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This patch fixes LTO's RecordStreamer so that it records symbols in the MCExpr

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part of an asm .symver directive as being used. This prevents referenced
functions from being internalized and deleted.

Without the patch to LTOModule.cpp, the test case will produce the error:

LLVM ERROR: A @@ version cannot be undefined.

llvm-svn: 205221
This commit is contained in:
Tom Roeder 2014-03-31 16:59:13 +00:00
parent db61071b5a
commit deee9e4afd
2 changed files with 17 additions and 0 deletions
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1
lib/LTO/LTOModule.cpp
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@ -660,6 +660,7 @@ namespace {
void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) override {
// FIXME: should we handle aliases?
markDefined(*Symbol);
AddValueSymbols(Value);
}
bool EmitSymbolAttribute(MCSymbol *Symbol,
MCSymbolAttr Attribute) override {

16
test/LTO/symver-asm.ll Normal file
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@ -0,0 +1,16 @@
; RUN: llvm-as < %s >%t1
; RUN: llvm-lto -o %t2 %t1
; RUN: llvm-nm %t2 | FileCheck %s
target triple = "x86_64-unknown-linux-gnu"
module asm ".symver io_cancel_0_4,io_cancel@@LIBAIO_0.4"
; Even without -exported-symbol, io_cancel_0_4 should be noticed by LTOModule's
; RecordStreamer, so it shouldn't get eliminated. However, the object file will
; contain the aliased symver as well as the original.
define i32 @io_cancel_0_4() {
; CHECK: io_cancel@@LIBAIO_0.4
; CHECK: io_cancel_0_4
ret i32 0
}