From c40aac8e2036924ec88bec9c44a33a044f346baa Mon Sep 17 00:00:00 2001 From: Araq Date: Sun, 8 Mar 2015 13:05:44 +0100 Subject: GC: get rid of pathological behaviour for stack marking --- compiler/transf.nim | 264 ++++++++++++++++++++++++++-------------------------- 1 file changed, 132 insertions(+), 132 deletions(-) (limited to 'compiler/transf.nim') diff --git a/compiler/transf.nim b/compiler/transf.nim index 2f520aa20..e5e3bbe63 100644 --- a/compiler/transf.nim +++ b/compiler/transf.nim @@ -17,27 +17,27 @@ # * introduces method dispatchers # * performs lambda lifting for closure support -import - intsets, strutils, lists, options, ast, astalgo, trees, treetab, msgs, os, +import + intsets, strutils, lists, options, ast, astalgo, trees, treetab, msgs, os, idents, renderer, types, passes, semfold, magicsys, cgmeth, rodread, lambdalifting, sempass2, lowerings # implementation -type +type PTransNode* = distinct PNode - + PTransCon = ref TTransCon TTransCon{.final.} = object # part of TContext; stackable mapping: TIdNodeTable # mapping from symbols to nodes owner: PSym # current owner forStmt: PNode # current for stmt - forLoopBody: PTransNode # transformed for loop body - yieldStmts: int # we count the number of yield statements, + forLoopBody: PTransNode # transformed for loop body + yieldStmts: int # we count the number of yield statements, # because we need to introduce new variables # if we encounter the 2nd yield statement next: PTransCon # for stacking - + TTransfContext = object of passes.TPassContext module: PSym transCon: PTransCon # top of a TransCon stack @@ -46,52 +46,52 @@ type contSyms, breakSyms: seq[PSym] # to transform 'continue' and 'break' PTransf = ref TTransfContext -proc newTransNode(a: PNode): PTransNode {.inline.} = +proc newTransNode(a: PNode): PTransNode {.inline.} = result = PTransNode(shallowCopy(a)) -proc newTransNode(kind: TNodeKind, info: TLineInfo, - sons: int): PTransNode {.inline.} = +proc newTransNode(kind: TNodeKind, info: TLineInfo, + sons: int): PTransNode {.inline.} = var x = newNodeI(kind, info) newSeq(x.sons, sons) result = x.PTransNode -proc newTransNode(kind: TNodeKind, n: PNode, - sons: int): PTransNode {.inline.} = +proc newTransNode(kind: TNodeKind, n: PNode, + sons: int): PTransNode {.inline.} = var x = newNodeIT(kind, n.info, n.typ) newSeq(x.sons, sons) x.typ = n.typ result = x.PTransNode -proc `[]=`(a: PTransNode, i: int, x: PTransNode) {.inline.} = +proc `[]=`(a: PTransNode, i: int, x: PTransNode) {.inline.} = var n = PNode(a) n.sons[i] = PNode(x) -proc `[]`(a: PTransNode, i: int): PTransNode {.inline.} = +proc `[]`(a: PTransNode, i: int): PTransNode {.inline.} = var n = PNode(a) result = n.sons[i].PTransNode - + proc add(a, b: PTransNode) {.inline.} = addSon(PNode(a), PNode(b)) proc len(a: PTransNode): int {.inline.} = result = sonsLen(a.PNode) -proc newTransCon(owner: PSym): PTransCon = +proc newTransCon(owner: PSym): PTransCon = assert owner != nil new(result) initIdNodeTable(result.mapping) result.owner = owner -proc pushTransCon(c: PTransf, t: PTransCon) = +proc pushTransCon(c: PTransf, t: PTransCon) = t.next = c.transCon c.transCon = t -proc popTransCon(c: PTransf) = +proc popTransCon(c: PTransf) = if (c.transCon == nil): internalError("popTransCon") c.transCon = c.transCon.next -proc getCurrOwner(c: PTransf): PSym = +proc getCurrOwner(c: PTransf): PSym = if c.transCon != nil: result = c.transCon.owner else: result = c.module - -proc newTemp(c: PTransf, typ: PType, info: TLineInfo): PSym = + +proc newTemp(c: PTransf, typ: PType, info: TLineInfo): PSym = result = newSym(skTemp, getIdent(genPrefix), getCurrOwner(c), info) result.typ = skipTypes(typ, {tyGenericInst}) incl(result.flags, sfFromGeneric) @@ -100,10 +100,10 @@ proc transform(c: PTransf, n: PNode): PTransNode proc transformSons(c: PTransf, n: PNode): PTransNode = result = newTransNode(n) - for i in countup(0, sonsLen(n)-1): + for i in countup(0, sonsLen(n)-1): result[i] = transform(c, n.sons[i]) -proc newAsgnStmt(c: PTransf, le: PNode, ri: PTransNode): PTransNode = +proc newAsgnStmt(c: PTransf, le: PNode, ri: PTransNode): PTransNode = result = newTransNode(nkFastAsgn, PNode(ri).info, 2) result[0] = PTransNode(le) result[1] = ri @@ -113,30 +113,30 @@ proc transformSymAux(c: PTransf, n: PNode): PNode = # return liftIterSym(n) var b: PNode var tc = c.transCon - if sfBorrow in n.sym.flags: + if sfBorrow in n.sym.flags: # simply exchange the symbol: b = n.sym.getBody if b.kind != nkSym: internalError(n.info, "wrong AST for borrowed symbol") b = newSymNode(b.sym) b.info = n.info - else: + else: b = n - while tc != nil: + while tc != nil: result = idNodeTableGet(tc.mapping, b.sym) if result != nil: return tc = tc.next result = b -proc transformSym(c: PTransf, n: PNode): PTransNode = +proc transformSym(c: PTransf, n: PNode): PTransNode = result = PTransNode(transformSymAux(c, n)) proc transformVarSection(c: PTransf, v: PNode): PTransNode = result = newTransNode(v) for i in countup(0, sonsLen(v)-1): var it = v.sons[i] - if it.kind == nkCommentStmt: + if it.kind == nkCommentStmt: result[i] = PTransNode(it) - elif it.kind == nkIdentDefs: + elif it.kind == nkIdentDefs: if it.sons[0].kind != nkSym: internalError(it.info, "transformVarSection") internalAssert(it.len == 3) var newVar = copySym(it.sons[0].sym) @@ -153,12 +153,12 @@ proc transformVarSection(c: PTransf, v: PNode): PTransNode = defs[1] = it.sons[1].PTransNode defs[2] = transform(c, it.sons[2]) result[i] = defs - else: - if it.kind != nkVarTuple: + else: + if it.kind != nkVarTuple: internalError(it.info, "transformVarSection: not nkVarTuple") var L = sonsLen(it) var defs = newTransNode(it.kind, it.info, L) - for j in countup(0, L-3): + for j in countup(0, L-3): var newVar = copySym(it.sons[j].sym) incl(newVar.flags, sfFromGeneric) newVar.owner = getCurrOwner(c) @@ -188,12 +188,12 @@ proc transformConstSection(c: PTransf, v: PNode): PTransNode = else: result[i] = PTransNode(it) -proc hasContinue(n: PNode): bool = +proc hasContinue(n: PNode): bool = case n.kind of nkEmpty..nkNilLit, nkForStmt, nkParForStmt, nkWhileStmt: discard of nkContinueStmt: result = true - else: - for i in countup(0, sonsLen(n) - 1): + else: + for i in countup(0, sonsLen(n) - 1): if hasContinue(n.sons[i]): return true proc newLabel(c: PTransf, n: PNode): PSym = @@ -224,10 +224,10 @@ proc transformBlock(c: PTransf, n: PNode): PTransNode = discard c.breakSyms.pop result[0] = newSymNode(labl).PTransNode -proc transformLoopBody(c: PTransf, n: PNode): PTransNode = - # What if it contains "continue" and "break"? "break" needs +proc transformLoopBody(c: PTransf, n: PNode): PTransNode = + # What if it contains "continue" and "break"? "break" needs # an explicit label too, but not the same! - + # We fix this here by making every 'break' belong to its enclosing loop # and changing all breaks that belong to a 'block' by annotating it with # a label (if it hasn't one already). @@ -239,7 +239,7 @@ proc transformLoopBody(c: PTransf, n: PNode): PTransNode = result[0] = newSymNode(labl).PTransNode result[1] = transform(c, n) discard c.contSyms.pop() - else: + else: result = transform(c, n) proc transformWhile(c: PTransf; n: PNode): PTransNode = @@ -273,27 +273,27 @@ proc transformBreak(c: PTransf, n: PNode): PTransNode = result = transformSons(c, n) result[0] = newSymNode(labl).PTransNode -proc unpackTuple(c: PTransf, n: PNode, father: PTransNode) = +proc unpackTuple(c: PTransf, n: PNode, father: PTransNode) = # XXX: BUG: what if `n` is an expression with side-effects? - for i in countup(0, sonsLen(c.transCon.forStmt) - 3): - add(father, newAsgnStmt(c, c.transCon.forStmt.sons[i], + for i in countup(0, sonsLen(c.transCon.forStmt) - 3): + add(father, newAsgnStmt(c, c.transCon.forStmt.sons[i], transform(c, newTupleAccess(n, i)))) -proc introduceNewLocalVars(c: PTransf, n: PNode): PTransNode = +proc introduceNewLocalVars(c: PTransf, n: PNode): PTransNode = case n.kind - of nkSym: + of nkSym: result = transformSym(c, n) - of nkEmpty..pred(nkSym), succ(nkSym)..nkNilLit: + of nkEmpty..pred(nkSym), succ(nkSym)..nkNilLit: # nothing to be done for leaves: result = PTransNode(n) of nkVarSection, nkLetSection: result = transformVarSection(c, n) else: result = newTransNode(n) - for i in countup(0, sonsLen(n)-1): + for i in countup(0, sonsLen(n)-1): result[i] = introduceNewLocalVars(c, n.sons[i]) -proc transformYield(c: PTransf, n: PNode): PTransNode = +proc transformYield(c: PTransf, n: PNode): PTransNode = result = newTransNode(nkStmtList, n.info, 0) var e = n.sons[0] # c.transCon.forStmt.len == 3 means that there is one for loop variable @@ -301,21 +301,21 @@ proc transformYield(c: PTransf, n: PNode): PTransNode = if skipTypes(e.typ, {tyGenericInst}).kind == tyTuple and c.transCon.forStmt.len != 3: e = skipConv(e) - if e.kind == nkPar: - for i in countup(0, sonsLen(e) - 1): - add(result, newAsgnStmt(c, c.transCon.forStmt.sons[i], + if e.kind == nkPar: + for i in countup(0, sonsLen(e) - 1): + add(result, newAsgnStmt(c, c.transCon.forStmt.sons[i], transform(c, e.sons[i]))) - else: + else: unpackTuple(c, e, result) - else: + else: var x = transform(c, e) add(result, newAsgnStmt(c, c.transCon.forStmt.sons[0], x)) - + inc(c.transCon.yieldStmts) if c.transCon.yieldStmts <= 1: # common case add(result, c.transCon.forLoopBody) - else: + else: # we need to introduce new local variables: add(result, introduceNewLocalVars(c, c.transCon.forLoopBody.PNode)) @@ -340,25 +340,25 @@ proc transformAddrDeref(c: PTransf, n: PNode, a, b: TNodeKind): PTransNode = if n.sons[0].kind == a or n.sons[0].kind == b: # addr ( deref ( x )) --> x result = PTransNode(n.sons[0].sons[0]) - -proc transformConv(c: PTransf, n: PNode): PTransNode = + +proc transformConv(c: PTransf, n: PNode): PTransNode = # numeric types need range checks: var dest = skipTypes(n.typ, abstractVarRange) var source = skipTypes(n.sons[1].typ, abstractVarRange) case dest.kind - of tyInt..tyInt64, tyEnum, tyChar, tyBool, tyUInt8..tyUInt32: + of tyInt..tyInt64, tyEnum, tyChar, tyBool, tyUInt8..tyUInt32: # we don't include uint and uint64 here as these are no ordinal types ;-) if not isOrdinalType(source): # float -> int conversions. ugh. result = transformSons(c, n) elif firstOrd(n.typ) <= firstOrd(n.sons[1].typ) and - lastOrd(n.sons[1].typ) <= lastOrd(n.typ): + lastOrd(n.sons[1].typ) <= lastOrd(n.typ): # BUGFIX: simply leave n as it is; we need a nkConv node, # but no range check: result = transformSons(c, n) - else: + else: # generate a range check: - if dest.kind == tyInt64 or source.kind == tyInt64: + if dest.kind == tyInt64 or source.kind == tyInt64: result = newTransNode(nkChckRange64, n, 3) else: result = newTransNode(nkChckRange, n, 3) @@ -368,7 +368,7 @@ proc transformConv(c: PTransf, n: PNode): PTransNode = result[2] = newIntTypeNode(nkIntLit, lastOrd(dest), source).PTransNode of tyFloat..tyFloat128: # XXX int64 -> float conversion? - if skipTypes(n.typ, abstractVar).kind == tyRange: + if skipTypes(n.typ, abstractVar).kind == tyRange: result = newTransNode(nkChckRangeF, n, 3) dest = skipTypes(n.typ, abstractVar) result[0] = transform(c, n.sons[1]) @@ -378,81 +378,81 @@ proc transformConv(c: PTransf, n: PNode): PTransNode = result = transformSons(c, n) of tyOpenArray, tyVarargs: result = transform(c, n.sons[1]) - of tyCString: - if source.kind == tyString: + of tyCString: + if source.kind == tyString: result = newTransNode(nkStringToCString, n, 1) result[0] = transform(c, n.sons[1]) else: result = transformSons(c, n) - of tyString: - if source.kind == tyCString: + of tyString: + if source.kind == tyCString: result = newTransNode(nkCStringToString, n, 1) result[0] = transform(c, n.sons[1]) else: result = transformSons(c, n) - of tyRef, tyPtr: + of tyRef, tyPtr: dest = skipTypes(dest, abstractPtrs) source = skipTypes(source, abstractPtrs) - if source.kind == tyObject: + if source.kind == tyObject: var diff = inheritanceDiff(dest, source) - if diff < 0: + if diff < 0: result = newTransNode(nkObjUpConv, n, 1) result[0] = transform(c, n.sons[1]) - elif diff > 0: + elif diff > 0: result = newTransNode(nkObjDownConv, n, 1) result[0] = transform(c, n.sons[1]) - else: + else: result = transform(c, n.sons[1]) else: result = transformSons(c, n) - of tyObject: + of tyObject: var diff = inheritanceDiff(dest, source) - if diff < 0: + if diff < 0: result = newTransNode(nkObjUpConv, n, 1) result[0] = transform(c, n.sons[1]) - elif diff > 0: + elif diff > 0: result = newTransNode(nkObjDownConv, n, 1) result[0] = transform(c, n.sons[1]) - else: + else: result = transform(c, n.sons[1]) of tyGenericParam, tyOrdinal: result = transform(c, n.sons[1]) # happens sometimes for generated assignments, etc. - else: + else: result = transformSons(c, n) - -type - TPutArgInto = enum + +type + TPutArgInto = enum paDirectMapping, paFastAsgn, paVarAsgn -proc putArgInto(arg: PNode, formal: PType): TPutArgInto = +proc putArgInto(arg: PNode, formal: PType): TPutArgInto = # This analyses how to treat the mapping "formal <-> arg" in an # inline context. if skipTypes(formal, abstractInst).kind in {tyOpenArray, tyVarargs}: return paDirectMapping # XXX really correct? # what if ``arg`` has side-effects? case arg.kind - of nkEmpty..nkNilLit: + of nkEmpty..nkNilLit: result = paDirectMapping - of nkPar, nkCurly, nkBracket: + of nkPar, nkCurly, nkBracket: result = paFastAsgn - for i in countup(0, sonsLen(arg) - 1): - if putArgInto(arg.sons[i], formal) != paDirectMapping: return + for i in countup(0, sonsLen(arg) - 1): + if putArgInto(arg.sons[i], formal) != paDirectMapping: return result = paDirectMapping - else: + else: if skipTypes(formal, abstractInst).kind == tyVar: result = paVarAsgn else: result = paFastAsgn - + proc findWrongOwners(c: PTransf, n: PNode) = if n.kind == nkVarSection: let x = n.sons[0].sons[0] if x.kind == nkSym and x.sym.owner != getCurrOwner(c): - internalError(x.info, "bah " & x.sym.name.s & " " & + internalError(x.info, "bah " & x.sym.name.s & " " & x.sym.owner.name.s & " " & getCurrOwner(c).name.s) else: for i in 0 .. = 3: + if op != nil and op.magic != mNone and n.len >= 3: result = newTransNode(nkCall, n, 0) add(result, transform(c, n.sons[0])) var j = 1 - while j < sonsLen(n): + while j < sonsLen(n): var a = transform(c, n.sons[j]).PNode inc(j) - if isConstExpr(a): + if isConstExpr(a): while (j < sonsLen(n)): let b = transform(c, n.sons[j]).PNode if not isConstExpr(b): break @@ -640,7 +640,7 @@ proc transformCall(c: PTransf, n: PNode): PTransNode = proc dontInlineConstant(orig, cnst: PNode): bool {.inline.} = # symbols that expand to a complex constant (array, etc.) should not be # inlined, unless it's the empty array: - result = orig.kind == nkSym and cnst.kind in {nkCurly, nkPar, nkBracket} and + result = orig.kind == nkSym and cnst.kind in {nkCurly, nkPar, nkBracket} and cnst.len != 0 proc commonOptimizations*(c: PSym, n: PNode): PNode = @@ -673,11 +673,11 @@ proc commonOptimizations*(c: PSym, n: PNode): PNode = else: result = n -proc transform(c: PTransf, n: PNode): PTransNode = +proc transform(c: PTransf, n: PNode): PTransNode = case n.kind - of nkSym: + of nkSym: result = transformSym(c, n) - of nkEmpty..pred(nkSym), succ(nkSym)..nkNilLit: + of nkEmpty..pred(nkSym), succ(nkSym)..nkNilLit: # nothing to be done for leaves: result = PTransNode(n) of nkBracketExpr: result = transformArrayAccess(c, n) @@ -702,7 +702,7 @@ proc transform(c: PTransf, n: PNode): PTransNode = n.sons[bodyPos] = PNode(transform(c, s.getBody)) if n.kind == nkMethodDef: methodDef(s, false) result = PTransNode(n) - of nkForStmt: + of nkForStmt: result = transformFor(c, n) of nkParForStmt: result = transformSons(c, n) @@ -713,14 +713,14 @@ proc transform(c: PTransf, n: PNode): PTransNode = add(result, PTransNode(newSymNode(labl))) of nkBreakStmt: result = transformBreak(c, n) of nkWhileStmt: result = transformWhile(c, n) - of nkCall, nkHiddenCallConv, nkCommand, nkInfix, nkPrefix, nkPostfix, - nkCallStrLit: + of nkCall, nkHiddenCallConv, nkCommand, nkInfix, nkPrefix, nkPostfix, + nkCallStrLit: result = transformCall(c, n) - of nkAddr, nkHiddenAddr: + of nkAddr, nkHiddenAddr: result = transformAddrDeref(c, n, nkDerefExpr, nkHiddenDeref) - of nkDerefExpr, nkHiddenDeref: + of nkDerefExpr, nkHiddenDeref: result = transformAddrDeref(c, n, nkAddr, nkHiddenAddr) - of nkHiddenStdConv, nkHiddenSubConv, nkConv: + of nkHiddenStdConv, nkHiddenSubConv, nkConv: result = transformConv(c, n) of nkDiscardStmt: result = PTransNode(n) @@ -730,7 +730,7 @@ proc transform(c: PTransf, n: PNode): PTransNode = # ensure that e.g. discard "some comment" gets optimized away # completely: result = PTransNode(newNode(nkCommentStmt)) - of nkCommentStmt, nkTemplateDef: + of nkCommentStmt, nkTemplateDef: return n.PTransNode of nkConstSection: # do not replace ``const c = 3`` with ``const 3 = 3`` @@ -744,10 +744,10 @@ proc transform(c: PTransf, n: PNode): PTransNode = result = transformVarSection(c, n) else: result = transformSons(c, n) - of nkYieldStmt: + of nkYieldStmt: if c.inlining > 0: result = transformYield(c, n) - else: + else: result = transformSons(c, n) of nkBlockStmt, nkBlockExpr: result = transformBlock(c, n) @@ -764,7 +764,7 @@ proc transform(c: PTransf, n: PNode): PTransNode = if cnst != nil and not dontInlineConstant(n, cnst): result = PTransNode(cnst) # do not miss an optimization -proc processTransf(c: PTransf, n: PNode, owner: PSym): PNode = +proc processTransf(c: PTransf, n: PNode, owner: PSym): PNode = # Note: For interactive mode we cannot call 'passes.skipCodegen' and skip # this step! We have to rely that the semantic pass transforms too errornous # nodes into an empty node. @@ -774,7 +774,7 @@ proc processTransf(c: PTransf, n: PNode, owner: PSym): PNode = popTransCon(c) incl(result.flags, nfTransf) -proc openTransf(module: PSym, filename: string): PTransf = +proc openTransf(module: PSym, filename: string): PTransf = new(result) result.contSyms = @[] result.breakSyms = @[] -- cgit 1.4.1-2-gfad0 =devel&id=d2c7d391c8b69a6a590a2f702ed58bea033f6325'>d2c7d391c ^ 
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