VM supports math and a few os procs

compiler/vmhooks.nim

@@ -0,0 +1,45 @@
+#
+#
+#           The Nim Compiler
+#        (c) Copyright 2014 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+template setX(k, field) {.immediate, dirty.} =
+  var s: seq[TFullReg]
+  move(s, cast[seq[TFullReg]](a.slots))
+  if s[a.ra].kind != k:
+    myreset(s[a.ra])
+    s[a.ra].kind = k
+  s[a.ra].field = v
+
+proc setResult*(a: VmArgs; v: BiggestInt) = setX(rkInt, intVal)
+proc setResult*(a: VmArgs; v: BiggestFloat) = setX(rkFloat, floatVal)
+proc setResult*(a: VmArgs; v: bool) = 
+  let v = v.ord
+  setX(rkInt, intVal)
+
+proc setResult*(a: VmArgs; v: string) =
+  var s: seq[TFullReg]
+  move(s, cast[seq[TFullReg]](a.slots))
+  if s[a.ra].kind != rkNode:
+    myreset(s[a.ra])
+    s[a.ra].kind = rkNode
+  s[a.ra].node = newNode(nkStrLit)
+  s[a.ra].node.strVal = v
+
+template getX(k, field) {.immediate, dirty.} =
+  doAssert i < a.rc-1
+  let s = cast[seq[TFullReg]](a.slots)
+  doAssert s[i+a.rb+1].kind == k
+  result = s[i+a.rb+1].field
+
+proc getInt*(a: VmArgs; i: Natural): BiggestInt = getX(rkInt, intVal)
+proc getFloat*(a: VmArgs; i: Natural): BiggestFloat = getX(rkFloat, floatVal)
+proc getString*(a: VmArgs; i: Natural): string =
+  doAssert i < a.rc-1
+  let s = cast[seq[TFullReg]](a.slots)
+  doAssert s[i+a.rb+1].kind == rkNode
+  result = s[i+a.rb+1].node.strVal