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js: add draft support for -skip-unused (hello_world.v works)

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This commit is contained in:
Delyan Angelov
2021-10-12 19:22:16 +03:00
parent 1d2b56d71d
commit 6c728cf389
2 changed files with 41 additions and 4 deletions
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27
vlib/v/gen/js/fn.v
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@ -381,6 +381,27 @@ fn (g &JsGen) fn_gen_type(it &ast.FnDecl) FnGenType {
}
}
fn (mut g JsGen) is_used_by_main(node ast.FnDecl) bool {
mut is_used_by_main := true
if g.pref.skip_unused {
fkey := node.fkey()
is_used_by_main = g.table.used_fns[fkey]
$if trace_skip_unused_fns ? {
println('> is_used_by_main: $is_used_by_main | node.name: $node.name | fkey: $fkey | node.is_method: $node.is_method')
}
if !is_used_by_main {
$if trace_skip_unused_fns_in_js_code ? {
g.writeln('// trace_skip_unused_fns_in_js_code, $node.name, fkey: $fkey')
}
}
} else {
$if trace_skip_unused_fns_in_js_code ? {
g.writeln('// trace_skip_unused_fns_in_js_code, $node.name, fkey: $node.fkey()')
}
}
return is_used_by_main
}
fn (mut g JsGen) gen_fn_decl(it ast.FnDecl) {
res := g.fn_gen_type(it)
if it.language == .js {
@ -389,6 +410,12 @@ fn (mut g JsGen) gen_fn_decl(it ast.FnDecl) {
if g.inside_builtin {
g.builtin_fns << it.name
}
if !g.is_used_by_main(it) {
return
}
if it.should_be_skipped {
return
}
cur_fn_decl := g.fn_decl
g.gen_method_decl(it, res)
g.fn_decl = cur_fn_decl