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65e2e8c2fe
Getting this right convinces the memory verifier to not complain about untouched empty pack result arguments, which should be innocuous.
622 lines
23 KiB
C++
622 lines
23 KiB
C++
//===- SILFunctionConventions.h - Defines SIL func. conventions -*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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///
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/// This file defines the SILModuleConventions and SILFunctionConventions
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/// classes. These interfaces are used to determine when SIL can represent
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/// values of a given lowered type by value and when they must be represented by
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/// address. This is influenced by a SILModule-wide "lowered address" convention,
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/// which reflects whether the current SIL stage requires lowered addresses.
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///
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/// The primary purpose of this API is mapping the formal SIL parameter and
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/// result conventions onto the SIL argument types. The "formal" conventions are
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/// immutably associated with a SILFunctionType--a SIL function's type
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/// information never changes. The SIL conventions determine how those formal
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/// conventions will be represented in the body of SIL functions and at call
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/// sites.
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///
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_SIL_FUNCTIONCONVENTIONS_H
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#define SWIFT_SIL_FUNCTIONCONVENTIONS_H
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#include "swift/AST/Types.h"
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#include "swift/SIL/SILArgumentConvention.h"
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#include "swift/SIL/SILType.h"
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#include "llvm/Support/ErrorHandling.h"
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namespace swift {
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template<bool _, template<typename...> class T, typename...Args>
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struct delay_template_expansion {
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using type = T<Args...>;
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};
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/// Transient wrapper for SILParameterInfo and SILResultInfo conventions. This
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/// abstraction helps handle the transition from canonical SIL conventions to
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/// lowered SIL conventions.
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class SILModuleConventions {
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friend SILParameterInfo;
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friend SILResultInfo;
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friend SILFunctionConventions;
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static bool isIndirectSILParam(SILParameterInfo param,
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bool loweredAddresses);
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static bool isIndirectSILYield(SILYieldInfo yield,
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bool loweredAddresses);
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static bool isIndirectSILResult(SILResultInfo result,
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bool loweredAddresses);
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static SILType getSILParamInterfaceType(
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SILParameterInfo yield,
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bool loweredAddresses);
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static SILType getSILYieldInterfaceType(
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SILYieldInfo yield,
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bool loweredAddresses);
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static SILType getSILResultInterfaceType(
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SILResultInfo param,
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bool loweredAddresses);
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public:
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static bool isPassedIndirectlyInSIL(SILType type, SILModule &M);
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static bool isReturnedIndirectlyInSIL(SILType type, SILModule &M);
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static SILModuleConventions getLoweredAddressConventions(SILModule &M) {
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return SILModuleConventions(M, true);
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}
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private:
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SILModule *M;
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bool loweredAddresses;
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SILModuleConventions(SILModule &M, bool loweredAddresses)
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: M(&M), loweredAddresses(loweredAddresses)
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{}
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public:
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SILModuleConventions(SILModule &M);
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SILFunctionConventions getFunctionConventions(CanSILFunctionType funcTy);
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SILModule &getModule() const { return *M; }
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bool useLoweredAddresses() const { return loweredAddresses; }
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bool isSILIndirect(SILParameterInfo param) const {
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return isIndirectSILParam(param, loweredAddresses);
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}
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bool isSILIndirect(SILYieldInfo yield) const {
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return isIndirectSILYield(yield, loweredAddresses);
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}
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bool isSILIndirect(SILResultInfo result) const {
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return isIndirectSILResult(result, loweredAddresses);
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}
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SILType getSILType(SILParameterInfo param, CanSILFunctionType funcTy,
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TypeExpansionContext context) const {
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auto interfaceTy = getSILParamInterfaceType(param, loweredAddresses);
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// TODO: Always require a function type
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if (funcTy)
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return funcTy->substInterfaceType(*M, interfaceTy, context);
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return interfaceTy;
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}
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SILType getSILType(SILYieldInfo yield, CanSILFunctionType funcTy,
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TypeExpansionContext context) const {
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auto interfaceTy = getSILYieldInterfaceType(yield, loweredAddresses);
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// TODO: Always require a function type
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if (funcTy)
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return funcTy->substInterfaceType(*M, interfaceTy, context);
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return interfaceTy;
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}
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SILType getSILType(SILResultInfo result, CanSILFunctionType funcTy,
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TypeExpansionContext context) const {
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auto interfaceTy = getSILResultInterfaceType(result, loweredAddresses);
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// TODO: Always require a function type
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if (funcTy)
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return funcTy->substInterfaceType(*M, interfaceTy, context);
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return interfaceTy;
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}
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};
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/// Transient wrapper for SIL-level argument conventions. This abstraction helps
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/// handle the transition from canonical SIL conventions to lowered SIL
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/// conventions.
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class SILFunctionConventions {
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public:
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SILModuleConventions silConv;
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CanSILFunctionType funcTy;
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SILFunctionConventions(CanSILFunctionType funcTy, SILModule &M)
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: silConv(M), funcTy(funcTy) {}
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SILFunctionConventions(CanSILFunctionType funcTy,
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SILModuleConventions silConv)
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: silConv(silConv), funcTy(funcTy) {}
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//===--------------------------------------------------------------------===//
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// SILModuleConventions API for convenience.
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//===--------------------------------------------------------------------===//
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bool useLoweredAddresses() const { return silConv.useLoweredAddresses(); }
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bool isSILIndirect(SILParameterInfo param) const {
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return silConv.isSILIndirect(param);
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}
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bool isSILIndirect(SILYieldInfo yield) const {
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return silConv.isSILIndirect(yield);
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}
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bool isSILIndirect(SILResultInfo result) const {
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return silConv.isSILIndirect(result);
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}
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SILType getSILType(SILParameterInfo param,
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TypeExpansionContext context) const {
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return silConv.getSILType(param, funcTy, context);
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}
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SILType getSILType(SILYieldInfo yield, TypeExpansionContext context) const {
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return silConv.getSILType(yield, funcTy, context);
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}
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SILType getSILType(SILResultInfo result, TypeExpansionContext context) const {
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return silConv.getSILType(result, funcTy, context);
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}
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//===--------------------------------------------------------------------===//
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// SIL results.
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//===--------------------------------------------------------------------===//
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/// Get the normal result type of an apply that calls this function.
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/// This does not include indirect SIL results.
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SILType getSILResultType(TypeExpansionContext context) {
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if (silConv.loweredAddresses)
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return funcTy->getDirectFormalResultsType(silConv.getModule(), context);
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return funcTy->getAllResultsSubstType(silConv.getModule(), context);
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}
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/// Get the SIL type for the single result which may be direct or indirect.
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SILType getSingleSILResultType(TypeExpansionContext context) {
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return getSILType(funcTy->getSingleResult(), context);
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}
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/// Get the error result type.
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SILType getSILErrorType(TypeExpansionContext context) {
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return getSILType(funcTy->getErrorResult(), context);
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}
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/// Returns an array of result info.
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/// Provides convenient access to the underlying SILFunctionType.
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ArrayRef<SILResultInfo> getResults() const {
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return funcTy->getResults();
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}
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/// Get the number of SIL results passed as address-typed arguments.
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unsigned getNumIndirectSILResults() const {
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// TODO: Return packs directly in lowered-address mode
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return silConv.loweredAddresses ? funcTy->getNumIndirectFormalResults()
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: funcTy->getNumPackResults();
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}
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/// Are any SIL results passed as address-typed arguments?
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bool hasIndirectSILResults() const { return getNumIndirectSILResults() != 0; }
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struct IndirectSILResultFilter {
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bool loweredAddresses;
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IndirectSILResultFilter(bool loweredAddresses)
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: loweredAddresses(loweredAddresses) {}
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bool operator()(SILResultInfo result) const {
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return (loweredAddresses ? result.isFormalIndirect() : result.isPack());
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}
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};
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using IndirectSILResultIter =
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llvm::filter_iterator<const SILResultInfo *, IndirectSILResultFilter>;
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using IndirectSILResultRange = iterator_range<IndirectSILResultIter>;
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/// Return a range of indirect result information for results passed as
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/// address-typed SIL arguments.
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IndirectSILResultRange getIndirectSILResults() const {
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return llvm::make_filter_range(
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funcTy->getResults(),
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IndirectSILResultFilter(silConv.loweredAddresses));
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}
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struct SILResultTypeFunc;
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// Gratuitous template parameter is to delay instantiating `mapped_iterator`
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// on the incomplete type SILResultTypeFunc.
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template<bool _ = false>
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using IndirectSILResultTypeIter = typename delay_template_expansion<_,
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llvm::mapped_iterator, IndirectSILResultIter, SILResultTypeFunc>::type;
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template<bool _ = false>
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using IndirectSILResultTypeRange = iterator_range<IndirectSILResultTypeIter<_>>;
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/// Return a range of SILTypes for each result passed as an address-typed SIL
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/// argument.
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template <bool _ = false>
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IndirectSILResultTypeRange<_>
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getIndirectSILResultTypes(TypeExpansionContext context) const;
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/// Get the number of SIL results directly returned by SIL value.
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unsigned getNumDirectSILResults() const {
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return silConv.loweredAddresses ? funcTy->getNumDirectFormalResults()
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: funcTy->getNumResults() - funcTy->getNumPackResults();
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}
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/// Like getNumDirectSILResults but @out tuples, which are not flattened in
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/// the return type, are recursively flattened in the count.
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template <bool _ = false>
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unsigned getNumExpandedDirectSILResults(TypeExpansionContext context) const;
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struct DirectSILResultFilter {
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bool loweredAddresses;
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DirectSILResultFilter(bool loweredAddresses)
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: loweredAddresses(loweredAddresses) {}
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bool operator()(SILResultInfo result) const {
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return (loweredAddresses ? !result.isFormalIndirect() : !result.isPack());
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}
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};
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using DirectSILResultIter =
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llvm::filter_iterator<const SILResultInfo *, DirectSILResultFilter>;
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using DirectSILResultRange = iterator_range<DirectSILResultIter>;
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/// Return a range of direct result information for results directly returned
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/// by SIL value.
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DirectSILResultRange getDirectSILResults() const {
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return llvm::make_filter_range(
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funcTy->getResults(), DirectSILResultFilter(silConv.loweredAddresses));
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}
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template<bool _ = false>
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using DirectSILResultTypeIter = typename delay_template_expansion<_,
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llvm::mapped_iterator, DirectSILResultIter, SILResultTypeFunc>::type;
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template<bool _ = false>
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using DirectSILResultTypeRange = iterator_range<DirectSILResultTypeIter<_>>;
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/// Return a range of SILTypes for each result directly returned
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/// by SIL value.
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template <bool _ = false>
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DirectSILResultTypeRange<_>
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getDirectSILResultTypes(TypeExpansionContext context) const;
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//===--------------------------------------------------------------------===//
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// SIL parameters types.
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//===--------------------------------------------------------------------===//
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/// Returns the number of function parameters, not including any formally
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/// indirect results. Provides convenient access to the underlying
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/// SILFunctionType.
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unsigned getNumParameters() const { return funcTy->getNumParameters(); }
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/// Returns an array of parameter info, not including indirect
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/// results. Provides convenient access to the underlying SILFunctionType.
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ArrayRef<SILParameterInfo> getParameters() const {
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return funcTy->getParameters();
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}
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struct SILParameterTypeFunc;
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// Gratuitous template parameter is to delay instantiating `mapped_iterator`
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// on the incomplete type SILParameterTypeFunc.
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template<bool _ = false>
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using SILParameterTypeIter = typename
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delay_template_expansion<_, llvm::mapped_iterator,
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const SILParameterInfo *, SILParameterTypeFunc>::type;
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template<bool _ = false>
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using SILParameterTypeRange = iterator_range<SILParameterTypeIter<_>>;
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/// Return a range of SILTypes for each function parameter, not including
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/// indirect results.
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template <bool _ = false>
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SILParameterTypeRange<_>
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getParameterSILTypes(TypeExpansionContext context) const;
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//===--------------------------------------------------------------------===//
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// SIL yield types.
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//===--------------------------------------------------------------------===//
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unsigned getNumYields() const { return funcTy->getNumYields(); }
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ArrayRef<SILYieldInfo> getYields() const {
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return funcTy->getYields();
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}
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template<bool _ = false>
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using SILYieldTypeIter = typename
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delay_template_expansion<_, llvm::mapped_iterator,
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const SILYieldInfo *, SILParameterTypeFunc>::type;
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template<bool _ = false>
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using SILYieldTypeRange = iterator_range<SILYieldTypeIter<_>>;
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template<bool _ = false>
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SILYieldTypeRange<_> getYieldSILTypes(TypeExpansionContext context) const;
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SILYieldInfo getYieldInfoForOperandIndex(unsigned opIndex) const {
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return getYields()[opIndex];
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}
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//===--------------------------------------------------------------------===//
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// SILArgument API, including indirect results and parameters.
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//
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// The argument indices below relate to full applies in which the caller and
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// callee indices match. Partial apply indices are shifted on the caller
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// side. See ApplySite::getCalleeArgIndexOfFirstAppliedArg().
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//===--------------------------------------------------------------------===//
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unsigned getSILArgIndexOfFirstIndirectResult() const { return 0; }
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unsigned getSILArgIndexOfFirstParam() const {
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return getNumIndirectSILResults();
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}
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/// Returns the index of self.
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unsigned getSILArgIndexOfSelf() const {
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return getSILArgIndexOfFirstParam() + getNumParameters() - 1;
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}
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/// Get the index into formal indirect results corresponding to the given SIL
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/// indirect result argument index.
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unsigned getIndirectFormalResultIndexForSILArg(unsigned argIdx) const {
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assert(argIdx <= getNumIndirectSILResults());
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unsigned curArgIdx = 0;
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unsigned formalIdx = 0;
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for (auto formalResult : funcTy->getIndirectFormalResults()) {
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if (isSILIndirect(formalResult)) {
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if (curArgIdx == argIdx)
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return formalIdx;
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++curArgIdx;
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}
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++formalIdx;
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}
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llvm_unreachable("missing indirect formal result for SIL argument.");
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}
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/// Get the total number of arguments for a full apply in SIL of
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/// this function type. This is also the total number of SILArguments
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/// in the entry block.
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unsigned getNumSILArguments() const {
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return getNumIndirectSILResults() + funcTy->getNumParameters();
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}
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SILParameterInfo getParamInfoForSILArg(unsigned index) const {
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assert(index >= getNumIndirectSILResults()
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&& index <= getNumSILArguments());
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return funcTy->getParameters()[index - getNumIndirectSILResults()];
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}
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/// Return the SIL argument convention of apply/entry argument at
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/// the given argument index.
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SILArgumentConvention getSILArgumentConvention(unsigned index) const;
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/// Return the SIL type of the apply/entry argument at the given index.
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SILType getSILArgumentType(unsigned index,
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TypeExpansionContext context) const;
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/// Returns true if this function does not return to the caller.
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bool isNoReturn(TypeExpansionContext context) const;
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};
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struct SILFunctionConventions::SILResultTypeFunc {
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SILFunctionConventions silConv;
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TypeExpansionContext context;
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SILResultTypeFunc(const SILFunctionConventions &silConv,
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TypeExpansionContext context)
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: silConv(silConv), context(context) {}
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SILType operator()(SILResultInfo result) const {
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return silConv.getSILType(result, context);
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}
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};
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template <bool _>
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SILFunctionConventions::IndirectSILResultTypeRange<_>
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SILFunctionConventions::getIndirectSILResultTypes(
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TypeExpansionContext context) const {
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return llvm::map_range(getIndirectSILResults(),
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SILResultTypeFunc(*this, context));
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}
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template <bool _>
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SILFunctionConventions::DirectSILResultTypeRange<_>
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SILFunctionConventions::getDirectSILResultTypes(
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TypeExpansionContext context) const {
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return llvm::map_range(getDirectSILResults(),
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SILResultTypeFunc(*this, context));
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}
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template <bool _>
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unsigned SILFunctionConventions::getNumExpandedDirectSILResults(
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TypeExpansionContext context) const {
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if (silConv.loweredAddresses)
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return funcTy->getNumDirectFormalResults();
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unsigned retval = 0;
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// Worklist of elements to flatten or count.
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SmallVector<SILType, 4> flattenedElements;
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// Seed the worklist with the direct results.
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for (auto result : getDirectSILResultTypes(context)) {
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flattenedElements.push_back(result);
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}
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// Pop elements from the worklist and either increment the count or, if the
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// type is a tuple, add its elements to the worklist.
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while (!flattenedElements.empty()) {
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auto ty = flattenedElements.pop_back_val();
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if (auto tupleType = ty.getASTType()->getAs<TupleType>()) {
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for (auto index :
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llvm::reverse(indices(tupleType->getElementTypes()))) {
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flattenedElements.push_back(ty.getTupleElementType(index));
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}
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} else {
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retval += 1;
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}
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}
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return retval;
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}
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struct SILFunctionConventions::SILParameterTypeFunc {
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SILFunctionConventions silConv;
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TypeExpansionContext context;
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SILParameterTypeFunc(const SILFunctionConventions &silConv,
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TypeExpansionContext context)
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: silConv(silConv), context(context) {}
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SILType operator()(SILParameterInfo param) const {
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return silConv.getSILType(param, context);
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}
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};
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template <bool _>
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SILFunctionConventions::SILParameterTypeRange<_>
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SILFunctionConventions::getParameterSILTypes(
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TypeExpansionContext context) const {
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return llvm::map_range(funcTy->getParameters(),
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SILParameterTypeFunc(*this, context));
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}
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template <bool _>
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SILFunctionConventions::SILYieldTypeRange<_>
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SILFunctionConventions::getYieldSILTypes(TypeExpansionContext context) const {
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return llvm::map_range(funcTy->getYields(),
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SILParameterTypeFunc(*this, context));
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}
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inline SILType
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SILFunctionConventions::getSILArgumentType(unsigned index,
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TypeExpansionContext context) const {
|
|
assert(index <= getNumSILArguments());
|
|
if (index < getNumIndirectSILResults()) {
|
|
return *std::next(getIndirectSILResultTypes(context).begin(), index);
|
|
}
|
|
return getSILType(
|
|
funcTy->getParameters()[index - getNumIndirectSILResults()], context);
|
|
}
|
|
|
|
inline bool
|
|
SILFunctionConventions::isNoReturn(TypeExpansionContext context) const {
|
|
return funcTy->isNoReturnFunction(silConv.getModule(), context);
|
|
}
|
|
|
|
inline SILFunctionConventions
|
|
SILModuleConventions::getFunctionConventions(CanSILFunctionType funcTy) {
|
|
return SILFunctionConventions(funcTy, *this);
|
|
}
|
|
|
|
inline bool SILModuleConventions::isIndirectSILParam(SILParameterInfo param,
|
|
bool loweredAddresses) {
|
|
switch (param.getConvention()) {
|
|
case ParameterConvention::Direct_Unowned:
|
|
case ParameterConvention::Direct_Guaranteed:
|
|
case ParameterConvention::Direct_Owned:
|
|
return false;
|
|
|
|
case ParameterConvention::Pack_Inout:
|
|
case ParameterConvention::Pack_Owned:
|
|
case ParameterConvention::Pack_Guaranteed:
|
|
return true;
|
|
|
|
case ParameterConvention::Indirect_In:
|
|
case ParameterConvention::Indirect_In_Guaranteed:
|
|
return (loweredAddresses ||
|
|
param.getInterfaceType()->isOpenedExistentialWithError());
|
|
case ParameterConvention::Indirect_Inout:
|
|
case ParameterConvention::Indirect_InoutAliasable:
|
|
return true;
|
|
}
|
|
llvm_unreachable("covered switch isn't covered?!");
|
|
}
|
|
|
|
inline bool SILModuleConventions::isIndirectSILYield(SILYieldInfo yield,
|
|
bool loweredAddresses) {
|
|
return isIndirectSILParam(yield, loweredAddresses);
|
|
}
|
|
|
|
inline bool SILModuleConventions::isIndirectSILResult(SILResultInfo result,
|
|
bool loweredAddresses) {
|
|
switch (result.getConvention()) {
|
|
case ResultConvention::Indirect:
|
|
return (loweredAddresses ||
|
|
result.getInterfaceType()->isOpenedExistentialWithError());
|
|
case ResultConvention::Pack:
|
|
return true;
|
|
case ResultConvention::Owned:
|
|
case ResultConvention::Unowned:
|
|
case ResultConvention::UnownedInnerPointer:
|
|
case ResultConvention::Autoreleased:
|
|
return false;
|
|
}
|
|
|
|
llvm_unreachable("Unhandled ResultConvention in switch.");
|
|
}
|
|
|
|
inline SILType SILModuleConventions::getSILParamInterfaceType(
|
|
SILParameterInfo param,
|
|
bool loweredAddresses) {
|
|
return SILModuleConventions::isIndirectSILParam(param,loweredAddresses)
|
|
? SILType::getPrimitiveAddressType(param.getInterfaceType())
|
|
: SILType::getPrimitiveObjectType(param.getInterfaceType());
|
|
}
|
|
|
|
inline SILType SILModuleConventions::getSILYieldInterfaceType(
|
|
SILYieldInfo yield,
|
|
bool loweredAddresses) {
|
|
return getSILParamInterfaceType(yield, loweredAddresses);
|
|
}
|
|
|
|
inline SILType SILModuleConventions::getSILResultInterfaceType(
|
|
SILResultInfo result,
|
|
bool loweredAddresses) {
|
|
return SILModuleConventions::isIndirectSILResult(result, loweredAddresses)
|
|
? SILType::getPrimitiveAddressType(result.getInterfaceType())
|
|
: SILType::getPrimitiveObjectType(result.getInterfaceType());
|
|
}
|
|
|
|
inline SILType
|
|
SILParameterInfo::getSILStorageInterfaceType() const {
|
|
return SILModuleConventions::getSILParamInterfaceType(*this, true);
|
|
}
|
|
|
|
inline SILType
|
|
SILResultInfo::getSILStorageInterfaceType() const {
|
|
return SILModuleConventions::getSILResultInterfaceType(*this, true);
|
|
}
|
|
|
|
inline SILType
|
|
SILParameterInfo::getSILStorageType(SILModule &M,
|
|
const SILFunctionType *funcTy,
|
|
TypeExpansionContext context) const {
|
|
return funcTy->substInterfaceType(M, getSILStorageInterfaceType(),
|
|
context);
|
|
}
|
|
|
|
inline SILType
|
|
SILResultInfo::getSILStorageType(SILModule &M, const SILFunctionType *funcTy,
|
|
TypeExpansionContext context) const {
|
|
return funcTy->substInterfaceType(M, getSILStorageInterfaceType(),
|
|
context);
|
|
}
|
|
|
|
} // end swift namespace
|
|
|
|
#endif
|