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for: ranging through fixed size arrays

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This commit is contained in:
Alexander Medvednikov 2019-12-05 02:11:51 +03:00
parent fb546f376e
commit 867f952d6b
2 changed files with 16 additions and 5 deletions
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15
vlib/compiler/for.v
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@ -141,18 +141,19 @@ fn (p mut Parser) for_st() {
if p.pref.x64 {
label = p.x64.gen_loop_start(expr.int())
//to = range_expr.int() // TODO why empty?
}
}
}
is_arr := typ.contains('array')
is_fixed := typ.starts_with('[')
is_str := typ == 'string'
if !is_arr && !is_str && !is_range && !is_variadic_arg {
if !is_arr && !is_str && !is_range && !is_fixed && !is_variadic_arg {
p.error('cannot range over type `$typ`')
}
if !is_variadic_arg {
if p.is_js {
p.genln('var $tmp = $expr;')
} else {
} else if !is_fixed { // Don't copy if it's a fixed array
p.genln('$typ $tmp = $expr;')
}
}
@ -174,6 +175,10 @@ fn (p mut Parser) for_st() {
typ = 'byte'
p.gen_for_str_header(i, tmp, typ, val)
}
else if is_fixed {
typ = typ.all_after(']')
p.gen_for_fixed_header(i, expr, typ, val)
}
// println('for typ=$typ vartyp=$var_typ')
// Register temp var
if val != '_' {
@ -201,6 +206,6 @@ fn (p mut Parser) for_st() {
p.returns = false // TODO handle loops that are guaranteed to return
if label > 0 {
p.x64.gen_loop_end(to, label)
}
}
}

6
vlib/compiler/gen_c.v
View File

@ -365,6 +365,12 @@ fn (p mut Parser) gen_for_header(i, tmp, var_typ, val string) {
p.genln('$var_typ $val = (($var_typ *) $tmp . data)[$i];')
}
fn (p mut Parser) gen_for_fixed_header(i, tmp, var_typ, val string) {
p.genln('for (int $i = 0; $i < sizeof(${tmp}) / sizeof($tmp [0]); $i++) {')
if val == '_' { return }
p.genln('$var_typ $val = $tmp[$i];')
}
fn (p mut Parser) gen_for_str_header(i, tmp, var_typ, val string) {
// TODO var_typ is always byte
//p.genln('array_byte bytes_$tmp = string_bytes( $tmp );')