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Bug
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Resolution: Fixed
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P5
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9
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b20
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x86
From Tom Rodriguez:
If you run with -XX:+PrintRelocations you’ll see output kind of like this:
relocInfo@0x0000000107d7b50e [type=10(poll) addr=0x0000000107d7b6ab offset=113]
@0x0000000107d7b510: a400
relocInfo@0x0000000107d7b510 [type=10(poll) addr=0x0000000107d7b6ab offset=0 format=1]
@0x0000000107d7b512: b423
The reason is that the shared add_debug_info_for branch calls relocate but so does the testl code for the poll itself. It’s not a big deal, though I think it may be what causes this fixup of the operand type in fix_relocation_after_move in relocInfo_x86.cpp:
#ifdef _LP64
if (!Assembler::is_polling_page_far()) {
typedef Assembler::WhichOperand WhichOperand;
WhichOperand which = (WhichOperand) format();
// This format is imm but it is really disp32
which = Assembler::disp32_operand;
The shared reloc has the wrong format so it has to be fixed up.
The extra relocate call is benign I think exception that it’s used in emit_opBranch:
if (op->cond() == lir_cond_always) {
if (op->info() != NULL) add_debug_info_for_branch(op->info());
__ jmp (*(op->label()));
I don’t know what’s going on here but I assume this should really be a safe point poll. Simply adding debug info doesn’t really do anything.
If you run with -XX:+PrintRelocations you’ll see output kind of like this:
relocInfo@0x0000000107d7b50e [type=10(poll) addr=0x0000000107d7b6ab offset=113]
@0x0000000107d7b510: a400
relocInfo@0x0000000107d7b510 [type=10(poll) addr=0x0000000107d7b6ab offset=0 format=1]
@0x0000000107d7b512: b423
The reason is that the shared add_debug_info_for branch calls relocate but so does the testl code for the poll itself. It’s not a big deal, though I think it may be what causes this fixup of the operand type in fix_relocation_after_move in relocInfo_x86.cpp:
#ifdef _LP64
if (!Assembler::is_polling_page_far()) {
typedef Assembler::WhichOperand WhichOperand;
WhichOperand which = (WhichOperand) format();
// This format is imm but it is really disp32
which = Assembler::disp32_operand;
The shared reloc has the wrong format so it has to be fixed up.
The extra relocate call is benign I think exception that it’s used in emit_opBranch:
if (op->cond() == lir_cond_always) {
if (op->info() != NULL) add_debug_info_for_branch(op->info());
__ jmp (*(op->label()));
I don’t know what’s going on here but I assume this should really be a safe point poll. Simply adding debug info doesn’t really do anything.
- relates to
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JDK-8046684 sharedRuntime.cpp...assert(((nmethod*)cb)->is_at_poll_or_poll_return(pc)) failed: safepoint polling: type must be poll
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- Closed
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