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#
#
# Nim's Runtime Library
# (c) Copyright 2013 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
# Implementation of some runtime checks.
proc raiseRangeError(val: BiggestInt) {.compilerproc, noinline.} =
when hostOS == "standalone":
sysFatal(RangeError, "value out of range")
else:
sysFatal(RangeError, "value out of range: ", $val)
proc raiseIndexError() {.compilerproc, noinline.} =
sysFatal(IndexError, "index out of bounds")
proc raiseFieldError(f: string) {.compilerproc, noinline.} =
sysFatal(FieldError, f, " is not accessible")
proc chckIndx(i, a, b: int): int =
if i >= a and i <= b:
return i
else:
raiseIndexError()
proc chckRange(i, a, b: int): int =
if i >= a and i <= b:
return i
else:
raiseRangeError(i)
proc chckRange64(i, a, b: int64): int64 {.compilerproc.} =
if i >= a and i <= b:
return i
else:
raiseRangeError(i)
proc chckRangeF(x, a, b: float): float =
if x >= a and x <= b:
return x
else:
when hostOS == "standalone":
sysFatal(RangeError, "value out of range")
else:
sysFatal(RangeError, "value out of range: ", $x)
proc chckNil(p: pointer) =
if p == nil:
sysFatal(ValueError, "attempt to write to a nil address")
#c_raise(SIGSEGV)
proc chckObj(obj, subclass: PNimType) {.compilerproc.} =
# checks if obj is of type subclass:
var x = obj
if x == subclass: return # optimized fast path
while x != subclass:
if x == nil:
sysFatal(ObjectConversionError, "invalid object conversion")
break
x = x.base
proc chckObjAsgn(a, b: PNimType) {.compilerproc, inline.} =
if a != b:
sysFatal(ObjectAssignmentError, "invalid object assignment")
type ObjCheckCache = array[0..1, PNimType]
proc isObjSlowPath(obj, subclass: PNimType;
cache: var ObjCheckCache): bool {.noinline.} =
# checks if obj is of type subclass:
var x = obj.base
while x != subclass:
if x == nil:
cache[0] = obj
return false
x = x.base
cache[1] = obj
return true
proc isObjWithCache(obj, subclass: PNimType;
cache: var ObjCheckCache): bool {.compilerProc, inline.} =
if obj == subclass: return true
if obj.base == subclass: return true
if cache[0] == obj: return false
if cache[1] == obj: return true
return isObjSlowPath(obj, subclass, cache)
proc isObj(obj, subclass: PNimType): bool {.compilerproc.} =
# checks if obj is of type subclass:
var x = obj
if x == subclass: return true # optimized fast path
while x != subclass:
if x == nil: return false
x = x.base
return true
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