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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Integrated assembler errors on #(label-.-8): error: constant expression expected"
href="https://bugs.llvm.org/show_bug.cgi?id=46919">46919</a>
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<th>Summary</th>
<td>Integrated assembler errors on #(label-.-8): error: constant expression expected
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: ARM
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>i@maskray.me
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, smithp352@googlemail.com, Ties.Stuij@arm.com
</td>
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<p>
<div>
<pre>cat > a.s <<e
str r1, [pc, #(rewrite_3 - . - 8)]
cmp r0, #0
nop
rewrite_3:
e
% llvm-mc -filetype=obj -triple armv8 a.s
a.s:1:15: error: constant expression expected
str r1, [pc, #(rewrite_3 - . - 8)]
^
This may be tricky to fix because when #(rewrite_1 - . - 8) is parsed, we don't
know rewrite_1 is defined and thus we cannot fold `rewrite_1 - .`
The `MCConstExpr *` operand is immediately stored to to the
ARMOperand::MemoryOp::OffsetImm field. The field is referenced ~80 times and
many use sites assume that it is a MCConstantExpr. We may have to defer the
creation of the field to address the issue.
Call stack:
llvm/lib/MC/MCParser/AsmParser.cpp AsmParser::Run
llvm/lib/MC/MCParser/AsmParser.cpp AsmParser::parseStatement
llvm/include/llvm/MC/MCParser/MCTargetAsmParser.h
MCTargetAsmParser::ParseInstruction
llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp ARMAsmParser::ParseInstruction
llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp ARMAsmParser::parseOperand
llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp ARMAsmParser::parseMemory</pre>
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