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hashmap - 如何在 GDB 中漂亮地打印 Rust HashMap？

问题描述

这是一个简单的 Rust 示例，其中包含我在 GDB 中运行的Vec和：HashMap

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);
}

当我查看Vec它时，它打印得很漂亮，而HashMap不是：

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)

该程序可以看到HashMap（并打印出它的值），但我在 GDB 中看不到那些。Rust 漂亮的打印机似乎已启用，因为Vec它打印得很好。

如何获取HashMap常规 GDB 中的键和值？

标签： hashmaprustgdb

解决方案

目前无法为HashMap.

有一个未解决的问题需要此功能。

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