Add basic runtime-plugins support.
This allows one to pass shared-libraries on the command line that the
runtime will load as plugins. They have access to runtime code and can
install hooks to add functionality. Currently the only hook they can
touch is JavaVMExt::AddEnvironmentHook to register a callback for
GetEnv(). More hooks might be added in the future.
Test: ./test/run-test 900
Change-Id: I852b4daf5a3fa71e9888722bc07794632c0e5010
diff --git a/test/900-hello-plugin/load_unload.cc b/test/900-hello-plugin/load_unload.cc
index 3315a86..a38cc3d 100644
--- a/test/900-hello-plugin/load_unload.cc
+++ b/test/900-hello-plugin/load_unload.cc
@@ -23,10 +23,41 @@
namespace art {
-extern "C" JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM* vm ATTRIBUTE_UNUSED,
+constexpr jint TEST_900_ENV_VERSION_NUMBER = 0x900FFFFF;
+constexpr uintptr_t ENV_VALUE = 900;
+
+// Allow this library to be used as a plugin too so we can test the stack.
+static jint GetEnvHandler(JavaVMExt* vm ATTRIBUTE_UNUSED, void** new_env, jint version) {
+ printf("%s called in test 900\n", __func__);
+ if (version != TEST_900_ENV_VERSION_NUMBER) {
+ return JNI_EVERSION;
+ }
+ printf("GetEnvHandler called with version 0x%x\n", version);
+ *new_env = reinterpret_cast<void*>(ENV_VALUE);
+ return JNI_OK;
+}
+
+extern "C" bool ArtPlugin_Initialize() {
+ printf("%s called in test 900\n", __func__);
+ Runtime::Current()->GetJavaVM()->AddEnvironmentHook(GetEnvHandler);
+ return true;
+}
+
+extern "C" bool ArtPlugin_Deinitialize() {
+ printf("%s called in test 900\n", __func__);
+ return true;
+}
+
+extern "C" JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM* vm,
char* options,
void* reserved ATTRIBUTE_UNUSED) {
printf("Agent_OnLoad called with options \"%s\"\n", options);
+ uintptr_t env = 0;
+ jint res = vm->GetEnv(reinterpret_cast<void**>(&env), TEST_900_ENV_VERSION_NUMBER);
+ if (res != JNI_OK) {
+ printf("GetEnv(TEST_900_ENV_VERSION_NUMBER) returned non-zero\n");
+ }
+ printf("GetEnv returned '%" PRIdPTR "' environment!\n", env);
return 0;
}