Bug 845804 - Reuse OpenTempFile from nsMemoryInfoDumper in nsCycleCollector.cpp. r=njn

xpcom/base/nsCycleCollector.cpp

@@ -123,6 +123,7 @@
 #include "nsIMemoryReporter.h"
 #include "nsIFile.h"
 #include "nsDirectoryServiceDefs.h"
+#include "nsMemoryInfoDumper.h"
 #include "xpcpublic.h"
 #include "nsXPCOMPrivate.h"
 #include "sampler.h"
@@ -1404,32 +1405,15 @@ private:
             mFilenameIdentifier.IsEmpty() ? "" : ".",
             NS_ConvertUTF16toUTF8(mFilenameIdentifier).get());
 
-        // Get the log directory either from $MOZ_CC_LOG_DIRECTORY or from our
-        // platform's temp directory. For Android, first try the downloads
-        // directory which is world-readable rather than the temp directory
-        // which is not.
+        // Get the log directory either from $MOZ_CC_LOG_DIRECTORY or from
+        // the fallback directories in OpenTempFile.
         nsCOMPtr<nsIFile> logFile;
-        char* env;
-        if (env = PR_GetEnv("MOZ_CC_LOG_DIRECTORY")) {
+        if (char* env = PR_GetEnv("MOZ_CC_LOG_DIRECTORY")) {
             NS_NewNativeLocalFile(nsCString(env), /* followLinks = */ true,
                                   getter_AddRefs(logFile));
         }
-#ifdef ANDROID
-        if (!logFile && (env = PR_GetEnv("DOWNLOADS_DIRECTORY"))) {
-            NS_NewNativeLocalFile(nsCString(env), /* followLinks = */ true,
-                                  getter_AddRefs(logFile));
-        }
-#endif
-        if (!logFile) {
-            // Ask NSPR to point us to the temp directory.
-            NS_GetSpecialDirectory(NS_OS_TEMP_DIR, getter_AddRefs(logFile));
-        }
-        NS_ENSURE_TRUE(logFile, nullptr);
-
-        nsresult rv = logFile->AppendNative(filename);
-        NS_ENSURE_SUCCESS(rv, nullptr);
-
-        rv = logFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0644);
+        nsresult rv = nsMemoryInfoDumper::OpenTempFile(filename,
+                                                       getter_AddRefs(logFile));
         NS_ENSURE_SUCCESS(rv, nullptr);
 
         return logFile.forget();

xpcom/base/nsMemoryInfoDumper.cpp

@@ -736,14 +736,17 @@ MakeFilename(const char *aPrefix, const nsAString &aIdentifier,
                             getpid(), aSuffix);
 }
 
-static nsresult
-OpenTempFile(const nsACString &aFilename, nsIFile* *aFile)
+/* static */ nsresult
+nsMemoryInfoDumper::OpenTempFile(const nsACString &aFilename, nsIFile* *aFile)
 {
 #ifdef ANDROID
   // For Android, first try the downloads directory which is world-readable
   // rather than the temp directory which is not.
-  if (char *env = PR_GetEnv("DOWNLOADS_DIRECTORY")) {
-    NS_NewNativeLocalFile(nsCString(env), /* followLinks = */ true, aFile);
+  if (!*aFile) {
+    char *env = PR_GetEnv("DOWNLOADS_DIRECTORY");
+    if (env) {
+      NS_NewNativeLocalFile(nsCString(env), /* followLinks = */ true, aFile);
+    }
   }
 #endif
   nsresult rv;

xpcom/base/nsMemoryInfoDumper.h

@@ -29,6 +29,15 @@ public:
 public:
   static void Initialize();
 
+  /**
+   * This function creates a new unique file based on |aFilename| in a
+   * world-readable temp directory. This is the system temp directory
+   * or, in the case of Android, the downloads directory. If |aFile| is
+   * non-null, it is assumed to point to a folder, and that folder is used
+   * instead.
+   */
+  static nsresult OpenTempFile(const nsACString &aFilename, nsIFile* *aFile);
+
 private:
   static nsresult
   DumpMemoryReportsToFileImpl(const nsAString& aIdentifier);