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"""
This python script provides LLDB formatters for Slang IR types.
To use it, see the `docs/debugging.md` file in this repo.
"""
import json
import lldb
class Children:
indices: dict[str, int]
values: list[lldb.SBValue]
def __init__(self):
self.indices = {}
self.values = []
def append(self, value: lldb.SBValue) -> None:
self.indices[value.name] = len(self.values)
self.values.append(value)
def __len__(self) -> int:
return len(self.values)
def get_index(self, name: str) -> int:
return self.indices[name]
def get_at_index(self, idx: int) -> lldb.SBValue:
return self.values[idx]
def IRUse_summary(valobj: lldb.SBValue, dict) -> str:
val = valobj.GetNonSyntheticValue()
return val.GetChildMemberWithName("usedValue").deref.summary
class IRInstListBase_synthetic(lldb.SBSyntheticValueProvider):
def __init__(self, valobj: lldb.SBValue, dict):
self.valobj = valobj
def num_children(self):
return len(self.children)
def get_child_index(self, name):
return self.children.get_index(name)
def get_child_at_index(self, idx):
return self.children.get_at_index(idx)
def update(self):
self.children = Children()
pointer = self.valobj.GetChildMemberWithName("first")
i = 0
while pointer.unsigned != 0:
child = pointer.deref
self.children.append(child.Clone(f"[{i}]"))
pointer = child.GetNonSyntheticValue().GetChildMemberWithName("next")
i += 1
def has_children(self):
return True
class IRInst_synthetic(lldb.SBSyntheticValueProvider):
def __init__(self, valobj: lldb.SBValue, dict):
self.valobj = valobj
def num_children(self):
return len(self.children)
def get_child_index(self, name):
return self.children.get_index(name)
def get_child_at_index(self, idx):
return self.children.get_at_index(idx)
def update(self):
self.children = Children()
target = self.valobj.target
ty = self.valobj.type
op = self.valobj.GetChildMemberWithName("m_op")
# literal values
value: list[tuple[str, lldb.SBValue]] = []
match op.value:
case "kIROp_StringLit":
string_lit_t = target.FindFirstType("Slang::IRStringLit")
string_lit = self.valobj.Cast(string_lit_t)
val = string_lit.GetChildMemberWithName("value")
value = [("[value]", val.GetChildMemberWithName("stringVal"))]
case "kIROp_IntLit":
int_lit_t = target.FindFirstType("Slang::IRIntLit")
int_lit = self.valobj.Cast(int_lit_t)
val = int_lit.GetChildMemberWithName("value")
value = [("[value]", val.GetChildMemberWithName("intVal"))]
# operands
operands: list[tuple[str, lldb.SBValue]] = []
offset = ty.GetByteSize()
ir_use_t = target.FindFirstType("Slang::IRUse")
ir_use_size = ir_use_t.GetByteSize()
for index in range(self.valobj.GetChildMemberWithName("operandCount").unsigned):
name = f"[operand{index}]"
operand = self.valobj.CreateChildAtOffset(
name, offset + index * ir_use_size, ir_use_t
)
operands.append((name, operand))
for name, child in [
("[op]", op),
("[UID]", self.valobj.GetChildMemberWithName("_debugUID")),
(
"[type]",
self.valobj.GetChildMemberWithName("typeUse").GetChildMemberWithName(
"usedValue"
),
),
# TODO: [exportName]
# TODO: [importName]
# TODO: [name]
*value,
*operands,
(
"[decorations/children]",
self.valobj.GetChildMemberWithName("m_decorationsAndChildren"),
),
("[parent]", self.valobj.GetChildMemberWithName("parent")),
# TODO: Traverse the linked list to show all uses next to
# each other, rather than pointing to the first one.
("[uses]", self.valobj.GetChildMemberWithName("firstUse")),
]:
self.children.append(child.Clone(name))
def has_children(self):
return True
def IRInst_summary(valobj: lldb.SBValue, dict) -> str:
val = valobj.GetNonSyntheticValue()
op = val.GetChildMemberWithName("m_op")
return f"{{{op.value} {val.address_of.value}}}"
def stringval_summary(valobj: lldb.SBValue) -> str:
val = valobj.GetNonSyntheticValue()
num_chars = val.GetChildMemberWithName("numChars").unsigned
chars = val.GetChildMemberWithName("chars").GetPointeeData(0, num_chars).uint8
return json.dumps("".join(chr(chars[i]) for i in range(num_chars)))
def StringValue_summary(valobj: lldb.SBValue, dict) -> str:
return stringval_summary(valobj)
def StringSliceValue_summary(valobj: lldb.SBValue, dict) -> str:
return stringval_summary(valobj)
def __lldb_init_module(debugger: lldb.SBDebugger, internal_dict):
commands = [
# Slang::IRUse
"type summary add Slang::IRUse -F slang_lldb.IRUse_summary -w slang",
# Slang::IRInstListBase
"type synthetic add Slang::IRInstListBase -l slang_lldb.IRInstListBase_synthetic -w slang",
# Slang::IRInst
"type synthetic add Slang::IRInst -l slang_lldb.IRInst_synthetic -w slang",
"type summary add --expand Slang::IRInst -F slang_lldb.IRInst_summary -w slang",
# Slang::IRConstant::StringValue
"type summary add Slang::IRConstant::StringValue -F slang_lldb.StringValue_summary -w slang",
# Slang::IRConstant::StringSliceValue
"type summary add Slang::IRConstant::StringSliceValue -F slang_lldb.StringSliceValue_summary -w slang",
# Enable slang category
"type category enable slang",
]
for c in commands:
debugger.HandleCommand(c)
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