cherry-pick bugfixes for SR-1161 #272
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rdar://problem/56924558 (cherry picked from commit d24bce5)
When we switched to the LLVM .debug_line parser, the .dSYM-style path remapping logic stopped working for relative paths because of how RemapSourceFile silently fails for relative paths. This patch both makes the code more readable and fixes this particular bug. One interesting thing I learned is that Module::RemapSourceFile() is a macOS-only code path that operates on on the lldb::Module level and is completely separate from target.source-map, which operates on a per-Target level. Differential Revision: https://reviews.llvm.org/D70037 rdar://problem/56924558 (cherry picked from commit da83e96) Conflicts: lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
(cherry picked from commit 646d927)
(cherry picked from commit 454acae)
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Apr 15, 2022
…n a loop
When untagging the stack, the compiler may emit a sequence like:
```
.LBB0_1:
st2g sp, [sp], #32
sub x8, x8, #32
cbnz x8, .LBB0_1
stg sp, [sp], #16
```
These stack adjustments cannot be described by CFI instructions.
This patch disables merging of SP update with untagging, i.e. makes the
compiler use an additional scratch register (there should be plenty
available at this point as we are in the epilogue) and generate:
```
mov x9, sp
mov x8, #256
stg x9, [x9], #16
.LBB0_1:
sub x8, x8, #32
st2g x9, [x9], #32
cbnz x8, .LBB0_1
add sp, sp, #272
```
Merging is disabled only when we need to generate asynchronous unwind
tables.
Reviewed By: eugenis
Differential Revision: https://reviews.llvm.org/D114548
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