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platform_system_core
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Add PreloadPublicNativeLibraries function 

Shift responsibility of preloading native libraries to the user
of the library. This lets applications that do not use jni but
depend on libnative_loader.so to avoid unnecessary preloads of
public libraries which could be expensive.

Bug: http://b/27245894
Change-Id: I12a8100de5da639c068769bca21ecebff2b2d538
This commit is contained in:
Dimitry Ivanov 2016-02-22 11:27:48 -08:00
parent b236ff7156
commit 426799d770
2 changed files with 11 additions and 4 deletions
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3
libnativeloader/include/nativeloader/native_loader.h
View File

@ -25,6 +25,9 @@
namespace android {
__attribute__((visibility("default")))
void PreloadPublicNativeLibraries();
__attribute__((visibility("default")))
void* OpenNativeLibrary(JNIEnv* env, int32_t target_sdk_version, const char* path,
jobject class_loader, bool is_shared, jstring library_path,

12
libnativeloader/native_loader.cpp
View File

@ -59,9 +59,7 @@ static const char* kPublicNativeLibraries = "libandroid.so:"
class LibraryNamespaces {
public:
LibraryNamespaces() : initialized_(false) {
PreloadPublicLibraries();
}
LibraryNamespaces() : initialized_(false) { }
android_namespace_t* GetOrCreate(JNIEnv* env, jobject class_loader,
bool is_shared,
@ -114,7 +112,6 @@ class LibraryNamespaces {
return it != namespaces_.end() ? it->second : nullptr;
}
private:
void PreloadPublicLibraries() {
// android_init_namespaces() expects all the public libraries
// to be loaded so that they can be found by soname alone.
@ -124,6 +121,7 @@ class LibraryNamespaces {
}
}
private:
bool InitPublicNamespace(const char* library_path, int32_t target_sdk_version) {
// Some apps call dlopen from generated code unknown to linker in which
// case linker uses anonymous namespace. See b/25844435 for details.
@ -151,6 +149,12 @@ class LibraryNamespaces {
static LibraryNamespaces* g_namespaces = new LibraryNamespaces;
#endif
void PreloadPublicNativeLibraries() {
#if defined(__ANDROID__)
g_namespaces->PreloadPublicLibraries();
#endif
}
void* OpenNativeLibrary(JNIEnv* env, int32_t target_sdk_version, const char* path,
jobject class_loader, bool is_shared, jstring java_library_path,