//
//===----------------------------------------------------------------------===//
-#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/Support/CallSite.h"
-#include "llvm/Support/Compiler.h"
#include "llvm/Transforms/IPO.h"
-#include "llvm/Transforms/IPO/InlinerPass.h"
-#include "llvm/Transforms/Utils/InlineCost.h"
#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/AssumptionCache.h"
+#include "llvm/Analysis/CallGraph.h"
+#include "llvm/Analysis/InlineCost.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"
using namespace llvm;
+#define DEBUG_TYPE "inline"
+
namespace {
- // AlwaysInliner only inlines functions that are mark as "always inline".
- class VISIBILITY_HIDDEN AlwaysInliner : public Inliner {
- // Functions that are never inlined
- SmallPtrSet<const Function*, 16> NeverInline;
- InlineCostAnalyzer CA;
- public:
- // Use extremely low threshold.
- AlwaysInliner() : Inliner(&ID, -2000000000) {}
- static char ID; // Pass identification, replacement for typeid
- int getInlineCost(CallSite CS) {
- return CA.getInlineCost(CS, NeverInline);
- }
- float getInlineFudgeFactor(CallSite CS) {
- return CA.getInlineFudgeFactor(CS);
- }
- 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;
-static RegisterPass<AlwaysInliner>
-X("always-inline", "Inliner that handles always_inline functions");
+INITIALIZE_PASS_BEGIN(AlwaysInliner, "always-inline",
+ "Inliner for always_inline functions", false, false)
+INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
+INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
+INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
+INITIALIZE_PASS_DEPENDENCY(InlineCostAnalysis)
+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) {
-
- Module &M = CG.getModule();
-
- for (Module::iterator I = M.begin(), E = M.end();
- I != E; ++I)
- if (!I->isDeclaration() && !I->hasNote(FnAttr::AlwaysInline))
- NeverInline.insert(I);
-
- return false;
+Pass *llvm::createAlwaysInlinerPass(bool InsertLifetime) {
+ return new AlwaysInliner(InsertLifetime);
+}
+
+/// \brief Get the inline cost for the always-inliner.
+///
+/// The always inliner *only* handles functions which are marked with the
+/// attribute to force inlining. As such, it is dramatically simpler and avoids
+/// using the powerful (but expensive) inline cost analysis. Instead it uses
+/// a very simple and boring direct walk of the instructions looking for
+/// impossible-to-inline constructs.
+///
+/// Note, it would be possible to go to some lengths to cache the information
+/// computed here, but as we only expect to do this for relatively few and
+/// small functions which have the explicit attribute to force inlining, it is
+/// likely not worth it in practice.
+InlineCost AlwaysInliner::getInlineCost(CallSite CS) {
+ Function *Callee = CS.getCalledFunction();
+
+ // 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 InlineCost::getNever();
}
+bool AlwaysInliner::runOnSCC(CallGraphSCC &SCC) {
+ ICA = &getAnalysis<InlineCostAnalysis>();
+ return Inliner::runOnSCC(SCC);
+}
+
+void AlwaysInliner::getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequired<InlineCostAnalysis>();
+ Inliner::getAnalysisUsage(AU);
+}