https://llvm.org/bugs/show_bug.cgi?id=26694
Bug ID: 26694
Summary: Expression evaluation broken
for__attribute__((overloadable))
Product: lldb
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: lldb-dev@lists.llvm.org
Reporter: e...@codeplay.com
CC: llvm-b...@lists.llvm.org, scalla...@apple.com
Classification: Unclassified
Created attachment 15932
--> https://llvm.org/bugs/attachment.cgi?id=15932&action=edit
Example C file and compiled binary
Commit r260768 broke expression evaluation for C functions with
__attribute__((overloadable))
See attached example compiled with clang -g -O0
Before this commit the correct decl of evaluated function 'MyFunc' was chosen.
(lldb) target create "overloadable"
Current executable set to 'overloadable' (x86_64).
(lldb) b 19
Breakpoint 1: where = overloadable`main + 44 at overloadable.c:19, address =
0x00000000004005bc
(lldb) r
Process 7127 launched: '/home/ewan/Desktop/Scratch/overloadable' (x86_64)
This is a float function
This is an integer function
Process 7127 stopped
* thread #1: tid = 7127, 0x00000000004005bc overloadable`main + 44 at
overloadable.c:19, name = 'overloadable', stop reason = breakpoint 1.1
frame #0: 0x00000000004005bc overloadable`main + 44 at overloadable.c:19
16 MyFunc(2.0f);
17 int x = MyFunc(2);
18
-> 19 return 0;
20 }
(lldb) expr -- MyFunc('a')
This is an integer function
(int) $0 = 97
(lldb) expr -- MyFunc(2)
This is an integer function
(int) $1 = 2
(lldb) expr -- MyFunc(2.0f)
This is a float function
Now however the the first decl looks like it's always chosen, incorrectly in
these cases.
(lldb) target create "overloadable"
Current executable set to 'overloadable' (x86_64).
(lldb) b 19
Breakpoint 1: where = overloadable`main + 44 at overloadable.c:19, address =
0x00000000004005bc
(lldb) r
Process 6992 launched: '/home/ewan/Desktop/Scratch/overloadable' (x86_64)
This is a float function
This is an integer function
Process 6992 stopped
* thread #1: tid = 6992, 0x00000000004005bc overloadable`main + 44 at
overloadable.c:19, name = 'overloadable', stop reason = breakpoint 1.1
frame #0: 0x00000000004005bc overloadable`main + 44 at overloadable.c:19
16 MyFunc(2.0f);
17 int x = MyFunc(2);
18
-> 19 return 0;
20 }
(lldb) expr -- MyFunc('a')
This is a float function
(int) $0 = 25
(lldb) expr -- MyFunc(2)
This is a float function
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