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#
#
# The Nimrod 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. Traversal procs are only an
## optimization; the GC works without them too.
# included from cgen.nim
type
TTraversalClosure = object
p: BProc
visitorFrmt: string
proc genTraverseProc(c: var TTraversalClosure, accessor: PRope, typ: PType)
proc genCaseRange(p: BProc, branch: PNode)
proc getTemp(p: BProc, t: PType, result: var TLoc)
proc genTraverseProc(c: var TTraversalClosure, accessor: PRope, n: PNode) =
if n == nil: return
case n.kind
of nkRecList:
for i in countup(0, sonsLen(n) - 1):
genTraverseProc(c, accessor, n.sons[i])
of nkRecCase:
if (n.sons[0].kind != nkSym): internalError(n.info, "genTraverseProc")
var p = c.p
let disc = n.sons[0].sym
lineF(p, cpsStmts, "switch ($1.$2) {$n", accessor, disc.loc.r)
for i in countup(1, sonsLen(n) - 1):
let branch = n.sons[i]
assert branch.kind in {nkOfBranch, nkElse}
if branch.kind == nkOfBranch:
genCaseRange(c.p, branch)
else:
lineF(p, cpsStmts, "default:$n")
genTraverseProc(c, accessor, lastSon(branch))
lineF(p, cpsStmts, "break;$n")
lineF(p, cpsStmts, "} $n")
of nkSym:
let field = n.sym
if field.loc.t == nil:
internalError(n.info, "genTraverseProc()")
genTraverseProc(c, ropef("$1.$2", accessor, field.loc.r), field.loc.t)
else: internalError(n.info, "genTraverseProc()")
proc parentObj(accessor: PRope): PRope {.inline.} =
if gCmd != cmdCompileToCpp:
result = ropef("$1.Sup", accessor)
else:
result = accessor
proc genTraverseProc(c: var TTraversalClosure, accessor: PRope, typ: PType) =
if typ == nil: return
var p = c.p
case typ.kind
of tyGenericInst, tyGenericBody, tyTypeDesc:
genTraverseProc(c, accessor, lastSon(typ))
of tyArrayConstr, tyArray:
let arraySize = lengthOrd(typ.sons[0])
var i: TLoc
getTemp(p, getSysType(tyInt), i)
linefmt(p, cpsStmts, "for ($1 = 0; $1 < $2; $1++) {$n",
i.r, arraySize.toRope)
genTraverseProc(c, rfmt(nil, "$1[$2]", accessor, i.r), typ.sons[1])
lineF(p, cpsStmts, "}$n")
of tyObject:
for i in countup(0, sonsLen(typ) - 1):
genTraverseProc(c, accessor.parentObj, typ.sons[i])
if typ.n != nil: genTraverseProc(c, accessor, typ.n)
of tyTuple:
let typ = getUniqueType(typ)
for i in countup(0, sonsLen(typ) - 1):
genTraverseProc(c, rfmt(nil, "$1.Field$2", accessor, i.toRope), typ.sons[i])
of tyRef, tyString, tySequence:
lineCg(p, cpsStmts, c.visitorFrmt, accessor)
of tyProc:
if typ.callConv == ccClosure:
lineCg(p, cpsStmts, c.visitorFrmt, rfmt(nil, "$1.ClEnv", accessor))
else:
discard
proc genTraverseProcSeq(c: var TTraversalClosure, accessor: PRope, typ: PType) =
var p = c.p
assert typ.kind == tySequence
var i: TLoc
getTemp(p, getSysType(tyInt), i)
lineF(p, cpsStmts, "for ($1 = 0; $1 < $2->$3; $1++) {$n",
i.r, accessor, toRope(if gCmd != cmdCompileToCpp: "Sup.len" else: "len"))
genTraverseProc(c, ropef("$1->data[$2]", accessor, i.r), typ.sons[0])
lineF(p, cpsStmts, "}$n")
proc genTraverseProc(m: BModule, typ: PType, reason: TTypeInfoReason): PRope =
var c: TTraversalClosure
var p = newProc(nil, m)
result = getGlobalTempName()
case reason
of tiNew: c.visitorFrmt = "#nimGCvisit((void*)$1, op);$n"
else: assert false
let header = ropef("N_NIMCALL(void, $1)(void* p, NI op)", result)
let t = getTypeDesc(m, typ)
lineF(p, cpsLocals, "$1 a;$n", t)
lineF(p, cpsInit, "a = ($1)p;$n", t)
c.p = p
assert typ.kind != tyTypeDesc
if typ.kind == tySequence:
genTraverseProcSeq(c, "a".toRope, typ)
else:
if skipTypes(typ.sons[0], typedescInst).kind in {tyArrayConstr, tyArray}:
# C's arrays are broken beyond repair:
genTraverseProc(c, "a".toRope, typ.sons[0])
else:
genTraverseProc(c, "(*a)".toRope, typ.sons[0])
let generatedProc = ropef("$1 {$n$2$3$4}$n",
[header, p.s(cpsLocals), p.s(cpsInit), p.s(cpsStmts)])
m.s[cfsProcHeaders].appf("$1;$n", header)
m.s[cfsProcs].app(generatedProc)
proc genTraverseProcForGlobal(m: BModule, s: PSym): PRope =
discard genTypeInfo(m, s.loc.t)
var c: TTraversalClosure
var p = newProc(nil, m)
var sLoc = s.loc.r
result = getGlobalTempName()
if sfThread in s.flags and emulatedThreadVars():
accessThreadLocalVar(p, s)
sLoc = con("NimTV->", sLoc)
c.visitorFrmt = "#nimGCvisit((void*)$1, 0);$n"
c.p = p
let header = ropef("N_NIMCALL(void, $1)()", result)
genTraverseProc(c, sLoc, s.loc.t)
let generatedProc = ropef("$1 {$n$2$3$4}$n",
[header, p.s(cpsLocals), p.s(cpsInit), p.s(cpsStmts)])
m.s[cfsProcHeaders].appf("$1;$n", header)
m.s[cfsProcs].app(generatedProc)
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