fixes #9829 (#11849)

(cherry picked from commit b73d097)
nim-lang · Aug 13, 2019 · 38893a3 · 38893a3
1 parent 0354271
commit 38893a3
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diff --git a/compiler/vmgen.nim b/compiler/vmgen.nim
@@ -2176,7 +2176,7 @@ proc optimizeJumps(c: PCtx; start: int) =
       var d = i + c.code[i].jmpDiff
       for iters in countdown(maxIterations, 0):
         case c.code[d].opcode
-        of opcJmp, opcJmpBack:
+        of opcJmp:
           d = d + c.code[d].jmpDiff
         of opcTJmp, opcFJmp:
           if c.code[d].regA != reg: break

diff --git a/tests/vm/tmaxloopiterations.nim b/tests/vm/tmaxloopiterations.nim
@@ -0,0 +1,15 @@
+discard """
+errormsg: "interpretation requires too many iterations; if you are sure this is not a bug in your code edit compiler/vmdef.MaxLoopIterations and rebuild the compiler"
+"""
+
+# issue #9829
+
+macro foo(): untyped  =
+  let lines = ["123", "5423"]
+  var idx = 0
+  while idx < lines.len():
+    if lines[idx].len() < 1:
+      inc(idx)
+      continue
+
+foo()