http://llvm.org/bugs/show_bug.cgi?id=20690
Bug ID: 20690
Summary: clang++ does not output Dwarf DW_AT_default_value
Debugging Information Entry
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 12910
--> http://llvm.org/bugs/attachment.cgi?id=12910&action=edit
Dwarf dump of binary compiled from included program
When compiling a C++ class with methods with default arguments, clang does not
appear to output the Dwarf debugging information entry representing a default
value. To reproduce, compile the following program on Linux (via clang++ -g
test.cc) and dump the resulting a.out file (I've attached the output of a
simple dump via pyelftools). The DW_AT_default_value attribute is not present
in the dump.
----
#include <string>
#include <iostream>
class testclass {
public:
testclass() {}
void test_method(int a = 1) {
std::cout << a << std::endl;
}
};
int
main(int argc, char** argv) {
std::string abc("abc");
testclass t;
t.test_method(8);
std::cout << abc << std::endl;
}
----
This bug occurs in clang built from LLVM version 215330, clang version 215327.
This is a problem for, e.g., calling some STL library routines from lldb, as
such routines are often documented as having fewer arguments than they are
defined with, the extra arguments being defaulted and used for, e.g.,
allocation. Without information about the default arguments, lldb cannot
present the interface to the user they expect. See
http://llvm.org/bugs/show_bug.cgi?id=20604 .
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