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hashes: implement murmur3 (#12022)

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* hashes: implement murmur3
* refactoring; there is only one murmurHash and it works at compile-time via VM hooks
* fixes JS tests
* makes toOpenArrayByte work with C++
* make it bootstrap in C++ mode for 0.20
This commit is contained in:
Miran 2019-09-01 00:04:10 +02:00 • committed by Andreas Rumpf
commit ab48d7901e
7 changed files with 204 additions and 59 deletions
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29
compiler/vmops.nim
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@ -17,6 +17,8 @@ from os import getEnv, existsEnv, dirExists, fileExists, putEnv, walkDir, getApp
from md5 import getMD5
from sighashes import symBodyDigest
from hashes import hash
template mathop(op) {.dirty.} =
registerCallback(c, "stdlib.math." & astToStr(op), `op Wrapper`)
@ -157,3 +159,30 @@ proc registerAdditionalOps*(c: PCtx) =
stackTrace(c, PStackFrame(prc: c.prc.sym, comesFrom: 0, next: nil), c.exceptionInstr,
"isExported() requires a symbol. '" & $n & "' is of kind '" & $n.kind & "'", n.info)
setResult(a, sfExported in n.sym.flags)
proc hashVmImpl(a: VmArgs) =
var res = hashes.hash(a.getString(0), a.getInt(1).int, a.getInt(2).int)
if c.config.cmd == cmdCompileToJS:
# emulate JS's terrible integers:
res = cast[int32](res)
setResult(a, res)
registerCallback c, "stdlib.hashes.hashVmImpl", hashVmImpl
proc hashVmImplByte(a: VmArgs) =
# nkBracket[...]
let sPos = a.getInt(1).int
let ePos = a.getInt(2).int
let arr = a.getNode(0)
var bytes = newSeq[byte](arr.len)
for i in 0 ..< arr.len:
bytes[i] = byte(arr[i].intVal and 0xff)
var res = hashes.hash(bytes, sPos, ePos)
if c.config.cmd == cmdCompileToJS:
# emulate JS's terrible integers:
res = cast[int32](res)
setResult(a, res)
registerCallback c, "stdlib.hashes.hashVmImplByte", hashVmImplByte
registerCallback c, "stdlib.hashes.hashVmImplChar", hashVmImplByte