2135 
2136 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2137   if (mid == NULL) return NULL;
2138   Method* o = resolve_jmethod_id(mid);
2139   if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
2140     return NULL;
2141   }
2142   return o;
2143 };
2144 
2145 void Method::set_on_stack(const bool value) {
2146   // Set both the method itself and its constant pool.  The constant pool
2147   // on stack means some method referring to it is also on the stack.
2148   constants()->set_on_stack(value);
2149 
2150   bool already_set = on_stack();
2151   _access_flags.set_on_stack(value);
2152   if (value && !already_set) {
2153     MetadataOnStackMark::record(this);
2154   }


2155 }
2156 
2157 // Called when the class loader is unloaded to make all methods weak.
2158 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2159   loader_data->jmethod_ids()->clear_all_methods();
2160 }
2161 
2162 bool Method::has_method_vptr(const void* ptr) {
2163   Method m;
2164   // This assumes that the vtbl pointer is the first word of a C++ object.
2165   return dereference_vptr(&m) == dereference_vptr(ptr);
2166 }
2167 
2168 // Check that this pointer is valid by checking that the vtbl pointer matches
2169 bool Method::is_valid_method(const Method* m) {
2170   if (m == NULL) {
2171     return false;
2172   } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2173     // Quick sanity check on pointer.
2174     return false;

2135 
2136 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2137   if (mid == NULL) return NULL;
2138   Method* o = resolve_jmethod_id(mid);
2139   if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
2140     return NULL;
2141   }
2142   return o;
2143 };
2144 
2145 void Method::set_on_stack(const bool value) {
2146   // Set both the method itself and its constant pool.  The constant pool
2147   // on stack means some method referring to it is also on the stack.
2148   constants()->set_on_stack(value);
2149 
2150   bool already_set = on_stack();
2151   _access_flags.set_on_stack(value);
2152   if (value && !already_set) {
2153     MetadataOnStackMark::record(this);
2154   }
2155   assert(!value || !is_old() || is_obsolete() || is_running_emcp(),
2156          "emcp methods cannot run after emcp bit is cleared");
2157 }
2158 
2159 // Called when the class loader is unloaded to make all methods weak.
2160 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2161   loader_data->jmethod_ids()->clear_all_methods();
2162 }
2163 
2164 bool Method::has_method_vptr(const void* ptr) {
2165   Method m;
2166   // This assumes that the vtbl pointer is the first word of a C++ object.
2167   return dereference_vptr(&m) == dereference_vptr(ptr);
2168 }
2169 
2170 // Check that this pointer is valid by checking that the vtbl pointer matches
2171 bool Method::is_valid_method(const Method* m) {
2172   if (m == NULL) {
2173     return false;
2174   } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2175     // Quick sanity check on pointer.
2176     return false;