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unwind-dw2-fde-glibc.c (struct unw_eh_callback_data.check_cache): New field.

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2005-03-04  Andrew Haley  <aph@redhat.com>

        * unwind-dw2-fde-glibc.c (struct
        unw_eh_callback_data.check_cache): New field.
        (frame_hdr_cache): New.
        (_Unwind_IteratePhdrCallback): Add ext_dl_phdr_info.
        Cache frame header info.

From-SVN: r95894
This commit is contained in:
Andrew Haley 2005-03-04 19:54:16 +00:00 committed by Andrew Haley
parent 37e860a298
commit b120f3b75c
2 changed files with 138 additions and 7 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2005-03-04 Andrew Haley <aph@redhat.com>
* unwind-dw2-fde-glibc.c (struct
unw_eh_callback_data.check_cache): New field.
(frame_hdr_cache): New.
(_Unwind_IteratePhdrCallback): Add ext_dl_phdr_info.
Cache frame header info.
2005-03-04 Richard Sandiford <rsandifo@redhat.com>
* rtl.h (copy_rtx_ptr_loc, print_rtx_ptr_loc, join_c_conditions)

137
gcc/unwind-dw2-fde-glibc.c
View File

@ -74,6 +74,7 @@ struct unw_eh_callback_data
void *dbase;
void *func;
const fde *ret;
int check_cache;
};
struct unw_eh_frame_hdr
@ -84,6 +85,20 @@ struct unw_eh_frame_hdr
unsigned char table_enc;
};
#define FRAME_HDR_CACHE_SIZE 8
static struct frame_hdr_cache_element
{
_Unwind_Ptr pc_low;
_Unwind_Ptr pc_high;
_Unwind_Ptr load_base;
const ElfW(Phdr) *p_eh_frame_hdr;
const ElfW(Phdr) *p_dynamic;
struct frame_hdr_cache_element *link;
} frame_hdr_cache[FRAME_HDR_CACHE_SIZE];
static struct frame_hdr_cache_element *frame_hdr_cache_head;
/* Like base_of_encoded_value, but take the base from a struct
unw_eh_callback_data instead of an _Unwind_Context. */
@ -123,11 +138,16 @@ _Unwind_IteratePhdrCallback (struct dl_phdr_info *info, size_t size, void *ptr)
const struct unw_eh_frame_hdr *hdr;
_Unwind_Ptr eh_frame;
struct object ob;
/* Make sure struct dl_phdr_info is at least as big as we need. */
if (size < offsetof (struct dl_phdr_info, dlpi_phnum)
+ sizeof (info->dlpi_phnum))
return -1;
struct ext_dl_phdr_info
{
ElfW(Addr) dlpi_addr;
const char *dlpi_name;
const ElfW(Phdr) *dlpi_phdr;
ElfW(Half) dlpi_phnum;
unsigned long long int dlpi_adds;
unsigned long long int dlpi_subs;
};
match = 0;
phdr = info->dlpi_phdr;
@ -135,6 +155,82 @@ _Unwind_IteratePhdrCallback (struct dl_phdr_info *info, size_t size, void *ptr)
p_eh_frame_hdr = NULL;
p_dynamic = NULL;
struct frame_hdr_cache_element *prev_cache_entry = NULL,
*last_cache_entry = NULL;
if (data->check_cache && size >= sizeof (struct ext_dl_phdr_info))
{
static unsigned long long adds = -1ULL, subs;
struct ext_dl_phdr_info *einfo = (struct ext_dl_phdr_info *) info;
/* We use a least recently used cache replacement policy. Also,
the most recently used cache entries are placed at the head
of the search chain. */
if (einfo->dlpi_adds == adds && einfo->dlpi_subs == subs)
{
/* Find data->pc in shared library cache.
Set load_base, p_eh_frame_hdr and p_dynamic
plus match from the cache and goto
"Read .eh_frame_hdr header." below. */
struct frame_hdr_cache_element *cache_entry;
for (cache_entry = frame_hdr_cache_head;
cache_entry;
cache_entry = cache_entry->link)
{
if (data->pc >= cache_entry->pc_low
&& data->pc < cache_entry->pc_high)
{
load_base = cache_entry->load_base;
p_eh_frame_hdr = cache_entry->p_eh_frame_hdr;
p_dynamic = cache_entry->p_dynamic;
/* And move the entry we're using to the head. */
if (cache_entry != frame_hdr_cache_head)
{
prev_cache_entry->link = cache_entry->link;
cache_entry->link = frame_hdr_cache_head;
frame_hdr_cache_head = cache_entry;
}
goto found;
}
last_cache_entry = cache_entry;
/* Exit early if we found an unused entry. */
if ((cache_entry->pc_low | cache_entry->pc_high) == 0)
break;
if (cache_entry->link != NULL)
prev_cache_entry = cache_entry;
}
}
else
{
adds = einfo->dlpi_adds;
subs = einfo->dlpi_subs;
/* Initialize the cache. Create a chain of cache entries,
with the final one terminated by a NULL link. */
int i;
for (i = 0; i < FRAME_HDR_CACHE_SIZE; i++)
{
frame_hdr_cache[i].pc_low = 0;
frame_hdr_cache[i].pc_high = 0;
frame_hdr_cache[i].link = &frame_hdr_cache[i+1];
}
frame_hdr_cache[i-1].link = NULL;
frame_hdr_cache_head = &frame_hdr_cache[0];
data->check_cache = 0;
}
}
/* Make sure struct dl_phdr_info is at least as big as we need. */
if (size < offsetof (struct dl_phdr_info, dlpi_phnum)
+ sizeof (info->dlpi_phnum))
return -1;
_Unwind_Ptr pc_low = 0, pc_high = 0;
/* See if PC falls into one of the loaded segments. Find the eh_frame
segment at the same time. */
for (n = info->dlpi_phnum; --n >= 0; phdr++)
@ -144,14 +240,40 @@ _Unwind_IteratePhdrCallback (struct dl_phdr_info *info, size_t size, void *ptr)
_Unwind_Ptr vaddr = (_Unwind_Ptr)
__RELOC_POINTER (phdr->p_vaddr, load_base);
if (data->pc >= vaddr && data->pc < vaddr + phdr->p_memsz)
match = 1;
{
match = 1;
pc_low = vaddr;
pc_high = vaddr + phdr->p_memsz;
}
}
else if (phdr->p_type == PT_GNU_EH_FRAME)
p_eh_frame_hdr = phdr;
else if (phdr->p_type == PT_DYNAMIC)
p_dynamic = phdr;
}
if (!match || !p_eh_frame_hdr)
if (!match)
return 0;
if (size >= sizeof (struct ext_dl_phdr_info))
{
if (last_cache_entry != NULL)
{
prev_cache_entry->link = last_cache_entry->link;
last_cache_entry->link = frame_hdr_cache_head;
frame_hdr_cache_head = last_cache_entry;
}
frame_hdr_cache_head->load_base = load_base;
frame_hdr_cache_head->p_eh_frame_hdr = p_eh_frame_hdr;
frame_hdr_cache_head->p_dynamic = p_dynamic;
frame_hdr_cache_head->pc_low = pc_low;
frame_hdr_cache_head->pc_high = pc_high;
}
found:
if (!p_eh_frame_hdr)
return 0;
/* Read .eh_frame_hdr header. */
@ -289,6 +411,7 @@ _Unwind_Find_FDE (void *pc, struct dwarf_eh_bases *bases)
data.dbase = NULL;
data.func = NULL;
data.ret = NULL;
data.check_cache = 1;
if (dl_iterate_phdr (_Unwind_IteratePhdrCallback, &data) < 0)
return NULL;