Вот простой пример Rust с Vec и HashMap, который я запускаю в GDB:
use std::collections::HashMap;
fn main() {
let v = vec!["Mon", "Tue", "Wed"];
println!("{:?}", v);
let mut h = HashMap::new();
h.insert(1,"Jan");
h.insert(2,"Feb");
h.insert(3,"Mar");
h.insert(4,"Apr");
println!("{:?}", h);
}
Когда я просматриваю Vec, он довольно печатный, тогда как HashMap не:
bash$ rust-gdb target/debug/test_hashmap
GNU gdb (GDB) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from target/debug/test_hashmap...done.
(gdb) b 12
Breakpoint 1 at 0xa056: file src/main.rs, line 12.
(gdb) r
Starting program: /home/john/proj/test_hashmap/target/debug/test_hashmap
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
["Mon", "Tue", "Wed"]
Breakpoint 1, test_hashmap::main () at src/main.rs:12
12 println!("{:?}", h);
(gdb) p v
$1 = Vec<&str>(len: 3, cap: 3) = {"Mon", "Tue", "Wed"}
(gdb) p h
$2 = HashMap<i32, &str, std::collections::hash::map::RandomState> = {hash_builder = RandomState = {k0 = 12919411587537124140,
k1 = 836420561220520453}, table = RawTable<i32, &str> = {capacity_mask = 31, size = 4, hashes = TaggedHashUintPtr = {
Unique<usize> = {pointer = NonZero<*const usize> = {0x7ffff6c1c400}, _marker = PhantomData<usize>}},
marker = PhantomData<(i32, &str)>}, resize_policy = DefaultResizePolicy}
(gdb) info pretty-printer
global pretty-printers:
builtin
mpx_bound128
objfile /home/john/proj/test_hashmap/target/debug/test_hashmap pretty-printers:
rust_pretty_printer_lookup_function
(gdb) n
{1: "Jan", 4: "Apr", 3: "Mar", 2: "Feb"}
13 }
(gdb)
Программа видит HashMap (и печатает его значения в порядке), но я не вижу их внутри GDB. Кажется, что принтер Rust pretty включен, потому что Vec распечатывается просто отлично.
Как я могу получить HashMap ключи и значения в обычном GDB?