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Add versioned, ABI-tagged inline namespace and namespace macros (#3590)

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* Add versioned inline namespace

Add a versioned inline namespace to prevent ABI issues when linking code
using multiple library versions.

* Add namespace macros

* Encode ABI information in inline namespace

Add _diag suffix to inline namespace if JSON_DIAGNOSTICS is enabled, and
_ldvcmp suffix if JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON is enabled.

* Move ABI-affecting macros into abi_macros.hpp

* Move std_fs namespace definition into std_fs.hpp

* Remove std_fs namespace from unit test

* Format more files in tests directory

* Add unit tests

* Update documentation

* Fix GDB pretty printer

* fixup! Add namespace macros

* Derive ABI prefix from NLOHMANN_JSON_VERSION_*
This commit is contained in:
Florian Albrechtskirchinger
2022-07-30 21:59:13 +02:00
committed by GitHub
parent fca1ddda96
commit d909f80960
72 changed files with 23116 additions and 561 deletions
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3
tools/gdb_pretty_printer/README.md
View File

@@ -50,7 +50,8 @@ File [nlohmann-json.py](nlohmann-json.py) contains a pretty printer for GDB for
}
```
Tested with GDB 9.2. See [#1952](https://github.com/nlohmann/json/issues/1952) for more information. Please post questions there.
Requires Python 3.9+. Last tested with GDB 12.1.
See [#1952](https://github.com/nlohmann/json/issues/1952) for more information. Please post questions there.
## Copyright

14
tools/gdb_pretty_printer/nlohmann-json.py
View File

@@ -1,5 +1,7 @@
import gdb
import re
ns_pattern = re.compile(r'nlohmann::json_v(?P<v_major>\d+)_(?P<v_minor>\d+)_(?P<v_patch>\d+)(?P<tags>\w*)::(?P<name>.+)')
class JsonValuePrinter:
"Print a json-value"
@@ -12,12 +14,14 @@ class JsonValuePrinter:
return self.val
def json_lookup_function(val):
name = val.type.strip_typedefs().name
if name and name.startswith("nlohmann::basic_json<") and name.endswith(">"):
t = str(val['m_type'])
if t.startswith("nlohmann::detail::value_t::"):
m = ns_pattern.fullmatch(val.type.strip_typedefs().name)
name = m.group('name')
if name and name.startswith('basic_json<') and name.endswith('>'):
m = ns_pattern.fullmatch(str(val['m_type']))
t = m.group('name')
if t and t.startswith('detail::value_t::'):
try:
union_val = val['m_value'][t[27:]]
union_val = val['m_value'][t.removeprefix('detail::value_t::')]
if union_val.type.code == gdb.TYPE_CODE_PTR:
return gdb.default_visualizer(union_val.dereference())
else: