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VM: fixes most ran-out-registers problems [backport] #12485

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merged 1 commit into from
Oct 24, 2019
Merged

VM: fixes most ran-out-registers problems [backport] #12485

merged 1 commit into from
Oct 24, 2019

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Araq
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@Araq Araq commented Oct 22, 2019

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@zevv
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zevv commented Oct 22, 2019

A pretty hefty test case that used to run out of registers now shows:

Error: unhandled exception: vmgen.nim(354, 20) `false` leaking temporary 10 slotTempInt [AssertionError]

Stack:

/home/ico/external/Nim/compiler/nim.nim(106) nim
/home/ico/external/Nim/compiler/nim.nim(83) handleCmdLine
/home/ico/external/Nim/compiler/cmdlinehelper.nim(98) loadConfigsAndRunMainCommand
/home/ico/external/Nim/compiler/main.nim(188) mainCommand
/home/ico/external/Nim/compiler/main.nim(92) commandCompileToC
/home/ico/external/Nim/compiler/modules.nim(144) compileProject
/home/ico/external/Nim/compiler/modules.nim(85) compileModule
/home/ico/external/Nim/compiler/passes.nim(216) processModule
/home/ico/external/Nim/compiler/passes.nim(86) processTopLevelStmt
/home/ico/external/Nim/compiler/sem.nim(601) myProcess
/home/ico/external/Nim/compiler/sem.nim(569) semStmtAndGenerateGenerics
/home/ico/external/Nim/compiler/semstmts.nim(2214) semStmt
/home/ico/external/Nim/compiler/semexprs.nim(987) semExprNoType
/home/ico/external/Nim/compiler/semexprs.nim(2775) semExpr
/home/ico/external/Nim/compiler/importer.nim(214) evalImport
/home/ico/external/Nim/compiler/importer.nim(184) impMod
/home/ico/external/Nim/compiler/importer.nim(156) myImportModule
/home/ico/external/Nim/compiler/modules.nim(99) importModule
/home/ico/external/Nim/compiler/modules.nim(85) compileModule
/home/ico/external/Nim/compiler/passes.nim(216) processModule
/home/ico/external/Nim/compiler/passes.nim(86) processTopLevelStmt
/home/ico/external/Nim/compiler/sem.nim(601) myProcess
/home/ico/external/Nim/compiler/sem.nim(569) semStmtAndGenerateGenerics
/home/ico/external/Nim/compiler/semstmts.nim(2214) semStmt
/home/ico/external/Nim/compiler/semexprs.nim(987) semExprNoType
/home/ico/external/Nim/compiler/semexprs.nim(2775) semExpr
/home/ico/external/Nim/compiler/importer.nim(214) evalImport
/home/ico/external/Nim/compiler/importer.nim(184) impMod
/home/ico/external/Nim/compiler/importer.nim(156) myImportModule
/home/ico/external/Nim/compiler/modules.nim(99) importModule
/home/ico/external/Nim/compiler/modules.nim(85) compileModule
/home/ico/external/Nim/compiler/passes.nim(210) processModule
/home/ico/external/Nim/compiler/passes.nim(86) processTopLevelStmt
/home/ico/external/Nim/compiler/sem.nim(601) myProcess
/home/ico/external/Nim/compiler/sem.nim(569) semStmtAndGenerateGenerics
/home/ico/external/Nim/compiler/semstmts.nim(2214) semStmt
/home/ico/external/Nim/compiler/semexprs.nim(987) semExprNoType
/home/ico/external/Nim/compiler/semexprs.nim(2742) semExpr
/home/ico/external/Nim/compiler/semstmts.nim(2154) semStmtList
/home/ico/external/Nim/compiler/semexprs.nim(2639) semExpr
/home/ico/external/Nim/compiler/semexprs.nim(969) semDirectOp
/home/ico/external/Nim/compiler/semexprs.nim(861) afterCallActions
/home/ico/external/Nim/compiler/sem.nim(470) semMacroExpr
/home/ico/external/Nim/compiler/vm.nim(2158) evalMacroCall
/home/ico/external/Nim/compiler/vm.nim(1113) rawExecute
/home/ico/external/Nim/compiler/vm.nim(459) compile
/home/ico/external/Nim/compiler/vmgen.nim(2251) genProc
/home/ico/external/Nim/compiler/vmgen.nim(286) gen
/home/ico/external/Nim/compiler/vmgen.nim(2060) gen
/home/ico/external/Nim/compiler/vmgen.nim(286) gen
/home/ico/external/Nim/compiler/vmgen.nim(2047) gen
/home/ico/external/Nim/compiler/vmgen.nim(343) genBlock
/home/ico/external/Nim/compiler/vmgen.nim(2060) gen
/home/ico/external/Nim/compiler/vmgen.nim(286) gen
/home/ico/external/Nim/compiler/vmgen.nim(2060) gen
/home/ico/external/Nim/compiler/vmgen.nim(286) gen
/home/ico/external/Nim/compiler/vmgen.nim(2047) gen
/home/ico/external/Nim/compiler/vmgen.nim(343) genBlock
/home/ico/external/Nim/compiler/vmgen.nim(2060) gen
/home/ico/external/Nim/compiler/vmgen.nim(286) gen
/home/ico/external/Nim/compiler/vmgen.nim(2060) gen
/home/ico/external/Nim/compiler/vmgen.nim(286) gen
/home/ico/external/Nim/compiler/vmgen.nim(2047) gen
/home/ico/external/Nim/compiler/vmgen.nim(354) genBlock
/home/ico/external/Nim/lib/system/assertions.nim(27) failedAssertImpl
/home/ico/external/Nim/lib/system/assertions.nim(20) raiseAssert
/home/ico/external/Nim/lib/system/fatal.nim(39) sysFatal

@krux02
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krux02 commented Oct 22, 2019

@zevv can you tell what code failed specifically?

krux02
krux02 reviewed Oct 22, 2019
View reviewed changes
compiler/vmgen.nim
Comment on lines +349 to +354
if c.prc.slots[i].inUse and c.prc.slots[i].kind in {slotTempUnknown,
slotTempInt,
slotTempFloat,
slotTempStr,
slotTempComplex}:
doAssert false, "leaking temporary " & $i & " " & $c.prc.slots[i].kind
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I am not sure if I like this part. Maybe a normal assert is better here. Currently koch boot -d:danger will have this test enabled, even though that is not the desired behavior here.

@narimiran narimiran closed this Oct 24, 2019
@narimiran narimiran reopened this Oct 24, 2019
@Araq Araq merged commit 801a794 into devel Oct 24, 2019
@Araq Araq deleted the araq-vm-improvements branch October 24, 2019 15:29
narimiran pushed a commit that referenced this pull request Oct 24, 2019
@Araq @narimiran
VM: fixes most ran-out-registers problems [backport] (#12485)
f69dac8 
(cherry picked from commit 801a794)
@zevv
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zevv commented Oct 28, 2019

sorry for the late response, I thought it was caused by my Nim compiler being in some kind of mixed up state, but I now get the same error on devel.

I'm having a hard time to isolate the issue, but reproducing is easy. Do a nimble install npeg and compile:

import npeg

will give the above error.

@zevv
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zevv commented Oct 28, 2019 •
edited
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Reduced it down to this snippet:

type

  thingKind = enum
    One

  Thing = object
    case op: thingKind
      of One:
        name: int

static:
  var g: seq[Thing]
  for i in g.items:
    if i.op == One:
      var i2 = i
      i2.name = 44

Reported as a separate issue at #12547

@zevv zevv mentioned this pull request Oct 28, 2019
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4 participants
@Araq @zevv @krux02 @narimiran