# Python hooks for gdb for debugging GCC
-# Copyright (C) 2013-2016 Free Software Foundation, Inc.
+# Copyright (C) 2013-2021 Free Software Foundation, Inc.
# Contributed by David Malcolm <dmalcolm@redhat.com>
Callgraph nodes are printed with the name of the function decl, if
available:
(gdb) frame 5
- #5 0x00000000006c288a in expand_function (node=<cgraph_node* 0x7ffff0312720 "foo">) at ../../src/gcc/cgraphunit.c:1594
+ #5 0x00000000006c288a in expand_function (node=<cgraph_node* 0x7ffff0312720 "foo"/12345>) at ../../src/gcc/cgraphunit.c:1594
1594 execute_pass_list (g->get_passes ()->all_passes);
(gdb) p node
- $1 = <cgraph_node* 0x7ffff0312720 "foo">
+ $1 = <cgraph_node* 0x7ffff0312720 "foo"/12345>
+
+Similarly for symtab_node and varpool_node classes.
+
+Cgraph edges are printed with the name of caller and callee:
+ (gdb) p this->callees
+ $4 = <cgraph_edge* 0x7fffe25aa000 (<cgraph_node * 0x7fffe62b22e0 "_GLOBAL__sub_I__ZN5Pooma5pinfoE"/19660> -> <cgraph_node * 0x7fffe620f730 "__static_initialization_and_destruction_1"/19575>)>
+
+IPA reference follow very similar format:
+ (gdb) Value returned is $5 = <ipa_ref* 0x7fffefcb80c8 (<symtab_node * 0x7ffff562f000 "__dt_base "/875> -> <symtab_node * 0x7fffe795f000 "_ZTVN6Smarts8RunnableE"/16056>:IPA_REF_ADDR)>
vec<> pointers are printed as the address followed by the elements in
braces. Here's a length 2 vec:
import os.path
import re
import sys
+import tempfile
import gdb
import gdb.printing
# ...and look up specific values for use later:
IDENTIFIER_NODE = tree_code_dict['IDENTIFIER_NODE']
TYPE_DECL = tree_code_dict['TYPE_DECL']
+SSA_NAME = tree_code_dict['SSA_NAME']
# Similarly for "enum tree_code_class" (tree.h):
tree_code_class_dict = gdb.types.make_enum_dict(gdb.lookup_type('enum tree_code_class'))
# extern const enum tree_code_class tree_code_type[];
# #define TREE_CODE_CLASS(CODE) tree_code_type[(int) (CODE)]
+ if val_TREE_CODE == 0xa5a5:
+ return '<ggc_freed 0x%x>' % intptr(self.gdbval)
+
val_tree_code_type = gdb.parse_and_eval('tree_code_type')
val_tclass = val_tree_code_type[val_TREE_CODE]
val_code_name = val_tree_code_name[intptr(val_TREE_CODE)]
#print(val_code_name.string())
- result = '<%s 0x%x' % (val_code_name.string(), intptr(self.gdbval))
+ try:
+ result = '<%s 0x%x' % (val_code_name.string(), intptr(self.gdbval))
+ except:
+ return '<tree 0x%x>' % intptr(self.gdbval)
if intptr(val_tclass) == tcc_declaration:
tree_DECL_NAME = self.node.DECL_NAME()
if tree_DECL_NAME.is_nonnull():
result += ' %s' % tree_TYPE_NAME.DECL_NAME().IDENTIFIER_POINTER()
if self.node.TREE_CODE() == IDENTIFIER_NODE:
result += ' %s' % self.node.IDENTIFIER_POINTER()
+ elif self.node.TREE_CODE() == SSA_NAME:
+ result += ' %u' % self.gdbval['base']['u']['version']
# etc
result += '>'
return result
# Callgraph pretty-printers
######################################################################
-class CGraphNodePrinter:
+class SymtabNodePrinter:
def __init__(self, gdbval):
self.gdbval = gdbval
def to_string (self):
- result = '<cgraph_node* 0x%x' % intptr(self.gdbval)
+ t = str(self.gdbval.type)
+ result = '<%s 0x%x' % (t, intptr(self.gdbval))
if intptr(self.gdbval):
# symtab_node::name calls lang_hooks.decl_printable_name
# default implementation (lhd_decl_printable_name) is:
# return IDENTIFIER_POINTER (DECL_NAME (decl));
tree_decl = Tree(self.gdbval['decl'])
- result += ' "%s"' % tree_decl.DECL_NAME().IDENTIFIER_POINTER()
+ result += ' "%s"/%d' % (tree_decl.DECL_NAME().IDENTIFIER_POINTER(), self.gdbval['order'])
+ result += '>'
+ return result
+
+class CgraphEdgePrinter:
+ def __init__(self, gdbval):
+ self.gdbval = gdbval
+
+ def to_string (self):
+ result = '<cgraph_edge* 0x%x' % intptr(self.gdbval)
+ if intptr(self.gdbval):
+ src = SymtabNodePrinter(self.gdbval['caller']).to_string()
+ dest = SymtabNodePrinter(self.gdbval['callee']).to_string()
+ result += ' (%s -> %s)' % (src, dest)
+ result += '>'
+ return result
+
+class IpaReferencePrinter:
+ def __init__(self, gdbval):
+ self.gdbval = gdbval
+
+ def to_string (self):
+ result = '<ipa_ref* 0x%x' % intptr(self.gdbval)
+ if intptr(self.gdbval):
+ src = SymtabNodePrinter(self.gdbval['referring']).to_string()
+ dest = SymtabNodePrinter(self.gdbval['referred']).to_string()
+ result += ' (%s -> %s:%s)' % (src, dest, str(self.gdbval['use']))
result += '>'
return result
######################################################################
+class MachineModePrinter:
+ def __init__(self, gdbval):
+ self.gdbval = gdbval
+
+ def to_string (self):
+ name = str(self.gdbval['m_mode'])
+ return name[2:] if name.startswith('E_') else name
+
+######################################################################
+
+class OptMachineModePrinter:
+ def __init__(self, gdbval):
+ self.gdbval = gdbval
+
+ def to_string (self):
+ name = str(self.gdbval['m_mode'])
+ if name == 'E_VOIDmode':
+ return '<None>'
+ return name[2:] if name.startswith('E_') else name
+
+######################################################################
+
# TODO:
# * hashtab
# * location_t
def __init__(self, name):
super(GdbPrettyPrinters, self).__init__(name, [])
- def add_printer_for_types(self, name, class_, types):
- self.subprinters.append(GdbSubprinterTypeList(name, class_, types))
+ def add_printer_for_types(self, types, name, class_):
+ self.subprinters.append(GdbSubprinterTypeList(types, name, class_))
- def add_printer_for_regex(self, name, class_, regex):
- self.subprinters.append(GdbSubprinterRegex(name, class_, regex))
+ def add_printer_for_regex(self, regex, name, class_):
+ self.subprinters.append(GdbSubprinterRegex(regex, name, class_))
def __call__(self, gdbval):
type_ = gdbval.type.unqualified()
def build_pretty_printer():
pp = GdbPrettyPrinters('gcc')
- pp.add_printer_for_types(['tree'],
+ pp.add_printer_for_types(['tree', 'const_tree'],
'tree', TreePrinter)
- pp.add_printer_for_types(['cgraph_node *'],
- 'cgraph_node', CGraphNodePrinter)
+ pp.add_printer_for_types(['cgraph_node *', 'varpool_node *', 'symtab_node *'],
+ 'symtab_node', SymtabNodePrinter)
+ pp.add_printer_for_types(['cgraph_edge *'],
+ 'cgraph_edge', CgraphEdgePrinter)
+ pp.add_printer_for_types(['ipa_ref *'],
+ 'ipa_ref', IpaReferencePrinter)
pp.add_printer_for_types(['dw_die_ref'],
'dw_die_ref', DWDieRefPrinter)
pp.add_printer_for_types(['gimple', 'gimple *',
'vec',
VecPrinter)
+ pp.add_printer_for_regex(r'opt_mode<(\S+)>',
+ 'opt_mode', OptMachineModePrinter)
+ pp.add_printer_for_types(['opt_scalar_int_mode',
+ 'opt_scalar_float_mode',
+ 'opt_scalar_mode'],
+ 'opt_mode', OptMachineModePrinter)
+ pp.add_printer_for_regex(r'pod_mode<(\S+)>',
+ 'pod_mode', MachineModePrinter)
+ pp.add_printer_for_types(['scalar_int_mode_pod',
+ 'scalar_mode_pod'],
+ 'pod_mode', MachineModePrinter)
+ for mode in ('scalar_mode', 'scalar_int_mode', 'scalar_float_mode',
+ 'complex_mode'):
+ pp.add_printer_for_types([mode], mode, MachineModePrinter)
+
return pp
gdb.printing.register_pretty_printer(
gdb.current_objfile(),
- build_pretty_printer())
+ build_pretty_printer(),
+ replace=True)
def find_gcc_source_dir():
# Use location of global "g" to locate the source tree
BreakOnPass()
+class DumpFn(gdb.Command):
+ """
+ A custom command to dump a gimple/rtl function to file. By default, it
+ dumps the current function using 0 as dump_flags, but the function and flags
+ can also be specified. If /f <file> are passed as the first two arguments,
+ the dump is written to that file. Otherwise, a temporary file is created
+ and opened in the text editor specified in the EDITOR environment variable.
+
+ Examples of use:
+ (gdb) dump-fn
+ (gdb) dump-fn /f foo.1.txt
+ (gdb) dump-fn cfun->decl
+ (gdb) dump-fn /f foo.1.txt cfun->decl
+ (gdb) dump-fn cfun->decl 0
+ (gdb) dump-fn cfun->decl dump_flags
+ """
+
+ def __init__(self):
+ gdb.Command.__init__(self, 'dump-fn', gdb.COMMAND_USER)
+
+ def invoke(self, arg, from_tty):
+ # Parse args, check number of args
+ args = gdb.string_to_argv(arg)
+ if len(args) >= 1 and args[0] == "/f":
+ if len(args) == 1:
+ print ("Missing file argument")
+ return
+ filename = args[1]
+ editor_mode = False
+ base_arg = 2
+ else:
+ editor = os.getenv("EDITOR", "")
+ if editor == "":
+ print ("EDITOR environment variable not defined")
+ return
+ editor_mode = True
+ base_arg = 0
+ if len(args) - base_arg > 2:
+ print ("Too many arguments")
+ return
+
+ # Set func
+ if len(args) - base_arg >= 1:
+ funcname = args[base_arg]
+ printfuncname = "function %s" % funcname
+ else:
+ funcname = "cfun ? cfun->decl : current_function_decl"
+ printfuncname = "current function"
+ func = gdb.parse_and_eval(funcname)
+ if func == 0:
+ print ("Could not find %s" % printfuncname)
+ return
+ func = "(tree)%u" % func
+
+ # Set flags
+ if len(args) - base_arg >= 2:
+ flags = gdb.parse_and_eval(args[base_arg + 1])
+ else:
+ flags = 0
+
+ # Get tempory file, if necessary
+ if editor_mode:
+ f = tempfile.NamedTemporaryFile(delete=False, suffix=".txt")
+ filename = f.name
+ f.close()
+
+ # Open file
+ fp = gdb.parse_and_eval("(FILE *) fopen (\"%s\", \"w\")" % filename)
+ if fp == 0:
+ print ("Could not open file: %s" % filename)
+ return
+
+ # Dump function to file
+ _ = gdb.parse_and_eval("dump_function_to_file (%s, %s, %u)" %
+ (func, fp, flags))
+
+ # Close file
+ ret = gdb.parse_and_eval("(int) fclose (%s)" % fp)
+ if ret != 0:
+ print ("Could not close file: %s" % filename)
+ return
+
+ # Open file in editor, if necessary
+ if editor_mode:
+ os.system("( %s \"%s\"; rm \"%s\" ) &" %
+ (editor, filename, filename))
+
+DumpFn()
+
+class DotFn(gdb.Command):
+ """
+ A custom command to show a gimple/rtl function control flow graph.
+ By default, it show the current function, but the function can also be
+ specified.
+
+ Examples of use:
+ (gdb) dot-fn
+ (gdb) dot-fn cfun
+ (gdb) dot-fn cfun 0
+ (gdb) dot-fn cfun dump_flags
+ """
+ def __init__(self):
+ gdb.Command.__init__(self, 'dot-fn', gdb.COMMAND_USER)
+
+ def invoke(self, arg, from_tty):
+ # Parse args, check number of args
+ args = gdb.string_to_argv(arg)
+ if len(args) > 2:
+ print("Too many arguments")
+ return
+
+ # Set func
+ if len(args) >= 1:
+ funcname = args[0]
+ printfuncname = "function %s" % funcname
+ else:
+ funcname = "cfun"
+ printfuncname = "current function"
+ func = gdb.parse_and_eval(funcname)
+ if func == 0:
+ print("Could not find %s" % printfuncname)
+ return
+ func = "(struct function *)%s" % func
+
+ # Set flags
+ if len(args) >= 2:
+ flags = gdb.parse_and_eval(args[1])
+ else:
+ flags = 0
+
+ # Get temp file
+ f = tempfile.NamedTemporaryFile(delete=False)
+ filename = f.name
+
+ # Close and reopen temp file to get C FILE*
+ f.close()
+ fp = gdb.parse_and_eval("(FILE *) fopen (\"%s\", \"w\")" % filename)
+ if fp == 0:
+ print("Cannot open temp file")
+ return
+
+ # Write graph to temp file
+ _ = gdb.parse_and_eval("start_graph_dump (%s, \"<debug>\")" % fp)
+ _ = gdb.parse_and_eval("print_graph_cfg (%s, %s, %u)"
+ % (fp, func, flags))
+ _ = gdb.parse_and_eval("end_graph_dump (%s)" % fp)
+
+ # Close temp file
+ ret = gdb.parse_and_eval("(int) fclose (%s)" % fp)
+ if ret != 0:
+ print("Could not close temp file: %s" % filename)
+ return
+
+ # Show graph in temp file
+ os.system("( dot -Tx11 \"%s\"; rm \"%s\" ) &" % (filename, filename))
+
+DotFn()
+
print('Successfully loaded GDB hooks for GCC')
projects / thirdparty / gcc.git / blobdiff