1 files changed, 267 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/common/system_utils.cpp b/gfx/angle/checkout/src/common/system_utils.cpp
new file mode 100644
index 0000000000..89b632bc17
--- /dev/null
+++ b/gfx/angle/checkout/src/common/system_utils.cpp
@@ -0,0 +1,267 @@
+//
+// Copyright 2018 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// system_utils.cpp: Implementation of common functions
+
+#include "common/system_utils.h"
+#include "common/debug.h"
+
+#include <stdlib.h>
+#include <atomic>
+
+#if defined(ANGLE_PLATFORM_ANDROID)
+#    include <sys/system_properties.h>
+#endif
+
+#if defined(ANGLE_PLATFORM_APPLE)
+#    include <dispatch/dispatch.h>
+#    include <pthread.h>
+#endif
+
+namespace angle
+{
+std::string GetExecutableName()
+{
+#if defined(ANGLE_PLATFORM_ANDROID) && __ANDROID_API__ >= 21
+    // Support for "getprogname" function in bionic was introduced in L (API level 21)
+    const char *executableName = getprogname();
+    return (executableName) ? std::string(executableName) : "ANGLE";
+#else
+    std::string executableName = GetExecutablePath();
+    size_t lastPathSepLoc      = executableName.find_last_of(GetPathSeparator());
+    return (lastPathSepLoc > 0 ? executableName.substr(lastPathSepLoc + 1, executableName.length())
+                               : "ANGLE");
+#endif  // ANGLE_PLATFORM_ANDROID
+}
+
+// On Android return value cached in the process environment, if none, call
+// GetEnvironmentVarOrUnCachedAndroidProperty if not in environment.
+std::string GetEnvironmentVarOrAndroidProperty(const char *variableName, const char *propertyName)
+{
+#if defined(ANGLE_PLATFORM_ANDROID) && __ANDROID_API__ >= 21
+    // Can't use GetEnvironmentVar here because that won't allow us to distinguish between the
+    // environment being set to an empty string vs. not set at all.
+    const char *variableValue = getenv(variableName);
+    if (variableValue != nullptr)
+    {
+        std::string value(variableValue);
+        return value;
+    }
+#endif
+    return GetEnvironmentVarOrUnCachedAndroidProperty(variableName, propertyName);
+}
+
+// On Android call out to 'getprop' on a shell to get an Android property.  On desktop, return
+// the value of the environment variable.
+std::string GetEnvironmentVarOrUnCachedAndroidProperty(const char *variableName,
+                                                       const char *propertyName)
+{
+#if defined(ANGLE_PLATFORM_ANDROID) && __ANDROID_API__ >= 26
+    std::string propertyValue;
+
+    const prop_info *propertyInfo = __system_property_find(propertyName);
+    if (propertyInfo != nullptr)
+    {
+        __system_property_read_callback(
+            propertyInfo,
+            [](void *cookie, const char *, const char *value, unsigned) {
+                auto propertyValue = reinterpret_cast<std::string *>(cookie);
+                *propertyValue     = value;
+            },
+            &propertyValue);
+    }
+
+    return propertyValue;
+#else
+    // Return the environment variable's value.
+    return GetEnvironmentVar(variableName);
+#endif  // ANGLE_PLATFORM_ANDROID
+}
+
+// Look up a property and add it to the application's environment.
+// Adding to the env is a performance optimization, as getting properties is expensive.
+// This should only be used in non-Release paths, i.e. when using FrameCapture or DebugUtils.
+// It can cause race conditions in stress testing. See http://anglebug.com/6822
+std::string GetAndSetEnvironmentVarOrUnCachedAndroidProperty(const char *variableName,
+                                                             const char *propertyName)
+{
+    std::string value = GetEnvironmentVarOrUnCachedAndroidProperty(variableName, propertyName);
+
+#if defined(ANGLE_PLATFORM_ANDROID)
+    if (!value.empty())
+    {
+        // Set the environment variable with the value to improve future lookups (avoids
+        SetEnvironmentVar(variableName, value.c_str());
+    }
+#endif
+
+    return value;
+}
+
+bool GetBoolEnvironmentVar(const char *variableName)
+{
+    std::string envVarString = GetEnvironmentVar(variableName);
+    return (!envVarString.empty() && envVarString == "1");
+}
+
+bool PrependPathToEnvironmentVar(const char *variableName, const char *path)
+{
+    std::string oldValue = GetEnvironmentVar(variableName);
+    const char *newValue = nullptr;
+    std::string buf;
+    if (oldValue.empty())
+    {
+        newValue = path;
+    }
+    else
+    {
+        buf = path;
+        buf += GetPathSeparatorForEnvironmentVar();
+        buf += oldValue;
+        newValue = buf.c_str();
+    }
+    return SetEnvironmentVar(variableName, newValue);
+}
+
+bool IsFullPath(std::string dirName)
+{
+    if (dirName.find(GetRootDirectory()) == 0)
+    {
+        return true;
+    }
+    return false;
+}
+
+std::string ConcatenatePath(std::string first, std::string second)
+{
+    if (first.empty())
+    {
+        return second;
+    }
+    if (second.empty())
+    {
+        return first;
+    }
+    if (IsFullPath(second))
+    {
+        return second;
+    }
+    bool firstRedundantPathSeparator = first.find_last_of(GetPathSeparator()) == first.length() - 1;
+    bool secondRedundantPathSeparator = second.find(GetPathSeparator()) == 0;
+    if (firstRedundantPathSeparator && secondRedundantPathSeparator)
+    {
+        return first + second.substr(1);
+    }
+    else if (firstRedundantPathSeparator || secondRedundantPathSeparator)
+    {
+        return first + second;
+    }
+    return first + GetPathSeparator() + second;
+}
+
+Optional<std::string> CreateTemporaryFile()
+{
+    const Optional<std::string> tempDir = GetTempDirectory();
+    if (!tempDir.valid())
+        return Optional<std::string>::Invalid();
+
+    return CreateTemporaryFileInDirectory(tempDir.value());
+}
+
+PageFaultHandler::PageFaultHandler(PageFaultCallback callback) : mCallback(callback) {}
+PageFaultHandler::~PageFaultHandler() {}
+
+Library *OpenSharedLibrary(const char *libraryName, SearchType searchType)
+{
+    void *libraryHandle = OpenSystemLibraryAndGetError(libraryName, searchType, nullptr);
+    return new Library(libraryHandle);
+}
+
+Library *OpenSharedLibraryWithExtension(const char *libraryName, SearchType searchType)
+{
+    void *libraryHandle =
+        OpenSystemLibraryWithExtensionAndGetError(libraryName, searchType, nullptr);
+    return new Library(libraryHandle);
+}
+
+Library *OpenSharedLibraryAndGetError(const char *libraryName,
+                                      SearchType searchType,
+                                      std::string *errorOut)
+{
+    void *libraryHandle = OpenSystemLibraryAndGetError(libraryName, searchType, errorOut);
+    return new Library(libraryHandle);
+}
+
+Library *OpenSharedLibraryWithExtensionAndGetError(const char *libraryName,
+                                                   SearchType searchType,
+                                                   std::string *errorOut)
+{
+    void *libraryHandle =
+        OpenSystemLibraryWithExtensionAndGetError(libraryName, searchType, errorOut);
+    return new Library(libraryHandle);
+}
+
+void *OpenSystemLibrary(const char *libraryName, SearchType searchType)
+{
+    return OpenSystemLibraryAndGetError(libraryName, searchType, nullptr);
+}
+
+void *OpenSystemLibraryWithExtension(const char *libraryName, SearchType searchType)
+{
+    return OpenSystemLibraryWithExtensionAndGetError(libraryName, searchType, nullptr);
+}
+
+void *OpenSystemLibraryAndGetError(const char *libraryName,
+                                   SearchType searchType,
+                                   std::string *errorOut)
+{
+    std::string libraryWithExtension = std::string(libraryName) + "." + GetSharedLibraryExtension();
+#if ANGLE_PLATFORM_IOS
+    // On iOS, libraryWithExtension is a directory in which the library resides.
+    // The actual library name doesn't have an extension at all.
+    // E.g. "libEGL.framework/libEGL"
+    libraryWithExtension = libraryWithExtension + "/" + libraryName;
+#endif
+    return OpenSystemLibraryWithExtensionAndGetError(libraryWithExtension.c_str(), searchType,
+                                                     errorOut);
+}
+
+std::string StripFilenameFromPath(const std::string &path)
+{
+    size_t lastPathSepLoc = path.find_last_of("\\/");
+    return (lastPathSepLoc != std::string::npos) ? path.substr(0, lastPathSepLoc) : "";
+}
+
+static std::atomic<uint64_t> globalThreadSerial(1);
+
+#if defined(ANGLE_PLATFORM_APPLE)
+// https://anglebug.com/6479, similar to egl::GetCurrentThread() in libGLESv2/global_state.cpp
+uint64_t GetCurrentThreadUniqueId()
+{
+    static pthread_key_t tlsIndex;
+    static dispatch_once_t once;
+    dispatch_once(&once, ^{
+      ASSERT(pthread_key_create(&tlsIndex, nullptr) == 0);
+    });
+
+    void *tlsValue = pthread_getspecific(tlsIndex);
+    if (tlsValue == nullptr)
+    {
+        uint64_t threadId = globalThreadSerial++;
+        ASSERT(pthread_setspecific(tlsIndex, reinterpret_cast<void *>(threadId)) == 0);
+        return threadId;
+    }
+    return reinterpret_cast<uint64_t>(tlsValue);
+}
+#else
+uint64_t GetCurrentThreadUniqueId()
+{
+    thread_local uint64_t threadId(globalThreadSerial++);
+    return threadId;
+}
+#endif
+
+}  // namespace angle