Add new argument to info fibres to enable grouping by line/stack

Adds an extra optional, numerical argument to info fibres which lets you specify how many frames "up" to inspect for similarity and group. Check for same-line cases regardless of the value of that numerical argument.

Not passing that optional parameter returns output in the same format as before.

src/libfibre/libfibre.so-gdb.py

@@ -146,7 +146,7 @@ class InfoFibres(gdb.Command):
 
     def get_frame_string(self, frame):
         # Print instruction pointer
-        result = str(gdb.parse_and_eval("$rip")).split(None, 1)[0]
+        result = str(frame.read_register('rip')).split(None, 1)[0]
         result += " in " + frame.name()
         sal = frame.find_sal()
         if sal is not None and sal.symtab is not None:
@@ -155,7 +155,7 @@ class InfoFibres(gdb.Command):
 
     def get_row_for(self, idx, curr, frame, print_frame_info=True):
         result = ""
-        if (FibreSupport.list[idx] == curr):
+        if (str(FibreSupport.list[idx]) == curr):
             result += "* "
         else:
             result += "  "
@@ -163,7 +163,7 @@ class InfoFibres(gdb.Command):
 
         if frame is not None and print_frame_info == True:
             result += '\t' + self.get_frame_string(frame)
-        return result + '\n'
+        return result
 
     def print_all_fibres(self, curr):
         print(self.header)
@@ -173,8 +173,7 @@ class InfoFibres(gdb.Command):
 
     def print_grouped_fibres(self, curr, n):
         all_fibres = FibreSupport.list
-        frame_groups = {}
-        line_groups = {}
+        groups = {}
         all_output = []
         for i in range(len(FibreSupport.list)):
             with FibreSupport.get_frame(FibreSupport.list[i]) as frame:
@@ -184,72 +183,64 @@ class InfoFibres(gdb.Command):
                 ))
                 if frame is None:
                     continue
-                sal = frame.find_sal()
-
-                if sal is not None and sal.symtab is not None:
-                    # Find line similarities
-                    source_str = "%s:%d" % (sal.symtab.filename, sal.line)
-                    if source_str in line_groups:
-                        line_groups[source_str].append(i)
-                    else:
-                        line_groups[source_str] = [i]
 
-                    # Find stack similarities (up to n frames)
-                    newframe = frame
-                    for j in range(n+1):
-                        name = newframe.name()
-                        if name is None:
-                            continue
-                        if name in frame_groups:
-                            frame_groups[name].append(i)
-                        else:
-                            frame_groups[name] = [i]
-                        # Step one frame up
-                        try:
-                            newframe = newframe.older()
-                            if newframe == None:
-                                break
-                        except:
+                # Find stack similarities (up to n frames)
+                newframe = frame
+                prevframe = None
+                rip_str = ""
+                for j in range(n+1):
+                    rip_str += str(newframe.read_register('rip')).split(None, 1)[0] + ","
+                    # Step one frame up ("older" in gdb's vernacular)
+                    try:
+                        prevframe = newframe
+                        newframe = newframe.older()
+                        if newframe == None:
                             break
+                    except:
+                        break
+                elem = (i, prevframe.name())
+                if rip_str in groups:
+                    groups[rip_str].append(elem)
+                else:
+                    groups[rip_str] = [elem]
 
         grouped_indices = set()
-        # Finally print the groups
-        for line, indices in line_groups.items():
-            if len(indices) <= 1:
-                continue
-            print("Fibres at line ", line, " :")
-            print(self.header)
-            for i in indices:
-                fibre_info, frame_info = all_output[i]
-                print(fibre_info) # Consider if we should print frame_info
-                grouped_indices.add(i)
-            print()
-        line_grouped_indices = set(grouped_indices)
-        for frame, indices in frame_groups.items():
-            # Eliminate line grouped fibres
-            indices = set(indices) - line_grouped_indices
-            if len(indices) <= 1:
+        sorted_groups = list(groups.items())
+        sorted(sorted_groups, key=lambda x: len(x[1])) # Smaller groups first
+        for rip, fibres in sorted_groups:
+            if len(fibres) <= 1:
+                # Skip groups of 1
                 continue
-            print("Fibres called by ", frame, " :")
-            print(self.header)
+            print("Fibres called by same line in ", fibres[0][1], " :")
+            indices = map(lambda x: x[0], fibres)
+            joined_indices = []
             for i in indices:
-                fibre_info, frame_info = all_output[i]
-                print(fibre_info, '\t', frame_info)
                 grouped_indices.add(i)
-            print()
+                if len(joined_indices) > 0 and (joined_indices[-1][1] + 1) == i:
+                    start, end = joined_indices[-1]
+                    joined_indices[-1] = (start, i)
+                else:
+                    joined_indices.append((i,i))
+            joined_indices_strs = map(
+                lambda x: '%d-%d' % (x[0], x[1]) if x[0] < x[1] else str(x[0]),
+                joined_indices
+            )
+            print(', '.join(list(joined_indices_strs)))
+            print() # Extra newline
 
         # Print anything not grouped
         ungrouped = set(range(len(all_output))) - grouped_indices
-        print('All ungrouped fibres')
-        print(self.header)
-        for i in ungrouped:
-            fibre_info, frame_info = all_output[i]
-            print(fibre_info, '\t', frame_info)
+        if len(ungrouped) > 0:
+            print('All ungrouped fibres')
+            print(self.header)
+            for i in ungrouped:
+                fibre_info, frame_info = all_output[i]
+                print(fibre_info, '\t', frame_info)
 
     def invoke(self, arg, from_tty):
         if (not FibreSupport.saved):
             return
-        curr = gdb.parse_and_eval("Context::currStack")
+        curr = str(gdb.parse_and_eval("Context::currStack"))
         try:
             if (arg != None and int(arg) >= 0):
                 self.print_grouped_fibres(curr, int(arg))