output.log

❯ ./out/x64.optdebug/d8 --allow-natives-syntax teststack.js
DebugPrint: 0x2bf167d0b3f9: [JS_ERROR_TYPE]
 - map: 0x2bf153b4a549 <Map(HOLEY_ELEMENTS)> [FastProperties]
 - prototype: 0x2bf15ffc62e1 <Object map = 0x2bf153b40fe9>
 - elements: 0x2bf156880c21 <FixedArray[0]> [HOLEY_ELEMENTS]
 - properties: 0x2bf156880c21 <FixedArray[0]> {
    #stack: 0x2bf1946002f9 <AccessorInfo> (const accessor descriptor)
    0x2bf156884a71 <Symbol: (stack_trace_symbol)>: 0x2bf167d0b619 <FixedArray[1]> (const data field 0)
 }
0x2bf153b4a549: [Map]
 - type: JS_ERROR_TYPE
 - instance size: 40
 - inobject properties: 2
 - elements kind: HOLEY_ELEMENTS
 - unused property fields: 1
 - enum length: invalid
 - stable_map
 - back pointer: 0x2bf153b40f99 <Map(HOLEY_ELEMENTS)>
 - prototype_validity cell: 0x2bf194600609 <Cell value= 1>
 - instance descriptors (own) #2: 0x2bf167d0b659 <DescriptorArray[2]>
 - layout descriptor: 0x0
 - prototype: 0x2bf15ffc62e1 <Object map = 0x2bf153b40fe9>
 - constructor: 0x2bf15ffc61b1 <JSFunction Error (sfi = 0x2bf19460fcc9)>
 - dependent code: 0x2bf1568802c1 <Other heap object (WEAK_FIXED_ARRAY_TYPE)>
 - construction counter: 0

{"value":"Error\n    at teststack.js:1:13","writable":true,"enumerable":false,"configurable":true}
DebugPrint: 0x2bf167d0b3f9: [JS_ERROR_TYPE]
 - map: 0x2bf153b4a549 <Map(HOLEY_ELEMENTS)> [FastProperties]
 - prototype: 0x2bf15ffc62e1 <Object map = 0x2bf153b40fe9>
 - elements: 0x2bf156880c21 <FixedArray[0]> [HOLEY_ELEMENTS]
 - properties: 0x2bf156880c21 <FixedArray[0]> {
    #stack: 0x2bf1946002f9 <AccessorInfo> (const accessor descriptor)
    0x2bf156884a71 <Symbol: (stack_trace_symbol)>: 0x2bf167d0b6a1 <String[30]\: Error\n    at teststack.js:1:13> (data field 0)
 }
0x2bf153b4a549: [Map]
 - type: JS_ERROR_TYPE
 - instance size: 40
 - inobject properties: 2
 - elements kind: HOLEY_ELEMENTS
 - unused property fields: 1
 - enum length: invalid
 - stable_map
 - back pointer: 0x2bf153b40f99 <Map(HOLEY_ELEMENTS)>
 - prototype_validity cell: 0x2bf194600609 <Cell value= 1>
 - instance descriptors (own) #2: 0x2bf167d0b659 <DescriptorArray[2]>
 - layout descriptor: 0x0
 - prototype: 0x2bf15ffc62e1 <Object map = 0x2bf153b40fe9>
 - constructor: 0x2bf15ffc61b1 <JSFunction Error (sfi = 0x2bf19460fcc9)>
 - dependent code: 0x2bf1568802c1 <Other heap object (WEAK_FIXED_ARRAY_TYPE)>
 - construction counter: 0

DebugPrint: 0x2bf167d0b961: [JS_OBJECT_TYPE]
 - map: 0x2bf153b465d9 <Map(HOLEY_ELEMENTS)> [DictionaryProperties]
 - prototype: 0x2bf15ffc2099 <Object map = 0x2bf153b40229>
 - elements: 0x2bf156880c21 <FixedArray[0]> [HOLEY_ELEMENTS]
 - properties: 0x2bf167d0bc01 <NameDictionary[17]> {
   0x2bf156884a71 <Symbol: (stack_trace_symbol)>: 0x2bf167d0bb91 <FixedArray[1]> (data, dict_index: 1, attrs: [W_C])
   #stack: 0x2bf1946002f9 <AccessorInfo> (accessor, dict_index: 2, attrs: [W_C])
 }
0x2bf153b465d9: [Map]
 - type: JS_OBJECT_TYPE
 - instance size: 24
 - inobject properties: 0
 - elements kind: HOLEY_ELEMENTS
 - unused property fields: 0
 - enum length: invalid
 - dictionary_map
 - may_have_interesting_symbols
 - back pointer: 0x2bf1568804d1 <undefined>
 - prototype_validity cell: 0x2bf194600609 <Cell value= 1>
 - instance descriptors (own) #0: 0x2bf156880259 <DescriptorArray[0]>
 - layout descriptor: 0x0
 - prototype: 0x2bf15ffc2099 <Object map = 0x2bf153b40229>
 - constructor: 0x2bf15ffc20d1 <JSFunction Object (sfi = 0x2bf194609ae1)>
 - dependent code: 0x2bf1568802c1 <Other heap object (WEAK_FIXED_ARRAY_TYPE)>
 - construction counter: 0

{"value":"Error\n    at teststack.js:6:7","writable":true,"enumerable":false,"configurable":true}
DebugPrint: 0x2bf167d0b961: [JS_OBJECT_TYPE]
 - map: 0x2bf153b465d9 <Map(HOLEY_ELEMENTS)> [DictionaryProperties]
 - prototype: 0x2bf15ffc2099 <Object map = 0x2bf153b40229>
 - elements: 0x2bf156880c21 <FixedArray[0]> [HOLEY_ELEMENTS]
 - properties: 0x2bf167d0bc01 <NameDictionary[17]> {
   0x2bf156884a71 <Symbol: (stack_trace_symbol)>: 0x2bf167d0bc99 <String[29]\: Error\n    at teststack.js:6:7> (data, dict_index: 1, attrs: [W_C])
   #stack: 0x2bf1946002f9 <AccessorInfo> (accessor, dict_index: 2, attrs: [W_C])
 }
0x2bf153b465d9: [Map]
 - type: JS_OBJECT_TYPE
 - instance size: 24
 - inobject properties: 0
 - elements kind: HOLEY_ELEMENTS
 - unused property fields: 0
 - enum length: invalid
 - dictionary_map
 - may_have_interesting_symbols
 - back pointer: 0x2bf1568804d1 <undefined>
 - prototype_validity cell: 0x2bf194600609 <Cell value= 1>
 - instance descriptors (own) #0: 0x2bf156880259 <DescriptorArray[0]>
 - layout descriptor: 0x0
 - prototype: 0x2bf15ffc2099 <Object map = 0x2bf153b40229>
 - constructor: 0x2bf15ffc20d1 <JSFunction Object (sfi = 0x2bf194609ae1)>
 - dependent code: 0x2bf1568802c1 <Other heap object (WEAK_FIXED_ARRAY_TYPE)>
 - construction counter: 0

testlazystack.js

const err = new Error();
%DebugPrint(err);
print(JSON.stringify(Object.getOwnPropertyDescriptor(err, 'stack')));
%DebugPrint(err);
const obj = {};
Error.captureStackTrace(obj);
%DebugPrint(obj);
print(JSON.stringify(Object.getOwnPropertyDescriptor(obj, 'stack')));
%DebugPrint(obj);