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added a warning for when result is shadowed #868

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Simon Hafner 2015-02-01 05:28:35 -06:00
commit a1d813d12c
2 changed files with 6 additions and 1 deletions
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4
compiler/msgs.nim
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@ -117,7 +117,8 @@ type
warnDifferentHeaps, warnWriteToForeignHeap, warnUnsafeCode, warnDifferentHeaps, warnWriteToForeignHeap, warnUnsafeCode,
warnEachIdentIsTuple, warnShadowIdent, warnEachIdentIsTuple, warnShadowIdent,
warnProveInit, warnProveField, warnProveIndex, warnGcUnsafe, warnGcUnsafe2, warnProveInit, warnProveField, warnProveIndex, warnGcUnsafe, warnGcUnsafe2,
warnUninit, warnGcMem, warnDestructor, warnLockLevel, warnUser, warnUninit, warnGcMem, warnDestructor, warnLockLevel, warnResultShadowed,
warnUser,
hintSuccess, hintSuccessX, hintSuccess, hintSuccessX,
hintLineTooLong, hintXDeclaredButNotUsed, hintConvToBaseNotNeeded, hintLineTooLong, hintXDeclaredButNotUsed, hintConvToBaseNotNeeded,
hintConvFromXtoItselfNotNeeded, hintExprAlwaysX, hintQuitCalled, hintConvFromXtoItselfNotNeeded, hintExprAlwaysX, hintQuitCalled,
@ -391,6 +392,7 @@ const
warnGcMem: "'$1' uses GC'ed memory [GcMem]", warnGcMem: "'$1' uses GC'ed memory [GcMem]",
warnDestructor: "usage of a type with a destructor in a non destructible context. This will become a compile time error in the future. [Destructor]", warnDestructor: "usage of a type with a destructor in a non destructible context. This will become a compile time error in the future. [Destructor]",
warnLockLevel: "$1 [LockLevel]", warnLockLevel: "$1 [LockLevel]",
warnResultShadowed: "Special variable 'result' is shadowed. [ResultShadowed]",
warnUser: "$1 [User]", warnUser: "$1 [User]",
hintSuccess: "operation successful [Success]", hintSuccess: "operation successful [Success]",
hintSuccessX: "operation successful ($# lines compiled; $# sec total; $#) [SuccessX]", hintSuccessX: "operation successful ($# lines compiled; $# sec total; $#) [SuccessX]",

3
compiler/semstmts.nim
View file

@ -396,6 +396,7 @@ proc semVarOrLet(c: PContext, n: PNode, symkind: TSymKind): PNode =
elif tup.kind == tyTuple and def.kind == nkPar and elif tup.kind == tyTuple and def.kind == nkPar and
a.kind == nkIdentDefs and a.len > 3: a.kind == nkIdentDefs and a.len > 3:
message(a.info, warnEachIdentIsTuple) message(a.info, warnEachIdentIsTuple)
for j in countup(0, length-3): for j in countup(0, length-3):
var v = semIdentDef(c, a.sons[j], symkind) var v = semIdentDef(c, a.sons[j], symkind)
if sfGenSym notin v.flags: addInterfaceDecl(c, v) if sfGenSym notin v.flags: addInterfaceDecl(c, v)
@ -405,6 +406,8 @@ proc semVarOrLet(c: PContext, n: PNode, symkind: TSymKind): PNode =
let shadowed = findShadowedVar(c, v) let shadowed = findShadowedVar(c, v)
if shadowed != nil: if shadowed != nil:
shadowed.flags.incl(sfShadowed) shadowed.flags.incl(sfShadowed)
if shadowed.kind == skResult:
message(a.info, warnResultShadowed)
# a shadowed variable is an error unless it appears on the right # a shadowed variable is an error unless it appears on the right
# side of the '=': # side of the '=':
if warnShadowIdent in gNotes and not identWithin(def, v.name): if warnShadowIdent in gNotes and not identWithin(def, v.name):