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added lowerings.evalOnce

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Araq
2019-04-09 11:38:54 +02:00
parent da6ff14184
commit d59e9c37fa
1 changed files with 16 additions and 0 deletions
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16
compiler/lowerings.nim
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@@ -72,6 +72,22 @@ proc lowerTupleUnpacking*(g: ModuleGraph; n: PNode; owner: PSym): PNode =
if n.sons[i].kind == nkSym: v.addVar(n.sons[i])
result.add newAsgnStmt(n.sons[i], newTupleAccess(g, tempAsNode, i))
proc evalOnce*(g: ModuleGraph; value: PNode; owner: PSym): PNode =
## 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'!
result = newNodeIT(nkStmtListExpr, value.info, value.typ)
var temp = newSym(skTemp, getIdent(g.cache, genPrefix), owner, value.info, g.config.options)
temp.typ = skipTypes(value.typ, abstractInst)
incl(temp.flags, sfFromGeneric)
var v = newNodeI(nkLetSection, value.info)
let tempAsNode = newSymNode(temp)
v.addVar(tempAsNode)
result.add(v)
result.add newAsgnStmt(tempAsNode, value)
result.add tempAsNode
proc newTupleAccessRaw*(tup: PNode, i: int): PNode =
result = newNodeI(nkBracketExpr, tup.info)
addSon(result, copyTree(tup))