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cgen: filter + expected_type fix

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This commit is contained in:
Alexander Medvednikov 2020-03-19 15:18:29 +01:00
parent 0fbb056ac7
commit 216c7a16d8
2 changed files with 37 additions and 0 deletions
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2
vlib/v/checker/checker.v
View File

@ -526,6 +526,7 @@ fn (c mut Checker) stmt(node ast.Stmt) {
match mut node {
ast.AssignStmt {
c.assign_stmt(mut it)
c.expected_type = table.void_type
}
// ast.Attr {}
// ast.CompIf {}
@ -544,6 +545,7 @@ fn (c mut Checker) stmt(node ast.Stmt) {
}
ast.ExprStmt {
c.expr(it.expr)
c.expected_type = table.void_type
}
ast.FnDecl {
c.expected_type = table.void_type

35
vlib/v/gen/cgen.v
View File

@ -23,6 +23,7 @@ mut:
is_amp bool // for `&Foo{}` to merge PrefixExpr `&` and StructInit `Foo{}`; also for `&byte(0)` etc
optionals []string // to avoid duplicates TODO perf, use map
inside_ternary bool // ?: comma separated statements on a single line
stmt_start_pos int
}
pub fn cgen(files []ast.File, table &table.Table) string {
@ -199,6 +200,7 @@ fn (g mut Gen) stmts(stmts []ast.Stmt) {
}
fn (g mut Gen) stmt(node ast.Stmt) {
g.stmt_start_pos = g.out.len
// println('cgen.stmt()')
// g.writeln('//// stmt start')
match node {
@ -747,6 +749,10 @@ fn (g mut Gen) expr(node ast.Expr) {
typ_sym := g.table.get_type_symbol(it.receiver_type)
// rec_sym := g.table.get_type_symbol(it.receiver_type)
mut receiver_name := typ_sym.name
if typ_sym.kind == .array && it.name == 'filter' {
g.gen_filter(it)
return
}
if typ_sym.kind == .array && it.name in
// TODO performance, detect `array` method differently
['repeat', 'sort_with_compare', 'free', 'push_many', 'trim',
@ -1599,6 +1605,35 @@ fn (g &Gen) sort_structs(types []table.TypeSymbol) []table.TypeSymbol {
return types_sorted
}
fn (g mut Gen) gen_filter(node ast.MethodCallExpr) {
tmp := g.new_tmp_var()
buf := g.out.buf[g.stmt_start_pos..]
s := string(buf.clone()) // the already generated part of current statement
g.out.go_back(s.len)
// println('filter s="$s"')
sym := g.table.get_type_symbol(node.return_type)
if sym.kind != .array {
verror('filter() requires an array')
}
info := sym.info as table.Array
styp := g.typ(node.return_type)
elem_type_str := g.typ(info.elem_type)
g.write('\nint ${tmp}_len = ')
g.expr(node.expr)
g.writeln('.len;')
g.writeln('$styp $tmp = new_array(0, ${tmp}_len, sizeof($elem_type_str));')
g.writeln('for (int i = 0; i < ${tmp}_len; i++) {')
g.write(' $elem_type_str it = (($elem_type_str*) ')
g.expr(node.expr)
g.writeln('.data)[i];')
g.write('if (')
g.expr(node.args[0].expr) // the first arg is the filter condition
g.writeln(') array_push(&$tmp, &it); \n }')
g.write(s)
g.write(' ')
g.write(tmp)
}
fn op_to_fn_name(name string) string {
return match name {
'+'{