th (Trace to Next Branching Instruction)
The th command executes the program until it reaches any kind of branching instruction, including conditional or unconditional branches, calls, returns, and system calls.
User-Mode
[~Thread] th [r] [= StartAddress] [Count]
Kernel-Mode
th [r] [= StartAddress] [Count]
Parameters
Thread
Specifies threads to continue executing. All other threads are frozen. For more information about the syntax, see Thread Syntax. You can specify threads only in user mode.
r
Turns on and off the display of registers and flags. By default, the registers and flags are displayed. You can disable register display by using the thr, pr, tr, or .prompt_allow -reg commands. All of these commands control the same setting and you can use any of them to override any previous use of these commands.
You can also disable register display by using the l-os command. This setting is separate from the other four commands. To control which registers and flags are displayed, use the rm (Register Mask) command.
StartAddress
Specifies the address where the debugger begins execution. If you do not use StartAddress, execution begins at the instruction that the instruction pointer points to. For more information about the syntax, see Address and Address Range Syntax.
Count
Specifies the number of branching instructions that the debugger must encounter for the th command to end. The default value is one.
Environment
| Item | Description |
|---|---|
| Modes | user mode, kernel mode |
| Targets | live debugging only |
| Platforms | all |
Additional Information
For more information about related commands, see Controlling the Target.
Remarks
The th command causes the target to begin executing. Execution continues until the debugger reaches a branching instruction or encounters a breakpoint.
If the program counter is already on a branching instruction, the debugger traces into the branching instruction and continues executing until another branching instruction is reached. This tracing, rather than execution, of the call is the only difference between th and ph (Step to Next Branching Instruction).
th is available for all live sessions. This availability is the primary difference between th and tb (Trace to Next Branch).
In source mode, you can associate one source line with multiple assembly instructions. This command does not stop at a branching instruction that is associated with the current source line.