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// Win32-specific support for sections.
// Copyright (C) 2019-2020 Free Software Foundation, Inc.
// GCC is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3, or (at your option) any later
// version.
// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
module gcc.sections.win32;
version (CRuntime_DigitalMars):
// debug = PRINTF;
debug(PRINTF) import core.stdc.stdio;
import rt.minfo;
import core.stdc.stdlib : malloc, free;
struct SectionGroup
{
static int opApply(scope int delegate(ref SectionGroup) dg)
{
return dg(_sections);
}
static int opApplyReverse(scope int delegate(ref SectionGroup) dg)
{
return dg(_sections);
}
@property immutable(ModuleInfo*)[] modules() const nothrow @nogc
{
return _moduleGroup.modules;
}
@property ref inout(ModuleGroup) moduleGroup() inout nothrow @nogc
{
return _moduleGroup;
}
@property inout(void[])[] gcRanges() inout nothrow @nogc
{
return _gcRanges[];
}
private:
ModuleGroup _moduleGroup;
void[][] _gcRanges;
}
shared(bool) conservative;
void initSections() nothrow @nogc
{
_sections._moduleGroup = ModuleGroup(getModuleInfos());
import rt.sections;
conservative = !scanDataSegPrecisely();
if (conservative)
{
_sections._gcRanges = (cast(void[]*) malloc(2 * (void[]).sizeof))[0..2];
auto databeg = cast(void*)&_xi_a;
auto dataend = cast(void*)_moduleinfo_array.ptr;
_sections._gcRanges[0] = databeg[0 .. dataend - databeg];
// skip module info and CONST segment
auto bssbeg = cast(void*)&_edata;
auto bssend = cast(void*)&_end;
_sections._gcRanges[1] = bssbeg[0 .. bssend - bssbeg];
}
else
{
size_t count = &_DPend - &_DPbegin;
auto ranges = cast(void[]*) malloc(count * (void[]).sizeof);
size_t r = 0;
void* prev = null;
for (size_t i = 0; i < count; i++)
{
void* addr = (&_DPbegin)[i];
if (prev + (void*).sizeof == addr)
ranges[r-1] = ranges[r-1].ptr[0 .. ranges[r-1].length + (void*).sizeof];
else
ranges[r++] = (cast(void**)addr)[0..1];
prev = addr;
}
_sections._gcRanges = ranges[0..r];
}
}
void finiSections() nothrow @nogc
{
free(_sections._gcRanges.ptr);
}
void[] initTLSRanges() nothrow @nogc
{
auto pbeg = cast(void*)&_tlsstart;
auto pend = cast(void*)&_tlsend;
return pbeg[0 .. pend - pbeg];
}
void finiTLSRanges(void[] rng) nothrow @nogc
{
}
void scanTLSRanges(void[] rng, scope void delegate(void* pbeg, void* pend) nothrow dg) nothrow
{
if (conservative)
{
dg(rng.ptr, rng.ptr + rng.length);
}
else
{
for (auto p = &_TPbegin; p < &_TPend; )
{
uint beg = *p++;
uint end = beg + cast(uint)((void*).sizeof);
while (p < &_TPend && *p == end)
{
end += (void*).sizeof;
p++;
}
dg(rng.ptr + beg, rng.ptr + end);
}
}
}
private:
__gshared SectionGroup _sections;
// Windows: this gets initialized by minit.asm
extern(C) __gshared immutable(ModuleInfo*)[] _moduleinfo_array;
extern(C) void _minit() nothrow @nogc;
immutable(ModuleInfo*)[] getModuleInfos() nothrow @nogc
out (result)
{
foreach (m; result)
assert(m !is null);
}
body
{
// _minit directly alters the global _moduleinfo_array
_minit();
return _moduleinfo_array;
}
extern(C)
{
extern __gshared
{
int _xi_a; // &_xi_a just happens to be start of data segment
int _edata; // &_edata is start of BSS segment
int _end; // &_end is past end of BSS
void* _DPbegin; // first entry in the array of pointers addresses
void* _DPend; // &_DPend points after last entry of array
uint _TPbegin; // first entry in the array of TLS offsets of pointers
uint _TPend; // &_DPend points after last entry of array
}
extern
{
int _tlsstart;
int _tlsend;
}
}
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