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/* Footprint function generation for Rust ABI code */
use super::helpers::{
format_expr_to_rust, format_type_to_rust, is_nested_complex_type, primitive_to_rust_type,
};
use crate::abi::resolved::{ResolvedType, ResolvedTypeKind, Size};
use crate::abi::types::PrimitiveType;
use std::collections::BTreeMap;
use std::fmt::Write;
/* Recursively collect nested type definitions and emit their footprint functions */
pub fn collect_and_emit_nested_footprints(
type_def: &ResolvedType,
type_path: Option<&str>,
output: &mut String,
) {
/* Phase 1: Recursively process all nested complex types first */
match &type_def.kind {
ResolvedTypeKind::Struct { fields, .. } => {
let current_path = type_path.unwrap_or(&type_def.name);
for field in fields {
if is_nested_complex_type(&field.field_type) {
let nested_path = format!("{}_{}", current_path, field.name);
collect_and_emit_nested_footprints(
&field.field_type,
Some(&nested_path),
output,
);
}
}
}
ResolvedTypeKind::Union { variants } => {
let current_path = type_path.unwrap_or(&type_def.name);
for variant in variants {
if is_nested_complex_type(&variant.field_type) {
let nested_path = format!("{}_{}", current_path, variant.name);
collect_and_emit_nested_footprints(
&variant.field_type,
Some(&nested_path),
output,
);
}
}
}
ResolvedTypeKind::Enum { variants, .. } => {
let current_path = type_path.unwrap_or(&type_def.name);
for variant in variants {
if is_nested_complex_type(&variant.variant_type) {
let nested_path = format!("{}_{}", current_path, variant.name);
collect_and_emit_nested_footprints(
&variant.variant_type,
Some(&nested_path),
output,
);
}
}
}
ResolvedTypeKind::SizeDiscriminatedUnion { variants } => {
let current_path = type_path.unwrap_or(&type_def.name);
for variant in variants {
if is_nested_complex_type(&variant.variant_type) {
let nested_path = format!("{}_{}", current_path, variant.name);
collect_and_emit_nested_footprints(
&variant.variant_type,
Some(&nested_path),
output,
);
}
}
}
_ => {}
}
/* Phase 2: Emit footprint for current nested type (only if it's a nested path) */
if type_path.is_some() && is_nested_complex_type(type_def) {
let mut nested_type = type_def.clone();
nested_type.name = format!("{}_inner", type_path.unwrap());
output.push_str(&emit_footprint_fn(&nested_type));
}
}
fn emit_footprint_fn_struct(resolved_type: &ResolvedType) -> String {
let mut output = String::new();
let type_name = &resolved_type.name;
if let Size::Const(_size) = resolved_type.size {
/* Case 1: Constant size - emit simple sizeof function with no parameters */
write!(output, "pub fn {}_footprint() -> u64 {{\n", type_name).unwrap();
write!(
output,
" std::mem::size_of::<{}_t>() as u64\n",
type_name
)
.unwrap();
write!(output, "}}\n\n").unwrap();
return output;
}
let mut all_field_refs: BTreeMap<String, PrimitiveType> = BTreeMap::new();
if let Size::Variable(variable_refs) = &resolved_type.size {
for inner_refs in variable_refs.values() {
for (ref_path, prim_type) in inner_refs {
all_field_refs
.entry(ref_path.clone())
.or_insert_with(|| prim_type.clone());
}
}
}
// Collect tag parameters for size-discriminated union fields
let mut sdu_tag_params: Vec<String> = Vec::new();
if let ResolvedTypeKind::Struct { fields, .. } = &resolved_type.kind {
for field in fields {
if matches!(
&field.field_type.kind,
ResolvedTypeKind::SizeDiscriminatedUnion { .. }
) {
sdu_tag_params.push(format!("{}_tag: u8", field.name));
}
}
}
/* Generate function signature with field reference parameters */
write!(output, "pub fn {}_footprint(", type_name).unwrap();
if all_field_refs.is_empty() && sdu_tag_params.is_empty() {
write!(output, ") -> u64 {{\n").unwrap();
} else {
let mut params: Vec<String> = all_field_refs
.iter()
.map(|(ref_path, prim_type)| {
format!(
"{}: {}",
ref_path.replace('.', "_"),
primitive_to_rust_type(prim_type)
)
})
.collect();
params.extend(sdu_tag_params);
write!(output, "{}) -> u64 {{\n", params.join(", ")).unwrap();
}
let mut after_fam = false;
if let ResolvedTypeKind::Struct { fields, .. } = &resolved_type.kind {
for field in fields {
let is_fam = matches!(&field.field_type.size, Size::Variable(..));
if is_fam && !after_fam {
// For enum fields and size-discriminated unions, the body is inline bytes, not an actual struct field
if matches!(
&field.field_type.kind,
ResolvedTypeKind::Enum { .. } | ResolvedTypeKind::SizeDiscriminatedUnion { .. }
) {
write!(
output,
" let mut offset: u64 = std::mem::size_of::<{}_t>() as u64;\n",
type_name
)
.unwrap();
} else {
write!(
output,
" let mut offset: u64 = std::mem::offset_of!({}_t, {}) as u64;\n",
type_name, field.name
)
.unwrap();
}
after_fam = true;
}
if after_fam {
match &field.field_type.kind {
ResolvedTypeKind::Primitive { prim_type } => {
write!(
output,
" offset += std::mem::size_of::<{}>() as u64;\n",
primitive_to_rust_type(prim_type)
)
.unwrap();
}
ResolvedTypeKind::Array { element_type, .. } => {
if let Size::Variable(var_refs) = &field.field_type.size {
/* Get all field references for this FAM */
let field_refs: Vec<String> = var_refs
.values()
.flat_map(|refs| refs.keys().cloned())
.collect();
/* Build size expression */
let params: Vec<String> = all_field_refs.keys().cloned().collect();
let size_expr = if let Some(var_map) = var_refs.values().next() {
if let Some((first_ref, _)) = var_map.iter().next() {
format_expr_to_rust(
&crate::abi::expr::ExprKind::FieldRef(
crate::abi::expr::FieldRefExpr {
path: first_ref
.split('.')
.map(|s| s.to_string())
.collect(),
},
),
¶ms,
)
} else {
"0".to_string()
}
} else {
"0".to_string()
};
let elem_size = match &element_type.size {
Size::Const(s) => format!("{}", s),
Size::Variable(_) => {
/* Nested FAM - recursive footprint call */
let nested_params: Vec<String> =
field_refs.iter().map(|r| r.replace('.', "_")).collect();
if nested_params.is_empty() {
format!("{}_footprint()", format_type_to_rust(element_type))
} else {
format!(
"{}_footprint({})",
format_type_to_rust(element_type),
nested_params.join(", ")
)
}
}
};
write!(
output,
" offset += ({} * {}) as u64;\n",
size_expr, elem_size
)
.unwrap();
}
}
ResolvedTypeKind::SizeDiscriminatedUnion { variants } => {
// Size-discriminated union: size determined from tag parameter
let tag_param = format!("{}_tag", field.name);
write!(output, " offset += match {} {{\n", tag_param).unwrap();
for (idx, variant) in variants.iter().enumerate() {
write!(output, " {} => {},\n", idx, variant.expected_size)
.unwrap();
}
write!(output, " _ => 0, // Invalid tag\n").unwrap();
write!(output, " }} as u64;\n").unwrap();
}
ResolvedTypeKind::TypeRef { .. }
| ResolvedTypeKind::Struct { .. }
| ResolvedTypeKind::Union { .. } => {
if let Size::Variable(var_refs) = &field.field_type.size {
/* Variable-sized nested type */
let field_refs: Vec<String> = var_refs
.values()
.flat_map(|refs| refs.keys().map(|r| r.replace('.', "_")))
.collect();
if field_refs.is_empty() {
write!(
output,
" offset += {}_footprint() as u64;\n",
format_type_to_rust(&field.field_type)
)
.unwrap();
} else {
write!(
output,
" offset += {}_footprint({}) as u64;\n",
format_type_to_rust(&field.field_type),
field_refs.join(", ")
)
.unwrap();
}
} else {
/* Constant-sized nested type */
write!(
output,
" offset += std::mem::size_of::<{}>() as u64;\n",
format_type_to_rust(&field.field_type)
)
.unwrap();
}
}
_ => {}
}
}
}
}
if after_fam {
write!(output, " offset\n").unwrap();
} else {
write!(
output,
" std::mem::size_of::<{}_t>() as u64\n",
type_name
)
.unwrap();
}
write!(output, "}}\n\n").unwrap();
output
}
fn emit_footprint_fn_enum(resolved_type: &ResolvedType) -> String {
let mut output = String::new();
let type_name = &resolved_type.name;
if let Size::Const(_size) = resolved_type.size {
/* Constant size enum */
write!(output, "pub fn {}_footprint() -> u64 {{\n", type_name).unwrap();
write!(
output,
" std::mem::size_of::<{}_t>() as u64\n",
type_name
)
.unwrap();
write!(output, "}}\n\n").unwrap();
return output;
}
/* Variable size enum - needs variant parameter */
if let ResolvedTypeKind::Enum { variants, .. } = &resolved_type.kind {
/* Collect all field references from all variants */
let mut all_field_refs: BTreeMap<String, PrimitiveType> = BTreeMap::new();
for variant in variants {
if let Size::Variable(var_refs) = &variant.variant_type.size {
for inner_refs in var_refs.values() {
for (ref_path, prim_type) in inner_refs {
all_field_refs
.entry(ref_path.clone())
.or_insert_with(|| prim_type.clone());
}
}
}
}
write!(output, "pub fn {}_footprint(tag: u64", type_name).unwrap();
for (ref_path, prim_type) in &all_field_refs {
write!(
output,
", {}: {}",
ref_path.replace('.', "_"),
primitive_to_rust_type(prim_type)
)
.unwrap();
}
write!(output, ") -> u64 {{\n").unwrap();
write!(output, " match tag {{\n").unwrap();
for variant in variants {
write!(output, " {} => ", variant.tag_value).unwrap();
if let Size::Const(s) = variant.variant_type.size {
write!(output, "{},\n", s).unwrap();
} else {
/* Variable-sized variant */
if let Size::Variable(var_refs) = &variant.variant_type.size {
let field_refs: Vec<String> = var_refs
.values()
.flat_map(|refs| refs.keys().map(|r| r.replace('.', "_")))
.collect();
if field_refs.is_empty() {
write!(
output,
"{}_footprint(),\n",
format_type_to_rust(&variant.variant_type)
)
.unwrap();
} else {
write!(
output,
"{}_footprint({}),\n",
format_type_to_rust(&variant.variant_type),
field_refs.join(", ")
)
.unwrap();
}
} else {
write!(
output,
"std::mem::size_of::<{}>() as u64,\n",
format_type_to_rust(&variant.variant_type)
)
.unwrap();
}
}
}
write!(output, " _ => 0, /* Invalid tag */\n").unwrap();
write!(output, " }}\n").unwrap();
write!(output, "}}\n\n").unwrap();
}
output
}
fn emit_footprint_fn_union(resolved_type: &ResolvedType) -> String {
let mut output = String::new();
let type_name = &resolved_type.name;
/* Unions always have constant size (size of largest variant) */
write!(output, "pub fn {}_footprint() -> u64 {{\n", type_name).unwrap();
write!(
output,
" std::mem::size_of::<{}_t>() as u64\n",
type_name
)
.unwrap();
write!(output, "}}\n\n").unwrap();
output
}
pub fn emit_footprint_fn(resolved_type: &ResolvedType) -> String {
match &resolved_type.kind {
ResolvedTypeKind::Struct { .. } => emit_footprint_fn_struct(resolved_type),
ResolvedTypeKind::Enum { .. } => emit_footprint_fn_enum(resolved_type),
ResolvedTypeKind::Union { .. } => emit_footprint_fn_union(resolved_type),
ResolvedTypeKind::SizeDiscriminatedUnion { .. } => emit_footprint_fn_union(resolved_type),
_ => String::new(),
}
}