6714758: hotspot: provide an entry point to the BootStrap Class loader[dholmes,acorn]

Adds JVM_FindClassFromBootLoader entry point, for jdk's use

Reviewed-by: dholmes, acorn

hotspot/make/linux/makefiles/mapfile-vers-debug

@@ -89,6 +89,7 @@ SUNWprivate_1.1 {
                 JVM_FillInStackTrace;
                 JVM_FindClassFromClass;
                 JVM_FindClassFromClassLoader;
+                JVM_FindClassFromBootLoader;
                 JVM_FindLibraryEntry;
                 JVM_FindLoadedClass;
                 JVM_FindPrimitiveClass;

hotspot/make/linux/makefiles/mapfile-vers-product

@@ -89,6 +89,7 @@ SUNWprivate_1.1 {
                 JVM_FillInStackTrace;
                 JVM_FindClassFromClass;
                 JVM_FindClassFromClassLoader;
+                JVM_FindClassFromBootLoader;
                 JVM_FindLibraryEntry;
                 JVM_FindLoadedClass;
                 JVM_FindPrimitiveClass;

hotspot/make/solaris/makefiles/mapfile-vers

@@ -89,6 +89,7 @@ SUNWprivate_1.1 {
 		JVM_FillInStackTrace;
 		JVM_FindClassFromClass;
 		JVM_FindClassFromClassLoader;
+		JVM_FindClassFromBootLoader;
 		JVM_FindLibraryEntry;
 		JVM_FindLoadedClass;
 		JVM_FindPrimitiveClass;

hotspot/make/solaris/makefiles/reorder_COMPILER1_i486

@@ -2175,6 +2175,7 @@ text: .text%__1cQjava_lang_StringGlength6FpnHoopDesc__i_;
 text: .text%jni_GetStringUTFRegion: jni.o;
 text: .text%__1cQjava_lang_StringOas_utf8_string6FpnHoopDesc_ii_pc_;
 text: .text%JVM_FindClassFromClassLoader;
+text: .text%JVM_FindClassFromBootLoader;
 text: .text%JVM_IsInterface;
 text: .text%JVM_GetClassDeclaredConstructors;
 text: .text%__1cNmethodOopDescOis_initializer6kM_i_;

hotspot/make/solaris/makefiles/reorder_COMPILER1_sparc

@@ -1500,6 +1500,7 @@ text: .text%__1cQjava_lang_StringGlength6FpnHoopDesc__i_;
 text: .text%jni_GetStringUTFRegion: jni.o;
 text: .text%__1cQjava_lang_StringOas_utf8_string6FpnHoopDesc_ii_pc_;
 text: .text%JVM_FindClassFromClassLoader;
+text: .text%JVM_FindClassFromBootLoader;
 text: .text%JVM_IsInterface;
 text: .text%JVM_GetClassDeclaredConstructors;
 text: .text%__1cNmethodOopDescOis_initializer6kM_i_;

hotspot/make/solaris/makefiles/reorder_COMPILER2_amd64

@@ -4339,6 +4339,7 @@ text: .text%__1cSComputeAdapterInfoIdo_float6M_v_;
 text: .text%__1cFParseLarray_store6MnJBasicType__v_;
 text: .text%__1cOmangle_name_on6FpnMoutputStream_pnNsymbolOopDesc_ii_v_: nativeLookup.o;
 text: .text%JVM_FindClassFromClassLoader;
+text: .text%JVM_FindClassFromBootLoader;
 text: .text%__1cZCallInterpreterDirectNodeSalignment_required6kM_i_;
 text: .text%__1cZCallInterpreterDirectNodePoper_input_base6kM_I_;
 text: .text%__1cZCallInterpreterDirectNodeEemit6kMrnKCodeBuffer_pnNPhaseRegAlloc__v_;

hotspot/make/solaris/makefiles/reorder_COMPILER2_i486

@@ -4755,6 +4755,7 @@ text: .text%__1cbCAbstractInterpreterGeneratorVgenerate_and_dispatch6MpnITemplat
 text: .text%__1cITemplateKinitialize6MinITosState_1pFi_vi_v_;
 text: .text%__1cNTemplateTableDdef6FnJBytecodesECode_inITosState_3pFi_vi_v_;
 text: .text%JVM_FindClassFromClassLoader;
+text: .text%JVM_FindClassFromBootLoader;
 text: .text%__1cPshrI_eReg_1NodeEsize6kMpnNPhaseRegAlloc__I_;
 text: .text%__1cHi2bNodeMideal_Opcode6kM_i_: ad_i486_misc.o;
 text: .text%__1cMmatch_option6FpknMJavaVMOption_pkcp4_i_: arguments.o;

hotspot/make/solaris/makefiles/reorder_COMPILER2_sparc

@@ -3713,6 +3713,7 @@ text: .text%__1cITemplateKinitialize6MinITosState_1pFi_vi_v_;
 text: .text%__1cITemplateIgenerate6MpnZInterpreterMacroAssembler__v_;
 text: .text%__1cQregI_to_stkINodeHis_Copy6kM_I_: ad_sparc_misc.o;
 text: .text%JVM_FindClassFromClassLoader;
+text: .text%JVM_FindClassFromBootLoader;
 text: .text%signalHandler;
 text: .text%__1cTtypeArrayKlassKlassIoop_size6kMpnHoopDesc__i_: typeArrayKlassKlass.o;
 text: .text%JVM_handle_solaris_signal;

hotspot/make/solaris/makefiles/reorder_COMPILER2_sparcv9

@@ -3735,6 +3735,7 @@ text: .text%__1cITemplateKinitialize6MinITosState_1pFi_vi_v_;
 text: .text%__1cQjava_lang_ThreadRget_thread_status6FpnHoopDesc__n0AMThreadStatus__;
 text: .text%__1cIMulINodeGadd_id6kM_pknEType__: classes.o;
 text: .text%JVM_FindClassFromClassLoader;
+text: .text%JVM_FindClassFromBootLoader;
 text: .text%__1cHTypePtrFempty6kM_i_;
 text: .text%__1cQaddP_reg_regNodeEsize6kMpnNPhaseRegAlloc__I_;
 text: .text%__1cbFunnecessary_membar_volatileNodePoper_input_base6kM_I_: ad_sparc_misc.o;

hotspot/make/solaris/makefiles/reorder_TIERED_amd64

@@ -4339,6 +4339,7 @@ text: .text%__1cSComputeAdapterInfoIdo_float6M_v_;
 text: .text%__1cFParseLarray_store6MnJBasicType__v_;
 text: .text%__1cOmangle_name_on6FpnMoutputStream_pnNsymbolOopDesc_ii_v_: nativeLookup.o;
 text: .text%JVM_FindClassFromClassLoader;
+text: .text%JVM_FindClassFromBootLoader;
 text: .text%__1cZCallInterpreterDirectNodeSalignment_required6kM_i_;
 text: .text%__1cZCallInterpreterDirectNodePoper_input_base6kM_I_;
 text: .text%__1cZCallInterpreterDirectNodeEemit6kMrnKCodeBuffer_pnNPhaseRegAlloc__v_;

hotspot/make/solaris/makefiles/reorder_TIERED_i486

@@ -4755,6 +4755,7 @@ text: .text%__1cbCAbstractInterpreterGeneratorVgenerate_and_dispatch6MpnITemplat
 text: .text%__1cITemplateKinitialize6MinITosState_1pFi_vi_v_;
 text: .text%__1cNTemplateTableDdef6FnJBytecodesECode_inITosState_3pFi_vi_v_;
 text: .text%JVM_FindClassFromClassLoader;
+text: .text%JVM_FindClassFromBootLoader;
 text: .text%__1cPshrI_eReg_1NodeEsize6kMpnNPhaseRegAlloc__I_;
 text: .text%__1cHi2bNodeMideal_Opcode6kM_i_: ad_i486_misc.o;
 text: .text%__1cMmatch_option6FpknMJavaVMOption_pkcp4_i_: arguments.o;

hotspot/make/solaris/makefiles/reorder_TIERED_sparc

@@ -3713,6 +3713,7 @@ text: .text%__1cITemplateKinitialize6MinITosState_1pFi_vi_v_;
 text: .text%__1cITemplateIgenerate6MpnZInterpreterMacroAssembler__v_;
 text: .text%__1cQregI_to_stkINodeHis_Copy6kM_I_: ad_sparc_misc.o;
 text: .text%JVM_FindClassFromClassLoader;
+text: .text%JVM_FindClassFromBootLoader;
 text: .text%signalHandler;
 text: .text%__1cTtypeArrayKlassKlassIoop_size6kMpnHoopDesc__i_: typeArrayKlassKlass.o;
 text: .text%JVM_handle_solaris_signal;

hotspot/make/windows/makefiles/vm.make

@@ -88,13 +88,20 @@ AGCT_EXPORT=/export:AsyncGetCallTrace
 !endif
 !endif
 
-LINK_FLAGS=$(LINK_FLAGS) $(STACK_SIZE) /subsystem:windows /dll /base:0x8000000  \
+LINK_FLAGS=$(LINK_FLAGS) $(STACK_SIZE) /subsystem:windows /dll /base:0x8000000 \
-  /export:JNI_GetDefaultJavaVMInitArgs /export:JNI_CreateJavaVM    \
+  /export:JNI_GetDefaultJavaVMInitArgs       \
-  /export:JNI_GetCreatedJavaVMs /export:jio_snprintf               \
+  /export:JNI_CreateJavaVM                   \
-  /export:jio_printf /export:jio_fprintf                           \
+  /export:JVM_FindClassFromBootLoader        \
-  /export:jio_vfprintf /export:jio_vsnprintf $(AGCT_EXPORT)        \
+  /export:JNI_GetCreatedJavaVMs              \
-  /export:JVM_GetVersionInfo \
+  /export:jio_snprintf                       \
-  /export:JVM_GetThreadStateNames /export:JVM_GetThreadStateValues \
+  /export:jio_printf                         \
+  /export:jio_fprintf                        \
+  /export:jio_vfprintf                       \
+  /export:jio_vsnprintf                      \
+  $(AGCT_EXPORT)                             \
+  /export:JVM_GetVersionInfo                 \
+  /export:JVM_GetThreadStateNames            \
+  /export:JVM_GetThreadStateValues           \
   /export:JVM_InitAgentProperties
 
 CPP_INCLUDE_DIRS=\

hotspot/src/share/vm/prims/jvm.cpp

@@ -624,6 +624,30 @@ JVM_ENTRY(void, JVM_ResolveClass(JNIEnv* env, jclass cls))
   if (PrintJVMWarnings) warning("JVM_ResolveClass not implemented");
 JVM_END
 
+// Rationale behind JVM_FindClassFromBootLoader
+// a> JVM_FindClassFromClassLoader was never exported in the export tables.
+// b> because of (a) java.dll has a direct dependecy on the  unexported
+//    private symbol "_JVM_FindClassFromClassLoader@20".
+// c> the launcher cannot use the private symbol as it dynamically opens
+//    the entry point, so if something changes, the launcher will fail
+//    unexpectedly at runtime, it is safest for the launcher to dlopen a
+//    stable exported interface.
+// d> re-exporting JVM_FindClassFromClassLoader as public, will cause its
+//    signature to change from _JVM_FindClassFromClassLoader@20 to
+//    JVM_FindClassFromClassLoader and will not be backward compatible
+//    with older JDKs.
+// Thus a public/stable exported entry point is the right solution,
+// public here means public in linker semantics, and is exported only
+// to the JDK, and is not intended to be a public API.
+
+JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
+                                              const char* name,
+                                              jboolean throwError))
+  JVMWrapper3("JVM_FindClassFromBootLoader %s throw %s", name,
+              throwError ? "error" : "exception");
+  return JVM_FindClassFromClassLoader(env, name, JNI_FALSE,
+                                      (jobject)NULL, throwError);
+JVM_END
 
 JVM_ENTRY(jclass, JVM_FindClassFromClassLoader(JNIEnv* env, const char* name,
                                                jboolean init, jobject loader,

hotspot/src/share/vm/prims/jvm.h

@@ -389,6 +389,17 @@ JNIEXPORT jclass JNICALL
 JVM_FindClassFromClassLoader(JNIEnv *env, const char *name, jboolean init,
                              jobject loader, jboolean throwError);
 
+/*
+ * Find a class from a boot class loader. Throw ClassNotFoundException
+ * or NoClassDefFoundError depending on the value of the last
+ * argument. This is the same as FindClassFromClassLoader but provided
+ * as a convenience method exported correctly on all platforms for
+ * JSR 277 launcher class loading.
+ */
+JNIEXPORT jclass JNICALL
+JVM_FindClassFromBootLoader(JNIEnv *env, const char *name,
+                            jboolean throwError);
+
 /*
  * Find a class from a given class.
  */