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<base href="https://bugs.llvm.org/">
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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 - Wrong resolving boost::variant template arguments by formatters API"
href="https://bugs.llvm.org/show_bug.cgi?id=32300">32300</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Wrong resolving boost::variant template arguments by formatters API
</td>
</tr>
<tr>
<th>Product</th>
<td>lldb
</td>
</tr>
<tr>
<th>Version</th>
<td>3.9
</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>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>lldb-dev@lists.llvm.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>andrew.stepanov.i@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>1. Use C++ code:
#include <boost/variant>
#include <vector>
#include <string>
template<typename ParentType>
struct Example
{
using Variant = boost::variant<int, std::string, std::vector<ParentType>>;
};
int main()
{
Example<float>::Variant ex(std::string("string"));
Example<float>::Variant ex2(10);
return ex.which() == ex2.which();
}
2. Use formatter for boost::variant:
import lldb
import lldb.formatters.Logger
def get_template_arg(valobj, i):
valobj_type = valobj.GetType().GetUnqualifiedType()
if valobj_type.IsReferenceType():
valobj_type = valobj_type.GetDereferencedType()
if valobj_type.GetNumberOfTemplateArguments() > i:
data_type = valobj_type.GetTemplateArgumentType(i)
else:
data_type = None
return data_type
class BoostVariantSynthProvider:
def __init__(self, valobj, dict):
self.val_obj = valobj
self.value = None
self.update()
def num_children(self):
return 1
def has_children(self):
return True
def get_child_index(self, name):
if name == "value":
return 0
return -1
def get_child_at_index(self, index):
if index == 0:
return self.value
return None
def update(self):
type_index =
self.val_obj.GetChildMemberWithName("which_").GetValueAsUnsigned()
element_type = get_template_arg(self.val_obj, type_index)
self.value =
self.val_obj.GetChildMemberWithName("storage_").GetChildMemberWithName("data_").
\
GetChildMemberWithName("buf").CreateChildAtOffset("value", 0,
element_type)
Actual:
GetNumberOfTemplateArguments() returns 1 for Example<float>::Variant type and
get_template_arg returns 'None'
Expected:
GetNumberOfTemplateArguments() should return 3 for Example<float>::Variant type
and get_template_arg should returns std::string type</pre>
</div>
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