[llvm-objcopy] - Reimplement strip-dwo-groups.test to stop using the precompiled object.

When llvm-copy removes .dwo sections the index of symbol table,
the indices of the symbols and the indices of the sections which go
after the removed ones changes. That affects on SHT_GROUP sections,
which needs to be updated.

Initially this test used a precompiled object, I rewrote it to use YAML
and improved a bit.

Differential revision: https://reviews.llvm.org/D65273

llvm-svn: 367202

llvm/test/tools/llvm-objcopy/ELF/strip-dwo-groups.test

@@ -1,40 +1,76 @@
-# RUN: cp %p/Inputs/groups.o %t
+# RUN: yaml2obj %s -o %t
 # RUN: llvm-objcopy --strip-dwo %t
-# RUN: llvm-readobj --elf-section-groups %t | FileCheck %s
+# RUN: llvm-readobj --symbols -S --elf-section-groups %t | FileCheck %s --implicit-check-not=debug_
 
-// Source code of groups.o:
-//
-// template <class T>
-// struct S {
-//    static constexpr T X = T(1);
-//    T getX() { return X; }
-// };
-// void f() {
-//  S<int> A;
-//  S<double> B;
-//  int a = A.getX();
-//  int b = B.getX();
-// }
-//
-// clang -g -gsplit-dwarf -std=c++11 -c groups.cpp -o groups.o
+## `llvm-objcopy --strip-dwo` strips out dwo sections, as a result, the index of 
+## the symbol table, the indices of the symbols and the indices of the sections
+## which go after the removed ones will change. Consequently, the fields 
+## Link, Info and the content of .group need to be updated.
 
-// `llvm-objcopy --strip-dwo` strips out dwo sections, as a result, the index of 
-// the symbol table, the indices of the symbols and the indices of the sections 
-// which go after the removed ones will change. Consequently, the fields 
-// Link, Info and the content of .group need to be updated. In the past 
-// `llvm-objcopy --strip-dwo` used to produce invalid binaries with 
-// broken .group section, this test verifies the correctness of 
-// Link, Info and the content of this section.
+# CHECK:      Groups {
+# CHECK:       Name: .group (1)
+# CHECK-NEXT:  Index: 1{{$}}
+# CHECK-NEXT:  Link: 6
+# CHECK-NEXT:  Info: 2
+# CHECK-NEXT:  Type: COMDAT (0x1)
+# CHECK-NEXT:  Signature: group1
+# CHECK-NEXT:  Section(s) in group [
+# CHECK-NEXT:    .text.group1 (3)
+# CHECK-NEXT:  ]
 
-CHECK:          Name: .group (179)
-CHECK-NEXT:     Index: 1{{$}}
-CHECK-NEXT:     Link: 19
-CHECK-NEXT:     Info: 14
-CHECK:          .text._ZN1SIiE4getXEv
+# CHECK:      Name: .group (1)
+# CHECK-NEXT: Index: 2{{$}}
+# CHECK-NEXT: Link: 6
+# CHECK-NEXT: Info: 1
+# CHECK-NEXT: Type: COMDAT (0x1)
+# CHECK-NEXT: Signature: group2
+# CHECK-NEXT: Section(s) in group [
+# CHECK-NEXT:   .text.group2 (4)
+# CHECK-NEXT:   .rela.text.group2 (5)
+# CHECK-NEXT: ]
 
-CHECK:          Name: .group (179)
-CHECK-NEXT:     Index: 2{{$}}
-CHECK-NEXT:     Link: 19
-CHECK-NEXT:     Info: 13
-CHECK:          .text._ZN1SIdE4getXEv
-CHECK-NEXT:     .rela.text._ZN1SIdE4getXEv
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_REL
+  Machine: EM_X86_64
+Sections:
+  - Name: .debug_before.dwo
+    Type: SHT_PROGBITS
+  - Name: .group
+    Type: SHT_GROUP
+    Link: .symtab
+    Info: group1
+    Members:
+      - SectionOrType: GRP_COMDAT
+      - SectionOrType: .text.group1
+  - Name:  .text.group1
+    Type:  SHT_PROGBITS
+    Flags: [ SHF_ALLOC, SHF_EXECINSTR, SHF_GROUP ]
+  - Name: '.group [1]'
+    Type: SHT_GROUP
+    Link: .symtab
+    Info: group2
+    Members:
+      - SectionOrType: GRP_COMDAT
+      - SectionOrType: .text.group2
+      - SectionOrType: .rela.text.group2
+  - Name:  .text.group2
+    Type:  SHT_PROGBITS
+    Flags: [ SHF_ALLOC, SHF_EXECINSTR, SHF_GROUP ]
+  - Name:  .rela.text.group2
+    Type:  SHT_RELA
+    Flags: [ SHF_GROUP ]
+    Info:  .text.group2
+  - Name: .debug_after.dwo
+    Type: SHT_PROGBITS
+Symbols:
+  - Name:    debug_before
+    Section: .debug_before.dwo
+  - Name:    group2
+    Section: .text.group2
+  - Name:    group1
+    Section: .text.group1
+  - Name:    debug_after
+    Section: .debug_after.dwo