basic continue after error works; interactive mode more useful

install.txt

@@ -37,7 +37,7 @@ Installation on the Macintosh
 
 Only MacOS X is supported.
 Since MacOS X is UNIX based too, it works like the installation on Linux. 
-However, for unknown reasons the symbolic link method does not work MacOS X. 
+However, for unknown reasons the symbolic link method does not work on MacOS X. 
 You need to install Apple's developer's tools for the GNU Compiler Collection.
 
 

lib/system.nim

@@ -747,7 +747,7 @@ proc compileOption*(option, arg: string): bool {.
   
 include "system/inclrtl"
 
-when not defined(ecmascript):
+when not defined(ecmascript) and not defined(nimrodVm):
   include "system/cgprocs"
 
 proc add *[T](x: var seq[T], y: T) {.magic: "AppendSeqElem", noSideEffect.}
@@ -1334,10 +1334,6 @@ proc quit*(errorcode: int = QuitSuccess) {.
   ## It does *not* call the garbage collector to free all the memory,
   ## unless a quit procedure calls ``GC_collect``.
 
-when not defined(EcmaScript) and not defined(NimrodVM): 
-  proc quit*(errormsg: string) {.noReturn.}
-    ## a shorthand for ``echo(errormsg); quit(quitFailure)``.
-
 when not defined(EcmaScript) and not defined(NimrodVM):
 
   proc atomicInc*(memLoc: var int, x: int): int {.inline.}
@@ -1558,10 +1554,6 @@ when not defined(EcmaScript) and not defined(NimrodVM):
     ## returns the OS file handle of the file ``f``. This is only useful for
     ## platform specific programming.
 
-  proc quit(errormsg: string) =
-    echo(errormsg)
-    quit(quitFailure)
-
   proc cstringArrayToSeq*(a: cstringArray, len: int): seq[string] =
     ## converts a ``cstringArray`` to a ``seq[string]``. `a` is supposed to be
     ## of length ``len``.
@@ -1669,5 +1661,10 @@ elif defined(ecmaScript) or defined(NimrodVM):
       if x < y: return -1
       return 1
 
+proc quit*(errormsg: string) {.noReturn.} =
+  ## a shorthand for ``echo(errormsg); quit(quitFailure)``.
+  echo(errormsg)
+  quit(quitFailure)
+
 {.pop.} # checks
 {.pop.} # hints

lib/system/mmdisp.nim

@@ -56,7 +56,9 @@ var
   gOutOfMem: ref EOutOfMemory
 
 proc raiseOutOfMem() {.noreturn.} =
-  if gOutOfMem == nil: quit("out of memory; cannot even throw an exception")
+  if gOutOfMem == nil: 
+    echo("out of memory; cannot even throw an exception")
+    quit(1)
   gOutOfMem.msg = "out of memory"
   raise gOutOfMem
 

rod/evals.nim

@@ -78,8 +78,9 @@ proc evalAux(c: PEvalContext, n: PNode, flags: TEvalFlags): PNode
 proc stackTraceAux(x: PStackFrame) =
   if x != nil:
     stackTraceAux(x.next)
+    var info = if x.call != nil: x.call.info else: UnknownLineInfo()
     messageOut(`%`("file: $1, line: $2", 
-                   [toFilename(x.call.info), $(toLineNumber(x.call.info))]))
+                   [toFilename(info), $(toLineNumber(info))]))
 
 proc stackTrace(c: PEvalContext, n: PNode, msg: TMsgKind, arg: string = "") = 
   messageOut("stack trace: (most recent call last)")

rod/llstream.nim

@@ -23,6 +23,7 @@ type
     f*: tfile
     s*: string
     rd*, wr*: int             # for string streams
+    lineOffset*: int          # for fake stdin line numbers
   
   PLLStream* = ref TLLStream
 
@@ -65,6 +66,7 @@ proc LLStreamOpenStdIn(): PLLStream =
   new(result)
   result.kind = llsStdIn
   result.s = ""
+  result.lineOffset = -1
 
 proc LLStreamClose(s: PLLStream) = 
   case s.kind
@@ -86,6 +88,7 @@ proc LLreadFromStdin(s: PLLStream, buf: pointer, bufLen: int): int =
     add(s.s, line)
     add(s.s, "\n")
     if (L > 0) and (line[L - 1 + 0] == '#'): break
+  inc(s.lineOffset)
   result = min(bufLen, len(s.s) - s.rd)
   if result > 0: 
     copyMem(buf, addr(s.s[0 + s.rd]), result)

rod/main.nim

@@ -139,6 +139,7 @@ proc CommandCompileToEcmaScript(filename: string) =
   compileProject(filename)
 
 proc CommandInteractive() = 
+  msgs.gErrorMax = high(int)  # do not stop after first error
   incl(gGlobalOptions, optSafeCode)
   setTarget(osNimrodVM, cpuNimrodVM)
   initDefines()

rod/msgs.nim

@@ -373,6 +373,8 @@ type
     
   ERecoverableError* = object of EInvalidValue
 
+proc raiseRecoverableError*() {.noinline, noreturn.} =
+  raise newException(ERecoverableError, "")
 
 var
   gNotes*: TNoteKinds = {low(TNoteKind)..high(TNoteKind)}
@@ -485,7 +487,7 @@ proc handleError(msg: TMsgKind, eh: TErrorHandling) =
       if gVerbosity >= 3: assert(false)
       quit(1)                 # one error stops the compiler
     elif eh == doRaise:
-      raise newException(ERecoverableError, "")
+      raiseRecoverableError()
   
 proc sameLineInfo(a, b: TLineInfo): bool = 
   result = (a.line == b.line) and (a.fileIndex == b.fileIndex)
@@ -518,36 +520,39 @@ proc rawMessage*(msg: TMsgKind, args: openarray[string]) =
     if not (msg in gNotes): return 
     frmt = rawHintFormat
     inc(gHintCounter)
-  else: 
-    assert(false)             # cannot happen
   MessageOut(`%`(frmt, `%`(msgKindToString(msg), args)))
   handleError(msg, doAbort)
 
 proc rawMessage*(msg: TMsgKind, arg: string) = 
   rawMessage(msg, [arg])
 
+var
+  lastError = UnknownLineInfo()
+
 proc liMessage(info: TLineInfo, msg: TMsgKind, arg: string, 
                eh: TErrorHandling) = 
   var frmt: string
+  var ignoreMsg = false
   case msg
   of errMin..errMax: 
     writeContext(info)
     frmt = posErrorFormat
+    # we try to filter error messages so that not two error message
+    # in the same file and line are produced:
+    ignoreMsg = sameLineInfo(lastError, info)
+    lastError = info
   of warnMin..warnMax: 
-    if not (optWarns in gOptions): return 
+    ignoreMsg = optWarns notin gOptions or msg notin gNotes
-    if not (msg in gNotes): return 
     frmt = posWarningFormat
     inc(gWarnCounter)
   of hintMin..hintMax: 
-    if not (optHints in gOptions): return 
+    ignoreMsg = optHints notin gOptions or msg notin gNotes
-    if not (msg in gNotes): return 
     frmt = posHintFormat
     inc(gHintCounter)
-  else: 
+  if not ignoreMsg:
-    assert(false)             # cannot happen
+    MessageOut(frmt % [toFilename(info), coordToStr(info.line),
-  MessageOut(`%`(frmt, [toFilename(info), coordToStr(info.line), 
+                       coordToStr(info.col), getMessageStr(msg, arg)])
-                        coordToStr(info.col), getMessageStr(msg, arg)]))
+  handleError(msg, eh)
-  handleError(msg, doAbort)
   
 proc Fatal*(info: TLineInfo, msg: TMsgKind, arg = "") = 
   liMessage(info, msg, arg, doAbort)

rod/nimrod.nim

@@ -68,10 +68,11 @@ proc HandleCmdLine() =
     ProcessCmdLine(passCmd2, command, filename)
     MainCommand(command, filename)
     if gVerbosity >= 2: echo(GC_getStatistics())
+    if msgs.gErrorCounter == 0:
       when hasTinyCBackend:
         if gCmd == cmdRun:
           tccgen.run()
-    if gCmd notin {cmdInterpret, cmdRun} and msgs.gErrorCounter == 0: 
+      if gCmd notin {cmdInterpret, cmdRun}: 
         rawMessage(hintSuccessX, [$gLinesCompiled, $(getTime() - start)])
       if optRun in gGlobalOptions: 
         when defined(unix): 

rod/scanner.nim

@@ -211,6 +211,7 @@ proc openLexer(lex: var TLexer, filename: string, inputstream: PLLStream) =
   lex.indentStack = @[0]
   lex.filename = filename
   lex.indentAhead = - 1
+  inc(lex.Linenumber, inputstream.lineOffset) 
 
 proc closeLexer(lex: var TLexer) = 
   inc(gLinesCompiled, lex.LineNumber)

rod/semexprs.nim

@@ -21,9 +21,12 @@ proc semTemplateExpr(c: PContext, n: PNode, s: PSym,
   popInfoContext()
 
 proc semFieldAccess(c: PContext, n: PNode, flags: TExprFlags = {}): PNode
+
 proc semExprWithType(c: PContext, n: PNode, flags: TExprFlags = {}): PNode = 
   result = semExpr(c, n, flags)
-  if result.kind == nkEmpty: InternalError("semExprWithType")
+  if result.kind == nkEmpty: 
+    # do not produce another redundant error message:
+    raiseRecoverableError()
   if result.typ != nil: 
     if result.typ.kind == tyVar: 
       var d = newNodeIT(nkHiddenDeref, result.info, result.typ.sons[0])

rod/semstmts.nim

@@ -276,6 +276,8 @@ proc semVar(c: PContext, n: PNode): PNode =
       else: typ = def.typ
     else: 
       def = ast.emptyNode
+    # this can only happen for errornous var statements:
+    if typ == nil: continue
     if not typeAllowed(typ, skVar): 
       GlobalError(a.info, errXisNoType, typeToString(typ))
     var tup = skipTypes(typ, {tyGenericInst})

rod/transf.nim

@@ -723,7 +723,9 @@ proc transform(c: PTransf, n: PNode): PTransNode =
     result = PTransNode(cnst) # do not miss an optimization
  
 proc processTransf(context: PPassContext, n: PNode): PNode = 
-  if passes.skipCodegen(n): return n
+  # Note: For interactive mode we cannot call 'passes.skipCodegen' and skip
+  # this step! We have to rely that the semantic pass transforms too errornous
+  # nodes into an empty node.
   var c = PTransf(context)
   pushTransCon(c, newTransCon(getCurrOwner(c)))
   result = PNode(transform(c, n))