[obj2yaml] - Teach tool to dump SHT_NULL sections.

Recently an advanced support of SHT_NULL sections
was implemented in yaml2obj.

This patch adds a corresponding support to obj2yaml.

Differential revision: https://reviews.llvm.org/D65215

llvm-svn: 367852

1 files changed, 143 insertions, 0 deletions

diff --git a/llvm/test/tools/obj2yaml/elf-null-section.yaml b/llvm/test/tools/obj2yaml/elf-null-section.yaml
new file mode 100644
index 00000000000..99781ec1067
--- /dev/null
+++ b/llvm/test/tools/obj2yaml/elf-null-section.yaml
@@ -0,0 +1,143 @@
+## Check we are able to dump the SHT_NULL section at
+## index 0 when it has custom section fields.
+
+# RUN: yaml2obj --docnum=1 %s -o %t1
+# RUN: obj2yaml %t1 | FileCheck %s --check-prefix=FIRST-SEC
+
+# FIRST-SEC:      --- !ELF
+# FIRST-SEC-NEXT: FileHeader:
+# FIRST-SEC-NEXT:   Class:   ELFCLASS64
+# FIRST-SEC-NEXT:   Data:    ELFDATA2LSB
+# FIRST-SEC-NEXT:   Type:    ET_REL
+# FIRST-SEC-NEXT:   Machine: EM_X86_64
+# FIRST-SEC-NEXT: Sections:
+# FIRST-SEC-NEXT:   - Type:         SHT_NULL
+# FIRST-SEC-NEXT:     Flags:        [ SHF_ALLOC ]
+# FIRST-SEC-NEXT:     Address:      0x0000000000000006
+# FIRST-SEC-NEXT:     Link:         .foo
+# FIRST-SEC-NEXT:     AddressAlign: 0x0000000000000003
+# FIRST-SEC-NEXT:     EntSize:      0x0000000000000005
+# FIRST-SEC-NEXT:     Size:         0x0000000000000004
+# FIRST-SEC-NEXT:     Info:         0x0000000000000002
+# FIRST-SEC-NEXT:   - Name:         .foo
+# FIRST-SEC-NEXT:     Type:         SHT_PROGBITS
+# FIRST-SEC-NEXT: ...
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_REL
+  Machine: EM_X86_64
+Sections:
+  - Type:         SHT_NULL
+    Name:         ''
+    Flags:        [ SHF_ALLOC ]
+    Link:         1
+    Info:         2
+    AddressAlign: 0x3
+    Size:         0x4
+    EntSize:      0x5
+    Address:      0x6
+  - Type: SHT_PROGBITS
+    Name: .foo
+
+## Check we are able to dump the SHT_NULL section with a non-zero index.
+
+# RUN: yaml2obj --docnum=2 %s -o %t2
+# RUN: obj2yaml %t2 | FileCheck %s --check-prefix=SECOND-SEC
+
+# SECOND-SEC:      --- !ELF
+# SECOND-SEC-NEXT: FileHeader:
+# SECOND-SEC-NEXT:   Class:   ELFCLASS64
+# SECOND-SEC-NEXT:   Data:    ELFDATA2LSB
+# SECOND-SEC-NEXT:   Type:    ET_REL
+# SECOND-SEC-NEXT:   Machine: EM_X86_64
+# SECOND-SEC-NEXT: Sections:
+# SECOND-SEC-NEXT:   - Name:         .foo
+# SECOND-SEC-NEXT:     Type:         SHT_PROGBITS
+# SECOND-SEC-NEXT:   - Type:         SHT_NULL
+# SECOND-SEC-NEXT:     Flags:        [ SHF_ALLOC ]
+# SECOND-SEC-NEXT:     Address:      0x0000000000000006
+# SECOND-SEC-NEXT:     Link:         .foo
+# SECOND-SEC-NEXT:     AddressAlign: 0x0000000000000003
+# SECOND-SEC-NEXT:     EntSize:      0x0000000000000005
+# SECOND-SEC-NEXT:     Content:      '00000000'
+# SECOND-SEC-NEXT:     Info:         0x0000000000000002
+# SECOND-SEC-NEXT: ...
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_REL
+  Machine: EM_X86_64
+Sections:
+  - Type: SHT_PROGBITS
+    Name: .foo
+  - Type:         SHT_NULL
+    Name:         ''
+    Flags:        [ SHF_ALLOC ]
+    Link:         1
+    Info:         2
+    AddressAlign: 0x3
+    Size:         0x4
+    EntSize:      0x5
+    Address:      0x6
+
+## Check we do not dump the SHT_NULL section with index 0
+## when it does not have any custom fields.
+
+# RUN: yaml2obj --docnum=3 %s -o %t3
+# RUN: obj2yaml %t3 | FileCheck %s --check-prefix=NULL-SEC
+
+# NULL-SEC:      --- !ELF
+# NULL-SEC-NEXT: FileHeader:
+# NULL-SEC-NEXT:   Class:   ELFCLASS64
+# NULL-SEC-NEXT:   Data:    ELFDATA2LSB
+# NULL-SEC-NEXT:   Type:    ET_REL
+# NULL-SEC-NEXT:   Machine: EM_X86_64
+# NULL-SEC-NEXT: Sections:
+# NULL-SEC-NEXT:   - Name: .foo
+# NULL-SEC-NEXT:     Type: SHT_PROGBITS
+# NULL-SEC-NEXT: ...
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_REL
+  Machine: EM_X86_64
+Sections:
+  - Type: SHT_NULL
+  - Type: SHT_PROGBITS
+    Name: .foo
+
+## Check we dump SHT_NULL sections which are not at the beginning
+## of the section list even if they don't have any non-null fields.
+
+# RUN: yaml2obj --docnum=4 %s -o %t4
+# RUN: obj2yaml %t4 | FileCheck %s --check-prefix=NULL-SEC-MIDDLE
+
+# NULL-SEC-MIDDLE:      --- !ELF
+# NULL-SEC-MIDDLE-NEXT: FileHeader:
+# NULL-SEC-MIDDLE-NEXT:   Class:   ELFCLASS64
+# NULL-SEC-MIDDLE-NEXT:   Data:    ELFDATA2LSB
+# NULL-SEC-MIDDLE-NEXT:   Type:    ET_REL
+# NULL-SEC-MIDDLE-NEXT:   Machine: EM_X86_64
+# NULL-SEC-MIDDLE-NEXT: Sections:
+# NULL-SEC-MIDDLE-NEXT:   - Name: .foo
+# NULL-SEC-MIDDLE-NEXT:     Type: SHT_PROGBITS
+# NULL-SEC-MIDDLE-NEXT:   - Type: SHT_NULL
+# NULL-SEC-MIDDLE-NEXT: ...
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_REL
+  Machine: EM_X86_64
+Sections:
+  - Type: SHT_PROGBITS
+    Name: .foo
+  - Type: SHT_NULL