1 // llvm/Transforms/IPO/PassManagerBuilder.h - Build Standard Pass -*- C++ -*-=//
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 defines the PassManagerBuilder class, which is used to set up a
11 // "standard" optimization sequence suitable for languages like C and C++.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_TRANSFORMS_IPO_PASSMANAGERBUILDER_H
16 #define LLVM_TRANSFORMS_IPO_PASSMANAGERBUILDER_H
22 class TargetLibraryInfo;
25 // The old pass manager infrastructure is hidden in a legacy namespace now.
27 class FunctionPassManager;
28 class PassManagerBase;
30 using legacy::FunctionPassManager;
31 using legacy::PassManagerBase;
33 /// PassManagerBuilder - This class is used to set up a standard optimization
34 /// sequence for languages like C and C++, allowing some APIs to customize the
35 /// pass sequence in various ways. A simple example of using it would be:
37 /// PassManagerBuilder Builder;
38 /// Builder.OptLevel = 2;
39 /// Builder.populateFunctionPassManager(FPM);
40 /// Builder.populateModulePassManager(MPM);
42 /// In addition to setting up the basic passes, PassManagerBuilder allows
43 /// frontends to vend a plugin API, where plugins are allowed to add extensions
44 /// to the default pass manager. They do this by specifying where in the pass
45 /// pipeline they want to be added, along with a callback function that adds
46 /// the pass(es). For example, a plugin that wanted to add a loop optimization
47 /// could do something like this:
49 /// static void addMyLoopPass(const PMBuilder &Builder, PassManagerBase &PM) {
50 /// if (Builder.getOptLevel() > 2 && Builder.getOptSizeLevel() == 0)
51 /// PM.add(createMyAwesomePass());
54 /// Builder.addExtension(PassManagerBuilder::EP_LoopOptimizerEnd,
57 class PassManagerBuilder {
59 /// Extensions are passed the builder itself (so they can see how it is
60 /// configured) as well as the pass manager to add stuff to.
61 typedef void (*ExtensionFn)(const PassManagerBuilder &Builder,
63 enum ExtensionPointTy {
64 /// EP_EarlyAsPossible - This extension point allows adding passes before
65 /// any other transformations, allowing them to see the code as it is coming
66 /// out of the frontend.
69 /// EP_ModuleOptimizerEarly - This extension point allows adding passes
70 /// just before the main module-level optimization passes.
71 EP_ModuleOptimizerEarly,
73 /// EP_LoopOptimizerEnd - This extension point allows adding loop passes to
74 /// the end of the loop optimizer.
77 /// EP_ScalarOptimizerLate - This extension point allows adding optimization
78 /// passes after most of the main optimizations, but before the last
79 /// cleanup-ish optimizations.
80 EP_ScalarOptimizerLate,
82 /// EP_OptimizerLast -- This extension point allows adding passes that
83 /// run after everything else.
86 /// EP_EnabledOnOptLevel0 - This extension point allows adding passes that
87 /// should not be disabled by O0 optimization level. The passes will be
88 /// inserted after the inlining pass.
89 EP_EnabledOnOptLevel0,
91 /// EP_Peephole - This extension point allows adding passes that perform
92 /// peephole optimizations similar to the instruction combiner. These passes
93 /// will be inserted after each instance of the instruction combiner pass.
97 /// The Optimization Level - Specify the basic optimization level.
98 /// 0 = -O0, 1 = -O1, 2 = -O2, 3 = -O3
101 /// SizeLevel - How much we're optimizing for size.
102 /// 0 = none, 1 = -Os, 2 = -Oz
105 /// LibraryInfo - Specifies information about the runtime library for the
106 /// optimizer. If this is non-null, it is added to both the function and
107 /// per-module pass pipeline.
108 TargetLibraryInfo *LibraryInfo;
110 /// Inliner - Specifies the inliner to use. If this is non-null, it is
111 /// added to the per-module passes.
114 bool DisableTailCalls;
115 bool DisableUnitAtATime;
116 bool DisableUnrollLoops;
122 bool DisableGVNLoadPRE;
129 /// ExtensionList - This is list of all of the extensions that are registered.
130 std::vector<std::pair<ExtensionPointTy, ExtensionFn> > Extensions;
133 PassManagerBuilder();
134 ~PassManagerBuilder();
135 /// Adds an extension that will be used by all PassManagerBuilder instances.
136 /// This is intended to be used by plugins, to register a set of
137 /// optimisations to run automatically.
138 static void addGlobalExtension(ExtensionPointTy Ty, ExtensionFn Fn);
139 void addExtension(ExtensionPointTy Ty, ExtensionFn Fn);
142 void addExtensionsToPM(ExtensionPointTy ETy, PassManagerBase &PM) const;
143 void addInitialAliasAnalysisPasses(PassManagerBase &PM) const;
144 void addLTOOptimizationPasses(PassManagerBase &PM);
147 /// populateFunctionPassManager - This fills in the function pass manager,
148 /// which is expected to be run on each function immediately as it is
149 /// generated. The idea is to reduce the size of the IR in memory.
150 void populateFunctionPassManager(FunctionPassManager &FPM);
152 /// populateModulePassManager - This sets up the primary pass manager.
153 void populateModulePassManager(PassManagerBase &MPM);
154 void populateLTOPassManager(PassManagerBase &PM, TargetMachine *TM = nullptr);
157 /// Registers a function for adding a standard set of passes. This should be
158 /// used by optimizer plugins to allow all front ends to transparently use
159 /// them. Create a static instance of this class in your plugin, providing a
160 /// private function that the PassManagerBuilder can use to add your passes.
161 struct RegisterStandardPasses {
162 RegisterStandardPasses(PassManagerBuilder::ExtensionPointTy Ty,
163 PassManagerBuilder::ExtensionFn Fn) {
164 PassManagerBuilder::addGlobalExtension(Ty, Fn);
168 } // end namespace llvm