[PATCH] D158004: llvm-nm ignore the Import symbol file for the --export-symbol option.

[Digger Lin via Phabricator via llvm-commits]

DiggerLin updated this revision to Diff 552000.
DiggerLin marked an inline comment as done.
DiggerLin added a comment.

address minor comment.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D158004/new/

https://reviews.llvm.org/D158004

Files:
  llvm/test/tools/llvm-nm/XCOFF/export-symbols.test
  llvm/tools/llvm-nm/llvm-nm.cpp


Index: llvm/tools/llvm-nm/llvm-nm.cpp
===================================================================
--- llvm/tools/llvm-nm/llvm-nm.cpp
+++ llvm/tools/llvm-nm/llvm-nm.cpp
@@ -2262,6 +2262,13 @@
   if (error(BufferOrErr.getError(), Filename))
     return SymbolList;
 
+  // Ignore AIX linker import files (these files start with "#!"), when
+  // exporting symbols.
+  const char *BuffStart = (*BufferOrErr)->getBufferStart();
+  if (ExportSymbols && (*BufferOrErr)->getBufferSize() >= 2 &&
+      BuffStart[0] == '#' && BuffStart[1] == '!')
+    return SymbolList;
+
   LLVMContext Context;
   LLVMContext *ContextPtr = NoLLVMBitcode ? nullptr : &Context;
   Expected<std::unique_ptr<Binary>> BinaryOrErr =
Index: llvm/test/tools/llvm-nm/XCOFF/export-symbols.test
===================================================================
--- llvm/test/tools/llvm-nm/XCOFF/export-symbols.test
+++ llvm/test/tools/llvm-nm/XCOFF/export-symbols.test
@@ -52,6 +52,11 @@
 # RUN: yaml2obj -DFLAG=0x2000 --docnum=2 %s -o %t_shared.o
 # RUN: llvm-nm --export-symbols %t_shared.o | count 0
 
+## Test that llvm-nm ignores AIX linker import files when using
+## --export-symbols.  These start with "#!".
+# RUN: echo "#!" > imp.txt
+# RUN: llvm-nm --export-symbols imp.txt 2>&1 | FileCheck --allow-empty --implicit-check-not={{.}} %s
+
 --- !XCOFF
 FileHeader:
   MagicNumber:       0x1DF


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