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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang objective-c++ incorrect mangling for function with multiple id parameters"
href="http://llvm.org/bugs/show_bug.cgi?id=21688">21688</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang objective-c++ incorrect mangling for function with multiple id parameters
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.5
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>joao@abecasis.name
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider:
// mangling.cpp
struct objc_selector;
struct objc_object;
typedef struct objc_selector *SEL;
typedef struct objc_object *id;
struct NSObject;
void good1(id, id) { }
void good2(struct NSObject *, id, id) { }
void good3(struct NSObject *, SEL, id) { }
void bad1(struct NSObject *, SEL, id, id) { }
void bad2(struct NSObject *, SEL, id, id, id) { }
Compiling this code as Objective C++ generates what seems to be incorrect name
mangling for the "bad" functions:
$ clang++ -x objective-c++ -c mangling.cc && nm mangling.o | c++filt
0000000000000138 short EH_frame0
0000000000000050 T bad1(NSObject*, objc_selector*, objc_object*, objc_object)
00000000000001c8 S bad1(NSObject*, objc_selector*, objc_object*, objc_object)
(.eh)
0000000000000070 T bad2(NSObject*, objc_selector*, objc_object*, objc_object,
objc_object)
00000000000001f0 S bad2(NSObject*, objc_selector*, objc_object*, objc_object,
objc_object) (.eh)
0000000000000000 T good1(objc_object*, objc_object*)
0000000000000150 S good1(objc_object*, objc_object*) (.eh)
0000000000000010 T good2(NSObject*, objc_object*, objc_object*)
0000000000000178 S good2(NSObject*, objc_object*, objc_object*) (.eh)
0000000000000030 T good3(NSObject*, objc_selector*, objc_object*)
00000000000001a0 S good3(NSObject*, objc_selector*, objc_object*) (.eh)
Compiling as C++ generates what seems to be the correct mangling:
$ clang++ -x c++ -c mangling.cc && nm mangling.o | c++filt
0000000000000130 short EH_frame0
0000000000000050 T bad1(NSObject*, objc_selector*, objc_object*,
objc_object*)
00000000000001c0 S bad1(NSObject*, objc_selector*, objc_object*,
objc_object*) (.eh)
0000000000000070 T bad2(NSObject*, objc_selector*, objc_object*,
objc_object*, objc_object*)
00000000000001e8 S bad2(NSObject*, objc_selector*, objc_object*,
objc_object*, objc_object*) (.eh)
0000000000000000 T good1(objc_object*, objc_object*)
0000000000000148 S good1(objc_object*, objc_object*) (.eh)
0000000000000010 T good2(NSObject*, objc_object*, objc_object*)
0000000000000170 S good2(NSObject*, objc_object*, objc_object*) (.eh)
0000000000000030 T good3(NSObject*, objc_selector*, objc_object*)
0000000000000198 S good3(NSObject*, objc_selector*, objc_object*) (.eh)
My main issue here is that the mangling is inconsistent if code is compiled as
Objective-C++ or C++, which prevents using a function compiled as Objective C++
to be used in plain C++.</pre>
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