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comparison src/share/vm/oops/method.cpp @ 7176:59c790074993

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8003635: NPG: AsynchGetCallTrace broken by Method* virtual call Summary: Make metaspace::contains be lock free and used to see if something is in metaspace, also compare Method* with vtbl pointer. Reviewed-by: dholmes, sspitsyn, dcubed, jmasa
author coleenp
date Wed, 28 Nov 2012 17:50:21 -0500
parents 070d523b96a7
children 5505fbbae3d3
comparison
equal deleted inserted replaced
7175:b51dc8df86e5 7176:59c790074993
1810 } 1810 }
1811 1811
1812 // Called when the class loader is unloaded to make all methods weak. 1812 // Called when the class loader is unloaded to make all methods weak.
1813 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 1813 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
1814 loader_data->jmethod_ids()->clear_all_methods(); 1814 loader_data->jmethod_ids()->clear_all_methods();
1815 }
1816
1817
1818 // Check that this pointer is valid by checking that the vtbl pointer matches
1819 bool Method::is_valid_method() const {
1820 if (this == NULL) {
1821 return false;
1822 } else if (!is_metaspace_object()) {
1823 return false;
1824 } else {
1825 Method m;
1826 // This assumes that the vtbl pointer is the first word of a C++ object.
1827 // This assumption is also in universe.cpp patch_klass_vtble
1828 void* vtbl2 = dereference_vptr((void*)&m);
1829 void* this_vtbl = dereference_vptr((void*)this);
1830 return vtbl2 == this_vtbl;
1831 }
1815 } 1832 }
1816 1833
1817 #ifndef PRODUCT 1834 #ifndef PRODUCT
1818 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { 1835 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
1819 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 1836 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
1933 guarantee(constants()->is_metadata(), "should be metadata"); 1950 guarantee(constants()->is_metadata(), "should be metadata");
1934 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 1951 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
1935 guarantee(constMethod()->is_metadata(), "should be metadata"); 1952 guarantee(constMethod()->is_metadata(), "should be metadata");
1936 MethodData* md = method_data(); 1953 MethodData* md = method_data();
1937 guarantee(md == NULL || 1954 guarantee(md == NULL ||
1938 md->is_metadata(), "should be in permspace"); 1955 md->is_metadata(), "should be metadata");
1939 guarantee(md == NULL || 1956 guarantee(md == NULL ||
1940 md->is_methodData(), "should be method data"); 1957 md->is_methodData(), "should be method data");
1941 } 1958 }