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libsysprof: decode and supplement kernel symbols

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This commit is contained in:
Christian Hergert
2019-05-28 13:55:27 -07:00
parent 1f91bc77ed
commit 3b3011544b
1 changed files with 29 additions and 13 deletions
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42
src/libsysprof/sysprof-symbols-source.c
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@ -23,6 +23,7 @@
#include "config.h"
#include "sysprof-elf-symbol-resolver.h"
#include "sysprof-private.h"
#include "sysprof-symbols-source.h"
#include "sysprof-platform.h"
@ -123,10 +124,12 @@ sysprof_symbols_source_supplement (SysprofSource *source,
{
SysprofSymbolsSource *self = (SysprofSymbolsSource *)source;
g_autoptr(SysprofSymbolResolver) native = NULL;
g_autoptr(SysprofKernelSymbols) kernel = NULL;
g_autoptr(GByteArray) strings = NULL;
g_autoptr(GHashTable) seen = NULL;
g_autoptr(GSequence) symbols = NULL;
SysprofCaptureFrameType type;
GQuark kquark;
guint base;
gint fd = -1;
@ -137,6 +140,9 @@ sysprof_symbols_source_supplement (SysprofSource *source,
if (-1 == (fd = sysprof_memfd_create ("[sysprof-decode]")))
return;
kquark = g_quark_from_static_string ("Kernel");
kernel = _sysprof_kernel_symbols_ref_shared ();
strings = g_byte_array_new ();
symbols = g_sequence_new ((GDestroyNotify) symbol_free);
seen = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
@ -161,6 +167,7 @@ sysprof_symbols_source_supplement (SysprofSource *source,
for (guint i = 0; i < sample->n_addrs; i++)
{
g_autofree gchar *str = NULL;
const SysprofKernelSymbol *ksym;
SysprofCaptureAddress addr = sample->addrs[i];
SysprofCaptureAddress begin, end;
SysprofAddressContext context;
@ -176,25 +183,34 @@ sysprof_symbols_source_supplement (SysprofSource *source,
continue;
}
if (!sysprof_elf_symbol_resolver_resolve_full ((SysprofElfSymbolResolver *)native,
sample->frame.time,
sample->frame.pid,
last_context,
addr,
&begin,
&end,
&str,
&tag))
continue;
g_assert (str != NULL);
sym.pid = sample->frame.pid;
sym.begin = begin;
sym.end = end;
sym.offset = 0;
sym.tag_offset = 0;
if ((ksym = _sysprof_kernel_symbols_lookup (kernel, addr)))
{
str = g_strdup (ksym->name);
begin = ksym->address;
tag = kquark;
/* The symols array always has a trailing node that is empty */
end = (ksym + 1)->address;
}
else if (!sysprof_elf_symbol_resolver_resolve_full ((SysprofElfSymbolResolver *)native,
sample->frame.time,
sample->frame.pid,
last_context,
addr,
&begin,
&end,
&str,
&tag))
continue;
g_assert (str != NULL);
/* Lookup (but get us the next position on miss so we can insert
* without a second lookup for the same position.
*/