forked from OSchip/llvm-project
325 lines
11 KiB
C
325 lines
11 KiB
C
//===-- os_version_check.c - OS version checking -------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the function __isOSVersionAtLeast, used by
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// Objective-C's @available
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//
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//===----------------------------------------------------------------------===//
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#ifdef __APPLE__
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#include <TargetConditionals.h>
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#include <dispatch/dispatch.h>
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#include <dlfcn.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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// These three variables hold the host's OS version.
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static int32_t GlobalMajor, GlobalMinor, GlobalSubminor;
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static dispatch_once_t DispatchOnceCounter;
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static dispatch_once_t CompatibilityDispatchOnceCounter;
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// _availability_version_check darwin API support.
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typedef uint32_t dyld_platform_t;
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typedef struct {
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dyld_platform_t platform;
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uint32_t version;
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} dyld_build_version_t;
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typedef bool (*AvailabilityVersionCheckFuncTy)(uint32_t count,
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dyld_build_version_t versions[]);
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static AvailabilityVersionCheckFuncTy AvailabilityVersionCheck;
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// We can't include <CoreFoundation/CoreFoundation.h> directly from here, so
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// just forward declare everything that we need from it.
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typedef const void *CFDataRef, *CFAllocatorRef, *CFPropertyListRef,
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*CFStringRef, *CFDictionaryRef, *CFTypeRef, *CFErrorRef;
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#if __LLP64__
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typedef unsigned long long CFTypeID;
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typedef unsigned long long CFOptionFlags;
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typedef signed long long CFIndex;
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#else
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typedef unsigned long CFTypeID;
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typedef unsigned long CFOptionFlags;
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typedef signed long CFIndex;
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#endif
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typedef unsigned char UInt8;
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typedef _Bool Boolean;
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typedef CFIndex CFPropertyListFormat;
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typedef uint32_t CFStringEncoding;
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// kCFStringEncodingASCII analog.
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#define CF_STRING_ENCODING_ASCII 0x0600
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// kCFStringEncodingUTF8 analog.
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#define CF_STRING_ENCODING_UTF8 0x08000100
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#define CF_PROPERTY_LIST_IMMUTABLE 0
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typedef CFDataRef (*CFDataCreateWithBytesNoCopyFuncTy)(CFAllocatorRef,
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const UInt8 *, CFIndex,
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CFAllocatorRef);
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typedef CFPropertyListRef (*CFPropertyListCreateWithDataFuncTy)(
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CFAllocatorRef, CFDataRef, CFOptionFlags, CFPropertyListFormat *,
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CFErrorRef *);
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typedef CFPropertyListRef (*CFPropertyListCreateFromXMLDataFuncTy)(
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CFAllocatorRef, CFDataRef, CFOptionFlags, CFStringRef *);
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typedef CFStringRef (*CFStringCreateWithCStringNoCopyFuncTy)(CFAllocatorRef,
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const char *,
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CFStringEncoding,
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CFAllocatorRef);
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typedef const void *(*CFDictionaryGetValueFuncTy)(CFDictionaryRef,
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const void *);
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typedef CFTypeID (*CFGetTypeIDFuncTy)(CFTypeRef);
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typedef CFTypeID (*CFStringGetTypeIDFuncTy)(void);
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typedef Boolean (*CFStringGetCStringFuncTy)(CFStringRef, char *, CFIndex,
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CFStringEncoding);
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typedef void (*CFReleaseFuncTy)(CFTypeRef);
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static void _initializeAvailabilityCheck(bool LoadPlist) {
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if (AvailabilityVersionCheck && !LoadPlist) {
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// New API is supported and we're not being asked to load the plist,
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// exit early!
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return;
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}
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// Use the new API if it's is available.
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AvailabilityVersionCheck = (AvailabilityVersionCheckFuncTy)dlsym(
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RTLD_DEFAULT, "_availability_version_check");
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if (AvailabilityVersionCheck && !LoadPlist) {
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// New API is supported and we're not being asked to load the plist,
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// exit early!
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return;
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}
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// Still load the PLIST to ensure that the existing calls to
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// __isOSVersionAtLeast still work even with new compiler-rt and old OSes.
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// Load CoreFoundation dynamically
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const void *NullAllocator = dlsym(RTLD_DEFAULT, "kCFAllocatorNull");
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if (!NullAllocator)
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return;
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const CFAllocatorRef AllocatorNull = *(const CFAllocatorRef *)NullAllocator;
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CFDataCreateWithBytesNoCopyFuncTy CFDataCreateWithBytesNoCopyFunc =
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(CFDataCreateWithBytesNoCopyFuncTy)dlsym(RTLD_DEFAULT,
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"CFDataCreateWithBytesNoCopy");
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if (!CFDataCreateWithBytesNoCopyFunc)
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return;
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CFPropertyListCreateWithDataFuncTy CFPropertyListCreateWithDataFunc =
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(CFPropertyListCreateWithDataFuncTy)dlsym(RTLD_DEFAULT,
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"CFPropertyListCreateWithData");
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// CFPropertyListCreateWithData was introduced only in macOS 10.6+, so it
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// will be NULL on earlier OS versions.
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wdeprecated-declarations"
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CFPropertyListCreateFromXMLDataFuncTy CFPropertyListCreateFromXMLDataFunc =
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(CFPropertyListCreateFromXMLDataFuncTy)dlsym(
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RTLD_DEFAULT, "CFPropertyListCreateFromXMLData");
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#pragma clang diagnostic pop
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// CFPropertyListCreateFromXMLDataFunc is deprecated in macOS 10.10, so it
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// might be NULL in future OS versions.
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if (!CFPropertyListCreateWithDataFunc && !CFPropertyListCreateFromXMLDataFunc)
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return;
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CFStringCreateWithCStringNoCopyFuncTy CFStringCreateWithCStringNoCopyFunc =
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(CFStringCreateWithCStringNoCopyFuncTy)dlsym(
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RTLD_DEFAULT, "CFStringCreateWithCStringNoCopy");
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if (!CFStringCreateWithCStringNoCopyFunc)
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return;
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CFDictionaryGetValueFuncTy CFDictionaryGetValueFunc =
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(CFDictionaryGetValueFuncTy)dlsym(RTLD_DEFAULT, "CFDictionaryGetValue");
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if (!CFDictionaryGetValueFunc)
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return;
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CFGetTypeIDFuncTy CFGetTypeIDFunc =
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(CFGetTypeIDFuncTy)dlsym(RTLD_DEFAULT, "CFGetTypeID");
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if (!CFGetTypeIDFunc)
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return;
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CFStringGetTypeIDFuncTy CFStringGetTypeIDFunc =
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(CFStringGetTypeIDFuncTy)dlsym(RTLD_DEFAULT, "CFStringGetTypeID");
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if (!CFStringGetTypeIDFunc)
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return;
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CFStringGetCStringFuncTy CFStringGetCStringFunc =
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(CFStringGetCStringFuncTy)dlsym(RTLD_DEFAULT, "CFStringGetCString");
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if (!CFStringGetCStringFunc)
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return;
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CFReleaseFuncTy CFReleaseFunc =
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(CFReleaseFuncTy)dlsym(RTLD_DEFAULT, "CFRelease");
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if (!CFReleaseFunc)
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return;
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char *PListPath = "/System/Library/CoreServices/SystemVersion.plist";
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#if TARGET_OS_SIMULATOR
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char *PListPathPrefix = getenv("IPHONE_SIMULATOR_ROOT");
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if (!PListPathPrefix)
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return;
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char FullPath[strlen(PListPathPrefix) + strlen(PListPath) + 1];
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strcpy(FullPath, PListPathPrefix);
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strcat(FullPath, PListPath);
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PListPath = FullPath;
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#endif
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FILE *PropertyList = fopen(PListPath, "r");
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if (!PropertyList)
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return;
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// Dynamically allocated stuff.
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CFDictionaryRef PListRef = NULL;
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CFDataRef FileContentsRef = NULL;
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UInt8 *PListBuf = NULL;
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fseek(PropertyList, 0, SEEK_END);
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long PListFileSize = ftell(PropertyList);
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if (PListFileSize < 0)
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goto Fail;
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rewind(PropertyList);
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PListBuf = malloc((size_t)PListFileSize);
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if (!PListBuf)
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goto Fail;
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size_t NumRead = fread(PListBuf, 1, (size_t)PListFileSize, PropertyList);
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if (NumRead != (size_t)PListFileSize)
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goto Fail;
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// Get the file buffer into CF's format. We pass in a null allocator here *
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// because we free PListBuf ourselves
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FileContentsRef = (*CFDataCreateWithBytesNoCopyFunc)(
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NULL, PListBuf, (CFIndex)NumRead, AllocatorNull);
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if (!FileContentsRef)
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goto Fail;
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if (CFPropertyListCreateWithDataFunc)
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PListRef = (*CFPropertyListCreateWithDataFunc)(
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NULL, FileContentsRef, CF_PROPERTY_LIST_IMMUTABLE, NULL, NULL);
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else
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PListRef = (*CFPropertyListCreateFromXMLDataFunc)(
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NULL, FileContentsRef, CF_PROPERTY_LIST_IMMUTABLE, NULL);
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if (!PListRef)
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goto Fail;
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CFStringRef ProductVersion = (*CFStringCreateWithCStringNoCopyFunc)(
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NULL, "ProductVersion", CF_STRING_ENCODING_ASCII, AllocatorNull);
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if (!ProductVersion)
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goto Fail;
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CFTypeRef OpaqueValue = (*CFDictionaryGetValueFunc)(PListRef, ProductVersion);
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(*CFReleaseFunc)(ProductVersion);
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if (!OpaqueValue ||
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(*CFGetTypeIDFunc)(OpaqueValue) != (*CFStringGetTypeIDFunc)())
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goto Fail;
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char VersionStr[32];
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if (!(*CFStringGetCStringFunc)((CFStringRef)OpaqueValue, VersionStr,
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sizeof(VersionStr), CF_STRING_ENCODING_UTF8))
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goto Fail;
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sscanf(VersionStr, "%d.%d.%d", &GlobalMajor, &GlobalMinor, &GlobalSubminor);
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Fail:
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if (PListRef)
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(*CFReleaseFunc)(PListRef);
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if (FileContentsRef)
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(*CFReleaseFunc)(FileContentsRef);
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free(PListBuf);
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fclose(PropertyList);
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}
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// Find and parse the SystemVersion.plist file.
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static void compatibilityInitializeAvailabilityCheck(void *Unused) {
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(void)Unused;
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_initializeAvailabilityCheck(/*LoadPlist=*/true);
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}
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static void initializeAvailabilityCheck(void *Unused) {
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(void)Unused;
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_initializeAvailabilityCheck(/*LoadPlist=*/false);
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}
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// This old API entry point is no longer used by Clang for Darwin. We still need
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// to keep it around to ensure that object files that reference it are still
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// usable when linked with new compiler-rt.
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int32_t __isOSVersionAtLeast(int32_t Major, int32_t Minor, int32_t Subminor) {
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// Populate the global version variables, if they haven't already.
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dispatch_once_f(&CompatibilityDispatchOnceCounter, NULL,
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compatibilityInitializeAvailabilityCheck);
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if (Major < GlobalMajor)
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return 1;
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if (Major > GlobalMajor)
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return 0;
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if (Minor < GlobalMinor)
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return 1;
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if (Minor > GlobalMinor)
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return 0;
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return Subminor <= GlobalSubminor;
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}
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static inline uint32_t ConstructVersion(uint32_t Major, uint32_t Minor,
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uint32_t Subminor) {
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return ((Major & 0xffff) << 16) | ((Minor & 0xff) << 8) | (Subminor & 0xff);
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}
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int32_t __isPlatformVersionAtLeast(uint32_t Platform, uint32_t Major,
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uint32_t Minor, uint32_t Subminor) {
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dispatch_once_f(&DispatchOnceCounter, NULL, initializeAvailabilityCheck);
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if (!AvailabilityVersionCheck) {
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return __isOSVersionAtLeast(Major, Minor, Subminor);
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}
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dyld_build_version_t Versions[] = {
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{Platform, ConstructVersion(Major, Minor, Subminor)}};
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return AvailabilityVersionCheck(1, Versions);
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}
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#elif __ANDROID__
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#include <pthread.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/system_properties.h>
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static int SdkVersion;
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static int IsPreRelease;
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static void readSystemProperties(void) {
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char buf[PROP_VALUE_MAX];
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if (__system_property_get("ro.build.version.sdk", buf) == 0) {
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// When the system property doesn't exist, defaults to future API level.
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SdkVersion = __ANDROID_API_FUTURE__;
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} else {
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SdkVersion = atoi(buf);
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}
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if (__system_property_get("ro.build.version.codename", buf) == 0) {
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IsPreRelease = 1;
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} else {
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IsPreRelease = strcmp(buf, "REL") != 0;
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}
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return;
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}
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int32_t __isOSVersionAtLeast(int32_t Major, int32_t Minor, int32_t Subminor) {
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(int32_t) Minor;
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(int32_t) Subminor;
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static pthread_once_t once = PTHREAD_ONCE_INIT;
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pthread_once(&once, readSystemProperties);
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return SdkVersion >= Major ||
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(IsPreRelease && Major == __ANDROID_API_FUTURE__);
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}
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#else
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// Silence an empty translation unit warning.
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typedef int unused;
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#endif
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