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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Print frame index offsets with symbolic labels when outputting verbose assembly"
href="https://bugs.llvm.org/show_bug.cgi?id=42904">42904</a>
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<th>Summary</th>
<td>Print frame index offsets with symbolic labels when outputting verbose assembly
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Common Code Generator Code
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>rnk@google.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Consider MSVC's assembly output for this program:
<a href="https://gcc.godbolt.org/z/wdAp5O">https://gcc.godbolt.org/z/wdAp5O</a>
int addit(int x, int y) {
return x + y;
}
_x$ = 8 ; size = 4
_y$ = 12 ; size = 4
int addit(int,int) PROC ; addit
push ebp
mov ebp, esp
mov eax, DWORD PTR _x$[ebp]
add eax, DWORD PTR _y$[ebp]
pop ebp
ret 0
int addit(int,int) ENDP ; addit
When a local variable offset is used, the compiler prints it using a symbolic
label. The labels are set up prior to the prologue. This should produce the
same object file as using plain integer offsets, but it's way more readable,
which is helpful to any user attempting to understand compiler output. We
should also consider how useful it might be when writing FileCheck tests.
I think we can already put MCSymbols into a MachineOperand, we just need to
make sure that operand can carry an offset, and that anything that runs after
PEI knows how to handle such operands.
It's not clear to me how we'd want to determine the local variable name for an
alloca. Value names are discarded in release builds, but debug info is also not
always present.</pre>
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