[ELF] Read IFUNC symbols correctly as typeResolver.

llvm-svn: 173299

lld/lib/Driver/CoreOptions.td

@@ -1,5 +1,6 @@
 include "llvm/Option/OptParser.td"
 
+def core : Flag<["-"], "core">;
 def flavor : Separate<["-"], "flavor">;
 def target : Separate<["-"], "target">, HelpText<"Target triple to link for">;
 def mllvm : Separate<["-"], "mllvm">, HelpText<"Options to pass to LLVM">;

lld/lib/ReaderWriter/ELF/AtomsELF.h

@@ -236,6 +236,9 @@ public:
     ContentType ret = typeUnknown;
     uint64_t flags = _section->sh_flags;
 
+    if (_symbol->getType() == llvm::ELF::STT_GNU_IFUNC)
+      return typeResolver;
+
     if (_symbol->st_shndx == llvm::ELF::SHN_COMMON)
       return typeZeroFill;
 

lld/test/elf/Inputs/ifunc.S

@@ -0,0 +1,14 @@
+  .text
+  .globl hey;
+  .type hey, @function;
+hey:
+  .type hey, @gnu_indirect_function;
+  leaq  __hey_1(%rip), %rax
+  ret
+
+  .text
+  .type __hey_1, @function;
+  .globl __hey_1;
+__hey_1:
+  movq $42, %rax
+  ret

lld/test/elf/ifunc.test

@@ -0,0 +1,6 @@
+RUN: lld -core -target x86_64-linux -emit-yaml -output=- %p/Inputs/ifunc.x86-64 \
+RUN: | FileCheck %s
+
+CHECK: name: hey
+CHECK: scope: global
+CHECK: type: resolver