| import gdb |
| |
| |
| def jitmap_raw(): |
| pid = gdb.selected_inferior().pid |
| jitmap_file = open("/tmp/perf-%d.map" % (pid,), "r") |
| jitmap = jitmap_file.read() |
| jitmap_file.close() |
| return jitmap |
| |
| |
| def jit_functions(): |
| jitmap = jitmap_raw() |
| |
| functions = [] |
| for line in jitmap.strip().split("\n"): |
| [addr, size, name] = line.split(" ") |
| functions.append((int(addr, 16), int(size, 16), name)) |
| |
| return functions |
| |
| |
| class JitDecorator(gdb.FrameDecorator.FrameDecorator): |
| def __init__(self, fobj, name): |
| super(JitDecorator, self).__init__(fobj) |
| self.name = name |
| |
| def function(self): |
| return self.name |
| |
| |
| class JitFilter: |
| """ |
| A backtrace filter which reads perf map files produced by cranelift-jit. |
| """ |
| |
| def __init__(self): |
| self.name = "JitFilter" |
| self.enabled = True |
| self.priority = 0 |
| |
| gdb.current_progspace().frame_filters[self.name] = self |
| |
| # FIXME add an actual unwinder or somehow register JITed .eh_frame with gdb to avoid relying on |
| # gdb unwinder heuristics. |
| def filter(self, frame_iter): |
| for frame in frame_iter: |
| frame_addr = frame.inferior_frame().pc() |
| for addr, size, name in jit_functions(): |
| if frame_addr >= addr and frame_addr < addr + size: |
| yield JitDecorator(frame, name) |
| break |
| else: |
| yield frame |
| |
| |
| JitFilter() |
