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#
#
# The Nim Compiler
# (c) Copyright 2012 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
# tree helper routines
import
ast, wordrecg, idents
proc cyclicTreeAux(n: PNode, visited: var seq[PNode]): bool =
result = false
if n == nil: return
for v in visited:
if v == n: return true
if not (n.kind in {nkEmpty..nkNilLit}):
visited.add(n)
for nSon in n.sons:
if cyclicTreeAux(nSon, visited): return true
discard visited.pop()
proc cyclicTree*(n: PNode): bool =
var visited: seq[PNode] = @[]
cyclicTreeAux(n, visited)
proc sameFloatIgnoreNan(a, b: BiggestFloat): bool {.inline.} =
## ignores NaN semantics, but ensures 0.0 == -0.0, see #13730
cast[uint64](a) == cast[uint64](b) or a == b
proc exprStructuralEquivalent*(a, b: PNode; strictSymEquality=false): bool =
if a == b:
result = true
elif (a != nil) and (b != nil) and (a.kind == b.kind):
case a.kind
of nkSym:
if strictSymEquality:
result = a.sym == b.sym
else:
# don't go nuts here: same symbol as string is enough:
result = a.sym.name.id == b.sym.name.id
of nkIdent: result = a.ident.id == b.ident.id
of nkCharLit..nkUInt64Lit: result = a.intVal == b.intVal
of nkFloatLit..nkFloat64Lit: result = sameFloatIgnoreNan(a.floatVal, b.floatVal)
of nkStrLit..nkTripleStrLit: result = a.strVal == b.strVal
of nkCommentStmt: result = a.comment == b.comment
of nkEmpty, nkNilLit, nkType: result = true
else:
if a.len == b.len:
for i in 0..<a.len:
if not exprStructuralEquivalent(a[i], b[i],
strictSymEquality): return
result = true
else:
result = false
else:
result = false
proc sameTree*(a, b: PNode): bool =
result = false
if a == b:
result = true
elif a != nil and b != nil and a.kind == b.kind:
if a.flags != b.flags: return
if a.info.line != b.info.line: return
if a.info.col != b.info.col:
return #if a.info.fileIndex <> b.info.fileIndex then exit;
case a.kind
of nkSym:
# don't go nuts here: same symbol as string is enough:
result = a.sym.name.id == b.sym.name.id
of nkIdent: result = a.ident.id == b.ident.id
of nkCharLit..nkUInt64Lit: result = a.intVal == b.intVal
of nkFloatLit..nkFloat64Lit: result = sameFloatIgnoreNan(a.floatVal, b.floatVal)
of nkStrLit..nkTripleStrLit: result = a.strVal == b.strVal
of nkEmpty, nkNilLit, nkType: result = true
else:
if a.len == b.len:
for i in 0..<a.len:
if not sameTree(a[i], b[i]): return
result = true
proc getMagic*(op: PNode): TMagic =
if op == nil: return mNone
case op.kind
of nkCallKinds:
case op[0].kind
of nkSym: result = op[0].sym.magic
else: result = mNone
else: result = mNone
proc isConstExpr*(n: PNode): bool =
const atomKinds = {nkCharLit..nkNilLit} # Char, Int, UInt, Str, Float and Nil literals
n.kind in atomKinds or nfAllConst in n.flags
proc isCaseObj*(n: PNode): bool =
result = false
if n.kind == nkRecCase: return true
for i in 0..<n.safeLen:
if n[i].isCaseObj: return true
proc isDeepConstExpr*(n: PNode; preventInheritance = false): bool =
case n.kind
of nkCharLit..nkNilLit:
result = true
of nkExprEqExpr, nkExprColonExpr, nkHiddenStdConv, nkHiddenSubConv:
result = isDeepConstExpr(n[1], preventInheritance)
of nkCurly, nkBracket, nkPar, nkTupleConstr, nkObjConstr, nkClosure, nkRange:
for i in ord(n.kind == nkObjConstr)..<n.len:
if not isDeepConstExpr(n[i], preventInheritance): return false
if n.typ.isNil: result = true
else:
let t = n.typ.skipTypes({tyGenericInst, tyDistinct, tyAlias, tySink, tyOwned})
if t.kind in {tyRef, tyPtr} or tfUnion in t.flags: return false
if t.kind == tyObject:
if preventInheritance and t.baseClass != nil:
result = false
elif isCaseObj(t.n):
result = false
else:
result = true
else:
result = true
else: result = false
proc isRange*(n: PNode): bool {.inline.} =
if n.kind in nkCallKinds:
let callee = n[0]
if (callee.kind == nkIdent and callee.ident.id == ord(wDotDot)) or
(callee.kind == nkSym and callee.sym.name.id == ord(wDotDot)) or
(callee.kind in {nkClosedSymChoice, nkOpenSymChoice} and
callee[1].sym.name.id == ord(wDotDot)):
result = true
else:
result = false
else:
result = false
proc whichPragma*(n: PNode): TSpecialWord =
let key = if n.kind in nkPragmaCallKinds and n.len > 0: n[0] else: n
case key.kind
of nkIdent: result = whichKeyword(key.ident)
of nkSym: result = whichKeyword(key.sym.name)
of nkCast: return wCast
of nkClosedSymChoice, nkOpenSymChoice:
return whichPragma(key[0])
else: return wInvalid
if result in nonPragmaWordsLow..nonPragmaWordsHigh:
result = wInvalid
proc isNoSideEffectPragma*(n: PNode): bool =
var k = whichPragma(n)
if k == wCast:
k = whichPragma(n[1])
result = k == wNoSideEffect
proc findPragma*(n: PNode, which: TSpecialWord): PNode =
result = nil
if n.kind == nkPragma:
for son in n:
if whichPragma(son) == which:
return son
proc effectSpec*(n: PNode, effectType: TSpecialWord): PNode =
result = nil
for i in 0..<n.len:
var it = n[i]
if it.kind == nkExprColonExpr and whichPragma(it) == effectType:
result = it[1]
if result.kind notin {nkCurly, nkBracket}:
result = newNodeI(nkCurly, result.info)
result.add(it[1])
return
proc propSpec*(n: PNode, effectType: TSpecialWord): PNode =
result = nil
for i in 0..<n.len:
var it = n[i]
if it.kind == nkExprColonExpr and whichPragma(it) == effectType:
return it[1]
proc unnestStmts(n, result: PNode) =
if n.kind == nkStmtList:
for x in items(n): unnestStmts(x, result)
elif n.kind notin {nkCommentStmt, nkNilLit}:
result.add(n)
proc flattenStmts*(n: PNode): PNode =
result = newNodeI(nkStmtList, n.info)
unnestStmts(n, result)
if result.len == 1:
result = result[0]
proc extractRange*(k: TNodeKind, n: PNode, a, b: int): PNode =
result = newNodeI(k, n.info, b-a+1)
for i in 0..b-a: result[i] = n[i+a]
proc getRoot*(n: PNode): PSym =
## ``getRoot`` takes a *path* ``n``. A path is an lvalue expression
## like ``obj.x[i].y``. The *root* of a path is the symbol that can be
## determined as the owner; ``obj`` in the example.
case n.kind
of nkSym:
if n.sym.kind in {skVar, skResult, skTemp, skLet, skForVar, skParam}:
result = n.sym
else:
result = nil
of nkDotExpr, nkBracketExpr, nkHiddenDeref, nkDerefExpr,
nkObjUpConv, nkObjDownConv, nkCheckedFieldExpr, nkHiddenAddr, nkAddr:
result = getRoot(n[0])
of nkHiddenStdConv, nkHiddenSubConv, nkConv:
result = getRoot(n[1])
of nkCallKinds:
if getMagic(n) == mSlice: result = getRoot(n[1])
else: result = nil
else: result = nil
proc stupidStmtListExpr*(n: PNode): bool =
for i in 0..<n.len-1:
if n[i].kind notin {nkEmpty, nkCommentStmt}: return false
result = true
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 = cnst.kind in {nkCurly, nkPar, nkTupleConstr, nkBracket, nkObjConstr} and
cnst.len > ord(cnst.kind == nkObjConstr)
proc isRunnableExamples*(n: PNode): bool =
# Templates and generics don't perform symbol lookups.
result = n.kind == nkSym and n.sym.magic == mRunnableExamples or
n.kind == nkIdent and n.ident.id == ord(wRunnableExamples)
proc skipAddr*(n: PNode): PNode {.inline.} =
result = if n.kind in {nkAddr, nkHiddenAddr}: n[0] else: n
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