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Fun with parameter attributes: For several of the "synthetic" parameters added to D functions, we can apply noalias and nocapture. They are sret parameters, 'nest' pointers passed to nested functions, and _argptr: Nocapture: - Sret and nest are nocapture because they don't represent D-level variables, and thus the callee can't (validly) obtain a pointer to them, let alone keep it around after it returns. - _argptr is nocapture because although the callee has access to it as a pointer, that pointer is invalidated when it returns. All three are noalias because they're function-local variables - Sret and _argptr are noalias because they're freshly alloca'd memory only used for a single function call that's not allowed to keep an aliasing pointer to it around (since the parameter is nocapture). - 'Nest' is noalias because the callee only ever has access to one such pointer per parent function, and every parent function has a different one. This commit also ensures attributes set on sret, _arguments and _argptr are propagated to calls to such functions. It also adds one exception to the general rule that attributes on function types should propagate to calls: the type of a delegate's function pointer has a 'nest' parameter, but this can either be a true 'nest' (for delegates to nested functions) or a 'this' (for delegates to member functions). Since 'this' is neither noalias nor nocapture, and there's generally no way to tell which one it is, we remove these attributes at the call site if the callee is a delegate.
author Frits van Bommel <fvbommel wxs.nl>
date Sat, 14 Mar 2009 22:15:31 +0100
parents f04dde6e882c
children
line wrap: on
line source


// Copyright (c) 1999-2006 by Digital Mars
// All Rights Reserved
// written by Walter Bright
// www.digitalmars.com
// License for redistribution is by either the Artistic License
// in artistic.txt, or the GNU General Public License in gnu.txt.
// See the included readme.txt for details.


#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <assert.h>

#include "dchar.h"
#include "mem.h"

#if M_UNICODE

// Converts a char string to Unicode

dchar *Dchar::dup(char *p)
{
    dchar *s;
    size_t len;

    if (!p)
	return NULL;
    len = strlen(p);
    s = (dchar *)mem.malloc((len + 1) * sizeof(dchar));
    for (unsigned i = 0; i < len; i++)
    {
	s[i] = (dchar)(p[i] & 0xFF);
    }
    s[len] = 0;
    return s;
}

dchar *Dchar::memchr(dchar *p, int c, int count)
{
    int u;

    for (u = 0; u < count; u++)
    {
	if (p[u] == c)
	    return p + u;
    }
    return NULL;
}

#if _WIN32 && __DMC__
__declspec(naked)
unsigned Dchar::calcHash(const dchar *str, unsigned len)
{
    __asm
    {
	mov	ECX,4[ESP]
	mov	EDX,8[ESP]
	xor	EAX,EAX
	test	EDX,EDX
	je	L92

LC8:	cmp	EDX,1
	je	L98
	cmp	EDX,2
	je	LAE

	add	EAX,[ECX]
//	imul	EAX,EAX,025h
	lea	EAX,[EAX][EAX*8]
	add	ECX,4
	sub	EDX,2
	jmp	LC8

L98:	mov	DX,[ECX]
	and	EDX,0FFFFh
	add	EAX,EDX
	ret

LAE:	add	EAX,[ECX]
L92:	ret
    }
}
#else
hash_t Dchar::calcHash(const dchar *str, size_t len)
{
    unsigned hash = 0;

    for (;;)
    {
	switch (len)
	{
	    case 0:
		return hash;

	    case 1:
		hash += *(const uint16_t *)str;
		return hash;

	    case 2:
		hash += *(const uint32_t *)str;
		return hash;

	    default:
		hash += *(const uint32_t *)str;
		hash *= 37;
		str += 2;
		len -= 2;
		break;
	}
    }
}
#endif

hash_t Dchar::icalcHash(const dchar *str, size_t len)
{
    hash_t hash = 0;

    for (;;)
    {
	switch (len)
	{
	    case 0:
		return hash;

	    case 1:
		hash += *(const uint16_t *)str | 0x20;
		return hash;

	    case 2:
		hash += *(const uint32_t *)str | 0x200020;
		return hash;

	    default:
		hash += *(const uint32_t *)str | 0x200020;
		hash *= 37;
		str += 2;
		len -= 2;
		break;
	}
    }
}

#elif MCBS

hash_t Dchar::calcHash(const dchar *str, size_t len)
{
    hash_t hash = 0;

    while (1)
    {
	switch (len)
	{
	    case 0:
		return hash;

	    case 1:
		hash *= 37;
		hash += *(const uint8_t *)str;
		return hash;

	    case 2:
		hash *= 37;
		hash += *(const uint16_t *)str;
		return hash;

	    case 3:
		hash *= 37;
		hash += (*(const uint16_t *)str << 8) +
			((const uint8_t *)str)[2];
		return hash;

	    default:
		hash *= 37;
		hash += *(const uint32_t *)str;
		str += 4;
		len -= 4;
		break;
	}
    }
}

#elif UTF8

// Specification is: http://anubis.dkuug.dk/JTC1/SC2/WG2/docs/n1335

char Dchar::mblen[256] =
{
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
    2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
    3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
    4,4,4,4,4,4,4,4,5,5,5,5,6,6,1,1,
};

dchar *Dchar::dec(dchar *pstart, dchar *p)
{
    while ((p[-1] & 0xC0) == 0x80)
	p--;
    return p;
}

int Dchar::get(dchar *p)
{
    unsigned c;
    unsigned char *q = (unsigned char *)p;

    c = q[0];
    switch (mblen[c])
    {
	case 2:
	    c = ((c    - 0xC0) << 6) |
		 (q[1] - 0x80);
	    break;

	case 3:
	    c = ((c    - 0xE0) << 12) |
		((q[1] - 0x80) <<  6) |
		 (q[2] - 0x80);
	    break;

	case 4:
	    c = ((c    - 0xF0) << 18) |
		((q[1] - 0x80) << 12) |
		((q[2] - 0x80) <<  6) |
		 (q[3] - 0x80);
	    break;

	case 5:
	    c = ((c    - 0xF8) << 24) |
		((q[1] - 0x80) << 18) |
		((q[2] - 0x80) << 12) |
		((q[3] - 0x80) <<  6) |
		 (q[4] - 0x80);
	    break;

	case 6:
	    c = ((c    - 0xFC) << 30) |
		((q[1] - 0x80) << 24) |
		((q[2] - 0x80) << 18) |
		((q[3] - 0x80) << 12) |
		((q[4] - 0x80) <<  6) |
		 (q[5] - 0x80);
	    break;
    }
    return c;
}

dchar *Dchar::put(dchar *p, unsigned c)
{
    if (c <= 0x7F)
    {
	*p++ = c;
    }
    else if (c <= 0x7FF)
    {
	p[0] = 0xC0 + (c >> 6);
	p[1] = 0x80 + (c & 0x3F);
	p += 2;
    }
    else if (c <= 0xFFFF)
    {
	p[0] = 0xE0 + (c >> 12);
	p[1] = 0x80 + ((c >> 6) & 0x3F);
	p[2] = 0x80 + (c & 0x3F);
	p += 3;
    }
    else if (c <= 0x1FFFFF)
    {
	p[0] = 0xF0 + (c >> 18);
	p[1] = 0x80 + ((c >> 12) & 0x3F);
	p[2] = 0x80 + ((c >> 6) & 0x3F);
	p[3] = 0x80 + (c & 0x3F);
	p += 4;
    }
    else if (c <= 0x3FFFFFF)
    {
	p[0] = 0xF8 + (c >> 24);
	p[1] = 0x80 + ((c >> 18) & 0x3F);
	p[2] = 0x80 + ((c >> 12) & 0x3F);
	p[3] = 0x80 + ((c >> 6) & 0x3F);
	p[4] = 0x80 + (c & 0x3F);
	p += 5;
    }
    else if (c <= 0x7FFFFFFF)
    {
	p[0] = 0xFC + (c >> 30);
	p[1] = 0x80 + ((c >> 24) & 0x3F);
	p[2] = 0x80 + ((c >> 18) & 0x3F);
	p[3] = 0x80 + ((c >> 12) & 0x3F);
	p[4] = 0x80 + ((c >> 6) & 0x3F);
	p[5] = 0x80 + (c & 0x3F);
	p += 6;
    }
    else
	assert(0);		// not a UCS-4 character
    return p;
}

hash_t Dchar::calcHash(const dchar *str, size_t len)
{
    hash_t hash = 0;

    while (1)
    {
	switch (len)
	{
	    case 0:
		return hash;

	    case 1:
		hash *= 37;
		hash += *(const uint8_t *)str;
		return hash;

	    case 2:
		hash *= 37;
#if __I86__
		hash += *(const uint16_t *)str;
#else
		hash += str[0] * 256 + str[1];
#endif
		return hash;

	    case 3:
		hash *= 37;
#if __I86__
		hash += (*(const uint16_t *)str << 8) +
			((const uint8_t *)str)[2];
#else
		hash += (str[0] * 256 + str[1]) * 256 + str[2];
#endif
		return hash;

	    default:
		hash *= 37;
#if __I86__
		hash += *(const uint32_t *)str;
#else
		hash += ((str[0] * 256 + str[1]) * 256 + str[2]) * 256 + str[3];
#endif

		str += 4;
		len -= 4;
		break;
	}
    }
}

#else // ascii

hash_t Dchar::calcHash(const dchar *str, size_t len)
{
    hash_t hash = 0;

    while (1)
    {
	switch (len)
	{
	    case 0:
		return hash;

	    case 1:
		hash *= 37;
		hash += *(const uint8_t *)str;
		return hash;

	    case 2:
		hash *= 37;
#if __I86__
		hash += *(const uint16_t *)str;
#else
		hash += str[0] * 256 + str[1];
#endif
		return hash;

	    case 3:
		hash *= 37;
#if __I86__
		hash += (*(const uint16_t *)str << 8) +
			((const uint8_t *)str)[2];
#else
		hash += (str[0] * 256 + str[1]) * 256 + str[2];
#endif
		return hash;

	    default:
		hash *= 37;
#if __I86__
		hash += *(const uint32_t *)str;
#else
		hash += ((str[0] * 256 + str[1]) * 256 + str[2]) * 256 + str[3];
#endif
		str += 4;
		len -= 4;
		break;
	}
    }
}

hash_t Dchar::icalcHash(const dchar *str, size_t len)
{
    hash_t hash = 0;

    while (1)
    {
	switch (len)
	{
	    case 0:
		return hash;

	    case 1:
		hash *= 37;
		hash += *(const uint8_t *)str | 0x20;
		return hash;

	    case 2:
		hash *= 37;
		hash += *(const uint16_t *)str | 0x2020;
		return hash;

	    case 3:
		hash *= 37;
		hash += ((*(const uint16_t *)str << 8) +
			 ((const uint8_t *)str)[2]) | 0x202020;
		return hash;

	    default:
		hash *= 37;
		hash += *(const uint32_t *)str | 0x20202020;
		str += 4;
		len -= 4;
		break;
	}
    }
}

#endif

#if 0
#include <stdio.h>

void main()
{
    // Print out values to hardcode into Dchar::mblen[]
    int c;
    int s;

    for (c = 0; c < 256; c++)
    {
	s = 1;
	if (c >= 0xC0 && c <= 0xDF)
	    s = 2;
	if (c >= 0xE0 && c <= 0xEF)
	    s = 3;
	if (c >= 0xF0 && c <= 0xF7)
	    s = 4;
	if (c >= 0xF8 && c <= 0xFB)
	    s = 5;
	if (c >= 0xFC && c <= 0xFD)
	    s = 6;

	printf("%d", s);
	if ((c & 15) == 15)
	    printf(",\n");
	else
	    printf(",");
    }
}
#endif