From e92d74958c49e99953ddd5e2b92d0539a224174d Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Tue, 10 Sep 2019 13:25:20 -0400
Subject: [PATCH] lld: apply patch: [mach-o] Extend LC_DATA_IN_CODE support to
 x86_64

This applies 91864f82c7d7bd1a151fdfd076a3a67a2893b868 from LLVM trunk to
the embedded LLD.

Once Zig upgrades to LLD 10, there will be no difference between Zig's
fork and upstream, and Zig's fork can be dropped.
---
 .../ReaderWriter/MachO/ArchHandler_x86_64.cpp | 50 ++++++++++++++++---
 1 file changed, 42 insertions(+), 8 deletions(-)

diff --git a/deps/lld/lib/ReaderWriter/MachO/ArchHandler_x86_64.cpp b/deps/lld/lib/ReaderWriter/MachO/ArchHandler_x86_64.cpp
index 316b5bbc6f..687407049d 100644
--- a/deps/lld/lib/ReaderWriter/MachO/ArchHandler_x86_64.cpp
+++ b/deps/lld/lib/ReaderWriter/MachO/ArchHandler_x86_64.cpp
@@ -181,6 +181,20 @@ public:
                                 FindAddressForAtom addressForAtom,
                                 normalized::Relocations &relocs) override;
 
+  bool isDataInCodeTransition(Reference::KindValue refKind) override {
+    return refKind == modeCode || refKind == modeData;
+  }
+
+  Reference::KindValue dataInCodeTransitionStart(
+                                        const MachODefinedAtom &atom) override {
+    return modeData;
+  }
+
+  Reference::KindValue dataInCodeTransitionEnd(
+                                        const MachODefinedAtom &atom) override {
+    return modeCode;
+  }
+
 private:
   static const Registry::KindStrings _sKindStrings[];
   static const StubInfo              _sStubInfo;
@@ -188,6 +202,9 @@ private:
   enum X86_64Kind: Reference::KindValue {
     invalid,               /// for error condition
 
+    modeCode,              /// Content starting at this offset is code.
+    modeData,              /// Content starting at this offset is data.
+
     // Kinds found in mach-o .o files:
     branch32,              /// ex: call _foo
     ripRel32,              /// ex: movq _foo(%rip), %rax
@@ -242,24 +259,34 @@ private:
 };
 
 const Registry::KindStrings ArchHandler_x86_64::_sKindStrings[] = {
-  LLD_KIND_STRING_ENTRY(invalid), LLD_KIND_STRING_ENTRY(branch32),
-  LLD_KIND_STRING_ENTRY(ripRel32), LLD_KIND_STRING_ENTRY(ripRel32Minus1),
-  LLD_KIND_STRING_ENTRY(ripRel32Minus2), LLD_KIND_STRING_ENTRY(ripRel32Minus4),
+  LLD_KIND_STRING_ENTRY(invalid),
+  LLD_KIND_STRING_ENTRY(modeCode),
+  LLD_KIND_STRING_ENTRY(modeData),
+  LLD_KIND_STRING_ENTRY(branch32),
+  LLD_KIND_STRING_ENTRY(ripRel32),
+  LLD_KIND_STRING_ENTRY(ripRel32Minus1),
+  LLD_KIND_STRING_ENTRY(ripRel32Minus2),
+  LLD_KIND_STRING_ENTRY(ripRel32Minus4),
   LLD_KIND_STRING_ENTRY(ripRel32Anon),
   LLD_KIND_STRING_ENTRY(ripRel32Minus1Anon),
   LLD_KIND_STRING_ENTRY(ripRel32Minus2Anon),
   LLD_KIND_STRING_ENTRY(ripRel32Minus4Anon),
   LLD_KIND_STRING_ENTRY(ripRel32GotLoad),
   LLD_KIND_STRING_ENTRY(ripRel32GotLoadNowLea),
-  LLD_KIND_STRING_ENTRY(ripRel32Got), LLD_KIND_STRING_ENTRY(ripRel32Tlv),
+  LLD_KIND_STRING_ENTRY(ripRel32Got),
+  LLD_KIND_STRING_ENTRY(ripRel32Tlv),
   LLD_KIND_STRING_ENTRY(lazyPointer),
   LLD_KIND_STRING_ENTRY(lazyImmediateLocation),
-  LLD_KIND_STRING_ENTRY(pointer64), LLD_KIND_STRING_ENTRY(pointer64Anon),
-  LLD_KIND_STRING_ENTRY(delta32), LLD_KIND_STRING_ENTRY(delta64),
-  LLD_KIND_STRING_ENTRY(delta32Anon), LLD_KIND_STRING_ENTRY(delta64Anon),
+  LLD_KIND_STRING_ENTRY(pointer64),
+  LLD_KIND_STRING_ENTRY(pointer64Anon),
+  LLD_KIND_STRING_ENTRY(delta32),
+  LLD_KIND_STRING_ENTRY(delta64),
+  LLD_KIND_STRING_ENTRY(delta32Anon),
+  LLD_KIND_STRING_ENTRY(delta64Anon),
   LLD_KIND_STRING_ENTRY(negDelta64),
   LLD_KIND_STRING_ENTRY(negDelta32),
-  LLD_KIND_STRING_ENTRY(imageOffset), LLD_KIND_STRING_ENTRY(imageOffsetGot),
+  LLD_KIND_STRING_ENTRY(imageOffset),
+  LLD_KIND_STRING_ENTRY(imageOffsetGot),
   LLD_KIND_STRING_ENTRY(unwindFDEToFunction),
   LLD_KIND_STRING_ENTRY(unwindInfoToEhFrame),
   LLD_KIND_STRING_ENTRY(tlvInitSectionOffset),
@@ -601,6 +628,8 @@ void ArchHandler_x86_64::applyFixupFinal(
   case negDelta32:
     *loc32 = fixupAddress - targetAddress + ref.addend();
     return;
+  case modeCode:
+  case modeData:
   case lazyPointer:
     // Do nothing
     return;
@@ -720,6 +749,8 @@ void ArchHandler_x86_64::applyFixupRelocatable(const Reference &ref,
   case unwindInfoToEhFrame:
     llvm_unreachable("fixup implies __unwind_info");
     return;
+  case modeCode:
+  case modeData:
   case unwindFDEToFunction:
     // Do nothing for now
     return;
@@ -743,6 +774,9 @@ void ArchHandler_x86_64::appendSectionRelocations(
   assert(ref.kindArch() == Reference::KindArch::x86_64);
   uint32_t sectionOffset = atomSectionOffset + ref.offsetInAtom();
   switch (static_cast<X86_64Kind>(ref.kindValue())) {
+  case modeCode:
+  case modeData:
+    return;
   case branch32:
     appendReloc(relocs, sectionOffset, symbolIndexForAtom(*ref.target()), 0,
                 X86_64_RELOC_BRANCH | rPcRel | rExtern | rLength4);