1 files changed, 196 insertions, 0 deletions
diff --git a/widget/cocoa/nsCocoaFeatures.mm b/widget/cocoa/nsCocoaFeatures.mm
new file mode 100644
index 0000000000..5f1138baf0
--- /dev/null
+++ b/widget/cocoa/nsCocoaFeatures.mm
@@ -0,0 +1,196 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// This file makes some assumptions about the versions of macOS.
+// We are assuming that the major, minor and bugfix versions are each less than
+// 256.
+// There are MOZ_ASSERTs for that.
+
+// The formula for the version integer is (major << 16) + (minor << 8) + bugfix.
+
+#define MACOS_VERSION_MASK 0x00FFFFFF
+#define MACOS_MAJOR_VERSION_MASK 0x00FFFFFF
+#define MACOS_MINOR_VERSION_MASK 0x00FFFFFF
+#define MACOS_BUGFIX_VERSION_MASK 0x00FFFFFF
+#define MACOS_VERSION_10_0_HEX 0x000A0000
+#define MACOS_VERSION_10_9_HEX 0x000A0900
+#define MACOS_VERSION_10_10_HEX 0x000A0A00
+#define MACOS_VERSION_10_11_HEX 0x000A0B00
+#define MACOS_VERSION_10_12_HEX 0x000A0C00
+#define MACOS_VERSION_10_13_HEX 0x000A0D00
+#define MACOS_VERSION_10_14_HEX 0x000A0E00
+#define MACOS_VERSION_10_15_HEX 0x000A0F00
+#define MACOS_VERSION_10_16_HEX 0x000A1000
+#define MACOS_VERSION_11_0_HEX 0x000B0000
+
+#include "nsCocoaFeatures.h"
+#include "nsCocoaUtils.h"
+#include "nsDebug.h"
+#include "nsObjCExceptions.h"
+
+#import <Cocoa/Cocoa.h>
+#include <sys/sysctl.h>
+
+/*static*/ int32_t nsCocoaFeatures::mOSVersion = 0;
+
+// This should not be called with unchecked aMajor, which should be >= 10.
+inline int32_t AssembleVersion(int32_t aMajor, int32_t aMinor, int32_t aBugFix) {
+  MOZ_ASSERT(aMajor >= 10);
+  return (aMajor << 16) + (aMinor << 8) + aBugFix;
+}
+
+int32_t nsCocoaFeatures::ExtractMajorVersion(int32_t aVersion) {
+  MOZ_ASSERT((aVersion & MACOS_VERSION_MASK) == aVersion);
+  return (aVersion & 0xFF0000) >> 16;
+}
+
+int32_t nsCocoaFeatures::ExtractMinorVersion(int32_t aVersion) {
+  MOZ_ASSERT((aVersion & MACOS_VERSION_MASK) == aVersion);
+  return (aVersion & 0xFF00) >> 8;
+}
+
+int32_t nsCocoaFeatures::ExtractBugFixVersion(int32_t aVersion) {
+  MOZ_ASSERT((aVersion & MACOS_VERSION_MASK) == aVersion);
+  return aVersion & 0xFF;
+}
+
+static int intAtStringIndex(NSArray* array, int index) {
+  return [(NSString*)[array objectAtIndex:index] integerValue];
+}
+
+void nsCocoaFeatures::GetSystemVersion(int& major, int& minor, int& bugfix) {
+  major = minor = bugfix = 0;
+
+  NSString* versionString = [[NSDictionary
+      dictionaryWithContentsOfFile:@"/System/Library/CoreServices/SystemVersion.plist"]
+      objectForKey:@"ProductVersion"];
+  if (!versionString) {
+    NS_ERROR("Couldn't read /System/Library/CoreServices/SystemVersion.plist to determine macOS "
+             "version.");
+    return;
+  }
+  NSArray* versions = [versionString componentsSeparatedByString:@"."];
+  NSUInteger count = [versions count];
+  if (count > 0) {
+    major = intAtStringIndex(versions, 0);
+    if (count > 1) {
+      minor = intAtStringIndex(versions, 1);
+      if (count > 2) {
+        bugfix = intAtStringIndex(versions, 2);
+      }
+    }
+  }
+}
+
+int32_t nsCocoaFeatures::GetVersion(int32_t aMajor, int32_t aMinor, int32_t aBugFix) {
+  int32_t macOSVersion;
+  if (aMajor < 10) {
+    aMajor = 10;
+    NS_ERROR("Couldn't determine macOS version, assuming 10.9");
+    macOSVersion = MACOS_VERSION_10_9_HEX;
+  } else if (aMajor == 10 && aMinor < 9) {
+    aMinor = 9;
+    NS_ERROR("macOS version too old, assuming 10.9");
+    macOSVersion = MACOS_VERSION_10_9_HEX;
+  } else {
+    MOZ_ASSERT(aMajor >= 10);
+    MOZ_ASSERT(aMajor < 256);
+    MOZ_ASSERT(aMinor >= 0);
+    MOZ_ASSERT(aMinor < 256);
+    MOZ_ASSERT(aBugFix >= 0);
+    MOZ_ASSERT(aBugFix < 256);
+    macOSVersion = AssembleVersion(aMajor, aMinor, aBugFix);
+  }
+  MOZ_ASSERT(aMajor == ExtractMajorVersion(macOSVersion));
+  MOZ_ASSERT(aMinor == ExtractMinorVersion(macOSVersion));
+  MOZ_ASSERT(aBugFix == ExtractBugFixVersion(macOSVersion));
+  return macOSVersion;
+}
+
+/*static*/ void nsCocoaFeatures::InitializeVersionNumbers() {
+  NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
+
+  // Provide an autorelease pool to avoid leaking Cocoa objects,
+  // as this gets called before the main autorelease pool is in place.
+  nsAutoreleasePool localPool;
+
+  int major, minor, bugfix;
+  GetSystemVersion(major, minor, bugfix);
+  mOSVersion = GetVersion(major, minor, bugfix);
+
+  NS_OBJC_END_TRY_ABORT_BLOCK;
+}
+
+/* static */ int32_t nsCocoaFeatures::macOSVersion() {
+  // Don't let this be called while we're first setting the value...
+  MOZ_ASSERT((mOSVersion & MACOS_VERSION_MASK) >= 0);
+  if (!mOSVersion) {
+    mOSVersion = -1;
+    InitializeVersionNumbers();
+  }
+  return mOSVersion;
+}
+
+/* static */ int32_t nsCocoaFeatures::macOSVersionMajor() {
+  return ExtractMajorVersion(macOSVersion());
+}
+
+/* static */ int32_t nsCocoaFeatures::macOSVersionMinor() {
+  return ExtractMinorVersion(macOSVersion());
+}
+
+/* static */ int32_t nsCocoaFeatures::macOSVersionBugFix() {
+  return ExtractBugFixVersion(macOSVersion());
+}
+
+/* static */ bool nsCocoaFeatures::OnSierraExactly() {
+  return (macOSVersion() >= MACOS_VERSION_10_12_HEX) && (macOSVersion() < MACOS_VERSION_10_13_HEX);
+}
+
+/* Version of OnSierraExactly as global function callable from cairo & skia */
+bool Gecko_OnSierraExactly() { return nsCocoaFeatures::OnSierraExactly(); }
+
+/* static */ bool nsCocoaFeatures::OnHighSierraOrLater() {
+  return (macOSVersion() >= MACOS_VERSION_10_13_HEX);
+}
+
+/* static */ bool nsCocoaFeatures::OnMojaveOrLater() {
+  return (macOSVersion() >= MACOS_VERSION_10_14_HEX);
+}
+
+/* static */ bool nsCocoaFeatures::OnCatalinaOrLater() {
+  return (macOSVersion() >= MACOS_VERSION_10_15_HEX);
+}
+
+/* static */ bool nsCocoaFeatures::OnBigSurOrLater() {
+  // Account for the version being 10.16 (which occurs when the
+  // application is linked with an older SDK) or 11.0 on Big Sur.
+  return ((macOSVersion() >= MACOS_VERSION_10_16_HEX) ||
+          (macOSVersion() >= MACOS_VERSION_11_0_HEX));
+}
+
+/* static */ bool nsCocoaFeatures::IsAtLeastVersion(int32_t aMajor, int32_t aMinor,
+                                                    int32_t aBugFix) {
+  return macOSVersion() >= GetVersion(aMajor, aMinor, aBugFix);
+}
+
+/*
+ * Returns true if the process is running under Rosetta translation. Returns
+ * false if running natively or if an error was encountered. We use the
+ * `sysctl.proc_translated` sysctl which is documented by Apple to be used
+ * for this purpose. Note: using this in a sandboxed process requires allowing
+ * the sysctl in the sandbox policy.
+ */
+/* static */ bool nsCocoaFeatures::ProcessIsRosettaTranslated() {
+  int ret = 0;
+  size_t size = sizeof(ret);
+  if (sysctlbyname("sysctl.proc_translated", &ret, &size, NULL, 0) == -1) {
+    if (errno != ENOENT) {
+      fprintf(stderr, "Failed to check for translation environment\n");
+    }
+    return false;
+  }
+  return (ret == 1);
+}