002eda7056
Compact unwind entries (CUEs) contain pointers to their respective function symbols. However, during the link process, it's far more useful to have pointers from the function symbol to the CUE than vice versa. This diff adds that pointer in the form of `Defined::compactUnwind`. In particular, when doing dead-stripping, we want to mark CUEs live when their function symbol is live; and when doing ICF, we want to dedup sections iff the symbols in that section have identical CUEs. In both cases, we want to be able to locate the symbols within a given section, as well as locate the CUEs belonging to those symbols. So this diff also adds `InputSection::symbols`. The ultimate goal of this refactor is to have ICF support dedup'ing functions with unwind info, but that will be handled in subsequent diffs. This diff focuses on simplifying `-dead_strip` -- `findFunctionsWithUnwindInfo` is no longer necessary, and `Defined::isLive()` is now a lot simpler. Moreover, UnwindInfoSection no longer has to check for dead CUEs -- we simply avoid adding them in the first place. Additionally, we now support stripping of dead LSDAs, which follows quite naturally since `markLive()` can now reach them via the CUEs. Reviewed By: #lld-macho, gkm Differential Revision: https://reviews.llvm.org/D109944
20 lines
503 B
ArmAsm
20 lines
503 B
ArmAsm
# REQUIRES: x86
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# RUN: rm -rf %t; mkdir %t
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# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %s -o %t/test.o
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# RUN: not %lld -dylib -framework CoreFoundation --icf=all %t/test.o 2>&1 | FileCheck %s
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# CHECK: error: {{.*}}test.o:(__cfstring): symbol _uh_oh at misaligned offset
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.cstring
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L_.str:
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.asciz "foo"
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.section __DATA,__cfstring
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.p2align 3
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L__unnamed_cfstring_:
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.quad ___CFConstantStringClassReference
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.long 1992 ## utf-8
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_uh_oh:
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.space 4
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.quad L_.str
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.quad 3 ## strlen
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