tiny.chant.lower.scope

1pub const scope = @import("scope.zig");

1const choir = @import("choir");2const ast = @import("../ast/root.zig");3const context = @import("context.zig");4const Error = @import("error.zig").Error;56const Lowerer = context.Lowerer;7const Local = context.Local;89pub fn push(lowerer: *Lowerer) Error!void {10    try lowerer.scopes.append(lowerer.gpa, .empty);11}1213pub fn pop(lowerer: *Lowerer) void {14    var current = lowerer.scopes.pop() orelse return;15    current.deinit(lowerer.gpa);16}1718pub fn lookup(lowerer: *const Lowerer, name: []const u8) ?Local {19    var i = lowerer.scopes.items.len;20    while (i > 0) {21        i -= 1;22        if (lowerer.scopes.items[i].get(name)) |local| return local;23    }24    return null;25}2627pub fn bind(lowerer: *Lowerer, name: []const u8, local: Local) Error!void {28    const top = &lowerer.scopes.items[lowerer.scopes.items.len - 1];29    try top.put(lowerer.gpa, name, local);30}3132pub fn bindLoopVariable(lowerer: *Lowerer, name: []const u8, value: *choir.Value, c_type: *const ast.Type) Error!void {33    try bind(lowerer, name, .{ .kind = .loop_iv, .value = value, .c_type = c_type });34}