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add compile error for missing enumeration value in switch

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This commit is contained in:
Andrew Kelley 2016-02-11 16:15:08 -07:00
parent a180168871
commit 08eb19456b
2 changed files with 42 additions and 0 deletions
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25
src/analyze.cpp
View File

@ -4241,6 +4241,8 @@ static TypeTableEntry *analyze_builtin_fn_call_expr(CodeGen *g, ImportTableEntry
return resolve_expr_const_val_as_bool(g, node, g->is_release_build, true);
} else if (buf_eql_str(&var_name, "is_test")) {
return resolve_expr_const_val_as_bool(g, node, g->is_test_build, true);
} else if (buf_eql_str(&var_name, "os")) {
zig_panic("TODO");
} else {
add_node_error(g, *str_node,
buf_sprintf("unrecognized compile variable: '%s'", buf_ptr(&var_name)));
@ -4650,6 +4652,11 @@ static TypeTableEntry *analyze_switch_expr(CodeGen *g, ImportTableEntry *import,
buf_sprintf("switch on unreachable expression not allowed"));
return g->builtin_types.entry_invalid;
} else {
int *field_use_counts = nullptr;
if (expr_type->id == TypeTableEntryIdEnum) {
field_use_counts = allocate<int>(expr_type->data.enumeration.field_count);
}
AstNode *else_prong = nullptr;
for (int prong_i = 0; prong_i < prong_count; prong_i += 1) {
AstNode *prong_node = node->data.switch_expr.prongs.at(prong_i);
@ -4686,6 +4693,14 @@ static TypeTableEntry *analyze_switch_expr(CodeGen *g, ImportTableEntry *import,
if (type_enum_field->type_entry != var_type) {
all_agree_on_var_type = false;
}
uint32_t field_index = type_enum_field->value;
assert(field_use_counts);
field_use_counts[field_index] += 1;
if (field_use_counts[field_index] > 1) {
add_node_error(g, item_node,
buf_sprintf("duplicate switch value: '%s'",
buf_ptr(type_enum_field->name)));
}
} else {
add_node_error(g, item_node,
buf_sprintf("enum '%s' has no field '%s'",
@ -4729,6 +4744,16 @@ static TypeTableEntry *analyze_switch_expr(CodeGen *g, ImportTableEntry *import,
prong_node->data.switch_prong.expr);
peer_nodes[prong_i] = prong_node->data.switch_prong.expr;
}
if (expr_type->id == TypeTableEntryIdEnum && !else_prong) {
for (uint32_t i = 0; i < expr_type->data.enumeration.field_count; i += 1) {
if (field_use_counts[i] == 0) {
add_node_error(g, node,
buf_sprintf("enumeration value '%s' not handled in switch",
buf_ptr(expr_type->data.enumeration.fields[i].name)));
}
}
}
}
return resolve_peer_type_compatibility(g, import, context, node, peer_nodes, peer_types, prong_count);
}

17
test/run_tests.cpp
View File

@ -1760,6 +1760,23 @@ const float_x = f32(1.0) / f32(0.0);
".tmp_source.zig:3:25: error: division by zero is undefined",
".tmp_source.zig:4:22: error: division by zero is undefined",
".tmp_source.zig:5:26: error: division by zero is undefined");
add_compile_fail_case("missing switch prong", R"SOURCE(
enum Number {
One,
Two,
Three,
Four,
}
fn f(n: Number) -> i32 {
switch (n) {
One => 1,
Two => 2,
Three => 3,
}
}
)SOURCE", 1, ".tmp_source.zig:9:5: error: enumeration value 'Four' not handled in switch");
}
//////////////////////////////////////////////////////////////////////////////