[readobj] Handle ELF files with no section table or with no program headers.

This adds support for finding the dynamic table and dynamic symbol table via
the section table or the program header table. If there's no section table an
attempt is made to figure out the length of the dynamic symbol table.

llvm-svn: 260488

6 files changed, 203 insertions, 10 deletions

diff --git a/llvm/test/Object/Inputs/corrupt-invalid-virtual-addr.elf.x86-64 b/llvm/test/Object/Inputs/corrupt-invalid-virtual-addr.elf.x86-64
deleted file mode 100755
index 58d995933ec..00000000000
--- a/llvm/test/Object/Inputs/corrupt-invalid-virtual-addr.elf.x86-64
+++ /dev/null
diff --git a/llvm/test/Object/corrupt.test b/llvm/test/Object/corrupt.test
index 0d9aad378f8..005f86fb744 100644
--- a/llvm/test/Object/corrupt.test
+++ b/llvm/test/Object/corrupt.test
@@ -38,24 +38,17 @@ RUN:   FileCheck --check-prefix=PHENTSIZE %s
 
 PHENTSIZE: Invalid program header size
 
-RUN: not llvm-readobj -dynamic-table \
-RUN:   %p/Inputs/corrupt-invalid-virtual-addr.elf.x86-64 2>&1 | \
-RUN:   FileCheck --check-prefix=VIRTADDR %s
-
-VIRTADDR: Virtual address is not in any segment
-
-
 RUN: not llvm-readobj -dyn-relocations \
 RUN:   %p/Inputs/corrupt-invalid-relocation-size.elf.x86-64 2>&1 | \
 RUN:   FileCheck --check-prefix=RELOC %s
 
-RELOC:  Invalid relocation entry size
+RELOC:  Invalid entity size
 
 RUN: not llvm-readobj -dyn-relocations \
 RUN:   %p/Inputs/corrupt-invalid-dynamic-table-size.elf.x86-64 2>&1 | \
 RUN:   FileCheck --check-prefix=DYN-TABLE-SIZE %s
 
-DYN-TABLE-SIZE:  Invalid dynamic table size
+DYN-TABLE-SIZE:  Invalid entity size
 
 
 RUN: not llvm-readobj -dyn-relocations \
diff --git a/llvm/test/Object/invalid.test b/llvm/test/Object/invalid.test
index cc5cd68304c..a32c621cca6 100644
--- a/llvm/test/Object/invalid.test
+++ b/llvm/test/Object/invalid.test
@@ -35,9 +35,11 @@ SECTION-NEXT:    AddressAlignment:
 SECTION-NEXT:    EntrySize: 32
 
 RUN: not llvm-readobj -t %p/Inputs/invalid-sh_entsize.elf 2>&1 | FileCheck --check-prefix=INVALID-SYM-SIZE %s
-RUN: not llvm-readobj --dyn-symbols %p/Inputs/invalid-sh_entsize.elf 2>&1 | FileCheck --check-prefix=INVALID-SYM-SIZE %s
 INVALID-SYM-SIZE: Invalid symbol size
 
+RUN: not llvm-readobj --dyn-symbols %p/Inputs/invalid-sh_entsize.elf 2>&1 | FileCheck --check-prefix=INVALID-DYNSYM-SIZE %s
+INVALID-DYNSYM-SIZE: Invalid entity size
+
 RUN: not llvm-readobj -t %p/Inputs/invalid-section-index.elf 2>&1 | FileCheck --check-prefix=INVALID-SECTION-INDEX %s
 
 INVALID-SECTION-INDEX: Invalid section index
diff --git a/llvm/test/tools/llvm-readobj/Inputs/dynamic-table-exe-no-phdrs.x86 b/llvm/test/tools/llvm-readobj/Inputs/dynamic-table-exe-no-phdrs.x86
new file mode 100644
index 00000000000..1571da9f650
--- /dev/null
+++ b/llvm/test/tools/llvm-readobj/Inputs/dynamic-table-exe-no-phdrs.x86
diff --git a/llvm/test/tools/llvm-readobj/Inputs/dynamic-table-exe-no-shdrs.x86 b/llvm/test/tools/llvm-readobj/Inputs/dynamic-table-exe-no-shdrs.x86
new file mode 100644
index 00000000000..def4a7afaf2
--- /dev/null
+++ b/llvm/test/tools/llvm-readobj/Inputs/dynamic-table-exe-no-shdrs.x86
diff --git a/llvm/test/tools/llvm-readobj/dynamic-symbols.test b/llvm/test/tools/llvm-readobj/dynamic-symbols.test
new file mode 100644
index 00000000000..0a06a24f525
--- /dev/null
+++ b/llvm/test/tools/llvm-readobj/dynamic-symbols.test
@@ -0,0 +1,198 @@
+RUN: llvm-readobj -dyn-symbols -dynamic-table \
+RUN:   %S/Inputs/dynamic-table-exe-no-shdrs.x86 | FileCheck %s
+RUN: llvm-readobj -dyn-symbols -dynamic-table \
+RUN:   %S/Inputs/dynamic-table-exe-no-phdrs.x86 | FileCheck %s
+
+CHECK:      File:
+CHECK-NEXT: Format: ELF32-i386
+CHECK-NEXT: Arch: i386
+CHECK-NEXT: AddressSize: 32bit
+CHECK-NEXT: LoadName:
+CHECK-NEXT: DynamicSymbols [
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: @
+CHECK-NEXT:     Value: 0x0
+CHECK-NEXT:     Size: 0
+CHECK-NEXT:     Binding: Local
+CHECK-NEXT:     Type: None
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section: Undefined
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: __gmon_start__@
+CHECK-NEXT:     Value: 0x0
+CHECK-NEXT:     Size: 0
+CHECK-NEXT:     Binding: Weak
+CHECK-NEXT:     Type: None
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section: Undefined
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: _Jv_RegisterClasses@
+CHECK-NEXT:     Value: 0x0
+CHECK-NEXT:     Size: 0
+CHECK-NEXT:     Binding: Weak
+CHECK-NEXT:     Type: None
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section: Undefined
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: __libc_start_main@
+CHECK-NEXT:     Value: 0x0
+CHECK-NEXT:     Size: 0
+CHECK-NEXT:     Binding: Global
+CHECK-NEXT:     Type: Function
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section: Undefined
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: _ITM_deregisterTMCloneTable@
+CHECK-NEXT:     Value: 0x0
+CHECK-NEXT:     Size: 0
+CHECK-NEXT:     Binding: Weak
+CHECK-NEXT:     Type: None
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section: Undefined
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: _ITM_registerTMCloneTable@
+CHECK-NEXT:     Value: 0x0
+CHECK-NEXT:     Size: 0
+CHECK-NEXT:     Binding: Weak
+CHECK-NEXT:     Type: None
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section: Undefined
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: _ZNSt14basic_ifstreamIcSt11char_traitsIcEED1Ev@
+CHECK-NEXT:     Value: 0x0
+CHECK-NEXT:     Size: 0
+CHECK-NEXT:     Binding: Global
+CHECK-NEXT:     Type: Function
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section: Undefined
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: _ZNSt14basic_ifstreamIcSt11char_traitsIcEEC1EPKcSt13_Ios_Openmode@
+CHECK-NEXT:     Value: 0x0
+CHECK-NEXT:     Size: 0
+CHECK-NEXT:     Binding: Global
+CHECK-NEXT:     Type: Function
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section: Undefined
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: puts@
+CHECK-NEXT:     Value: 0x0
+CHECK-NEXT:     Size: 0
+CHECK-NEXT:     Binding: Global
+CHECK-NEXT:     Type: Function
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section: Undefined
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: __gxx_personality_v0@
+CHECK-NEXT:     Value: 0x0
+CHECK-NEXT:     Size: 0
+CHECK-NEXT:     Binding: Global
+CHECK-NEXT:     Type: Function
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section: Undefined
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: _Unwind_Resume@
+CHECK-NEXT:     Value: 0x0
+CHECK-NEXT:     Size: 0
+CHECK-NEXT:     Binding: Global
+CHECK-NEXT:     Type: Function
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section: Undefined
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: __cxa_finalize@
+CHECK-NEXT:     Value: 0x0
+CHECK-NEXT:     Size: 0
+CHECK-NEXT:     Binding: Weak
+CHECK-NEXT:     Type: Function
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section: Undefined
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: _end@
+CHECK-NEXT:     Value: 0x1B68
+CHECK-NEXT:     Size: 0
+CHECK-NEXT:     Binding: Global
+CHECK-NEXT:     Type: None
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section: Absolute
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: _edata@
+CHECK-NEXT:     Value: 0x1B64
+CHECK-NEXT:     Size: 0
+CHECK-NEXT:     Binding: Global
+CHECK-NEXT:     Type: None
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section: Absolute
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: _IO_stdin_used@
+CHECK-NEXT:     Value: 0x93C
+CHECK-NEXT:     Size: 4
+CHECK-NEXT:     Binding: Global
+CHECK-NEXT:     Type: Object
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section:
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: __bss_start@
+CHECK-NEXT:     Value: 0x1B64
+CHECK-NEXT:     Size: 0
+CHECK-NEXT:     Binding: Global
+CHECK-NEXT:     Type: None
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section: Absolute
+CHECK-NEXT:   }
+CHECK-NEXT:   Symbol {
+CHECK-NEXT:     Name: main@
+CHECK-NEXT:     Value: 0x850
+CHECK-NEXT:     Size: 81
+CHECK-NEXT:     Binding: Global
+CHECK-NEXT:     Type: Function
+CHECK-NEXT:     Other: 0
+CHECK-NEXT:     Section:
+CHECK-NEXT:   }
+CHECK-NEXT: ]
+CHECK-NEXT: DynamicSection [
+CHECK-NEXT:   Tag        Type                 Name/Value
+CHECK-NEXT:   0x00000001 NEEDED               SharedLibrary (libstdc++.so.6)
+CHECK-NEXT:   0x00000001 NEEDED               SharedLibrary (libgcc_s.so.1)
+CHECK-NEXT:   0x00000001 NEEDED               SharedLibrary (libc.so.6)
+CHECK-NEXT:   0x0000000C INIT                 0x62C
+CHECK-NEXT:   0x0000000D FINI                 0x920
+CHECK-NEXT:   0x00000019 INIT_ARRAY           0x19FC
+CHECK-NEXT:   0x0000001B INIT_ARRAYSZ         4
+CHECK-NEXT:   0x0000001A FINI_ARRAY           0x1A00
+CHECK-NEXT:   0x0000001C FINI_ARRAYSZ         4
+CHECK-NEXT:   0x00000004 HASH                 0x18C
+CHECK-NEXT:   0x6FFFFEF5 GNU_HASH             0x1E4
+CHECK-NEXT:   0x00000005 STRTAB               0x328
+CHECK-NEXT:   0x00000006 SYMTAB               0x218
+CHECK-NEXT:   0x0000000A STRSZ                408
+CHECK-NEXT:   0x0000000B SYMENT               16
+CHECK-NEXT:   0x00000015 DEBUG                0x0
+CHECK-NEXT:   0x00000003 PLTGOT               0x1B30
+CHECK-NEXT:   0x00000002 PLTRELSZ             64
+CHECK-NEXT:   0x00000014 PLTREL               REL
+CHECK-NEXT:   0x00000017 JMPREL               0x5EC
+CHECK-NEXT:   0x00000011 REL                  0x564
+CHECK-NEXT:   0x00000012 RELSZ                136
+CHECK-NEXT:   0x00000013 RELENT               8
+CHECK-NEXT:   0x00000016 TEXTREL              0x0
+CHECK-NEXT:   0x0000001E FLAGS                TEXTREL
+CHECK-NEXT:   0x6FFFFFFE VERNEED              0x4E4
+CHECK-NEXT:   0x6FFFFFFF VERNEEDNUM           3
+CHECK-NEXT:   0x6FFFFFF0 VERSYM               0x4C0
+CHECK-NEXT:   0x6FFFFFFA RELCOUNT             6
+CHECK-NEXT:   0x00000000 NULL                 0x0
+CHECK-NEXT: ]