Comment #10 on issue 3926 by [email protected]: Let/const in CaseBlock
https://code.google.com/p/v8/issues/detail?id=3926
I tested the first code interactively. No syntax error these days. f(1) =>
2; f(2) => ReferenceError; f(3) => crash! At a glance, looks like it's
trying to call ToString on the TDZ value or something like that.
dehrenberg@littledan:~/v8/v8$ out/x64.debug/d8 --harmony-sloppy
--harmony-sloppy-let
V8 version 4.6.0 (candidate)
d8> function f(x) { switch (x) { case 1: let y = 1; case 2: y = 2;
case 3: print(y); } }
undefined
d8> f(1)
2
undefined
d8> f(2)
(d8):1: ReferenceError: y is not defined
function f(x) { switch (x) { case 1: let y = 1; case 2: y = 2; case
3: print(y); } }
^
ReferenceError: y is not defined
at f ((d8):1:67)
at (d8):1:1
d8> f(3)
Stacktrace (bbbbbbbb-bbbbbbbb) 0x20ddd6a041e9 (nil):
==== JS stack trace =========================================
Security context: 0x20ddd6a04189 <undefined>
1: DefaultString(aka DefaultString) [native runtime.js:576]
[pc=0x3a3f6d8061df] (this=0x20ddd6a04189 <undefined>,h=0x20ddd6a041e9 <the
hole>)
2: ToString(aka ToString) [native runtime.js:502] [pc=0x3a3f6d73c10f]
(this=0x20ddd6a04189 <undefined>,h=0x20ddd6a041e9 <the hole>)
6: f(aka f) [(d8):1] [pc=0x3a3f6d73bec4] (this=0x20ddd6a04189
<undefined>,x=3)
7: /* anonymous */ [(d8):1] [pc=0x3a3f6d80fe22] (this=0xedc940051f9 <JS
Global Object>)
==== Details ================================================
[1]: DefaultString(aka DefaultString) [native runtime.js:576]
[pc=0x3a3f6d8061df] (this=0x20ddd6a04189 <undefined>,h=0x20ddd6a041e9 <the
hole>) {
// stack-allocated locals
var L = 0x20ddd6a04189 <undefined>
var M = 0x20ddd6a04189 <undefined>
var J = 0x20ddd6a04189 <undefined>
var K = 0x20ddd6a04189 <undefined>
// expression stack (top to bottom)
[07] : 0x36c3fb133be9 <FixedArray[18]>
[06] : 8
[05] : 0x20ddd6a54a01 <String[8]: toString>
[04] : 0x20ddd6a041e9 <the hole>
--------- s o u r c e c o d e ---------
function
DefaultString(h){\x0aif(!(%_ClassOf(h)==='Symbol')){\x0aif((typeof(h)==='symbol'))throw
MakeTypeError(115);\x0avar
L=h.toString;\x0aif((%_ClassOf(L)==='Function')){\x0avar
M=%_CallFunction(h,L);\x0aif(IsPrimitive(M))return M;\x0a}\x0avar
J=h.valueOf;\x0aif((%_ClassOf(J)==='Function')){\x0avar
K=%_CallFunction(h,J);\x0aif(IsPrimitive(K))return K...
-----------------------------------------
}
[2]: ToString(aka ToString) [native runtime.js:502] [pc=0x3a3f6d73c10f]
(this=0x20ddd6a04189 <undefined>,h=0x20ddd6a041e9 <the hole>) {
// expression stack (top to bottom)
[04] : 0x20ddd6a041e9 <the hole>
[03] : 0x20ddd6a04189 <undefined>
[02] : 0x20ddd6ac9b61 <JS Function DefaultString (SharedFunctionInfo
0x20ddd6a637f9)>
[01] : 0x20ddd6a04189 <undefined>
[00] : 0x20ddd6ac9a41 <JS Function ToString (SharedFunctionInfo
0x20ddd6a62ee1)>
--------- s o u r c e c o d e ---------
function ToString(h){\x0aif((typeof(h)==='string'))return
h;\x0aif((typeof(h)==='number'))return %_NumberToString(h);\x0aif((typeof(h)==='boolean'))return
h?'true':'false';\x0aif((h===(void
0)))return'undefined';\x0areturn((h===null))?'null':ToString(DefaultString(h));\x0a}
-----------------------------------------
}
[6]: f(aka f) [(d8):1] [pc=0x3a3f6d73bec4] (this=0x20ddd6a04189
<undefined>,x=3) {
// stack-allocated locals
var y = 0x20ddd6a041e9 <the hole>
// expression stack (top to bottom)
[04] : 0x20ddd6ae6639 <JS Function print (SharedFunctionInfo
0x20ddd6ae65a1)>
[03] : 0x20ddd6a041e9 <the hole>
[02] : 0xedc940051f9 <JS Global Object>
[01] : 0x20ddd6ae6639 <JS Function print (SharedFunctionInfo
0x20ddd6ae65a1)>
--------- s o u r c e c o d e ---------
function f(x) { switch (x) { case 1: let y = 1; case 2: y = 2; case
3: print(y); } }
-----------------------------------------
}
[7]: /* anonymous */ [(d8):1] [pc=0x3a3f6d80fe22] (this=0xedc940051f9 <JS
Global Object>) {
// stack-allocated locals
var .result = 0x20ddd6a04189 <undefined>
// expression stack (top to bottom)
[03] : 3
[02] : 0x20ddd6a04189 <undefined>
[01] : 0x36c3fb12e499 <JS Function f (SharedFunctionInfo 0x36c3fb12e249)>
--------- s o u r c e c o d e ---------
f(3)
-----------------------------------------
}
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