forked from OSchip/llvm-project
24a669d225
This adds back r204781.
Original message:
Aliases are just another name for a position in a file. As such, the
regular symbol resolutions are not applied. For example, given
define void @my_func() {
ret void
}
@my_alias = alias weak void ()* @my_func
@my_alias2 = alias void ()* @my_alias
We produce without this patch:
.weak my_alias
my_alias = my_func
.globl my_alias2
my_alias2 = my_alias
That is, in the resulting ELF file my_alias, my_func and my_alias are
just 3 names pointing to offset 0 of .text. That is *not* the
semantics of IR linking. For example, linking in a
@my_alias = alias void ()* @other_func
would require the strong my_alias to override the weak one and
my_alias2 would end up pointing to other_func.
There is no way to represent that with aliases being just another
name, so the best solution seems to be to just disallow it, converting
a miscompile into an error.
llvm-svn: 204934
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|---|---|---|
| .. | ||
| AddressSanitizer.cpp | ||
| BoundsChecking.cpp | ||
| CMakeLists.txt | ||
| DataFlowSanitizer.cpp | ||
| DebugIR.cpp | ||
| DebugIR.h | ||
| GCOVProfiling.cpp | ||
| Instrumentation.cpp | ||
| LLVMBuild.txt | ||
| Makefile | ||
| MaximumSpanningTree.h | ||
| MemorySanitizer.cpp | ||
| ThreadSanitizer.cpp | ||