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[LLD][ELF] - Report a location for symbols from the linker script when reporting an error.

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When we report an error for symbols defined in the linker script,
we do not report the location properly.

For example:

ld.lld: error: relocation R_AARCH64_CALL26 cannot refer to absolute symbol: aliasto__text
>>> defined in <internal>
>>> referenced by rtoabs.o:(.text+0x4)

This patch fixes that.

Differential revision: https://reviews.llvm.org/D55360

llvm-svn: 349612
This commit is contained in:
George Rimar 2018-12-19 10:19:40 +00:00
parent c521ac3a44
commit 751e6e1cf5
2 changed files with 30 additions and 2 deletions
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17
lld/ELF/Relocations.cpp
View File

@ -66,6 +66,14 @@ using namespace llvm::support::endian;
using namespace lld;
using namespace lld::elf;
static Optional<std::string> getLinkerScriptLocation(const Symbol &Sym) {
for (BaseCommand *Base : Script->SectionCommands)
if (auto *Cmd = dyn_cast<SymbolAssignment>(Base))
if (Cmd->Sym == &Sym)
return Cmd->Location;
return None;
}
// Construct a message in the following format.
//
// >>> defined in /home/alice/src/foo.o
@ -73,8 +81,13 @@ using namespace lld::elf;
// >>> /home/alice/src/bar.o:(.text+0x1)
static std::string getLocation(InputSectionBase &S, const Symbol &Sym,
uint64_t Off) {
std::string Msg =
"\n>>> defined in " + toString(Sym.File) + "\n>>> referenced by ";
std::string Msg = "\n>>> defined in ";
if (Sym.File)
Msg += toString(Sym.File);
else if (Optional<std::string> Loc = getLinkerScriptLocation(Sym))
Msg += *Loc;
Msg += "\n>>> referenced by ";
std::string Src = S.getSrcMsg(Sym, Off);
if (!Src.empty())
Msg += Src + "\n>>> ";

15
lld/test/ELF/linkerscript/symbol-location.s Normal file
View File

@ -0,0 +1,15 @@
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t.o
# RUN: echo "foo = 1;" > %t.script
# RUN: not ld.lld -pie -o %t --script %t.script %t.o 2>&1 | FileCheck %s
## Here we check that symbol 'foo' location is reported properly.
# CHECK: error: relocation R_X86_64_PLT32 cannot refer to absolute symbol: foo
# CHECK: >>> defined in {{.*}}.script:1
# CHECK: >>> referenced by {{.*}}.o:(.text+0x1)
.text
.globl _start
_start:
call foo@PLT