1 // llvm/Transforms/IPO/PassManagerBuilder.h - Build Standard Pass -*- C++ -*-=// 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 defines the PassManagerBuilder class, which is used to set up a 11 // "standard" optimization sequence suitable for languages like C and C++. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_SUPPORT_PASSMANAGERBUILDER_H 16 #define LLVM_SUPPORT_PASSMANAGERBUILDER_H 17 18 #include <vector> 19 20 namespace llvm { 21 class TargetLibraryInfo; 22 class PassManagerBase; 23 class Pass; 24 class FunctionPassManager; 25 26 /// PassManagerBuilder - This class is used to set up a standard optimization 27 /// sequence for languages like C and C++, allowing some APIs to customize the 28 /// pass sequence in various ways. A simple example of using it would be: 29 /// 30 /// PassManagerBuilder Builder; 31 /// Builder.OptLevel = 2; 32 /// Builder.populateFunctionPassManager(FPM); 33 /// Builder.populateModulePassManager(MPM); 34 /// 35 /// In addition to setting up the basic passes, PassManagerBuilder allows 36 /// frontends to vend a plugin API, where plugins are allowed to add extensions 37 /// to the default pass manager. They do this by specifying where in the pass 38 /// pipeline they want to be added, along with a callback function that adds 39 /// the pass(es). For example, a plugin that wanted to add a loop optimization 40 /// could do something like this: 41 /// 42 /// static void addMyLoopPass(const PMBuilder &Builder, PassManagerBase &PM) { 43 /// if (Builder.getOptLevel() > 2 && Builder.getOptSizeLevel() == 0) 44 /// PM.add(createMyAwesomePass()); 45 /// } 46 /// ... 47 /// Builder.addExtension(PassManagerBuilder::EP_LoopOptimizerEnd, 48 /// addMyLoopPass); 49 /// ... 50 class PassManagerBuilder { 51 public: 52 53 /// Extensions are passed the builder itself (so they can see how it is 54 /// configured) as well as the pass manager to add stuff to. 55 typedef void (*ExtensionFn)(const PassManagerBuilder &Builder, 56 PassManagerBase &PM); 57 enum ExtensionPointTy { 58 /// EP_EarlyAsPossible - This extension point allows adding passes before 59 /// any other transformations, allowing them to see the code as it is coming 60 /// out of the frontend. 61 EP_EarlyAsPossible, 62 63 /// EP_LoopOptimizerEnd - This extension point allows adding loop passes to 64 /// the end of the loop optimizer. 65 EP_LoopOptimizerEnd, 66 67 /// EP_ScalarOptimizerLate - This extension point allows adding optimization 68 /// passes after most of the main optimizations, but before the last 69 /// cleanup-ish optimizations. 70 EP_ScalarOptimizerLate 71 }; 72 73 /// The Optimization Level - Specify the basic optimization level. 74 /// 0 = -O0, 1 = -O1, 2 = -O2, 3 = -O3 75 unsigned OptLevel; 76 77 /// SizeLevel - How much we're optimizing for size. 78 /// 0 = none, 1 = -Os, 2 = -Oz 79 unsigned SizeLevel; 80 81 /// LibraryInfo - Specifies information about the runtime library for the 82 /// optimizer. If this is non-null, it is added to both the function and 83 /// per-module pass pipeline. 84 TargetLibraryInfo *LibraryInfo; 85 86 /// Inliner - Specifies the inliner to use. If this is non-null, it is 87 /// added to the per-module passes. 88 Pass *Inliner; 89 90 bool DisableSimplifyLibCalls; 91 bool DisableUnitAtATime; 92 bool DisableUnrollLoops; 93 94 private: 95 /// ExtensionList - This is list of all of the extensions that are registered. 96 std::vector<std::pair<ExtensionPointTy, ExtensionFn> > Extensions; 97 98 public: 99 PassManagerBuilder(); 100 ~PassManagerBuilder(); 101 /// Adds an extension that will be used by all PassManagerBuilder instances. 102 /// This is intended to be used by plugins, to register a set of 103 /// optimisations to run automatically. 104 static void addGlobalExtension(ExtensionPointTy Ty, ExtensionFn Fn); 105 void addExtension(ExtensionPointTy Ty, ExtensionFn Fn); 106 107 private: 108 void addExtensionsToPM(ExtensionPointTy ETy, PassManagerBase &PM) const; 109 void addInitialAliasAnalysisPasses(PassManagerBase &PM) const; 110 public: 111 112 /// populateFunctionPassManager - This fills in the function pass manager, 113 /// which is expected to be run on each function immediately as it is 114 /// generated. The idea is to reduce the size of the IR in memory. 115 void populateFunctionPassManager(FunctionPassManager &FPM); 116 117 /// populateModulePassManager - This sets up the primary pass manager. 118 void populateModulePassManager(PassManagerBase &MPM); 119 void populateLTOPassManager(PassManagerBase &PM, bool Internalize, 120 bool RunInliner); 121 }; 122 /// Registers a function for adding a standard set of passes. This should be 123 /// used by optimizer plugins to allow all front ends to transparently use 124 /// them. Create a static instance of this class in your plugin, providing a 125 /// private function that the PassManagerBuilder can use to add your passes. 126 struct RegisterStandardPasses { 127 RegisterStandardPasses(PassManagerBuilder::ExtensionPointTy Ty, 128 PassManagerBuilder::ExtensionFn Fn) { 129 PassManagerBuilder::addGlobalExtension(Ty, Fn); 130 } 131 }; 132 } // end namespace llvm 133 #endif 134
