[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
Cr-Mirrored-From: https://chromium.googlesource.com/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: fb1abe00635c1ec28e55921709904d5ca2e86a74
diff --git a/src/FrameHeaderCache.hpp b/src/FrameHeaderCache.hpp
index 813fcd4..54d5d33 100644
--- a/src/FrameHeaderCache.hpp
+++ b/src/FrameHeaderCache.hpp
@@ -32,7 +32,7 @@
class _LIBUNWIND_HIDDEN FrameHeaderCache {
struct CacheEntry {
uintptr_t LowPC() { return Info.dso_base; };
- uintptr_t HighPC() { return Info.dso_base + Info.dwarf_section_length; };
+ uintptr_t HighPC() { return Info.dso_base + Info.text_segment_length; };
UnwindInfoSections Info;
CacheEntry *Next;
};