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"""
This python script provides LLDB formatters for Slang core types.
To use it, add the following line to your ~/.lldbinit file:
command script import /path/to/source/core/core_lldb.py
"""
import lldb
# Set to True to enable the logger
ENABLE_LOGGING = True
# log to the LLDB formatter stream
def log(msg):
if ENABLE_LOGGING:
lldb.formatters.Logger.Logger() >> msg
def make_string(F: lldb.SBData, L: int) -> str:
strval = ""
G = F.uint8
for X in range(L):
V = G[X]
if V == 0:
break
strval = strval + chr(V % 256)
return '"' + strval + '"'
# Return the pointer to the data in a Slang::RefPtr
def get_ref_pointer(valobj: lldb.SBValue) -> lldb.SBValue:
return valobj.GetNonSyntheticValue().GetChildMemberWithName("pointer")
# Check if a pointer is nullptr
def is_nullptr(valobj: lldb.SBValue) -> bool:
return valobj.GetValueAsUnsigned(0) == 0
# Slang::String summary
def String_summary(valobj: lldb.SBValue, dict) -> str:
buffer_ptr = get_ref_pointer(valobj.GetChildMemberWithName("m_buffer"))
if is_nullptr(buffer_ptr):
return '""'
buffer = buffer_ptr.Dereference()
length = buffer.GetChildMemberWithName("length").GetValueAsUnsigned(0)
data = buffer_ptr.GetPointeeData(1, length)
return make_string(data, length)
# Slang::UnownedStringSlice summary
def UnownedStringSlice_summary(valobj: lldb.SBValue, dict) -> str:
begin = valobj.GetChildMemberWithName("m_begin")
end = valobj.GetChildMemberWithName("m_end")
length = end.GetValueAsUnsigned(0) - begin.GetValueAsUnsigned(0)
if length <= 0:
return '""'
data = begin.GetPointeeData(0, length)
return make_string(data, length)
# Slang::RefPtr synthetic provider
class RefPtr_synthetic(lldb.SBSyntheticValueProvider):
def __init__(self, valobj: lldb.SBValue, dict):
self.valobj = valobj
def has_children(self):
return True
def num_children(self):
return len(self.children)
def get_child_index(self, name):
for idx in range(self.num_children()):
if self.children[idx].GetName() == name:
return idx
return -1
def get_child_at_index(self, idx):
if idx >= 0 and idx < self.num_children():
return self.children[idx]
else:
return None
def update(self):
self.pointer = self.valobj.GetNonSyntheticValue().GetChildMemberWithName(
"pointer"
)
self.children = []
if not is_nullptr(self.pointer):
self.children = self.pointer.Dereference().children
# Slang::RefPtr summary
def RefPtr_summary(valobj: lldb.SBValue, dict) -> str:
pointer = valobj.GetNonSyntheticValue().GetChildMemberWithName("pointer")
if is_nullptr(pointer):
return "nullptr"
pointee = pointer.Dereference()
refcount = pointee.GetChildMemberWithName("referenceCount").GetValueAsUnsigned()
return str(pointer.GetValue()) + " refcount=" + str(refcount)
# Slang::ComPtr synthetic provider
class ComPtr_synthetic(lldb.SBSyntheticValueProvider):
def __init__(self, valobj: lldb.SBValue, dict):
self.valobj = valobj
def has_children(self):
return len(self.children) > 0
def num_children(self):
return len(self.children)
def get_child_index(self, name):
for idx in range(self.num_children()):
if self.children[idx].GetName() == name:
return idx
return -1
def get_child_at_index(self, idx):
if idx >= 0 and idx < self.num_children():
return self.children[idx]
else:
return None
def update(self):
self.pointer = self.valobj.GetChildMemberWithName("m_ptr")
self.children = []
if not is_nullptr(self.pointer):
self.children = self.pointer.Dereference().children
# Slang::ComPtr summary
def ComPtr_summary(valobj: lldb.SBValue, dict) -> str:
pointer = valobj.GetNonSyntheticValue().GetChildMemberWithName("m_ptr")
if is_nullptr(pointer):
return "nullptr"
return str(pointer.GetValue())
# Slang::Array synthetic provider
class Array_synthetic(lldb.SBSyntheticValueProvider):
def __init__(self, valobj: lldb.SBValue, dict):
self.valobj = valobj
def has_children(self):
return True
def num_children(self):
return self.count.GetValueAsUnsigned(0)
def get_child_index(self, name):
return int(name.lstrip("[").rstrip("]"))
def get_child_at_index(self, idx):
if idx >= 0 and idx < self.num_children():
offset = idx * self.data_size
return self.buffer.CreateChildAtOffset(
"[" + str(idx) + "]", offset, self.data_type
)
else:
return None
def update(self):
self.count = self.valobj.GetChildMemberWithName("m_count")
self.buffer = self.valobj.GetChildMemberWithName("m_buffer")
self.data_type = self.buffer.GetType().GetArrayElementType()
self.data_size = self.data_type.GetByteSize()
# Slang::List synthetic provider
class List_synthetic(lldb.SBSyntheticValueProvider):
def __init__(self, valobj: lldb.SBValue, dict):
self.valobj = valobj
def has_children(self):
return True
def num_children(self):
return self.count.GetValueAsUnsigned(0)
def get_child_index(self, name):
return int(name.lstrip("[").rstrip("]"))
def get_child_at_index(self, idx):
if idx >= 0 and idx < self.num_children():
offset = idx * self.data_size
return self.buffer.CreateChildAtOffset(
"[" + str(idx) + "]", offset, self.data_type
)
else:
return None
def update(self):
self.count = self.valobj.GetChildMemberWithName("m_count")
self.buffer = self.valobj.GetChildMemberWithName("m_buffer")
self.data_type = self.buffer.GetType().GetPointeeType()
self.data_size = self.data_type.GetByteSize()
# Slang::ShortList synthetic provider
class ShortList_synthetic(lldb.SBSyntheticValueProvider):
def __init__(self, valobj: lldb.SBValue, dict):
self.valobj = valobj
def has_children(self):
return True
def num_children(self):
return self.count.GetValueAsUnsigned(0)
def get_child_index(self, name):
return int(name.lstrip("[").rstrip("]"))
def get_child_at_index(self, idx):
if idx >= 0 and idx < self.short_count:
offset = idx * self.data_size
return self.short_buffer.CreateChildAtOffset(
"[" + str(idx) + "]", offset, self.data_type
)
elif idx >= self.short_count and idx < self.num_children():
offset = (idx - self.short_count) * self.data_size
return self.buffer.CreateChildAtOffset(
"[" + str(idx) + "]", offset, self.data_type
)
else:
return None
def update(self):
self.count = self.valobj.GetChildMemberWithName("m_count")
self.buffer = self.valobj.GetChildMemberWithName("m_buffer")
self.short_buffer = self.valobj.GetChildMemberWithName("m_shortBuffer")
self.short_count = self.short_buffer.GetNumChildren()
self.data_type = self.buffer.GetType().GetPointeeType()
self.data_size = self.data_type.GetByteSize()
def __lldb_init_module(debugger: lldb.SBDebugger, internal_dict):
if ENABLE_LOGGING:
lldb.formatters.Logger._lldb_formatters_debug_level = 2
commands = [
# Slang::String
"type summary add Slang::String -F core_lldb.String_summary -w slang",
# Slang::UnownedStringSlice
"type summary add Slang::UnownedStringSlice -F core_lldb.UnownedStringSlice_summary -w slang",
# Slang::RefPtr
'type synthetic add -x "^Slang::RefPtr<.+>$" -l core_lldb.RefPtr_synthetic -w slang',
'type summary add -x "^Slang::RefPtr<.+>$" -F core_lldb.RefPtr_summary -w slang',
# Slang::ComPtr
'type synthetic add -x "^Slang::ComPtr<.+>$" -l core_lldb.ComPtr_synthetic -w slang',
'type summary add -x "^Slang::ComPtr<.+>$" -F core_lldb.ComPtr_summary -w slang',
# Slang::Array
'type synthetic add -x "^Slang::Array<.+>$" -l core_lldb.Array_synthetic -w slang',
'type summary add --x "^Slang::Array<.+>$" --summary-string "size=${svar%#}" -w slang',
# Slang::List
'type synthetic add -x "^Slang::List<.+>$" -l core_lldb.List_synthetic -w slang',
'type summary add --expand -x "^Slang::List<.+>$" --summary-string "size=${var.m_count} capacity=${var.m_capacity}" -w slang',
# Slang::ShortList
'type synthetic add -x "^Slang::ShortList<.+>$" -l core_lldb.ShortList_synthetic -w slang',
'type summary add --expand -x "^Slang::ShortList<.+>$" --summary-string "size=${var.m_count} capacity=${var.m_capacity}" -w slang',
# Enable slang category
"type category enable slang",
]
for c in commands:
debugger.HandleCommand(c)
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