Implement bitfield

TODOLIST

@@ -1,3 +1,3 @@
-struct
+bitstruct
 c abi
 for loops

bootstrap/backend/llvm_bindings.zig

@@ -37,6 +37,7 @@ pub extern fn NativityLLVMDebugInfoBuilderCreateEnumerationType(builder: *LLVM.D
 pub extern fn NativityLLVMDebugInfoBuilderCreateEnumerator(builder: *LLVM.DebugInfo.Builder, name_ptr: [*]const u8, name_len: usize, value: u64, is_unsigned: bool) *LLVM.DebugInfo.Type.Enumerator;
 pub extern fn NativityLLVMDebugInfoBuilderCreateReplaceableCompositeType(builder: *LLVM.DebugInfo.Builder, tag: c_uint, name_ptr: [*]const u8, name_len: usize, scope: ?*LLVM.DebugInfo.Scope, file: ?*LLVM.DebugInfo.File, line: c_uint) *LLVM.DebugInfo.Type.Composite;
 pub extern fn NativityLLVMDebugInfoBuilderCreateMemberType(builder: *LLVM.DebugInfo.Builder, scope: ?*LLVM.DebugInfo.Scope, name_ptr: [*]const u8, name_len: usize, file: ?*LLVM.DebugInfo.File, line_number: c_uint, bit_size: u64, alignment: u32, bit_offset: u64, flags: LLVM.DebugInfo.Node.Flags, type: *LLVM.DebugInfo.Type) *LLVM.DebugInfo.Type.Derived;
+pub extern fn NativityLLVMDebugInfoBuilderCreateBitfieldMemberType(builder: *LLVM.DebugInfo.Builder, scope: *LLVM.DebugInfo.Scope, name_pointer: [*]const u8, name_len: usize, file: *LLVM.DebugInfo.File, line_number: c_uint, bit_size: u64, bit_offset: u64, storage_bit_offset: u64, flags: LLVM.DebugInfo.Node.Flags, type: *LLVM.DebugInfo.Type) *LLVM.DebugInfo.Type.Derived;
 pub extern fn NativityLLVMDebugInfoBuilderCompositeTypeReplaceTypes(builder: *LLVM.DebugInfo.Builder, type: *LLVM.DebugInfo.Type.Composite, element_type_ptr: [*]const *LLVM.DebugInfo.Type, element_type_count: usize) void;
 pub extern fn NativityLLLVMDITypeIsResolved(type: *LLVM.DebugInfo.Type) bool;
 pub extern fn NativityLLVMDebugInfoBuilderFinalizeSubprogram(builder: *LLVM.DebugInfo.Builder, subprogram: *LLVM.DebugInfo.Subprogram, function: *LLVM.Value.Constant.Function) void;

retest/standalone/bitfield/main.nat

@@ -0,0 +1,25 @@
+bitfield(s32) Bitfield{
+    a: u1,
+    b: u1,
+    c: u1,
+    d: u29,
+}
+
+fn[cc(.c)] main[export]() s32 {
+    >bf: Bitfield = {
+        .a = 0,
+        .b = 1,
+        .c = 1,
+        .d = 0,
+    };
+    >bf_int: s32 = #transmute(bf);
+
+    >bf_int2: s32 = 6;
+    >bf2: Bitfield = #transmute(bf_int2);
+    #assert(bf.a == bf2.a);
+    #assert(bf.b == bf2.b);
+    #assert(bf.c == bf2.c);
+    #assert(bf.d == bf2.d);
+    
+    return bf_int - bf_int2;
+}

src/llvm/llvm.cpp

@@ -234,6 +234,13 @@ extern "C" DIDerivedType* NativityLLVMDebugInfoBuilderCreateMemberType(DIBuilder
     return member_type;
 }
 
+extern "C" DIDerivedType* NativityLLVMDebugInfoBuilderCreateBitfieldMemberType(DIBuilder& builder, DIScope *scope, const char* name_ptr, size_t name_len, DIFile* file, unsigned line_number, uint64_t bit_size, uint64_t bit_offset, uint64_t storage_bit_offset, DINode::DIFlags flags, DIType* type)
+{
+    auto name = StringRef(name_ptr, name_len);
+    auto* member_type = builder.createBitFieldMemberType(scope, name, file, line_number, bit_size, bit_offset, storage_bit_offset, flags, type);
+    return member_type;
+}
+
 extern "C" bool NativityLLLVMDITypeIsResolved(DIType* type)
 {
     return type->isResolved();