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|
---@class vm
local vm = require 'vm.vm'
local guide = require 'parser.guide'
local util = require 'utility'
---@class parser.object
---@field package _tracer? vm.tracer
---@field package _casts? parser.object[]
---@alias tracer.mode 'local' | 'global'
---@class vm.tracer
---@field mode tracer.mode
---@field name string
---@field source parser.object | vm.variable
---@field assigns (parser.object | vm.variable)[]
---@field assignMap table<parser.object, true>
---@field getMap table<parser.object, true>
---@field careMap table<parser.object, true>
---@field mark table<parser.object, true>
---@field casts parser.object[]
---@field nodes table<parser.object, vm.node|false>
---@field main parser.object
---@field uri uri
---@field castIndex integer?
local mt = {}
mt.__index = mt
mt.fastCalc = true
---@return parser.object[]
function mt:getCasts()
local root = guide.getRoot(self.main)
if not root._casts then
root._casts = {}
local docs = root.docs
for _, doc in ipairs(docs) do
if doc.type == 'doc.cast' and doc.name then
root._casts[#root._casts+1] = doc
end
end
end
return root._casts
end
---@param obj parser.object
function mt:collectAssign(obj)
while true do
local block = guide.getParentBlock(obj)
if not block then
return
end
obj = block
if self.assignMap[obj] then
return
end
if obj == self.main then
return
end
self.assignMap[obj] = true
self.assigns[#self.assigns+1] = obj
end
end
---@param obj parser.object
function mt:collectCare(obj)
while true do
if self.careMap[obj] then
return
end
if obj == self.main then
return
end
if not obj then
return
end
self.careMap[obj] = true
if self.fastCalc then
if obj.type == 'if'
or obj.type == 'while'
or obj.type == 'binary' then
self.fastCalc = false
end
if obj.type == 'call' and obj.node then
if obj.node.special == 'assert'
or obj.node.special == 'type' then
self.fastCalc = false
end
end
end
obj = obj.parent
end
end
function mt:collectLocal()
local startPos = self.source.base.start
local finishPos = 0
local variable = self.source
if variable.base.type ~= 'local'
and variable.base.type ~= 'self' then
self.assigns[#self.assigns+1] = variable
self.assignMap[self.source] = true
end
for _, set in ipairs(variable.sets) do
self.assigns[#self.assigns+1] = set
self.assignMap[set] = true
self:collectCare(set)
if set.finish > finishPos then
finishPos = set.finish
end
end
for _, get in ipairs(variable.gets) do
self:collectCare(get)
self.getMap[get] = true
if get.finish > finishPos then
finishPos = get.finish
end
end
local casts = self:getCasts()
for _, cast in ipairs(casts) do
if cast.name[1] == self.name
and cast.start > startPos
and cast.finish < finishPos
and vm.getCastTargetHead(cast) == variable.base then
self.casts[#self.casts+1] = cast
end
end
if #self.casts > 0 then
self.fastCalc = false
end
end
function mt:collectGlobal()
self.assigns[#self.assigns+1] = self.source
self.assignMap[self.source] = true
local uri = guide.getUri(self.source)
local global = self.source.global
local link = global.links[uri]
for _, set in ipairs(link.sets) do
self.assigns[#self.assigns+1] = set
self.assignMap[set] = true
self:collectCare(set)
end
for _, get in ipairs(link.gets) do
self:collectCare(get)
self.getMap[get] = true
end
local casts = self:getCasts()
for _, cast in ipairs(casts) do
if cast.name[1] == self.name then
local castTarget = vm.getCastTargetHead(cast)
if castTarget and castTarget.type == 'global' then
self.casts[#self.casts+1] = cast
end
end
end
if #self.casts > 0 then
self.fastCalc = false
end
end
---@param start integer
---@param finish integer
---@return parser.object?
function mt:getLastAssign(start, finish)
local lastAssign
for _, assign in ipairs(self.assigns) do
local obj
if assign.type == 'variable' then
---@cast assign vm.variable
obj = assign.base
else
---@cast assign parser.object
obj = assign
end
if obj.start < start then
goto CONTINUE
end
if (obj.effect or obj.range or obj.start) >= finish then
break
end
local objBlock = guide.getTopBlock(obj)
if not objBlock then
break
end
if objBlock.start <= finish
and objBlock.finish >= finish then
lastAssign = obj
end
::CONTINUE::
end
return lastAssign
end
---@param pos integer
function mt:resetCastsIndex(pos)
for i = 1, #self.casts do
local cast = self.casts[i]
if cast.start > pos then
self.castIndex = i
return
end
end
self.castIndex = nil
end
---@param pos integer
---@param node vm.node
---@return vm.node
function mt:fastWardCasts(pos, node)
if not self.castIndex then
return node
end
for i = self.castIndex, #self.casts do
local action = self.casts[i]
if action.start > pos then
return node
end
node = node:copy()
for _, cast in ipairs(action.casts) do
if cast.mode == '+' then
if cast.optional then
node:addOptional()
end
if cast.extends then
node:merge(vm.compileNode(cast.extends))
end
elseif cast.mode == '-' then
if cast.optional then
node:removeOptional()
end
if cast.extends then
node:removeNode(vm.compileNode(cast.extends))
end
else
if cast.extends then
node:clear()
node:merge(vm.compileNode(cast.extends))
end
end
end
end
self.castIndex = self.castIndex + 1
return node
end
local lookIntoChild = util.switch()
: case 'getlocal'
: case 'getglobal'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
if tracer.getMap[action] then
tracer.nodes[action] = topNode
if outNode then
topNode = topNode:copy():setTruthy()
outNode = outNode:copy():setFalsy()
end
end
return topNode, outNode
end)
: case 'repeat'
: case 'loop'
: case 'for'
: case 'do'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
if action.type == 'loop' then
tracer:lookIntoChild(action.init, topNode)
tracer:lookIntoChild(action.max, topNode)
end
if action[1] then
tracer:lookIntoBlock(action, action.bstart, topNode:copy())
local lastAssign = tracer:getLastAssign(action.start, action.finish)
if lastAssign then
tracer:getNode(lastAssign)
end
if tracer.nodes[action] then
topNode = tracer.nodes[action]:copy()
end
end
return topNode, outNode
end)
: case 'in'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
tracer:lookIntoChild(action.exps, topNode)
if action[1] then
tracer:lookIntoBlock(action, action.bstart, topNode:copy())
local lastAssign = tracer:getLastAssign(action.start, action.finish)
if lastAssign then
tracer:getNode(lastAssign)
end
if tracer.nodes[action] then
topNode = tracer.nodes[action]:copy()
end
end
return topNode, outNode
end)
: case 'while'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
local blockNode, mainNode
if action.filter then
blockNode, mainNode = tracer:lookIntoChild(action.filter, topNode:copy(), topNode:copy())
else
blockNode = topNode:copy()
mainNode = topNode:copy()
end
if action[1] then
tracer:lookIntoBlock(action, action.bstart, blockNode:copy())
local lastAssign = tracer:getLastAssign(action.start, action.finish)
if lastAssign then
tracer:getNode(lastAssign)
end
if tracer.nodes[action] then
topNode = mainNode:merge(tracer.nodes[action])
end
end
if action.filter then
-- look into filter again
guide.eachSource(action.filter, function (src)
tracer.mark[src] = nil
end)
blockNode, topNode = tracer:lookIntoChild(action.filter, topNode:copy(), topNode:copy())
end
return topNode, outNode
end)
: case 'if'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
local hasElse
local mainNode = topNode:copy()
local blockNodes = {}
for _, subBlock in ipairs(action) do
tracer:resetCastsIndex(subBlock.start)
local blockNode = mainNode:copy()
if subBlock.filter then
blockNode, mainNode = tracer:lookIntoChild(subBlock.filter, blockNode, mainNode)
else
hasElse = true
mainNode:clear()
end
local mergedNode
if subBlock[1] then
tracer:lookIntoBlock(subBlock, subBlock.bstart, blockNode:copy())
local neverReturn = subBlock.hasReturn
or subBlock.hasGoTo
or subBlock.hasBreak
or subBlock.hasExit
if neverReturn then
mergedNode = true
else
local lastAssign = tracer:getLastAssign(subBlock.start, subBlock.finish)
if lastAssign then
tracer:getNode(lastAssign)
end
if tracer.nodes[subBlock] then
blockNodes[#blockNodes+1] = tracer.nodes[subBlock]
mergedNode = true
end
end
end
if not mergedNode then
blockNodes[#blockNodes+1] = blockNode
end
end
if not hasElse and not topNode:hasKnownType() then
mainNode:merge(vm.declareGlobal('type', 'unknown'))
end
for _, blockNode in ipairs(blockNodes) do
mainNode:merge(blockNode)
end
topNode = mainNode
return topNode, outNode
end)
: case 'getfield'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
tracer:lookIntoChild(action.node, topNode)
tracer:lookIntoChild(action.field, topNode)
if tracer.getMap[action] then
tracer.nodes[action] = topNode
if outNode then
topNode = topNode:copy():setTruthy()
outNode = outNode:copy():setFalsy()
end
end
return topNode, outNode
end)
: case 'getmethod'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
tracer:lookIntoChild(action.node, topNode)
tracer:lookIntoChild(action.method, topNode)
if tracer.getMap[action] then
tracer.nodes[action] = topNode
if outNode then
topNode = topNode:copy():setTruthy()
outNode = outNode:copy():setFalsy()
end
end
return topNode, outNode
end)
: case 'getindex'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
tracer:lookIntoChild(action.node, topNode)
tracer:lookIntoChild(action.index, topNode)
if tracer.getMap[action] then
tracer.nodes[action] = topNode
if outNode then
topNode = topNode:copy():setTruthy()
outNode = outNode:copy():setFalsy()
end
end
return topNode, outNode
end)
: case 'setfield'
: case 'setmethod'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
tracer:lookIntoChild(action.node, topNode)
tracer:lookIntoChild(action.value, topNode)
return topNode, outNode
end)
: case 'setglobal'
: case 'setlocal'
: case 'tablefield'
: case 'tableexp'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
tracer:lookIntoChild(action.value, topNode)
return topNode, outNode
end)
: case 'setindex'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
tracer:lookIntoChild(action.node, topNode)
tracer:lookIntoChild(action.index, topNode)
tracer:lookIntoChild(action.value, topNode)
return topNode, outNode
end)
: case 'tableindex'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
tracer:lookIntoChild(action.index, topNode)
tracer:lookIntoChild(action.value, topNode)
return topNode, outNode
end)
: case 'local'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
tracer:lookIntoChild(action.value, topNode)
-- special treat for `local tp = type(x)`
if action.value
and action.ref
and action.value.type == 'select' then
local index = action.value.sindex
local call = action.value.vararg
if index == 1
and call.type == 'call'
and call.node
and call.node.special == 'type'
and call.args then
local getVar = call.args[1]
if getVar
and tracer.getMap[getVar] then
for _, ref in ipairs(action.ref) do
tracer:collectCare(ref)
end
end
end
end
return topNode, outNode
end)
: case 'return'
: case 'table'
: case 'callargs'
: case 'list'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
for _, ret in ipairs(action) do
tracer:lookIntoChild(ret, topNode:copy())
end
return topNode, outNode
end)
: case 'select'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
tracer:lookIntoChild(action.vararg, topNode)
return topNode, outNode
end)
: case 'function'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
tracer:lookIntoBlock(action, action.bstart, topNode:copy())
return topNode, outNode
end)
: case 'paren'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
topNode, outNode = tracer:lookIntoChild(action.exp, topNode, outNode)
return topNode, outNode
end)
: case 'call'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
if action.node.special == 'assert' and action.args and action.args[1] then
for i = 2, #action.args do
tracer:lookIntoChild(action.args[i], topNode, topNode:copy())
end
topNode = tracer:lookIntoChild(action.args[1], topNode:copy(), topNode:copy())
end
tracer:lookIntoChild(action.node, topNode)
tracer:lookIntoChild(action.args, topNode)
return topNode, outNode
end)
: case 'binary'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
if not action[1] or not action[2] then
tracer:lookIntoChild(action[1], topNode)
tracer:lookIntoChild(action[2], topNode)
return topNode, outNode
end
if action.op.type == 'and' then
topNode = tracer:lookIntoChild(action[1], topNode, topNode:copy())
topNode = tracer:lookIntoChild(action[2], topNode, topNode:copy())
elseif action.op.type == 'or' then
outNode = outNode or topNode:copy()
local topNode1, outNode1 = tracer:lookIntoChild(action[1], topNode, outNode)
local topNode2, outNode2 = tracer:lookIntoChild(action[2], outNode1, outNode1:copy())
topNode = vm.createNode(topNode1, topNode2)
outNode = outNode2:copy()
elseif action.op.type == '=='
or action.op.type == '~=' then
local handler, checker
for i = 1, 2 do
if guide.isLiteral(action[i]) then
checker = action[i]
handler = action[3-i] -- Copilot tells me use `3-i` instead of `i%2+1`
end
end
if not handler then
tracer:lookIntoChild(action[1], topNode)
tracer:lookIntoChild(action[2], topNode)
return topNode, outNode
end
if tracer.getMap[handler] then
-- if x == y then
topNode = tracer:lookIntoChild(handler, topNode, outNode)
local checkerNode = vm.compileNode(checker)
local checkerName = vm.getNodeName(checker)
if checkerName then
topNode = topNode:copy()
if action.op.type == '==' then
topNode:narrow(tracer.uri, checkerName)
if outNode then
outNode:removeNode(checkerNode)
end
else
topNode:removeNode(checkerNode)
if outNode then
outNode:narrow(tracer.uri, checkerName)
end
end
end
elseif handler.type == 'call'
and checker.type == 'string'
and handler.node.special == 'type'
and handler.args
and handler.args[1]
and tracer.getMap[handler.args[1]] then
-- if type(x) == 'string' then
tracer:lookIntoChild(handler, topNode:copy())
if action.op.type == '==' then
topNode:narrow(tracer.uri, checker[1])
if outNode then
outNode:remove(checker[1])
end
else
topNode:remove(checker[1])
if outNode then
outNode:narrow(tracer.uri, checker[1])
end
end
elseif handler.type == 'getlocal'
and checker.type == 'string' then
-- `local tp = type(x);if tp == 'string' then`
local nodeValue = vm.getObjectValue(handler.node)
if nodeValue
and nodeValue.type == 'select'
and nodeValue.sindex == 1 then
local call = nodeValue.vararg
if call
and call.type == 'call'
and call.node.special == 'type'
and call.args
and tracer.getMap[call.args[1]] then
if action.op.type == '==' then
topNode:narrow(tracer.uri, checker[1])
if outNode then
outNode:remove(checker[1])
end
else
topNode:remove(checker[1])
if outNode then
outNode:narrow(tracer.uri, checker[1])
end
end
end
end
end
end
tracer:lookIntoChild(action[1], topNode)
tracer:lookIntoChild(action[2], topNode)
return topNode, outNode
end)
: case 'unary'
---@param tracer vm.tracer
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
: call(function (tracer, action, topNode, outNode)
if not action[1] then
tracer:lookIntoChild(action[1], topNode)
return topNode, outNode
end
if action.op.type == 'not' then
outNode = outNode or topNode:copy()
outNode, topNode = tracer:lookIntoChild(action[1], topNode, outNode)
outNode = outNode:copy()
end
tracer:lookIntoChild(action[1], topNode)
return topNode, outNode
end)
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
---@return vm.node topNode
---@return vm.node outNode
function mt:lookIntoChild(action, topNode, outNode)
if not self.careMap[action]
or self.mark[action] then
return topNode, outNode or topNode
end
self.mark[action] = true
topNode = self:fastWardCasts(action.start, topNode)
topNode, outNode = lookIntoChild(action.type, self, action, topNode, outNode)
return topNode, outNode or topNode
end
---@param block parser.object
---@param start integer
---@param node vm.node
function mt:lookIntoBlock(block, start, node)
self:resetCastsIndex(start)
for _, action in ipairs(block) do
if (action.effect or action.start) < start then
goto CONTINUE
end
if self.careMap[action] then
node = self:lookIntoChild(action, node)
if action.type == 'do'
or action.type == 'loop'
or action.type == 'in'
or action.type == 'repeat' then
return
end
end
if action.finish > start and self.assignMap[action] then
return
end
::CONTINUE::
end
self.nodes[block] = node
if block.type == 'do'
or block.type == 'loop'
or block.type == 'in'
or block.type == 'repeat' then
self:lookIntoBlock(block.parent, block.finish, node)
end
end
---@param source parser.object
function mt:calcNode(source)
if self.getMap[source] then
local lastAssign = self:getLastAssign(0, source.finish)
if not lastAssign then
return
end
if self.fastCalc then
self.nodes[source] = vm.compileNode(lastAssign)
return
end
self:calcNode(lastAssign)
return
end
if self.assignMap[source] then
local node = vm.compileNode(source)
self.nodes[source] = node
local parentBlock = guide.getParentBlock(source)
if parentBlock then
self:lookIntoBlock(parentBlock, source.finish, node)
end
return
end
end
---@param source parser.object
---@return vm.node?
function mt:getNode(source)
local cache = self.nodes[source]
if cache ~= nil then
return cache or nil
end
if source == self.main then
self.nodes[source] = false
return nil
end
self.nodes[source] = false
self:calcNode(source)
return self.nodes[source] or nil
end
---@class vm.node
---@field package _tracer vm.tracer
---@param mode tracer.mode
---@param source parser.object | vm.variable
---@param name string
---@return vm.tracer?
local function createTracer(mode, source, name)
local node = vm.compileNode(source)
local tracer = node._tracer
if tracer then
return tracer
end
local main
if source.type == 'variable' then
---@cast source vm.variable
main = guide.getParentBlock(source.base)
else
---@cast source parser.object
main = guide.getParentBlock(source)
end
if not main then
return nil
end
tracer = setmetatable({
source = source,
mode = mode,
name = name,
assigns = {},
assignMap = {},
getMap = {},
careMap = {},
mark = {},
casts = {},
nodes = {},
main = main,
uri = guide.getUri(main),
}, mt)
node._tracer = tracer
if tracer.mode == 'local' then
tracer:collectLocal()
else
tracer:collectGlobal()
end
return tracer
end
---@param source parser.object
---@return vm.node?
function vm.traceNode(source)
local mode, base, name
if vm.getGlobalNode(source) then
base = vm.getGlobalBase(source)
if not base then
return nil
end
mode = 'global'
name = base.global:getCodeName()
else
base = vm.getVariable(source)
if not base then
return nil
end
name = base:getCodeName()
mode = 'local'
end
local tracer = createTracer(mode, base, name)
if not tracer then
return nil
end
local node = tracer:getNode(source)
return node
end
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