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import lldb
from lldb_rb.constants import *
from lldb_rb.rb_base_command import RbBaseCommand
class HeapPageCommand(RbBaseCommand):
program = "heap_page"
help_string = "prints out 'struct heap_page' for a VALUE pointer in the page"
def call(self, debugger, command, exe_ctx, result):
self.t_heap_page_body = self.target.FindFirstType("struct heap_page_body")
self.t_heap_page_ptr = self.target.FindFirstType("struct heap_page").GetPointerType()
page = self._get_page(self.frame.EvaluateExpression(command))
page.Cast(self.t_heap_page_ptr)
self._append_expression(debugger, "(struct heap_page *) %0#x" % page.GetValueAsUnsigned(), result)
self._append_expression(debugger, "*(struct heap_page *) %0#x" % page.GetValueAsUnsigned(), result)
def _get_page(self, val):
addr = val.GetValueAsUnsigned()
page_addr = addr & ~(HEAP_PAGE_ALIGN_MASK)
address = lldb.SBAddress(page_addr, self.target)
body = self.target.CreateValueFromAddress("page", address, self.t_heap_page_body)
return body.GetValueForExpressionPath("->header.page")
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