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[stdlib] Shims for UBreakIterator and thread local storage.

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Introduce shims for using UBreakIterators from ICU. Also introduce
shims for using thread local storage via pthreads.

We will be relying on ICU and UBreakIterators for grapheme
breaking. But, UBreakIterators are very expensive to create,
especially for the way we do grapheme breaking, which is relatively
stateless. Thus, we will stash one or more into thread local storage
and reset it as needed.

Note: Currently, pthread_key_t is hard coded for a single platform
(Darwin), but I have a static_assert alongside directions on how to
adapt it to any future platforms who differ in key type.
This commit is contained in:
Michael Ilseman
2017-05-03 18:52:52 -07:00
parent bb4d90f3cf
commit 5eb5e34897
6 changed files with 318 additions and 0 deletions
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42
stdlib/public/stubs/UnicodeNormalization.cpp
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@@ -22,6 +22,7 @@
#include <algorithm>
#include <mutex>
#include <assert.h>
#endif
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdocumentation"
@@ -30,11 +31,13 @@
#include <unicode/ucol.h>
#include <unicode/ucoleitr.h>
#include <unicode/uiter.h>
#include <unicode/ubrk.h>
#pragma clang diagnostic pop
#include "../SwiftShims/UnicodeShims.h"
#if !defined(__APPLE__)
static const UCollator *MakeRootCollator() {
UErrorCode ErrorCode = U_ZERO_ERROR;
UCollator *root = ucol_open("", &ErrorCode);
@@ -291,3 +294,42 @@ swift::_swift_stdlib_unicode_strToLower(uint16_t *Destination,
swift::Lazy<ASCIICollation> ASCIICollation::theTable;
#endif
namespace {
template <typename T, typename U> T *ptr_cast(U *p) {
return static_cast<T *>(static_cast<void *>(p));
}
template <typename T, typename U> const T *ptr_cast(const U *p) {
return static_cast<const T *>(static_cast<const void *>(p));
}
}
void swift::__swift_stdlib_ubrk_close(
swift::__swift_stdlib_UBreakIterator *bi) {
ubrk_close(ptr_cast<UBreakIterator>(bi));
}
swift::__swift_stdlib_UBreakIterator *swift::__swift_stdlib_ubrk_open(
swift::__swift_stdlib_UBreakIteratorType type, const char *locale,
const UChar *text, int32_t textLength, __swift_stdlib_UErrorCode *status) {
return ptr_cast<swift::__swift_stdlib_UBreakIterator>(
ubrk_open(static_cast<UBreakIteratorType>(type), locale, text, textLength,
ptr_cast<UErrorCode>(status)));
}
int32_t
swift::__swift_stdlib_ubrk_preceding(swift::__swift_stdlib_UBreakIterator *bi,
int32_t offset) {
return ubrk_preceding(ptr_cast<UBreakIterator>(bi), offset);
}
int32_t
swift::__swift_stdlib_ubrk_following(swift::__swift_stdlib_UBreakIterator *bi,
int32_t offset) {
return ubrk_following(ptr_cast<UBreakIterator>(bi), offset);
}
void swift::__swift_stdlib_ubrk_setText(
swift::__swift_stdlib_UBreakIterator *bi, const __swift_stdlib_UChar *text,
__swift_int32_t textLength, __swift_stdlib_UErrorCode *status) {
return ubrk_setText(ptr_cast<UBreakIterator>(bi), ptr_cast<UChar>(text),
textLength, ptr_cast<UErrorCode>(status));
}