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_SUPPORT_PASSMANAGERBUILDER_H
16 #define LLVM_SUPPORT_PASSMANAGERBUILDER_H
21 class TargetLibraryInfo;
22 class PassManagerBase;
24 class FunctionPassManager;
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:
30 /// PassManagerBuilder Builder;
31 /// Builder.OptLevel = 2;
32 /// Builder.populateFunctionPassManager(FPM);
33 /// Builder.populateModulePassManager(MPM);
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:
42 /// static void addMyLoopPass(const PMBuilder &Builder, PassManagerBase &PM) {
43 /// if (Builder.getOptLevel() > 2 && Builder.getOptSizeLevel() == 0)
44 /// PM.add(createMyAwesomePass());
47 /// Builder.addExtension(PassManagerBuilder::EP_LoopOptimizerEnd,
50 class PassManagerBuilder {
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,
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.
63 /// EP_ModuleOptimizerEarly - This extension point allows adding passes
64 /// just before the main module-level optimization passes.
65 EP_ModuleOptimizerEarly,
67 /// EP_LoopOptimizerEnd - This extension point allows adding loop passes to
68 /// the end of the loop optimizer.
71 /// EP_ScalarOptimizerLate - This extension point allows adding optimization
72 /// passes after most of the main optimizations, but before the last
73 /// cleanup-ish optimizations.
74 EP_ScalarOptimizerLate,
76 /// EP_EnabledOnOptLevel0 - This extension point allows adding passes that
77 /// should not be disabled by O0 optimization level. The passes will be
78 /// inserted after the inlining pass.
82 /// The Optimization Level - Specify the basic optimization level.
83 /// 0 = -O0, 1 = -O1, 2 = -O2, 3 = -O3
86 /// SizeLevel - How much we're optimizing for size.
87 /// 0 = none, 1 = -Os, 2 = -Oz
90 /// LibraryInfo - Specifies information about the runtime library for the
91 /// optimizer. If this is non-null, it is added to both the function and
92 /// per-module pass pipeline.
93 TargetLibraryInfo *LibraryInfo;
95 /// Inliner - Specifies the inliner to use. If this is non-null, it is
96 /// added to the per-module passes.
99 bool DisableSimplifyLibCalls;
100 bool DisableUnitAtATime;
101 bool DisableUnrollLoops;
105 /// ExtensionList - This is list of all of the extensions that are registered.
106 std::vector<std::pair<ExtensionPointTy, ExtensionFn> > Extensions;
109 PassManagerBuilder();
110 ~PassManagerBuilder();
111 /// Adds an extension that will be used by all PassManagerBuilder instances.
112 /// This is intended to be used by plugins, to register a set of
113 /// optimisations to run automatically.
114 static void addGlobalExtension(ExtensionPointTy Ty, ExtensionFn Fn);
115 void addExtension(ExtensionPointTy Ty, ExtensionFn Fn);
118 void addExtensionsToPM(ExtensionPointTy ETy, PassManagerBase &PM) const;
119 void addInitialAliasAnalysisPasses(PassManagerBase &PM) const;
122 /// populateFunctionPassManager - This fills in the function pass manager,
123 /// which is expected to be run on each function immediately as it is
124 /// generated. The idea is to reduce the size of the IR in memory.
125 void populateFunctionPassManager(FunctionPassManager &FPM);
127 /// populateModulePassManager - This sets up the primary pass manager.
128 void populateModulePassManager(PassManagerBase &MPM);
129 void populateLTOPassManager(PassManagerBase &PM, bool Internalize,
132 /// Registers a function for adding a standard set of passes. This should be
133 /// used by optimizer plugins to allow all front ends to transparently use
134 /// them. Create a static instance of this class in your plugin, providing a
135 /// private function that the PassManagerBuilder can use to add your passes.
136 struct RegisterStandardPasses {
137 RegisterStandardPasses(PassManagerBuilder::ExtensionPointTy Ty,
138 PassManagerBuilder::ExtensionFn Fn) {
139 PassManagerBuilder::addGlobalExtension(Ty, Fn);
142 } // end namespace llvm