[yaml2obj][obj2yaml] - Use a single "Other" field instead of "Other", "Visibility" and "StOther".

Currenly we can encode the 'st_other' field of symbol using 3 fields.
'Visibility' is used to encode STV_* values.
'Other' is used to encode everything except the visibility, but it can't handle arbitrary values.
'StOther' is used to encode arbitrary values when 'Visibility'/'Other' are not helpfull enough.

'st_other' field is used to encode symbol visibility and platform-dependent
flags and values. Problem to encode it is that it consists of Visibility part (STV_* values)
which are enumeration values and the Other part, which is different and inconsistent.

For MIPS the Other part contains flags for all STO_MIPS_* values except STO_MIPS_MIPS16.
(Like comment in ELFDumper says: "Someones in their infinite wisdom decided to make
STO_MIPS_MIPS16 flag overlapped with other ST_MIPS_xxx flags."...)

And for PPC64 the Other part might actually encode any value.

This patch implements custom logic for handling the st_other and removes
'Visibility' and 'StOther' fields.

Here is an example of a new YAML style this patch allows:

- Name:  foo
  Other: [ 0x4 ]
- Name:  bar
  Other: [ STV_PROTECTED, 4 ]
- Name:  zed
  Other: [ STV_PROTECTED, STO_MIPS_OPTIONAL, 0xf8 ]

Differential revision: https://reviews.llvm.org/D66886

llvm-svn: 370472

1 files changed, 3 insertions, 3 deletions

diff --git a/llvm/lib/Support/YAMLTraits.cpp b/llvm/lib/Support/YAMLTraits.cpp
index 7706fc3c1f2..eba22fd1472 100644
--- a/llvm/lib/Support/YAMLTraits.cpp
+++ b/llvm/lib/Support/YAMLTraits.cpp
@@ -40,7 +40,7 @@ IO::IO(void *Context) : Ctxt(Context) {}
 
 IO::~IO() = default;
 
-void *IO::getContext() {
+void *IO::getContext() const {
   return Ctxt;
 }
 
@@ -79,7 +79,7 @@ void Input::ScalarHNode::anchor() {}
 void Input::MapHNode::anchor() {}
 void Input::SequenceHNode::anchor() {}
 
-bool Input::outputting() {
+bool Input::outputting() const {
   return false;
 }
 
@@ -440,7 +440,7 @@ Output::Output(raw_ostream &yout, void *context, int WrapColumn)
 
 Output::~Output() = default;
 
-bool Output::outputting() {
+bool Output::outputting() const {
   return true;
 }