Add an initial implementation of archive symbol table generation.

The symbol table has forward references in the file. Instead of allocating
a temporary buffer or counting the size and then writing, this implementation
writes a dummy value first and patches it once the final value is known.

There is room for performance improvement. I will implement them as soon as I
get some other features (like a ranlib mode) in.

llvm-svn: 186934

2 files changed, 18 insertions, 0 deletions

diff --git a/llvm/test/Object/Inputs/trivial-object-test2.elf-x86-64 b/llvm/test/Object/Inputs/trivial-object-test2.elf-x86-64
new file mode 100644
index 00000000000..9124518bd92
--- /dev/null
+++ b/llvm/test/Object/Inputs/trivial-object-test2.elf-x86-64
diff --git a/llvm/test/Object/archive-symtab.test b/llvm/test/Object/archive-symtab.test
new file mode 100644
index 00000000000..1cf0ce449d8
--- /dev/null
+++ b/llvm/test/Object/archive-symtab.test
@@ -0,0 +1,18 @@
+RUN: rm -f %t.a
+RUN: llvm-ar rcs %t.a %p/Inputs/trivial-object-test.elf-x86-64 %p/Inputs/trivial-object-test2.elf-x86-64
+RUN: llvm-nm -s %t.a | FileCheck %s
+
+CHECK: Archive map
+CHECK-NEXT: main in trivial-object-test.elf-x86-64
+CHECK-NEXT: foo in trivial-object-test2.elf-x86-64
+CHECK-NEXT: main in trivial-object-test2.elf-x86-64
+CHECK-NOT: bar
+
+CHECK: trivial-object-test.elf-x86-64:
+CHECK-NEXT:         U SomeOtherFunction
+CHECK-NEXT: 00000000 T main
+CHECK-NEXT:         U puts
+CHECK-NEXT: trivial-object-test2.elf-x86-64:
+CHECK-NEXT: 00000000 t bar
+CHECK-NEXT: 00000006 T foo
+CHECK-NEXT: 00000016 T main