https://llvm.org/bugs/show_bug.cgi?id=24074
Bug ID: 24074
Summary: lldb incorrectly displays typedefs in different
lexical scopes
Product: lldb
Version: unspecified
Hardware: PC
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: lldb-dev@cs.uiuc.edu
Reporter: varvara.rainc...@gmail.com
Classification: Unclassified
cat test.c
int main( void ) {
int c = 0;
while (c <= 1) {
if (c != 1) {
typedef int a;
a b;
b = 0;
} else {
typedef float a;
a b;
b = 0;
}
c++;
}
return 0;
}
I'm compiling this test with icc:
icc -c -g -O0 test.c
icc -o test.exe -O0 -g test.o
I see that icc generates correct debug info: each typedef goes to its own
lexical scope.
dwarfdump test.o
...
0x000000e7: TAG_lexical_block [5] *
AT_decl_line( 4 )
AT_decl_file( "/Applications/test/test.c" )
AT_low_pc( 0x000000000000001f )
AT_high_pc( 0x0000000000000028 )
0x000000fa: TAG_variable [4]
AT_decl_line( 6 )
AT_decl_file( "/Applications/test/test.c" )
AT_name( "b" )
AT_type( {0x00000106} ( a ) )
AT_location( rbp-12 )
0x00000106: TAG_typedef [6]
AT_decl_line( 5 )
AT_decl_file( "/Applications/test/test.c" )
AT_name( "a" )
AT_type( {0x000000b6} ( int ) )
0x0000010f: NULL
0x00000110: TAG_lexical_block [5] *
AT_decl_line( 8 )
AT_decl_file( "/Applications/test/test.c" )
AT_low_pc( 0x0000000000000028 )
AT_high_pc( 0x0000000000000030 )
0x00000123: TAG_variable [4]
AT_decl_line( 10 )
AT_decl_file( "/Applications/test/test.c" )
AT_name( "b" )
AT_type( {0x0000012f} ( a ) )
AT_location( rbp-8 )
0x0000012f: TAG_typedef [6]
AT_decl_line( 9 )
AT_decl_file( "/Applications/test/test.c" )
AT_name( "a" )
AT_type( {0x0000013a} ( float ) )
0x00000138: NULL
But, lldb displays wrong type for second typedef:
lldb test.exe
(lldb) target create "test.exe"
Current executable set to 'test.exe' (x86_64).
(lldb) b 7
Breakpoint 1: where = test.exe`main + 31 at test.c:7, address =
0x0000000100000f97
(lldb) b 11
Breakpoint 2: where = test.exe`main + 40 at test.c:11, address =
0x0000000100000fa0
(lldb) r
Process 3620 launched: '/Applications/test/test.exe' (x86_64)
Process 3620 stopped
* thread #1: tid = 0xed87, 0x0000000100000f97 test.exe`main + 31 at test.c:7,
queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
frame #0: 0x0000000100000f97 test.exe`main + 31 at test.c:7
4 if (c != 1) {
5 typedef int a;
6 a b;
-> 7 b = 0;
8 } else {
9 typedef float a;
10 a b;
(lldb) type lookup a
Best match found in /Applications/test/test.exe:
id = {0x100000106}, name = "a", byte-size = 4, decl = test.c:5, clang_type =
"typedef a"
typedef 'a': id = {0x1000000b6}, name = "int", byte-size = 4, clang_type =
"int"
(lldb) c
Process 3620 resuming
Process 3620 stopped
* thread #1: tid = 0xed87, 0x0000000100000fa0 test.exe`main + 40 at test.c:11,
queue = 'com.apple.main-thread', stop reason = breakpoint 2.1
frame #0: 0x0000000100000fa0 test.exe`main + 40 at test.c:11
8 } else {
9 typedef float a;
10 a b;
-> 11 b = 0;
12 }
13 c++;
14 }
(lldb) type lookup a
Best match found in /Applications/test/test.exe:
id = {0x100000106}, name = "a", byte-size = 4, decl = test.c:5, clang_type =
"typedef a"
typedef 'a': id = {0x1000000b6}, name = "int", byte-size = 4, clang_type =
"int"
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