Add a SWIFT_RUNTIME_MACHO_NO_DYLD stdlib mode that doesn't dynamically look up sections in modules, and only assumes a single static module (#33441)

stdlib/public/runtime/ImageInspectionStatic.cpp

@@ -0,0 +1,77 @@
+//===--- ImageInspectionStatic.cpp - image inspection for static stdlib ---===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2017 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+///
+/// Implementation of ImageInspection for static stdlib (no dynamic loader
+/// present) environments. Assumes that only a single image exists in memory.
+///
+//===----------------------------------------------------------------------===//
+
+#if defined(__MACH__) && defined(SWIFT_RUNTIME_MACHO_NO_DYLD)
+
+#include "ImageInspection.h"
+#include "ImageInspectionCommon.h"
+
+using namespace swift;
+
+#define GET_SECTION_START_AND_SIZE(start, size, _seg, _sec)                    \
+  extern void *__s##_seg##_sec __asm("section$start$" _seg "$" _sec);          \
+  extern void *__e##_seg##_sec __asm("section$end$" _seg "$" _sec);            \
+  start = &__s##_seg##_sec;                                                    \
+  size = (char *)&__e##_seg##_sec - (char *)&__s##_seg##_sec;
+
+void swift::initializeProtocolLookup() {
+  void *start;
+  uintptr_t size;
+  GET_SECTION_START_AND_SIZE(start, size, TextSegment, ProtocolsSection);
+  if (start == nullptr || size == 0)
+    return;
+  addImageProtocolsBlockCallbackUnsafe(start, size);
+}
+
+void swift::initializeProtocolConformanceLookup() {
+  void *start;
+  uintptr_t size;
+  GET_SECTION_START_AND_SIZE(start, size, TextSegment,
+                             ProtocolConformancesSection);
+  if (start == nullptr || size == 0)
+    return;
+  addImageProtocolConformanceBlockCallbackUnsafe(start, size);
+}
+void swift::initializeTypeMetadataRecordLookup() {
+  void *start;
+  uintptr_t size;
+  GET_SECTION_START_AND_SIZE(start, size, TextSegment,
+                             TypeMetadataRecordSection);
+  if (start == nullptr || size == 0)
+    return;
+  addImageTypeMetadataRecordBlockCallbackUnsafe(start, size);
+}
+
+void swift::initializeDynamicReplacementLookup() {
+  void *start1;
+  uintptr_t size1;
+  GET_SECTION_START_AND_SIZE(start1, size1, TextSegment,
+                             DynamicReplacementSection);
+  if (start1 == nullptr || size1 == 0)
+    return;
+  void *start2;
+  uintptr_t size2;
+  GET_SECTION_START_AND_SIZE(start2, size2, TextSegment,
+                             DynamicReplacementSection);
+  if (start2 == nullptr || size2 == 0)
+    return;
+  addImageDynamicReplacementBlockCallback(start1, size1, start2, size2);
+}
+
+#endif // defined(__MACH__) && defined(SWIFT_RUNTIME_MACHO_NO_DYLD)