43 lines · cpp
1volatile int x;2 3void __attribute__((noinline)) sink() {4 x++; //% self.filecheck("bt", "main.cpp", "-implicit-check-not=artificial")5 // CHECK: frame #0: 0x{{[0-9a-f]+}} a.out`sink() at main.cpp:[[@LINE-1]]:46 // CHECK-NEXT: frame #1: 0x{{[0-9a-f]+}} a.out`func3() at main.cpp:26:37 // CHECK-SAME: [artificial]8 // CHECK-NEXT: frame #2: 0x{{[0-9a-f]+}} a.out`func2()9 // CHECK-NEXT: frame #3: 0x{{[0-9a-f]+}} a.out`func1() at main.cpp:35:310 // CHECK-SAME: [artificial]11 // CHECK-NEXT: frame #4: 0x{{[0-9a-f]+}} a.out`main12 // In the GNU style, the artificial frames will point after the tail call13 // instruction. In v5 they should point to the instruction itself.14 //% frame1 = self.thread().GetFrameAtIndex(1)15 //% func3 = frame1.GetFunction()16 //% func3_insns = func3.GetInstructions(self.target())17 //% self.trace("func3:\n%s"%func3_insns)18 //% last_insn = func3_insns.GetInstructionAtIndex(func3_insns.GetSize()-1)19 //% addr = last_insn.GetAddress()20 //% if "GNU" in self.name: addr.OffsetAddress(last_insn.GetByteSize())21 //% self.assertEqual(frame1.GetPCAddress(), addr)22}23 24void __attribute__((noinline)) func3() {25 x++;26 sink(); /* tail */27}28 29void __attribute__((disable_tail_calls, noinline)) func2() {30 func3(); /* regular */31}32 33void __attribute__((noinline)) func1() {34 x++;35 func2(); /* tail */36}37 38int __attribute__((disable_tail_calls)) main() {39 // DEBUG: self.runCmd("log enable lldb step -f /tmp/lldbstep.log")40 func1(); /* regular */41 return 0;42}43