//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "inline"
+#include "llvm/Transforms/IPO.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/Analysis/CallGraph.h"
+#include "llvm/Analysis/InlineCost.h"
#include "llvm/CallingConv.h"
+#include "llvm/DataLayout.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"
+#include "llvm/Type.h"
using namespace llvm;
// 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) {
}
static char ID; // Pass identification, replacement for typeid
virtual InlineCost getInlineCost(CallSite CS);
+
+ using llvm::Pass::doInitialization;
+ using llvm::Pass::doFinalization;
+
virtual bool doFinalization(CallGraph &CG) {
return removeDeadFunctions(CG, /*AlwaysInlineOnly=*/true);
}
return new AlwaysInliner(InsertLifetime);
}
-/// \brief Minimal filter to detect invalid constructs for inlining.
-static bool isInlineViable(Function &F) {
- bool ReturnsTwice = F.hasFnAttr(Attribute::ReturnsTwice);
- for (Function::iterator BI = F.begin(), BE = F.end(); BI != BE; ++BI) {
- // Disallow inlining of functions which contain an indirect branch.
- if (isa<IndirectBrInst>(BI->getTerminator()))
- return false;
-
- for (BasicBlock::iterator II = BI->begin(), IE = BI->end(); II != IE;
- ++II) {
- CallSite CS(II);
- if (!CS)
- continue;
-
- // Disallow recursive calls.
- if (&F == CS.getCalledFunction())
- return false;
-
- // Disallow calls which expose returns-twice to a function not previously
- // attributed as such.
- if (!ReturnsTwice && CS.isCall() &&
- cast<CallInst>(CS.getInstruction())->canReturnTwice())
- return false;
- }
- }
-
- return true;
-}
-
/// \brief Get the inline cost for the always-inliner.
///
/// The always inliner *only* handles functions which are marked with the
/// likely not worth it in practice.
InlineCost AlwaysInliner::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();
- // Do some minimal analysis to preclude non-viable functions.
- if (!isInlineViable(*Callee))
- return InlineCost::getNever();
+ // Only inline direct calls to functions with always-inline attributes
+ // that are viable for inlining. FIXME: We shouldn't even get here for
+ // declarations.
+ if (Callee && !Callee->isDeclaration() &&
+ Callee->getFnAttributes().hasAttribute(Attributes::AlwaysInline) &&
+ CA.isInlineViable(*Callee))
+ return InlineCost::getAlways();
- // Otherwise, force inlining.
- return InlineCost::getAlways();
+ return InlineCost::getNever();
}
// doInitialization - Initializes the vector of functions that have not
// been annotated with the "always inline" attribute.
bool AlwaysInliner::doInitialization(CallGraph &CG) {
+ CA.setDataLayout(getAnalysisIfAvailable<DataLayout>());
return false;
}