src/etc/natvis/libstd.natvis

   1 <?xml version="1.0" encoding="utf-8"?>
   2 <AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
   3   <!--
   4     std::collection::Hash* container visualizers
   5
   6     Current std impls:
   7       std::collections::hash::set::HashSet<K, S>      is implemented in terms of...
   8       hashbrown::set::HashSet<K, S>                   is implemented in terms of...
   9       hashbrown::map::HashMap<K, V, S>                is implemented in terms of...
  10       hashbrown::raw::RawTable<(K, V)>
  11
  12     Ideally, we'd teach rustc to scan dependencies/crates for .natvis files so
  13     the bulk of this could live alongside the hashbrown crate implementation,
  14     and std would just forward using e.g. <ExpandedItem>base</ExpandedItem>.
  15
  16     However, Given that std...Hash*Set* is currently implemented in terms of
  17     hashbrown...Hash*Map*, which would visualize poorly, we want to customize the
  18     look/feel at the std type level *anyways*...
  19
  20     References:
  21       https://github.com/rust-lang/rust/blob/master/src/libstd/collections/hash/map.rs
  22       https://github.com/rust-lang/rust/blob/master/src/libstd/collections/hash/set.rs
  23       https://github.com/rust-lang/hashbrown/blob/master/src/map.rs
  24       https://github.com/rust-lang/hashbrown/blob/master/src/set.rs
  25       https://github.com/rust-lang/hashbrown/blob/master/src/raw/mod.rs
  26   -->
  27
  28   <Type Name="std::collections::hash::map::HashMap&lt;*,*,*&gt;">
  29     <DisplayString>{{ len={base.table.table.items} }}</DisplayString>
  30     <Expand>
  31       <Item Name="[len]">base.table.table.items</Item>
  32       <Item Name="[capacity]">base.table.table.items + base.table.table.growth_left</Item>
  33       <Item Name="[state]">base.hash_builder</Item>
  34
  35       <CustomListItems>
  36         <Variable Name="i" InitialValue="0" />
  37         <Variable Name="n" InitialValue="base.table.table.items" />
  38         <Size>base.table.table.items</Size>
  39         <Loop>
  40           <Break Condition="n == 0" />
  41           <If Condition="(base.table.table.ctrl.pointer[i] &amp; 0x80) == 0">
  42             <!-- Bucket is populated -->
  43             <Exec>n--</Exec>
  44             <Item Name="{((tuple$&lt;$T1, $T2&gt;*)base.table.table.ctrl.pointer)[-(i + 1)].__0}">((tuple$&lt;$T1, $T2&gt;*)base.table.table.ctrl.pointer)[-(i + 1)].__1</Item>
  45           </If>
  46           <Exec>i++</Exec>
  47         </Loop>
  48       </CustomListItems>
  49     </Expand>
  50   </Type>
  51
  52   <Type Name="std::collections::hash::set::HashSet&lt;*,*&gt;">
  53     <DisplayString>{{ len={base.map.table.table.items} }}</DisplayString>
  54     <Expand>
  55       <Item Name="[len]">base.map.table.table.items</Item>
  56       <Item Name="[capacity]">base.map.table.table.items + base.map.table.table.growth_left</Item>
  57       <Item Name="[state]">base.map.hash_builder</Item>
  58
  59       <CustomListItems>
  60         <Variable Name="i" InitialValue="0" />
  61         <Variable Name="n" InitialValue="base.map.table.table.items" />
  62         <Size>base.map.table.table.items</Size>
  63         <Loop>
  64           <Break Condition="n == 0" />
  65           <If Condition="(base.map.table.table.ctrl.pointer[i] &amp; 0x80) == 0">
  66             <!-- Bucket is populated -->
  67             <Exec>n--</Exec>
  68             <Item>(($T1*)base.map.table.table.ctrl.pointer)[-(i + 1)]</Item>
  69           </If>
  70           <Exec>i++</Exec>
  71         </Loop>
  72       </CustomListItems>
  73     </Expand>
  74   </Type>
  75
  76   <Type Name="std::ffi::c_str::CString">
  77     <DisplayString>{inner.data_ptr,s}</DisplayString>
  78     <Expand>
  79       <Synthetic Name="[chars]">
  80         <Expand>
  81           <ArrayItems>
  82             <Size>inner.length</Size>
  83             <ValuePointer>(char*)inner.data_ptr</ValuePointer>
  84           </ArrayItems>
  85         </Expand>
  86       </Synthetic>
  87     </Expand>
  88   </Type>
  89
  90   <Type Name="std::ffi::c_str::CStr">
  91     <DisplayString>{(char*) inner}</DisplayString>
  92     <Expand>
  93       <Synthetic Name="[chars]">
  94         <DisplayString>{(char*) inner}</DisplayString>
  95         <Expand>
  96           <ArrayItems>
  97             <Size>strlen((char *) inner) + 1</Size>
  98             <ValuePointer>(char*)inner</ValuePointer>
  99           </ArrayItems>
 100         </Expand>
 101       </Synthetic>
 102     </Expand>
 103   </Type>
 104 </AutoVisualizer>