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f61366be57
Calling `abort` takes us a few layers deep into libc before we crash, which overwrites a bunch of register state. Instead, we trap directly within swift_unreachable, and mark it always-inline, to hopefully keep the full register state intact when we generate a crash log from this.
47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
//===--- Unreachable.h - Implements swift_unreachable ---*- 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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// This file defines swift_unreachable, which provides the
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// functionality of llvm_unreachable without necessarily depending on
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// the LLVM support libraries.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_BASIC_UNREACHABLE_H
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#define SWIFT_BASIC_UNREACHABLE_H
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#ifdef SWIFT_LLVM_SUPPORT_IS_AVAILABLE
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// The implementation when LLVM is available.
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#include "llvm/Support/ErrorHandling.h"
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#define swift_unreachable llvm_unreachable
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#else
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// The implementation when LLVM is not available.
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#include <assert.h>
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#include <stdlib.h>
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#include "swift/Runtime/Config.h"
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SWIFT_RUNTIME_ATTRIBUTE_NORETURN SWIFT_ALWAYS_INLINE
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inline static void swift_unreachable(const char *msg) {
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(void)msg;
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SWIFT_RUNTIME_BUILTIN_TRAP;
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}
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#endif
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#endif
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