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| author | Kyle Huey <khuey@pernos.co> | 2023-05-15 15:08:18 +0100 |
|---|---|---|
| committer | J. Ryan Stinnett <jryans@gmail.com> | 2023-05-15 15:10:02 +0100 |
| commit | d421f5226048e4a5d88aab157d0f4d434c43f208 (patch) | |
| tree | ff46016f7572fcb4967fab3df40d5b71c6f5fea5 /clang/lib/Frontend/CompilerInvocation.cpp | |
| parent | f516ad6154f77e417e9eab307cce63fe0416af64 (diff) | |
| download | llvm-d421f5226048e4a5d88aab157d0f4d434c43f208.zip llvm-d421f5226048e4a5d88aab157d0f4d434c43f208.tar.gz llvm-d421f5226048e4a5d88aab157d0f4d434c43f208.tar.bz2 | |
[X86] Use the CFA as the DWARF frame base for better variable locations around calls.
Prior to this patch, for the DWARF frame base LLVM uses the frame pointer
register if available, otherwise the stack pointer register. If the stack
pointer register is being used and a call or other code modifies the stack
pointer during the body of the function this results in the locations being
wrong and the debugger displaying the wrong values for variables.
By using DW_OP_call_frame_cfa in these situations the emitted location for
the variable will automatically handle changes in the stack pointer.
The CFA needs to be adjusted for the offset between the frame pointer/stack
pointer to allow the variable locations themselves to remain unchanged by
this patch.
Reviewed By: #debug-info, scott.linder, jryans
Differential Revision: https://reviews.llvm.org/D143463
Diffstat (limited to 'clang/lib/Frontend/CompilerInvocation.cpp')
0 files changed, 0 insertions, 0 deletions