From 01fa41a106ed0ff86c3b9ffe0843679211bf487c Mon Sep 17 00:00:00 2001
From: Alexey Samsonov <samsonov@google.com>
Date: Fri, 21 Sep 2012 07:08:08 +0000
Subject: [PATCH] Fix SymbolRef::getAddress implementation for ELF. The 'value'
 field in symbol table entry should be treated differently for relocatable and
 relocated files. This patch fixes symbol addresses printed by llvm-nm for
 executables and shared objects.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164365 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Object/ELF.h             | 13 ++++++++++++-
 include/llvm/Object/ObjectFile.h      |  2 ++
 test/Object/nm-shared-object.test     | 26 +++++++++++++++++---------
 test/Object/objdump-symbol-table.test |  8 ++++++++
 4 files changed, 39 insertions(+), 10 deletions(-)

diff --git a/include/llvm/Object/ELF.h b/include/llvm/Object/ELF.h
index 03a1417bedf..2e6a7d8c1fb 100644
--- a/include/llvm/Object/ELF.h
+++ b/include/llvm/Object/ELF.h
@@ -951,7 +951,18 @@ error_code ELFObjectFile<target_endianness, is64Bits>
   case ELF::STT_FUNC:
   case ELF::STT_OBJECT:
   case ELF::STT_NOTYPE:
-    Result = symb->st_value + (Section ? Section->sh_addr : 0);
+    bool IsRelocatable;
+    switch(Header->e_type) {
+    case ELF::ET_EXEC:
+    case ELF::ET_DYN:
+      IsRelocatable = false;
+      break;
+    default:
+      IsRelocatable = true;
+    }
+    Result = symb->st_value;
+    if (IsRelocatable && Section != 0)
+      Result += Section->sh_addr;
     return object_error::success;
   default:
     Result = UnknownAddressOrSize;
diff --git a/include/llvm/Object/ObjectFile.h b/include/llvm/Object/ObjectFile.h
index da4cef22665..1709974ac56 100644
--- a/include/llvm/Object/ObjectFile.h
+++ b/include/llvm/Object/ObjectFile.h
@@ -212,6 +212,8 @@ public:
   error_code getNext(SymbolRef &Result) const;
 
   error_code getName(StringRef &Result) const;
+  /// Returns the symbol virtual address (i.e. address at which it will be
+  /// mapped).
   error_code getAddress(uint64_t &Result) const;
   error_code getFileOffset(uint64_t &Result) const;
   error_code getSize(uint64_t &Result) const;
diff --git a/test/Object/nm-shared-object.test b/test/Object/nm-shared-object.test
index b361df53555..a57b9401ad4 100644
--- a/test/Object/nm-shared-object.test
+++ b/test/Object/nm-shared-object.test
@@ -1,15 +1,23 @@
 RUN: llvm-nm -D %p/Inputs/shared-object-test.elf-i386 \
-RUN:         | FileCheck %s -check-prefix ELF
+RUN:         | FileCheck %s -check-prefix ELF-32
 RUN: llvm-nm -D %p/Inputs/shared-object-test.elf-x86-64 \
-RUN:         | FileCheck %s -check-prefix ELF
+RUN:         | FileCheck %s -check-prefix ELF-64
 
 ; Note: tls_sym should be 'D' (not '?'), but TLS is not
 ; yet recognized by ObjectFile.
 
-ELF: {{[0-9a-f]+}} A __bss_start
-ELF: {{[0-9a-f]+}} A _edata
-ELF: {{[0-9a-f]+}} A _end
-ELF: {{[0-9a-f]+}} B common_sym
-ELF: {{[0-9a-f]+}} D defined_sym
-ELF: {{[0-9a-f]+}} T global_func
-ELF:               ? tls_sym
+ELF-32: 0012c8 A __bss_start
+ELF-32: 0012c8 A _edata
+ELF-32: 0012cc A _end
+ELF-32: 0012c8 B common_sym
+ELF-32: 0012c4 D defined_sym
+ELF-32: 0001f0 T global_func
+ELF-32:        ? tls_sym
+
+ELF-64: 200454 A __bss_start
+ELF-64: 200454 A _edata
+ELF-64: 200458 A _end
+ELF-64: 200454 B common_sym
+ELF-64: 200450 D defined_sym
+ELF-64: 0002f0 T global_func
+ELF-64:        ? tls_sym
diff --git a/test/Object/objdump-symbol-table.test b/test/Object/objdump-symbol-table.test
index 989ec04a8dd..c94b0777355 100644
--- a/test/Object/objdump-symbol-table.test
+++ b/test/Object/objdump-symbol-table.test
@@ -4,6 +4,8 @@ RUN: llvm-objdump -t %p/Inputs/trivial-object-test.elf-i386 \
 RUN:              | FileCheck %s -check-prefix ELF-i386
 RUN: llvm-objdump -t %p/Inputs/trivial-object-test.macho-i386 \
 RUN:              | FileCheck %s -check-prefix macho-i386
+RUN: llvm-objdump -t %p/Inputs/shared-object-test.elf-i386 \
+RUN:              | FileCheck %s -check-prefix ELF-shared
 
 COFF-i386: file format
 COFF-i386: SYMBOL TABLE:
@@ -31,3 +33,9 @@ macho-i386: SYMBOL TABLE:
 macho-i386: 00000000 g     F __TEXT,__text  00000024 _main
 macho-i386: 00000000         *UND*  00000000 _SomeOtherFunction
 macho-i386: 00000000         *UND*  00000000 _puts
+
+ELF-shared: shared-object-test.elf-i386:     file format
+ELF-shared: SYMBOL TABLE:
+ELF-shared: 00000200 l     F .text 00000003 local_func
+ELF-shared: 000012c4 g       .data 00000004 defined_sym
+ELF-shared: 000001f0 g     F .text 00000003 global_func
-- 
2.34.1