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f165cf7ce8
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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204934 91177308-0d34-0410-b5e6-96231b3b80d8
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|---|---|---|
| .. | ||
| Disassembler | ||
| InstPrinter | ||
| MCTargetDesc | ||
| TargetInfo | ||
| CMakeLists.txt | ||
| LLVMBuild.txt | ||
| Makefile | ||
| README.txt | ||
| XCore.h | ||
| XCore.td | ||
| XCoreAsmPrinter.cpp | ||
| XCoreCallingConv.td | ||
| XCoreFrameLowering.cpp | ||
| XCoreFrameLowering.h | ||
| XCoreFrameToArgsOffsetElim.cpp | ||
| XCoreInstrFormats.td | ||
| XCoreInstrInfo.cpp | ||
| XCoreInstrInfo.h | ||
| XCoreInstrInfo.td | ||
| XCoreISelDAGToDAG.cpp | ||
| XCoreISelLowering.cpp | ||
| XCoreISelLowering.h | ||
| XCoreLowerThreadLocal.cpp | ||
| XCoreMachineFunctionInfo.cpp | ||
| XCoreMachineFunctionInfo.h | ||
| XCoreMCInstLower.cpp | ||
| XCoreMCInstLower.h | ||
| XCoreRegisterInfo.cpp | ||
| XCoreRegisterInfo.h | ||
| XCoreRegisterInfo.td | ||
| XCoreSelectionDAGInfo.cpp | ||
| XCoreSelectionDAGInfo.h | ||
| XCoreSubtarget.cpp | ||
| XCoreSubtarget.h | ||
| XCoreTargetMachine.cpp | ||
| XCoreTargetMachine.h | ||
| XCoreTargetObjectFile.cpp | ||
| XCoreTargetObjectFile.h | ||
| XCoreTargetStreamer.h | ||
| XCoreTargetTransformInfo.cpp | ||
To-do ----- * Instruction encodings * Tailcalls * Investigate loop alignment * Add builtins