keep session alive

compile/common/package_json.lua

@@ -226,6 +226,11 @@ attributes.common = {
         markdownDescription = "Automatically stop after thread entry.",
         type = "boolean",
     },
+    keepSessionAlive = {
+        default = false,
+        markdownDescription = "Keep the debug session alive when the current debugged Lua VM is closed and later recreated in the same process.",
+        type = "boolean",
+    },
     address = {
         markdownDescription = [[
 Debugger address.

extension/script/backend/bootstrap.lua

@@ -2,6 +2,11 @@ local thread = require "bee.thread"
 local channel = require "bee.channel"
 
 local m = {}
+local keepSessionAlive = false
+
+function m.setKeepSessionAlive(enabled)
+    keepSessionAlive = not not enabled
+end
 
 local function hasMaster()
     return channel.query "DbgMaster" ~= nil
@@ -31,6 +36,9 @@ local function initMaster(rootpath, address)
         address
     ))
     ExitGuard = setmetatable({}, {__gc=function()
+        if keepSessionAlive then
+            return
+        end
         chan:push(nil, "EXIT")
         thread.wait(mt)
         channel.destroy("DbgMaster")

extension/script/backend/master/resolve_config.lua

@@ -22,6 +22,9 @@ local function resolve_config(config)
     if type(config.stopOnThreadEntry) ~= "boolean" then
         config.stopOnThreadEntry = false
     end
+    if type(config.keepSessionAlive) ~= "boolean" then
+        config.keepSessionAlive = false
+    end
     if type(config.luaVersion) ~= "string" then
         config.luaVersion = "lua54"
     end

extension/script/backend/worker.lua

@@ -13,6 +13,7 @@ local thread = require 'bee.thread'
 local fs = require 'backend.worker.filesystem'
 local log = require 'common.log'
 local channel = require "bee.channel"
+local bootstrap = require 'backend.bootstrap'
 
 local initialized = false
 local suspend = false
@@ -113,6 +114,7 @@ local function cleanFrame()
 end
 
 function CMD.initializing(pkg)
+    bootstrap.setKeepSessionAlive(pkg.config.keepSessionAlive)
     luaver.init()
     ev.emit('initializing', pkg.config)
 end