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Merge remote-tracking branch 'origin/trunk' into assoc-list-dict

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Folkert 2022-07-13 20:44:28 +02:00
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41 changed files with 949 additions and 131 deletions
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33
crates/compiler/gen_wasm/src/low_level.rs
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@ -243,6 +243,7 @@ impl<'a> LowLevelCall<'a> {
StrCountUtf8Bytes => {
self.load_args_and_call_zig(backend, bitcode::STR_COUNT_UTF8_BYTES)
}
StrGetCapacity => self.load_args_and_call_zig(backend, bitcode::STR_CAPACITY),
StrToNum => {
let number_layout = match self.ret_layout {
Layout::Struct { field_layouts, .. } => field_layouts[0],
@ -308,7 +309,37 @@ impl<'a> LowLevelCall<'a> {
let (local_id, offset) =
location.local_and_offset(backend.storage.stack_frame_pointer);
backend.code_builder.get_local(local_id);
backend.code_builder.i32_load(Align::Bytes4, offset + 4);
// List is stored as (pointer, length, capacity),
// with each of those fields being 4 bytes on wasm.
// So the length is 4 bytes after the start of the struct.
//
// WRAPPER_LEN represents the index of the length field
// (which is 1 as of the writing of this comment). If the field order
// ever changes, WRAPPER_LEN should be updated and this logic should
// continue to work even though this comment may become inaccurate.
backend
.code_builder
.i32_load(Align::Bytes4, offset + (4 * Builtin::WRAPPER_LEN));
}
_ => internal_error!("invalid storage for List"),
},
ListGetCapacity => match backend.storage.get(&self.arguments[0]) {
StoredValue::StackMemory { location, .. } => {
let (local_id, offset) =
location.local_and_offset(backend.storage.stack_frame_pointer);
backend.code_builder.get_local(local_id);
// List is stored as (pointer, length, capacity),
// with each of those fields being 4 bytes on wasm.
// So the capacity is 8 bytes after the start of the struct.
//
// WRAPPER_CAPACITY represents the index of the capacity field
// (which is 2 as of the writing of this comment). If the field order
// ever changes, WRAPPER_CAPACITY should be updated and this logic should
// continue to work even though this comment may become inaccurate.
backend
.code_builder
.i32_load(Align::Bytes4, offset + (4 * Builtin::WRAPPER_CAPACITY));
}
_ => internal_error!("invalid storage for List"),
},