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Add a body to the function

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This commit is contained in:
Brian Carroll 2021-08-29 21:07:15 +01:00
parent 4d76b9d15d
commit 6500cb3c35
1 changed files with 16 additions and 11 deletions
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27
compiler/gen_wasm/src/lib.rs
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@ -1,6 +1,6 @@
use bumpalo::{Bump};
use bumpalo::Bump;
use parity_wasm::builder::{CodeLocation, ModuleBuilder};
use parity_wasm::elements::{Internal, ValueType, Local};
use parity_wasm::elements::{Instruction, Instructions, Internal, Local, ValueType};
use parity_wasm::{builder, elements};
// use roc_builtins::bitcode;
@ -47,8 +47,9 @@ struct SymbolStorage(LocalId, WasmLayout);
// Emscripten leaves 1kB free so let's do the same for now, although 4 bytes would probably do.
const UNUSED_DATA_SECTION_BYTES: u32 = 1024;
// State that gets reset for every generated function
// State for generating a single function
struct FunctionGenerator {
instructions: std::vec::Vec<Instruction>,
joinpoint_label_map: MutMap<JoinPointId, LabelId>,
locals: std::vec::Vec<Local>,
symbol_storage_map: MutMap<Symbol, SymbolStorage>,
@ -58,6 +59,7 @@ struct FunctionGenerator {
impl FunctionGenerator {
fn new() -> Self {
FunctionGenerator {
instructions: std::vec::Vec::new(),
joinpoint_label_map: MutMap::default(),
symbol_storage_map: MutMap::default(),
stack_memory: 0,
@ -116,7 +118,6 @@ struct BackendWasm<'a> {
module_builder: ModuleBuilder,
data_offset_map: MutMap<Literal<'a>, u32>,
data_offset_next: u32,
func_gen: FunctionGenerator,
}
impl<'a> BackendWasm<'a> {
@ -126,12 +127,11 @@ impl<'a> BackendWasm<'a> {
module_builder: builder::module(),
data_offset_map: MutMap::default(),
data_offset_next: UNUSED_DATA_SECTION_BYTES,
func_gen: FunctionGenerator::new(),
}
}
fn build_proc(&mut self, proc: Proc<'a>) -> Result<CodeLocation, String> {
self.func_gen.reset();
let mut func_gen = FunctionGenerator::new(); // yeah probably don't need to allocate a new one every time, but tell that to the borrow checker! ;-)
let ret_layout = WasmLayout::new(&proc.ret_layout)?;
let ret_value_type = ret_layout.value_type;
@ -148,7 +148,7 @@ impl<'a> BackendWasm<'a> {
for (layout, symbol) in proc.args {
let wasm_layout = WasmLayout::new(layout)?;
arg_types.push(wasm_layout.value_type);
self.func_gen.insert_local(wasm_layout, *symbol);
func_gen.insert_local(wasm_layout, *symbol);
}
let signature = builder::signature()
@ -156,16 +156,21 @@ impl<'a> BackendWasm<'a> {
.with_result(ret_value_type)
.build_sig();
self.build_stmt(&proc.body, &proc.ret_layout)?;
self.build_stmt(&mut func_gen, &proc.body, &proc.ret_layout)?;
let function_def = builder::function().with_signature(signature).build();
let function_def = builder::function()
.with_signature(signature)
.body()
.with_locals(func_gen.locals)
.with_instructions(Instructions::new(func_gen.instructions))
.build() // body
.build(); // function
let location = self.module_builder.push_function(function_def);
Ok(location)
}
fn build_stmt(&mut self, stmt: &Stmt<'a>, ret_layout: &Layout<'a>) -> Result<(), String> {
fn build_stmt(&mut self, func_gen: &mut FunctionGenerator, stmt: &Stmt<'a>, ret_layout: &Layout<'a>) -> Result<(), String> {
Err("todo: everything".to_string())
}