llvm-6502/include/llvm/Analysis/CGSCCPassManager.h
Chandler Carruth 9f2150c046 [LCG] Normalize the post-order SCC iterator to just iterate over the SCC
values rather than having pointers in weird places.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207053 91177308-0d34-0410-b5e6-96231b3b80d8
2014-04-23 23:51:07 +00:00

592 lines
22 KiB
C++

//===- CGSCCPassManager.h - Call graph pass management ----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/// \file
///
/// This header provides classes for managing passes over SCCs of the call
/// graph. These passes form an important component of LLVM's interprocedural
/// optimizations. Because they operate on the SCCs of the call graph, and they
/// wtraverse the graph in post order, they can effectively do pair-wise
/// interprocedural optimizations for all call edges in the program. At each
/// call site edge, the callee has already been optimized as much as is
/// possible. This in turn allows very accurate analysis of it for IPO.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_CGSCC_PASS_MANAGER_H
#define LLVM_ANALYSIS_CGSCC_PASS_MANAGER_H
#include "llvm/IR/PassManager.h"
#include "llvm/Analysis/LazyCallGraph.h"
namespace llvm {
class CGSCCAnalysisManager;
class CGSCCPassManager {
public:
// We have to explicitly define all the special member functions because MSVC
// refuses to generate them.
CGSCCPassManager() {}
CGSCCPassManager(CGSCCPassManager &&Arg) : Passes(std::move(Arg.Passes)) {}
CGSCCPassManager &operator=(CGSCCPassManager &&RHS) {
Passes = std::move(RHS.Passes);
return *this;
}
/// \brief Run all of the CGSCC passes in this pass manager over a SCC.
PreservedAnalyses run(LazyCallGraph::SCC *C,
CGSCCAnalysisManager *AM = nullptr);
template <typename CGSCCPassT> void addPass(CGSCCPassT Pass) {
Passes.emplace_back(new CGSCCPassModel<CGSCCPassT>(std::move(Pass)));
}
static StringRef name() { return "CGSCCPassManager"; }
private:
// Pull in the concept type and model template specialized for SCCs.
typedef detail::PassConcept<LazyCallGraph::SCC *, CGSCCAnalysisManager>
CGSCCPassConcept;
template <typename PassT>
struct CGSCCPassModel
: detail::PassModel<LazyCallGraph::SCC *, CGSCCAnalysisManager, PassT> {
CGSCCPassModel(PassT Pass)
: detail::PassModel<LazyCallGraph::SCC *, CGSCCAnalysisManager, PassT>(
std::move(Pass)) {}
};
CGSCCPassManager(const CGSCCPassManager &) LLVM_DELETED_FUNCTION;
CGSCCPassManager &operator=(const CGSCCPassManager &) LLVM_DELETED_FUNCTION;
std::vector<std::unique_ptr<CGSCCPassConcept>> Passes;
};
/// \brief A function analysis manager to coordinate and cache analyses run over
/// a module.
class CGSCCAnalysisManager : public detail::AnalysisManagerBase<
CGSCCAnalysisManager, LazyCallGraph::SCC *> {
friend class detail::AnalysisManagerBase<CGSCCAnalysisManager,
LazyCallGraph::SCC *>;
typedef detail::AnalysisManagerBase<CGSCCAnalysisManager,
LazyCallGraph::SCC *> BaseT;
typedef BaseT::ResultConceptT ResultConceptT;
typedef BaseT::PassConceptT PassConceptT;
public:
// Most public APIs are inherited from the CRTP base class.
// We have to explicitly define all the special member functions because MSVC
// refuses to generate them.
CGSCCAnalysisManager() {}
CGSCCAnalysisManager(CGSCCAnalysisManager &&Arg)
: BaseT(std::move(static_cast<BaseT &>(Arg))),
CGSCCAnalysisResults(std::move(Arg.CGSCCAnalysisResults)) {}
CGSCCAnalysisManager &operator=(CGSCCAnalysisManager &&RHS) {
BaseT::operator=(std::move(static_cast<BaseT &>(RHS)));
CGSCCAnalysisResults = std::move(RHS.CGSCCAnalysisResults);
return *this;
}
/// \brief Returns true if the analysis manager has an empty results cache.
bool empty() const;
/// \brief Clear the function analysis result cache.
///
/// This routine allows cleaning up when the set of functions itself has
/// potentially changed, and thus we can't even look up a a result and
/// invalidate it directly. Notably, this does *not* call invalidate
/// functions as there is nothing to be done for them.
void clear();
private:
CGSCCAnalysisManager(const CGSCCAnalysisManager &) LLVM_DELETED_FUNCTION;
CGSCCAnalysisManager &
operator=(const CGSCCAnalysisManager &) LLVM_DELETED_FUNCTION;
/// \brief Get a function pass result, running the pass if necessary.
ResultConceptT &getResultImpl(void *PassID, LazyCallGraph::SCC *C);
/// \brief Get a cached function pass result or return null.
ResultConceptT *getCachedResultImpl(void *PassID,
LazyCallGraph::SCC *C) const;
/// \brief Invalidate a function pass result.
void invalidateImpl(void *PassID, LazyCallGraph::SCC *C);
/// \brief Invalidate the results for a function..
void invalidateImpl(LazyCallGraph::SCC *C, const PreservedAnalyses &PA);
/// \brief List of function analysis pass IDs and associated concept pointers.
///
/// Requires iterators to be valid across appending new entries and arbitrary
/// erases. Provides both the pass ID and concept pointer such that it is
/// half of a bijection and provides storage for the actual result concept.
typedef std::list<
std::pair<void *, std::unique_ptr<detail::AnalysisResultConcept<
LazyCallGraph::SCC *>>>> CGSCCAnalysisResultListT;
/// \brief Map type from function pointer to our custom list type.
typedef DenseMap<LazyCallGraph::SCC *, CGSCCAnalysisResultListT>
CGSCCAnalysisResultListMapT;
/// \brief Map from function to a list of function analysis results.
///
/// Provides linear time removal of all analysis results for a function and
/// the ultimate storage for a particular cached analysis result.
CGSCCAnalysisResultListMapT CGSCCAnalysisResultLists;
/// \brief Map type from a pair of analysis ID and function pointer to an
/// iterator into a particular result list.
typedef DenseMap<std::pair<void *, LazyCallGraph::SCC *>,
CGSCCAnalysisResultListT::iterator> CGSCCAnalysisResultMapT;
/// \brief Map from an analysis ID and function to a particular cached
/// analysis result.
CGSCCAnalysisResultMapT CGSCCAnalysisResults;
};
/// \brief A module analysis which acts as a proxy for a CGSCC analysis
/// manager.
///
/// This primarily proxies invalidation information from the module analysis
/// manager and module pass manager to a CGSCC analysis manager. You should
/// never use a CGSCC analysis manager from within (transitively) a module
/// pass manager unless your parent module pass has received a proxy result
/// object for it.
class CGSCCAnalysisManagerModuleProxy {
public:
class Result {
public:
explicit Result(CGSCCAnalysisManager &CGAM) : CGAM(&CGAM) {}
// We have to explicitly define all the special member functions because
// MSVC refuses to generate them.
Result(const Result &Arg) : CGAM(Arg.CGAM) {}
Result(Result &&Arg) : CGAM(std::move(Arg.CGAM)) {}
Result &operator=(Result RHS) {
std::swap(CGAM, RHS.CGAM);
return *this;
}
~Result();
/// \brief Accessor for the \c CGSCCAnalysisManager.
CGSCCAnalysisManager &getManager() { return *CGAM; }
/// \brief Handler for invalidation of the module.
///
/// If this analysis itself is preserved, then we assume that the call
/// graph of the module hasn't changed and thus we don't need to invalidate
/// *all* cached data associated with a \c SCC* in the \c
/// CGSCCAnalysisManager.
///
/// Regardless of whether this analysis is marked as preserved, all of the
/// analyses in the \c CGSCCAnalysisManager are potentially invalidated
/// based on the set of preserved analyses.
bool invalidate(Module *M, const PreservedAnalyses &PA);
private:
CGSCCAnalysisManager *CGAM;
};
static void *ID() { return (void *)&PassID; }
explicit CGSCCAnalysisManagerModuleProxy(CGSCCAnalysisManager &CGAM)
: CGAM(&CGAM) {}
// We have to explicitly define all the special member functions because MSVC
// refuses to generate them.
CGSCCAnalysisManagerModuleProxy(
const CGSCCAnalysisManagerModuleProxy &Arg)
: CGAM(Arg.CGAM) {}
CGSCCAnalysisManagerModuleProxy(CGSCCAnalysisManagerModuleProxy &&Arg)
: CGAM(std::move(Arg.CGAM)) {}
CGSCCAnalysisManagerModuleProxy &
operator=(CGSCCAnalysisManagerModuleProxy RHS) {
std::swap(CGAM, RHS.CGAM);
return *this;
}
/// \brief Run the analysis pass and create our proxy result object.
///
/// This doesn't do any interesting work, it is primarily used to insert our
/// proxy result object into the module analysis cache so that we can proxy
/// invalidation to the CGSCC analysis manager.
///
/// In debug builds, it will also assert that the analysis manager is empty
/// as no queries should arrive at the CGSCC analysis manager prior to
/// this analysis being requested.
Result run(Module *M);
private:
static char PassID;
CGSCCAnalysisManager *CGAM;
};
/// \brief A CGSCC analysis which acts as a proxy for a module analysis
/// manager.
///
/// This primarily provides an accessor to a parent module analysis manager to
/// CGSCC passes. Only the const interface of the module analysis manager is
/// provided to indicate that once inside of a CGSCC analysis pass you
/// cannot request a module analysis to actually run. Instead, the user must
/// rely on the \c getCachedResult API.
///
/// This proxy *doesn't* manage the invalidation in any way. That is handled by
/// the recursive return path of each layer of the pass manager and the
/// returned PreservedAnalysis set.
class ModuleAnalysisManagerCGSCCProxy {
public:
/// \brief Result proxy object for \c ModuleAnalysisManagerCGSCCProxy.
class Result {
public:
explicit Result(const ModuleAnalysisManager &MAM) : MAM(&MAM) {}
// We have to explicitly define all the special member functions because
// MSVC refuses to generate them.
Result(const Result &Arg) : MAM(Arg.MAM) {}
Result(Result &&Arg) : MAM(std::move(Arg.MAM)) {}
Result &operator=(Result RHS) {
std::swap(MAM, RHS.MAM);
return *this;
}
const ModuleAnalysisManager &getManager() const { return *MAM; }
/// \brief Handle invalidation by ignoring it, this pass is immutable.
bool invalidate(LazyCallGraph::SCC *) { return false; }
private:
const ModuleAnalysisManager *MAM;
};
static void *ID() { return (void *)&PassID; }
ModuleAnalysisManagerCGSCCProxy(const ModuleAnalysisManager &MAM)
: MAM(&MAM) {}
// We have to explicitly define all the special member functions because MSVC
// refuses to generate them.
ModuleAnalysisManagerCGSCCProxy(
const ModuleAnalysisManagerCGSCCProxy &Arg)
: MAM(Arg.MAM) {}
ModuleAnalysisManagerCGSCCProxy(ModuleAnalysisManagerCGSCCProxy &&Arg)
: MAM(std::move(Arg.MAM)) {}
ModuleAnalysisManagerCGSCCProxy &
operator=(ModuleAnalysisManagerCGSCCProxy RHS) {
std::swap(MAM, RHS.MAM);
return *this;
}
/// \brief Run the analysis pass and create our proxy result object.
/// Nothing to see here, it just forwards the \c MAM reference into the
/// result.
Result run(LazyCallGraph::SCC *) { return Result(*MAM); }
private:
static char PassID;
const ModuleAnalysisManager *MAM;
};
/// \brief The core module pass which does a post-order walk of the SCCs and
/// runs a CGSCC pass over each one.
///
/// Designed to allow composition of a CGSCCPass(Manager) and
/// a ModulePassManager. Note that this pass must be run with a module analysis
/// manager as it uses the LazyCallGraph analysis. It will also run the
/// \c CGSCCAnalysisManagerModuleProxy analysis prior to running the CGSCC
/// pass over the module to enable a \c FunctionAnalysisManager to be used
/// within this run safely.
template <typename CGSCCPassT> class ModuleToPostOrderCGSCCPassAdaptor {
public:
explicit ModuleToPostOrderCGSCCPassAdaptor(CGSCCPassT Pass)
: Pass(std::move(Pass)) {}
// We have to explicitly define all the special member functions because MSVC
// refuses to generate them.
ModuleToPostOrderCGSCCPassAdaptor(
const ModuleToPostOrderCGSCCPassAdaptor &Arg)
: Pass(Arg.Pass) {}
ModuleToPostOrderCGSCCPassAdaptor(ModuleToPostOrderCGSCCPassAdaptor &&Arg)
: Pass(std::move(Arg.Pass)) {}
friend void swap(ModuleToPostOrderCGSCCPassAdaptor &LHS,
ModuleToPostOrderCGSCCPassAdaptor &RHS) {
using std::swap;
swap(LHS.Pass, RHS.Pass);
}
ModuleToPostOrderCGSCCPassAdaptor &
operator=(ModuleToPostOrderCGSCCPassAdaptor RHS) {
swap(*this, RHS);
return *this;
}
/// \brief Runs the CGSCC pass across every SCC in the module.
PreservedAnalyses run(Module *M, ModuleAnalysisManager *AM) {
assert(AM && "We need analyses to compute the call graph!");
// Setup the CGSCC analysis manager from its proxy.
CGSCCAnalysisManager &CGAM =
AM->getResult<CGSCCAnalysisManagerModuleProxy>(M).getManager();
// Get the call graph for this module.
LazyCallGraph &CG = AM->getResult<LazyCallGraphAnalysis>(M);
PreservedAnalyses PA = PreservedAnalyses::all();
for (LazyCallGraph::SCC &C : CG.postorder_sccs()) {
PreservedAnalyses PassPA = Pass.run(&C, &CGAM);
// We know that the CGSCC pass couldn't have invalidated any other
// SCC's analyses (that's the contract of a CGSCC pass), so
// directly handle the CGSCC analysis manager's invalidation here.
// FIXME: This isn't quite correct. We need to handle the case where the
// pass updated the CG, particularly some child of the current SCC, and
// invalidate its analyses.
CGAM.invalidate(&C, PassPA);
// Then intersect the preserved set so that invalidation of module
// analyses will eventually occur when the module pass completes.
PA.intersect(std::move(PassPA));
}
// By definition we preserve the proxy. This precludes *any* invalidation
// of CGSCC analyses by the proxy, but that's OK because we've taken
// care to invalidate analyses in the CGSCC analysis manager
// incrementally above.
PA.preserve<CGSCCAnalysisManagerModuleProxy>();
return PA;
}
static StringRef name() { return "ModuleToPostOrderCGSCCPassAdaptor"; }
private:
CGSCCPassT Pass;
};
/// \brief A function to deduce a function pass type and wrap it in the
/// templated adaptor.
template <typename CGSCCPassT>
ModuleToPostOrderCGSCCPassAdaptor<CGSCCPassT>
createModuleToPostOrderCGSCCPassAdaptor(CGSCCPassT Pass) {
return std::move(
ModuleToPostOrderCGSCCPassAdaptor<CGSCCPassT>(std::move(Pass)));
}
/// \brief A CGSCC analysis which acts as a proxy for a function analysis
/// manager.
///
/// This primarily proxies invalidation information from the CGSCC analysis
/// manager and CGSCC pass manager to a function analysis manager. You should
/// never use a function analysis manager from within (transitively) a CGSCC
/// pass manager unless your parent CGSCC pass has received a proxy result
/// object for it.
class FunctionAnalysisManagerCGSCCProxy {
public:
class Result {
public:
explicit Result(FunctionAnalysisManager &FAM) : FAM(&FAM) {}
// We have to explicitly define all the special member functions because
// MSVC refuses to generate them.
Result(const Result &Arg) : FAM(Arg.FAM) {}
Result(Result &&Arg) : FAM(std::move(Arg.FAM)) {}
Result &operator=(Result RHS) {
std::swap(FAM, RHS.FAM);
return *this;
}
~Result();
/// \brief Accessor for the \c FunctionAnalysisManager.
FunctionAnalysisManager &getManager() { return *FAM; }
/// \brief Handler for invalidation of the SCC.
///
/// If this analysis itself is preserved, then we assume that the set of \c
/// Function objects in the \c SCC hasn't changed and thus we don't need
/// to invalidate *all* cached data associated with a \c Function* in the \c
/// FunctionAnalysisManager.
///
/// Regardless of whether this analysis is marked as preserved, all of the
/// analyses in the \c FunctionAnalysisManager are potentially invalidated
/// based on the set of preserved analyses.
bool invalidate(LazyCallGraph::SCC *C, const PreservedAnalyses &PA);
private:
FunctionAnalysisManager *FAM;
};
static void *ID() { return (void *)&PassID; }
explicit FunctionAnalysisManagerCGSCCProxy(FunctionAnalysisManager &FAM)
: FAM(&FAM) {}
// We have to explicitly define all the special member functions because MSVC
// refuses to generate them.
FunctionAnalysisManagerCGSCCProxy(
const FunctionAnalysisManagerCGSCCProxy &Arg)
: FAM(Arg.FAM) {}
FunctionAnalysisManagerCGSCCProxy(FunctionAnalysisManagerCGSCCProxy &&Arg)
: FAM(std::move(Arg.FAM)) {}
FunctionAnalysisManagerCGSCCProxy &
operator=(FunctionAnalysisManagerCGSCCProxy RHS) {
std::swap(FAM, RHS.FAM);
return *this;
}
/// \brief Run the analysis pass and create our proxy result object.
///
/// This doesn't do any interesting work, it is primarily used to insert our
/// proxy result object into the module analysis cache so that we can proxy
/// invalidation to the function analysis manager.
///
/// In debug builds, it will also assert that the analysis manager is empty
/// as no queries should arrive at the function analysis manager prior to
/// this analysis being requested.
Result run(LazyCallGraph::SCC *C);
private:
static char PassID;
FunctionAnalysisManager *FAM;
};
/// \brief A function analysis which acts as a proxy for a CGSCC analysis
/// manager.
///
/// This primarily provides an accessor to a parent CGSCC analysis manager to
/// function passes. Only the const interface of the CGSCC analysis manager is
/// provided to indicate that once inside of a function analysis pass you
/// cannot request a CGSCC analysis to actually run. Instead, the user must
/// rely on the \c getCachedResult API.
///
/// This proxy *doesn't* manage the invalidation in any way. That is handled by
/// the recursive return path of each layer of the pass manager and the
/// returned PreservedAnalysis set.
class CGSCCAnalysisManagerFunctionProxy {
public:
/// \brief Result proxy object for \c ModuleAnalysisManagerFunctionProxy.
class Result {
public:
explicit Result(const CGSCCAnalysisManager &CGAM) : CGAM(&CGAM) {}
// We have to explicitly define all the special member functions because
// MSVC refuses to generate them.
Result(const Result &Arg) : CGAM(Arg.CGAM) {}
Result(Result &&Arg) : CGAM(std::move(Arg.CGAM)) {}
Result &operator=(Result RHS) {
std::swap(CGAM, RHS.CGAM);
return *this;
}
const CGSCCAnalysisManager &getManager() const { return *CGAM; }
/// \brief Handle invalidation by ignoring it, this pass is immutable.
bool invalidate(Function *) { return false; }
private:
const CGSCCAnalysisManager *CGAM;
};
static void *ID() { return (void *)&PassID; }
CGSCCAnalysisManagerFunctionProxy(const CGSCCAnalysisManager &CGAM)
: CGAM(&CGAM) {}
// We have to explicitly define all the special member functions because MSVC
// refuses to generate them.
CGSCCAnalysisManagerFunctionProxy(
const CGSCCAnalysisManagerFunctionProxy &Arg)
: CGAM(Arg.CGAM) {}
CGSCCAnalysisManagerFunctionProxy(CGSCCAnalysisManagerFunctionProxy &&Arg)
: CGAM(std::move(Arg.CGAM)) {}
CGSCCAnalysisManagerFunctionProxy &
operator=(CGSCCAnalysisManagerFunctionProxy RHS) {
std::swap(CGAM, RHS.CGAM);
return *this;
}
/// \brief Run the analysis pass and create our proxy result object.
/// Nothing to see here, it just forwards the \c CGAM reference into the
/// result.
Result run(Function *) { return Result(*CGAM); }
private:
static char PassID;
const CGSCCAnalysisManager *CGAM;
};
/// \brief Adaptor that maps from a SCC to its functions.
///
/// Designed to allow composition of a FunctionPass(Manager) and
/// a CGSCCPassManager. Note that if this pass is constructed with a pointer
/// to a \c CGSCCAnalysisManager it will run the
/// \c FunctionAnalysisManagerCGSCCProxy analysis prior to running the function
/// pass over the SCC to enable a \c FunctionAnalysisManager to be used
/// within this run safely.
template <typename FunctionPassT> class CGSCCToFunctionPassAdaptor {
public:
explicit CGSCCToFunctionPassAdaptor(FunctionPassT Pass)
: Pass(std::move(Pass)) {}
// We have to explicitly define all the special member functions because MSVC
// refuses to generate them.
CGSCCToFunctionPassAdaptor(const CGSCCToFunctionPassAdaptor &Arg)
: Pass(Arg.Pass) {}
CGSCCToFunctionPassAdaptor(CGSCCToFunctionPassAdaptor &&Arg)
: Pass(std::move(Arg.Pass)) {}
friend void swap(CGSCCToFunctionPassAdaptor &LHS, CGSCCToFunctionPassAdaptor &RHS) {
using std::swap;
swap(LHS.Pass, RHS.Pass);
}
CGSCCToFunctionPassAdaptor &operator=(CGSCCToFunctionPassAdaptor RHS) {
swap(*this, RHS);
return *this;
}
/// \brief Runs the function pass across every function in the module.
PreservedAnalyses run(LazyCallGraph::SCC *C, CGSCCAnalysisManager *AM) {
FunctionAnalysisManager *FAM = nullptr;
if (AM)
// Setup the function analysis manager from its proxy.
FAM = &AM->getResult<FunctionAnalysisManagerCGSCCProxy>(C).getManager();
PreservedAnalyses PA = PreservedAnalyses::all();
for (LazyCallGraph::Node *N : *C) {
PreservedAnalyses PassPA = Pass.run(&N->getFunction(), FAM);
// We know that the function pass couldn't have invalidated any other
// function's analyses (that's the contract of a function pass), so
// directly handle the function analysis manager's invalidation here.
if (FAM)
FAM->invalidate(&N->getFunction(), PassPA);
// Then intersect the preserved set so that invalidation of module
// analyses will eventually occur when the module pass completes.
PA.intersect(std::move(PassPA));
}
// By definition we preserve the proxy. This precludes *any* invalidation
// of function analyses by the proxy, but that's OK because we've taken
// care to invalidate analyses in the function analysis manager
// incrementally above.
// FIXME: We need to update the call graph here to account for any deleted
// edges!
PA.preserve<FunctionAnalysisManagerCGSCCProxy>();
return PA;
}
static StringRef name() { return "CGSCCToFunctionPassAdaptor"; }
private:
FunctionPassT Pass;
};
/// \brief A function to deduce a function pass type and wrap it in the
/// templated adaptor.
template <typename FunctionPassT>
CGSCCToFunctionPassAdaptor<FunctionPassT>
createCGSCCToFunctionPassAdaptor(FunctionPassT Pass) {
return std::move(CGSCCToFunctionPassAdaptor<FunctionPassT>(std::move(Pass)));
}
}
#endif