https://llvm.org/bugs/show_bug.cgi?id=27567
Bug ID: 27567
Summary: Member expressions have wrong debug column information
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: hfin...@anl.gov
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Consider the following:
$ cat -n /tmp/i.cpp
1 void ext();
2
3 struct Bar {
4 void bar() { ext(); }
5 };
6
7 struct Foo {
8 Bar *b;
9
10 Bar *foo() { return b; }
11 };
12
13 void test(Foo *f) {
14 f->foo()->bar();
15 }
16
Running:
$ clang -g /tmp/i.cpp -S -emit-llvm -o -
we see...
define void @_Z4testP3Foo(%struct.Foo* %f) #0 !dbg !6 {
...
%call = call %struct.Bar* @_ZN3Foo3fooEv(%struct.Foo* %0), !dbg !27
call void @_ZN3Bar3barEv(%struct.Bar* %call), !dbg !28
...
!27 = !DILocation(line: 14, column: 3, scope: !6)
!28 = !DILocation(line: 14, column: 3, scope: !29)
so the two call instructions both point to the 'f' in 'f->foo()->bar()', not to
the calls to 'foo()' and 'bar()' themselves.
Running:
$ clang -g /tmp/i.cpp -S -emit-llvm -o - -Xclang -ast-dump
we see...
`-FunctionDecl 0x5ce7cd0 <line:13:1, line:15:1> line:13:6 test 'void (struct
Foo *)'
|-ParmVarDecl 0x5ce7c08 <col:11, col:16> col:16 used f 'struct Foo *'
`-CompoundStmt 0x5ce7e80 <col:19, line:15:1>
`-CXXMemberCallExpr 0x5ce7e58 <line:14:3, col:17> 'void'
`-MemberExpr 0x5ce7e20 <col:3, col:13> '<bound member function type>'
->bar 0x5ce7640
`-CXXMemberCallExpr 0x5ce7df8 <col:3, col:10> 'struct Bar *'
`-MemberExpr 0x5ce7dc0 <col:3, col:6> '<bound member function type>'
->foo 0x5ce7a80
`-ImplicitCastExpr 0x5ce7da8 <col:3> 'struct Foo *'
<LValueToRValue>
`-DeclRefExpr 0x5ce7d80 <col:3> 'struct Foo *' lvalue ParmVar
0x5ce7c08 'f' 'struct Foo *'
So the correct column numbers, 6 and 13, are the second location in the
MemberExpr nodes, not the first. Those second locations should end up in the
debug info.
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