Mesa (debug-refcnt-2): u_debug_symbol: add support for getting symbol names from glibc

[Luca Barbieri]

Module: Mesa
Branch: debug-refcnt-2
Commit: 382b022619d9d2b21226f1f59c57c095e7e4f1ac
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=382b022619d9d2b21226f1f59c57c095e7e4f1ac

Author: Luca Barbieri <luca at luca-barbieri.com>
Date:   Wed Aug 18 00:39:49 2010 +0200

u_debug_symbol: add support for getting symbol names from glibc

---

 src/gallium/auxiliary/util/u_debug_symbol.c |   23 +++++++++++++++++++++++
 src/gallium/tools/addr2line.sh              |   26 ++++++++++++++++++++++++++
 2 files changed, 49 insertions(+), 0 deletions(-)

diff --git a/src/gallium/auxiliary/util/u_debug_symbol.c b/src/gallium/auxiliary/util/u_debug_symbol.c
index 1f71c1d..61f4e6f 100644
--- a/src/gallium/auxiliary/util/u_debug_symbol.c
+++ b/src/gallium/auxiliary/util/u_debug_symbol.c
@@ -143,6 +143,23 @@ debug_symbol_name_imagehlp(const void *addr, char* buf, unsigned size)
 }
 #endif
 
+#ifdef __GLIBC__
+#include <execinfo.h>
+
+/* This can only provide dynamic symbols, or binary offsets into a file.
+ *
+ * To fix this, post-process the output with tools/addr2line.sh
+ */
+static INLINE void
+debug_symbol_name_glibc(const void *addr, char* buf, unsigned size)
+{
+   char** syms = backtrace_symbols((void**)&addr, 1);
+   strncpy(buf, syms[0], size);
+   buf[size - 1] = 0;
+   free(syms);
+}
+#endif
+
 void
 debug_symbol_name(const void *addr, char* buf, unsigned size)
 {
@@ -152,6 +169,12 @@ debug_symbol_name(const void *addr, char* buf, unsigned size)
       return;
 #endif
 
+#ifdef __GLIBC__
+   debug_symbol_name_glibc(addr, buf, size);
+   if(buf[0])
+      return;
+#endif
+
    util_snprintf(buf, size, "%p", addr);
    buf[size - 1] = 0;
 }
diff --git a/src/gallium/tools/addr2line.sh b/src/gallium/tools/addr2line.sh
new file mode 100755
index 0000000..34dec14
--- /dev/null
+++ b/src/gallium/tools/addr2line.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+# This script processes symbols output by Gallium using glibc to human-readable function names
+
+lastbin=
+i=-1
+dir="$(mktemp -d)"
+input="$1"
+
+# Gather all unique addresses for each binary
+sed -nre 's|([^ ]*/[^ ]*)\(\+0x([^)]*).*|\1 \2|p' "$input"|sort|uniq|while read bin addr; do
+	if test "$lastbin" != "$bin"; then
+		((++i))
+		lastbin="$bin"
+		echo "$bin" > "$dir/$i.addrs.bin"
+	fi
+	echo "$addr" >> "$dir/$i.addrs"
+done
+
+# Construct a sed script to convert hex address to human readable form, and apply it
+for i in "$dir"/*.addrs; do
+	bin="$(<"$i.bin")"
+	addr2line -p -e "$bin" -a -f < "$i"|sed -nre 's@^0x0*([^:]*): ([^?]*)$@s|'"$bin"'(+0x\1)|\2|g at gp'
+	rm -f "$i" "$i.bin"
+done|sed -f - "$input"
+
+rmdir "$dir"