Hi, all:

Thanks to Markus, BALATON, and Philippe for their reviews

In PATCH v4, 
I have extensively incorporated everyone's suggestions and made the
following improvements:

1. When printing the child nodes of a single node, the line characters from the
parent node's level are no longer printed, making the output more concise
and clear overall;

2. Use more commonly used ASCII characters, such as '|--' instead of '├──',
and '`--' instead of '└──';

3. Control the number of prefix characters to reduce unnecessary output;

The result is as follows:

```
$ ./qemu-system-aarch64 -S -monitor stdio -M raspi4b
(qemu) info mtree
address-space: memory
`-- 0000000000000000-ffffffffffffffff (prio 0, i/o): system
    |-- 0000000000000000-000000007fffffff (prio 0, ram): ram
...
    |-- 00000000fe000000-00000000ff7fffff (prio 1, i/o): bcm2835-peripherals
    |   |-- 00000000fe900000-00000000fe907fff (prio -1000, i/o): bcm2835-dbus
    |   |-- 00000000fe910000-00000000fe917fff (prio -1000, i/o): bcm2835-ave0
    |   |-- 00000000fe980000-00000000fe990fff (prio 0, i/o): dwc2
    |   |   |-- 00000000fe980000-00000000fe980fff (prio 0, i/o): dwc2-io
    |   |   `-- 00000000fe981000-00000000fe990fff (prio 0, i/o): dwc2-fifo
    |   |-- 00000000fec00000-00000000fec00fff (prio -1000, i/o): bcm2835-v3d
    |   |-- 00000000fec11000-00000000fec110ff (prio -1000, i/o): bcm2835-clkisp
    |   |-- 00000000fee00000-00000000fee000ff (prio -1000, i/o): bcm2835-sdramc
    |   `-- 00000000fee05000-00000000fee050ff (prio 0, i/o): bcm2835-dma-chan15
    |-- 00000000ff800000-00000000ff8000ff (prio 0, i/o): bcm2836-control
...
    |-- 00000000ff845600-00000000ff8456ff (prio 0, i/o): gic_cpu
    `-- 00000000ff846000-00000000ff847fff (prio 0, i/o): gic_vcpu
```

PATCH v3 changelog:
1.Use more maintainable c functions instead of macros, as per review comments.

PATCH v2 changelog:
1. Enrich the commit message, add 'info mtree' print example.
2. Optimize the code implementation according to the review comments.

PATCH v3:
https://lore.kernel.org/qemu-devel/15227d0a-c459-4bea-bec7-13dc88d22c3c@linaro.org/

PATCH v2:
https://lore.kernel.org/qemu-devel/72b2d911-112e-48e3-9ba4-017a11758060@linaro.org/
https://lore.kernel.org/qemu-devel/7ec1e581-3919-fdf5-499a-279cba99d43d@eik.bme.hu/
https://lore.kernel.org/qemu-devel/874iy5d9v7.fsf@pond.sub.org/

PATCH v1:
https://lore.kernel.org/qemu-devel/210c69d9-803e-41a5-b40c-bc8372e582fa@redhat.com/

--
Regards,
Chao

Chao Liu (1):
  system: improve visual representation of node hierarchy in 'info
    mtree' output for qemu monitor

 system/memory.c | 122 +++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 111 insertions(+), 11 deletions(-)

-- 
2.48.1