# compiler/vm

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This file implements the new evaluation engine for Nim code. An instruction is 1-3 int32s in memory, it is a register based VM.

# Imports

msgs, vmdef, vmgen, nimsets, types, passes, parser, vmdeps, idents, trees, renderer, options, transf, vmmarshal, gorgeimpl, lineinfos, btrees, macrocacheimpl, modulegraphs, sighashes, int128, vmprofiler, ast, semfold, evaltempl, magicsys, pathutils, vmconv

# Consts

    evalPass = (myOpen, myProcess, myClose, false)

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# Procs

    proc evalConstExpr(module: PSym; idgen: IdGenerator; g: ModuleGraph; e: PNode): PNode {....raises: [
        Exception, ValueError, KeyError, OSError, IOError, ERecoverableError,
        JsonParsingError], tags: [RootEffect, ReadDirEffect, WriteIOEffect,
                                  ReadIOEffect, ReadEnvEffect, TimeEffect,
                                  ExecIOEffect].}

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    proc evalExpr(c: PCtx; n: PNode): PNode {....raises: [Exception, ValueError,
        KeyError, OSError, IOError, ERecoverableError, JsonParsingError], tags: [
        RootEffect, ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect,
        TimeEffect, ExecIOEffect].}

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    proc evalMacroCall(module: PSym; idgen: IdGenerator; g: ModuleGraph;
                       templInstCounter: ref int; n, nOrig: PNode; sym: PSym): PNode {....raises: [
        Exception, ValueError, KeyError, OSError, IOError, ERecoverableError,
        JsonParsingError], tags: [RootEffect, ReadDirEffect, WriteIOEffect,
                                  ReadIOEffect, ReadEnvEffect, TimeEffect,
                                  ExecIOEffect].}

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    proc evalStaticExpr(module: PSym; idgen: IdGenerator; g: ModuleGraph; e: PNode;
                        prc: PSym): PNode {....raises: [Exception, ValueError,
        KeyError, OSError, IOError, ERecoverableError, JsonParsingError], tags: [
        RootEffect, ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect,
        TimeEffect, ExecIOEffect].}

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    proc evalStaticStmt(module: PSym; idgen: IdGenerator; g: ModuleGraph; e: PNode;
                        prc: PSym) {....raises: [Exception, ValueError, KeyError,
        OSError, IOError, ERecoverableError, JsonParsingError], tags: [RootEffect,
        ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect, TimeEffect,
        ExecIOEffect].}

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    proc evalStmt(c: PCtx; n: PNode) {....raises: [Exception, ValueError, KeyError,
        OSError, IOError, ERecoverableError, JsonParsingError], tags: [RootEffect,
        ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect, TimeEffect,
        ExecIOEffect].}

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    proc execProc(c: PCtx; sym: PSym; args: openArray[PNode]): PNode {....raises: [
        Exception, ValueError, KeyError, OSError, IOError, ERecoverableError,
        JsonParsingError], tags: [RootEffect, ReadDirEffect, WriteIOEffect,
                                  ReadIOEffect, ReadEnvEffect, TimeEffect,
                                  ExecIOEffect].}

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    proc getBool(a: VmArgs; i: Natural): bool {....raises: [], tags: [].}

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    proc getFloat(a: VmArgs; i: Natural): BiggestFloat {....raises: [], tags: [].}

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    proc getGlobalValue(c: PCtx; s: PSym): PNode {....raises: [Exception, ValueError,
        KeyError, OSError, IOError, ERecoverableError], tags: [RootEffect,
        ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

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    proc getInt(a: VmArgs; i: Natural): BiggestInt {....raises: [], tags: [].}

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    proc getNode(a: VmArgs; i: Natural): PNode {....raises: [], tags: [].}

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    proc getNodeAddr(a: VmArgs; i: Natural): PNode {....raises: [], tags: [].}

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    proc getString(a: VmArgs; i: Natural): string {....raises: [], tags: [].}

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    proc getVar(a: VmArgs; i: Natural): PNode {....raises: [], tags: [].}

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    proc numArgs(a: VmArgs): int {....raises: [], tags: [].}

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    proc registerAdditionalOps(c: PCtx) {....raises: [], tags: [].}

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    proc setGlobalValue(c: PCtx; s: PSym; val: PNode) {....raises: [Exception,
        ValueError, KeyError, OSError, IOError, ERecoverableError], tags: [
        RootEffect, ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

  Does not do type checking so ensure the `val` matches the `s.typ` Source Edit

    proc setResult(a: VmArgs; n: PNode) {....raises: [], tags: [].}

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    proc setResult(a: VmArgs; v: AbsoluteDir) {....raises: [], tags: [].}

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    proc setResult(a: VmArgs; v: BiggestFloat) {....raises: [], tags: [].}

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    proc setResult(a: VmArgs; v: BiggestInt) {....raises: [], tags: [].}

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    proc setResult(a: VmArgs; v: bool) {....raises: [], tags: [].}

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    proc setResult(a: VmArgs; v: seq[string]) {....raises: [], tags: [].}

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    proc setResult(a: VmArgs; v: string) {....raises: [], tags: [].}

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    proc setupCompileTimeVar(module: PSym; idgen: IdGenerator; g: ModuleGraph;
                             n: PNode) {....raises: [Exception, ValueError, KeyError,
        OSError, IOError, ERecoverableError, JsonParsingError], tags: [RootEffect,
        ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect, TimeEffect,
        ExecIOEffect].}

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    proc setupGlobalCtx(module: PSym; graph: ModuleGraph; idgen: IdGenerator) {.
        ...raises: [], tags: [].}

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# Iterators

    iterator genericParamsInMacroCall(macroSym: PSym; call: PNode): (PSym, PNode) {.
        ...raises: [], tags: [].}

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