# lesson 42 capture
# command: lldb -b -o settings set interpreter.stop-command-source-on-error false -s session-O0.lldb ./account-O0
# cwd: fixtures
# lldb: lldb-1703.0.236.21
# date: 2026-10-14
(lldb) target create "./account-O0"
Current executable set to '/private/tmp/aiefs-re/phases/13-tools-and-protocols/42-dynamic-analysis-of-your-own-program/code/fixtures/account-O0' (arm64).
(lldb) settings set interpreter.stop-command-source-on-error false
(lldb) command source -s 0 'session-O0.lldb'
Executing commands in '/private/tmp/aiefs-re/phases/13-tools-and-protocols/42-dynamic-analysis-of-your-own-program/code/fixtures/session-O0.lldb'.
(lldb) breakpoint set -n bump
Breakpoint 1: where = account-O0`bump + 12 at account.c:13:19, address = 0x00000001000004bc
(lldb) breakpoint set -n classify
Breakpoint 2: where = account-O0`classify + 8 at account.c:18:9, address = 0x00000001000004e8
(lldb) breakpoint set -n sum_balances
Breakpoint 3: where = account-O0`sum_balances + 12 at account.c:24:9, address = 0x0000000100000544
(lldb) breakpoint set -a 0x100000504 -s account-O0
Breakpoint 4: where = account-O0`classify + 36 at account.c:19:9, address = 0x0000000100000504
(lldb) breakpoint set -a 0x1000004f4 -s account-O0
Breakpoint 5: where = account-O0`classify + 20 at account.c:18:9, address = 0x00000001000004f4
(lldb) breakpoint set -a 0x100000524 -s account-O0
Breakpoint 6: where = account-O0`classify + 68 at account.c:20:5, address = 0x0000000100000524
(lldb) breakpoint set -a 0x100000514 -s account-O0
Breakpoint 7: where = account-O0`classify + 52 at account.c:19:9, address = 0x0000000100000514
(lldb) target stop-hook add -o "register read x0 x1 pc" -o "memory read -s4 -fx -c24 $x0" -o "frame variable -P 1"
Stop hook #1 added.
(lldb) run
      x0 = 0x0000000000000000
      x1 = 0x0000000000000000
      pc = 0x00000001000109c0  dyld`_dyld_start
sizeof 32 align 8
offsets 0 4 8 16 24
      x0 = 0x000000016fdfe008
      x1 = 0x0000000000000005
      pc = 0x00000001000004bc  account-O0`bump + 12 at account.c:13:19
0x16fdfe008: 0x00000073 0x000000fa 0x00000009 0x00000000
0x16fdfe018: 0x00000000 0x3ff40000 0x00000719 0x00000001
0x16fdfe028: 0x0000006c 0xffffffd8 0x00000003 0x00000000
0x16fdfe038: 0x00000000 0x40000000 0x00000721 0x00000001
0x16fdfe048: 0xdd180039 0x6c94556a 0x6fdfe6b0 0x00000001
0x16fdfe058: 0x9a949d54 0x00000001 0x00000000 0x00000000
(account *) a = 0x000000016fdfe008 {
  kind = 's'
  balance = 250
  code = 9
  rate = 1.25
  label = 0x0000000100000719 "savings"
}
(int) by = 5
Process 26041 launched: '/private/tmp/aiefs-re/phases/13-tools-and-protocols/42-dynamic-analysis-of-your-own-program/code/fixtures/account-O0' (arm64)
Process 26041 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x00000001000004bc account-O0`bump(a=0x000000016fdfe008, by=5) at account.c:13:19
   10  	};
   11  	
   12  	int bump(struct account *a, int by) {
-> 13  	    a->balance += by;
    	                  ^
   14  	    return a->balance;
   15  	}
   16  	
Target 0: (account-O0) stopped.
(lldb) watchpoint set variable a->balance
Watchpoint created: Watchpoint 1: addr = 0x16fdfe00c size = 4 state = enabled type = m
    declare @ '/private/tmp/aiefs-re/phases/13-tools-and-protocols/42-dynamic-analysis-of-your-own-program/code/fixtures/account.c:12'
    watchpoint spec = 'a->balance'
    watchpoint resources:
       #0: addr = 0x16fdfe00c size = 4
Watchpoint 1 hit:
    
new value: 250
(lldb) watchpoint list
Number of supported hardware watchpoints: 4
Current watchpoints:
Watchpoint 1: addr = 0x16fdfe00c size = 4 state = enabled type = m
    declare @ '/private/tmp/aiefs-re/phases/13-tools-and-protocols/42-dynamic-analysis-of-your-own-program/code/fixtures/account.c:12'
    watchpoint spec = 'a->balance'
    watchpoint resources:
       #0: addr = 0x16fdfe00c size = 4
Watchpoint 1 hit:
    
new value: 250
(lldb) continue

Watchpoint 1 hit:
old value: 250
new value: 255
      x0 = 0x000000016fdfe008
      x1 = 0x0000000000000005
      pc = 0x00000001000004d0  account-O0`bump + 32 at account.c:14:12
0x16fdfe008: 0x00000073 0x000000ff 0x00000009 0x00000000
0x16fdfe018: 0x00000000 0x3ff40000 0x00000719 0x00000001
0x16fdfe028: 0x0000006c 0xffffffd8 0x00000003 0x00000000
0x16fdfe038: 0x00000000 0x40000000 0x00000721 0x00000001
0x16fdfe048: 0xdd180039 0x6c94556a 0x6fdfe6b0 0x00000001
0x16fdfe058: 0x9a949d54 0x00000001 0x00000000 0x00000000
(account *) a = 0x000000016fdfe008 {
  kind = 's'
  balance = 255
  code = 9
  rate = 1.25
  label = 0x0000000100000719 "savings"
}
(int) by = 5
Process 26041 resuming
Process 26041 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = watchpoint 1
    frame #0: 0x00000001000004d0 account-O0`bump(a=0x000000016fdfe008, by=5) at account.c:14:12
   11  	
   12  	int bump(struct account *a, int by) {
   13  	    a->balance += by;
-> 14  	    return a->balance;
    	           ^
   15  	}
   16  	
   17  	int classify(const struct account *a) {
Target 0: (account-O0) stopped.
(lldb) continue
      x0 = 0x000000016fdfdfe8
      x1 = 0x0000000000000005
      pc = 0x00000001000004e8  account-O0`classify + 8 at account.c:18:9
0x16fdfdfe8: 0x00000063 0x00000064 0x00000007 0x00000000
0x16fdfdff8: 0x00000000 0x3fe00000 0x00000714 0x00000001
0x16fdfe008: 0x00000073 0x000000ff 0x00000009 0x00000000
0x16fdfe018: 0x00000000 0x3ff40000 0x00000719 0x00000001
0x16fdfe028: 0x0000006c 0xffffffd8 0x00000003 0x00000000
0x16fdfe038: 0x00000000 0x40000000 0x00000721 0x00000001
(const account *) a = 0x000000016fdfdfe8 {
  kind = 'c'
  balance = 100
  code = 7
  rate = 0.5
  label = 0x0000000100000714 "cash"
}
Process 26041 resuming
Process 26041 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 2.1
    frame #0: 0x00000001000004e8 account-O0`classify(a=0x000000016fdfdfe8) at account.c:18:9
   15  	}
   16  	
   17  	int classify(const struct account *a) {
-> 18  	    if (a->balance < 0) return -1;
    	        ^
   19  	    if (a->balance > 200) return 1;
   20  	    return 0;
   21  	}
Target 0: (account-O0) stopped.
(lldb) continue
      x0 = 0x000000016fdfdfe8
      x1 = 0x0000000000000005
      pc = 0x0000000100000504  account-O0`classify + 36 at account.c:19:9
0x16fdfdfe8: 0x00000063 0x00000064 0x00000007 0x00000000
0x16fdfdff8: 0x00000000 0x3fe00000 0x00000714 0x00000001
0x16fdfe008: 0x00000073 0x000000ff 0x00000009 0x00000000
0x16fdfe018: 0x00000000 0x3ff40000 0x00000719 0x00000001
0x16fdfe028: 0x0000006c 0xffffffd8 0x00000003 0x00000000
0x16fdfe038: 0x00000000 0x40000000 0x00000721 0x00000001
(const account *) a = 0x000000016fdfdfe8 {
  kind = 'c'
  balance = 100
  code = 7
  rate = 0.5
  label = 0x0000000100000714 "cash"
}
Process 26041 resuming
Process 26041 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 4.1
    frame #0: 0x0000000100000504 account-O0`classify(a=0x000000016fdfdfe8) at account.c:19:9
   16  	
   17  	int classify(const struct account *a) {
   18  	    if (a->balance < 0) return -1;
-> 19  	    if (a->balance > 200) return 1;
    	        ^
   20  	    return 0;
   21  	}
   22  	
Target 0: (account-O0) stopped.
(lldb) continue
      x0 = 0x000000016fdfdfe8
      x1 = 0x0000000000000005
      pc = 0x0000000100000524  account-O0`classify + 68 at account.c:20:5
0x16fdfdfe8: 0x00000063 0x00000064 0x00000007 0x00000000
0x16fdfdff8: 0x00000000 0x3fe00000 0x00000714 0x00000001
0x16fdfe008: 0x00000073 0x000000ff 0x00000009 0x00000000
0x16fdfe018: 0x00000000 0x3ff40000 0x00000719 0x00000001
0x16fdfe028: 0x0000006c 0xffffffd8 0x00000003 0x00000000
0x16fdfe038: 0x00000000 0x40000000 0x00000721 0x00000001
(const account *) a = 0x000000016fdfdfe8 {
  kind = 'c'
  balance = 100
  code = 7
  rate = 0.5
  label = 0x0000000100000714 "cash"
}
Process 26041 resuming
Process 26041 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 6.1
    frame #0: 0x0000000100000524 account-O0`classify(a=0x000000016fdfdfe8) at account.c:20:5
   17  	int classify(const struct account *a) {
   18  	    if (a->balance < 0) return -1;
   19  	    if (a->balance > 200) return 1;
-> 20  	    return 0;
    	    ^
   21  	}
   22  	
   23  	int sum_balances(const struct account *list, int count) {
Target 0: (account-O0) stopped.
(lldb) continue
      x0 = 0x000000016fdfe008
      x1 = 0x0000000000000005
      pc = 0x00000001000004e8  account-O0`classify + 8 at account.c:18:9
0x16fdfe008: 0x00000073 0x000000ff 0x00000009 0x00000000
0x16fdfe018: 0x00000000 0x3ff40000 0x00000719 0x00000001
0x16fdfe028: 0x0000006c 0xffffffd8 0x00000003 0x00000000
0x16fdfe038: 0x00000000 0x40000000 0x00000721 0x00000001
0x16fdfe048: 0xdd180039 0x6c94556a 0x6fdfe6b0 0x00000001
0x16fdfe058: 0x9a949d54 0x00000001 0x00000000 0x00000000
(const account *) a = 0x000000016fdfe008 {
  kind = 's'
  balance = 255
  code = 9
  rate = 1.25
  label = 0x0000000100000719 "savings"
}
Process 26041 resuming
Process 26041 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 2.1
    frame #0: 0x00000001000004e8 account-O0`classify(a=0x000000016fdfe008) at account.c:18:9
   15  	}
   16  	
   17  	int classify(const struct account *a) {
-> 18  	    if (a->balance < 0) return -1;
    	        ^
   19  	    if (a->balance > 200) return 1;
   20  	    return 0;
   21  	}
Target 0: (account-O0) stopped.
(lldb) continue
      x0 = 0x000000016fdfe008
      x1 = 0x0000000000000005
      pc = 0x0000000100000504  account-O0`classify + 36 at account.c:19:9
0x16fdfe008: 0x00000073 0x000000ff 0x00000009 0x00000000
0x16fdfe018: 0x00000000 0x3ff40000 0x00000719 0x00000001
0x16fdfe028: 0x0000006c 0xffffffd8 0x00000003 0x00000000
0x16fdfe038: 0x00000000 0x40000000 0x00000721 0x00000001
0x16fdfe048: 0xdd180039 0x6c94556a 0x6fdfe6b0 0x00000001
0x16fdfe058: 0x9a949d54 0x00000001 0x00000000 0x00000000
(const account *) a = 0x000000016fdfe008 {
  kind = 's'
  balance = 255
  code = 9
  rate = 1.25
  label = 0x0000000100000719 "savings"
}
Process 26041 resuming
Process 26041 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 4.1
    frame #0: 0x0000000100000504 account-O0`classify(a=0x000000016fdfe008) at account.c:19:9
   16  	
   17  	int classify(const struct account *a) {
   18  	    if (a->balance < 0) return -1;
-> 19  	    if (a->balance > 200) return 1;
    	        ^
   20  	    return 0;
   21  	}
   22  	
Target 0: (account-O0) stopped.
(lldb) continue
      x0 = 0x000000016fdfe008
      x1 = 0x0000000000000005
      pc = 0x0000000100000514  account-O0`classify + 52 at account.c:19:9
0x16fdfe008: 0x00000073 0x000000ff 0x00000009 0x00000000
0x16fdfe018: 0x00000000 0x3ff40000 0x00000719 0x00000001
0x16fdfe028: 0x0000006c 0xffffffd8 0x00000003 0x00000000
0x16fdfe038: 0x00000000 0x40000000 0x00000721 0x00000001
0x16fdfe048: 0xdd180039 0x6c94556a 0x6fdfe6b0 0x00000001
0x16fdfe058: 0x9a949d54 0x00000001 0x00000000 0x00000000
(const account *) a = 0x000000016fdfe008 {
  kind = 's'
  balance = 255
  code = 9
  rate = 1.25
  label = 0x0000000100000719 "savings"
}
Process 26041 resuming
Process 26041 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 7.1
    frame #0: 0x0000000100000514 account-O0`classify(a=0x000000016fdfe008) at account.c:19:9
   16  	
   17  	int classify(const struct account *a) {
   18  	    if (a->balance < 0) return -1;
-> 19  	    if (a->balance > 200) return 1;
    	        ^
   20  	    return 0;
   21  	}
   22  	
Target 0: (account-O0) stopped.
(lldb) continue
      x0 = 0x000000016fdfe028
      x1 = 0x0000000000000005
      pc = 0x00000001000004e8  account-O0`classify + 8 at account.c:18:9
0x16fdfe028: 0x0000006c 0xffffffd8 0x00000003 0x00000000
0x16fdfe038: 0x00000000 0x40000000 0x00000721 0x00000001
0x16fdfe048: 0xdd180039 0x6c94556a 0x6fdfe6b0 0x00000001
0x16fdfe058: 0x9a949d54 0x00000001 0x00000000 0x00000000
0x16fdfe068: 0x00000001 0x00000000 0x00000000 0x00000000
0x16fdfe078: 0x9a941000 0x00000001 0x6fdfe6c0 0x00000001
(const account *) a = 0x000000016fdfe028 {
  kind = 'l'
  balance = -40
  code = 3
  rate = 2
  label = 0x0000000100000721 "loan"
}
Process 26041 resuming
Process 26041 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 2.1
    frame #0: 0x00000001000004e8 account-O0`classify(a=0x000000016fdfe028) at account.c:18:9
   15  	}
   16  	
   17  	int classify(const struct account *a) {
-> 18  	    if (a->balance < 0) return -1;
    	        ^
   19  	    if (a->balance > 200) return 1;
   20  	    return 0;
   21  	}
Target 0: (account-O0) stopped.
(lldb) continue
      x0 = 0x000000016fdfe028
      x1 = 0x0000000000000005
      pc = 0x00000001000004f4  account-O0`classify + 20 at account.c:18:9
0x16fdfe028: 0x0000006c 0xffffffd8 0x00000003 0x00000000
0x16fdfe038: 0x00000000 0x40000000 0x00000721 0x00000001
0x16fdfe048: 0xdd180039 0x6c94556a 0x6fdfe6b0 0x00000001
0x16fdfe058: 0x9a949d54 0x00000001 0x00000000 0x00000000
0x16fdfe068: 0x00000001 0x00000000 0x00000000 0x00000000
0x16fdfe078: 0x9a941000 0x00000001 0x6fdfe6c0 0x00000001
(const account *) a = 0x000000016fdfe028 {
  kind = 'l'
  balance = -40
  code = 3
  rate = 2
  label = 0x0000000100000721 "loan"
}
Process 26041 resuming
Process 26041 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 5.1
    frame #0: 0x00000001000004f4 account-O0`classify(a=0x000000016fdfe028) at account.c:18:9
   15  	}
   16  	
   17  	int classify(const struct account *a) {
-> 18  	    if (a->balance < 0) return -1;
    	        ^
   19  	    if (a->balance > 200) return 1;
   20  	    return 0;
   21  	}
Target 0: (account-O0) stopped.
(lldb) continue
class 0 1 -1
      x0 = 0x000000016fdfdfe8
      x1 = 0x0000000000000003
      pc = 0x0000000100000544  account-O0`sum_balances + 12 at account.c:24:9
0x16fdfdfe8: 0x00000063 0x00000064 0x00000007 0x00000000
0x16fdfdff8: 0x00000000 0x3fe00000 0x00000714 0x00000001
0x16fdfe008: 0x00000073 0x000000ff 0x00000009 0x00000000
0x16fdfe018: 0x00000000 0x3ff40000 0x00000719 0x00000001
0x16fdfe028: 0x0000006c 0xffffffd8 0x00000003 0x00000000
0x16fdfe038: 0x00000000 0x40000000 0x00000721 0x00000001
(const account *) list = 0x000000016fdfdfe8 {
  kind = 'c'
  balance = 100
  code = 7
  rate = 0.5
  label = 0x0000000100000714 "cash"
}
(int) count = 3
(int) sum = 1876942928
Process 26041 resuming
Process 26041 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 3.1
    frame #0: 0x0000000100000544 account-O0`sum_balances(list=0x000000016fdfdfe8, count=3) at account.c:24:9
   21  	}
   22  	
   23  	int sum_balances(const struct account *list, int count) {
-> 24  	    int sum = 0;
    	        ^
   25  	    for (int i = 0; i < count; i++) sum += list[i].balance;
   26  	    return sum;
   27  	}
Target 0: (account-O0) stopped.
(lldb) continue
sum 315
Process 26041 resuming
Process 26041 exited with status = 0 (0x00000000)
(lldb) continue
error: Process must be launched.
(lldb) continue
error: Process must be launched.
(lldb) continue
error: Process must be launched.
(lldb) continue
error: Process must be launched.
(lldb) continue
error: Process must be launched.
(lldb) breakpoint list
Current breakpoints:
1: name = 'bump', locations = 1, resolved = 1, hit count = 1
  1.1: where = account-O0`bump + 12 at account.c:13:19, address = 0x00000001000004bc, resolved, hit count = 1 

2: name = 'classify', locations = 1, resolved = 1, hit count = 3
  2.1: where = account-O0`classify + 8 at account.c:18:9, address = 0x00000001000004e8, resolved, hit count = 3 

3: name = 'sum_balances', locations = 1, resolved = 1, hit count = 1
  3.1: where = account-O0`sum_balances + 12 at account.c:24:9, address = 0x0000000100000544, resolved, hit count = 1 

4: address = account-O0[0x0000000100000504], locations = 1, resolved = 1, hit count = 2
  4.1: where = account-O0`classify + 36 at account.c:19:9, address = 0x0000000100000504, resolved, hit count = 2 

5: address = account-O0[0x00000001000004f4], locations = 1, resolved = 1, hit count = 1
  5.1: where = account-O0`classify + 20 at account.c:18:9, address = 0x00000001000004f4, resolved, hit count = 1 

6: address = account-O0[0x0000000100000524], locations = 1, resolved = 1, hit count = 1
  6.1: where = account-O0`classify + 68 at account.c:20:5, address = 0x0000000100000524, resolved, hit count = 1 

7: address = account-O0[0x0000000100000514], locations = 1, resolved = 1, hit count = 1
  7.1: where = account-O0`classify + 52 at account.c:19:9, address = 0x0000000100000514, resolved, hit count = 1 

(lldb) watchpoint list -v
Current watchpoints:
Watchpoint 1: addr = 0x16fdfe00c size = 4 state = enabled type = m
    declare @ '/private/tmp/aiefs-re/phases/13-tools-and-protocols/42-dynamic-analysis-of-your-own-program/code/fixtures/account.c:12'
    watchpoint spec = 'a->balance'
    watchpoint resources:
       #0: addr = 0x16fdfe00c size = 4
Watchpoint 1 hit:
    old value: 250
new value: 255
    hit_count = 1     ignore_count = 0