vmdef

Source   Edit  

This module contains the type definitions for the new evaluation engine. An instruction is 1-3 int32s in memory, it is a register based VM.

Types

PCtx = ref TCtx
Source   Edit  
PProc = ref object
  blocks*: seq[TBlock]
  sym*: PSym
  regInfo*: seq[tuple[inUse: bool, kind: TSlotKind]]
Source   Edit  
Profiler = object
  tEnter*: float
  tos*: PStackFrame
Source   Edit  
TBlock = object
  label*: PSym
  fixups*: seq[TPosition]
Source   Edit  
TCtx = object of TPassContext
  code*: seq[TInstr]
  debug*: seq[TLineInfo]
  globals*: PNode
  constants*: PNode
  types*: seq[PType]
  currentExceptionA*, currentExceptionB*: PNode
  exceptionInstr*: int
  prc*: PProc
  module*: PSym
  callsite*: PNode
  mode*: TEvalMode
  features*: TSandboxFlags
  traceActive*: bool
  loopIterations*: int
  comesFromHeuristic*: TLineInfo
  callbacks*: seq[VmCallback]
  callbackIndex*: Table[string, int]
  errorFlag*: string
  cache*: IdentCache
  config*: ConfigRef
  graph*: ModuleGraph
  oldErrorCount*: int
  profiler*: Profiler
  templInstCounter*: ref int
  vmstateDiff*: seq[(PSym, PNode)]
  procToCodePos*: Table[int, int]
Source   Edit  
TDest = range[-1 .. 65535'u64.int]
Source   Edit  
TEvalMode = enum
  emRepl,                   ## evaluate because in REPL mode
  emConst,                  ## evaluate for 'const' according to spec
  emOptimize,               ## evaluate for optimization purposes (same as
                             ## emConst?)
  emStaticExpr,             ## evaluate for enforced compile time eval
                             ## ('static' context)
  emStaticStmt               ## 'static' as an expression
reason for evaluation Source   Edit  
TFullReg = object
  case kind*: TRegisterKind
  of rkNone:
    nil
  of rkInt:
    intVal*: BiggestInt
  of rkFloat:
    floatVal*: BiggestFloat
  of rkNode:
    node*: PNode
  of rkRegisterAddr:
    regAddr*: ptr TFullReg
  of rkNodeAddr:
    nodeAddr*: ptr PNode
  
Source   Edit  
TInstr = distinct TInstrType
Source   Edit  
TInstrType = uint64
Source   Edit  
TOpcode = enum
  opcEof, opcRet, opcYldYoid, opcYldVal, opcAsgnInt, opcAsgnFloat, opcAsgnRef,
  opcAsgnComplex, opcCastIntToFloat32, opcCastIntToFloat64, opcCastFloatToInt32,
  opcCastFloatToInt64, opcCastPtrToInt, opcCastIntToPtr, opcFastAsgnComplex,
  opcNodeToReg, opcLdArr, opcLdArrAddr, opcWrArr, opcLdObj, opcLdObjAddr,
  opcWrObj, opcAddrReg, opcAddrNode, opcLdDeref, opcWrDeref, opcWrStrIdx,
  opcLdStrIdx, opcLdStrIdxAddr, opcSlice, opcAddInt, opcAddImmInt, opcSubInt,
  opcSubImmInt, opcLenSeq, opcLenStr, opcLenCstring, opcIncl, opcInclRange,
  opcExcl, opcCard, opcMulInt, opcDivInt, opcModInt, opcAddFloat, opcSubFloat,
  opcMulFloat, opcDivFloat, opcShrInt, opcShlInt, opcAshrInt, opcBitandInt,
  opcBitorInt, opcBitxorInt, opcAddu, opcSubu, opcMulu, opcDivu, opcModu,
  opcEqInt, opcLeInt, opcLtInt, opcEqFloat, opcLeFloat, opcLtFloat, opcLeu,
  opcLtu, opcEqRef, opcEqNimNode, opcSameNodeType, opcXor, opcNot,
  opcUnaryMinusInt, opcUnaryMinusFloat, opcBitnotInt, opcEqStr, opcEqCString,
  opcLeStr, opcLtStr, opcEqSet, opcLeSet, opcLtSet, opcMulSet, opcPlusSet,
  opcMinusSet, opcConcatStr, opcContainsSet, opcRepr, opcSetLenStr,
  opcSetLenSeq, opcIsNil, opcOf, opcIs, opcParseFloat, opcConv, opcCast,
  opcQuit, opcInvalidField, opcNarrowS, opcNarrowU, opcSignExtend, opcAddStrCh,
  opcAddStrStr, opcAddSeqElem, opcRangeChck, opcNAdd, opcNAddMultiple, opcNKind,
  opcNSymKind, opcNIntVal, opcNFloatVal, opcNSymbol, opcNIdent, opcNGetType,
  opcNStrVal, opcNSigHash, opcNGetSize, opcNSetIntVal, opcNSetFloatVal,
  opcNSetSymbol, opcNSetIdent, opcNSetStrVal, opcNNewNimNode, opcNCopyNimNode,
  opcNCopyNimTree, opcNDel, opcGenSym, opcNccValue, opcNccInc, opcNcsAdd,
  opcNcsIncl, opcNcsLen, opcNcsAt, opcNctPut, opcNctLen, opcNctGet,
  opcNctHasNext, opcNctNext, opcNodeId, opcSlurp, opcGorge, opcParseExprToAst,
  opcParseStmtToAst, opcQueryErrorFlag, opcNError, opcNWarning, opcNHint,
  opcNGetLineInfo, opcNCopyLineInfo, opcNSetLineInfoLine, opcNSetLineInfoColumn,
  opcNSetLineInfoFile, opcEqIdent, opcStrToIdent, opcGetImpl, opcGetImplTransf,
  opcEcho, opcIndCall, opcIndCallAsgn, opcRaise, opcNChild, opcNSetChild,
  opcCallSite, opcNewStr, opcTJmp, opcFJmp, opcJmp, opcJmpBack, opcBranch,
  opcTry, opcExcept, opcFinally, opcFinallyEnd, opcNew, opcNewSeq, opcLdNull,
  opcLdNullReg, opcLdConst, opcAsgnConst, opcLdGlobal, opcLdGlobalAddr,
  opcLdGlobalDerefFFI, opcLdGlobalAddrDerefFFI, opcLdImmInt, opcNBindSym,
  opcNDynBindSym, opcSetType, opcTypeTrait, opcSymOwner, opcSymIsInstantiationOf
Source   Edit  
TPosition = distinct int
Source   Edit  
TRegister = range[0 .. 65535'u64.int]
Source   Edit  
TRegisterKind = enum
  rkNone, rkNode, rkInt, rkFloat, rkRegisterAddr, rkNodeAddr
Source   Edit  
TSandboxFlag = enum
  allowCast,                ## allow unsafe language feature: 'cast'
  allowInfiniteLoops         ## allow endless loops
what the evaluation engine should allow Source   Edit  
TSlotKind = enum
  slotEmpty, slotFixedVar, slotFixedLet, slotTempUnknown, slotTempInt,
  slotTempFloat, slotTempStr, slotTempComplex, slotTempPerm
Source   Edit  
TStackFrame {.acyclic.} = object
  prc*: PSym
  slots*: seq[TFullReg]
  next*: PStackFrame
  comesFrom*: int
  safePoints*: seq[int]
Source   Edit  
VmArgs = object
  ra*, rb*, rc*: Natural = 0
  slots*: ptr UncheckedArray[TFullReg]
  currentException*: PNode
  currentLineInfo*: TLineInfo
Source   Edit  
VmCallback = proc (args: VmArgs) {.closure.}
Source   Edit  

Consts

byteExcess = 128
Source   Edit  
firstABxInstr = opcTJmp
Source   Edit  
largeInstrs = {opcConv, opcCast, opcNewSeq, opcOf}
Source   Edit  
nimNodeFlag = 16
Source   Edit  
regAMask = 65535'u64
Source   Edit  
regAShift = 8'u64
Source   Edit  
regBMask = 65535'u64
Source   Edit  
regBShift = 24'u64
Source   Edit  
regBxMask = 16777215'u64
Source   Edit  
regBxMax = 8388607
Source   Edit  
regBxMin = -8388607
Source   Edit  
regBxShift = 24'u64
Source   Edit  
regCMask = 65535'u64
Source   Edit  
regCShift = 40'u64
Source   Edit  
regOMask = 255'u64
Source   Edit  
regOShift = 0'u
Source   Edit  
relativeJumps = {opcTJmp, opcFJmp, opcJmp, opcJmpBack}
Source   Edit  
slotSomeTemp = slotTempUnknown
Source   Edit  
wordExcess = 8388608
Source   Edit  

Procs

proc newCtx(module: PSym; cache: IdentCache; g: ModuleGraph; idgen: IdGenerator): PCtx {.
    ...raises: [], tags: [], forbids: [].}
Source   Edit  
proc refresh(c: PCtx; module: PSym; idgen: IdGenerator) {....raises: [], tags: [],
    forbids: [].}
Source   Edit  
proc registerCallback(c: PCtx; name: string; callback: VmCallback): int {.
    discardable, ...raises: [], tags: [], forbids: [].}
Source   Edit  

Templates

template jmpDiff(x: TInstr): int
Source   Edit  
template opcode(x: TInstr): TOpcode
Source   Edit  
template regA(x: TInstr): TRegister
Source   Edit  
template regB(x: TInstr): TRegister
Source   Edit  
template regBx(x: TInstr): int
Source   Edit  
template regC(x: TInstr): TRegister
Source   Edit