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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/tools/perf/util/dwarf-aux.c
....@@ -1,28 +1,15 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * dwarf-aux.c : libdw auxiliary interfaces
3
- *
4
- * This program is free software; you can redistribute it and/or modify
5
- * it under the terms of the GNU General Public License as published by
6
- * the Free Software Foundation; either version 2 of the License, or
7
- * (at your option) any later version.
8
- *
9
- * This program is distributed in the hope that it will be useful,
10
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
11
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12
- * GNU General Public License for more details.
13
- *
14
- * You should have received a copy of the GNU General Public License
15
- * along with this program; if not, write to the Free Software
16
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17
- *
184  */
195 
206 #include <errno.h>
217 #include <inttypes.h>
228 #include <stdbool.h>
23
-#include "util.h"
9
+#include <stdlib.h>
2410 #include "debug.h"
2511 #include "dwarf-aux.h"
12
+#include "strbuf.h"
2613 #include "string2.h"
2714 
2815 /**
....@@ -72,6 +59,51 @@
7259 	return dwarf_formstring(&attr);
7360 }
7461 
62
+/* Unlike dwarf_getsrc_die(), cu_getsrc_die() only returns statement line */
63
+static Dwarf_Line *cu_getsrc_die(Dwarf_Die *cu_die, Dwarf_Addr addr)
64
+{
65
+	Dwarf_Addr laddr;
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+	Dwarf_Lines *lines;
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+	Dwarf_Line *line;
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+	size_t nlines, l, u, n;
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+	bool flag;
70
+
71
+	if (dwarf_getsrclines(cu_die, &lines, &nlines) != 0 ||
72
+	    nlines == 0)
73
+		return NULL;
74
+
75
+	/* Lines are sorted by address, use binary search */
76
+	l = 0; u = nlines - 1;
77
+	while (l < u) {
78
+		n = u - (u - l) / 2;
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+		line = dwarf_onesrcline(lines, n);
80
+		if (!line || dwarf_lineaddr(line, &laddr) != 0)
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+			return NULL;
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+		if (addr < laddr)
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+			u = n - 1;
84
+		else
85
+			l = n;
86
+	}
87
+	/* Going backward to find the lowest line */
88
+	do {
89
+		line = dwarf_onesrcline(lines, --l);
90
+		if (!line || dwarf_lineaddr(line, &laddr) != 0)
91
+			return NULL;
92
+	} while (laddr == addr);
93
+	l++;
94
+	/* Going foward to find the statement line */
95
+	do {
96
+		line = dwarf_onesrcline(lines, l++);
97
+		if (!line || dwarf_lineaddr(line, &laddr) != 0 ||
98
+		    dwarf_linebeginstatement(line, &flag) != 0)
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+			return NULL;
100
+		if (laddr > addr)
101
+			return NULL;
102
+	} while (!flag);
103
+
104
+	return line;
105
+}
106
+
75107 /**
76108  * cu_find_lineinfo - Get a line number and file name for given address
77109  * @cu_die: a CU DIE
....@@ -85,17 +117,26 @@
85117 		    const char **fname, int *lineno)
86118 {
87119 	Dwarf_Line *line;
88
-	Dwarf_Addr laddr;
120
+	Dwarf_Die die_mem;
121
+	Dwarf_Addr faddr;
89122 
90
-	line = dwarf_getsrc_die(cu_die, (Dwarf_Addr)addr);
91
-	if (line && dwarf_lineaddr(line, &laddr) == 0 &&
92
-	    addr == (unsigned long)laddr && dwarf_lineno(line, lineno) == 0) {
123
+	if (die_find_realfunc(cu_die, (Dwarf_Addr)addr, &die_mem)
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+	    && die_entrypc(&die_mem, &faddr) == 0 &&
125
+	    faddr == addr) {
126
+		*fname = dwarf_decl_file(&die_mem);
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+		dwarf_decl_line(&die_mem, lineno);
128
+		goto out;
129
+	}
130
+
131
+	line = cu_getsrc_die(cu_die, (Dwarf_Addr)addr);
132
+	if (line && dwarf_lineno(line, lineno) == 0) {
93133 		*fname = dwarf_linesrc(line, NULL, NULL);
94134 		if (!*fname)
95135 			/* line number is useless without filename */
96136 			*lineno = 0;
97137 	}
98138 
139
+out:
99140 	return *lineno ?: -ENOENT;
100141 }
101142 
....@@ -267,21 +308,8 @@
267308 {
268309 	Dwarf_Attribute attr;
269310 
270
-	if (dwarf_attr(tp_die, attr_name, &attr) == NULL ||
311
+	if (dwarf_attr_integrate(tp_die, attr_name, &attr) == NULL ||
271312 	    dwarf_formudata(&attr, result) != 0)
272
-		return -ENOENT;
273
-
274
-	return 0;
275
-}
276
-
277
-/* Get attribute and translate it as a sdata */
278
-static int die_get_attr_sdata(Dwarf_Die *tp_die, unsigned int attr_name,
279
-			      Dwarf_Sword *result)
280
-{
281
-	Dwarf_Attribute attr;
282
-
283
-	if (dwarf_attr(tp_die, attr_name, &attr) == NULL ||
284
-	    dwarf_formsdata(&attr, result) != 0)
285313 		return -ENOENT;
286314 
287315 	return 0;
....@@ -315,9 +343,25 @@
315343 bool die_is_func_def(Dwarf_Die *dw_die)
316344 {
317345 	Dwarf_Attribute attr;
346
+	Dwarf_Addr addr = 0;
318347 
319
-	return (dwarf_tag(dw_die) == DW_TAG_subprogram &&
320
-		dwarf_attr(dw_die, DW_AT_declaration, &attr) == NULL);
348
+	if (dwarf_tag(dw_die) != DW_TAG_subprogram)
349
+		return false;
350
+
351
+	if (dwarf_attr(dw_die, DW_AT_declaration, &attr))
352
+		return false;
353
+
354
+	/*
355
+	 * DW_AT_declaration can be lost from function declaration
356
+	 * by gcc's bug #97060.
357
+	 * So we need to check this subprogram DIE has DW_AT_inline
358
+	 * or an entry address.
359
+	 */
360
+	if (!dwarf_attr(dw_die, DW_AT_inline, &attr) &&
361
+	    die_entrypc(dw_die, &addr) < 0)
362
+		return false;
363
+
364
+	return true;
321365 }
322366 
323367 /**
....@@ -410,9 +454,9 @@
410454 /* Get the call file index number in CU DIE */
411455 static int die_get_call_fileno(Dwarf_Die *in_die)
412456 {
413
-	Dwarf_Sword idx;
457
+	Dwarf_Word idx;
414458 
415
-	if (die_get_attr_sdata(in_die, DW_AT_call_file, &idx) == 0)
459
+	if (die_get_attr_udata(in_die, DW_AT_call_file, &idx) == 0)
416460 		return (int)idx;
417461 	else
418462 		return -ENOENT;
....@@ -421,9 +465,9 @@
421465 /* Get the declared file index number in CU DIE */
422466 static int die_get_decl_fileno(Dwarf_Die *pdie)
423467 {
424
-	Dwarf_Sword idx;
468
+	Dwarf_Word idx;
425469 
426
-	if (die_get_attr_sdata(pdie, DW_AT_decl_file, &idx) == 0)
470
+	if (die_get_attr_udata(pdie, DW_AT_decl_file, &idx) == 0)
427471 		return (int)idx;
428472 	else
429473 		return -ENOENT;
....@@ -918,9 +962,13 @@
918962 	if ((tag == DW_TAG_formal_parameter ||
919963 	     tag == DW_TAG_variable) &&
920964 	    die_compare_name(die_mem, fvp->name) &&
921
-	/* Does the DIE have location information or external instance? */
965
+	/*
966
+	 * Does the DIE have location information or const value
967
+	 * or external instance?
968
+	 */
922969 	    (dwarf_attr(die_mem, DW_AT_external, &attr) ||
923
-	     dwarf_attr(die_mem, DW_AT_location, &attr)))
970
+	     dwarf_attr(die_mem, DW_AT_location, &attr) ||
971
+	     dwarf_attr(die_mem, DW_AT_const_value, &attr)))
924972 		return DIE_FIND_CB_END;
925973 	if (dwarf_haspc(die_mem, fvp->addr))
926974 		return DIE_FIND_CB_CONTINUE;
....@@ -1033,7 +1081,7 @@
10331081 	ret = die_get_typename(vr_die, buf);
10341082 	if (ret < 0) {
10351083 		pr_debug("Failed to get type, make it unknown.\n");
1036
-		ret = strbuf_add(buf, " (unknown_type)", 14);
1084
+		ret = strbuf_add(buf, "(unknown_type)", 14);
10371085 	}
10381086 
10391087 	return ret < 0 ? ret : strbuf_addf(buf, "\t%s", dwarf_diename(vr_die));