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ruby--ruby/misc/lldb_cruby.py
Nobuyoshi Nakada e078352a78
lldb_cruby.py: fixed inspecting string [ci skip] 
Show the size of String.

To see the whole contents even after NUL char:

```
(lldb) rp str
(const char [5]) $1 = "x"
(lldb) memory read -s1 --format x --count `sizeof($1)` -- &$1                                                                                          0x1010457a8: 0x78 0x00 0x61 0x61 0x61
```
2019-10-09 09:08:21 +09:00

270 lines
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#!/usr/bin/env python
#coding: utf-8
#
# Usage: run `command script import -r misc/lldb_cruby.py` on LLDB
#
# Test: misc/test_lldb_cruby.rb
#
from __future__ import print_function
import lldb
import os
import shlex
def lldb_init(debugger):
target = debugger.GetSelectedTarget()
global SIZEOF_VALUE
SIZEOF_VALUE = target.FindFirstType("VALUE").GetByteSize()
value_types = []
g = globals()
for enum in target.FindFirstGlobalVariable('ruby_dummy_gdb_enums'):
enum = enum.GetType()
members = enum.GetEnumMembers()
for i in range(0, members.GetSize()):
member = members.GetTypeEnumMemberAtIndex(i)
name = member.GetName()
value = member.GetValueAsUnsigned()
g[name] = value
if name.startswith('RUBY_T_'):
value_types.append(name)
g['value_types'] = value_types
def string2cstr(rstring):
"""Returns the pointer to the C-string in the given String object"""
if rstring.TypeIsPointerType():
rstring = rstring.Dereference()
flags = rstring.GetValueForExpressionPath(".basic->flags").unsigned
if flags & RUBY_T_MASK != RUBY_T_STRING:
raise TypeError("not a string")
if flags & RUBY_FL_USER1:
cptr = int(rstring.GetValueForExpressionPath(".as.heap.ptr").value, 0)
clen = int(rstring.GetValueForExpressionPath(".as.heap.len").value, 0)
else:
cptr = int(rstring.GetValueForExpressionPath(".as.ary").location, 0)
clen = (flags & RSTRING_EMBED_LEN_MASK) >> RSTRING_EMBED_LEN_SHIFT
return cptr, clen
def output_string(ctx, rstring):
cptr, clen = string2cstr(rstring)
expr = 'printf("%%.*s", (size_t)%d, (const char*)%d)' % (clen, cptr)
ctx.frame.EvaluateExpression(expr)
def fixnum_p(x):
return x & RUBY_FIXNUM_FLAG != 0
def flonum_p(x):
return (x&RUBY_FLONUM_MASK) == RUBY_FLONUM_FLAG
def static_sym_p(x):
return (x&~(~0<<RUBY_SPECIAL_SHIFT)) == RUBY_SYMBOL_FLAG
def append_command_output(debugger, command, result):
output1 = result.GetOutput()
debugger.GetCommandInterpreter().HandleCommand(command, result)
output2 = result.GetOutput()
result.Clear()
result.write(output1)
result.write(output2)
def lldb_rp(debugger, command, result, internal_dict):
if not ('RUBY_Qfalse' in globals()):
lldb_init(debugger)
target = debugger.GetSelectedTarget()
process = target.GetProcess()
thread = process.GetSelectedThread()
frame = thread.GetSelectedFrame()
if frame.IsValid():
val = frame.EvaluateExpression(command)
else:
val = target.EvaluateExpression(command)
error = val.GetError()
if error.Fail():
print(error, file=result)
return
lldb_inspect(debugger, target, result, val)
def lldb_inspect(debugger, target, result, val):
num = val.GetValueAsSigned()
if num == RUBY_Qfalse:
print('false', file=result)
elif num == RUBY_Qtrue:
print('true', file=result)
elif num == RUBY_Qnil:
print('nil', file=result)
elif num == RUBY_Qundef:
print('undef', file=result)
elif fixnum_p(num):
print(num >> 1, file=result)
elif flonum_p(num):
append_command_output(debugger, "print rb_float_value(%0#x)" % val.GetValueAsUnsigned(), result)
elif static_sym_p(num):
if num < 128:
print("T_SYMBOL: %c" % num, file=result)
else:
print("T_SYMBOL: (%x)" % num, file=result)
elif num & RUBY_IMMEDIATE_MASK:
print('immediate(%x)' % num, file=result)
else:
tRBasic = target.FindFirstType("struct RBasic").GetPointerType()
val = val.Cast(tRBasic)
flags = val.GetValueForExpressionPath("->flags").GetValueAsUnsigned()
if (flags & RUBY_FL_PROMOTED) == RUBY_FL_PROMOTED:
print("[PROMOTED] ", file=result)
if (flags & RUBY_FL_FREEZE) == RUBY_FL_FREEZE:
print("[FROZEN] ", file=result)
flType = flags & RUBY_T_MASK
if flType == RUBY_T_NONE:
print('T_NONE: %s' % val.Dereference(), file=result)
elif flType == RUBY_T_NIL:
print('T_NIL: %s' % val.Dereference(), file=result)
elif flType == RUBY_T_OBJECT:
tRObject = target.FindFirstType("struct RObject").GetPointerType()
val = val.Cast(tRObject)
print('T_OBJECT: %s' % val.Dereference(), file=result)
elif flType == RUBY_T_CLASS or flType == RUBY_T_MODULE or flType == RUBY_T_ICLASS:
tRClass = target.FindFirstType("struct RClass").GetPointerType()
val = val.Cast(tRClass)
print('T_%s: %s' % ('CLASS' if flType == RUBY_T_CLASS else 'MODULE' if flType == RUBY_T_MODULE else 'ICLASS', val.Dereference()), file=result)
elif flType == RUBY_T_STRING:
tRString = target.FindFirstType("struct RString").GetPointerType()
ptr, len = string2cstr(val.Cast(tRString))
append_command_output(debugger, "print *(const char (*)[%d])%0#x" % (len, ptr), result)
elif flType == RUBY_T_SYMBOL:
tRSymbol = target.FindFirstType("struct RSymbol").GetPointerType()
print(val.Cast(tRSymbol).Dereference(), file=result)
elif flType == RUBY_T_ARRAY:
tRArray = target.FindFirstType("struct RArray").GetPointerType()
val = val.Cast(tRArray)
if flags & RUBY_FL_USER1:
len = ((flags & (RUBY_FL_USER3|RUBY_FL_USER4)) >> (RUBY_FL_USHIFT+3))
ptr = val.GetValueForExpressionPath("->as.ary")
else:
len = val.GetValueForExpressionPath("->as.heap.len").GetValueAsSigned()
ptr = val.GetValueForExpressionPath("->as.heap.ptr")
#print(val.GetValueForExpressionPath("->as.heap"), file=result)
result.write("T_ARRAY: len=%d" % len)
if flags & RUBY_FL_USER1:
result.write(" (embed)")
elif flags & RUBY_FL_USER2:
shared = val.GetValueForExpressionPath("->as.heap.aux.shared").GetValueAsUnsigned()
result.write(" (shared) shared=%016x" % shared)
else:
capa = val.GetValueForExpressionPath("->as.heap.aux.capa").GetValueAsSigned()
result.write(" (ownership) capa=%d" % capa)
if len == 0:
result.write(" {(empty)}")
else:
result.write("\n")
append_command_output(debugger, "expression -Z %d -fx -- (const VALUE*)%0#x" % (len, ptr.GetValueAsUnsigned()), result)
elif flType == RUBY_T_HASH:
append_command_output(debugger, "p *(struct RHash *) %0#x" % val.GetValueAsUnsigned(), result)
elif flType == RUBY_T_BIGNUM:
tRBignum = target.FindFirstType("struct RBignum").GetPointerType()
val = val.Cast(tRBignum)
if flags & RUBY_FL_USER2:
len = ((flags & (RUBY_FL_USER3|RUBY_FL_USER4|RUBY_FL_USER5)) >> (RUBY_FL_USHIFT+3))
print("T_BIGNUM: len=%d (embed)" % len, file=result)
append_command_output(debugger, "print ((struct RBignum *) %0#x)->as.ary" % val.GetValueAsUnsigned(), result)
else:
len = val.GetValueForExpressionPath("->as.heap.len").GetValueAsSigned()
print("T_BIGNUM: len=%d" % len, file=result)
print(val.Dereference(), file=result)
append_command_output(debugger, "expression -Z %x -fx -- (const BDIGIT*)((struct RBignum*)%d)->as.heap.digits" % (len, val.GetValueAsUnsigned()), result)
# append_command_output(debugger, "x ((struct RBignum *) %0#x)->as.heap.digits / %d" % (val.GetValueAsUnsigned(), len), result)
elif flType == RUBY_T_FLOAT:
tRFloat = target.FindFirstType("struct RFloat").GetPointerType()
val = val.Cast(tRFloat)
append_command_output(debugger, "p *(double *)%0#x" % val.GetValueForExpressionPath("->float_value").GetAddress(), result)
elif flType == RUBY_T_RATIONAL:
tRRational = target.FindFirstType("struct RRational").GetPointerType()
val = val.Cast(tRRational)
lldb_inspect(debugger, target, result, val.GetValueForExpressionPath("->num"))
output = result.GetOutput()
result.Clear()
result.write("(Rational) " + output.rstrip() + " / ")
lldb_inspect(debugger, target, result, val.GetValueForExpressionPath("->den"))
elif flType == RUBY_T_COMPLEX:
tRComplex = target.FindFirstType("struct RComplex").GetPointerType()
val = val.Cast(tRComplex)
lldb_inspect(debugger, target, result, val.GetValueForExpressionPath("->real"))
real = result.GetOutput().rstrip()
result.Clear()
lldb_inspect(debugger, target, result, val.GetValueForExpressionPath("->imag"))
imag = result.GetOutput().rstrip()
result.Clear()
if not imag.startswith("-"):
imag = "+" + imag
print("(Complex) " + real + imag + "i", file=result)
elif flType == RUBY_T_REGEXP:
tRRegex = target.FindFirstType("struct RRegexp").GetPointerType()
val = val.Cast(tRRegex)
print("(Regex) ->src {", file=result)
lldb_inspect(debugger, target, result, val.GetValueForExpressionPath("->src"))
print("}", file=result)
elif flType == RUBY_T_DATA:
tRTypedData = target.FindFirstType("struct RTypedData").GetPointerType()
val = val.Cast(tRTypedData)
flag = val.GetValueForExpressionPath("->typed_flag")
if flag.GetValueAsUnsigned() == 1:
print("T_DATA: %s" % val.GetValueForExpressionPath("->type->wrap_struct_name"), file=result)
append_command_output(debugger, "p *(struct RTypedData *) %0#x" % val.GetValueAsUnsigned(), result)
else:
print("T_DATA:", file=result)
append_command_output(debugger, "p *(struct RData *) %0#x" % val.GetValueAsUnsigned(), result)
elif flType == RUBY_T_NODE:
tRTypedData = target.FindFirstType("struct RNode").GetPointerType()
nd_type = (flags & RUBY_NODE_TYPEMASK) >> RUBY_NODE_TYPESHIFT
append_command_output(debugger, "p (node_type) %d" % nd_type, result)
val = val.Cast(tRTypedData)
append_command_output(debugger, "p *(struct RNode *) %0#x" % val.GetValueAsUnsigned(), result)
else:
print("Not-handled type %0#x" % flType, file=result)
print(val, file=result)
def count_objects(debugger, command, ctx, result, internal_dict):
objspace = ctx.frame.EvaluateExpression("ruby_current_vm->objspace")
num_pages = objspace.GetValueForExpressionPath(".heap_pages.allocated_pages").unsigned
counts = {}
total = 0
for t in range(0x00, RUBY_T_MASK+1):
counts[t] = 0
for i in range(0, num_pages):
print("\rcounting... %d/%d" % (i, num_pages), end="")
page = objspace.GetValueForExpressionPath('.heap_pages.sorted[%d]' % i)
p = page.GetChildMemberWithName('start')
num_slots = page.GetChildMemberWithName('total_slots').unsigned
for j in range(0, num_slots):
obj = p.GetValueForExpressionPath('[%d]' % j)
flags = obj.GetValueForExpressionPath('.as.basic.flags').unsigned
obj_type = flags & RUBY_T_MASK
counts[obj_type] += 1
total += num_slots
print("\rTOTAL: %d, FREE: %d" % (total, counts[0x00]))
for sym in value_types:
print("%s: %d" % (sym, counts[globals()[sym]]))
def stack_dump_raw(debugger, command, ctx, result, internal_dict):
ctx.frame.EvaluateExpression("rb_vmdebug_stack_dump_raw_current()")
def dump_node(debugger, command, ctx, result, internal_dict):
args = shlex.split(command)
if not args:
return
node = args[0]
dump = ctx.frame.EvaluateExpression("(struct RString*)rb_parser_dump_tree((NODE*)(%s), 0)" % node)
output_string(ctx, dump)
def __lldb_init_module(debugger, internal_dict):
debugger.HandleCommand("command script add -f lldb_cruby.lldb_rp rp")
debugger.HandleCommand("command script add -f lldb_cruby.count_objects rb_count_objects")
debugger.HandleCommand("command script add -f lldb_cruby.stack_dump_raw SDR")
debugger.HandleCommand("command script add -f lldb_cruby.dump_node dump_node")
lldb_init(debugger)
print("lldb scripts for ruby has been installed.")
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