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stage2: union field value

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This commit is contained in:
Robin Voetter
2021-10-20 02:23:09 +02:00
parent d6f048c456
commit 6329f4e47a
2 changed files with 53 additions and 24 deletions
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37
src/codegen/llvm.zig
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@@ -2236,17 +2236,34 @@ pub const FuncGen = struct {
const struct_field = self.air.extraData(Air.StructField, ty_pl.payload).data;
const struct_ty = self.air.typeOf(struct_field.struct_operand);
const struct_llvm_val = try self.resolveInst(struct_field.struct_operand);
const field_index = llvmFieldIndex(struct_ty, struct_field.field_index);
if (isByRef(struct_ty)) {
const field_ptr = self.builder.buildStructGEP(struct_llvm_val, field_index, "");
const field_ty = struct_ty.structFieldType(struct_field.field_index);
if (isByRef(field_ty)) {
return field_ptr;
} else {
return self.builder.buildLoad(field_ptr, "");
}
const field_index = struct_field.field_index;
const field_ty = struct_ty.structFieldType(field_index);
if (!field_ty.hasCodeGenBits()) {
return null;
}
assert(isByRef(struct_ty));
const field_ptr = switch (struct_ty.zigTypeTag()) {
.Struct => blk: {
const llvm_field_index = llvmFieldIndex(struct_ty, field_index);
break :blk self.builder.buildStructGEP(struct_llvm_val, llvm_field_index, "");
},
.Union => blk: {
const llvm_field_ty = try self.dg.llvmType(field_ty);
const target = self.dg.module.getTarget();
const layout = struct_ty.unionGetLayout(target);
const payload_index = @boolToInt(layout.tag_align >= layout.payload_align);
const union_field_ptr = self.builder.buildStructGEP(struct_llvm_val, payload_index, "");
break :blk self.builder.buildBitCast(union_field_ptr, llvm_field_ty.pointerType(0), "");
},
else => unreachable,
};
if (isByRef(field_ty)) {
return field_ptr;
} else {
return self.builder.buildExtractValue(struct_llvm_val, field_index, "");
return self.builder.buildLoad(field_ptr, "");
}
}