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[MC][MachO] Emit an error for emitting relocations of the form -SYM + cst

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Emit an error for an unsupported relocation. mach-o relocations can't
encode the form -SYM + cst.

Differential Revision: https://reviews.llvm.org/D58944

llvm-svn: 355527
This commit is contained in:
Francis Visoiu Mistrih 2019-03-06 18:10:41 +00:00
parent f565f6bfc6
commit f15c596d62
2 changed files with 20 additions and 0 deletions
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15
lib/MC/MachObjectWriter.cpp
View File

@ -13,6 +13,7 @@
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDirectives.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFixupKindInfo.h"
@ -448,11 +449,25 @@ void MachObjectWriter::writeLinkerOptionsLoadCommand(
assert(W.OS.tell() - Start == Size);
}
static bool isFixupTargetValid(const MCValue &Target) {
// Target is (LHS - RHS + cst).
// We don't support the form where LHS is null: -RHS + cst
if (!Target.getSymA() && Target.getSymB())
return false;
return true;
}
void MachObjectWriter::recordRelocation(MCAssembler &Asm,
const MCAsmLayout &Layout,
const MCFragment *Fragment,
const MCFixup &Fixup, MCValue Target,
uint64_t &FixedValue) {
if (!isFixupTargetValid(Target)) {
Asm.getContext().reportError(Fixup.getLoc(),
"unsupported relocation expression");
return;
}
TargetObjectWriter->recordRelocation(this, Asm, Layout, Fragment, Fixup,
Target, FixedValue);
}

5
test/MC/MachO/bad-reloc.s Normal file
View File

@ -0,0 +1,5 @@
// RUN: not llvm-mc -triple x86_64-apple-darwin %s -filetype=obj -o - 2>&1 | FileCheck %s
.quad (0 - undef)
// CHECK: error: unsupported relocation expression