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a16beaea3c
It was used for dead witness table elimination. But this is done now by lazy emission in IRGen. Also update DeadFunctionElimination. NFC.
121 lines
4.3 KiB
C++
121 lines
4.3 KiB
C++
//===--- InstructionUtils.h - Utilities for SIL instructions ----*- 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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#ifndef SWIFT_SIL_INSTRUCTIONUTILS_H
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#define SWIFT_SIL_INSTRUCTIONUTILS_H
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#include "swift/SIL/SILInstruction.h"
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namespace swift {
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/// Strip off casts/indexing insts/address projections from V until there is
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/// nothing left to strip.
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SILValue getUnderlyingObject(SILValue V);
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/// Strip off indexing and address projections.
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///
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/// This is similar to getUnderlyingObject, except that it does not strip any
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/// object-to-address projections, like ref_element_addr. In other words, the
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/// result is always an address value.
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SILValue getUnderlyingAddressRoot(SILValue V);
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SILValue getUnderlyingObjectStopAtMarkDependence(SILValue V);
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SILValue stripSinglePredecessorArgs(SILValue V);
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/// Return the underlying SILValue after stripping off all casts from the
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/// current SILValue.
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SILValue stripCasts(SILValue V);
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/// Return the underlying SILValue after stripping off all casts (but
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/// mark_dependence) from the current SILValue.
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SILValue stripCastsWithoutMarkDependence(SILValue V);
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/// Return the underlying SILValue after stripping off all upcasts from the
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/// current SILValue.
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SILValue stripUpCasts(SILValue V);
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/// Return the underlying SILValue after stripping off all
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/// upcasts and downcasts.
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SILValue stripClassCasts(SILValue V);
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/// Return the underlying SILValue after stripping off all address projection
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/// instructions.
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SILValue stripAddressProjections(SILValue V);
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/// Return the underlying SILValue after stripping off all address projection
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/// instructions which have a single operand.
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SILValue stripUnaryAddressProjections(SILValue V);
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/// Return the underlying SILValue after stripping off all aggregate projection
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/// instructions.
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///
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/// An aggregate projection instruction is either a struct_extract or a
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/// tuple_extract instruction.
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SILValue stripValueProjections(SILValue V);
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/// Return the underlying SILValue after stripping off all indexing
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/// instructions.
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///
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/// An indexing inst is either index_addr or index_raw_pointer.
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SILValue stripIndexingInsts(SILValue V);
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/// Returns the underlying value after stripping off a builtin expect
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/// intrinsic call.
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SILValue stripExpectIntrinsic(SILValue V);
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/// A utility class for evaluating whether a newly parsed or deserialized
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/// function has qualified or unqualified ownership.
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///
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/// The reason that we are using this is that we would like to avoid needing to
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/// add code to the SILParser or to the Serializer to support this temporary
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/// staging concept of a function having qualified or unqualified
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/// ownership. Once SemanticARC is complete, SILFunctions will always have
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/// qualified ownership, so the notion of an unqualified ownership function will
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/// no longer exist.
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///
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/// Thus we note that there are three sets of instructions in SIL from an
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/// ownership perspective:
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///
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/// a. ownership qualified instructions
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/// b. ownership unqualified instructions
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/// c. instructions that do not have ownership semantics (think literals,
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/// geps, etc).
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///
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/// The set of functions can be split into ownership qualified and ownership
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/// unqualified using the rules that:
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///
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/// a. a function can never contain both ownership qualified and ownership
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/// unqualified instructions.
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/// b. a function that contains only instructions without ownership semantics
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/// is considered ownership qualified.
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///
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/// Thus we can know when parsing/serializing what category of function we have
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/// and set the bit appropriately.
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class FunctionOwnershipEvaluator {
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NullablePtr<SILFunction> F;
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bool HasOwnershipQualifiedInstruction = false;
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public:
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FunctionOwnershipEvaluator() {}
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FunctionOwnershipEvaluator(SILFunction *F) : F(F) {}
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void reset(SILFunction *NewF) {
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F = NewF;
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HasOwnershipQualifiedInstruction = false;
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}
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bool evaluate(SILInstruction *I);
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};
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} // end namespace swift
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#endif
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