ldc hangs up in release mode

April 28, 2015
Re: ldc hangs up in release mode
Posted by drug
in reply to Kai Nacke
Permalink
drug
Posted in reply to Kai Nacke
Permalink
On 27.04.2015 23:00, Kai Nacke wrote:
> On Monday, 27 April 2015 at 12:13:26 UTC, drug wrote:
>> What the best way to solve the problem and find out the reason of it?
>
> Hi drug!
>
> I can think of 2 ways:
> - use option -vv to find out if there is a loop in codegen
> - fire up a debugger and break until ldc run some times to see where it
> loops
>
> Could you provide an example?
>
> Regards,
> Kai
I use gdb
```
Attaching to process 13474
Reading symbols from /usr/local/bin/ldc2...done.
Reading symbols from /usr/lib/x86_64-linux-gnu/libconfig.so.9...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/x86_64-linux-gnu/libconfig.so.9
Reading symbols from /lib/x86_64-linux-gnu/libpthread.so.0...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libpthread-2.19.so...done.
done.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Loaded symbols for /lib/x86_64-linux-gnu/libpthread.so.0
Reading symbols from /lib/x86_64-linux-gnu/libdl.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libdl-2.19.so...done.
done.
Loaded symbols for /lib/x86_64-linux-gnu/libdl.so.2
Reading symbols from /lib/x86_64-linux-gnu/libtinfo.so.5...(no debugging symbols found)...done.
Loaded symbols for /lib/x86_64-linux-gnu/libtinfo.so.5
Reading symbols from /lib/x86_64-linux-gnu/libz.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/x86_64-linux-gnu/libz.so.1
Reading symbols from /usr/lib/x86_64-linux-gnu/libffi.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/x86_64-linux-gnu/libffi.so.6
Reading symbols from /usr/lib/x86_64-linux-gnu/libedit.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/x86_64-linux-gnu/libedit.so.2
Reading symbols from /usr/lib/x86_64-linux-gnu/libstdc++.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/x86_64-linux-gnu/libstdc++.so.6
Reading symbols from /lib/x86_64-linux-gnu/libm.so.6...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libm-2.19.so...done.
done.
Loaded symbols for /lib/x86_64-linux-gnu/libm.so.6
Reading symbols from /lib/x86_64-linux-gnu/libgcc_s.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/x86_64-linux-gnu/libgcc_s.so.1
Reading symbols from /lib/x86_64-linux-gnu/libc.so.6...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libc-2.19.so...done.
done.
Loaded symbols for /lib/x86_64-linux-gnu/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/ld-2.19.so...done.
done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /lib/x86_64-linux-gnu/libbsd.so.0...(no debugging symbols found)...done.
Loaded symbols for /lib/x86_64-linux-gnu/libbsd.so.0
0x000000000120bb05 in (anonymous namespace)::SCCPSolver::getStructValueState(llvm::Value*, unsigned int) ()
(gdb) c
Continuing.
^C
Program received signal SIGINT, Interrupt.
0x000000000120bb05 in (anonymous namespace)::SCCPSolver::getStructValueState(llvm::Value*, unsigned int) ()
(gdb) bt
#0  0x000000000120bb05 in (anonymous namespace)::SCCPSolver::getStructValueState(llvm::Value*, unsigned int) ()
#1  0x000000000120fd76 in llvm::InstVisitor<(anonymous namespace)::SCCPSolver, void>::visit(llvm::Instruction&) ()
#2  0x0000000001211ac7 in (anonymous namespace)::SCCPSolver::Solve() ()
#3  0x0000000001212af3 in (anonymous namespace)::IPSCCP::runOnModule(llvm::Module&) ()
#4  0x0000000001591f29 in llvm::legacy::PassManagerImpl::run(llvm::Module&) ()
#5  0x000000000078e5bf in ldc_optimize_module (M=M@entry=0x6037abf0) at /home/drug/3rdparties/ldc/ldc/gen/optimizer.cpp:441
#6  0x000000000064a951 in writeModule (m=0x6037abf0,

filename="service/.dub/build/normal-release-linux.posix-x86_64-ldmd2-91C4918C31AD443BF98F006B48FAF7C6/service.o")
    at /home/drug/3rdparties/ldc/ldc/driver/toobj.cpp:140
#7  0x0000000000619a4a in main (argc=<optimized out>, argv=<optimized out>) at /home/drug/3rdparties/ldc/ldc/driver/main.cpp:1411
(gdb) c
Continuing.
^C
Program received signal SIGINT, Interrupt.
0x000000000120bb05 in (anonymous namespace)::SCCPSolver::getStructValueState(llvm::Value*, unsigned int) ()
(gdb) bt
#0  0x000000000120bb05 in (anonymous namespace)::SCCPSolver::getStructValueState(llvm::Value*, unsigned int) ()
#1  0x000000000120fd76 in llvm::InstVisitor<(anonymous namespace)::SCCPSolver, void>::visit(llvm::Instruction&) ()
#2  0x0000000001211ac7 in (anonymous namespace)::SCCPSolver::Solve() ()
#3  0x0000000001212af3 in (anonymous namespace)::IPSCCP::runOnModule(llvm::Module&) ()
#4  0x0000000001591f29 in llvm::legacy::PassManagerImpl::run(llvm::Module&) ()
#5  0x000000000078e5bf in ldc_optimize_module (M=M@entry=0x6037abf0) at /home/drug/3rdparties/ldc/ldc/gen/optimizer.cpp:441
#6  0x000000000064a951 in writeModule (m=0x6037abf0,

filename="service/.dub/build/normal-release-linux.posix-x86_64-ldmd2-91C4918C31AD443BF98F006B48FAF7C6/service.o")
    at /home/drug/3rdparties/ldc/ldc/driver/toobj.cpp:140
#7  0x0000000000619a4a in main (argc=<optimized out>, argv=<optimized out>) at /home/drug/3rdparties/ldc/ldc/driver/main.cpp:1411
(gdb)
```
I several times breaks execution and every time ldc is in ::SCCPSolver::getStructValueState() function. Hope it's useful
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