[cxx-interop] [nfc] Remove swift namespace from SwiftShims in C++ mode. (#32715)

Most SwiftShims were put in the swift namespace in C++ mode which broke certain things when importing them in a swift file in C++ mode. This was OK when they were only imported as part of the swift runtime but, now they are used in C++ mode both in the swift runtime and when C++ interop is enabled.

This broke when C++ interop was enabled because the `Swift` module contains references to symbols in the SwiftShims headers which are built without C++ interop enabled (no "swift" namespace). But, when C++ interop is enabled, the SwiftShims headers would put everything in the swift namespace meaning the symbols couldn't be found in the global namespace. Then, the compiler would error when trying to deserialize the Swift module.

Author: zoecarver

stdlib/public/SwiftShims/AssertionReporting.h

@@ -21,7 +21,7 @@
 #endif
 
 #ifdef __cplusplus
-namespace swift { extern "C" {
+extern "C" {
 #endif
 
 /// Report a fatal error to system console, stderr, and crash logs.
@@ -69,7 +69,7 @@ void _swift_stdlib_reportUnimplementedInitializer(
     __swift_uint32_t flags);
 
 #ifdef __cplusplus
-}} // extern "C", namespace swift
+} // extern "C"
 #endif
 
 #if __has_feature(nullability)

stdlib/public/SwiftShims/CoreFoundationShims.h

@@ -23,7 +23,7 @@
 #include "Visibility.h"
 
 #ifdef __cplusplus
-namespace swift { extern "C" {
+extern "C" {
 #endif
 
 #ifdef __OBJC2__
@@ -78,7 +78,7 @@ _swift_stdlib_dyld_is_objc_constant_string(const void * _Nonnull addr);
 #endif // __OBJC2__
 
 #ifdef __cplusplus
-}} // extern "C", namespace swift
+} // extern "C"
 #endif
 
 #endif // SWIFT_STDLIB_SHIMS_COREFOUNDATIONSHIMS_H

stdlib/public/SwiftShims/DispatchOverlayShims.h

@@ -32,7 +32,7 @@
 #pragma clang assume_nonnull begin
 
 #ifdef __cplusplus
-namespace swift { extern "C" {
+extern "C" {
 #endif
 
 typedef void (^__swift_shims_dispatch_block_t)(void);
@@ -251,7 +251,7 @@ static inline void _swift_dispatch_release(dispatch_object_t object) {
 }
 
 #ifdef __cplusplus
-}} // extern "C", namespace swift
+} // extern "C"
 #endif
 
 #pragma clang assume_nonnull end

stdlib/public/SwiftShims/FoundationShims.h

@@ -30,7 +30,7 @@
 #include "SwiftStdint.h"
 
 #ifdef __cplusplus
-namespace swift { extern "C" {
+extern "C" {
 #endif
 
 typedef struct {
@@ -58,7 +58,7 @@ SWIFT_RUNTIME_STDLIB_API
 _SwiftNSOperatingSystemVersion _swift_stdlib_operatingSystemVersion() __attribute__((const));
 
 #ifdef __cplusplus
-}} // extern "C", namespace swift
+} // extern "C"
 #endif
 
 #endif // SWIFT_STDLIB_SHIMS_FOUNDATIONSHIMS_H

stdlib/public/SwiftShims/LibcShims.h

@@ -29,7 +29,7 @@
 #endif
 
 #ifdef __cplusplus
-namespace swift { extern "C" {
+extern "C" {
 #endif
 
 // This declaration might not be universally correct.
@@ -184,7 +184,7 @@ long double lgammal_r(long double x, int *psigngam);
 #endif // defined(__APPLE__)
 
 #ifdef __cplusplus
-}} // extern "C", namespace swift
+} // extern "C"
 #endif
 
 #if __has_feature(nullability)

stdlib/public/SwiftShims/Random.h

@@ -25,14 +25,14 @@
 #endif
 
 #ifdef __cplusplus
-namespace swift { extern "C" {
+extern "C" {
 #endif
 
 SWIFT_RUNTIME_STDLIB_API
 void swift_stdlib_random(void *buf, __swift_size_t nbytes);
 
 #ifdef __cplusplus
-}} // extern "C", namespace swift
+} // extern "C"
 #endif
 
 #if __has_feature(nullability)

stdlib/public/SwiftShims/RuntimeShims.h

@@ -23,7 +23,7 @@
 #include "Visibility.h"
 
 #ifdef __cplusplus
-namespace swift { extern "C" {
+extern "C" {
 #endif
 
 /// Return an NSString to be used as the Mirror summary of the object
@@ -85,7 +85,7 @@ __swift_size_t _swift_stdlib_getHardwareConcurrency(void);
 #define _swift_MinAllocationAlignment (__swift_size_t) 16
 
 #ifdef __cplusplus
-}} // extern "C", namespace swift
+} // extern "C"
 #endif
 
 #endif // SWIFT_STDLIB_SHIMS_RUNTIMESHIMS_H

stdlib/public/SwiftShims/RuntimeStubs.h

@@ -22,7 +22,7 @@
 #include "LibcShims.h"
 
 #ifdef __cplusplus
-namespace swift { extern "C" {
+extern "C" {
 #endif
 
 SWIFT_BEGIN_NULLABILITY_ANNOTATIONS
@@ -42,7 +42,7 @@ _swift_stdlib_overrideUnsafeArgvArgc(char * _Nullable * _Nonnull argv, int argc)
 SWIFT_END_NULLABILITY_ANNOTATIONS
 
 #ifdef __cplusplus
-}} // extern "C", namespace swift
+} // extern "C"
 #endif
 
 #endif // SWIFT_STDLIB_SHIMS_RUNTIMESTUBS_H_

stdlib/public/SwiftShims/UnicodeShims.h

@@ -26,7 +26,7 @@
 #endif
 
 #ifdef __cplusplus
-namespace swift { extern "C" {
+extern "C" {
 #endif
 
 SWIFT_RUNTIME_STDLIB_API
@@ -554,7 +554,7 @@ double __swift_stdlib_u_getNumericValue(__swift_stdlib_UChar32 c);
 
 
 #ifdef __cplusplus
-}} // extern "C", namespace swift
+} // extern "C"
 #endif
 
 #if __has_feature(nullability)

stdlib/public/runtime/BackDeployment.cpp

@@ -30,7 +30,7 @@ _swift_classIsSwiftMask = computeIsSwiftMask();
 SWIFT_ALLOWED_RUNTIME_GLOBAL_CTOR_END
 #endif // SWIFT_CLASS_IS_SWIFT_MASK_GLOBAL_VARIABLE
 
-static swift::_SwiftNSOperatingSystemVersion swiftInOSVersion = {
+static _SwiftNSOperatingSystemVersion swiftInOSVersion = {
 #if __MAC_OS_X_VERSION_MIN_REQUIRED
   10, 14, 4
 // WatchOS also pretends to be iOS, so check it first.
@@ -43,8 +43,8 @@ static swift::_SwiftNSOperatingSystemVersion swiftInOSVersion = {
 #endif
 };
 
-static bool versionLessThan(swift::_SwiftNSOperatingSystemVersion lhs,
-                            swift::_SwiftNSOperatingSystemVersion rhs) {
+static bool versionLessThan(_SwiftNSOperatingSystemVersion lhs,
+                            _SwiftNSOperatingSystemVersion rhs) {
   if (lhs.majorVersion < rhs.majorVersion) return true;
   if (lhs.majorVersion > rhs.majorVersion) return false;
 
@@ -58,7 +58,7 @@ static bool versionLessThan(swift::_SwiftNSOperatingSystemVersion lhs,
 
 SWIFT_RUNTIME_STDLIB_INTERNAL
 int _swift_isBackDeploying() {
-  auto version = swift::_swift_stdlib_operatingSystemVersion();
+  auto version = _swift_stdlib_operatingSystemVersion();
   return versionLessThan(version, swiftInOSVersion);
 }
 #endif

stdlib/public/stubs/Assert.cpp

@@ -39,7 +39,7 @@ static void logPrefixAndMessageToDebugger(
   free(debuggerMessage);
 }
 
-void swift::_swift_stdlib_reportFatalErrorInFile(
+void _swift_stdlib_reportFatalErrorInFile(
     const unsigned char *prefix, int prefixLength,
     const unsigned char *message, int messageLength,
     const unsigned char *file, int fileLength,
@@ -61,7 +61,7 @@ void swift::_swift_stdlib_reportFatalErrorInFile(
   logPrefixAndMessageToDebugger(prefix, prefixLength, message, messageLength);
 }
 
-void swift::_swift_stdlib_reportFatalError(
+void _swift_stdlib_reportFatalError(
     const unsigned char *prefix, int prefixLength,
     const unsigned char *message, int messageLength,
     uint32_t flags
@@ -78,7 +78,7 @@ void swift::_swift_stdlib_reportFatalError(
   logPrefixAndMessageToDebugger(prefix, prefixLength, message, messageLength);
 }
 
-void swift::_swift_stdlib_reportUnimplementedInitializerInFile(
+void _swift_stdlib_reportUnimplementedInitializerInFile(
     const unsigned char *className, int classNameLength,
     const unsigned char *initName, int initNameLength,
     const unsigned char *file, int fileLength,
@@ -99,7 +99,7 @@ void swift::_swift_stdlib_reportUnimplementedInitializerInFile(
   free(log);
 }
 
-void swift::_swift_stdlib_reportUnimplementedInitializer(
+void _swift_stdlib_reportUnimplementedInitializer(
     const unsigned char *className, int classNameLength,
     const unsigned char *initName, int initNameLength,
     uint32_t flags

stdlib/public/stubs/Availability.mm

@@ -47,7 +47,7 @@ static os_system_version_s getOSVersion() {
 /// This is ABI and cannot be removed. Even though _stdlib_isOSVersionAtLeast()
 /// is no longer inlinable, is previously was and so calls to this method
 /// have been inlined into shipped apps.
-_SwiftNSOperatingSystemVersion swift::_swift_stdlib_operatingSystemVersion() {
+_SwiftNSOperatingSystemVersion _swift_stdlib_operatingSystemVersion() {
   os_system_version_s version = SWIFT_LAZY_CONSTANT(getOSVersion());
 
   return { (int)version.major, (int)version.minor, (int)version.patch };

stdlib/public/stubs/FoundationHelpers.mm

@@ -66,26 +66,26 @@ static inline void initializeBridgingFunctions() {
 }
 
 __swift_uint8_t
-swift::_swift_stdlib_isNSString(id obj) {
+_swift_stdlib_isNSString(id obj) {
   initializeBridgingFunctions();
   return _CFGetTypeID((CFTypeRef)obj) == _CFStringTypeID ? 1 : 0;
 }
 
 _swift_shims_CFHashCode
-swift::_swift_stdlib_CFStringHashNSString(id _Nonnull obj) {
+_swift_stdlib_CFStringHashNSString(id _Nonnull obj) {
   initializeBridgingFunctions();
   return _CFStringHashNSString(obj);
 }
 
 _swift_shims_CFHashCode
-swift::_swift_stdlib_CFStringHashCString(const _swift_shims_UInt8 * _Nonnull bytes,
+_swift_stdlib_CFStringHashCString(const _swift_shims_UInt8 * _Nonnull bytes,
                                   _swift_shims_CFIndex length) {
   initializeBridgingFunctions();
   return _CFStringHashCString(bytes, length);
 }
 
 const __swift_uint8_t *
-swift::_swift_stdlib_NSStringCStringUsingEncodingTrampoline(id _Nonnull obj,
+_swift_stdlib_NSStringCStringUsingEncodingTrampoline(id _Nonnull obj,
                                                   unsigned long encoding) {
   typedef __swift_uint8_t * _Nullable (*cStrImplPtr)(id, SEL, unsigned long);
   cStrImplPtr imp = (cStrImplPtr)class_getMethodImplementation([obj superclass],
@@ -94,7 +94,7 @@ static inline void initializeBridgingFunctions() {
 }
 
 __swift_uint8_t
-swift::_swift_stdlib_NSStringGetCStringTrampoline(id _Nonnull obj,
+_swift_stdlib_NSStringGetCStringTrampoline(id _Nonnull obj,
                                          _swift_shims_UInt8 *buffer,
                                          _swift_shims_CFIndex maxLength,
                                          unsigned long encoding) {
@@ -111,7 +111,7 @@ typedef __swift_uint8_t (*getCStringImplPtr)(id,
 }
 
 __swift_uint8_t
-swift::_swift_stdlib_dyld_is_objc_constant_string(const void *addr) {
+_swift_stdlib_dyld_is_objc_constant_string(const void *addr) {
   initializeBridgingFunctions();
   if (!dyld_is_objc_constant) return false;
   return dyld_is_objc_constant(dyld_objc_string_kind, addr) ? 1 : 0;

stdlib/public/stubs/GlobalObjects.cpp

@@ -118,8 +118,8 @@ static swift::_SwiftHashingParameters initializeHashingParameters() {
     return { 0, 0, true };
   }
   __swift_uint64_t seed0 = 0, seed1 = 0;
-  swift::swift_stdlib_random(&seed0, sizeof(seed0));
-  swift::swift_stdlib_random(&seed1, sizeof(seed1));
+  swift_stdlib_random(&seed0, sizeof(seed0));
+  swift_stdlib_random(&seed1, sizeof(seed1));
   return { seed0, seed1, false };
 }
 

stdlib/public/stubs/LibcShims.cpp

@@ -31,15 +31,13 @@
 
 #include "../SwiftShims/LibcShims.h"
 
-using namespace swift;
-
 #if !defined(_WIN32) || defined(__CYGWIN__)
-static_assert(std::is_same<mode_t, swift::__swift_mode_t>::value,
+static_assert(std::is_same<mode_t, __swift_mode_t>::value,
               "__swift_mode_t must be defined as equivalent to mode_t in LibcShims.h");
 #endif
 
 SWIFT_RUNTIME_STDLIB_INTERNAL
-int swift::_swift_stdlib_putchar_unlocked(int c) {
+int _swift_stdlib_putchar_unlocked(int c) {
 #if defined(_WIN32)
   return _putc_nolock(c, stdout);
 #else
@@ -48,15 +46,15 @@ int swift::_swift_stdlib_putchar_unlocked(int c) {
 }
 
 SWIFT_RUNTIME_STDLIB_INTERNAL
-__swift_size_t swift::_swift_stdlib_fwrite_stdout(const void *ptr,
+__swift_size_t _swift_stdlib_fwrite_stdout(const void *ptr,
                                                   __swift_size_t size,
                                                   __swift_size_t nitems) {
     return fwrite(ptr, size, nitems, stdout);
 }
 
 SWIFT_RUNTIME_STDLIB_SPI
 __swift_ssize_t
-swift::_swift_stdlib_read(int fd, void *buf, __swift_size_t nbyte) {
+_swift_stdlib_read(int fd, void *buf, __swift_size_t nbyte) {
 #if defined(_WIN32)
   return _read(fd, buf, nbyte);
 #else
@@ -66,7 +64,7 @@ swift::_swift_stdlib_read(int fd, void *buf, __swift_size_t nbyte) {
 
 SWIFT_RUNTIME_STDLIB_SPI
 __swift_ssize_t
-swift::_swift_stdlib_write(int fd, const void *buf, __swift_size_t nbyte) {
+_swift_stdlib_write(int fd, const void *buf, __swift_size_t nbyte) {
 #if defined(_WIN32)
   return _write(fd, buf, nbyte);
 #else
@@ -75,7 +73,7 @@ swift::_swift_stdlib_write(int fd, const void *buf, __swift_size_t nbyte) {
 }
 
 SWIFT_RUNTIME_STDLIB_SPI
-int swift::_swift_stdlib_close(int fd) {
+int _swift_stdlib_close(int fd) {
 #if defined(_WIN32)
   return _close(fd);
 #else

stdlib/public/stubs/Random.cpp

@@ -44,18 +44,20 @@
 
 #include <algorithm> // required for std::min
 
+using namespace swift;
+
 #if defined(__APPLE__)
 
 SWIFT_RUNTIME_STDLIB_API
-void swift::swift_stdlib_random(void *buf, __swift_size_t nbytes) {
+void swift_stdlib_random(void *buf, __swift_size_t nbytes) {
   arc4random_buf(buf, nbytes);
 }
 
 #elif defined(_WIN32) && !defined(__CYGWIN__)
 #warning TODO: Test swift_stdlib_random on Windows
 
 SWIFT_RUNTIME_STDLIB_API
-void swift::swift_stdlib_random(void *buf, __swift_size_t nbytes) {
+void swift_stdlib_random(void *buf, __swift_size_t nbytes) {
   if (nbytes > ULONG_MAX) {
     fatalError(0, "Fatal error: %zd exceeds ULONG_MAX\n", nbytes);
   }
@@ -79,7 +81,7 @@ void swift::swift_stdlib_random(void *buf, __swift_size_t nbytes) {
 }())
 
 SWIFT_RUNTIME_STDLIB_API
-void swift::swift_stdlib_random(void *buf, __swift_size_t nbytes) {
+void swift_stdlib_random(void *buf, __swift_size_t nbytes) {
   while (nbytes > 0) {
     __swift_ssize_t actual_nbytes = -1;