Georgii Rymar a7a447be0f [yaml2obj] - ProgramHeaders: introduce FirstSec/LastSec instead of Sections list.
Imagine we have a YAML declaration of few sections: `foo1`, `<unnamed 2>`, `foo3`, `foo4`.

To put them into segment we can do (1*):

```
Sections:
 - Section: foo1
 - Section: foo4
```

or we can use (2*):

```
Sections:
 - Section: foo1
 - Section: foo3
 - Section: foo4
```

or (3*) :

```
Sections:
 - Section: foo1
## "(index 2)" here is a name that we automatically created for a unnamed section.
 - Section: (index 2)
 - Section: foo3
 - Section: foo4
```

It looks really confusing that we don't have to list all of sections.

At first I've tried to make this rule stricter and report an error when there is a gap
(i.e. when a section is included into segment, but not listed explicitly).
This did not work perfect, because such approach conflicts with unnamed sections/fills (see (3*)).

This patch drops "Sections" key and introduces 2 keys instead: `FirstSec` and `LastSec`.
Both are optional.

Differential revision: https://reviews.llvm.org/D90458
2020-11-09 13:00:50 +03:00

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# Show that llvm-readobj can handle an empty .dynamic section.
# RUN: yaml2obj %s -o %t.o
# RUN: llvm-readobj --dynamic-table %t.o | FileCheck %s --check-prefix LLVM
# RUN: llvm-readelf --dynamic-table %t.o | FileCheck %s --check-prefix GNU --allow-empty
# LLVM: File: {{.*}}.o
# LLVM-NOT: DynamicSection
# GNU-NOT: {{.}}
!ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_EXEC
Sections:
- Name: .dynamic
Type: SHT_DYNAMIC
Address: 0x1000
ProgramHeaders:
- Type: PT_LOAD
VAddr: 0x1000
FirstSec: .dynamic
LastSec: .dynamic
- Type: PT_DYNAMIC
VAddr: 0x1000
FirstSec: .dynamic
LastSec: .dynamic