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libsysprof-analyze: kallsyms constructor with provided file

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This allows parsing a kallsyms file that is provided by the application.
Such use could be necessary if a capture did not embed /proc/kallsyms.gz.
This commit is contained in:
Christian Hergert
2023-05-23 11:03:34 -07:00
parent fd69b1051c
commit b2a48fe38d
2 changed files with 55 additions and 15 deletions
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62
src/libsysprof-analyze/sysprof-kallsyms-symbolizer.c
View File

@ -39,6 +39,7 @@ typedef struct _KernelSymbol
struct _SysprofKallsymsSymbolizer
{
SysprofSymbolizer parent_instance;
GInputStream *stream;
GArray *kallsyms;
guint64 low;
guint64 high;
@ -202,22 +203,32 @@ sysprof_kallsyms_symbolizer_prepare_async (SysprofSymbolizer *symbolizer,
task = g_task_new (self, cancellable, callback, user_data);
g_task_set_source_tag (task, sysprof_kallsyms_symbolizer_prepare_async);
if (!(file = sysprof_document_lookup_file (document, "/proc/kallsyms.gz")))
if (self->stream == NULL)
{
g_task_return_new_error (task,
G_IO_ERROR,
G_IO_ERROR_NOT_SUPPORTED,
"No kallsyms found to decode");
return;
if (!(file = sysprof_document_lookup_file (document, "/proc/kallsyms.gz")))
{
g_task_return_new_error (task,
G_IO_ERROR,
G_IO_ERROR_NOT_SUPPORTED,
"No kallsyms found to decode");
return;
}
decompressor = g_zlib_decompressor_new (G_ZLIB_COMPRESSOR_FORMAT_GZIP);
input_gz = sysprof_document_file_read (file);
input = g_converter_input_stream_new (input_gz, G_CONVERTER (decompressor));
g_task_set_task_data (task,
g_data_input_stream_new (input),
g_object_unref);
}
else
{
g_task_set_task_data (task,
g_steal_pointer (&self->stream),
g_object_unref);
}
decompressor = g_zlib_decompressor_new (G_ZLIB_COMPRESSOR_FORMAT_GZIP);
input_gz = sysprof_document_file_read (file);
input = g_converter_input_stream_new (input_gz, G_CONVERTER (decompressor));
g_task_set_task_data (task,
g_data_input_stream_new (input),
g_object_unref);
g_task_run_in_thread (task, sysprof_kallsyms_symbolizer_prepare_worker);
}
@ -332,3 +343,28 @@ sysprof_kallsyms_symbolizer_new (void)
{
return g_object_new (SYSPROF_TYPE_KALLSYMS_SYMBOLIZER, NULL);
}
/**
* sysprof_kallsyms_symbolizer_new_for_symbols:
* @symbols: (transfer full): a #GInputStream
*
* Creates a symbolizer using the contents of @symbols as the contents
* of `/proc/kallsyms` for decoding. This is useful if you need to unwind
* symbols from a machine that is different than where the capture was
* recorded and have not embedded `/proc/kallsyms.gz` within the capture
* file for use by #SysprofKallsymsSymbolizer.
*
* Returns: (transfer full): a #SysprofKallsymsSymbolizer
*/
SysprofSymbolizer *
sysprof_kallsyms_symbolizer_new_for_symbols (GInputStream *symbols)
{
SysprofKallsymsSymbolizer *self;
g_return_val_if_fail (G_IS_INPUT_STREAM (symbols), NULL);
self = g_object_new (SYSPROF_TYPE_KALLSYMS_SYMBOLIZER, NULL);
self->stream = symbols;
return SYSPROF_SYMBOLIZER (self);
}

8
src/libsysprof-analyze/sysprof-kallsyms-symbolizer.h
View File

@ -20,6 +20,8 @@
#pragma once
#include <gio/gio.h>
#include "sysprof-symbolizer.h"
G_BEGIN_DECLS
@ -33,9 +35,11 @@ typedef struct _SysprofKallsymsSymbolizer SysprofKallsymsSymbolizer;
typedef struct _SysprofKallsymsSymbolizerClass SysprofKallsymsSymbolizerClass;
SYSPROF_AVAILABLE_IN_ALL
GType sysprof_kallsyms_symbolizer_get_type (void) G_GNUC_CONST;
GType sysprof_kallsyms_symbolizer_get_type (void) G_GNUC_CONST;
SYSPROF_AVAILABLE_IN_ALL
SysprofSymbolizer *sysprof_kallsyms_symbolizer_new (void);
SysprofSymbolizer *sysprof_kallsyms_symbolizer_new (void);
SYSPROF_AVAILABLE_IN_ALL
SysprofSymbolizer *sysprof_kallsyms_symbolizer_new_for_symbols (GInputStream *symbols);
G_DEFINE_AUTOPTR_CLEANUP_FUNC (SysprofKallsymsSymbolizer, g_object_unref)