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wasi-headers: unions are tagged now

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This commit is contained in:
Pat Hickey 2020-02-06 13:19:44 -08:00
parent 3af77075aa
commit 71d279a4b0
1 changed files with 42 additions and 12 deletions
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54
tools/wasi-headers/src/c_header.rs
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@ -308,23 +308,36 @@ fn print_struct(ret: &mut String, name: &Id, s: &StructDatatype) {
}
fn print_union(ret: &mut String, name: &Id, u: &UnionDatatype) {
ret.push_str(&format!("typedef union __wasi_{}_t {{\n", ident_name(name)));
ret.push_str(&format!(
"typedef union __wasi_{}_u_t {{\n",
ident_name(name)
));
for variant in &u.variants {
if !variant.docs.is_empty() {
ret.push_str(" /**\n");
for line in variant.docs.lines() {
ret.push_str(&format!(" * {}\n", line));
if let Some(ref tref) = variant.tref {
if !variant.docs.is_empty() {
ret.push_str(" /**\n");
for line in variant.docs.lines() {
ret.push_str(&format!(" * {}\n", line));
}
ret.push_str(" */\n");
}
ret.push_str(" */\n");
ret.push_str(&format!(
" {} {};\n",
typeref_name(tref),
ident_name(&variant.name)
));
}
ret.push_str(&format!(
" {} {};\n",
typeref_name(&variant.tref),
ident_name(&variant.name)
));
ret.push_str("\n");
}
ret.push_str(&format!("}} __wasi_{}_u_t;\n", ident_name(name)));
ret.push_str(&format!(
"typedef struct __wasi_{}_t {{\n",
ident_name(name)
));
ret.push_str(&format!(" {} tag;\n", typeref_name(&u.tag)));
ret.push_str(&format!(" __wasi_{}_u_t u;\n", ident_name(name)));
ret.push_str(&format!("}} __wasi_{}_t;\n", ident_name(name)));
ret.push_str("\n");
@ -340,6 +353,23 @@ fn print_union(ret: &mut String, name: &Id, u: &UnionDatatype) {
u.mem_align()
));
let l = u.union_layout();
ret.push_str(&format!(
"_Static_assert(offsetof(__wasi_{}_t, u) == {}, \"witx calculated union offset\");\n",
ident_name(name),
l.contents_offset,
));
ret.push_str(&format!(
"_Static_assert(sizeof(__wasi_{}_u_t) == {}, \"witx calculated union size\");\n",
ident_name(name),
l.contents_size,
));
ret.push_str(&format!(
"_Static_assert(_Alignof(__wasi_{}_u_t) == {}, \"witx calculated union align\");\n",
ident_name(name),
l.contents_align,
));
ret.push_str("\n");
}