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Emit function alias to data as a function symbol.

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CFI emits jump slots for indirect functions as a byte array
constant, and declares function-typed aliases to these constants.

This change fixes AsmPrinter to emit these aliases as function
symbols and not data symbols.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254674 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evgeniy Stepanov 2015-12-04 00:45:43 +00:00
parent 21aabdad38
commit cb1cb45c60
2 changed files with 17 additions and 0 deletions
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5
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
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@ -1187,6 +1187,11 @@ bool AsmPrinter::doFinalization(Module &M) {
else
assert(Alias.hasLocalLinkage() && "Invalid alias linkage");
// Set the symbol type to function if the alias has a function type.
// This affects codegen when the aliasee is not a function.
if (Alias.getType()->getPointerElementType()->isFunctionTy())
OutStreamer->EmitSymbolAttribute(Name, MCSA_ELF_TypeFunction);
EmitVisibility(Name, Alias.getVisibility());
// Emit the directives as assignments aka .set:

12
test/CodeGen/Generic/function-alias.ll Normal file
View File

@ -0,0 +1,12 @@
; RUN: llc < %s | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; "data" constant
@0 = private constant <{ i8, i8 }> <{i8 15, i8 11}>, section ".text"
; function-typed alias
@ud2 = alias void (), bitcast (<{ i8, i8 }>* @0 to void ()*)
; Check that "ud2" is emitted as a function symbol.
; CHECK: .type{{.*}}ud2,@function