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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Address space] Missing check for validity of addr space conversions for 'this' parameter"
href="https://bugs.llvm.org/show_bug.cgi?id=41730">41730</a>
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<th>Summary</th>
<td>[Address space] Missing check for validity of addr space conversions for 'this' parameter
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>anastasia.stulova@arm.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>Currently Clang will accept invalid address space conversion generated
implicitly when passing objects to 'this' parameter.
For example:
struct MyType {
MyType(int i) : i(i) {}
int i;
};
MyType __attribute__((address_space(10))) m = 123;
This code should only be allowed if target permits conversions from AS 123 to 0
implicitly. However, we don't support yet target hooks to setup address space
conversions (explained in RFC:
<a href="http://lists.llvm.org/pipermail/cfe-dev/2019-March/061541.html">http://lists.llvm.org/pipermail/cfe-dev/2019-March/061541.html</a>) and therefore
adding such check will prevent using addr spaces in C++.
The solution to that could be addr space method qualifiers that is review:
<a href="https://reviews.llvm.org/D57464">https://reviews.llvm.org/D57464</a>
See original discussion in <a href="https://reviews.llvm.org/D59988">https://reviews.llvm.org/D59988</a>.</pre>
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