void BranchTable::append(address inst_addr, address caller_addr,
address callee_addr, jint old_inst)
{
TTY_TRACE_IF_VERBOSE(("entering append\n"));
GUARANTEE(inst_addr >= (address) _compiler_area_start &&
inst_addr <= (address) _compiler_area_top, "inst_addr sansity\n");
GUARANTEE(caller_addr, "sanity check");
GUARANTEE(callee_addr, "sanity check");
GUARANTEE(old_inst, "sanity check");
/*remove old element*/
if (_b_items[_item_index].inst_addr() != 0)
{
*(int*)(_b_items[_item_index].inst_addr()) =
_b_items[_item_index].old_inst();
OsMisc_flush_icache(_b_items[_item_index].inst_addr(), 4);
TTY_TRACE_IF_VERBOSE(("cover an old branch item\n"));
}
/*new value*/
_b_items[_item_index].set_inst_addr(inst_addr);
_b_items[_item_index].set_caller_addr(caller_addr);
_b_items[_item_index].set_callee_addr(callee_addr);
_b_items[_item_index].set_old_inst(old_inst);
TTY_TRACE_IF_VERBOSE(("inst addr = 0x%x, caller addr = 0x%x\n",
*(int*) inst_addr, (int)caller_addr));
address target = callee_addr + CompiledMethodDesc::entry_offset();
int value;
value =( target - (inst_addr + 8)) >> 2;/*assumption: log(target)<24*/
*(int*)(inst_addr) = (0xE << 28 | 0xA << 24 | (value & ((1<<24) - 1)));
#if AZZERT
GUARANTEE(*(juint*)(inst_addr) >> 24 ==0xEA, "sanity");
#endif
OsMisc_flush_icache(inst_addr, 4);
++_item_index;
_item_index &= BRANCH_TABLE_LENGTH - 1;
TTY_TRACE_IF_VERBOSE(("leaving append\n"));
}
void BranchTable::remove_only(address cm)
{
for (int i = 0; i < BRANCH_TABLE_LENGTH; i++)
{
if (_b_items[i].inst_addr() != 0 &&
_b_items[i].callee_addr() == cm)
{
*(int*)(_b_items[i].inst_addr()) = _b_items[i].old_inst();
OsMisc_flush_icache(_b_items[i].inst_addr(), 4);
jvm_memset(&_b_items[i], 0, sizeof(BranchItem));
}
}
}
void BranchTable::remove()
{
TTY_TRACE_IF_VERBOSE(("entering remove\n"));
for (int i = 0; i < BRANCH_TABLE_LENGTH; i++)
{
if (_b_items[i].inst_addr() != 0)
{
const CompiledMethodDesc* callee = (CompiledMethodDesc*)_b_items[i].callee_addr();
const CompiledMethodDesc* caller = (CompiledMethodDesc*)_b_items[i].caller_addr();
const int callee_index = callee->get_cache_index();
const int caller_index = caller->get_cache_index();
GUARANTEE(callee_index >= 0, "sanity");
GUARANTEE(caller_index >= 0, "sanity");
if (callee_index > CompiledMethodCache::get_upb() ||
caller_index > CompiledMethodCache::get_upb() ||
CompiledMethodCache::get_item(callee_index) != callee ||
CompiledMethodCache::get_item(caller_index) != caller)//means removed
{
GUARANTEE(_b_items[i].inst_addr() >= (address) _compiler_area_start
&& _b_items[i].inst_addr() <= (address) _compiler_area_top, "sansity\n");
{
TTY_TRACE_IF_VERBOSE(("static removed\n"));
TTY_TRACE_IF_VERBOSE(("remove: inst_addr = 0x%x, index = %d\n",
(int) _b_items[i].inst_addr(), i));
GUARANTEE(*(juint*)(_b_items[i].inst_addr()) >> 24 ==0xEA,
"sanity");
*(int*)(_b_items[i].inst_addr()) = _b_items[i].old_inst();
OsMisc_flush_icache(_b_items[i].inst_addr(), 4);
}
jvm_memset(&_b_items[i], 0, sizeof(BranchItem));
TTY_TRACE_IF_VERBOSE(("removed index %d\n", i));
} else {
GUARANTEE(_b_items[i].inst_addr() >= (address) _compiler_area_start
&& _b_items[i].inst_addr() <= (address) _compiler_area_top, "sansity\n");
address old_caller_addr = _b_items[i].caller_addr();
address old_callee_addr = _b_items[i].callee_addr();
jint caller_shift = (int) ((MethodDesc*) old_caller_addr)->_klass;
if ( caller_shift!= 0)
{
_b_items[i].set_caller_addr(old_caller_addr + caller_shift);
TTY_TRACE_IF_VERBOSE(("adjusted caller\n"));
}
jint callee_shift = (int) ((MethodDesc*) old_callee_addr)->_klass;
if ( callee_shift != 0)
{
_b_items[i].set_callee_addr(old_callee_addr + callee_shift);
TTY_TRACE_IF_VERBOSE(("adjusted callee\n"));
}
{
int offset = callee_shift - caller_shift;
TTY_TRACE_IF_VERBOSE(("adjust: inst_addr = 0x%x, index = %d\n",
(int) _b_items[i].inst_addr(), i));
GUARANTEE(*(juint*)(_b_items[i].inst_addr()) >> 24 ==0xEA,
"sanity");
if (offset != 0)
{
TTY_TRACE_IF_VERBOSE(("adjusted index %d\n", i));
int* inst_addr = (int*) (_b_items[i].inst_addr());
int current_target = *inst_addr & ((1<<24) - 1);
current_target <<= 8; /*lsl*/
current_target >>= 6; /*asr*/
current_target += offset;
current_target >>=2;
current_target &= ((1<<24) - 1);
*inst_addr &= ~((1<<24) - 1);
*inst_addr |= current_target;
TTY_TRACE_IF_VERBOSE(("static adjusted\n"));
OsMisc_flush_icache((address) inst_addr, 4);
}
_b_items[i].set_inst_addr(_b_items[i].inst_addr() + caller_shift);
TTY_TRACE_IF_VERBOSE(("adjusted index %d\n", i));
}
}
void CompiledMethod::flush_icache() {
// Eventually, we can get rid of the relocation
OsMisc_flush_icache(entry(), size());
}
