forked from Minki/linux
2a9c8c3609
Add lazy line matching support for specifying new probes. This also changes the syntax of perf probe a bit. Now perf probe accepts one of below probe event definitions. 1) Define event based on function name [EVENT=]FUNC[@SRC][:RLN|+OFF|%return|;PTN] [ARG ...] 2) Define event based on source file with line number [EVENT=]SRC:ALN [ARG ...] 3) Define event based on source file with lazy pattern [EVENT=]SRC;PTN [ARG ...] - New lazy matching pattern(PTN) follows ';' (semicolon). And it must be put the end of the definition. - So, @SRC is no longer the part which must be put at the end of the definition. Note that ';' (semicolon) can be interpreted as the end of a command by the shell. This means that you need to quote it. (anyway you will need to quote the lazy pattern itself too, because it may contains other sensitive characters, like '[',']' etc.). Lazy matching ------------- The lazy line matching is similar to glob matching except ignoring spaces in both of pattern and target. e.g. 'a=*' can matches 'a=b', 'a = b', 'a == b' and so on. This provides some sort of flexibility and robustness to probe point definitions against minor code changes. (for example, actual 10th line of schedule() can be changed easily by modifying schedule(), but the same line matching 'rq=cpu_rq*' may still exist.) Changes in v3: - Cast Dwarf_Addr to uintmax_t for printf-formats. Changes in v2: - Cast Dwarf_Addr to unsigned long long for printf-formats. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Mike Galbraith <efault@gmx.de> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> LKML-Reference: <20100225133611.6725.45078.stgit@localhost6.localdomain6> Signed-off-by: Ingo Molnar <mingo@elte.hu>
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
#ifndef _PROBE_FINDER_H
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#define _PROBE_FINDER_H
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#include <stdbool.h>
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#include "util.h"
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#define MAX_PATH_LEN 256
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#define MAX_PROBE_BUFFER 1024
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#define MAX_PROBES 128
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static inline int is_c_varname(const char *name)
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{
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/* TODO */
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return isalpha(name[0]) || name[0] == '_';
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}
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struct probe_point {
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char *event; /* Event name */
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char *group; /* Event group */
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/* Inputs */
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char *file; /* File name */
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int line; /* Line number */
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char *lazy_line; /* Lazy line pattern */
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char *function; /* Function name */
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int offset; /* Offset bytes */
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int nr_args; /* Number of arguments */
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char **args; /* Arguments */
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int retprobe; /* Return probe */
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/* Output */
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int found; /* Number of found probe points */
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char *probes[MAX_PROBES]; /* Output buffers (will be allocated)*/
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};
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/* Line number container */
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struct line_node {
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struct list_head list;
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unsigned int line;
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};
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/* Line range */
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struct line_range {
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char *file; /* File name */
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char *function; /* Function name */
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unsigned int start; /* Start line number */
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unsigned int end; /* End line number */
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int offset; /* Start line offset */
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char *path; /* Real path name */
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struct list_head line_list; /* Visible lines */
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};
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#ifndef NO_DWARF_SUPPORT
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extern int find_probe_point(int fd, struct probe_point *pp);
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extern int find_line_range(int fd, struct line_range *lr);
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#include <dwarf.h>
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#include <libdw.h>
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struct probe_finder {
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struct probe_point *pp; /* Target probe point */
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/* For function searching */
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Dwarf_Addr addr; /* Address */
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const char *fname; /* File name */
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int lno; /* Line number */
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Dwarf_Die cu_die; /* Current CU */
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/* For variable searching */
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Dwarf_Op *fb_ops; /* Frame base attribute */
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Dwarf_Addr cu_base; /* Current CU base address */
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const char *var; /* Current variable name */
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char *buf; /* Current output buffer */
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int len; /* Length of output buffer */
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struct list_head lcache; /* Line cache for lazy match */
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};
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struct line_finder {
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struct line_range *lr; /* Target line range */
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const char *fname; /* File name */
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int lno_s; /* Start line number */
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int lno_e; /* End line number */
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Dwarf_Die cu_die; /* Current CU */
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int found;
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};
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#endif /* NO_DWARF_SUPPORT */
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#endif /*_PROBE_FINDER_H */
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