1//===- InlineSimple.cpp - Code to perform simple function inlining --------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements bottom-up inlining of functions into callees.
11//
12//===----------------------------------------------------------------------===//
13
14#define DEBUG_TYPE "inline"
15#include "llvm/CallingConv.h"
16#include "llvm/Instructions.h"
17#include "llvm/IntrinsicInst.h"
18#include "llvm/Module.h"
19#include "llvm/Type.h"
20#include "llvm/Analysis/CallGraph.h"
21#include "llvm/Analysis/InlineCost.h"
22#include "llvm/Support/CallSite.h"
23#include "llvm/Transforms/IPO.h"
24#include "llvm/Transforms/IPO/InlinerPass.h"
25#include "llvm/Target/TargetData.h"
26
27using namespace llvm;
28
29namespace {
30
31  class SimpleInliner : public Inliner {
32    InlineCostAnalyzer CA;
33  public:
34    SimpleInliner() : Inliner(ID) {
35      initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
36    }
37    SimpleInliner(int Threshold) : Inliner(ID, Threshold,
38                                           /*InsertLifetime*/true) {
39      initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
40    }
41    static char ID; // Pass identification, replacement for typeid
42    InlineCost getInlineCost(CallSite CS) {
43      return CA.getInlineCost(CS, getInlineThreshold(CS));
44    }
45    virtual bool doInitialization(CallGraph &CG);
46  };
47}
48
49char SimpleInliner::ID = 0;
50INITIALIZE_PASS_BEGIN(SimpleInliner, "inline",
51                "Function Integration/Inlining", false, false)
52INITIALIZE_AG_DEPENDENCY(CallGraph)
53INITIALIZE_PASS_END(SimpleInliner, "inline",
54                "Function Integration/Inlining", false, false)
55
56Pass *llvm::createFunctionInliningPass() { return new SimpleInliner(); }
57
58Pass *llvm::createFunctionInliningPass(int Threshold) {
59  return new SimpleInliner(Threshold);
60}
61
62// doInitialization - Initializes the vector of functions that have been
63// annotated with the noinline attribute.
64bool SimpleInliner::doInitialization(CallGraph &CG) {
65  CA.setTargetData(getAnalysisIfAvailable<TargetData>());
66  return false;
67}
68
69