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compiler, runtime, common: (Initial) Support For extern Declarations

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Especially FFI

Signed-off-by: Will Hawkins <hawkinsw@obs.cr>
This commit is contained in:
Will Hawkins
2026-04-23 06:07:07 -04:00
parent 74fead1eba
commit f2bd53ce5f
17 changed files with 693 additions and 247 deletions
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Sources/P4Lang/Program.swift
+28 -4
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@@ -27,12 +27,13 @@ public struct ExpressionStatement {
public struct Program {
public var types: [P4DataType] = Array()
public var externs: [P4DataType] = Array()
public var instances: [P4Type] = Array()
/// Type of closure for filtering results from ``Program/InstancesWithTypes(_:)``
public typealias AttributedTypeFilter = (P4Type) -> Bool
public typealias TypeFilter = (P4Type) -> Bool
/// Type of closure for filtering results from ``Program/TypesWithTypes(_:)``
public typealias TypeFilter = (P4DataType) -> Bool
public typealias DataTypeFilter = (P4DataType) -> Bool
/// Retrieve global instances in the compiled P4 program.
public func InstancesWithTypes() -> [P4Type] {
@@ -51,7 +52,7 @@ public struct Program {
///
/// @Snippet(path: "use-program-instanceswithtypes", slice: "include")
///
public func InstancesWithTypes(_ filter: AttributedTypeFilter) -> [P4Type] {
public func InstancesWithTypes(_ filter: TypeFilter) -> [P4Type] {
return self.instances.filter { instance in
filter(instance)
}
@@ -74,12 +75,35 @@ public struct Program {
///
/// @Snippet(path: "use-program-typeswithtypes", slice: "include")
///
public func TypesWithTypes(_ filter: TypeFilter) -> [P4DataType] {
public func TypesWithTypes(_ filter: DataTypeFilter) -> [P4DataType] {
return self.types.filter { instance in
filter(instance)
}
}
/// Retrieve extern types in the compiled P4 program.
public func Externs() -> [P4DataType] {
return self.externs
}
/// Retrieve extern types declared in the compiled P4 program.
///
/// Use the given filter to select which of the extern types
/// declared in the compiled P4 program to retrieve.
///
/// If the compiled P4 program (from the source in the
/// string `p4_program_with_struct_decl`) has two extern structs declared and
/// you only want to select the one named `agg`, you could
/// use a filter like
///
/// @Snippet(path: "use-program-typeswithtypes", slice: "include")
///
public func Externs(_ filter: DataTypeFilter) -> [P4DataType] {
return self.externs.filter { instance in
filter(instance)
}
}
/// Find the program's main parser
///
/// Note: For now, the main parser is expected to be named main_parser.