Squashed 'third_party/elfutils/' content from commit 555e15e
Change-Id: I61cde98949e47e5c8c09c33260de17f30921be79
git-subtree-dir: third_party/elfutils
git-subtree-split: 555e15ebe8bf1eb33d00747173cfc80cc65648a4
diff --git a/libdw/dwarf_macro_getsrcfiles.c b/libdw/dwarf_macro_getsrcfiles.c
new file mode 100644
index 0000000..3b1794b
--- /dev/null
+++ b/libdw/dwarf_macro_getsrcfiles.c
@@ -0,0 +1,86 @@
+/* Find line information for a given macro.
+ Copyright (C) 2014 Red Hat, Inc.
+ This file is part of elfutils.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "libdwP.h"
+
+int
+dwarf_macro_getsrcfiles (Dwarf *dbg, Dwarf_Macro *macro,
+ Dwarf_Files **files, size_t *nfiles)
+{
+ /* macro is declared NN */
+ Dwarf_Macro_Op_Table *const table = macro->table;
+ if (table->files == NULL)
+ {
+ Dwarf_Off line_offset = table->line_offset;
+ if (line_offset == (Dwarf_Off) -1)
+ {
+ *files = NULL;
+ *nfiles = 0;
+ return 0;
+ }
+
+ /* If TABLE->comp_dir is NULL that could mean any of the
+ following:
+
+ - The macro unit is not bound to a CU. It's an auxiliary
+ unit used purely for import from other units. In that case
+ there's actually no COMP_DIR value that we could use.
+
+ - The macro unit is bound to a CU, but there's no
+ DW_AT_comp_dir attribute at the CU DIE.
+
+ - The macro unit is bound to a CU, but we don't know that,
+ likely because its iteration was requested through
+ dwarf_getmacros_off interface. This might be legitimate if
+ one macro unit imports another CU's macro unit, but that is
+ unlikely to happen in practice. Most probably this is not
+ legitimate use of the interfaces.
+
+ So when the interfaces are used correctly, COMP_DIR value is
+ always right. That means that we can cache the parsed
+ .debug_line unit without fear that later on someone requests
+ the same unit through dwarf_getsrcfiles, and the file names
+ will be broken. */
+
+ if (__libdw_getsrclines (dbg, line_offset, table->comp_dir,
+ table->is_64bit ? 8 : 4,
+ NULL, &table->files) < 0)
+ table->files = (void *) -1;
+ }
+
+ if (table->files == (void *) -1)
+ return -1;
+
+ *files = table->files;
+ *nfiles = table->files->nfiles;
+ return 0;
+}