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Move debugger_visualizer examples into example blocks
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‎src/attributes/debugger.md‎

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@@ -24,60 +24,61 @@ r[attributes.debugger.debugger_visualizer.natvis.msvc]
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This attribute only supports embedding Natvis files on `-windows-msvc` targets.
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r[attributes.debugger.debugger_visualizer.natvis.path]
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The path to the Natvis file is specified with the `natvis_file` key, which is a path relative to the crate source file:
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<!-- ignore: requires external files, and msvc -->
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```rust ignore
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#![debugger_visualizer(natvis_file = "Rectangle.natvis")]
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struct FancyRect {
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x: f32,
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y: f32,
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dx: f32,
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dy: f32,
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}
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fn main() {
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let fancy_rect = FancyRect { x: 10.0, y: 10.0, dx: 5.0, dy: 5.0 };
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println!("set breakpoint here");
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}
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```
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and `Rectangle.natvis` contains:
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```xml
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<?xml version="1.0" encoding="utf-8"?>
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<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
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<Type Name="foo::FancyRect">
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<DisplayString>({x},{y}) + ({dx}, {dy})</DisplayString>
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<Expand>
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<Synthetic Name="LowerLeft">
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<DisplayString>({x}, {y})</DisplayString>
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</Synthetic>
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<Synthetic Name="UpperLeft">
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<DisplayString>({x}, {y + dy})</DisplayString>
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</Synthetic>
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<Synthetic Name="UpperRight">
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<DisplayString>({x + dx}, {y + dy})</DisplayString>
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</Synthetic>
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<Synthetic Name="LowerRight">
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<DisplayString>({x + dx}, {y})</DisplayString>
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</Synthetic>
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</Expand>
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</Type>
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</AutoVisualizer>
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```
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When viewed under WinDbg, the `fancy_rect` variable would be shown as follows:
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The path to the Natvis file is specified with the `natvis_file` key, which is a path relative to the crate source file.
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```text
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> Variables:
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> fancy_rect: (10.0, 10.0) + (5.0, 5.0)
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> LowerLeft: (10.0, 10.0)
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> UpperLeft: (10.0, 15.0)
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> UpperRight: (15.0, 15.0)
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> LowerRight: (15.0, 10.0)
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```
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> [!EXAMPLE]
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> <!-- ignore: requires external files, and msvc -->
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> ```rust ignore
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> #![debugger_visualizer(natvis_file = "Rectangle.natvis")]
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>
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> struct FancyRect {
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> x: f32,
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> y: f32,
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> dx: f32,
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> dy: f32,
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> }
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>
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> fn main() {
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> let fancy_rect = FancyRect { x: 10.0, y: 10.0, dx: 5.0, dy: 5.0 };
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> println!("set breakpoint here");
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> }
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> ```
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>
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> and `Rectangle.natvis` contains:
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>
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> ```xml
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> <?xml version="1.0" encoding="utf-8"?>
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> <AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
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> <Type Name="foo::FancyRect">
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> <DisplayString>({x},{y}) + ({dx}, {dy})</DisplayString>
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> <Expand>
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> <Synthetic Name="LowerLeft">
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> <DisplayString>({x}, {y})</DisplayString>
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> </Synthetic>
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> <Synthetic Name="UpperLeft">
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> <DisplayString>({x}, {y + dy})</DisplayString>
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> </Synthetic>
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> <Synthetic Name="UpperRight">
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> <DisplayString>({x + dx}, {y + dy})</DisplayString>
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> </Synthetic>
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> <Synthetic Name="LowerRight">
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> <DisplayString>({x + dx}, {y})</DisplayString>
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> </Synthetic>
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> </Expand>
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> </Type>
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> </AutoVisualizer>
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> ```
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>
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> When viewed under WinDbg, the `fancy_rect` variable would be shown as follows:
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>
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> ```text
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> > Variables:
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> > fancy_rect: (10.0, 10.0) + (5.0, 5.0)
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> > LowerLeft: (10.0, 10.0)
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> > UpperLeft: (10.0, 15.0)
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> > UpperRight: (15.0, 15.0)
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> > LowerRight: (15.0, 10.0)
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> ```
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r[attributes.debugger.debugger_visualizer.gdb]
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### Using `debugger_visualizer` with GDB
@@ -95,56 +96,57 @@ There are two ways to enable auto-loading embedded pretty printers:
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r[attributes.debugger.debugger_visualizer.gdb.path]
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These scripts are embedded using the `gdb_script_file` key, which is a path relative to the crate source file.
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<!-- ignore: requires external files -->
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```rust ignore
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#![debugger_visualizer(gdb_script_file = "printer.py")]
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struct Person {
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name: String,
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age: i32,
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}
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fn main() {
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let bob = Person { name: String::from("Bob"), age: 10 };
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println!("set breakpoint here");
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}
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```
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and `printer.py` contains:
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```python
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import gdb
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class PersonPrinter:
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"Print a Person"
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def __init__(self, val):
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self.val = val
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self.name = val["name"]
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self.age = int(val["age"])
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def to_string(self):
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return "{} is {} years old.".format(self.name, self.age)
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def lookup(val):
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lookup_tag = val.type.tag
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if lookup_tag is None:
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return None
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if "foo::Person" == lookup_tag:
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return PersonPrinter(val)
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return None
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gdb.current_objfile().pretty_printers.append(lookup)
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```
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When the crate's debug executable is passed into GDB[^rust-gdb], `print bob` will display:
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```text
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"Bob" is 10 years old.
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```
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[^rust-gdb]: Note: This assumes you are using the `rust-gdb` script which configures pretty-printers for standard library types like `String`.
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> [!EXAMPLE]
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> <!-- ignore: requires external files -->
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> ```rust ignore
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> #![debugger_visualizer(gdb_script_file = "printer.py")]
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>
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> struct Person {
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> name: String,
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> age: i32,
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> }
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>
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> fn main() {
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> let bob = Person { name: String::from("Bob"), age: 10 };
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> println!("set breakpoint here");
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> }
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> ```
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>
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> and `printer.py` contains:
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>
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> ```python
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> import gdb
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>
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> class PersonPrinter:
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> "Print a Person"
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>
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> def __init__(self, val):
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> self.val = val
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> self.name = val["name"]
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> self.age = int(val["age"])
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>
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> def to_string(self):
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> return "{} is {} years old.".format(self.name, self.age)
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>
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> def lookup(val):
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> lookup_tag = val.type.tag
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> if lookup_tag is None:
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> return None
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> if "foo::Person" == lookup_tag:
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> return PersonPrinter(val)
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>
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> return None
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>
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> gdb.current_objfile().pretty_printers.append(lookup)
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> ```
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>
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> When the crate's debug executable is passed into GDB[^rust-gdb], `print bob` will display:
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>
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> ```text
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> "Bob" is 10 years old.
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> ```
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>
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> [^rust-gdb]: Note: This assumes you are using the `rust-gdb` script which configures pretty-printers for standard library types like `String`.
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[auto-loading documentation]: https://sourceware.org/gdb/onlinedocs/gdb/Auto_002dloading-safe-path.html
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[attributes]: ../attributes.md

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