<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - function creation crash in getContext()"
href="https://bugs.llvm.org/show_bug.cgi?id=34673">34673</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>function creation crash in getContext()
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>5.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Core LLVM classes
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>guillaume@morinfr.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=19174" name="attach_19174" title="testcase">attachment 19174</a> <a href="attachment.cgi?id=19174&action=edit" title="testcase">[details]</a></span>
testcase
This simple code worked just fine with llvm 4.0. It crashes with llvm 5.0. I
am really sorry if this is an issue with the code but can't see anything wrong:
$ cat llvm5_bug.cpp
#include <llvm/IR/Module.h>
#include <llvm/IR/LLVMContext.h>
#include <llvm/IR/Type.h>
#include <memory>
#include <string>
int main(void)
{
llvm::LLVMContext globalCtx;
std::unique_ptr<llvm::Module> module(new llvm::Module("m", globalCtx));
llvm::Type* argType = llvm::IntegerType::get(globalCtx, 8 * sizeof(short));
llvm::Type* retType = llvm::IntegerType::get(globalCtx, 8 * sizeof(long));
std::string name("funcName");
llvm::Constant* c = module->getOrInsertFunction(name, retType, argType,
nullptr);
llvm::Function* func = llvm::cast<llvm::Function>(c);
func->arg_begin(); // crashes in here with llvm 5.0
return 0;
}
$ g++-7 -Wall $(llvm-config-5.0 --libs --cflags) -o c llvm5_bug.cpp
$ ./c
Segmentation fault (core dumped)
Backtrace:
0x00007ffff51408b3 in llvm::Value::getContext() const () at
/build/llvm-toolchain-5.0-5.0/lib/IR/Value.cpp:697
697 /build/llvm-toolchain-5.0-5.0/lib/IR/Value.cpp: No such file or
directory.
(gdb) bt
#0 0x00007ffff51408b3 in llvm::Value::getContext() const () at
/build/llvm-toolchain-5.0-5.0/lib/IR/Value.cpp:697
#1 0x00007ffff514112c in llvm::Value::setNameImpl(llvm::Twine const&) () at
/build/llvm-toolchain-5.0-5.0/lib/IR/Value.cpp:229
#2 0x00007ffff51413a9 in llvm::Value::setName(llvm::Twine const&) () at
/build/llvm-toolchain-5.0-5.0/lib/IR/Value.cpp:285
#3 0x00007ffff50c91ea in llvm::Function::BuildLazyArguments() const () at
/build/llvm-toolchain-5.0-5.0/lib/IR/Function.cpp:257
#4 0x0000000000400d55 in llvm::Function::CheckLazyArguments (this=<optimized
out>) at /usr/lib/llvm-5.0/include/llvm/IR/Function.h:109
#5 llvm::Function::arg_begin (this=<optimized out>) at
/usr/lib/llvm-5.0/include/llvm/IR/Function.h:596
#6 main () at llvm5_bug.cpp:20</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>