[Webkit-unassigned] [Bug 203555] New: codeBlock->expressionRangeForBytecodeIndex() returns wrong range for op_to_this
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Tue Oct 29 00:27:07 PDT 2019
https://bugs.webkit.org/show_bug.cgi?id=203555
Bug ID: 203555
Summary: codeBlock->expressionRangeForBytecodeIndex() returns
wrong range for op_to_this
Product: WebKit
Version: Other
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: JavaScriptCore
Assignee: webkit-unassigned at lists.webkit.org
Reporter: tuomas.webkit at apple.com
Created attachment 382162
--> https://bugs.webkit.org/attachment.cgi?id=382162&action=review
repro case
for the JavaScript:
> function foo() {
> this;
> Array.prototype;
> }
>
> foo();
> foo();
bytecode is:
> foo#DDE7H8:[0x106ba0140->0x106bc7b80, NoneFunctionCall, 32]: 9 instructions (0 16-bit instructions, 0 32-bit instructions, 4 instructions with metadata); 140 bytes (108 metadata bytes); 1 parameter(s); 10 callee register(s); 6 variable(s); scope at loc4
> [ 0] enter
> [ 1] get_scope loc4
> [ 3] mov loc5, loc4
> [ 6] check_traps
> [ 7] to_this this
> [ 10] resolve_scope loc7, loc4, 0, GlobalProperty, 0
> [ 17] get_from_scope loc8, loc7, 0, 2048<ThrowIfNotFound|GlobalProperty|NotInitialization>, 0, 0
> [ 25] get_by_id loc6, loc8, 1, id: prototype
> [ 30] ret Undefined(const0)
>
> Identifiers:
> id0 = Array
> id1 = prototype
>
> Constants:
> k0 = Undefined
codeBlock->unlinkedCodeBlock()->dumpExpressionRangeInfo() outputs:
> UnlinkedCodeBlock 0x106b98000 expressionRangeInfo[2] {
> [0] pc 10 @ line 2 col 7 : op_resolve_scope
> [1] pc 25 @ line 2 col 7 : op_get_by_id
> }
calling codeBlock->expressionRangeForBytecodeIndex() on the op_to_this bytecode at 7 returns:
> divot: 27, startOffset: 5, endOffset: 0, source: "Array"
the expected source is "this"
there is no expressionRangeInfo that corresponds to "this" at all.
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