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| author | Saem Ghani <saemghani+github@gmail.com> | 2021-02-23 00:02:06 -0800 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-02-23 09:02:06 +0100 |
| commit | 7c2ac988805111df999dd4f586471627ee80efbb (patch) | |
| tree | 331b03c11a0d760270f17787cd8aa2a47f21b66a /compiler | |
| parent | 4e619a6bea75829638a87d53b1d806aface322e7 (diff) | |
| download | Nim-7c2ac988805111df999dd4f586471627ee80efbb.tar.gz | |
Fixes #17039 - ldObj checks node/nodeAddr access (#17123)
Checked field expressions, such as an object variant field access results in occasionally broken address analysis crashing the VM. This guard added here mimics guarded access in ldObjAddr as well. This is to prevent a crash, while a fix is devised.
Diffstat (limited to 'compiler')
| -rw-r--r-- | compiler/vm.nim | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/vm.nim b/compiler/vm.nim index 246d9d4d2..ba14f2d51 100644 --- a/compiler/vm.nim +++ b/compiler/vm.nim @@ -711,7 +711,7 @@ proc rawExecute(c: PCtx, start: int, tos: PStackFrame): TFullReg = of opcLdObj: # a = b.c decodeBC(rkNode) - let src = regs[rb].node + let src = if regs[rb].kind == rkNode: regs[rb].node else: regs[rb].nodeAddr[] case src.kind of nkEmpty..nkNilLit: # for nkPtrLit, this could be supported in the future, use something like: |