Merging r344264:

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r344264 | mstorsjo | 2018-10-11 10:45:51 -0700 (Thu, 11 Oct 2018) | 8 lines

[COFF] Set proper pointer size alignment for LocalImportChunk

When these are accessed with load/store instructions on ARM64,
it becomes strictly necessary to have them properly aligned.

This fixes PR39228.

Differential Revision: https://reviews.llvm.org/D53128
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llvm-svn: 344920

lld/COFF/Chunks.h

@@ -345,7 +345,9 @@ class ImportThunkChunkARM64 : public Chunk {
 // See comments for DefinedLocalImport class.
 class LocalImportChunk : public Chunk {
 public:
-  explicit LocalImportChunk(Defined *S) : Sym(S) {}
+  explicit LocalImportChunk(Defined *S) : Sym(S) {
+    Alignment = Config->is64() ? 8 : 4;
+  }
   size_t getSize() const override;
   void getBaserels(std::vector<Baserel> *Res) override;
   void writeTo(uint8_t *Buf) const override;

lld/test/COFF/arm64-localimport-align.s

@@ -0,0 +1,24 @@
+// REQUIRES: aarch64
+// RUN: llvm-mc -filetype=obj -triple=aarch64-windows %s -o %t.obj
+// RUN: lld-link -entry:main -subsystem:console %t.obj -out:%t.exe
+// Don't check the output, just make sure it links fine and doesn't
+// error out due to a misaligned load.
+    .text
+    .globl main
+    .globl myfunc
+main:
+    adrp x8, __imp_myfunc
+    ldr  x0, [x8, :lo12:__imp_myfunc]
+    br   x0
+    ret
+myfunc:
+    ret
+
+    .section .rdata, "dr"
+    // Start the .rdata section with a 4 byte chunk, to expose the alignment
+    // of the next chunk in the section.
+mydata:
+    .byte 42
+    // The synthesized LocalImportChunk gets stored here in the .rdata
+    // section, but needs to get proper 8 byte alignment since it is a
+    // pointer, just like regular LookupChunks in the IAT.