1 //===- InlineAlways.cpp - Code to inline always_inline functions ----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements a custom inliner that handles only functions that
11 // are marked as "always inline".
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "inline"
16 #include "llvm/CallingConv.h"
17 #include "llvm/Instructions.h"
18 #include "llvm/IntrinsicInst.h"
19 #include "llvm/Module.h"
20 #include "llvm/Type.h"
21 #include "llvm/Analysis/CallGraph.h"
22 #include "llvm/Analysis/InlineCost.h"
23 #include "llvm/Support/CallSite.h"
24 #include "llvm/Transforms/IPO.h"
25 #include "llvm/Transforms/IPO/InlinerPass.h"
26 #include "llvm/Target/TargetData.h"
27 #include "llvm/ADT/SmallPtrSet.h"
33 // AlwaysInliner only inlines functions that are mark as "always inline".
34 class AlwaysInliner : public Inliner {
35 // Functions that are never inlined
36 SmallPtrSet<const Function*, 16> NeverInline;
37 InlineCostAnalyzer CA;
39 // Use extremely low threshold.
40 AlwaysInliner() : Inliner(ID, -2000000000, true) {
41 initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
43 AlwaysInliner(bool InsertLifetime) : Inliner(ID, -2000000000,
45 initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
47 static char ID; // Pass identification, replacement for typeid
48 InlineCost getInlineCost(CallSite CS) {
49 return CA.getInlineCost(CS, NeverInline);
51 float getInlineFudgeFactor(CallSite CS) {
52 return CA.getInlineFudgeFactor(CS);
54 void resetCachedCostInfo(Function *Caller) {
55 CA.resetCachedCostInfo(Caller);
57 void growCachedCostInfo(Function* Caller, Function* Callee) {
58 CA.growCachedCostInfo(Caller, Callee);
60 virtual bool doFinalization(CallGraph &CG) {
61 return removeDeadFunctions(CG, &NeverInline);
63 virtual bool doInitialization(CallGraph &CG);
64 void releaseMemory() {
70 char AlwaysInliner::ID = 0;
71 INITIALIZE_PASS_BEGIN(AlwaysInliner, "always-inline",
72 "Inliner for always_inline functions", false, false)
73 INITIALIZE_AG_DEPENDENCY(CallGraph)
74 INITIALIZE_PASS_END(AlwaysInliner, "always-inline",
75 "Inliner for always_inline functions", false, false)
77 Pass *llvm::createAlwaysInlinerPass() { return new AlwaysInliner(); }
79 Pass *llvm::createAlwaysInlinerPass(bool InsertLifetime) {
80 return new AlwaysInliner(InsertLifetime);
83 // doInitialization - Initializes the vector of functions that have not
84 // been annotated with the "always inline" attribute.
85 bool AlwaysInliner::doInitialization(CallGraph &CG) {
86 CA.setTargetData(getAnalysisIfAvailable<TargetData>());
88 Module &M = CG.getModule();
90 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
91 if (!I->isDeclaration() && !I->hasFnAttr(Attribute::AlwaysInline))
92 NeverInline.insert(I);