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

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Adds JVM_FindClassFromBootLoader entry point, for jdk's use

Reviewed-by: dholmes, acorn
This commit is contained in:
Kumar Srinivasan 2008-06-17 13:08:15 -07:00
parent cb8502a58c
commit 69eb2b72c6
15 changed files with 61 additions and 7 deletions
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24
hotspot/src/share/vm/prims/jvm.cpp
View file

@ -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,

11
hotspot/src/share/vm/prims/jvm.h
View file

@ -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.
*/