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[perf-prof][arm64] Emit unwinding info to record the saved FP

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When emitting a frame, we always push the old frame pointer at offset 0 relative
to the new frame pointer. However, we didn't emit DWARF opcodes to inform perf
of this.

BUG=

Review-Url: https://codereview.chromium.org/2795253002
Cr-Commit-Position: refs/heads/master@{#44384}
This commit is contained in:
pierre.langlois 2017-04-04 08:37:05 -07:00 committed by Commit bot
parent eddf90c4a7
commit 2db1f598c5
1 changed files with 2 additions and 0 deletions
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2
src/compiler/arm64/unwinding-info-writer-arm64.cc
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@ -24,6 +24,7 @@ void UnwindingInfoWriter::BeginInstructionBlock(int pc_offset,
eh_frame_writer_.AdvanceLocation(pc_offset);
if (initial_state->saved_lr_) {
eh_frame_writer_.RecordRegisterSavedToStack(lr, kPointerSize);
eh_frame_writer_.RecordRegisterSavedToStack(fp, 0);
} else {
eh_frame_writer_.RecordRegisterFollowsInitialRule(lr);
}
@ -76,6 +77,7 @@ void UnwindingInfoWriter::MarkFrameConstructed(int at_pc) {
// the construction, since the LR itself is not modified in the process.
eh_frame_writer_.AdvanceLocation(at_pc);
eh_frame_writer_.RecordRegisterSavedToStack(lr, kPointerSize);
eh_frame_writer_.RecordRegisterSavedToStack(fp, 0);
saved_lr_ = true;
}