正文
bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic);
// Check if there's a resolved klass containing the field
if (resolved_klass.is_null()) {
ResourceMark rm(THREAD);
THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
}
/************************
* 关键点1
*************************/
// Resolve instance field
KlassHandle sel_klass(THREAD, resolved_klass->find_field(field, sig, &fd));
// check if field exists; i.e., if a klass containing the field def has been selected
if (sel_klass.is_null()) {
ResourceMark rm(THREAD);
THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
}
if (!check_access)
// Access checking may be turned off when calling from within the VM.
return;
/************************
* 关键点2
*************************/
// check access
check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
// check for errors
if (is_static != fd.is_static()) {
// ...
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
}
// Final fields can only be accessed from its own class.
if (is_put && fd.access_flags().is_final() && sel_klass() != current_klass()) {
THROW(vmSymbols::java_lang_IllegalAccessError());
}
// initialize resolved_klass if necessary
// note 1: the klass which declared the field must be initialized (i.e, sel_klass)
// according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
//
// note 2: we don't want to force initialization if we are just checking
// if the field access is legal; e.g., during compilation
if (is_static && initialize_class) {
sel_klass->initialize(CHECK);
}
if (sel_klass() != current_klass()) {
HandleMark hm(THREAD);
Handle ref_loader (THREAD, InstanceKlass::cast(current_klass())->class_loader());
Handle sel_loader (THREAD, InstanceKlass::cast(sel_klass())->class_loader());
{
ResourceMark rm(THREAD);
/************************
* 关键点3
*************************/
Symbol* failed_type_symbol =
