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//===- InlineAlways.cpp - Code to inline always_inline functions ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements a custom inliner that handles only functions that
// are marked as "always inline".
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "inline"
#include "llvm/CallingConv.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Analysis/InlineCost.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/IPO/InlinerPass.h"
#include "llvm/Target/TargetData.h"
#include "llvm/ADT/SmallPtrSet.h"
using namespace llvm;
namespace {
// AlwaysInliner only inlines functions that are mark as "always inline".
class AlwaysInliner : public Inliner {
// Functions that are never inlined
SmallPtrSet<const Function*, 16> NeverInline;
InlineCostAnalyzer CA;
public:
// Use extremely low threshold.
AlwaysInliner() : Inliner(ID, -2000000000) {
initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
}
static char ID; // Pass identification, replacement for typeid
InlineCost getInlineCost(CallSite CS) {
return CA.getInlineCost(CS, NeverInline);
}
float getInlineFudgeFactor(CallSite CS) {
return CA.getInlineFudgeFactor(CS);
}
void resetCachedCostInfo(Function *Caller) {
CA.resetCachedCostInfo(Caller);
}
void growCachedCostInfo(Function* Caller, Function* Callee) {
CA.growCachedCostInfo(Caller, Callee);
}
virtual bool doFinalization(CallGraph &CG) {
return removeDeadFunctions(CG, &NeverInline);
}
virtual bool doInitialization(CallGraph &CG);
void releaseMemory() {
CA.clear();
}
};
}
char AlwaysInliner::ID = 0;
INITIALIZE_PASS_BEGIN(AlwaysInliner, "always-inline",
"Inliner for always_inline functions", false, false)
INITIALIZE_AG_DEPENDENCY(CallGraph)
INITIALIZE_PASS_END(AlwaysInliner, "always-inline",
"Inliner for always_inline functions", false, false)
Pass *llvm::createAlwaysInlinerPass() { return new AlwaysInliner(); }
// doInitialization - Initializes the vector of functions that have not
// been annotated with the "always inline" attribute.
bool AlwaysInliner::doInitialization(CallGraph &CG) {
CA.setTargetData(getAnalysisIfAvailable<TargetData>());
Module &M = CG.getModule();
for (Module::iterator I = M.begin(), E = M.end();
I != E; ++I)
if (!I->isDeclaration() && !I->hasFnAttr(Attribute::AlwaysInline))
NeverInline.insert(I);
return false;
}
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