New python script adding pretty printers for types defined in GDB.
* gdb-gdb.py: New file.
This commit is contained in:
Joel Brobecker
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39e841c4d3
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2 changed files with 245 additions and 0 deletions
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2010-01-06 Joel Brobecker <brobecker@adacore.com>
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* gdb-gdb.py: New file.
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2010-01-05 Michael Snyder <msnyder@vmware.com>
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* infrun.c (handle_inferior_event): Fix typo in comment.
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241
gdb/gdb-gdb.py
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241
gdb/gdb-gdb.py
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# Copyright (C) 2009, 2010 Free Software Foundation, Inc.
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#
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# This file is part of GDB.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import gdb
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import os.path
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class TypeFlag:
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"""A class that allows us to store a flag name, its short name,
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and its value.
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In the GDB sources, struct type has a component called instance_flags
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whose the value is the addition of various flags. These flags are
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defined by two emumerates: type_flag_value, and type_instance_flag_value.
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This class helps us recreate a list with all these flags that is
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easy to manipulate and sort. Because all flag names start with either
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TYPE_FLAG_ or TYPE_INSTANCE_FLAG_, a short_name attribute is provided
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that strips this prefix.
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ATTRIBUTES
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name: The enumeration name (eg: "TYPE_FLAG_UNSIGNED").
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value: The associated value.
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short_name: The enumeration name, with the suffix stripped.
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"""
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def __init__(self, name, value):
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self.name = name
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self.value = value
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self.short_name = name.replace("TYPE_FLAG_", '')
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if self.short_name == name:
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self.short_name = name.replace("TYPE_INSTANCE_FLAG_", '')
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def __cmp__(self, other):
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"""Sort by value order."""
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return self.value.__cmp__(other.value)
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# A list of all existing TYPE_FLAGS_* and TYPE_INSTANCE_FLAGS_*
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# enumerations, stored as TypeFlags objects. Lazy-initialized.
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TYPE_FLAGS = None
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class TypeFlagsPrinter:
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"""A class that prints a decoded form of an instance_flags value.
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This class uses a global named TYPE_FLAGS, which is a list of
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all defined TypeFlag values. Using a global allows us to compute
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this list only once.
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This class relies on a couple of enumeration types being defined.
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If not, then printing of the instance_flag is going to be degraded,
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but it's not a fatal error.
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"""
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def __init__(self, val):
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self.val = val
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def __str__(self):
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global TYPE_FLAGS
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if TYPE_FLAGS is None:
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self.init_TYPE_FLAGS()
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if not self.val:
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return "0"
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if TYPE_FLAGS:
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flag_list = [flag.short_name for flag in TYPE_FLAGS
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if self.val & flag.value]
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else:
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flag_list = ["???"]
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return "0x%x [%s]" % (self.val, "|".join(flag_list))
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def init_TYPE_FLAGS(self):
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"""Initialize the TYPE_FLAGS global as a list of TypeFlag objects.
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This operation requires the search of a couple of enumeration types.
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If not found, a warning is printed on stdout, and TYPE_FLAGS is
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set to the empty list.
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The resulting list is sorted by increasing value, to facilitate
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printing of the list of flags used in an instance_flags value.
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"""
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global TYPE_FLAGS
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TYPE_FLAGS = []
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try:
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flags = gdb.lookup_type("enum type_flag_value")
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except:
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print "Warning: Cannot find enum type_flag_value type."
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print " `struct type' pretty-printer will be degraded"
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return
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try:
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iflags = gdb.lookup_type("enum type_instance_flag_value")
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except:
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print "Warning: Cannot find enum type_instance_flag_value type."
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print " `struct type' pretty-printer will be degraded"
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return
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# Note: TYPE_FLAG_MIN is a duplicate of TYPE_FLAG_UNSIGNED,
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# so exclude it from the list we are building.
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TYPE_FLAGS = [TypeFlag(field.name, field.bitpos)
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for field in flags.fields()
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if field.name != 'TYPE_FLAG_MIN']
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TYPE_FLAGS += [TypeFlag(field.name, field.bitpos)
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for field in iflags.fields()]
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TYPE_FLAGS.sort()
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class StructTypePrettyPrinter:
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"""Pretty-print an object of type struct type"""
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def __init__(self, val):
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self.val = val
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def to_string(self):
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fields = []
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fields.append("pointer_type = %s" % self.val['pointer_type'])
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fields.append("reference_type = %s" % self.val['reference_type'])
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fields.append("chain = %s" % self.val['reference_type'])
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fields.append("instance_flags = %s"
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% TypeFlagsPrinter(self.val['instance_flags']))
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fields.append("length = %d" % self.val['length'])
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fields.append("main_type = %s" % self.val['main_type'])
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return "\n{" + ",\n ".join(fields) + "}"
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class StructMainTypePrettyPrinter:
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"""Pretty-print an objet of type main_type"""
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def __init__(self, val):
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self.val = val
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def flags_to_string(self):
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"""struct main_type contains a series of components that
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are one-bit ints whose name start with "flag_". For instance:
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flag_unsigned, flag_stub, etc. In essence, these components are
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really boolean flags, and this method prints a short synthetic
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version of the value of all these flags. For instance, if
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flag_unsigned and flag_static are the only components set to 1,
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this function will return "unsigned|static".
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"""
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fields = [field.name.replace("flag_", "")
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for field in self.val.type.fields()
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if field.name.startswith("flag_")
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and self.val[field.name]]
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return "|".join(fields)
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def owner_to_string(self):
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"""Return an image of component "owner".
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"""
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if self.val['flag_objfile_owned'] != 0:
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return "%s (objfile)" % self.val['owner']['objfile']
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else:
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return "%s (gdbarch)" % self.val['owner']['gdbarch']
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def struct_field_location_img(self, field_val):
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"""Return an image of the loc component inside the given field
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gdb.Value.
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"""
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loc_val = field_val['loc']
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loc_kind = str(field_val['loc_kind'])
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if loc_kind == "FIELD_LOC_KIND_BITPOS":
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return 'bitpos = %d' % loc_val['bitpos']
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elif loc_kind == "FIELD_LOC_KIND_PHYSADDR":
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return 'physaddr = 0x%x' % loc_val['physaddr']
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elif loc_kind == "FIELD_LOC_KIND_PHYSNAME":
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return 'physname = %s' % loc_val['physname']
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elif loc_kind == "FIELD_LOC_KIND_DWARF_BLOCK":
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return 'dwarf_block = %s' % loc_val['dwarf_block']
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else:
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return 'loc = ??? (unsupported loc_kind value)'
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def struct_field_img(self, fieldno):
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"""Return an image of the main_type field number FIELDNO.
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"""
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f = self.val['flds_bnds']['fields'][fieldno]
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label = "field[%d]:" % fieldno
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if f['artificial']:
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label += " (artificial)"
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fields = []
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fields.append("name = %s" % f['name'])
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fields.append("type = %s" % f['type'])
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fields.append("loc_kind = %s" % f['loc_kind'])
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fields.append("bitsize = %d" % f['bitsize'])
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fields.append(self.struct_field_location_img(f))
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return label + "\n" + " {" + ",\n ".join(fields) + "}"
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def bounds_img(self):
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"""Return an image of the main_type bounds.
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"""
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b = self.val['flds_bnds']['bounds'].dereference()
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low = str(b['low'])
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if b['low_undefined'] != 0:
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low += " (undefined)"
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high = str(b['high'])
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if b['high_undefined'] != 0:
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high += " (undefined)"
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return "bounds = {%s, %s}" % (low, high)
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def to_string(self):
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"""Return a pretty-printed image of our main_type.
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"""
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fields = []
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fields.append("name = %s" % self.val['name'])
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fields.append("tag_name = %s" % self.val['tag_name'])
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fields.append("code = %s" % self.val['code'])
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fields.append("flags = [%s]" % self.flags_to_string())
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fields.append("owner = %s" % self.owner_to_string())
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fields.append("target_type = %s" % self.val['target_type'])
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fields.append("vptr_basetype = %s" % self.val['vptr_basetype'])
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if self.val['nfields'] > 0:
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for fieldno in range(self.val['nfields']):
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fields.append("field[%d]:")
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fields.append(self.struct_field_img(fieldno))
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if self.val.type.code == gdb.TYPE_CODE_RANGE:
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fields.append(self.bounds_img())
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# FIXME: We need to print the type_specific field as well.
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# But I will wait for a patch that introduces a discriminant.
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# This will simplify the selection of the right component in
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# that union.
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return "\n{" + ",\n ".join(fields) + "}"
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def type_lookup_function(val):
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"""A routine that returns the correct pretty printer for VAL
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if appropriate. Returns None otherwise.
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"""
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if val.type.tag == "type":
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return StructTypePrettyPrinter(val)
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elif val.type.tag == "main_type":
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return StructMainTypePrettyPrinter(val)
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return None
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def register_pretty_printer(objfile):
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"""A routine to register a pretty-printer against the given OBJFILE.
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"""
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objfile.pretty_printers.append(type_lookup_function)
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if __name__ == "__main__":
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if gdb.current_objfile() is not None:
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# This is the case where this script is being "auto-loaded"
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# for a given objfile. Register the pretty-printer for that
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# objfile.
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register_pretty_printer(gdb.current_objfile())
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else:
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# We need to locate the objfile corresponding to the GDB
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# executable, and register the pretty-printer for that objfile.
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# FIXME: The condition used to match the objfile is too simplistic
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# and will not work on Windows.
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for objfile in gdb.objfiles():
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if os.path.basename(objfile.filename) == "gdb":
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objfile.pretty_printers.append(type_lookup_function)
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