9f732af583
As a follow up to {D123271}, LBR ranges that are too big should also be considered as invalid.
For example, the last two pairs in the following trace form a range [0x0d7b02b0, 0x368ba706] that covers a ton of functions in the binary. Such oversized range should also be ignored.
0x0c74505f/0x368b99a0 **0x368ba706**/0x0c745040 0x0d7b1c3f/**0x0d7b02b0**
Add a defensive check to filter out those ranges based that the valid range should not cross the unconditional branch(Call, return, unconditional jmp).
Reviewed By: hoy, wenlei
Differential Revision: https://reviews.llvm.org/D125448
20 lines
1.2 KiB
Plaintext
20 lines
1.2 KiB
Plaintext
PERF_RECORD_MMAP2 1243676/1243676: [0x201000(0x1000) @ 0 00:1d 224517108 1044165]: r-xp /home/noinline-cs-pseudoprobe.perfbin
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20179e
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2017f9
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7f83e84e7793
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5541f689495641d7
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0x2017cf/0x20179e/P/-/-/0 0x20177f/0x2017c4/P/-/-/0 0x2017bf/0x201760/P/-/-/0 0x2017d8/0x2017e3/P/-/-/0 0x20177f/0x2017c4/P/-/-/0 0x2017bf/0x201760/P/-/-/0 0x2017cf/0x20179e/P/-/-/0
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// The consecutive pairs 0x2017bf/0x201760 and 0x2017d8/0x2017e3 form an invalid execution range [0x2017e3, 0x2017bf], should be ignored to avoid bogus instruction ranges.
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20179e
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2017f9
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7f83e84e7793
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5541f689495641d7
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0x2017cf/0x20179e/P/-/-/0 0x2017cf/0x20179e/P/-/-/0 0x20177f/0x2017c4/P/-/-/0 0x2017bf/0x201760/P/-/-/0 0x2017cf/0x20179e/P/-/-/0 0x20177f/0x2017c4/P/-/-/0 0x2017bf/0x201760/P/-/-/0 0x2017cf/0x20179e/P/-/-/0 0x20177f/0x2017c4/P/-/-/0 0x2017bf/0x201760/P/-/-/0 0x2017cf/0x20179e/P/-/-/0 0x20177f/0x2017c4/P/-/-/0 0x2017bf/0x201760/P/-/-/0 0x2017cf/0x20179e/P/-/-/0 0x20177f/0x2017c4/P/-/-/0 0x2017bf/0x201760/P/-/-/0
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// Duplicated LBR entries "0x2017cf/0x20179e/P/-/-/0 0x2017cf/0x20179e/P/-/-/0", the range [0x20179e, 0x2017cf] is cross unconditional jmp, should be ignored to avoid bogus instruction ranges.
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