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1d961ba22d
Although I don't plan to bring over new assertions wholesale into the current qualification branch, it's entirely possible that various minor changes in main will use the new assertions; having this basic support in the release branch will simplify that. (This is why I'm adding the includes as a separate pass from rewriting the individual assertions)
94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
//===--- JumpDest.h - Jump Destination Representation -----------*- 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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// Types relating to branch destinations.
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//
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//===----------------------------------------------------------------------===//
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#ifndef JUMPDEST_H
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#define JUMPDEST_H
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#include "swift/Basic/Assertions.h"
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#include "swift/SIL/SILLocation.h"
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#include "llvm/Support/Compiler.h"
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#include "Cleanup.h"
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namespace swift {
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class SILBasicBlock;
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class CaseStmt;
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namespace Lowering {
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struct LLVM_LIBRARY_VISIBILITY ThrownErrorInfo {
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SILValue IndirectErrorResult;
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bool Discard;
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explicit ThrownErrorInfo(SILValue indirectErrorAddr, bool discard=false)
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: IndirectErrorResult(indirectErrorAddr), Discard(discard) {}
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static ThrownErrorInfo forDiscard() {
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return ThrownErrorInfo(SILValue(), /*discard=*/true);
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}
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};
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/// The destination of a direct jump. Swift currently does not
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/// support indirect branches or goto, so the jump mechanism only
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/// needs to worry about branches out of scopes, not into them.
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class LLVM_LIBRARY_VISIBILITY JumpDest {
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SILBasicBlock *Block = nullptr;
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CleanupsDepth Depth = CleanupsDepth::invalid();
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CleanupLocation CleanupLoc;
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std::optional<ThrownErrorInfo> ThrownError;
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public:
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JumpDest(CleanupLocation L) : CleanupLoc(L) {}
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JumpDest(SILBasicBlock *block, CleanupsDepth depth, CleanupLocation l,
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std::optional<ThrownErrorInfo> ThrownError = std::nullopt)
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: Block(block), Depth(depth), CleanupLoc(l), ThrownError(ThrownError) {}
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SILBasicBlock *getBlock() const { return Block; }
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SILBasicBlock *takeBlock() {
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auto *BB = Block;
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Block = nullptr;
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return BB;
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}
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CleanupsDepth getDepth() const { return Depth; }
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CleanupLocation getCleanupLocation() const { return CleanupLoc; }
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ThrownErrorInfo getThrownError() const {
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assert(ThrownError);
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return *ThrownError;
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}
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JumpDest translate(CleanupsDepth NewDepth) && {
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assert(!ThrownError);
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JumpDest NewValue(Block, NewDepth, CleanupLoc);
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Block = nullptr;
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Depth = CleanupsDepth::invalid();
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// Null location.
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CleanupLoc = CleanupLocation(ArtificialUnreachableLocation());
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return NewValue;
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}
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bool isValid() const { return Block != nullptr; }
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static JumpDest invalid() {
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return JumpDest(CleanupLocation::invalid());
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}
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};
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} // end namespace Lowering
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} // end namespace swift
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#endif
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