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boot/ is a second Finch compiler written in Finch (lexer, parser, type checker and an LLVM IR text generator, ~3k lines). Built by the C++ compiler it compiles itself; stage 2 and stage 3 produce byte-identical IR. It covers the core language: functions, structs, arrays, str, pointers, loops and modules (no C imports, sized numbers or defer), copies values like the main compiler and leaves freeing memory to the operating system. tests/boot.sh checks the fixpoint and runs the test programs it supports. Also: shell(cmd) built-in. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
94 lines
2.3 KiB
Text
94 lines
2.3 KiB
Text
// The syntax tree of the self-hosted compiler.
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// A type as written or resolved.
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// kind: "void" "int" "bool" "char" "float" "str" "null" "ptr" "array" "named" "struct"
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// elem: the element of an array or the target of a ptr (zero or one entry)
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// name, module: structs ("" module = the main file)
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struct Type {
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str kind
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[]Type elem
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str name
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str module
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}
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fn simple(str kind) -> Type {
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return Type(kind: kind)
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}
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fn arrayOf(Type t) -> Type {
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out := Type(kind: "array")
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out.elem.push(t)
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return out
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}
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fn ptrTo(Type t) -> Type {
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out := Type(kind: "ptr")
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out.elem.push(t)
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return out
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}
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fn same(Type a, Type b) -> bool {
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if a.kind != b.kind {
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return false
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}
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if a.kind == "struct" || a.kind == "named" {
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return a.name == b.name && a.module == b.module
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}
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if a.kind == "array" || a.kind == "ptr" {
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if a.elem.len != b.elem.len {
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return false
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}
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if a.elem.len == 0 {
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return true
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}
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return same(a.elem[0], b.elem[0])
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}
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return true
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}
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fn show(Type t) -> str {
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if t.kind == "array" {
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return "[]" + show(t.elem[0])
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}
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if t.kind == "ptr" {
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if t.elem.len == 0 {
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return "ptr"
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}
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return "ptr[" + show(t.elem[0]) + "]"
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}
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if t.kind == "struct" || t.kind == "named" {
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if t.module.len > 0 {
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return t.module + "." + t.name
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}
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return t.name
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}
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if t.kind == "void" {
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return "nothing"
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}
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return t.kind
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}
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// One node of the tree, for expressions, statements, functions and structs alike.
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// expressions: int float str char bool null var unary binary call member index array method
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// statements: decl assign expr if while for each return break continue block
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// top level: fn param struct field
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struct Node {
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str kind
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str name // identifier, operator, callee, field or method name
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str text // literal text
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Type ty // declared type (decl, param, field, fn result)
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bool flag // decl: has a type; fn: has a body
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[]Node kids
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[]str names // named arguments: Point(x: 1)
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int line
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int col
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int file
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}
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struct Program {
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str module
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str path
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[]str imports // Finch modules
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[]Node structs
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[]Node fns
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}
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