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8207345: AArch64: Trampoline generation code reads from unitialized memory

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Reviewed-by: shade
This commit is contained in:
Andrew Haley 2018-07-17 15:28:17 +01:00
parent da18d08006
commit d326744b13
1 changed files with 13 additions and 5 deletions
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18
src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
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@ -739,11 +739,19 @@ address MacroAssembler::trampoline_call(Address entry, CodeBuffer *cbuf) {
|| entry.rspec().type() == relocInfo::static_call_type
|| entry.rspec().type() == relocInfo::virtual_call_type, "wrong reloc type");
unsigned int start_offset = offset();
if (far_branches() && !Compile::current()->in_scratch_emit_size()) {
address stub = emit_trampoline_stub(start_offset, entry.target());
if (stub == NULL) {
return NULL; // CodeCache is full
// We need a trampoline if branches are far.
if (far_branches()) {
// We don't want to emit a trampoline if C2 is generating dummy
// code during its branch shortening phase.
CompileTask* task = ciEnv::current()->task();
bool in_scratch_emit_size =
(task != NULL && is_c2_compile(task->comp_level()) &&
Compile::current()->in_scratch_emit_size());
if (!in_scratch_emit_size) {
address stub = emit_trampoline_stub(offset(), entry.target());
if (stub == NULL) {
return NULL; // CodeCache is full
}
}
}