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8006949: Update hotspot for MethodParameters format change

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8006907: Hotspot should reject classfiles with multiple MethodParameters attributes

Update to Hotspot's processing of MethodParameters attributes in classfiles

Reviewed-by: coleenp, jrose
This commit is contained in:
Eric McCorkle 2013-02-04 13:05:32 -05:00
parent 6c6a537471
commit 16990e896a
3 changed files with 32 additions and 24 deletions
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45
hotspot/src/share/vm/classfile/classFileParser.cpp
View file

@ -1947,6 +1947,8 @@ methodHandle ClassFileParser::parse_method(ClassLoaderData* loader_data,
u2** localvariable_type_table_start;
u2 method_parameters_length = 0;
u1* method_parameters_data = NULL;
bool method_parameters_seen = false;
bool method_parameters_four_byte_flags;
bool parsed_code_attribute = false;
bool parsed_checked_exceptions_attribute = false;
bool parsed_stackmap_attribute = false;
@ -2157,22 +2159,32 @@ methodHandle ClassFileParser::parse_method(ClassLoaderData* loader_data,
method_attribute_length,
cp, CHECK_(nullHandle));
} else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
// reject multiple method parameters
if (method_parameters_seen) {
classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
}
method_parameters_seen = true;
method_parameters_length = cfs->get_u1_fast();
// Track the actual size (note: this is written for clarity; a
// decent compiler will CSE and constant-fold this into a single
// expression)
u2 actual_size = 1;
method_parameters_data = cfs->get_u1_buffer();
actual_size += 2 * method_parameters_length;
cfs->skip_u2_fast(method_parameters_length);
actual_size += 4 * method_parameters_length;
cfs->skip_u4_fast(method_parameters_length);
// Enforce attribute length
if (method_attribute_length != actual_size) {
// Use the attribute length to figure out the size of flags
if (method_attribute_length == (method_parameters_length * 6u) + 1u) {
method_parameters_four_byte_flags = true;
} else if (method_attribute_length == (method_parameters_length * 4u) + 1u) {
method_parameters_four_byte_flags = false;
} else {
classfile_parse_error(
"Invalid MethodParameters method attribute length %u in class file %s",
"Invalid MethodParameters method attribute length %u in class file",
method_attribute_length, CHECK_(nullHandle));
}
method_parameters_data = cfs->get_u1_buffer();
cfs->skip_u2_fast(method_parameters_length);
if (method_parameters_four_byte_flags) {
cfs->skip_u4_fast(method_parameters_length);
} else {
cfs->skip_u2_fast(method_parameters_length);
}
// ignore this attribute if it cannot be reflected
if (!SystemDictionary::Parameter_klass_loaded())
method_parameters_length = 0;
@ -2316,15 +2328,16 @@ methodHandle ClassFileParser::parse_method(ClassLoaderData* loader_data,
// Copy method parameters
if (method_parameters_length > 0) {
MethodParametersElement* elem = m->constMethod()->method_parameters_start();
for(int i = 0; i < method_parameters_length; i++) {
elem[i].name_cp_index =
Bytes::get_Java_u2(method_parameters_data);
for (int i = 0; i < method_parameters_length; i++) {
elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
method_parameters_data += 2;
u4 flags = Bytes::get_Java_u4(method_parameters_data);
// This caused an alignment fault on Sparc, if flags was a u4
elem[i].flags_lo = extract_low_short_from_int(flags);
elem[i].flags_hi = extract_high_short_from_int(flags);
if (method_parameters_four_byte_flags) {
elem[i].flags = Bytes::get_Java_u4(method_parameters_data);
method_parameters_data += 4;
} else {
elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
method_parameters_data += 2;
}
}
}

7
hotspot/src/share/vm/oops/constMethod.hpp
View file

@ -122,12 +122,7 @@ class ExceptionTableElement VALUE_OBJ_CLASS_SPEC {
class MethodParametersElement VALUE_OBJ_CLASS_SPEC {
public:
u2 name_cp_index;
// This has to happen, otherwise it will cause SIGBUS from a
// misaligned u4 on some architectures (ie SPARC)
// because MethodParametersElements are only aligned mod 2
// within the ConstMethod container u2 flags_hi;
u2 flags_hi;
u2 flags_lo;
u2 flags;
};
class KlassSizeStats;

2
hotspot/src/share/vm/prims/jvm.cpp
View file

@ -1620,7 +1620,7 @@ JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
// For a 0 index, give a NULL symbol
Symbol* const sym = 0 != params[i].name_cp_index ?
mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
int flags = build_int_from_shorts(params[i].flags_lo, params[i].flags_hi);
int flags = params[i].flags;
oop param = Reflection::new_parameter(reflected_method, i, sym,
flags, CHECK_NULL);
result->obj_at_put(i, param);