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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 - The 'cleanuppad' IR instruction doesn't work on Linux"
href="https://bugs.llvm.org/show_bug.cgi?id=45527">45527</a>
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<tr>
<th>Summary</th>
<td>The 'cleanuppad' IR instruction doesn't work on Linux
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>10.0
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Core LLVM classes
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>akornilov.82@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23347" name="attach_23347" title="ex-cleanuppad.ll">attachment 23347</a> <a href="attachment.cgi?id=23347&action=edit" title="ex-cleanuppad.ll">[details]</a></span>
ex-cleanuppad.ll
I have prepared this simple example of using cleanup for Linux with 'old'
instruction 'landingpad':
; ModuleID = 'ex-landingpad.bc'
source_filename = "ExTest.cpp"
@_ZTIi = external constant i8*
declare i8* @__cxa_allocate_exception(i64)
declare void @__cxa_throw(i8*, i8*, i8*)
declare void @__jetvm_backtrace(i32)
define i32 @sum(i32 %0, i32 %1) {
%3 = call i8* @__cxa_allocate_exception(i64 4)
store i8 33, i8* %3
call void @__cxa_throw(i8* %3, i8* bitcast (i8** @_ZTIi to i8*), i8* null)
unreachable
}
; Function Attrs: noinline optnone uwtable
define i32 @calc() #0 personality i8* bitcast (i32 (...)* @__gxx_personality_v0
to i8*) {
%1 = alloca i8*
%2 = invoke i32 @sum(i32 99, i32 77)
to label %3 unwind label %4
3: ; preds = %0
ret i32 %2
4: ; preds = %0
%5 = landingpad { i8*, i32 }
cleanup
; Some cleanup actions
resume { i8*, i32 } %5
}
declare i32 @__gxx_personality_v0(...)
attributes #0 = { noinline optnone uwtable }
It works fine on Linux. After that I have tried to use 'new' instruction
'cleanuppad':
; ModuleID = 'ex-cleanuppad.bc'
source_filename = "ExTest.cpp"
@_ZTIi = external constant i8*
declare i8* @__cxa_allocate_exception(i64)
declare void @__cxa_throw(i8*, i8*, i8*)
declare void @__jetvm_backtrace(i32)
define i32 @sum(i32 %0, i32 %1) {
%3 = call i8* @__cxa_allocate_exception(i64 4)
store i8 33, i8* %3
call void @__cxa_throw(i8* %3, i8* bitcast (i8** @_ZTIi to i8*), i8* null)
unreachable
}
; Function Attrs: noinline optnone uwtable
define i32 @calc() #0 personality i8* bitcast (i32 (...)* @__gxx_personality_v0
to i8*) {
%1 = invoke i32 @sum(i32 99, i32 77)
to label %2 unwind label %3
2: ; preds = %0
ret i32 %1
3: ; preds = %0
%4 = cleanuppad within none []
; Some cleanup actions
cleanupret from %4 unwind to caller
}
declare i32 @__gxx_personality_v0(...)
attributes #0 = { noinline optnone uwtable }
But application crashes in this case.
I obtained assembler versions (x86_64) of IR by LLC and have noticed that in
'landingpad' case instruction 'resume' transformed into _Unwind_Resume. But for
'cleanupret' just 'retq' generated.
All files are attached to this ticket.</pre>
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