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stage2: implement errunion_payload_ptr_set

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This commit is contained in:
Veikka Tuominen
2022-02-19 19:21:49 +02:00
parent 89f6ff1771
commit 27c63bf433
12 changed files with 85 additions and 2 deletions
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7
src/codegen/c.zig
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@@ -1753,6 +1753,7 @@ fn genBody(f: *Function, body: []const Air.Inst.Index) error{ AnalysisFail, OutO
.unwrap_errunion_err_ptr => try airUnwrapErrUnionErr(f, inst),
.wrap_errunion_payload => try airWrapErrUnionPay(f, inst),
.wrap_errunion_err => try airWrapErrUnionErr(f, inst),
.errunion_payload_ptr_set => try airErrUnionPayloadPtrSet(f, inst),
// zig fmt: on
};
switch (result_value) {
@@ -3164,6 +3165,7 @@ fn airWrapOptional(f: *Function, inst: Air.Inst.Index) !CValue {
try writer.writeAll("};\n");
return local;
}
fn airWrapErrUnionErr(f: *Function, inst: Air.Inst.Index) !CValue {
if (f.liveness.isUnused(inst)) return CValue.none;
@@ -3183,6 +3185,11 @@ fn airWrapErrUnionErr(f: *Function, inst: Air.Inst.Index) !CValue {
return local;
}
fn airErrUnionPayloadPtrSet(f: *Function, inst: Air.Inst.Index) !CValue {
_ = inst;
return f.fail("TODO: C backend: implement airErrUnionPayloadPtrSet", .{});
}
fn airWrapErrUnionPay(f: *Function, inst: Air.Inst.Index) !CValue {
if (f.liveness.isUnused(inst))
return CValue.none;

32
src/codegen/llvm.zig
View File

@@ -2238,6 +2238,7 @@ pub const FuncGen = struct {
.unwrap_errunion_payload_ptr => try self.airErrUnionPayload(inst, true),
.unwrap_errunion_err => try self.airErrUnionErr(inst, false),
.unwrap_errunion_err_ptr => try self.airErrUnionErr(inst, true),
.errunion_payload_ptr_set => try self.airErrUnionPayloadPtrSet(inst),
.wrap_optional => try self.airWrapOptional(inst),
.wrap_errunion_payload => try self.airWrapErrUnionPayload(inst),
@@ -3202,6 +3203,37 @@ pub const FuncGen = struct {
return self.builder.buildExtractValue(operand, 0, "");
}
fn airErrUnionPayloadPtrSet(self: *FuncGen, inst: Air.Inst.Index) !?*const llvm.Value {
const ty_op = self.air.instructions.items(.data)[inst].ty_op;
const operand = try self.resolveInst(ty_op.operand);
const error_set_ty = self.air.typeOf(ty_op.operand).childType();
const error_ty = error_set_ty.errorUnionSet();
const payload_ty = error_set_ty.errorUnionPayload();
const non_error_val = try self.dg.genTypedValue(.{ .ty = error_ty, .val = Value.zero });
if (!payload_ty.hasRuntimeBits()) {
// We have a pointer to a i1. We need to set it to 1 and then return the same pointer.
_ = self.builder.buildStore(non_error_val, operand);
return operand;
}
const index_type = self.context.intType(32);
{
// First set the non-error value.
const indices: [2]*const llvm.Value = .{
index_type.constNull(), // dereference the pointer
index_type.constNull(), // first field is the payload
};
const non_null_ptr = self.builder.buildInBoundsGEP(operand, &indices, indices.len, "");
_ = self.builder.buildStore(non_error_val, non_null_ptr);
}
// Then return the payload pointer.
const indices: [2]*const llvm.Value = .{
index_type.constNull(), // dereference the pointer
index_type.constInt(1, .False), // second field is the payload
};
return self.builder.buildInBoundsGEP(operand, &indices, indices.len, "");
}
fn airWrapOptional(self: *FuncGen, inst: Air.Inst.Index) !?*const llvm.Value {
if (self.liveness.isUnused(inst)) return null;