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/*
* Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "code/codeCache.hpp"
#include "code/compiledIC.hpp"
#include "code/nmethod.hpp"
#include "code/relocInfo.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.hpp"
#include "oops/compressedOops.inline.hpp"
#include "oops/oop.inline.hpp"
#include "runtime/flags/flagSetting.hpp"
#include "runtime/stubCodeGenerator.hpp"
#include "utilities/align.hpp"
#include "utilities/copy.hpp"
const RelocationHolder RelocationHolder::none; // its type is relocInfo::none
// Implementation of relocInfo
#ifdef ASSERT
relocInfo::relocType relocInfo::check_relocType(relocType type) {
assert(type != data_prefix_tag, "cannot build a prefix this way");
assert((type & type_mask) == type, "wrong type");
return type;
}
void relocInfo::check_offset_and_format(int offset, int format) {
assert(offset >= 0 && offset < offset_limit(), "offset out off bounds");
assert(is_aligned(offset, offset_unit), "misaligned offset");
assert((format & format_mask) == format, "wrong format");
}
#endif // ASSERT
void relocInfo::initialize(CodeSection* dest, Relocation* reloc) {
relocInfo* data = this+1; // here's where the data might go
dest->set_locs_end(data); // sync end: the next call may read dest.locs_end
reloc->pack_data_to(dest); // maybe write data into locs, advancing locs_end
relocInfo* data_limit = dest->locs_end();
if (data_limit > data) {
relocInfo suffix = (*this);
data_limit = this->finish_prefix((short*) data_limit);
// Finish up with the suffix. (Hack note: pack_data_to might edit this.)
*data_limit = suffix;
dest->set_locs_end(data_limit+1);
}
}
relocInfo* relocInfo::finish_prefix(short* prefix_limit) {
assert(sizeof(relocInfo) == sizeof(short), "change this code");
short* p = (short*)(this+1);
assert(prefix_limit >= p, "must be a valid span of data");
int plen = prefix_limit - p;
if (plen == 0) {
debug_only(_value = 0xFFFF);
return this; // no data: remove self completely
}
if (plen == 1 && fits_into_immediate(p[0])) {
(*this) = immediate_relocInfo(p[0]); // move data inside self
return this+1;
}
// cannot compact, so just update the count and return the limit pointer
(*this) = prefix_relocInfo(plen); // write new datalen
assert(data() + datalen() == prefix_limit, "pointers must line up");
return (relocInfo*)prefix_limit;
}
void relocInfo::set_type(relocType t) {
int old_offset = addr_offset();
int old_format = format();
(*this) = relocInfo(t, old_offset, old_format);
assert(type()==(int)t, "sanity check");
assert(addr_offset()==old_offset, "sanity check");
assert(format()==old_format, "sanity check");
}
void relocInfo::change_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type, relocType new_type) {
bool found = false;
while (itr->next() && !found) {
if (itr->addr() == pc) {
assert(itr->type()==old_type, "wrong relocInfo type found");
itr->current()->set_type(new_type);
found=true;
}
}
assert(found, "no relocInfo found for pc");
}
// ----------------------------------------------------------------------------------------------------
// Implementation of RelocIterator
void RelocIterator::initialize(CompiledMethod* nm, address begin, address limit) {
initialize_misc();
if (nm == NULL && begin != NULL) {
// allow nmethod to be deduced from beginning address
CodeBlob* cb = CodeCache::find_blob(begin);
nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
}
guarantee(nm != NULL, "must be able to deduce nmethod from other arguments");
_code = nm;
_current = nm->relocation_begin() - 1;
_end = nm->relocation_end();
_addr = nm->content_begin();
// Initialize code sections.
_section_start[CodeBuffer::SECT_CONSTS] = nm->consts_begin();
_section_start[CodeBuffer::SECT_INSTS ] = nm->insts_begin() ;
_section_start[CodeBuffer::SECT_STUBS ] = nm->stub_begin() ;
_section_end [CodeBuffer::SECT_CONSTS] = nm->consts_end() ;
_section_end [CodeBuffer::SECT_INSTS ] = nm->insts_end() ;
_section_end [CodeBuffer::SECT_STUBS ] = nm->stub_end() ;
assert(!has_current(), "just checking");
assert(begin == NULL || begin >= nm->code_begin(), "in bounds");
assert(limit == NULL || limit <= nm->code_end(), "in bounds");
set_limits(begin, limit);
}
RelocIterator::RelocIterator(CodeSection* cs, address begin, address limit) {
initialize_misc();
_current = cs->locs_start()-1;
_end = cs->locs_end();
_addr = cs->start();
_code = NULL; // Not cb->blob();
CodeBuffer* cb = cs->outer();
assert((int) SECT_LIMIT == CodeBuffer::SECT_LIMIT, "my copy must be equal");
for (int n = (int) CodeBuffer::SECT_FIRST; n < (int) CodeBuffer::SECT_LIMIT; n++) {
CodeSection* cs = cb->code_section(n);
_section_start[n] = cs->start();
_section_end [n] = cs->end();
}
assert(!has_current(), "just checking");
assert(begin == NULL || begin >= cs->start(), "in bounds");
assert(limit == NULL || limit <= cs->end(), "in bounds");
set_limits(begin, limit);
}
bool RelocIterator::addr_in_const() const {
const int n = CodeBuffer::SECT_CONSTS;
return section_start(n) <= addr() && addr() < section_end(n);
}
void RelocIterator::set_limits(address begin, address limit) {
_limit = limit;
// the limit affects this next stuff:
if (begin != NULL) {
relocInfo* backup;
address backup_addr;
while (true) {
backup = _current;
backup_addr = _addr;
if (!next() || addr() >= begin) break;
}
// At this point, either we are at the first matching record,
// or else there is no such record, and !has_current().
// In either case, revert to the immediately preceding state.
_current = backup;
_addr = backup_addr;
set_has_current(false);
}
}
// All the strange bit-encodings are in here.
// The idea is to encode relocation data which are small integers
// very efficiently (a single extra halfword). Larger chunks of
// relocation data need a halfword header to hold their size.
void RelocIterator::advance_over_prefix() {
if (_current->is_datalen()) {
_data = (short*) _current->data();
_datalen = _current->datalen();
_current += _datalen + 1; // skip the embedded data & header
} else {
_databuf = _current->immediate();
_data = &_databuf;
_datalen = 1;
_current++; // skip the header
}
// The client will see the following relocInfo, whatever that is.
// It is the reloc to which the preceding data applies.
}
void RelocIterator::initialize_misc() {
set_has_current(false);
for (int i = (int) CodeBuffer::SECT_FIRST; i < (int) CodeBuffer::SECT_LIMIT; i++) {
_section_start[i] = NULL; // these will be lazily computed, if needed
_section_end [i] = NULL;
}
}
Relocation* RelocIterator::reloc() {
// (take the "switch" out-of-line)
relocInfo::relocType t = type();
if (false) {}
#define EACH_TYPE(name) \
else if (t == relocInfo::name##_type) { \
return name##_reloc(); \
}
APPLY_TO_RELOCATIONS(EACH_TYPE);
#undef EACH_TYPE
assert(t == relocInfo::none, "must be padding");
return new(_rh) Relocation(t);
}
//////// Methods for flyweight Relocation types
RelocationHolder RelocationHolder::plus(int offset) const {
if (offset != 0) {
switch (type()) {
case relocInfo::none:
break;
case relocInfo::oop_type:
{
oop_Relocation* r = (oop_Relocation*)reloc();
return oop_Relocation::spec(r->oop_index(), r->offset() + offset);
}
case relocInfo::metadata_type:
{
metadata_Relocation* r = (metadata_Relocation*)reloc();
return metadata_Relocation::spec(r->metadata_index(), r->offset() + offset);
}
default:
ShouldNotReachHere();
}
}
return (*this);
}
// some relocations can compute their own values
address Relocation::value() {
ShouldNotReachHere();
return NULL;
}
void Relocation::set_value(address x) {
ShouldNotReachHere();
}
void Relocation::const_set_data_value(address x) {
#ifdef _LP64
if (format() == relocInfo::narrow_oop_in_const) {
*(narrowOop*)addr() = CompressedOops::encode(cast_to_oop(x));
} else {
#endif
*(address*)addr() = x;
#ifdef _LP64
}
#endif
}
void Relocation::const_verify_data_value(address x) {
#ifdef _LP64
if (format() == relocInfo::narrow_oop_in_const) {
guarantee(*(narrowOop*)addr() == CompressedOops::encode(cast_to_oop(x)), "must agree");
} else {
#endif
guarantee(*(address*)addr() == x, "must agree");
#ifdef _LP64
}
#endif
}
RelocationHolder Relocation::spec_simple(relocInfo::relocType rtype) {
if (rtype == relocInfo::none) return RelocationHolder::none;
relocInfo ri = relocInfo(rtype, 0);
RelocIterator itr;
itr.set_current(ri);
itr.reloc();
return itr._rh;
}
address Relocation::old_addr_for(address newa,
const CodeBuffer* src, CodeBuffer* dest) {
int sect = dest->section_index_of(newa);
guarantee(sect != CodeBuffer::SECT_NONE, "lost track of this address");
address ostart = src->code_section(sect)->start();
address nstart = dest->code_section(sect)->start();
return ostart + (newa - nstart);
}
address Relocation::new_addr_for(address olda,
const CodeBuffer* src, CodeBuffer* dest) {
debug_only(const CodeBuffer* src0 = src);
int sect = CodeBuffer::SECT_NONE;
// Look for olda in the source buffer, and all previous incarnations
// if the source buffer has been expanded.
for (; src != NULL; src = src->before_expand()) {
sect = src->section_index_of(olda);
if (sect != CodeBuffer::SECT_NONE) break;
}
guarantee(sect != CodeBuffer::SECT_NONE, "lost track of this address");
address ostart = src->code_section(sect)->start();
address nstart = dest->code_section(sect)->start();
return nstart + (olda - ostart);
}
void Relocation::normalize_address(address& addr, const CodeSection* dest, bool allow_other_sections) {
address addr0 = addr;
if (addr0 == NULL || dest->allocates2(addr0)) return;
CodeBuffer* cb = dest->outer();
addr = new_addr_for(addr0, cb, cb);
assert(allow_other_sections || dest->contains2(addr),
"addr must be in required section");
}
void CallRelocation::set_destination(address x) {
pd_set_call_destination(x);
}
void CallRelocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
// Usually a self-relative reference to an external routine.
// On some platforms, the reference is absolute (not self-relative).
// The enhanced use of pd_call_destination sorts this all out.
address orig_addr = old_addr_for(addr(), src, dest);
address callee = pd_call_destination(orig_addr);
// Reassert the callee address, this time in the new copy of the code.
pd_set_call_destination(callee);
}
//// pack/unpack methods
void oop_Relocation::pack_data_to(CodeSection* dest) {
short* p = (short*) dest->locs_end();
p = pack_2_ints_to(p, _oop_index, _offset);
dest->set_locs_end((relocInfo*) p);
}
void oop_Relocation::unpack_data() {
unpack_2_ints(_oop_index, _offset);
}
void metadata_Relocation::pack_data_to(CodeSection* dest) {
short* p = (short*) dest->locs_end();
p = pack_2_ints_to(p, _metadata_index, _offset);
dest->set_locs_end((relocInfo*) p);
}
void metadata_Relocation::unpack_data() {
unpack_2_ints(_metadata_index, _offset);
}
void virtual_call_Relocation::pack_data_to(CodeSection* dest) {
short* p = (short*) dest->locs_end();
address point = dest->locs_point();
normalize_address(_cached_value, dest);
jint x0 = scaled_offset_null_special(_cached_value, point);
p = pack_2_ints_to(p, x0, _method_index);
dest->set_locs_end((relocInfo*) p);
}
void virtual_call_Relocation::unpack_data() {
jint x0 = 0;
unpack_2_ints(x0, _method_index);
address point = addr();
_cached_value = x0==0? NULL: address_from_scaled_offset(x0, point);
}
void runtime_call_w_cp_Relocation::pack_data_to(CodeSection * dest) {
short* p = pack_1_int_to((short *)dest->locs_end(), (jint)(_offset >> 2));
dest->set_locs_end((relocInfo*) p);
}
void runtime_call_w_cp_Relocation::unpack_data() {
_offset = unpack_1_int() << 2;
}
void static_stub_Relocation::pack_data_to(CodeSection* dest) {
short* p = (short*) dest->locs_end();
CodeSection* insts = dest->outer()->insts();
normalize_address(_static_call, insts);
p = pack_1_int_to(p, scaled_offset(_static_call, insts->start()));
dest->set_locs_end((relocInfo*) p);
}
void static_stub_Relocation::unpack_data() {
address base = binding()->section_start(CodeBuffer::SECT_INSTS);
jint offset = unpack_1_int();
_static_call = address_from_scaled_offset(offset, base);
}
void trampoline_stub_Relocation::pack_data_to(CodeSection* dest ) {
short* p = (short*) dest->locs_end();
CodeSection* insts = dest->outer()->insts();
normalize_address(_owner, insts);
p = pack_1_int_to(p, scaled_offset(_owner, insts->start()));
dest->set_locs_end((relocInfo*) p);
}
void trampoline_stub_Relocation::unpack_data() {
address base = binding()->section_start(CodeBuffer::SECT_INSTS);
_owner = address_from_scaled_offset(unpack_1_int(), base);
}
void external_word_Relocation::pack_data_to(CodeSection* dest) {
short* p = (short*) dest->locs_end();
#ifndef _LP64
p = pack_1_int_to(p, (int32_t) (intptr_t)_target);
#else
jlong t = (jlong) _target;
int32_t lo = low(t);
int32_t hi = high(t);
p = pack_2_ints_to(p, lo, hi);
#endif /* _LP64 */
dest->set_locs_end((relocInfo*) p);
}
void external_word_Relocation::unpack_data() {
#ifndef _LP64
_target = (address) (intptr_t)unpack_1_int();
#else
jint lo, hi;
unpack_2_ints(lo, hi);
jlong t = jlong_from(hi, lo);;
_target = (address) t;
#endif /* _LP64 */
}
void internal_word_Relocation::pack_data_to(CodeSection* dest) {
short* p = (short*) dest->locs_end();
normalize_address(_target, dest, true);
// Check whether my target address is valid within this section.
// If not, strengthen the relocation type to point to another section.
int sindex = _section;
if (sindex == CodeBuffer::SECT_NONE && _target != NULL
&& (!dest->allocates(_target) || _target == dest->locs_point())) {
sindex = dest->outer()->section_index_of(_target);
guarantee(sindex != CodeBuffer::SECT_NONE, "must belong somewhere");
relocInfo* base = dest->locs_end() - 1;
assert(base->type() == this->type(), "sanity");
// Change the written type, to be section_word_type instead.
base->set_type(relocInfo::section_word_type);
}
// Note: An internal_word relocation cannot refer to its own instruction,
// because we reserve "0" to mean that the pointer itself is embedded
// in the code stream. We use a section_word relocation for such cases.
if (sindex == CodeBuffer::SECT_NONE) {
assert(type() == relocInfo::internal_word_type, "must be base class");
guarantee(_target == NULL || dest->allocates2(_target), "must be within the given code section");
jint x0 = scaled_offset_null_special(_target, dest->locs_point());
assert(!(x0 == 0 && _target != NULL), "correct encoding of null target");
p = pack_1_int_to(p, x0);
} else {
assert(_target != NULL, "sanity");
CodeSection* sect = dest->outer()->code_section(sindex);
guarantee(sect->allocates2(_target), "must be in correct section");
address base = sect->start();
jint offset = scaled_offset(_target, base);
assert((uint)sindex < (uint)CodeBuffer::SECT_LIMIT, "sanity");
assert(CodeBuffer::SECT_LIMIT <= (1 << section_width), "section_width++");
p = pack_1_int_to(p, (offset << section_width) | sindex);
}
dest->set_locs_end((relocInfo*) p);
}
void internal_word_Relocation::unpack_data() {
jint x0 = unpack_1_int();
_target = x0==0? NULL: address_from_scaled_offset(x0, addr());
_section = CodeBuffer::SECT_NONE;
}
void section_word_Relocation::unpack_data() {
jint x = unpack_1_int();
jint offset = (x >> section_width);
int sindex = (x & ((1<<section_width)-1));
address base = binding()->section_start(sindex);
_section = sindex;
_target = address_from_scaled_offset(offset, base);
}
//// miscellaneous methods
oop* oop_Relocation::oop_addr() {
int n = _oop_index;
if (n == 0) {
// oop is stored in the code stream
return (oop*) pd_address_in_code();
} else {
// oop is stored in table at nmethod::oops_begin
return code()->oop_addr_at(n);
}
}
oop oop_Relocation::oop_value() {
// clean inline caches store a special pseudo-null
if (Universe::contains_non_oop_word(oop_addr())) {
return NULL;
}
return *oop_addr();
}
void oop_Relocation::fix_oop_relocation() {
if (!oop_is_immediate()) {
// get the oop from the pool, and re-insert it into the instruction:
set_value(value());
}
}
void oop_Relocation::verify_oop_relocation() {
if (!oop_is_immediate()) {
// get the oop from the pool, and re-insert it into the instruction:
verify_value(value());
}
}
// meta data versions
Metadata** metadata_Relocation::metadata_addr() {
int n = _metadata_index;
if (n == 0) {
// metadata is stored in the code stream
return (Metadata**) pd_address_in_code();
} else {
// metadata is stored in table at nmethod::metadatas_begin
return code()->metadata_addr_at(n);
}
}
Metadata* metadata_Relocation::metadata_value() {
Metadata* v = *metadata_addr();
// clean inline caches store a special pseudo-null
if (v == (Metadata*)Universe::non_oop_word()) v = NULL;
return v;
}
void metadata_Relocation::fix_metadata_relocation() {
if (!metadata_is_immediate()) {
// get the metadata from the pool, and re-insert it into the instruction:
pd_fix_value(value());
}
}
address virtual_call_Relocation::cached_value() {
assert(_cached_value != NULL && _cached_value < addr(), "must precede ic_call");
return _cached_value;
}
Method* virtual_call_Relocation::method_value() {
CompiledMethod* cm = code();
if (cm == NULL) return (Method*)NULL;
Metadata* m = cm->metadata_at(_method_index);
assert(m != NULL || _method_index == 0, "should be non-null for non-zero index");
assert(m == NULL || m->is_method(), "not a method");
return (Method*)m;
}
bool virtual_call_Relocation::clear_inline_cache() {
// No stubs for ICs
// Clean IC
ResourceMark rm;
CompiledIC* icache = CompiledIC_at(this);
return icache->set_to_clean();
}
void opt_virtual_call_Relocation::pack_data_to(CodeSection* dest) {
short* p = (short*) dest->locs_end();
p = pack_1_int_to(p, _method_index);
dest->set_locs_end((relocInfo*) p);
}
void opt_virtual_call_Relocation::unpack_data() {
_method_index = unpack_1_int();
}
Method* opt_virtual_call_Relocation::method_value() {
CompiledMethod* cm = code();
if (cm == NULL) return (Method*)NULL;
Metadata* m = cm->metadata_at(_method_index);
assert(m != NULL || _method_index == 0, "should be non-null for non-zero index");
assert(m == NULL || m->is_method(), "not a method");
return (Method*)m;
}
template<typename CompiledICorStaticCall>
static bool set_to_clean_no_ic_refill(CompiledICorStaticCall* ic) {
guarantee(ic->set_to_clean(), "Should not need transition stubs");
return true;
}
bool opt_virtual_call_Relocation::clear_inline_cache() {
// No stubs for ICs
// Clean IC
ResourceMark rm;
CompiledIC* icache = CompiledIC_at(this);
return set_to_clean_no_ic_refill(icache);
}
address opt_virtual_call_Relocation::static_stub() {
// search for the static stub who points back to this static call
address static_call_addr = addr();
RelocIterator iter(code());
while (iter.next()) {
if (iter.type() == relocInfo::static_stub_type) {
static_stub_Relocation* stub_reloc = iter.static_stub_reloc();
if (stub_reloc->static_call() == static_call_addr) {
return iter.addr();
}
}
}
return NULL;
}
Method* static_call_Relocation::method_value() {
CompiledMethod* cm = code();
if (cm == NULL) return (Method*)NULL;
Metadata* m = cm->metadata_at(_method_index);
assert(m != NULL || _method_index == 0, "should be non-null for non-zero index");
assert(m == NULL || m->is_method(), "not a method");
return (Method*)m;
}
void static_call_Relocation::pack_data_to(CodeSection* dest) {
short* p = (short*) dest->locs_end();
p = pack_1_int_to(p, _method_index);
dest->set_locs_end((relocInfo*) p);
}
void static_call_Relocation::unpack_data() {
_method_index = unpack_1_int();
}
bool static_call_Relocation::clear_inline_cache() {
// Safe call site info
CompiledStaticCall* handler = this->code()->compiledStaticCall_at(this);
return set_to_clean_no_ic_refill(handler);
}
address static_call_Relocation::static_stub() {
// search for the static stub who points back to this static call
address static_call_addr = addr();
RelocIterator iter(code());
while (iter.next()) {
if (iter.type() == relocInfo::static_stub_type) {
static_stub_Relocation* stub_reloc = iter.static_stub_reloc();
if (stub_reloc->static_call() == static_call_addr) {
return iter.addr();
}
}
}
return NULL;
}
// Finds the trampoline address for a call. If no trampoline stub is
// found NULL is returned which can be handled by the caller.
address trampoline_stub_Relocation::get_trampoline_for(address call, nmethod* code) {
// There are no relocations available when the code gets relocated
// because of CodeBuffer expansion.
if (code->relocation_size() == 0)
return NULL;
RelocIterator iter(code, call);
while (iter.next()) {
if (iter.type() == relocInfo::trampoline_stub_type) {
if (iter.trampoline_stub_reloc()->owner() == call) {
return iter.addr();
}
}
}
return NULL;
}
bool static_stub_Relocation::clear_inline_cache() {
// Call stub is only used when calling the interpreted code.
// It does not really need to be cleared, except that we want to clean out the methodoop.
CompiledDirectStaticCall::set_stub_to_clean(this);
return true;
}
void external_word_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
if (_target != NULL) {
// Probably this reference is absolute, not relative, so the following is
// probably a no-op.
set_value(_target);
}
// If target is NULL, this is an absolute embedded reference to an external
// location, which means there is nothing to fix here. In either case, the
// resulting target should be an "external" address.
postcond(src->section_index_of(target()) == CodeBuffer::SECT_NONE);
postcond(dest->section_index_of(target()) == CodeBuffer::SECT_NONE);
}
address external_word_Relocation::target() {
address target = _target;
if (target == NULL) {
target = pd_get_address_from_code();
}
return target;
}
void internal_word_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
address target = _target;
if (target == NULL) {
target = new_addr_for(this->target(), src, dest);
}
set_value(target);
}
address internal_word_Relocation::target() {
address target = _target;
if (target == NULL) {
if (addr_in_const()) {
target = *(address*)addr();
} else {
target = pd_get_address_from_code();
}
}
return target;
}
//---------------------------------------------------------------------------------
// Non-product code
#ifndef PRODUCT
static const char* reloc_type_string(relocInfo::relocType t) {
switch (t) {
#define EACH_CASE(name) \
case relocInfo::name##_type: \
return #name;
APPLY_TO_RELOCATIONS(EACH_CASE);
#undef EACH_CASE
case relocInfo::none:
return "none";
case relocInfo::data_prefix_tag:
return "prefix";
default:
return "UNKNOWN RELOC TYPE";
}
}
void RelocIterator::print_current() {
if (!has_current()) {
tty->print_cr("(no relocs)");
return;
}
tty->print("relocInfo@" INTPTR_FORMAT " [type=%d(%s) addr=" INTPTR_FORMAT " offset=%d",
p2i(_current), type(), reloc_type_string((relocInfo::relocType) type()), p2i(_addr), _current->addr_offset());
if (current()->format() != 0)
tty->print(" format=%d", current()->format());
if (datalen() == 1) {
tty->print(" data=%d", data()[0]);
} else if (datalen() > 0) {
tty->print(" data={");
for (int i = 0; i < datalen(); i++) {
tty->print("%04x", data()[i] & 0xFFFF);
}
tty->print("}");
}
tty->print("]");
switch (type()) {
case relocInfo::oop_type:
{
oop_Relocation* r = oop_reloc();
oop* oop_addr = NULL;
oop raw_oop = NULL;
oop oop_value = NULL;
if (code() != NULL || r->oop_is_immediate()) {
oop_addr = r->oop_addr();
raw_oop = *oop_addr;
oop_value = r->oop_value();
}
tty->print(" | [oop_addr=" INTPTR_FORMAT " *=" INTPTR_FORMAT " offset=%d]",
p2i(oop_addr), p2i(raw_oop), r->offset());
// Do not print the oop by default--we want this routine to
// work even during GC or other inconvenient times.
if (WizardMode && oop_value != NULL) {
tty->print("oop_value=" INTPTR_FORMAT ": ", p2i(oop_value));
if (oopDesc::is_oop(oop_value)) {
oop_value->print_value_on(tty);
}
}
break;
}
case relocInfo::metadata_type:
{
metadata_Relocation* r = metadata_reloc();
Metadata** metadata_addr = NULL;
Metadata* raw_metadata = NULL;
Metadata* metadata_value = NULL;
if (code() != NULL || r->metadata_is_immediate()) {
metadata_addr = r->metadata_addr();
raw_metadata = *metadata_addr;
metadata_value = r->metadata_value();
}
tty->print(" | [metadata_addr=" INTPTR_FORMAT " *=" INTPTR_FORMAT " offset=%d]",
p2i(metadata_addr), p2i(raw_metadata), r->offset());
if (metadata_value != NULL) {
tty->print("metadata_value=" INTPTR_FORMAT ": ", p2i(metadata_value));
metadata_value->print_value_on(tty);
}
break;
}
case relocInfo::external_word_type:
case relocInfo::internal_word_type:
case relocInfo::section_word_type:
{
DataRelocation* r = (DataRelocation*) reloc();
tty->print(" | [target=" INTPTR_FORMAT "]", p2i(r->value())); //value==target
break;
}
case relocInfo::static_call_type:
{
static_call_Relocation* r = (static_call_Relocation*) reloc();
tty->print(" | [destination=" INTPTR_FORMAT " metadata=" INTPTR_FORMAT "]",
p2i(r->destination()), p2i(r->method_value()));
break;
}
case relocInfo::runtime_call_type:
case relocInfo::runtime_call_w_cp_type:
{
CallRelocation* r = (CallRelocation*) reloc();
tty->print(" | [destination=" INTPTR_FORMAT "]", p2i(r->destination()));
break;
}
case relocInfo::virtual_call_type:
{
virtual_call_Relocation* r = (virtual_call_Relocation*) reloc();
tty->print(" | [destination=" INTPTR_FORMAT " cached_value=" INTPTR_FORMAT " metadata=" INTPTR_FORMAT "]",
p2i(r->destination()), p2i(r->cached_value()), p2i(r->method_value()));
break;
}
case relocInfo::static_stub_type:
{
static_stub_Relocation* r = (static_stub_Relocation*) reloc();
tty->print(" | [static_call=" INTPTR_FORMAT "]", p2i(r->static_call()));
break;
}
case relocInfo::trampoline_stub_type:
{
trampoline_stub_Relocation* r = (trampoline_stub_Relocation*) reloc();
tty->print(" | [trampoline owner=" INTPTR_FORMAT "]", p2i(r->owner()));
break;
}
case relocInfo::opt_virtual_call_type:
{
opt_virtual_call_Relocation* r = (opt_virtual_call_Relocation*) reloc();
tty->print(" | [destination=" INTPTR_FORMAT " metadata=" INTPTR_FORMAT "]",
p2i(r->destination()), p2i(r->method_value()));
break;
}
default:
break;
}
tty->cr();
}
void RelocIterator::print() {
RelocIterator save_this = (*this);
relocInfo* scan = _current;
if (!has_current()) scan += 1; // nothing to scan here!
bool skip_next = has_current();
bool got_next;
while (true) {
got_next = (skip_next || next());
skip_next = false;
tty->print(" @" INTPTR_FORMAT ": ", p2i(scan));
relocInfo* newscan = _current+1;
if (!has_current()) newscan -= 1; // nothing to scan here!
while (scan < newscan) {
tty->print("%04x", *(short*)scan & 0xFFFF);
scan++;
}
tty->cr();
if (!got_next) break;
print_current();
}
(*this) = save_this;
}
// For the debugger:
extern "C"
void print_blob_locs(nmethod* nm) {
nm->print();
RelocIterator iter(nm);
iter.print();
}
extern "C"
void print_buf_locs(CodeBuffer* cb) {
FlagSetting fs(PrintRelocations, true);
cb->print();
}
#endif // !PRODUCT
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