//
//===----------------------------------------------------------------------===//
-#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/Transforms/IPO.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/AssumptionTracker.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Analysis/InlineCost.h"
-#include "llvm/Support/CallSite.h"
-#include "llvm/Transforms/IPO.h"
+#include "llvm/IR/CallSite.h"
+#include "llvm/IR/CallingConv.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/Type.h"
#include "llvm/Transforms/IPO/InlinerPass.h"
-#include "llvm/DataLayout.h"
-#include "llvm/ADT/SmallPtrSet.h"
using namespace llvm;
+#define DEBUG_TYPE "inline"
+
namespace {
- // AlwaysInliner only inlines functions that are mark as "always inline".
- class AlwaysInliner : public Inliner {
- 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
- virtual InlineCost getInlineCost(CallSite CS);
- virtual bool doFinalization(CallGraph &CG) {
- return removeDeadFunctions(CG, /*AlwaysInlineOnly=*/true);
- }
- virtual bool doInitialization(CallGraph &CG);
- };
+/// \brief Inliner pass which only handles "always inline" functions.
+class AlwaysInliner : public Inliner {
+ InlineCostAnalysis *ICA;
+
+public:
+ // Use extremely low threshold.
+ AlwaysInliner() : Inliner(ID, -2000000000, /*InsertLifetime*/ true),
+ ICA(nullptr) {
+ initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
+ }
+
+ AlwaysInliner(bool InsertLifetime)
+ : Inliner(ID, -2000000000, InsertLifetime), ICA(nullptr) {
+ initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
+ }
+
+ static char ID; // Pass identification, replacement for typeid
+
+ InlineCost getInlineCost(CallSite CS) override;
+
+ void getAnalysisUsage(AnalysisUsage &AU) const override;
+ bool runOnSCC(CallGraphSCC &SCC) override;
+
+ using llvm::Pass::doFinalization;
+ bool doFinalization(CallGraph &CG) override {
+ return removeDeadFunctions(CG, /*AlwaysInlineOnly=*/ true);
+ }
+};
+
}
char AlwaysInliner::ID = 0;
INITIALIZE_PASS_BEGIN(AlwaysInliner, "always-inline",
"Inliner for always_inline functions", false, false)
-INITIALIZE_AG_DEPENDENCY(CallGraph)
+INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
+INITIALIZE_PASS_DEPENDENCY(AssumptionTracker)
+INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
+INITIALIZE_PASS_DEPENDENCY(InlineCostAnalysis)
INITIALIZE_PASS_END(AlwaysInliner, "always-inline",
"Inliner for always_inline functions", false, false)
return new AlwaysInliner(InsertLifetime);
}
-/// \brief Minimal filter to detect invalid constructs for inlining.
-static bool isInlineViable(Function &F) {
- bool ReturnsTwice = F.getFnAttributes().hasReturnsTwiceAttr();
- 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();
+ // 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() &&
+ CS.hasFnAttr(Attribute::AlwaysInline) &&
+ ICA->isInlineViable(*Callee))
+ return InlineCost::getAlways();
- // Return never for anything not marked as always inline.
- if (!Callee->getFnAttributes().hasAlwaysInlineAttr())
- return InlineCost::getNever();
-
- // Do some minimal analysis to preclude non-viable functions.
- if (!isInlineViable(*Callee))
- return InlineCost::getNever();
+ return InlineCost::getNever();
+}
- // Otherwise, force inlining.
- return InlineCost::getAlways();
+bool AlwaysInliner::runOnSCC(CallGraphSCC &SCC) {
+ ICA = &getAnalysis<InlineCostAnalysis>();
+ return Inliner::runOnSCC(SCC);
}
-// doInitialization - Initializes the vector of functions that have not
-// been annotated with the "always inline" attribute.
-bool AlwaysInliner::doInitialization(CallGraph &CG) {
- return false;
+void AlwaysInliner::getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequired<InlineCostAnalysis>();
+ Inliner::getAnalysisUsage(AU);
}