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.forbids pragma: defining forbidden tags (#20050)

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* .forbids pragma: defining illegal effects for proc types

This patch intends to define the opposite of the .tags pragma: a way to define effects which are not allowed in a proc.

* updated documentation and changelogs for the forbids pragma

* renamed notTagEffects to forbiddenEffects

* corrected issues of forbids pragma

the forbids pragma didn't handle simple restrictions properly and it also had issues with subtyping

* removed incorrect character from changelog

* added test to cover the interaction of methods and the forbids pragma

* covering the interaction of the tags and forbids pragmas

* updated manual about the forbids pragma

* removed useless statement

* corrected the subtyping of proc types using the forbids pragma

* updated manual for the forbids pragma

* updated documentations for forbids pragma

* updated nim docs

* updated docs with rsttester.nim

* regenerated documentation

* updated rst docs

* Update changelog.md

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>

* updated changelog

* corrected typo

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>
This commit is contained in:
Lancer11211 2022-07-26 07:40:49 +02:00 • committed by GitHub
commit efd5c571bf
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24 changed files with 405 additions and 71 deletions
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12
compiler/pragmas.nim
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@ -32,7 +32,7 @@ const
wCompilerProc, wNonReloadable, wCore, wProcVar, wVarargs, wCompileTime, wMerge,
wBorrow, wImportCompilerProc, wThread,
wAsmNoStackFrame, wDiscardable, wNoInit, wCodegenDecl,
wGensym, wInject, wRaises, wEffectsOf, wTags, wLocks, wDelegator, wGcSafe,
wGensym, wInject, wRaises, wEffectsOf, wTags, wForbids, wLocks, wDelegator, wGcSafe,
wConstructor, wLiftLocals, wStackTrace, wLineTrace, wNoDestroy,
wRequires, wEnsures, wEnforceNoRaises}
converterPragmas* = procPragmas
@ -45,7 +45,7 @@ const
iteratorPragmas* = declPragmas + {FirstCallConv..LastCallConv, wNoSideEffect, wSideEffect,
wMagic, wBorrow,
wDiscardable, wGensym, wInject, wRaises, wEffectsOf,
wTags, wLocks, wGcSafe, wRequires, wEnsures}
wTags, wForbids, wLocks, wGcSafe, wRequires, wEnsures}
exprPragmas* = {wLine, wLocks, wNoRewrite, wGcSafe, wNoSideEffect}
stmtPragmas* = {
wHint, wWarning, wError,
@ -65,7 +65,7 @@ const
lambdaPragmas* = {FirstCallConv..LastCallConv,
wNoSideEffect, wSideEffect, wNoreturn, wNosinks, wDynlib, wHeader,
wThread, wAsmNoStackFrame,
wRaises, wLocks, wTags, wRequires, wEnsures, wEffectsOf,
wRaises, wLocks, wTags, wForbids, wRequires, wEnsures, wEffectsOf,
wGcSafe, wCodegenDecl, wNoInit, wCompileTime}
typePragmas* = declPragmas + {wMagic, wAcyclic,
wPure, wHeader, wCompilerProc, wCore, wFinal, wSize, wShallow,
@ -85,7 +85,7 @@ const
paramPragmas* = {wNoalias, wInject, wGensym}
letPragmas* = varPragmas
procTypePragmas* = {FirstCallConv..LastCallConv, wVarargs, wNoSideEffect,
wThread, wRaises, wEffectsOf, wLocks, wTags, wGcSafe,
wThread, wRaises, wEffectsOf, wLocks, wTags, wForbids, wGcSafe,
wRequires, wEnsures}
forVarPragmas* = {wInject, wGensym}
allRoutinePragmas* = methodPragmas + iteratorPragmas + lambdaPragmas
@ -820,7 +820,7 @@ proc singlePragma(c: PContext, sym: PSym, n: PNode, i: var int,
elif not isStatement:
localError(c.config, n.info, "'cast' pragma only allowed in a statement context")
case whichPragma(key[1])
of wRaises, wTags: pragmaRaisesOrTags(c, key[1])
of wRaises, wTags, wForbids: pragmaRaisesOrTags(c, key[1])
else: discard
return
elif key.kind notin nkIdentKinds:
@ -1184,7 +1184,7 @@ proc singlePragma(c: PContext, sym: PSym, n: PNode, i: var int,
noVal(c, it)
if sym == nil: invalidPragma(c, it)
of wLine: pragmaLine(c, it)
of wRaises, wTags: pragmaRaisesOrTags(c, it)
of wRaises, wTags, wForbids: pragmaRaisesOrTags(c, it)
of wLocks:
if sym == nil: pragmaLockStmt(c, it)
elif sym.typ == nil: invalidPragma(c, it)