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|
local vm = require 'vm.vm'
local util = require 'utility'
local typeSort = {
['boolean'] = 1,
['string'] = 2,
['integer'] = 3,
['number'] = 4,
['table'] = 5,
['function'] = 6,
['nil'] = math.maxinteger,
}
NIL = setmetatable({'<nil>'}, { __tostring = function () return 'nil' end })
local function merge(t, b)
if not t then
t = {}
end
if not b then
return t
end
for i = 1, #b do
local o = b[i]
if not t[o] then
t[o] = true
t[#t+1] = o
end
end
return t
end
local function alloc(o)
-- TODO
assert(o.type)
if type(o.type) == 'table' then
local values = {}
for i = 1, #o.type do
local sub = {
type = o.type[i],
value = o.value,
source = o.source,
}
values[i] = sub
values[sub] = true
end
return values
else
return {
[1] = o,
[o] = true,
}
end
end
local function insert(t, o)
if not o then
return
end
if not t[o] then
t[o] = true
t[#t+1] = o
end
return t
end
local function checkLiteral(source)
if source.type == 'string' then
return alloc {
type = 'string',
value = source[1],
source = source,
}
elseif source.type == 'nil' then
return alloc {
type = 'nil',
value = NIL,
source = source,
}
elseif source.type == 'boolean' then
return alloc {
type = 'boolean',
value = source[1],
source = source,
}
elseif source.type == 'number' then
if math.type(source[1]) == 'integer' then
return alloc {
type = 'integer',
value = source[1],
source = source,
}
else
return alloc {
type = 'number',
value = source[1],
source = source,
}
end
elseif source.type == 'integer' then
return alloc {
type = 'integer',
source = source,
}
elseif source.type == 'table' then
return alloc {
type = 'table',
source = source,
}
elseif source.type == 'function' then
return alloc {
type = 'function',
source = source,
}
elseif source.type == '...' then
return alloc {
type = '...',
source = source,
}
end
end
local function checkUnary(source)
if source.type ~= 'unary' then
return
end
local op = source.op
if op.type == 'not' then
local checkTrue = vm.checkTrue(source[1])
local value = nil
if checkTrue == true then
value = false
elseif checkTrue == false then
value = true
end
return alloc {
type = 'boolean',
value = value,
source = source,
}
elseif op.type == '#' then
return alloc {
type = 'integer',
source = source,
}
elseif op.type == '~' then
local l = vm.getLiteral(source[1], 'integer')
return alloc {
type = 'integer',
value = l and ~l or nil,
source = source,
}
elseif op.type == '-' then
local v = vm.getLiteral(source[1], 'integer')
if v then
return alloc {
type = 'integer',
value = - v,
source = source,
}
end
v = vm.getLiteral(source[1], 'number')
return alloc {
type = 'number',
value = v and -v or nil,
source = source,
}
end
end
local function mathCheck(a, b)
local v1 = vm.getLiteral(a, 'integer') or vm.getLiteral(a, 'number')
local v2 = vm.getLiteral(b, 'integer') or vm.getLiteral(a, 'number')
local int = vm.hasType(a, 'integer')
and vm.hasType(b, 'integer')
and not vm.hasType(a, 'number')
and not vm.hasType(b, 'number')
return int and 'integer' or 'number', v1, v2
end
local function checkBinary(source)
if source.type ~= 'binary' then
return
end
local op = source.op
if op.type == 'and' then
local isTrue = vm.checkTrue(source[1])
if isTrue == true then
return vm.getValue(source[2])
elseif isTrue == false then
return vm.getValue(source[1])
else
return merge(
vm.getValue(source[1]),
vm.getValue(source[2])
)
end
elseif op.type == 'or' then
local isTrue = vm.checkTrue(source[1])
if isTrue == true then
return vm.getValue(source[1])
elseif isTrue == false then
return vm.getValue(source[2])
else
return merge(
vm.getValue(source[1]),
vm.getValue(source[2])
)
end
elseif op.type == '==' then
local value = vm.isSameValue(source[1], source[2])
if value ~= nil then
return alloc {
type = 'boolean',
value = value,
source = source,
}
end
local isSame = vm.isSameRef(source[1], source[2])
if isSame == true then
value = true
else
value = nil
end
return alloc {
type = 'boolean',
value = value,
source = source,
}
elseif op.type == '~=' then
local value = vm.isSameValue(source[1], source[2])
if value ~= nil then
return alloc {
type = 'boolean',
value = not value,
source = source,
}
end
local isSame = vm.isSameRef(source[1], source[2])
if isSame == true then
value = false
else
value = nil
end
return alloc {
type = 'boolean',
value = value,
source = source,
}
elseif op.type == '<=' then
local v1 = vm.getLiteral(source[1], 'integer') or vm.getLiteral(source[1], 'number')
local v2 = vm.getLiteral(source[2], 'integer') or vm.getLiteral(source[2], 'number')
local v
if v1 and v2 then
v = v1 <= v2
end
return alloc {
type = 'boolean',
value = v,
source = source,
}
elseif op.type == '>=' then
local v1 = vm.getLiteral(source[1], 'integer') or vm.getLiteral(source[1], 'number')
local v2 = vm.getLiteral(source[2], 'integer') or vm.getLiteral(source[2], 'number')
local v
if v1 and v2 then
v = v1 >= v2
end
return alloc {
type = 'boolean',
value = v,
source = source,
}
elseif op.type == '<' then
local v1 = vm.getLiteral(source[1], 'integer') or vm.getLiteral(source[1], 'number')
local v2 = vm.getLiteral(source[2], 'integer') or vm.getLiteral(source[2], 'number')
local v
if v1 and v2 then
v = v1 < v2
end
return alloc {
type = 'boolean',
value = v,
source = source,
}
elseif op.type == '>' then
local v1 = vm.getLiteral(source[1], 'integer') or vm.getLiteral(source[1], 'number')
local v2 = vm.getLiteral(source[2], 'integer') or vm.getLiteral(source[2], 'number')
local v
if v1 and v2 then
v = v1 > v2
end
return alloc {
type = 'boolean',
value = v,
source = source,
}
elseif op.type == '|' then
local v1 = vm.getLiteral(source[1], 'integer')
local v2 = vm.getLiteral(source[2], 'integer')
local v
if v1 and v2 then
v = v1 | v2
end
return alloc {
type = 'integer',
value = v,
source = source,
}
elseif op.type == '~' then
local v1 = vm.getLiteral(source[1], 'integer')
local v2 = vm.getLiteral(source[2], 'integer')
local v
if v1 and v2 then
v = v1 ~ v2
end
return alloc {
type = 'integer',
value = v,
source = source,
}
elseif op.type == '&' then
local v1 = vm.getLiteral(source[1], 'integer')
local v2 = vm.getLiteral(source[2], 'integer')
local v
if v1 and v2 then
v = v1 & v2
end
return alloc {
type = 'integer',
value = v,
source = source,
}
elseif op.type == '<<' then
local v1 = vm.getLiteral(source[1], 'integer')
local v2 = vm.getLiteral(source[2], 'integer')
local v
if v1 and v2 then
v = v1 << v2
end
return alloc {
type = 'integer',
value = v,
source = source,
}
elseif op.type == '>>' then
local v1 = vm.getLiteral(source[1], 'integer')
local v2 = vm.getLiteral(source[2], 'integer')
local v
if v1 and v2 then
v = v1 >> v2
end
return alloc {
type = 'integer',
value = v,
source = source,
}
elseif op.type == '..' then
local v1 = vm.getLiteral(source[1], 'string')
local v2 = vm.getLiteral(source[2], 'string')
local v
if v1 and v2 then
v = v1 .. v2
end
return alloc {
type = 'string',
value = v,
source = source,
}
elseif op.type == '^' then
local v1 = vm.getLiteral(source[1], 'integer') or vm.getLiteral(source[1], 'number')
local v2 = vm.getLiteral(source[2], 'integer') or vm.getLiteral(source[2], 'number')
local v
if v1 and v2 then
v = v1 ^ v2
end
return alloc {
type = 'number',
value = v,
source = source,
}
elseif op.type == '/' then
local v1 = vm.getLiteral(source[1], 'integer') or vm.getLiteral(source[1], 'number')
local v2 = vm.getLiteral(source[2], 'integer') or vm.getLiteral(source[2], 'number')
local v
if v1 and v2 then
v = v1 > v2
end
return alloc {
type = 'number',
value = v,
source = source,
}
-- 其他数学运算根据2侧的值决定,当2侧的值均为整数时返回整数
elseif op.type == '+' then
local int, v1, v2 = mathCheck(source[1], source[2])
return alloc {
type = int,
value = (v1 and v2) and (v1 + v2) or nil,
source = source,
}
elseif op.type == '-' then
local int, v1, v2 = mathCheck(source[1], source[2])
return alloc {
type = int,
value = (v1 and v2) and (v1 - v2) or nil,
source = source,
}
elseif op.type == '*' then
local int, v1, v2 = mathCheck(source[1], source[2])
return alloc {
type = int,
value = (v1 and v2) and (v1 * v2) or nil,
source = source,
}
elseif op.type == '%' then
local int, v1, v2 = mathCheck(source[1], source[2])
return alloc {
type = int,
value = (v1 and v2) and (v1 % v2) or nil,
source = source,
}
elseif op.type == '//' then
local int, v1, v2 = mathCheck(source[1], source[2])
return alloc {
type = int,
value = (v1 and v2) and (v1 // v2) or nil,
source = source,
}
end
end
local function checkValue(source)
if source.value then
return vm.getValue(source.value)
end
if source.type == 'paren' then
return vm.getValue(source.exp)
end
end
local function inferByCall(results, source)
if #results ~= 0 then
return
end
if not source.parent then
return
end
if source.parent.type ~= 'call' then
return
end
if source.parent.node == source then
insert(results, {
type = 'function',
source = source,
})
return
end
end
local function inferByGetTable(results, source)
if #results ~= 0 then
return
end
local next = source.next
if not next then
return
end
if next.type == 'getfield'
or next.type == 'getindex'
or next.type == 'getmethod'
or next.type == 'setfield'
or next.type == 'setindex'
or next.type == 'setmethod' then
insert(results, {
type = 'table',
source = source,
})
end
end
local function checkDef(results, source)
vm.eachDef(source, function (info)
local src = info.source
local tp = vm.getValue(src)
if tp then
merge(results, tp)
end
end)
end
local function checkLibraryTypes(source)
if type(source.type) ~= 'table' then
return nil
end
local results = {}
for i = 1, #source.type do
insert(results, {
type = source.type[i],
source = source,
})
end
return results
end
local function checkLibrary(source)
local lib = vm.getLibrary(source)
if not lib then
return nil
end
return alloc {
type = lib.type,
value = lib.value,
source = lib,
}
end
local function checkLibraryReturn(source)
if source.type ~= 'select' then
return nil
end
local index = source.index
local call = source.vararg
if call.type ~= 'call' then
return nil
end
local func = call.node
local lib = vm.getLibrary(func)
if not lib then
return nil
end
if lib.type ~= 'function' then
return nil
end
if not lib.returns then
return nil
end
local rtn = lib.returns[index]
if not rtn then
return nil
end
if not rtn.type then
return nil
end
if rtn.type == '...' then
return
end
return alloc {
type = rtn.type,
value = rtn.value,
source = rtn,
}
end
local function checkLibraryArg(source)
local args = source.parent
if not args then
return
end
if args.type ~= 'callargs' then
return
end
local call = args.parent
if not call then
return
end
local func = call.node
local index
for i = 1, #args do
if args[i] == source then
index = i
break
end
end
if not index then
return
end
local lib = vm.getLibrary(func)
local arg = lib and lib.args and lib.args[index]
if not arg then
return
end
if not arg.type then
return
end
if arg.type == '...' then
return
end
return alloc {
type = arg.type,
value = arg.value,
source = arg,
}
end
local function hasTypeInResults(results, type)
for i = 1, #results do
if results[i].type == 'type' then
return true
end
end
return false
end
local function inferByUnary(results, source)
if #results ~= 0 then
return
end
local parent = source.parent
if not parent or parent.type ~= 'unary' then
return
end
local op = parent.op
if op.type == '#' then
-- 会受顺序影响,不检查了
--if hasTypeInResults(results, 'string')
--or hasTypeInResults(results, 'integer') then
-- return
--end
insert(results, {
type = 'string',
source = source
})
insert(results, {
type = 'table',
source = source
})
elseif op.type == '~' then
insert(results, {
type = 'integer',
source = source
})
elseif op.type == '-' then
insert(results, {
type = 'number',
source = source
})
end
end
local function inferByBinary(results, source)
if #results ~= 0 then
return
end
local parent = source.parent
if not parent or parent.type ~= 'binary' then
return
end
local op = parent.op
if op.type == '<='
or op.type == '>='
or op.type == '<'
or op.type == '>'
or op.type == '^'
or op.type == '/'
or op.type == '+'
or op.type == '-'
or op.type == '*'
or op.type == '%' then
insert(results, {
type = 'number',
source = source
})
elseif op.type == '|'
or op.type == '~'
or op.type == '&'
or op.type == '<<'
or op.type == '>>'
-- 整数的可能性比较高
or op.type == '//' then
insert(results, {
type = 'integer',
source = source
})
elseif op.type == '..' then
insert(results, {
type = 'string',
source = source
})
end
end
local function inferBySetOfLocal(results, source)
if source.ref then
for i = 1, #source.ref do
local ref = source.ref[i]
if ref.type == 'setlocal' then
break
end
merge(results, vm.getValue(ref))
end
end
end
local function inferBySet(results, source)
if #results ~= 0 then
return
end
if source.type == 'local' then
inferBySetOfLocal(results, source)
elseif source.type == 'setlocal'
or source.type == 'getlocal' then
inferBySetOfLocal(results, source.node)
end
end
local function getValue(source)
local results = checkLiteral(source)
or checkValue(source)
or checkUnary(source)
or checkBinary(source)
or checkLibraryTypes(source)
or checkLibrary(source)
or checkLibraryReturn(source)
or checkLibraryArg(source)
if results then
return results
end
results = {}
checkDef(results, source)
inferBySet(results, source)
inferByCall(results, source)
inferByGetTable(results, source)
inferByUnary(results, source)
inferByBinary(results, source)
if #results == 0 then
return nil
end
return results
end
function vm.checkTrue(source)
local values = vm.getValue(source)
if not values then
return
end
-- 当前认为的结果
local current
for i = 1, #values do
-- 新的结果
local new
local v = values[i]
if v.type == 'nil' then
new = false
elseif v.type == 'boolean' then
if v.value == true then
new = true
elseif v.value == false then
new = false
end
end
if new ~= nil then
if current == nil then
current = new
else
-- 如果2个结果完全相反,则返回 nil 表示不确定
if new ~= current then
return nil
end
end
end
end
return current
end
--- 获取特定类型的字面量值
function vm.getLiteral(source, type)
local values = vm.getValue(source)
if not values then
return nil
end
for i = 1, #values do
local v = values[i]
if v.value ~= nil then
if type == nil or v.type == type then
return v.value
end
end
end
return nil
end
function vm.isSameValue(a, b)
local valuesA = vm.getValue(a)
local valuesB = vm.getValue(b)
if not valuesA or not valuesB then
return false
end
if valuesA == valuesB then
return true
end
local values = {}
for i = 1, #valuesA do
local value = valuesA[i]
local literal = value.value
if literal then
values[literal] = false
end
end
for i = 1, #valuesB do
local value = valuesA[i]
local literal = value.value
if literal then
if values[literal] == nil then
return false
end
values[literal] = true
end
end
for k, v in pairs(values) do
if v == false then
return false
end
end
return true
end
--- 是否包含某种类型
function vm.hasType(source, type)
local values = vm.getValue(source)
if not values then
return false
end
for i = 1, #values do
local value = values[i]
if value.type == type then
return true
end
end
return false
end
local function viewTypes(types)
if #types == 0 then
return 'any'
end
if #types == 1 then
return types[1]
end
table.sort(types, function (a, b)
local sa = typeSort[a]
local sb = typeSort[b]
if sa and sb then
return sa < sb
end
if not sa and not sb then
return a < b
end
if sa and not sb then
return true
end
if not sa and sb then
return false
end
return false
end)
return table.concat(types, '|')
end
function vm.viewType(values)
if not values then
return 'any'
end
if type(values) ~= 'table' then
return values or 'any'
end
local types = {}
for i = 1, #values do
local tp = values[i].type
if not types[tp] and tp ~= 'any' then
types[tp] = true
types[#types+1] = tp
end
end
return viewTypes(types)
end
function vm.mergeTypeViews(...)
local types = {}
for _, view in ipairs {...} do
for tp in view:gmatch '[^|]+' do
if not types[tp] and tp ~= 'any' then
types[tp] = true
types[#types+1] = tp
end
end
end
return viewTypes(types)
end
function vm.getType(source)
local values = vm.getValue(source)
return vm.viewType(values)
end
function vm.getValue(source)
if not source then
return
end
local cache = vm.cache.getValue[source]
if cache ~= nil then
return cache
end
local unlock = vm.lock('getValue', source)
if not unlock then
return
end
cache = getValue(source) or false
vm.cache.getValue[source] = cache
unlock()
return cache
end
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