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Remove "illegal" UnsafePointer casts from the stdlib.

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Update for SE-0107: UnsafeRawPointer

This adds a "mutating" initialize to UnsafePointer to make
Immutable -> Mutable conversions explicit.

These are quick fixes to stdlib, overlays, and test cases that are necessary
in order to remove arbitrary UnsafePointer conversions.

Many cases can be expressed better up by reworking the surrounding
code, but we first need a working starting point.
This commit is contained in:
Andrew Trick
2016-07-26 22:39:58 -07:00
parent 178d194aa1
commit 0b75ee975e
41 changed files with 418 additions and 326 deletions
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4
stdlib/public/core/Unicode.swift
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@@ -427,7 +427,9 @@ public struct UTF8 : UnicodeCodec {
}
public static func _nullCodeUnitOffset(in input: UnsafePointer<CodeUnit>) -> Int {
return Int(_swift_stdlib_strlen(UnsafePointer(input)))
// Relying on a permissive memory model in C.
let cstr = unsafeBitCast(input, to: UnsafePointer<CChar>.self)
return Int(_swift_stdlib_strlen(cstr))
}
// Support parsing C strings as-if they are UTF8 strings.
public static func _nullCodeUnitOffset(in input: UnsafePointer<CChar>) -> Int {