Background - I'm working on getting LLDB to run on Hexagon Linux, built with
an LLVM toolchain. We're using libc++ and MUSL. The loader is a bit
squirrelly right now, so I've built LLDB statically.
I've got full source debugging in the driver, but when I step into
SBDebugger::Create, I don't have any source. I've got symbols:
(lldb) bt
* thread #1: tid = 1, 0x00114730 lldb`lldb::SBDebugger::Create(bool) + 16,
stop reason = breakpoint 2.1
* frame #0: 0x00114730 lldb`lldb::SBDebugger::Create(bool) + 16
frame #1: 0x000001dc lldb`Driver::Driver(this=0x7ffefc50) + 124 at
Driver.cpp:150
frame #2: 0x00006aa0 lldb`main(argc=1, argv=0x7ffefd34) + 240 at
Driver.cpp:1350
frame #3: 0x04744384 lldb`__libc_start_main + 48
list SBDebugger::Create fails, but list SBDebugger::Create(bool) gives me
source.
(lldb) list SBDebugger::Create
(lldb) list SBDebugger::Create(bool)
File:
\local\mnt\workspace\ted\linux\llvm\tools\lldb\source\API\SBDebugger.cpp
172 return SBDebugger::Create(false, nullptr, nullptr);
173 }
174
175 SBDebugger
176 SBDebugger::Create(bool source_init_files)
177 {
178 return SBDebugger::Create (source_init_files, nullptr, nullptr);
179 }
180
181 SBDebugger
182 SBDebugger::Create(bool source_init_files, lldb::LogOutputCallback
callback, void *baton)
183
Finally, I try to list based on the address of the function:
(lldb) list 0x114720
error: address resolves to lldb[0x0000000000114720], but there is no line
table information available for this address.
But there is line table information for 0x114720 (from llvm-dwarfdump):
0x0000000000114720 177 0 80 0 0 is_stmt
0x0000000000114730 178 32 80 0 0 is_stmt
prologue_end
0x0000000000114734 178 12 80 0 0
0x0000000000114754 178 5 80 0 0
My breakpoint at SBDebugger::Create resolved to prologue_end:
(lldb) break list
Current breakpoints:
1: name = 'main', locations = 1, resolved = 1, hit count = 1
1.1: where = lldb`main + 32 at Driver.cpp:1335, address = 0x000069d0,
resolved, hit count = 1
2: name = 'SBDebugger::Create', locations = 3, resolved = 3, hit count = 1
2.1: where = lldb`lldb::SBDebugger::Create(bool) + 16, address =
0x00114730, resolved, hit count = 1
2.2: where = lldb`lldb::SBDebugger::Create() + 8, address = 0x001143c0,
resolved, hit count = 0
2.3: where = lldb`lldb::SBDebugger::Create(bool, void (*)(char const*,
void*), void*) + 40, address = 0x00114404, resolved, hit count = 0
So - why can LLDB find the source when I specify the function explicitly, or
find the line table info when I set a breakpoint, but not when I am in the
function or list an address?
Ted
--
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
Linux Foundation Collaborative Project
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