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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 {
InlineCostAnalyzer CA;
public:
// Use extremely low threshold.
AlwaysInliner() : Inliner(ID, -2000000000, /*InsertLifetime*/true) {
initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
}
AlwaysInliner(bool InsertLifetime) : Inliner(ID, -2000000000,
InsertLifetime) {
initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
}
static char ID; // Pass identification, replacement for typeid
InlineCost getInlineCost(CallSite CS) {
Function *Callee = CS.getCalledFunction();
// We assume indirect calls aren't calling an always-inline function.
if (!Callee) return InlineCost::getNever();
// We can't inline calls to external functions.
// FIXME: We shouldn't even get here.
if (Callee->isDeclaration()) return InlineCost::getNever();
// Return never for anything not marked as always inline.
if (!Callee->hasFnAttr(Attribute::AlwaysInline))
return InlineCost::getNever();
// We still have to check the inline cost in case there are reasons to
// not inline which trump the always-inline attribute such as setjmp and
// indirectbr.
return CA.getInlineCost(CS, getInlineThreshold(CS));
}
virtual bool doFinalization(CallGraph &CG) {
return removeDeadFunctions(CG, /*AlwaysInlineOnly=*/true);
}
virtual bool doInitialization(CallGraph &CG);
};
}
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(); }
Pass *llvm::createAlwaysInlinerPass(bool InsertLifetime) {
return new AlwaysInliner(InsertLifetime);
}
// 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>());
return false;
}
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