continuation of
[#142684](https://github.com/llvm/llvm-project/pull/142684) to show
plugin names.

From issue [#14258](https://github.com/llvm/llvm-project/issues/142581)

This PR adds an MCP (Model Context Protocol ) server to LLDB. For
motivation and background, please refer to the corresponding RFC:
https://discourse.llvm.org/t/rfc-adding-mcp-support-to-lldb/86798

I implemented this as a new kind of plugin. The idea is that we could
support multiple protocol servers (e.g. if we want to support DAP from
within LLDB). This also introduces a corresponding top-level command
(`protocol-server`) with two subcommands to `start` and `stop` the
server.

```
(lldb) protocol-server start MCP tcp://localhost:1234
MCP server started with connection listeners: connection://[::1]:1234, connection://[127.0.0.1]:1234
```

The MCP sever supports one tool (`lldb_command`) which executes a
command, but can easily be extended with more commands.

In #134418 we added support to list/enable/disable `SystemRuntime` and
`InstrumentationRuntime` plugins. We limited it to those two plugin
types to flesh out the idea with a smaller change.

This PR adds support for the remaining plugin types. We now support all
the plugins that can be registered directly with the plugin manager.
Plugins that are added by loading shared objects are still not
supported.

This commit adds three new commands for managing plugins. The `list`
command will show which plugins are currently registered and their
enabled state. The `enable` and `disable` commands can be used to enable
or disable plugins.

A disabled plugin will not show up to the PluginManager when it iterates
over available plugins of a particular type.

The purpose of these commands is to provide more visibility into
registered plugins and allow users to disable plugins for experimental
perf reasons.

There are a few limitations to the current implementation

1. Only SystemRuntime and InstrumentationRuntime plugins are currently
supported. We can easily extend the existing implementation to support
more types. The scope was limited to these plugins to keep the PR size
manageable.

2. Only "statically" know plugin types are supported (i.e. those managed
by the PluginManager and not from `plugin load`). It is possibly we
could support dynamic plugins as well, but I have not looked into it
yet.

Identical PR to: https://github.com/llvm/llvm-project/pull/134563
Previous PR was approved and landed but broke the build due to bad
merge.
Manually resolve the merge conflict and try to land again.

Co-authored-by: George Hu <georgehuyubo@gmail.com>

This reverts commit 070a4ae2f9bcf6967a7147ed2972f409eaa7d3a6.

Multiple buildbot failures have been reported:
https://github.com/llvm/llvm-project/pull/134563

The build fails with:

  lldb/source/Target/Statistics.cpp:75:39: error: use of undeclared
  identifier 'num_symbols_loaded'

In statistics, add locate time for each module in statistics, we time
the PluginManager::LocateExecutableSymbolFile and
PluginManager::LocateExecutableObjectFile call, save the duration for
the succeeded symbol locator plugin in the Module class as a map.
New key being added:
Module level: "_symbolLocatorTime_"
Summary level: "_totalSymbolLocatorTime_"
which would be a map of symbol_locator_plugin_name to time.

Sample statistic dump output after this change:

```
Command: statistics dump
===============Output===============
{
  "commands": {
    "command container add": 1,
    "command script add": 51,
    "command script import": 59,
    "statistics dump": 1,
    "target create": 1,
    "type summary add": 36,
    "type synthetic add": 21
  },
  "memory": {
    "strings": {
      "bytesTotal": 2801664,
      "bytesUnused": 1704256,
      "bytesUsed": 1097408
    }
  },
  "modules": [
    {
      "debugInfoByteSize": 244927,
      "debugInfoEnabled": true,
      "debugInfoHadIncompleteTypes": false,
      "debugInfoHadVariableErrors": false,
      "debugInfoIndexLoadedFromCache": false,
      "debugInfoIndexSavedToCache": false,
      "debugInfoIndexTime": 0.61934599999999995,
      "debugInfoParseTime": 0.00033100000000000002,
      "identifier": 94868115726768,
      "path": "/home/hyubo/.cache/llvm-debuginfod/client/llvmcache-720c9a0f5ba8b460a1524a25597226f0fa551f71-c4crasher",
      "symbolLocatorTime": {
        "debuginfod": 1.4547020000000002
      },
      "symbolTableIndexTime": 0.0035370000000000002,
      "symbolTableLoadedFromCache": false,
      "symbolTableParseTime": 0.0055040000000000002,
      "symbolTableSavedToCache": false,
      "symbolTableStripped": false,
      "triple": "x86_64--linux",
      "uuid": "720C9A0F-5BA8-B460-A152-4A25597226F0-FA551F71"
    },
    {
      "debugInfoByteSize": 0,
      "debugInfoEnabled": false,
      "debugInfoHadIncompleteTypes": false,
      "debugInfoHadVariableErrors": false,
      "debugInfoIndexLoadedFromCache": false,
      "debugInfoIndexSavedToCache": false,
      "debugInfoIndexTime": 0,
      "debugInfoParseTime": 0,
      "identifier": 94868111142256,
      "path": "[vdso](0x00007ffd41c59000)",
      "symbolLocatorTime": {
        "debuginfod": 0.80597700000000005
      },
      "symbolTableIndexTime": 2.8e-05,
      "symbolTableLoadedFromCache": false,
      "symbolTableParseTime": 0.00037300000000000001,
      "symbolTableSavedToCache": false,
      "symbolTableStripped": false,
      "triple": "x86_64--linux",
      "uuid": "4D1F38BD-BD34-DFB3-C9A5-B49A2A912219-AC713763"
    },
    {
      "debugInfoByteSize": 0,
      "debugInfoEnabled": false,
      "debugInfoHadIncompleteTypes": false,
      "debugInfoHadVariableErrors": false,
      "debugInfoIndexLoadedFromCache": false,
      "debugInfoIndexSavedToCache": false,
      "debugInfoIndexTime": 0,
      "debugInfoParseTime": 0,
      "identifier": 94868116162096,
      "path": "/usr/local/fbcode/platform010/lib/libc.so.6",
      "symbolLocatorTime": {
        "debuginfod": 0.286356
      },
      "symbolTableIndexTime": 0.0091780000000000004,
      "symbolTableLoadedFromCache": false,
      "symbolTableParseTime": 0.081841999999999998,
      "symbolTableSavedToCache": false,
      "symbolTableStripped": false,
      "triple": "x86_64--linux",
      "uuid": "ACE9DF01-8872-3A35-6D14-3C92527EF739-4BE32C75"
    },
    {
      "debugInfoByteSize": 0,
      "debugInfoEnabled": false,
      "debugInfoHadIncompleteTypes": false,
      "debugInfoHadVariableErrors": false,
      "debugInfoIndexLoadedFromCache": false,
      "debugInfoIndexSavedToCache": false,
      "debugInfoIndexTime": 0,
      "debugInfoParseTime": 0,
      "identifier": 94868111990032,
      "path": "/usr/local/fbcode/platform010/lib/libm.so.6",
      "symbolLocatorTime": {
        "debuginfod": 0.63356699999999999
      },
      "symbolTableIndexTime": 0.0023960000000000001,
      "symbolTableLoadedFromCache": false,
      "symbolTableParseTime": 0.021706,
      "symbolTableSavedToCache": false,
      "symbolTableStripped": false,
      "triple": "x86_64--linux",
      "uuid": "85932B54-0DE7-4FC1-23B0-FB09AD1A5A61-8E1098B7"
    },
    {
      "debugInfoByteSize": 0,
      "debugInfoEnabled": false,
      "debugInfoHadIncompleteTypes": false,
      "debugInfoHadVariableErrors": false,
      "debugInfoIndexLoadedFromCache": false,
      "debugInfoIndexSavedToCache": false,
      "debugInfoIndexTime": 0,
      "debugInfoParseTime": 0,
      "identifier": 94868116399488,
      "path": "/usr/local/fbcode/platform010/lib/libmvec.so.1",
      "symbolLocatorTime": {
        "debuginfod": 0.66705099999999995
      },
      "symbolTableIndexTime": 0.00053700000000000004,
      "symbolTableLoadedFromCache": false,
      "symbolTableParseTime": 0.0034429999999999999,
      "symbolTableSavedToCache": false,
      "symbolTableStripped": false,
      "triple": "x86_64--linux",
      "uuid": "4537CA22-8E6E-495B-7A03-FC2CEDCAD71C-8A7B2067"
    },
    {
      "debugInfoByteSize": 0,
      "debugInfoEnabled": false,
      "debugInfoHadIncompleteTypes": false,
      "debugInfoHadVariableErrors": false,
      "debugInfoIndexLoadedFromCache": false,
      "debugInfoIndexSavedToCache": false,
      "debugInfoIndexTime": 0,
      "debugInfoParseTime": 0,
      "identifier": 94868111778368,
      "path": "/usr/local/fbcode/platform010/lib/libatomic.so.1",
      "symbolLocatorTime": {
        "debuginfod": 0.83268299999999995
      },
      "symbolTableIndexTime": 0.000243,
      "symbolTableLoadedFromCache": false,
      "symbolTableParseTime": 0.0026640000000000001,
      "symbolTableSavedToCache": false,
      "symbolTableStripped": false,
      "triple": "x86_64--",
      "uuid": "F90F9111-BBD1-C2A9-972A-34EB75ABE62E-3BDED9CF"
    },
    {
      "debugInfoByteSize": 0,
      "debugInfoEnabled": false,
      "debugInfoHadIncompleteTypes": false,
      "debugInfoHadVariableErrors": false,
      "debugInfoIndexLoadedFromCache": false,
      "debugInfoIndexSavedToCache": false,
      "debugInfoIndexTime": 0,
      "debugInfoParseTime": 0,
      "identifier": 94868116403264,
      "path": "/usr/local/fbcode/platform010/lib/libgcc_s.so.1",
      "symbolLocatorTime": {
        "debuginfod": 0.58871499999999999
      },
      "symbolTableIndexTime": 0.000292,
      "symbolTableLoadedFromCache": false,
      "symbolTableParseTime": 0.0033,
      "symbolTableSavedToCache": false,
      "symbolTableStripped": false,
      "triple": "x86_64--",
      "uuid": "1C715A92-40BE-BE95-E148-1B401749BAB8-15D09F9D"
    },
    {
      "debugInfoByteSize": 0,
      "debugInfoEnabled": false,
      "debugInfoHadIncompleteTypes": false,
      "debugInfoHadVariableErrors": false,
      "debugInfoIndexLoadedFromCache": false,
      "debugInfoIndexSavedToCache": false,
      "debugInfoIndexTime": 0,
      "debugInfoParseTime": 0,
      "identifier": 94868113225328,
      "path": "/usr/local/fbcode/platform010/lib/libstdc++.so.6",
      "symbolLocatorTime": {
        "debuginfod": 0.76993400000000001
      },
      "symbolTableIndexTime": 0.042455,
      "symbolTableLoadedFromCache": false,
      "symbolTableParseTime": 0.081374000000000002,
      "symbolTableSavedToCache": false,
      "symbolTableStripped": false,
      "triple": "x86_64--",
      "uuid": "C9DAEE53-F607-981B-6BED-F2042833BFC7-71A1E66C"
    },
    {
      "debugInfoByteSize": 0,
      "debugInfoEnabled": false,
      "debugInfoHadIncompleteTypes": false,
      "debugInfoHadVariableErrors": false,
      "debugInfoIndexLoadedFromCache": false,
      "debugInfoIndexSavedToCache": false,
      "debugInfoIndexTime": 0,
      "debugInfoParseTime": 0,
      "identifier": 94868113600960,
      "path": "/usr/local/fbcode/platform010/lib/ld.so",
      "symbolLocatorTime": {
        "debuginfod": 0.48382199999999997
      },
      "symbolTableIndexTime": 0.00054799999999999998,
      "symbolTableLoadedFromCache": false,
      "symbolTableParseTime": 0.0057219999999999997,
      "symbolTableSavedToCache": false,
      "symbolTableStripped": false,
      "triple": "x86_64--linux",
      "uuid": "CCA86CF4-E4FF-42C8-7056-2F7D8B83AEE0-530B4095"
    }
  ],
  "targets": [
    {
      "breakpoints": [],
      "dyldPluginName": "dump-modulelist-dyld",
      "expressionEvaluation": {
        "failures": 0,
        "successes": 0
      },
      "frameVariable": {
        "failures": 0,
        "successes": 0
      },
      "mismatchCoredumpModuleCount": 0,
      "moduleIdentifiers": [
        94868115726768,
        94868111142256,
        94868116162096,
        94868111990032,
        94868116399488,
        94868111778368,
        94868116403264,
        94868113225328,
        94868113600960
      ],
      "signals": [
        {
          "SIGABRT": 1
        }
      ],
      "sourceMapDeduceCount": 0,
      "sourceRealpathAttemptCount": 0,
      "sourceRealpathCompatibleCount": 0,
      "stopCount": 1,
      "summaryProviderStatistics": [],
      "targetCreateTime": 4.1999999999999998e-05,
      "totalBreakpointResolveTime": 0,
      "totalSharedLibraryEventHitCount": 0
    }
  ],
  "totalDebugInfoByteSize": 244927,
  "totalDebugInfoEnabled": 1,
  "totalDebugInfoIndexLoadedFromCache": 0,
  "totalDebugInfoIndexSavedToCache": 0,
  "totalDebugInfoIndexTime": 0.61934599999999995,
  "totalDebugInfoParseTime": 0.00033100000000000002,
  "totalModuleCount": 9,
  "totalModuleCountHasDebugInfo": 1,
  "totalModuleCountWithIncompleteTypes": 0,
  "totalModuleCountWithVariableErrors": 0,
  "totalSymbolLocatorTime": {
    "debuginfod": 6.5228070000000002
  },
  "totalSymbolTableIndexTime": 0.059214000000000003,
  "totalSymbolTableParseTime": 0.205928,
  "totalSymbolTableStripped": 0,
  "totalSymbolTablesLoadedFromCache": 0,
  "totalSymbolTablesSavedToCache": 0,
  "transcript": [
    {
      "command": "symsrv",
      "commandArguments": "",
      "commandName": "symsrv",
      "durationInSeconds": 0.00069099999999999999,
      "error": "",
      "output": "",
      "timestampInEpochSeconds": 1744934015
    },
    {
      "command": "settings set symbols.enable-external-lookup true",
      "commandArguments": "symbols.enable-external-lookup true",
      "commandName": "settings set",
      "durationInSeconds": 4.1999999999999998e-05,
      "error": "",
      "output": "",
      "timestampInEpochSeconds": 1744934015
    },
    {
      "command": "settings insert-before plugin.symbol-locator.debuginfod.server-urls 0 https://our.intern.facebook.com/intern/debuginfod",
      "commandArguments": "plugin.symbol-locator.debuginfod.server-urls 0 https://our.intern.facebook.com/intern/debuginfod",
      "commandName": "settings insert-before",
      "durationInSeconds": 5.5999999999999999e-05,
      "error": "",
      "output": "",
      "timestampInEpochSeconds": 1744934015
    },
    {
      "command": "target create --core \"/var/tmp/cores/c4crasher.crasher.1576894\"",
      "commandArguments": "--core \"/var/tmp/cores/c4crasher.crasher.1576894\"",
      "commandName": "target create",
      "durationInSeconds": 6.7297630000000002,
      "error": "",
      "output": "Core file '/var/tmp/cores/c4crasher.crasher.1576894' (x86_64) was loaded.\n",
      "timestampInEpochSeconds": 1744934017
    },
    {
      "command": "fbpaste statistics dump",
      "commandArguments": "statistics dump",
      "commandName": "fbpaste",
      "timestampInEpochSeconds": 1744934055
    },
    {
      "command": "statistics dump",
      "commandArguments": "",
      "commandName": "statistics dump",
      "timestampInEpochSeconds": 1744934055
    }
  ]
}

```

Co-authored-by: George Hu <georgehuyubo@gmail.com>

Adds the new `plugin.cplusplus.display.function-name-format` setting and makes the `${function.name-with-args}` query it for formatting the function name.

One caveat is that the setting can't itself be set to `${function.name-with-args}` because that would cause infinite recursion and blow the stack. I added an XFAILed test-case for it and will address it in a follow-up patch.

https://github.com/llvm/llvm-project/pull/131836

This commit adds support for enabling and disabling plugins by name. The
changes are made generically in the `PluginInstances` class, but
currently we only expose the ability to SystemRuntime plugins. Other
plugins types can be added easily.

We had a few design goals for how disabled plugins should work

1. Plugins that are disabled should still be visible to the system. This
allows us to dynamically enable and disable plugins and report their
state to the user.
2. Plugin order should be stable across disable and enable changes. We
want avoid changing the order of plugin lookup. When a plugin is
re-enabled it should return to its original slot in the creation order.
3. Disabled plugins should not appear in PluginManager operations.
Clients should be able to assume that only enabled plugins will be
returned from the PluginManager.

For the implementation we modify the plugin instance to maintain a bool
of its enabled state. Existing clients external to the Instances class
expect to iterate over only enabled instance so we skip over disabed
instances in the query and snapshot apis. This way the client does not
have to manually check which instances are enabled.