291 lines
9.0 KiB
Nim
291 lines
9.0 KiB
Nim
#
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#
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# Nim's Runtime Library
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# (c) Copyright 2021 Nim contributors
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#
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# See the file "copying.txt", included in this
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# distribution, for details about the copyright.
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#
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## This module provides basic primitives for creating parallel programs.
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## A `Task` should be only owned by a single Thread, it cannot be shared by threads.
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import std/[macros, typetraits]
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import system/ansi_c
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import ./isolation
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export isolation
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when compileOption("threads"):
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from ./effecttraits import isGcSafe
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#
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# proc hello(a: int, b: string) =
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# echo $a & b
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#
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# let literal = "Nim"
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# let t = toTask(hello(521, literal))
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#
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#
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# is roughly converted to
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#
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# type
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# ScratchObj_369098780 = object
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# a: int
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# b: string
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#
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# let scratch_369098762 = cast[ptr ScratchObj_369098780](c_calloc(csize_t 1,
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# csize_t sizeof(ScratchObj_369098780)))
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# if scratch_369098762.isNil:
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# raise newException(OutOfMemDefect, "Could not allocate memory")
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# block:
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# var isolate_369098776 = isolate(521)
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# scratch_369098762.a = extract(isolate_369098776)
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# var isolate_369098778 = isolate(literal)
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# scratch_369098762.b = extract(isolate_369098778)
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# proc hello_369098781(args`gensym3: pointer) {.nimcall.} =
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# let objTemp_369098775 = cast[ptr ScratchObj_369098780](args`gensym3)
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# let :tmp_369098777 = objTemp_369098775.a
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# let :tmp_369098779 = objTemp_369098775.b
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# hello(a = :tmp_369098777, b = :tmp_369098779)
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#
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# proc destroyScratch_369098782(args`gensym3: pointer) {.nimcall.} =
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# let obj_369098783 = cast[ptr ScratchObj_369098780](args`gensym3)
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# =destroy(obj_369098783[])
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# let t = Task(callback: hello_369098781, args: scratch_369098762, destroy: destroyScratch_369098782)
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#
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type
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Task* = object ## `Task` contains the callback and its arguments.
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callback: proc (args: pointer) {.nimcall, gcsafe.}
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args: pointer
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destroy: proc (args: pointer) {.nimcall, gcsafe.}
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# XXX: ⚠️ No destructors for 1.2 due to unreliable codegen
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# proc `=copy`*(x: var Task, y: Task) {.error.}
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proc shim_destroy*(t: var Task) {.inline, gcsafe.} =
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## Frees the resources allocated for a `Task`.
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if t.args != nil:
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if t.destroy != nil:
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t.destroy(t.args)
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c_free(t.args)
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proc invoke*(task: Task) {.inline, gcsafe.} =
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## Invokes the `task`.
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assert task.callback != nil
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task.callback(task.args)
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template checkIsolate(scratchAssignList: seq[NimNode], procParam, scratchDotExpr: NimNode) =
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# block:
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# var isoTempA = isolate(521)
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# scratch.a = extract(isolateA)
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# var isoTempB = isolate(literal)
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# scratch.b = extract(isolateB)
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let isolatedTemp = genSym(nskTemp, "isoTemp")
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# XXX: Fix sym bindings
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# scratchAssignList.add newVarStmt(isolatedTemp, newCall(newidentNode("isolate"), procParam))
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# scratchAssignList.add newAssignment(scratchDotExpr,
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# newcall(newIdentNode("extract"), isolatedTemp))
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scratchAssignList.add newVarStmt(isolatedTemp, newCall(bindSym("isolate"), procParam))
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scratchAssignList.add newAssignment(scratchDotExpr,
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newcall(bindSym("extract"), isolatedTemp))
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template addAllNode(assignParam: NimNode, procParam: NimNode) =
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let scratchDotExpr = newDotExpr(scratchIdent, formalParams[i][0])
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checkIsolate(scratchAssignList, procParam, scratchDotExpr)
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let tempNode = genSym(kind = nskTemp, ident = formalParams[i][0].strVal)
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callNode.add nnkExprEqExpr.newTree(formalParams[i][0], tempNode)
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tempAssignList.add newLetStmt(tempNode, newDotExpr(objTemp, formalParams[i][0]))
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scratchRecList.add newIdentDefs(newIdentNode(formalParams[i][0].strVal), assignParam)
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macro toTask*(e: typed{nkCall | nkInfix | nkPrefix | nkPostfix | nkCommand | nkCallStrLit}): Task =
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## Converts the call and its arguments to `Task`.
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runnableExamples("--gc:orc"):
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proc hello(a: int) = echo a
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let b = toTask hello(13)
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assert b is Task
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doAssert getTypeInst(e).typeKind == ntyVoid
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# requires 1.6
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# when compileOption("threads"):
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# if not isGcSafe(e[0]):
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# error("'toTask' takes a GC safe call expression")
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# TODO
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# https://github.com/nim-lang/Nim/pull/17501/files
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#
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# if hasClosure(e[0]):
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# error("closure call is not allowed")
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if e.len > 1:
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let scratchIdent = genSym(kind = nskTemp, ident = "scratch")
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let impl = e[0].getTypeInst
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when defined(nimTasksDebug):
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echo impl.treeRepr
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echo e.treeRepr
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let formalParams = impl[0]
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var
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scratchRecList = newNimNode(nnkRecList)
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scratchAssignList: seq[NimNode]
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tempAssignList: seq[NimNode]
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callNode: seq[NimNode]
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let
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objTemp = genSym(nskTemp, ident = "objTemp")
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for i in 1 ..< formalParams.len:
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var param = formalParams[i][1]
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if param.kind == nnkBracketExpr and param[0].eqIdent("sink"):
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param = param[0]
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if param.typeKind in {ntyExpr, ntyStmt}:
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error("'toTask'ed function cannot have a 'typed' or 'untyped' parameter")
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case param.kind
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of nnkVarTy:
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error("'toTask'ed function cannot have a 'var' parameter")
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of nnkBracketExpr:
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if param[0].typeKind == ntyTypeDesc:
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callNode.add nnkExprEqExpr.newTree(formalParams[i][0], e[i])
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elif param[0].typeKind in {ntyVarargs, ntyOpenArray}:
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if param[1].typeKind in {ntyExpr, ntyStmt}:
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error("'toTask'ed function cannot have a 'typed' or 'untyped' parameter")
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let
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seqType = nnkBracketExpr.newTree(newIdentNode("seq"), param[1])
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seqCallNode = newcall("@", e[i])
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addAllNode(seqType, seqCallNode)
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else:
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addAllNode(param, e[i])
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of nnkBracket, nnkObjConstr:
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# passing by static parameters
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# so we pass them directly instead of passing by scratchObj
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callNode.add nnkExprEqExpr.newTree(formalParams[i][0], e[i])
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of nnkSym, nnkPtrTy:
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addAllNode(param, e[i])
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of nnkCharLit..nnkNilLit:
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callNode.add nnkExprEqExpr.newTree(formalParams[i][0], e[i])
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else:
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error("not supported type kinds")
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let scratchObjType = genSym(kind = nskType, ident = "ScratchObj")
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let scratchObj = nnkTypeSection.newTree(
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nnkTypeDef.newTree(
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scratchObjType,
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newEmptyNode(),
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nnkObjectTy.newTree(
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newEmptyNode(),
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newEmptyNode(),
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scratchRecList
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)
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)
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)
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let scratchObjPtrType = quote do:
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cast[ptr `scratchObjType`](c_calloc(csize_t 1, csize_t sizeof(`scratchObjType`)))
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let scratchLetSection = newLetStmt(
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scratchIdent,
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scratchObjPtrType
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)
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let scratchCheck = quote do:
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if `scratchIdent`.isNil:
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# Renamed in 1.4
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# raise newException(OutOfMemDefect, "Could not allocate memory")
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raise newException(OutOfMemError, "Could not allocate memory")
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var stmtList = newStmtList()
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stmtList.add(scratchObj)
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stmtList.add(scratchLetSection)
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stmtList.add(scratchCheck)
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stmtList.add(nnkBlockStmt.newTree(newEmptyNode(), newStmtList(scratchAssignList)))
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var functionStmtList = newStmtList()
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let funcCall = newCall(e[0], callNode)
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functionStmtList.add tempAssignList
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functionStmtList.add funcCall
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let funcName = genSym(nskProc, e[0].strVal)
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let destroyName = genSym(nskProc, "destroyScratch")
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let objTemp2 = genSym(ident = "obj")
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let tempNode = quote("@") do:
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# XXX:
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# We avoid destructors for Nim 1.2 due to bad codegen
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# For taskpool there are no destructor to run.
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# We ensure that by checking that we only operate on plain old data
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static: doAssert supportsCopyMem(@scratchObjType)
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# `=destroy`(@objTemp2[])
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result = quote do:
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`stmtList`
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proc `funcName`(args: pointer) {.gcsafe, nimcall.} =
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let `objTemp` = cast[ptr `scratchObjType`](args)
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`functionStmtList`
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proc `destroyName`(args: pointer) {.nimcall.} =
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let `objTemp2` = cast[ptr `scratchObjType`](args)
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`tempNode`
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Task(callback: `funcName`, args: `scratchIdent`, destroy: `destroyName`)
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else:
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let funcCall = newCall(e[0])
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let funcName = genSym(nskProc, e[0].strVal)
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result = quote do:
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proc `funcName`(args: pointer) {.gcsafe, nimcall.} =
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`funcCall`
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Task(callback: `funcName`, args: nil)
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when defined(nimTasksDebug):
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echo result.repr
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runnableExamples("--gc:orc"):
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block:
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var num = 0
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proc hello(a: int) = inc num, a
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let b = toTask hello(13)
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b.invoke()
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assert num == 13
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# A task can be invoked multiple times
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b.invoke()
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assert num == 26
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block:
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type
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Runnable = ref object
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data: int
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var data: int
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proc hello(a: Runnable) {.nimcall.} =
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a.data += 2
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data = a.data
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when false:
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# the parameters of call must be isolated.
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let x = Runnable(data: 12)
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let b = toTask hello(x) # error ----> expression cannot be isolated: x
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b.invoke()
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let b = toTask(hello(Runnable(data: 12)))
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b.invoke()
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assert data == 14
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b.invoke()
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assert data == 16
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