# lowerings

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This module implements common simple lowerings.

# Imports

ast, astalgo, types, idents, magicsys, msgs, options, modulegraphs, lineinfos

# Consts

    genPrefix = ":tmp"

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# Procs

    proc addField(obj: PType; s: PSym; cache: IdentCache; idgen: IdGenerator): PSym {.
        ...raises: [], tags: [], forbids: [].}

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    proc addUniqueField(obj: PType; s: PSym; cache: IdentCache; idgen: IdGenerator): PSym {.
        discardable, ...raises: [], tags: [], forbids: [].}

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    proc addVar(father, v, value: PNode) {....raises: [], tags: [], forbids: [].}

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    proc addVar(father, v: PNode) {....raises: [], tags: [], forbids: [].}

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    proc callCodegenProc(g: ModuleGraph; name: string;
                         info: TLineInfo = unknownLineInfo; arg1: PNode = nil;
                         arg2: PNode = nil; arg3: PNode = nil;
                         optionalArgs: PNode = nil): PNode {....raises: [KeyError,
        ValueError, OSError, Exception, IOError, ERecoverableError], tags: [
        ReadDirEffect, RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect],
        forbids: [].}

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    proc createObj(g: ModuleGraph; idgen: IdGenerator; owner: PSym; info: TLineInfo;
                   final = true): PType {....raises: [KeyError, ValueError, OSError,
        Exception], tags: [ReadDirEffect, RootEffect], forbids: [].}

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    proc evalOnce(g: ModuleGraph; value: PNode; idgen: IdGenerator; owner: PSym): PNode {.
        ...raises: [], tags: [], forbids: [].}

  Turns (value) into (let tmp = value; tmp) so that 'value' can be re-used freely, multiple times. This is frequently required and such a builtin would also be handy to have in macros.nim. The value that can be reused is 'result.lastSon'! Source Edit

    proc genAddrOf(n: PNode; idgen: IdGenerator; typeKind = tyPtr): PNode {.
        ...raises: [], tags: [], forbids: [].}

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    proc genDeref(n: PNode; k = nkHiddenDeref): PNode {....raises: [], tags: [],
        forbids: [].}

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    proc genHigh(g: ModuleGraph; n: PNode): PNode {....raises: [KeyError, ValueError,
        OSError, Exception, IOError, ERecoverableError], tags: [ReadDirEffect,
        RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect], forbids: [].}

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    proc genLen(g: ModuleGraph; n: PNode): PNode {....raises: [KeyError, ValueError,
        OSError, Exception, IOError, ERecoverableError], tags: [ReadDirEffect,
        RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect], forbids: [].}

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    proc getFieldFromObj(t: PType; v: PSym): PSym {....raises: [], tags: [],
        forbids: [].}

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    proc indirectAccess(a, b: PSym; info: TLineInfo): PNode {....raises: [], tags: [],
        forbids: [].}

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    proc indirectAccess(a: PNode; b: ItemId; info: TLineInfo): PNode {....raises: [],
        tags: [], forbids: [].}

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    proc indirectAccess(a: PNode; b: PSym; info: TLineInfo): PNode {....raises: [],
        tags: [], forbids: [].}

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    proc indirectAccess(a: PNode; b: string; info: TLineInfo; cache: IdentCache): PNode {.
        ...raises: [], tags: [], forbids: [].}

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    proc lowerSwap(g: ModuleGraph; n: PNode; idgen: IdGenerator; owner: PSym): PNode {.
        ...raises: [], tags: [], forbids: [].}

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    proc lowerTupleUnpacking(g: ModuleGraph; n: PNode; idgen: IdGenerator;
                             owner: PSym): PNode {....raises: [KeyError, ValueError,
        OSError, Exception, IOError, ERecoverableError], tags: [ReadDirEffect,
        RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect], forbids: [].}

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    proc newAsgnStmt(le, ri: PNode): PNode {....raises: [], tags: [], forbids: [].}

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    proc newDeref(n: PNode): PNode {.inline, ...raises: [], tags: [], forbids: [].}

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    proc newDotExpr(obj, b: PSym): PNode {....raises: [], tags: [], forbids: [].}

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    proc newFastAsgnStmt(le, ri: PNode): PNode {....raises: [], tags: [], forbids: [].}

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    proc newFastMoveStmt(g: ModuleGraph; le, ri: PNode): PNode {....raises: [KeyError,
        ValueError, OSError, Exception, IOError, ERecoverableError], tags: [
        ReadDirEffect, RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect],
        forbids: [].}

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    proc newIntLit(g: ModuleGraph; info: TLineInfo; value: BiggestInt): PNode {....raises: [
        KeyError, ValueError, OSError, Exception, IOError, ERecoverableError], tags: [
        ReadDirEffect, RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect],
        forbids: [].}

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    proc newTryFinally(body, final: PNode): PNode {....raises: [], tags: [],
        forbids: [].}

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    proc newTupleAccess(g: ModuleGraph; tup: PNode; i: int): PNode {....raises: [
        KeyError, ValueError, OSError, Exception, IOError, ERecoverableError], tags: [
        ReadDirEffect, RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect],
        forbids: [].}

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    proc newTupleAccessRaw(tup: PNode; i: int): PNode {....raises: [KeyError],
        tags: [], forbids: [].}

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    proc rawAddField(obj: PType; field: PSym) {....raises: [], tags: [], forbids: [].}

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    proc rawDirectAccess(obj, field: PSym): PNode {....raises: [], tags: [],
        forbids: [].}

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    proc rawIndirectAccess(a: PNode; field: PSym; info: TLineInfo): PNode {.
        ...raises: [], tags: [], forbids: [].}

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