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cgen: generate smaller switch statements for sumtypes/enums with else{}

pull/13777/head
Delyan Angelov 2022-03-19 20:55:32 +02:00
parent eb7c9cec3d
commit 02b889dac3
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GPG Key ID: 66886C0F12D595ED
2 changed files with 5 additions and 11 deletions
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13
vlib/v/gen/c/match.v
View File

@ -183,7 +183,6 @@ fn (mut g Gen) match_expr_sumtype(node ast.MatchExpr, is_expr bool, cond_var str
}
fn (mut g Gen) match_expr_switch(node ast.MatchExpr, is_expr bool, cond_var string, tmp_var string, enum_typ ast.TypeSymbol) {
cname := '${enum_typ.cname}__'
mut covered_enum := []string{cap: (enum_typ.info as ast.Enum).vals.len} // collects missing enum variant branches to avoid cstrict errors
mut range_branches := []ast.MatchBranch{cap: node.branches.len} // branches have RangeExpr cannot emit as switch case branch, we handle it in default branch
mut default_generated := false
@ -192,11 +191,6 @@ fn (mut g Gen) match_expr_switch(node ast.MatchExpr, is_expr bool, cond_var stri
g.indent++
for branch in node.branches {
if branch.is_else {
for val in (enum_typ.info as ast.Enum).vals {
if val !in covered_enum {
g.writeln('case $cname$val:')
}
}
g.writeln('default:')
default_generated = true
if range_branches.len > 0 {
@ -233,7 +227,7 @@ fn (mut g Gen) match_expr_switch(node ast.MatchExpr, is_expr bool, cond_var stri
}
g.writeln(') {')
g.stmts_with_tmp_var(range_branch.stmts, tmp_var)
g.writeln('break;')
g.writeln('\tbreak;')
g.writeln('}')
}
g.indent--
@ -259,7 +253,8 @@ fn (mut g Gen) match_expr_switch(node ast.MatchExpr, is_expr bool, cond_var stri
}
g.stmts_with_tmp_var(branch.stmts, tmp_var)
g.expected_cast_type = 0
g.writeln('} break;')
g.writeln('\tbreak;')
g.writeln('}')
g.indent--
}
if range_branches.len > 0 && !default_generated {
@ -297,7 +292,7 @@ fn (mut g Gen) match_expr_switch(node ast.MatchExpr, is_expr bool, cond_var stri
}
g.writeln(') {')
g.stmts_with_tmp_var(range_branch.stmts, tmp_var)
g.writeln('break;')
g.writeln('\tbreak;')
g.writeln('}')
}
g.indent--

3
vlib/v/gen/c/testdata/enum_switch_case.c.must_have vendored
View File

@ -1,5 +1,4 @@
case main__Enum__e1:
case main__Enum__e4:
case main__Enum__e6:
default:
(e >= 4 && e <= 5)
(e >= 4 && e <= 5)