[PM] Create a separate library for high-level pass management code.

This will provide the analogous replacements for the PassManagerBuilder
and other code long term. This code is extracted from the opt tool
currently, and I plan to extend it as I build up support for using the
new pass manager in Clang and other places.

Mailing this out for review in part to let folks comment on the terrible names
here. A brief word about why I chose the names I did.

The library is called "Passes" to try and make it clear that it is a high-level
utility and where *all* of the passes come together and are registered in
a common library. I didn't want it to be *limited* to a registry though, the
registry is just one component.

The class is a "PassBuilder" but this name I'm less happy with. It doesn't
build passes in any traditional sense and isn't a Builder-style API at all. The
class is a PassRegisterer or PassAdder, but neither of those really make a lot
of sense. This class is responsible for constructing passes for registry in an
analysis manager or for population of a pass pipeline. If anyone has a better
name, I would love to hear it. The other candidate I looked at was
PassRegistrar, but that doesn't really fit either. There is no register of all
the passes in use, and so I think continuing the "registry" analog outside of
the registry of pass *names* and *types* is a mistake. The objects themselves
are just objects with the new pass manager.

Differential Revision: http://reviews.llvm.org/D8054

llvm-svn: 231556

include/llvm/Passes/PassBuilder.h

@@ -1,4 +1,4 @@
-//===- Passes.h - Utilities for manipulating all passes ---------*- C++ -*-===//
+//===- Parsing, selection, and construction of pass pipelines --*- C++ -*--===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -8,13 +8,13 @@
 //===----------------------------------------------------------------------===//
 /// \file
 ///
-/// Interfaces for registering passes, producing common pass manager
+/// Interfaces for registering analysis passes, producing common pass manager
 /// configurations, and parsing of pass pipelines.
 ///
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_TOOLS_OPT_PASSES_H
-#define LLVM_TOOLS_OPT_PASSES_H
+#ifndef LLVM_PASSES_PASSBUILDER_H
+#define LLVM_PASSES_PASSBUILDER_H
 
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Analysis/CGSCCPassManager.h"
@@ -23,17 +23,17 @@
 namespace llvm {
 class TargetMachine;
 
-/// \brief This class provides access to all of LLVM's passes.
+/// \brief This class provides access to building LLVM's passes.
 ///
 /// It's members provide the baseline state available to passes during their
 /// construction. The \c PassRegistry.def file specifies how to construct all
 /// of the built-in passes, and those may reference these members during
 /// construction.
-class Passes {
+class PassBuilder {
   TargetMachine *TM;
 
 public:
-  explicit Passes(TargetMachine *TM = nullptr) : TM(TM) {}
+  explicit PassBuilder(TargetMachine *TM = nullptr) : TM(TM) {}
 
   /// \brief Registers all available module analysis passes.
   ///

lib/CMakeLists.txt

@@ -18,3 +18,4 @@ add_subdirectory(AsmParser)
 add_subdirectory(LineEditor)
 add_subdirectory(ProfileData)
 add_subdirectory(Fuzzer)
+add_subdirectory(Passes)

lib/LLVMBuild.txt

@@ -16,7 +16,7 @@
 ;===------------------------------------------------------------------------===;
 
 [common]
-subdirectories = Analysis AsmParser Bitcode CodeGen DebugInfo ExecutionEngine LineEditor Linker IR IRReader LTO MC Object Option ProfileData Support TableGen Target Transforms
+subdirectories = Analysis AsmParser Bitcode CodeGen DebugInfo ExecutionEngine LineEditor Linker IR IRReader LTO MC Object Option Passes ProfileData Support TableGen Target Transforms
 
 [component_0]
 type = Group

lib/Makefile

@@ -12,6 +12,6 @@ include $(LEVEL)/Makefile.config
 
 PARALLEL_DIRS := IR AsmParser Bitcode Analysis Transforms CodeGen Target      \
                  ExecutionEngine Linker LTO MC Object Option DebugInfo        \
-                 IRReader LineEditor ProfileData
+                 IRReader LineEditor ProfileData Passes
 
 include $(LEVEL)/Makefile.common

lib/Passes/CMakeLists.txt

@@ -0,0 +1,6 @@
+add_llvm_library(LLVMPasses
+  PassBuilder.cpp
+
+  ADDITIONAL_HEADER_DIRS
+  ${LLVM_MAIN_INCLUDE_DIR}/llvm/Passes
+  )

lib/Passes/LLVMBuild.txt

@@ -0,0 +1,22 @@
+;===- ./lib/Passes/LLVMBuild.txt -------------------------------*- Conf -*--===;
+;
+;                     The LLVM Compiler Infrastructure
+;
+; This file is distributed under the University of Illinois Open Source
+; License. See LICENSE.TXT for details.
+;
+;===------------------------------------------------------------------------===;
+;
+; This is an LLVMBuild description file for the components in this subdirectory.
+;
+; For more information on the LLVMBuild system, please see:
+;
+;   http://llvm.org/docs/LLVMBuild.html
+;
+;===------------------------------------------------------------------------===;
+
+[component_0]
+type = Library
+name = Passes
+parent = Libraries
+required_libraries = Analysis Core IPA IPO InstCombine Scalar Support TransformUtils Vectorize

lib/Passes/Makefile

@@ -0,0 +1,14 @@
+##===- lib/Passes/Makefile ---------------------------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../..
+LIBRARYNAME = LLVMPasses
+BUILD_ARCHIVE := 1
+
+include $(LEVEL)/Makefile.common

lib/Passes/PassBuilder.cpp

@@ -1,4 +1,4 @@
-//===- Passes.cpp - Parsing, selection, and running of passes -------------===//
+//===- Parsing, selection, and construction of pass pipelines -------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -8,13 +8,14 @@
 //===----------------------------------------------------------------------===//
 /// \file
 ///
-/// This file provides the infrastructure to parse and build a custom pass
-/// manager based on a commandline flag. It also provides helpers to aid in
-/// analyzing, debugging, and testing pass structures.
+/// This file provides the implementation of the PassBuilder based on our
+/// static pass registry as well as related functionality. It also provides
+/// helpers to aid in analyzing, debugging, and testing passes and pass
+/// pipelines.
 ///
 //===----------------------------------------------------------------------===//
 
-#include "Passes.h"
+#include "llvm/Passes/PassBuilder.h"
 #include "llvm/Analysis/AssumptionCache.h"
 #include "llvm/Analysis/CGSCCPassManager.h"
 #include "llvm/Analysis/LazyCallGraph.h"
@@ -94,19 +95,19 @@ char NoOpFunctionAnalysis::PassID;
 
 } // End anonymous namespace.
 
-void Passes::registerModuleAnalyses(ModuleAnalysisManager &MAM) {
+void PassBuilder::registerModuleAnalyses(ModuleAnalysisManager &MAM) {
 #define MODULE_ANALYSIS(NAME, CREATE_PASS) \
   MAM.registerPass(CREATE_PASS);
 #include "PassRegistry.def"
 }
 
-void Passes::registerCGSCCAnalyses(CGSCCAnalysisManager &CGAM) {
+void PassBuilder::registerCGSCCAnalyses(CGSCCAnalysisManager &CGAM) {
 #define CGSCC_ANALYSIS(NAME, CREATE_PASS) \
   CGAM.registerPass(CREATE_PASS);
 #include "PassRegistry.def"
 }
 
-void Passes::registerFunctionAnalyses(FunctionAnalysisManager &FAM) {
+void PassBuilder::registerFunctionAnalyses(FunctionAnalysisManager &FAM) {
 #define FUNCTION_ANALYSIS(NAME, CREATE_PASS) \
   FAM.registerPass(CREATE_PASS);
 #include "PassRegistry.def"
@@ -144,7 +145,7 @@ static bool isFunctionPassName(StringRef Name) {
   return false;
 }
 
-bool Passes::parseModulePassName(ModulePassManager &MPM, StringRef Name) {
+bool PassBuilder::parseModulePassName(ModulePassManager &MPM, StringRef Name) {
 #define MODULE_PASS(NAME, CREATE_PASS)                                         \
   if (Name == NAME) {                                                          \
     MPM.addPass(CREATE_PASS);                                                  \
@@ -164,7 +165,7 @@ bool Passes::parseModulePassName(ModulePassManager &MPM, StringRef Name) {
   return false;
 }
 
-bool Passes::parseCGSCCPassName(CGSCCPassManager &CGPM, StringRef Name) {
+bool PassBuilder::parseCGSCCPassName(CGSCCPassManager &CGPM, StringRef Name) {
 #define CGSCC_PASS(NAME, CREATE_PASS)                                          \
   if (Name == NAME) {                                                          \
     CGPM.addPass(CREATE_PASS);                                                 \
@@ -184,7 +185,8 @@ bool Passes::parseCGSCCPassName(CGSCCPassManager &CGPM, StringRef Name) {
   return false;
 }
 
-bool Passes::parseFunctionPassName(FunctionPassManager &FPM, StringRef Name) {
+bool PassBuilder::parseFunctionPassName(FunctionPassManager &FPM,
+                                        StringRef Name) {
 #define FUNCTION_PASS(NAME, CREATE_PASS)                                       \
   if (Name == NAME) {                                                          \
     FPM.addPass(CREATE_PASS);                                                  \
@@ -204,9 +206,10 @@ bool Passes::parseFunctionPassName(FunctionPassManager &FPM, StringRef Name) {
   return false;
 }
 
-bool Passes::parseFunctionPassPipeline(FunctionPassManager &FPM,
-                                       StringRef &PipelineText,
-                                       bool VerifyEachPass, bool DebugLogging) {
+bool PassBuilder::parseFunctionPassPipeline(FunctionPassManager &FPM,
+                                            StringRef &PipelineText,
+                                            bool VerifyEachPass,
+                                            bool DebugLogging) {
   for (;;) {
     // Parse nested pass managers by recursing.
     if (PipelineText.startswith("function(")) {
@@ -242,9 +245,10 @@ bool Passes::parseFunctionPassPipeline(FunctionPassManager &FPM,
   }
 }
 
-bool Passes::parseCGSCCPassPipeline(CGSCCPassManager &CGPM,
-                                    StringRef &PipelineText,
-                                    bool VerifyEachPass, bool DebugLogging) {
+bool PassBuilder::parseCGSCCPassPipeline(CGSCCPassManager &CGPM,
+                                         StringRef &PipelineText,
+                                         bool VerifyEachPass,
+                                         bool DebugLogging) {
   for (;;) {
     // Parse nested pass managers by recursing.
     if (PipelineText.startswith("cgscc(")) {
@@ -293,9 +297,10 @@ bool Passes::parseCGSCCPassPipeline(CGSCCPassManager &CGPM,
   }
 }
 
-bool Passes::parseModulePassPipeline(ModulePassManager &MPM,
-                                     StringRef &PipelineText,
-                                     bool VerifyEachPass, bool DebugLogging) {
+bool PassBuilder::parseModulePassPipeline(ModulePassManager &MPM,
+                                          StringRef &PipelineText,
+                                          bool VerifyEachPass,
+                                          bool DebugLogging) {
   for (;;) {
     // Parse nested pass managers by recursing.
     if (PipelineText.startswith("module(")) {
@@ -363,8 +368,9 @@ bool Passes::parseModulePassPipeline(ModulePassManager &MPM,
 // Primary pass pipeline description parsing routine.
 // FIXME: Should this routine accept a TargetMachine or require the caller to
 // pre-populate the analysis managers with target-specific stuff?
-bool Passes::parsePassPipeline(ModulePassManager &MPM, StringRef PipelineText,
-                               bool VerifyEachPass, bool DebugLogging) {
+bool PassBuilder::parsePassPipeline(ModulePassManager &MPM,
+                                    StringRef PipelineText, bool VerifyEachPass,
+                                    bool DebugLogging) {
   // By default, try to parse the pipeline as-if it were within an implicit
   // 'module(...)' pass pipeline. If this will parse at all, it needs to
   // consume the entire string.

tools/opt/CMakeLists.txt

@@ -16,6 +16,7 @@ set(LLVM_LINK_COMPONENTS
   Target
   TransformUtils
   Vectorize
+  Passes
   )
 
 # Support plugins.
@@ -26,7 +27,6 @@ add_llvm_tool(opt
   BreakpointPrinter.cpp
   GraphPrinters.cpp
   NewPMDriver.cpp
-  Passes.cpp
   PassPrinters.cpp
   PrintSCC.cpp
   opt.cpp

tools/opt/LLVMBuild.txt

@@ -19,4 +19,4 @@
 type = Tool
 name = opt
 parent = Tools
-required_libraries = AsmParser BitReader BitWriter CodeGen IRReader IPO Instrumentation Scalar ObjCARC all-targets
+required_libraries = AsmParser BitReader BitWriter CodeGen IRReader IPO Instrumentation Scalar ObjCARC Passes all-targets

tools/opt/Makefile

@@ -9,7 +9,7 @@
 
 LEVEL := ../..
 TOOLNAME := opt
-LINK_COMPONENTS := bitreader bitwriter asmparser irreader instrumentation scalaropts objcarcopts ipo vectorize all-targets codegen
+LINK_COMPONENTS := bitreader bitwriter asmparser irreader instrumentation scalaropts objcarcopts ipo vectorize all-targets codegen passes
 
 # Support plugins.
 NO_DEAD_STRIP := 1

tools/opt/NewPMDriver.cpp

@@ -14,7 +14,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "NewPMDriver.h"
-#include "Passes.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Analysis/CGSCCPassManager.h"
 #include "llvm/Bitcode/BitcodeWriterPass.h"
@@ -24,6 +23,7 @@
 #include "llvm/IR/Module.h"
 #include "llvm/IR/PassManager.h"
 #include "llvm/IR/Verifier.h"
+#include "llvm/Passes/PassBuilder.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/ToolOutputFile.h"
@@ -40,16 +40,16 @@ bool llvm::runPassPipeline(StringRef Arg0, LLVMContext &Context, Module &M,
                            TargetMachine *TM, tool_output_file *Out,
                            StringRef PassPipeline, OutputKind OK,
                            VerifierKind VK) {
-  Passes P(TM);
+  PassBuilder PB(TM);
 
   FunctionAnalysisManager FAM(DebugPM);
   CGSCCAnalysisManager CGAM(DebugPM);
   ModuleAnalysisManager MAM(DebugPM);
 
   // Register all the basic analyses with the managers.
-  P.registerModuleAnalyses(MAM);
-  P.registerCGSCCAnalyses(CGAM);
-  P.registerFunctionAnalyses(FAM);
+  PB.registerModuleAnalyses(MAM);
+  PB.registerCGSCCAnalyses(CGAM);
+  PB.registerFunctionAnalyses(FAM);
 
   // Cross register the analysis managers through their proxies.
   MAM.registerPass(FunctionAnalysisManagerModuleProxy(FAM));
@@ -63,8 +63,8 @@ bool llvm::runPassPipeline(StringRef Arg0, LLVMContext &Context, Module &M,
   if (VK > VK_NoVerifier)
     MPM.addPass(VerifierPass());
 
-  if (!P.parsePassPipeline(MPM, PassPipeline, VK == VK_VerifyEachPass,
-                           DebugPM)) {
+  if (!PB.parsePassPipeline(MPM, PassPipeline, VK == VK_VerifyEachPass,
+                            DebugPM)) {
     errs() << Arg0 << ": unable to parse pass pipeline description.\n";
     return false;
   }