From b9992c24e1603726b52377100cc146380df424d8 Mon Sep 17 00:00:00 2001
From: moculus <none@none>
Date: Fri, 28 Mar 2008 22:16:59 +0000
Subject: [PATCH] --HG-- branch : pmacs2

---
 gdb.py | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100755 gdb.py

diff --git a/gdb.py b/gdb.py
new file mode 100755
index 0000000..28eaec7
--- /dev/null
+++ b/gdb.py
@@ -0,0 +1,91 @@
+#!/usr/bin/env python
+import os, re, sys
+from subprocess import Popen, PIPE, STDOUT
+import cache
+
+_can_debug = os.system('which gdb > /dev/null 2>&1') == 0
+
+def can_debug():
+    global _can_debug
+    return _can_debug
+
+class Debugger(object):
+    frame_begin_re = re.compile('^\032\032frame-begin ([^ ]+) ([^ ]+)$')
+    source_re = re.compile('^\032\032source (.+)$')
+    def __init__(self, cmd='gdb', args=[]):
+        self.pipe = None
+        self.cmd = cmd
+        self.args = [cmd, '--annotate=3']
+        self.args.extend(args)
+        self.start()
+
+        #gdb state
+        self.prompt = None
+        self.path   = None
+        self.line   = None
+        self.char   = None
+        self.middle = None
+        self.addr   = None
+        self.breaks = []
+        
+    def start(self):
+        assert self.pipe is None
+        cmd = ' '.join(self.args)
+        self.pipe = Popen(cmd, shell=True, stdin=PIPE, stdout=PIPE, stderr=STDOUT)
+    def stop(self):
+        self.pipe.stdin.close()
+        self.pipe.stdout.close()
+        self.pipe = None
+    def restart(self):
+        self.stop()
+        self.start()
+
+    def _readline(self):
+        line = self.pipe.stdout.readline()
+        if line:
+            return line[:-1]
+        else:
+            return None
+    def _assertline(self, s):
+        l = self._readline()
+        assert l == s, repr(l)
+
+    def run(self):
+        while True:
+            line = self._readline()
+            if line is None:
+                break
+            if line.startswith('\032\032'):
+                if line == '\032\032starting':
+                    pass
+                elif line == '\032\032stopped':
+                    pass
+                elif line.startswith('\032\032frame-begin'):
+                    m = self.frame_begin_re.match(line)
+                    assert m
+                elif line.startswith('\032\032source'):
+                    m = self.source_re.match(line)
+                    assert m
+                    fields      = m.group(1).split(':')
+                    self.path   = fields[0]
+                    self.line   = int(fields[1])
+                    self.char   = int(fields[2])
+                    self.middle = fields[3]
+                    self.addr   = fields[4]
+                    print "SOURCE %r, line %d (%s)" % (self.path, self.line, self.addr)
+                elif line == '\032\032pre-prompt':
+                    self.prompt = self._readline()
+                    print 'PROMPT: %r' % self.prompt
+                    self._assertline('\032\032prompt')
+                    self.pipe.stdin.write(sys.stdin.readline())
+                    self._assertline('')
+                    self._assertline('\032\032post-prompt')
+                else:
+                    print 'CMD %r' % line
+            elif line:
+                print line
+
+if __name__ == "__main__":
+    args = sys.argv[1:]
+    d = Debugger(args=args)
+    d.run()