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
27 using namespace llvm;
28
29 namespace {
30
31 class SimpleInliner : public Inliner {
32 InlineCostAnalyzer CA;
33 public:
SimpleInliner()34 SimpleInliner() : Inliner(ID) {
35 initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
36 }
SimpleInliner(int Threshold)37 SimpleInliner(int Threshold) : Inliner(ID, Threshold,
38 /*InsertLifetime*/true) {
39 initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
40 }
41 static char ID; // Pass identification, replacement for typeid
getInlineCost(CallSite CS)42 InlineCost getInlineCost(CallSite CS) {
43 return CA.getInlineCost(CS, getInlineThreshold(CS));
44 }
45 virtual bool doInitialization(CallGraph &CG);
46 };
47 }
48
49 char SimpleInliner::ID = 0;
50 INITIALIZE_PASS_BEGIN(SimpleInliner, "inline",
51 "Function Integration/Inlining", false, false)
INITIALIZE_AG_DEPENDENCY(CallGraph)52 INITIALIZE_AG_DEPENDENCY(CallGraph)
53 INITIALIZE_PASS_END(SimpleInliner, "inline",
54 "Function Integration/Inlining", false, false)
55
56 Pass *llvm::createFunctionInliningPass() { return new SimpleInliner(); }
57
createFunctionInliningPass(int Threshold)58 Pass *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.
doInitialization(CallGraph & CG)64 bool SimpleInliner::doInitialization(CallGraph &CG) {
65 CA.setTargetData(getAnalysisIfAvailable<TargetData>());
66 return false;
67 }
68
69