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Create type declarations for extern functions and write the 'import' section

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This commit is contained in:
Luuk de Gram
2021-02-03 22:15:18 +01:00
parent 300ebbd560
commit aa3e0ff454
3 changed files with 93 additions and 15 deletions
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28
src/codegen/wasm.zig
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@@ -163,13 +163,18 @@ pub const Context = struct {
try self.genFunctype();
const writer = self.code.writer();
// Reserve space to write the size after generating the code as well as space for locals count
try self.code.resize(10);
// Write instructions
// TODO: check for and handle death of instructions
const tv = self.decl.typed_value.most_recent.typed_value;
const mod_fn = tv.val.castTag(.function).?.data;
const mod_fn = blk: {
if (tv.val.castTag(.function)) |func| break :blk func.data;
if (tv.val.castTag(.extern_fn)) |ext_fn| return; // don't need codegen for extern functions
return self.fail(self.decl.src(), "TODO: Wasm codegen for decl type '{s}'", .{tv.ty.tag()});
};
// Reserve space to write the size after generating the code as well as space for locals count
try self.code.resize(10);
try self.genBody(mod_fn.body);
// finally, write our local types at the 'offset' position
@@ -239,9 +244,16 @@ pub const Context = struct {
fn genCall(self: *Context, inst: *Inst.Call) InnerError!WValue {
const func_inst = inst.func.castTag(.constant).?;
const func = func_inst.val.castTag(.function).?.data;
const target = func.owner_decl;
const target_ty = target.typed_value.most_recent.typed_value.ty;
const func_val = inst.func.value().?;
const target = blk: {
if (func_val.castTag(.function)) |func| {
break :blk func.data.owner_decl;
} else if (func_val.castTag(.extern_fn)) |ext_fn| {
break :blk ext_fn.data;
}
return self.fail(inst.base.src, "Expected a function, but instead found type '{s}'", .{func_val.tag()});
};
for (inst.args) |arg| {
const arg_val = self.resolveInst(arg);
@@ -495,7 +507,7 @@ pub const Context = struct {
}
fn genBr(self: *Context, br: *Inst.Br) InnerError!WValue {
// of operand has codegen bits we should break with a value
// if operand has codegen bits we should break with a value
if (br.operand.ty.hasCodeGenBits()) {
const operand = self.resolveInst(br.operand);
try self.emitWValue(operand);