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bit table information when printing an object

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Aaron Patterson 2020-09-28 16:44:58 -07:00
parent 85e9cc2c87
commit 0a3099ae40
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GPG Key ID: 953170BCB4FFAFC6
1 changed files with 30 additions and 0 deletions
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30
misc/lldb_cruby.py
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@ -113,9 +113,31 @@ def lldb_inspect(debugger, target, result, val):
print('immediate(%x)' % num, file=result) print('immediate(%x)' % num, file=result)
else: else:
tRBasic = target.FindFirstType("struct RBasic").GetPointerType() tRBasic = target.FindFirstType("struct RBasic").GetPointerType()
tRValue = target.FindFirstType("struct RVALUE")
tUintPtr = target.FindFirstType("uintptr_t") # bits_t
val = val.Cast(tRBasic) val = val.Cast(tRBasic)
flags = val.GetValueForExpressionPath("->flags").GetValueAsUnsigned() flags = val.GetValueForExpressionPath("->flags").GetValueAsUnsigned()
flaginfo = "" flaginfo = ""
num_in_page = (val.GetValueAsUnsigned() & HEAP_PAGE_ALIGN_MASK) // tRValue.GetByteSize();
bits_bitlength = tUintPtr.GetByteSize() * 8
bitmap_index = num_in_page // bits_bitlength
bitmap_offset = num_in_page & (bits_bitlength - 1)
bitmap_bit = 1 << bitmap_offset
page = get_page(lldb, target, val)
page_type = target.FindFirstType("struct heap_page").GetPointerType()
page.Cast(page_type)
print("bits [%s%s%s%s%s]" % (
check_bits(page, "uncollectible_bits", bitmap_index, bitmap_bit, "L"),
check_bits(page, "mark_bits", bitmap_index, bitmap_bit, "M"),
check_bits(page, "pinned_bits", bitmap_index, bitmap_bit, "P"),
check_bits(page, "marking_bits", bitmap_index, bitmap_bit, "R"),
check_bits(page, "wb_unprotected_bits", bitmap_index, bitmap_bit, "U"),
), file=result)
if (flags & RUBY_FL_PROMOTED) == RUBY_FL_PROMOTED: if (flags & RUBY_FL_PROMOTED) == RUBY_FL_PROMOTED:
flaginfo += "[PROMOTED] " flaginfo += "[PROMOTED] "
if (flags & RUBY_FL_FREEZE) == RUBY_FL_FREEZE: if (flags & RUBY_FL_FREEZE) == RUBY_FL_FREEZE:
@ -286,6 +308,14 @@ def count_objects(debugger, command, ctx, result, internal_dict):
def stack_dump_raw(debugger, command, ctx, result, internal_dict): def stack_dump_raw(debugger, command, ctx, result, internal_dict):
ctx.frame.EvaluateExpression("rb_vmdebug_stack_dump_raw_current()") ctx.frame.EvaluateExpression("rb_vmdebug_stack_dump_raw_current()")
def check_bits(page, bitmap_name, bitmap_index, bitmap_bit, v):
bits = page.GetChildMemberWithName(bitmap_name)
plane = bits.GetChildAtIndex(bitmap_index).GetValueAsUnsigned()
if (plane & bitmap_bit) != 0:
return v
else:
return ' '
def heap_page(debugger, command, ctx, result, internal_dict): def heap_page(debugger, command, ctx, result, internal_dict):
target = debugger.GetSelectedTarget() target = debugger.GetSelectedTarget()
process = target.GetProcess() process = target.GetProcess()