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add lldb functions for getting the heap page / heap page body

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Aaron Patterson 2020-09-02 16:42:56 -07:00
parent 933035d303
commit 3fb255625b
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1 changed files with 40 additions and 0 deletions
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misc/lldb_cruby.py
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@ -11,6 +11,9 @@ import lldb
import os import os
import shlex import shlex
HEAP_PAGE_ALIGN_LOG = 14
HEAP_PAGE_ALIGN_MASK = (~(~0 << HEAP_PAGE_ALIGN_LOG))
def lldb_init(debugger): def lldb_init(debugger):
target = debugger.GetSelectedTarget() target = debugger.GetSelectedTarget()
global SIZEOF_VALUE global SIZEOF_VALUE
@ -283,6 +286,41 @@ 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 heap_page(debugger, command, ctx, result, internal_dict):
target = debugger.GetSelectedTarget()
process = target.GetProcess()
thread = process.GetSelectedThread()
frame = thread.GetSelectedFrame()
val = frame.EvaluateExpression(command)
page = get_page(lldb, target, val)
page_type = target.FindFirstType("struct heap_page").GetPointerType()
page.Cast(page_type)
append_command_output(debugger, "p (struct heap_page *) %0#x" % page.GetValueAsUnsigned(), result)
append_command_output(debugger, "p *(struct heap_page *) %0#x" % page.GetValueAsUnsigned(), result)
def heap_page_body(debugger, command, ctx, result, internal_dict):
target = debugger.GetSelectedTarget()
process = target.GetProcess()
thread = process.GetSelectedThread()
frame = thread.GetSelectedFrame()
val = frame.EvaluateExpression(command)
page = get_page_body(lldb, target, val)
print("Page body address: ", page.GetAddress(), file=result)
print(page, file=result)
def get_page_body(lldb, target, val):
tHeapPageBody = target.FindFirstType("struct heap_page_body")
addr = val.GetValueAsUnsigned()
page_addr = addr & ~(HEAP_PAGE_ALIGN_MASK)
address = lldb.SBAddress(page_addr, target)
return target.CreateValueFromAddress("page", address, tHeapPageBody)
def get_page(lldb, target, val):
body = get_page_body(lldb, target, val)
return body.GetValueForExpressionPath("->header.page")
def dump_node(debugger, command, ctx, result, internal_dict): def dump_node(debugger, command, ctx, result, internal_dict):
args = shlex.split(command) args = shlex.split(command)
if not args: if not args:
@ -297,5 +335,7 @@ def __lldb_init_module(debugger, internal_dict):
debugger.HandleCommand("command script add -f lldb_cruby.count_objects rb_count_objects") 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.stack_dump_raw SDR")
debugger.HandleCommand("command script add -f lldb_cruby.dump_node dump_node") debugger.HandleCommand("command script add -f lldb_cruby.dump_node dump_node")
debugger.HandleCommand("command script add -f lldb_cruby.heap_page heap_page")
debugger.HandleCommand("command script add -f lldb_cruby.heap_page_body heap_page_body")
lldb_init(debugger) lldb_init(debugger)
print("lldb scripts for ruby has been installed.") print("lldb scripts for ruby has been installed.")