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arrayassign.d
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arrayassign.d
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/**
* Implementation of array assignment support routines.
*
* Copyright: Copyright Digital Mars 2000 - 2010.
* License: <a href="http://www.boost.org/LICENSE_1_0.txt">Boost License 1.0</a>.
* Authors: Walter Bright
*/
/* Copyright Digital Mars 2000 - 2010.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*/
module rt.arrayassign;
private
{
import rt.util.string;
import core.stdc.string;
import core.stdc.stdlib;
debug(PRINTF) import core.stdc.stdio;
}
/**
* Does array assignment (not construction) from another
* array of the same element type.
* ti is the element type.
* Handles overlapping copies.
*/
extern (C) void[] _d_arrayassign(TypeInfo ti, void[] from, void[] to)
{
debug(PRINTF) printf("_d_arrayassign(from = %p,%d, to = %p,%d) size = %d\n", from.ptr, from.length, to.ptr, to.length, ti.tsize);
if (to.length != from.length)
{
char[10] tmp1 = void;
char[10] tmp2 = void;
string msg = "lengths don't match for array copy, "c;
msg ~= tmp1.uintToString(to.length) ~ " = " ~ tmp2.uintToString(from.length);
throw new Error(msg);
}
auto element_size = ti.tsize;
/* Need a temporary buffer tmp[] big enough to hold one element
*/
void[16] buf = void;
void[] tmp;
if (element_size > buf.sizeof)
tmp = alloca(element_size)[0 .. element_size];
else
tmp = buf[];
if (to.ptr <= from.ptr)
{
foreach (i; 0 .. to.length)
{
void* pto = to.ptr + i * element_size;
void* pfrom = from.ptr + i * element_size;
memcpy(tmp.ptr, pto, element_size);
memcpy(pto, pfrom, element_size);
ti.postblit(pto);
ti.destroy(tmp.ptr);
}
}
else
{
for (auto i = to.length; i--; )
{
void* pto = to.ptr + i * element_size;
void* pfrom = from.ptr + i * element_size;
memcpy(tmp.ptr, pto, element_size);
memcpy(pto, pfrom, element_size);
ti.postblit(pto);
ti.destroy(tmp.ptr);
}
}
return to;
}
/**
* Does array initialization (not assignment) from another
* array of the same element type.
* ti is the element type.
*/
extern (C) void[] _d_arrayctor(TypeInfo ti, void[] from, void[] to)
{
debug(PRINTF) printf("_d_arrayctor(from = %p,%d, to = %p,%d) size = %d\n", from.ptr, from.length, to.ptr, to.length, ti.tsize);
if (to.length != from.length)
{
char[10] tmp = void;
string msg = "lengths don't match for array initialization,"c;
msg ~= tmp.uintToString(to.length) ~ " = " ~ tmp.uintToString(from.length);
throw new Error(msg);
}
auto element_size = ti.tsize;
size_t i;
try
{
for (i = 0; i < to.length; i++)
{
// Copy construction is defined as bit copy followed by postblit.
memcpy(to.ptr + i * element_size, from.ptr + i * element_size, element_size);
ti.postblit(to.ptr + i * element_size);
}
}
catch (Throwable o)
{
/* Destroy, in reverse order, what we've constructed so far
*/
while (i--)
{
ti.destroy(to.ptr + i * element_size);
}
throw o;
}
return to;
}
/**
* Do assignment to an array.
* p[0 .. count] = value;
*/
extern (C) void* _d_arraysetassign(void* p, void* value, int count, TypeInfo ti)
{
void* pstart = p;
auto element_size = ti.tsize;
//Need a temporary buffer tmp[] big enough to hold one element
void[16] buf = void;
void[] tmp;
if (element_size > buf.sizeof)
{
tmp = alloca(element_size)[0 .. element_size];
}
else
tmp = buf[];
foreach (i; 0 .. count)
{
memcpy(tmp.ptr, p, element_size);
memcpy(p, value, element_size);
ti.postblit(p);
ti.destroy(tmp.ptr);
p += element_size;
}
return pstart;
}
/**
* Do construction of an array.
* ti[count] p = value;
*/
extern (C) void* _d_arraysetctor(void* p, void* value, int count, TypeInfo ti)
{
void* pstart = p;
auto element_size = ti.tsize;
try
{
foreach (i; 0 .. count)
{
// Copy construction is defined as bit copy followed by postblit.
memcpy(p, value, element_size);
ti.postblit(p);
p += element_size;
}
}
catch (Throwable o)
{
// Destroy, in reverse order, what we've constructed so far
while (p > pstart)
{
p -= element_size;
ti.destroy(p);
}
throw o;
}
return pstart;
}