Add support for LTO in klp-build toolchain. The key changes are to the
symbol correlation logic.Basically, we want to:
1. Match symbols with differerent .llvm.<hash> suffixes, e.g., foo.llvm.123
to foo.llvm.456.
2. Match local symbols with promoted global symbols, e.g., local foo
with global foo.llvm.123.
1/7 and 2/7 are small cleanup/fix for existing code.
3/7 through 7/7 contains the core logic changes to correlate_symbols().
Changes v3 => v4:
1. Minor fixes in patches 1, 3, 7.
2. Only keep patches 1-7 for now, as there is ongoing discussion about the
test infrastructure.
Changes v2 => v3:
1. Fix a bug in global => local correlations (patch 7/8).
2. Remove a WARN().
3. Some empty line changes.
Changes v1 => v2:
1. Error out on ambiguous .llvm.<hash>
Song Liu (7):
objtool/klp: Remove redundant strcmp() in correlate_symbols()
objtool/klp: Remove trailing '_' in demangle_name()
objtool/klp: Use sym->demangled_name for symbol_name hash
objtool/klp: Also demangle global objects
objtool/klp: Remove .llvm suffix in demangle_name()
objtool/klp: Match symbols based on demangled_name for global
variables
objtool/klp: Correlate locals to globals
tools/objtool/elf.c | 95 ++++++++++++++++++++++-------
tools/objtool/include/objtool/elf.h | 3 +
tools/objtool/klp-diff.c | 89 ++++++++++++++++++++++++++-
3 files changed, 165 insertions(+), 22 deletions(-)
--
2.52.0
