[error messages, stacktraces] fix #8794 #9270 #9767 #9768 (#9766)

* fixes #8794 : `Error: undeclared field: 'foo'` should show type (+ where type is defined) (hard to guess in generic code)

* fixes #9270: `--listFullPaths` not honored by `declared in foo.nim` messages

* fixes #9767: VM stacktrace doesn't honor --excessiveStackTrace:on

* fixes #9768: VM stacktrace misses column info, can lead to ambiguous or harder to read stacktraces

* refactors some col+1 code to col + ColOffset (self documents code)

* make getProcHeader show declared info location also for types and all routine kinds (including macros,templates) instead of just (rather arbitrarily) for iterator,proc,func,method

* --listFullPaths now is honored in more places

* fix typo system/except.nim => lib/system/excpt.nim

* remove substr(foo, 0) hack in compiler/vm.nim which seems old and not applicable anymore

compiler/lookups.nim

@@ -150,7 +150,7 @@ type
 
 proc getSymRepr*(conf: ConfigRef; s: PSym): string =
   case s.kind
-  of skProc, skFunc, skMethod, skConverter, skIterator:
+  of routineKinds, skType:
     result = getProcHeader(conf, s)
   else:
     result = s.name.s

compiler/msgs.nim

@@ -135,6 +135,10 @@ const
   WarningColor = fgYellow
   HintTitle    = "Hint: "
   HintColor    = fgGreen
+  # NOTE: currently line info line numbers start with 1,
+  # but column numbers start with 0, however most editors expect
+  # first column to be 1, so we need to +1 here
+  ColOffset*   = 1
 
 proc getInfoContextLen*(conf: ConfigRef): int = return conf.m.msgContext.len
 proc setInfoContextLen*(conf: ConfigRef; L: int) = setLen(conf.m.msgContext, L)
@@ -155,7 +159,10 @@ template toFilename*(conf: ConfigRef; fileIdx: FileIndex): string =
   if fileIdx.int32 < 0 or conf == nil:
     "???"
   else:
-    conf.m.fileInfos[fileIdx.int32].projPath.string
+    if optListFullPaths in conf.globalOptions:
+      conf.m.fileInfos[fileIdx.int32].fullPath.string
+    else:
+      conf.m.fileInfos[fileIdx.int32].projPath.string
 
 proc toFullPath*(conf: ConfigRef; fileIdx: FileIndex): string =
   if fileIdx.int32 < 0 or conf == nil: result = "???"
@@ -192,10 +199,10 @@ proc toMsgFilename*(conf: ConfigRef; info: TLineInfo): string =
     result = "???"
     return
   let absPath = conf.m.fileInfos[info.fileIndex.int32].fullPath.string
-  let relPath = conf.m.fileInfos[info.fileIndex.int32].projPath.string
   if optListFullPaths in conf.globalOptions:
     result = absPath
   else:
+    let relPath = conf.m.fileInfos[info.fileIndex.int32].projPath.string
     result = if absPath.len < relPath.len: absPath else: relPath
 
 proc toLinenumber*(info: TLineInfo): int {.inline.} =
@@ -208,7 +215,9 @@ proc toFileLine*(conf: ConfigRef; info: TLineInfo): string {.inline.} =
   result = toFilename(conf, info) & ":" & $info.line
 
 proc toFileLineCol*(conf: ConfigRef; info: TLineInfo): string {.inline.} =
-  result = toFilename(conf, info) & "(" & $info.line & ", " & $(info.col+1) & ")"
+  # consider calling `helpers.lineInfoToString` instead
+  result = toFilename(conf, info) & "(" & $info.line & ", " &
+    $(info.col + ColOffset) & ")"
 
 proc `$`*(conf: ConfigRef; info: TLineInfo): string = toFileLineCol(conf, info)
 
@@ -359,7 +368,7 @@ proc writeContext(conf: ConfigRef; lastinfo: TLineInfo) =
         styledMsgWriteln(styleBright,
                          PosFormat % [toMsgFilename(conf, context.info),
                                       coordToStr(context.info.line.int),
-                                      coordToStr(context.info.col+1)],
+                                      coordToStr(context.info.col+ColOffset)],
                          resetStyle,
                          message)
     info = context.info
@@ -446,7 +455,7 @@ proc formatMsg*(conf: ConfigRef; info: TLineInfo, msg: TMsgKind, arg: string): s
               of hintMin..hintMax: HintTitle
               else: ErrorTitle
   result = PosFormat % [toMsgFilename(conf, info), coordToStr(info.line.int),
-                        coordToStr(info.col+1)] &
+                        coordToStr(info.col+ColOffset)] &
            title &
            getMessageStr(msg, arg)
 
@@ -483,11 +492,8 @@ proc liMessage(conf: ConfigRef; info: TLineInfo, msg: TMsgKind, arg: string,
     color = HintColor
     if msg != hintUserRaw: kind = HintsToStr[ord(msg) - ord(hintMin)]
     inc(conf.hintCounter)
-  # NOTE: currently line info line numbers start with 1,
-  # but column numbers start with 0, however most editors expect
-  # first column to be 1, so we need to +1 here
   let x = PosFormat % [toMsgFilename(conf, info), coordToStr(info.line.int),
-                       coordToStr(info.col+1)]
+                       coordToStr(info.col+ColOffset)]
   let s = getMessageStr(msg, arg)
 
   if not ignoreMsg:

compiler/options.nim

@@ -78,7 +78,7 @@ type                          # please make sure we have under 32 options
     optShowAllMismatches      # show all overloading resolution candidates
     optWholeProject           # for 'doc2': output any dependency
     optMixedMode              # true if some module triggered C++ codegen
-    optListFullPaths
+    optListFullPaths          # use full paths in toMsgFilename, toFilename
     optNoNimblePath
     optDynlibOverrideAll
 

compiler/semcall.nim

@@ -287,7 +287,20 @@ proc getMsgDiagnostic(c: PContext, flags: TExprFlags, n, f: PNode): string =
 
   let ident = considerQuotedIdent(c, f, n).s
   if nfDotField in n.flags and nfExplicitCall notin n.flags:
-    result = errUndeclaredField % ident & result
+    let sym = n.sons[1].typ.sym
+    var typeHint = ""
+    if sym == nil:
+      #[
+      Perhaps we're in a `compiles(foo.bar)` expression, or
+      in a concept, eg:
+        ExplainedConcept {.explain.} = concept o
+          o.foo is int
+      We coudl use: `(c.config $ n.sons[1].info)` to get more context.
+      ]#
+      discard
+    else:
+      typeHint = " for type " & getProcHeader(c.config, sym)
+    result = errUndeclaredField % ident & typeHint & " " & result
   else:
     if result.len == 0: result = errUndeclaredRoutine % ident
     else: result = errBadRoutine % [ident, result]

compiler/types.nim

@@ -107,20 +107,23 @@ proc isFloatLit*(t: PType): bool {.inline.} =
   result = t.kind == tyFloat and t.n != nil and t.n.kind == nkFloatLit
 
 proc getProcHeader*(conf: ConfigRef; sym: PSym; prefer: TPreferedDesc = preferName): string =
-  result = sym.owner.name.s & '.' & sym.name.s & '('
+  assert sym != nil
-  var n = sym.typ.n
+  result = sym.owner.name.s & '.' & sym.name.s
-  for i in countup(1, sonsLen(n) - 1):
+  if sym.kind in routineKinds:
-    let p = n.sons[i]
+    result.add '('
-    if p.kind == nkSym:
+    var n = sym.typ.n
-      add(result, p.sym.name.s)
+    for i in countup(1, sonsLen(n) - 1):
-      add(result, ": ")
+      let p = n.sons[i]
-      add(result, typeToString(p.sym.typ, prefer))
+      if p.kind == nkSym:
-      if i != sonsLen(n)-1: add(result, ", ")
+        add(result, p.sym.name.s)
-    else:
+        add(result, ": ")
-      result.add renderTree(p)
+        add(result, typeToString(p.sym.typ, prefer))
-  add(result, ')')
+        if i != sonsLen(n)-1: add(result, ", ")
-  if n.sons[0].typ != nil:
+      else:
-    result.add(": " & typeToString(n.sons[0].typ, prefer))
+        result.add renderTree(p)
+    add(result, ')')
+    if n.sons[0].typ != nil:
+      result.add(": " & typeToString(n.sons[0].typ, prefer))
   result.add "[declared in "
   result.add(conf$sym.info)
   result.add "]"

compiler/vm.nim

@@ -65,15 +65,20 @@ proc stackTraceAux(c: PCtx; x: PStackFrame; pc: int; recursionLimit=100) =
       return
     stackTraceAux(c, x.next, x.comesFrom, recursionLimit-1)
     var info = c.debug[pc]
-    # we now use the same format as in system/except.nim
+    # we now use a format similar to the one in lib/system/excpt.nim
-    var s = substr(toFilename(c.config, info), 0)
+    var s = ""
-    # this 'substr' prevents a strange corruption. XXX This needs to be
+    # todo: factor with quotedFilename
-    # investigated eventually but first attempts to fix it broke everything
+    if optExcessiveStackTrace in c.config.globalOptions:
-    # see the araq-wip-fixed-writebarrier branch.
+      s = toFullPath(c.config, info)
+    else:
+      s = toFilename(c.config, info)
     var line = toLinenumber(info)
+    var col = toColumn(info)
     if line > 0:
       add(s, '(')
       add(s, $line)
+      add(s, ", ")
+      add(s, $(col + ColOffset))
       add(s, ')')
     if x.prc != nil:
       for k in 1..max(1, 25-s.len): add(s, ' ')

tests/errmsgs/m8794.nim

@@ -0,0 +1,2 @@
+type Foo3* = object
+  a1: int

tests/errmsgs/t8794.nim

@@ -0,0 +1,39 @@
+discard """
+  cmd: "nim check $options $file"
+  errormsg: ""
+  nimout: '''
+t8794.nim(39, 27) Error: undeclared field: 'a3' for type m8794.Foo3[declared in m8794.nim(1, 6)]
+'''
+"""
+
+
+
+
+
+
+
+
+
+
+
+
+## line 20
+
+## issue #8794
+
+import m8794
+
+when false: # pending https://github.com/nim-lang/Nim/pull/10091 add this
+  type Foo = object
+    a1: int
+
+  discard Foo().a2
+
+type Foo3b = Foo3
+var x2: Foo3b
+
+proc getFun[T](): T =
+  var a: T
+  a
+
+discard getFun[type(x2)]().a3

tests/errmsgs/t9768.nim

@@ -0,0 +1,30 @@
+discard """
+  errmsg: "unhandled exception:"
+  file: "system.nim"
+  nimout: '''
+stack trace: (most recent call last)
+t9768.nim(28, 33)        main
+t9768.nim(23, 11)        foo1
+'''
+"""
+
+
+
+
+
+
+
+
+
+
+## line 20
+
+proc foo1(a: int): auto =
+  doAssert a < 4
+  result = a * 2
+
+proc main()=
+  static:
+    if foo1(1) > 0: discard foo1(foo1(2))
+
+main()