Bug 174781
| Summary: | [JSC] ArrayProfile and ValueProfile indice should be stored in unsignedValue in Instruction | ||
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| Product: | WebKit | Reporter: | Yusuke Suzuki <ysuzuki> |
| Component: | JavaScriptCore | Assignee: | Yusuke Suzuki <ysuzuki> |
| Status: | NEW | ||
| Severity: | Normal | CC: | cgarcia, mark.lam, saam |
| Priority: | P2 | ||
| Version: | WebKit Nightly Build | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
Yusuke Suzuki
In UnlinkedCodeBlock, their value should be placed in unsignedValue field.
| Attachments | ||
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| Add attachment proposed patch, testcase, etc. |
Yusuke Suzuki
The problem is that StructureForInContext already uses `unsignedValue` field to store array profile and value profile.
However, when using these numbers in CodeBlock, we use `operand` field. That causes undefined behavior. (accessing inactive union member).