Merge pull request #44 from de-vri-es/debug-and-defmt

Implement Debug and defmt::Format for fieldsets, enums and the interrupt enum.

src/generate/device.rs

@@ -17,7 +17,7 @@ pub fn render_device_x(_ir: &IR, d: &Device) -> Result<String> {
     Ok(device_x)
 }
 
-pub fn render(_opts: &super::Options, ir: &IR, d: &Device, path: &str) -> Result<TokenStream> {
+pub fn render(opts: &super::Options, ir: &IR, d: &Device, path: &str) -> Result<TokenStream> {
     let mut out = TokenStream::new();
     let span = Span::call_site();
 
@@ -77,8 +77,16 @@ pub fn render(_opts: &super::Options, ir: &IR, d: &Device, path: &str) -> Result
         }
     }
     let n = util::unsuffixed(pos as u64);
+
+    let defmt = opts.defmt_feature.as_ref().map(|defmt_feature| {
+        quote! {
+            #[cfg_attr(feature = #defmt_feature, derive(defmt::Format))]
+        }
+    });
+
     out.extend(quote!(
         #[derive(Copy, Clone, Debug, PartialEq, Eq)]
+        #defmt
         pub enum Interrupt {
             #interrupts
         }

src/generate/enumm.rs

@@ -10,7 +10,7 @@ use crate::util;
 
 use super::sorted;
 
-pub fn render(_opts: &super::Options, _ir: &IR, e: &Enum, path: &str) -> Result<TokenStream> {
+pub fn render(opts: &super::Options, _ir: &IR, e: &Enum, path: &str) -> Result<TokenStream> {
     let span = Span::call_site();
 
     // For very "sparse" enums, generate a newtype wrapping the uX.
@@ -33,17 +33,39 @@ pub fn render(_opts: &super::Options, _ir: &IR, e: &Enum, path: &str) -> Result<
 
     if newtype {
         let mut items = TokenStream::new();
+        let mut item_names_str = Vec::with_capacity(e.variants.len());
+        let mut item_values = Vec::with_capacity(e.variants.len());
 
         for f in sorted(&e.variants, |f| (f.value, f.name.clone())) {
             let name = Ident::new(&f.name, span);
             let value = util::hex(f.value);
+
+            item_names_str.push(&f.name);
+            item_values.push(value.clone());
+
             let doc = util::doc(&f.description);
             items.extend(quote!(
                 #doc
                 pub const #name: Self = Self(#value);
             ));
         }
 
+        let defmt = opts.defmt_feature.as_ref().map(|defmt_feature| {
+            quote! {
+                #[cfg(feature = #defmt_feature)]
+                impl defmt::Format for #name {
+                    fn format(&self, f: defmt::Formatter) {
+                        match self.0 {
+                            #(
+                                #item_values => defmt::write!(f, #item_names_str),
+                            )*
+                            other => defmt::write!(f, "0x{:02X}", other),
+                        }
+                    }
+                }
+            }
+        });
+
         out.extend(quote! {
             #doc
             #[repr(transparent)]
@@ -63,6 +85,20 @@ pub fn render(_opts: &super::Options, _ir: &IR, e: &Enum, path: &str) -> Result<
                     self.0
                 }
             }
+
+            impl core::fmt::Debug for #name {
+                fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
+                    match self.0 {
+                        #(
+                            #item_values => f.write_str(#item_names_str),
+                        )*
+                        other => core::write!(f, "0x{:02X}", other),
+                    }
+                }
+            }
+
+            #defmt
+
         });
     } else {
         let variants: BTreeMap<_, _> = e.variants.iter().map(|v| (v.value, v)).collect();
@@ -85,10 +121,17 @@ pub fn render(_opts: &super::Options, _ir: &IR, e: &Enum, path: &str) -> Result<
             }
         }
 
+        let defmt = opts.defmt_feature.as_ref().map(|defmt_feature| {
+            quote! {
+                #[cfg_attr(feature = #defmt_feature, derive(defmt::Format))]
+            }
+        });
+
         out.extend(quote! {
             #doc
             #[repr(#ty)]
-            #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd)]
+            #[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd)]
+            #defmt
             pub enum #name {
                 #items
             }

src/generate/fieldset.rs

@@ -1,16 +1,20 @@
 use anyhow::Result;
 use proc_macro2::TokenStream;
-use proc_macro2::{Ident, Span};
+use proc_macro2::{Ident, Literal, Span};
 use quote::quote;
 
 use crate::ir::*;
 use crate::util;
 
 use super::sorted;
 
-pub fn render(_opts: &super::Options, ir: &IR, fs: &FieldSet, path: &str) -> Result<TokenStream> {
+pub fn render(opts: &super::Options, ir: &IR, fs: &FieldSet, path: &str) -> Result<TokenStream> {
     let span = Span::call_site();
     let mut items = TokenStream::new();
+    let mut field_names = Vec::with_capacity(fs.fields.len());
+    let mut field_names_str = Vec::with_capacity(fs.fields.len());
+    let mut field_getters = Vec::with_capacity(fs.fields.len());
+    let mut field_types = Vec::with_capacity(fs.fields.len());
 
     let ty = match fs.bit_size {
         1..=8 => quote!(u8),
@@ -64,6 +68,18 @@ pub fn render(_opts: &super::Options, ir: &IR, fs: &FieldSet, path: &str) -> Res
             }
         }
 
+        field_names.push(name.clone());
+        field_names_str.push(f.name.as_str());
+        if let Some(array) = &f.array {
+            let len = array.len();
+            let i = 0..len;
+            field_types.push(quote!([#field_ty; #len]));
+            field_getters.push(quote!([#( self.#name(#i), )*]));
+        } else {
+            field_types.push(field_ty.clone());
+            field_getters.push(quote!(self.#name()));
+        }
+
         match off_in_reg {
             BitOffset::Regular(off_in_reg) => {
                 let off_in_reg = off_in_reg as usize;
@@ -165,9 +181,36 @@ pub fn render(_opts: &super::Options, ir: &IR, fs: &FieldSet, path: &str) -> Res
     }
 
     let (_, name) = super::split_path(path);
+    let name_str = {
+        let mut literal = Literal::string(name);
+        literal.set_span(span);
+        literal
+    };
     let name = Ident::new(name, span);
     let doc = util::doc(&fs.description);
 
+    let impl_defmt_format = opts.defmt_feature.as_ref().map(|defmt_feature| {
+        quote! {
+            #[cfg(feature = #defmt_feature)]
+            impl defmt::Format for #name {
+                fn format(&self, f: defmt::Formatter) {
+                    #[derive(defmt::Format)]
+                    struct #name {
+                        #(
+                            #field_names: #field_types,
+                        )*
+                    }
+                    let proxy = #name {
+                        #(
+                            #field_names: #field_getters,
+                        )*
+                    };
+                    defmt::write!(f, "{}", proxy)
+                }
+            }
+        }
+    });
+
     let out = quote! {
         #doc
         #[repr(transparent)]
@@ -184,6 +227,18 @@ pub fn render(_opts: &super::Options, ir: &IR, fs: &FieldSet, path: &str) -> Res
                 #name(0)
             }
         }
+
+        impl core::fmt::Debug for #name {
+            fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
+                f.debug_struct(#name_str)
+                #(
+                    .field(#field_names_str, &#field_getters)
+                )*
+                    .finish()
+            }
+        }
+
+        #impl_defmt_format
     };
 
     Ok(out)

src/generate/mod.rs

@@ -59,22 +59,76 @@ impl Module {
     }
 }
 
+#[derive(Debug, Default)]
 pub enum CommonModule {
+    #[default]
     Builtin,
     External(TokenStream),
 }
 
+/// Options for the code generator.
+///
+/// See the individual methods for the different options you can change.
+#[derive(Debug)]
 pub struct Options {
-    pub common_module: CommonModule,
+    common_module: CommonModule,
+    defmt_feature: Option<String>,
+}
+
+impl Default for Options {
+    fn default() -> Self {
+        Self::new()
+    }
 }
 
 impl Options {
+    /// Create new options with all values set to the default.
+    ///
+    /// This will use a builtin common module,
+    /// and adds `defmt` support to the generated code gated behind a `feature = "defmt"` flag.
+    pub fn new() -> Self {
+        Self {
+            common_module: CommonModule::Builtin,
+            defmt_feature: Some("defmt".into()),
+        }
+    }
+
+    /// Get the path to the common module.
     fn common_path(&self) -> TokenStream {
         match &self.common_module {
             CommonModule::Builtin => TokenStream::from_str("crate::common").unwrap(),
             CommonModule::External(path) => path.clone(),
         }
     }
+
+    /// Get the configuration of the common module.
+    pub fn common_module(&self) -> &CommonModule {
+        &self.common_module
+    }
+
+    /// Set the common module to use.
+    ///
+    /// Specify [`CommonModule::Builtin`] for a built-in common module,
+    /// or [`CommonModule::External`] to use an external common module.
+    pub fn with_common_module(mut self, common_module: CommonModule) -> Self {
+        self.common_module = common_module;
+        self
+    }
+
+    /// Set the feature for adding defmt support in the generated code.
+    ///
+    /// You can fully remove `defmt` support in the generated code by specifying `None`.
+    pub fn with_defmt_feature(mut self, defmt_feature: Option<String>) -> Self {
+        self.defmt_feature = defmt_feature;
+        self
+    }
+
+    /// Get the feature flag used to enable/disable `defmt` support in the generated code.
+    ///
+    /// If set to `None`, no `defmt` support will be added at all to the generated code.
+    pub fn defmt_feature(&self) -> Option<&str> {
+        self.defmt_feature.as_deref()
+    }
 }
 
 pub fn render(ir: &IR, opts: &Options) -> Result<TokenStream> {

src/ir.rs

@@ -99,6 +99,16 @@ pub enum Array {
     Cursed(CursedArray),
 }
 
+impl Array {
+    /// Get the number of elements in the array.
+    pub fn len(&self) -> usize {
+        match self {
+            Self::Regular(x) => x.len as usize,
+            Self::Cursed(x) => x.offsets.len(),
+        }
+    }
+}
+
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 pub struct RegularArray {
     pub len: u32,