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#
#
# The Nim Compiler
# (c) Copyright 2013 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## Generates traversal procs for the C backend.
# included from cgen.nim
type
TTraversalClosure = object
p: BProc
visitorFrmt: string
const
visitorFrmt = "#nimGCvisit((void*)$1, $2);$n"
proc genTraverseProc(c: TTraversalClosure, accessor: Rope, typ: PType)
proc genCaseRange(p: BProc, branch: PNode)
proc getTemp(p: BProc, t: PType, needsInit=false): TLoc
proc genTraverseProc(c: TTraversalClosure, accessor: Rope, n: PNode;
typ: PType) =
if n == nil: return
case n.kind
of nkRecList:
for i in 0..<n.len:
genTraverseProc(c, accessor, n[i], typ)
of nkRecCase:
if (n[0].kind != nkSym): internalError(c.p.config, n.info, "genTraverseProc")
var p = c.p
let disc = n[0].sym
if disc.loc.snippet == "": fillObjectFields(c.p.module, typ)
if disc.loc.t == nil:
internalError(c.p.config, n.info, "genTraverseProc()")
lineF(p, cpsStmts, "switch ($1.$2) {$n", [accessor, disc.loc.snippet])
for i in 1..<n.len:
let branch = n[i]
assert branch.kind in {nkOfBranch, nkElse}
if branch.kind == nkOfBranch:
genCaseRange(c.p, branch)
else:
lineF(p, cpsStmts, "default:$n", [])
genTraverseProc(c, accessor, lastSon(branch), typ)
lineF(p, cpsStmts, "break;$n", [])
lineF(p, cpsStmts, "} $n", [])
of nkSym:
let field = n.sym
if field.typ.kind == tyVoid: return
if field.loc.snippet == "": fillObjectFields(c.p.module, typ)
if field.loc.t == nil:
internalError(c.p.config, n.info, "genTraverseProc()")
genTraverseProc(c, "$1.$2" % [accessor, field.loc.snippet], field.loc.t)
else: internalError(c.p.config, n.info, "genTraverseProc()")
proc parentObj(accessor: Rope; m: BModule): Rope {.inline.} =
if not m.compileToCpp:
result = "$1.Sup" % [accessor]
else:
result = accessor
proc genTraverseProcSeq(c: TTraversalClosure, accessor: Rope, typ: PType)
proc genTraverseProc(c: TTraversalClosure, accessor: Rope, typ: PType) =
if typ == nil: return
var p = c.p
case typ.kind
of tyGenericInst, tyGenericBody, tyTypeDesc, tyAlias, tyDistinct, tyInferred,
tySink, tyOwned:
genTraverseProc(c, accessor, skipModifier(typ))
of tyArray:
let arraySize = lengthOrd(c.p.config, typ.indexType)
var i: TLoc = getTemp(p, getSysType(c.p.module.g.graph, unknownLineInfo, tyInt))
var oldCode = p.s(cpsStmts)
freeze oldCode
linefmt(p, cpsStmts, "for ($1 = 0; $1 < $2; $1++) {$n",
[i.snippet, arraySize])
let oldLen = p.s(cpsStmts).len
genTraverseProc(c, ropecg(c.p.module, "$1[$2]", [accessor, i.snippet]), typ.elementType)
if p.s(cpsStmts).len == oldLen:
# do not emit dummy long loops for faster debug builds:
p.s(cpsStmts) = oldCode
else:
lineF(p, cpsStmts, "}$n", [])
of tyObject:
var x = typ.baseClass
if x != nil: x = x.skipTypes(skipPtrs)
genTraverseProc(c, accessor.parentObj(c.p.module), x)
if typ.n != nil: genTraverseProc(c, accessor, typ.n, typ)
of tyTuple:
let typ = getUniqueType(typ)
for i, a in typ.ikids:
genTraverseProc(c, ropecg(c.p.module, "$1.Field$2", [accessor, i]), a)
of tyRef:
lineCg(p, cpsStmts, visitorFrmt, [accessor, c.visitorFrmt])
of tySequence:
if optSeqDestructors notin c.p.module.config.globalOptions:
lineCg(p, cpsStmts, visitorFrmt, [accessor, c.visitorFrmt])
elif containsGarbageCollectedRef(typ.elementType):
# destructor based seqs are themselves not traced but their data is, if
# they contain a GC'ed type:
lineCg(p, cpsStmts, "#nimGCvisitSeq((void*)$1, $2);$n", [accessor, c.visitorFrmt])
#genTraverseProcSeq(c, accessor, typ)
of tyString:
if tfHasAsgn notin typ.flags:
lineCg(p, cpsStmts, visitorFrmt, [accessor, c.visitorFrmt])
of tyProc:
if typ.callConv == ccClosure:
lineCg(p, cpsStmts, visitorFrmt, [ropecg(c.p.module, "$1.ClE_0", [accessor]), c.visitorFrmt])
else:
discard
proc genTraverseProcSeq(c: TTraversalClosure, accessor: Rope, typ: PType) =
var p = c.p
assert typ.kind == tySequence
var i = getTemp(p, getSysType(c.p.module.g.graph, unknownLineInfo, tyInt))
var oldCode = p.s(cpsStmts)
freeze oldCode
var a = TLoc(snippet: accessor)
lineF(p, cpsStmts, "for ($1 = 0; $1 < $2; $1++) {$n",
[i.snippet, lenExpr(c.p, a)])
let oldLen = p.s(cpsStmts).len
genTraverseProc(c, "$1$3[$2]" % [accessor, i.snippet, dataField(c.p)], typ.elementType)
if p.s(cpsStmts).len == oldLen:
# do not emit dummy long loops for faster debug builds:
p.s(cpsStmts) = oldCode
else:
lineF(p, cpsStmts, "}$n", [])
proc genTraverseProc(m: BModule, origTyp: PType; sig: SigHash): Rope =
var p = newProc(nil, m)
result = "Marker_" & getTypeName(m, origTyp, sig)
let
hcrOn = m.hcrOn
typ = origTyp.skipTypes(abstractInstOwned)
markerName = if hcrOn: result & "_actual" else: result
header = "static N_NIMCALL(void, $1)(void* p, NI op)" % [markerName]
t = getTypeDesc(m, typ)
lineF(p, cpsLocals, "$1 a;$n", [t])
lineF(p, cpsInit, "a = ($1)p;$n", [t])
var c = TTraversalClosure(p: p,
visitorFrmt: "op" # "#nimGCvisit((void*)$1, op);$n"
)
assert typ.kind != tyTypeDesc
if typ.kind == tySequence:
genTraverseProcSeq(c, "a".rope, typ)
else:
if skipTypes(typ.elementType, typedescInst+{tyOwned}).kind == tyArray:
# C's arrays are broken beyond repair:
genTraverseProc(c, "a".rope, typ.elementType)
else:
genTraverseProc(c, "(*a)".rope, typ.elementType)
let generatedProc = "$1 {$n$2$3$4}\n" %
[header, p.s(cpsLocals), p.s(cpsInit), p.s(cpsStmts)]
m.s[cfsProcHeaders].addf("$1;\n", [header])
m.s[cfsProcs].add(generatedProc)
if hcrOn:
m.s[cfsProcHeaders].addf("N_NIMCALL_PTR(void, $1)(void*, NI);\n", [result])
m.s[cfsDynLibInit].addf("\t$1 = (N_NIMCALL_PTR(void, )(void*, NI)) hcrRegisterProc($3, \"$1\", (void*)$2);\n",
[result, markerName, getModuleDllPath(m)])
proc genTraverseProcForGlobal(m: BModule, s: PSym; info: TLineInfo): Rope =
discard genTypeInfoV1(m, s.loc.t, info)
var p = newProc(nil, m)
var sLoc = rdLoc(s.loc)
result = getTempName(m)
if sfThread in s.flags and emulatedThreadVars(m.config):
accessThreadLocalVar(p, s)
sLoc = "NimTV_->" & sLoc
var c = TTraversalClosure(p: p,
visitorFrmt: "0" # "#nimGCvisit((void*)$1, 0);$n"
)
let header = "static N_NIMCALL(void, $1)(void)" % [result]
genTraverseProc(c, sLoc, s.loc.t)
let generatedProc = "$1 {$n$2$3$4}$n" %
[header, p.s(cpsLocals), p.s(cpsInit), p.s(cpsStmts)]
m.s[cfsProcHeaders].addf("$1;$n", [header])
m.s[cfsProcs].add(generatedProc)
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