Merge pull request #66408 from al45tair/eng/PR-110261712-5.9

[Backtracing][Linux] Add support for Linux in the _Backtracing module.

Author: al45tair

include/swift/Runtime/Backtrace.h

@@ -134,7 +134,8 @@ struct BacktraceSettings {
 
 SWIFT_RUNTIME_STDLIB_INTERNAL BacktraceSettings _swift_backtraceSettings;
 
-SWIFT_RUNTIME_STDLIB_SPI SWIFT_CC(swift) bool _swift_isThunkFunction(const char *mangledName);
+SWIFT_RUNTIME_STDLIB_SPI
+bool _swift_backtrace_isThunkFunction(const char *mangledName);
 
 /// Try to demangle a symbol.
 ///
@@ -145,7 +146,6 @@ SWIFT_RUNTIME_STDLIB_SPI SWIFT_CC(swift) bool _swift_isThunkFunction(const char
 /// @param outputBuffer is a pointer to a buffer in which to place the result.
 /// @param outputBufferSize points to a variable that contains the size of the
 /// output buffer.
-/// @param status returns the status codes defined in the C++ ABI.
 ///
 /// If outputBuffer is nullptr, the function will allocate memory for the
 /// result using malloc().  In this case, outputBufferSize may be nullptr;
@@ -167,8 +167,7 @@ SWIFT_RUNTIME_STDLIB_SPI
 char *_swift_backtrace_demangle(const char *mangledName,
                                 size_t mangledNameLength,
                                 char *outputBuffer,
-                                size_t *outputBufferSize,
-                                int *status);
+                                size_t *outputBufferSize);
 #ifdef __cplusplus
 } // namespace backtrace
 } // namespace runtime

stdlib/public/Backtracing/ArrayImageSource.swift

@@ -0,0 +1,50 @@
+//===--- ArrayImageSource.swift - An image source backed by an Array -------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2023 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+//
+// Defines ArrayImageSource, an image source that is backed by a Swift Array.
+//
+//===----------------------------------------------------------------------===//
+
+import Swift
+
+@_implementationOnly import OS.Libc
+
+enum ArrayImageSourceError: Error {
+  case outOfBoundsRead(UInt64, UInt64)
+}
+
+struct ArrayImageSource<T>: ImageSource {
+  private var array: Array<T>
+
+  public init(array: Array<T>) {
+    self.array = array
+  }
+
+  public var isMappedImage: Bool { return false }
+  public var path: String? { return nil }
+  public var bounds: Bounds? {
+    return Bounds(base: 0, size: Size(array.count * MemoryLayout<T>.stride))
+  }
+
+  public func fetch<U>(from addr: Address,
+                       into buffer: UnsafeMutableBufferPointer<U>) throws {
+    try array.withUnsafeBytes{
+      let size = Size($0.count)
+      let requested = Size(buffer.count * MemoryLayout<U>.stride)
+      if addr > size || requested > size - addr {
+        throw ArrayImageSourceError.outOfBoundsRead(addr, requested)
+      }
+
+      memcpy(buffer.baseAddress!, $0.baseAddress! + Int(addr), Int(requested))
+    }
+  }
+}