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* dll_init.cc: Throughout, drop usage of modname in favor of name.

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(dll_list::find_by_modname): Remove.
	(dll_list::alloc): Only store module basename in name.  Add comment to
	explain why.  Simplify address check.  Fix formatting in comment.
	* dll_init.h (struct dll): Drop modname and find_by_modname.
This commit is contained in:
Corinna Vinschen 2012-02-08 17:35:02 +00:00
parent 25e67cd634
commit 8f4ea5f005
3 changed files with 37 additions and 50 deletions
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8
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,11 @@
2012-02-08 Corinna Vinschen <corinna@vinschen.de>
* dll_init.cc: Throughout, drop usage of modname in favor of name.
(dll_list::find_by_modname): Remove.
(dll_list::alloc): Only store module basename in name. Add comment to
explain why. Simplify address check. Fix formatting in comment.
* dll_init.h (struct dll): Drop modname and find_by_modname.
2012-02-08 Corinna Vinschen <corinna@vinschen.de>
* dll_init.cc (dll_list::alloc): Add DLL name to fabort output. Fix

77
winsup/cygwin/dll_init.cc
View File

@ -1,7 +1,7 @@
/* dll_init.cc
Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
2007, 2008, 2009, 2010, 2011 Red Hat, Inc.
2007, 2008, 2009, 2010, 2011, 2012 Red Hat, Inc.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
@ -118,26 +118,22 @@ dll_list::operator[] (const PWCHAR name)
return NULL;
}
/* Look for a dll based on is short name only (no path) */
dll *
dll_list::find_by_modname (const PWCHAR name)
{
dll *d = &start;
while ((d = d->next) != NULL)
if (!wcscasecmp (name, d->modname))
return d;
return NULL;
}
#define RETRIES 1000
/* Allocate space for a dll struct. */
dll *
dll_list::alloc (HINSTANCE h, per_process *p, dll_type type)
{
WCHAR name[NT_MAX_PATH];
DWORD namelen = GetModuleFileNameW (h, name, sizeof (name));
/* Only use and compare basenames for DLLs. Per MSDN, the Windows loader
re-uses the already loaded DLL, if the new DLL has the same basename
as the already loaded DLL. It will not try to load the new DLL at all.
See http://msdn.microsoft.com/en-us/library/ms682586%28v=vs.85%29.aspx
Use GetModuleFileNameW + wcsrchr rather than GetModuleBaseNameW since
it's faster per MSDN, and it doesn't require to link against psapi. */
WCHAR buf[NT_MAX_PATH];
GetModuleFileNameW (h, buf, sizeof (buf));
PWCHAR name = wcsrchr (buf, L'\\') + 1;
DWORD namelen = wcslen (name);
guard (true);
/* Already loaded? */
@ -146,21 +142,9 @@ dll_list::alloc (HINSTANCE h, per_process *p, dll_type type)
{
if (!in_forkee)
d->count++; /* Yes. Bump the usage count. */
else
{
if (d->p.data_start != p->data_start)
fabort ("%W: data segment start: parent(%p) != child(%p)",
name, d->p.data_start, p->data_start);
else if (d->p.data_end != p->data_end)
fabort ("%W: data segment end: parent(%p) != child(%p)",
name, d->p.data_end, p->data_end);
else if (d->p.bss_start != p->bss_start)
fabort ("%W: bss segment start: parent(%p) != child(%p)",
name, d->p.bss_start, p->bss_start);
else if (d->p.bss_end != p->bss_end)
fabort ("%W: bss segment end: parent(%p) != child(%p)",
name, d->p.bss_end, p->bss_end);
}
else if (d->handle != h)
fabort ("%W: Loaded to different address: parent(%p) != child(%p)",
name, d->handle, h);
d->p = p;
}
else
@ -168,8 +152,8 @@ dll_list::alloc (HINSTANCE h, per_process *p, dll_type type)
/* FIXME: Change this to new at some point. */
d = (dll *) cmalloc (HEAP_2_DLL, sizeof (*d) + (namelen * sizeof (*name)));
/* Now we've allocated a block of information. Fill it in with the supplied
info about this DLL. */
/* Now we've allocated a block of information. Fill it in with the
supplied info about this DLL. */
d->count = 1;
wcscpy (d->name, name);
d->handle = h;
@ -177,9 +161,6 @@ dll_list::alloc (HINSTANCE h, per_process *p, dll_type type)
d->p = p;
d->ndeps = 0;
d->deps = NULL;
d->modname = wcsrchr (d->name, L'\\');
if (d->modname)
d->modname++;
d->image_size = ((pefile*)h)->optional_hdr ()->SizeOfImage;
d->preferred_base = (void*) ((pefile*)h)->optional_hdr()->ImageBase;
d->type = type;
@ -220,7 +201,7 @@ void dll_list::populate_deps (dll* d)
{
char* modname = pef->rva (id->Name);
sys_mbstowcs (wmodname, NT_MAX_PATH, modname);
if (dll* dep = find_by_modname (wmodname))
if (dll* dep = dlls[wmodname])
{
if (d->ndeps >= maxdeps)
{
@ -259,9 +240,9 @@ dll_list::topsort ()
while ((d = d->next))
{
#ifdef DEBUGGING
paranoid_printf ("%W", d->modname);
paranoid_printf ("%W", d->name);
for (int i = 1; i < -d->ndeps; i++)
paranoid_printf ("-> %W", d->deps[i - 1]->modname);
paranoid_printf ("-> %W", d->deps[i - 1]->name);
#endif
/* It would be really nice to be able to keep this information
@ -428,7 +409,7 @@ dll_list::reserve_space ()
for (dll* d = dlls.istart (DLL_LOAD); d; d = dlls.inext ())
if (!VirtualAlloc (d->handle, d->image_size, MEM_RESERVE, PAGE_NOACCESS))
fabort ("address space needed by '%W' (%p) is already occupied",
d->modname, d->handle);
d->name, d->handle);
}
/* Reload DLLs after a fork. Iterates over the list of dynamically loaded
@ -474,7 +455,7 @@ void dll_list::load_after_fork_impl (HANDLE parent, dll* d, int retries)
*/
if (!retries && !VirtualFree (d->handle, 0, MEM_RELEASE))
fabort ("unable to release protective reservation for %W (%08lx), %E",
d->modname, d->handle);
d->name, d->handle);
HMODULE h = LoadLibraryExW (d->name, NULL, DONT_RESOLVE_DLL_REFERENCES);
if (!h)
@ -483,24 +464,24 @@ void dll_list::load_after_fork_impl (HANDLE parent, dll* d, int retries)
if (h != d->handle)
{
sigproc_printf ("%W loaded in wrong place: %08lx != %08lx",
d->modname, h, d->handle);
d->name, h, d->handle);
FreeLibrary (h);
DWORD reservation = reserve_at (d->modname, (DWORD) h,
DWORD reservation = reserve_at (d->name, (DWORD) h,
(DWORD) d->handle, d->image_size);
if (!reservation)
fabort ("unable to block off %p to prevent %W from loading there",
h, d->modname);
h, d->name);
if (retries < DLL_RETRY_MAX)
load_after_fork_impl (parent, d, retries+1);
else
fabort ("unable to remap %W to same address as parent (%08lx) - try running rebaseall",
d->modname, d->handle);
d->name, d->handle);
/* once the above returns all the dlls are mapped; release
the reservation and continue unwinding */
sigproc_printf ("releasing blocked space at %08lx", reservation);
release_at (d->modname, reservation);
release_at (d->name, reservation);
return;
}
}
@ -516,7 +497,7 @@ void dll_list::load_after_fork_impl (HANDLE parent, dll* d, int retries)
{
if (!VirtualFree (d->handle, 0, MEM_RELEASE))
fabort ("unable to release protective reservation for %W (%08lx), %E",
d->modname, d->handle);
d->name, d->handle);
}
else
{
@ -524,14 +505,14 @@ void dll_list::load_after_fork_impl (HANDLE parent, dll* d, int retries)
to ours or we wouldn't have gotten this far */
if (!FreeLibrary (d->handle))
fabort ("unable to unload interim mapping of %W, %E",
d->modname);
d->name);
}
HMODULE h = LoadLibraryW (d->name);
if (!h)
fabort ("unable to map %W, %E", d->name);
if (h != d->handle)
fabort ("unable to map %W to same address as parent: %p != %p",
d->modname, d->handle, h);
d->name, d->handle, h);
}
}

2
winsup/cygwin/dll_init.h
View File

@ -54,7 +54,6 @@ struct dll
dll_type type;
long ndeps;
dll** deps;
PWCHAR modname;
DWORD image_size;
void* preferred_base;
WCHAR name[1];
@ -90,7 +89,6 @@ public:
void load_after_fork (HANDLE);
void reserve_space ();
void load_after_fork_impl (HANDLE, dll* which, int retries);
dll *find_by_modname (const PWCHAR name);
void populate_deps (dll* d);
void topsort ();
void topsort_visit (dll* d, bool goto_tail);