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# fb1abe00 16-Sep-2020 Ryan Prichard <[email protected]>

[libunwind][DWARF] Fix end of .eh_frame calculation

* When .eh_frame is located using .eh_frame_hdr (PT_GNU_EH_FRAME), the
start of .eh_frame is known, but not the size. In this case, the
unw

[libunwind][DWARF] Fix end of .eh_frame calculation

* When .eh_frame is located using .eh_frame_hdr (PT_GNU_EH_FRAME), the
start of .eh_frame is known, but not the size. In this case, the
unwinder must rely on a terminator present at the end of .eh_frame.
Set dwarf_section_length to UINTPTR_MAX to indicate this.

* Add a new field, text_segment_length, that the FrameHeaderCache uses
to track the size of the PT_LOAD segment indicated by dso_base.

* Compute ehSectionEnd by adding sectionLength to ehSectionStart,
never to fdeHint.

Fixes PR46829.

Differential Revision: https://reviews.llvm.org/D87750

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Revision tags: llvmorg-11.0.0-rc2, llvmorg-11.0.0-rc1, llvmorg-12-init, llvmorg-10.0.1, llvmorg-10.0.1-rc4, llvmorg-10.0.1-rc3, llvmorg-10.0.1-rc2, llvmorg-10.0.1-rc1, llvmorg-10.0.0, llvmorg-10.0.0-rc6, llvmorg-10.0.0-rc5, llvmorg-10.0.0-rc4
# c53c2058 10-Mar-2020 Sterling Augustine <[email protected]>

Cache uwnind frame headers as they are found.

Summary:
This improves unwind performance quite substantially, and follows
a somewhat similar approach used in libgcc_s as described in the
thread here:

Cache uwnind frame headers as they are found.

Summary:
This improves unwind performance quite substantially, and follows
a somewhat similar approach used in libgcc_s as described in the
thread here:

https://gcc.gnu.org/ml/gcc/2005-02/msg00625.html

On certain extremely exception heavy internal tests, the time
drops from about 80 minutes to about five minutes.

Subscribers: libcxx-commits

Tags: #libc

Differential Revision: https://reviews.llvm.org/D75954

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