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7012087: JSR 292 Misleading exception message for a non-bound MH for a virtual method

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Improve error message formatting to give more information to user.  Also, catch a corner case related to 6930553 and 6844449.

Reviewed-by: kvn
This commit is contained in:
John R Rose 2011-04-07 17:12:21 -07:00
parent 16784a72e8
commit b95f04efbf
2 changed files with 26 additions and 8 deletions
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33
hotspot/src/share/vm/runtime/sharedRuntime.cpp
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@ -1700,9 +1700,11 @@ char* SharedRuntime::generate_wrong_method_type_message(JavaThread* thread,
message = generate_class_cast_message(objName, targetKlass->external_name());
} else {
// %%% need to get the MethodType string, without messing around too much
const char* desc = NULL;
// Get a signature from the invoke instruction
const char* mhName = "method handle";
const char* targetType = "the required signature";
int targetArity = -1, mhArity = -1;
vframeStream vfst(thread, true);
if (!vfst.at_end()) {
Bytecode_invoke call(vfst.method(), vfst.bci());
@ -1716,20 +1718,35 @@ char* SharedRuntime::generate_wrong_method_type_message(JavaThread* thread,
&& target->is_method_handle_invoke()
&& required == target->method_handle_type()) {
targetType = target->signature()->as_C_string();
targetArity = ArgumentCount(target->signature()).size();
}
}
klassOop kignore; int fignore;
methodOop actual_method = MethodHandles::decode_method(actual,
kignore, fignore);
klassOop kignore; int dmf_flags = 0;
methodOop actual_method = MethodHandles::decode_method(actual, kignore, dmf_flags);
if ((dmf_flags & ~(MethodHandles::_dmf_has_receiver |
MethodHandles::_dmf_does_dispatch |
MethodHandles::_dmf_from_interface)) != 0)
actual_method = NULL; // MH does extra binds, drops, etc.
bool has_receiver = ((dmf_flags & MethodHandles::_dmf_has_receiver) != 0);
if (actual_method != NULL) {
if (methodOopDesc::is_method_handle_invoke_name(actual_method->name()))
mhName = "$";
mhName = actual_method->signature()->as_C_string();
mhArity = ArgumentCount(actual_method->signature()).size();
if (!actual_method->is_static()) mhArity += 1;
} else if (java_lang_invoke_MethodHandle::is_instance(actual)) {
oopDesc* mhType = java_lang_invoke_MethodHandle::type(actual);
mhArity = java_lang_invoke_MethodType::ptype_count(mhType);
stringStream st;
java_lang_invoke_MethodType::print_signature(mhType, &st);
mhName = st.as_string();
}
if (targetArity != -1 && targetArity != mhArity) {
if (has_receiver && targetArity == mhArity-1)
desc = " cannot be called without a receiver argument as ";
else
mhName = actual_method->signature()->as_C_string();
if (mhName[0] == '$')
mhName = actual_method->signature()->as_C_string();
desc = " cannot be called with a different arity as ";
}
message = generate_class_cast_message(mhName, targetType,
desc != NULL ? desc :
" cannot be called as ");
}
if (TraceMethodHandles) {