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Fixes to error handling in boot.lua 

- The pcalls to run conf were triggering their error very late, and were detecting error based on the second return value of pcall being non-nil. In fact the second return value of pcall is often non-nil in the case of *success*. We should check the first parameter, success/failure, instead.

- It is possible in principle to call error() with a non-string value, so errhand should sanitize its values with tostring.

- There is a check in the main boot.lua loop whether xpcall returned a string, which is the sign luajit hit an error in an error handler. This check was occurring in the wrong place (my fault; merge error when preparing PR) so if lovr.load() hit this case we were falling back to the horrible “could not call a string” error.
This commit is contained in:
mcc 2018-11-23 02:44:56 -05:00 committed by Bjorn Swenson
parent 0e99d47394
commit 8e8091ccbc
2 changed files with 416 additions and 409 deletions
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19
src/resources/boot.lua
View File

@ -81,9 +81,9 @@ function lovr.boot()
local hasConf, hasMain = lovr.filesystem.isFile('conf.lua'), lovr.filesystem.isFile('main.lua')
if not lovr.filesystem.getSource() or not (hasConf or hasMain) then nogame() end
local ok, confError
if hasConf then ok, confError = pcall(require, 'conf') end
if lovr.conf then ok, confError = pcall(lovr.conf, conf) end
local confOk, confError = true
if hasConf then confOk, confError = pcall(require, 'conf') end
if confOk and lovr.conf then confOk, confError = pcall(lovr.conf, conf) end
lovr._setConf(conf)
lovr.filesystem.setIdentity(conf.identity)
@ -100,7 +100,7 @@ function lovr.boot()
end
lovr.handlers = setmetatable({}, { __index = lovr })
if confError then error(confError) end
if not confOk then error(confError) end
if hasMain then require 'main' end
return lovr.run()
end
@ -149,6 +149,7 @@ local function formatTraceback(s)
end
function lovr.errhand(message, traceback)
message = tostring(message)
message = 'Error:\n' .. message .. formatTraceback(traceback or debug.traceback('', 2))
print(message)
if not lovr.graphics then return function() return 1 end end
@ -202,7 +203,7 @@ return function()
return lovr.errhand(e, tb) or abortclean
else
print('Error occurred while trying to display another error:\n' ..
e .. formatTraceback(tb or debug.traceback('', 2)))
tostring(e) .. formatTraceback(tb or debug.traceback('', 2)))
return abortclean
end
end
@ -212,15 +213,15 @@ return function()
local _, continuation = xpcall(lovr.boot, onerror)
while true do
local ok, result = xpcall(continuation, onerror)
if result and ok then return result -- Result is value returned by function. Return it.
elseif not ok then continuation = result end -- Result is value returned by error handler. Make it the new error handler.
if type(continuation) == 'string' then -- LuaJIT returns a fixed string if an error occurs in an xpcall error handler
print('Error occurred while trying to display another error.')
return 1
end
local ok, result = xpcall(continuation, onerror)
if result and ok then return result -- Result is value returned by function. Return it.
elseif not ok then continuation = result end -- Result is value returned by error handler. Make it the new error handler.
local externerror = coroutine.yield() -- Return control to C code
if externerror then -- A must-report error occurred in the C code

806
src/resources/boot.lua.h
View File

@ -205,414 +205,420 @@ unsigned char boot_lua[] = {
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unsigned int boot_lua_len = 7380;
unsigned int boot_lua_len = 7451;