add int_type builtin function

src/all_types.hpp

@@ -1139,6 +1139,7 @@ enum BuiltinFnId {
     BuiltinFnIdFence,
     BuiltinFnIdDivExact,
     BuiltinFnIdTruncate,
+    BuiltinFnIdIntType,
 };
 
 struct BuiltinFnEntry {

src/analyze.cpp

@@ -4790,6 +4790,52 @@ static TypeTableEntry *analyze_compile_err(CodeGen *g, ImportTableEntry *import,
     return g->builtin_types.entry_invalid;
 }
 
+static TypeTableEntry *analyze_int_type(CodeGen *g, ImportTableEntry *import,
+        BlockContext *context, AstNode *node)
+{
+    AstNode **is_signed_node = &node->data.fn_call_expr.params.at(0);
+    AstNode **bit_count_node = &node->data.fn_call_expr.params.at(1);
+    AstNode **is_wrap_node = &node->data.fn_call_expr.params.at(2);
+
+    TypeTableEntry *bool_type = g->builtin_types.entry_bool;
+    TypeTableEntry *usize_type = g->builtin_types.entry_usize;
+    TypeTableEntry *is_signed_type = analyze_expression(g, import, context, bool_type, *is_signed_node);
+    TypeTableEntry *bit_count_type = analyze_expression(g, import, context, usize_type, *bit_count_node);
+    TypeTableEntry *is_wrap_type = analyze_expression(g, import, context, bool_type, *is_wrap_node);
+
+    if (is_signed_type->id == TypeTableEntryIdInvalid ||
+        bit_count_type->id == TypeTableEntryIdInvalid ||
+        is_wrap_type->id == TypeTableEntryIdInvalid)
+    {
+        return g->builtin_types.entry_invalid;
+    }
+
+    ConstExprValue *is_signed_val = &get_resolved_expr(*is_signed_node)->const_val;
+    ConstExprValue *bit_count_val = &get_resolved_expr(*bit_count_node)->const_val;
+    ConstExprValue *is_wrap_val = &get_resolved_expr(*is_wrap_node)->const_val;
+
+    AstNode *bad_node = nullptr;
+    if (!is_signed_val->ok) {
+        bad_node = *is_signed_node;
+    } else if (!bit_count_val->ok) {
+        bad_node = *bit_count_node;
+    } else if (!is_wrap_val->ok) {
+        bad_node = *is_wrap_node;
+    }
+    if (bad_node) {
+        add_node_error(g, bad_node, buf_sprintf("unable to evaluate constant expression"));
+        return g->builtin_types.entry_invalid;
+    }
+
+    bool depends_on_compile_var = is_signed_val->depends_on_compile_var ||
+        bit_count_val->depends_on_compile_var || is_wrap_val->depends_on_compile_var;
+
+    TypeTableEntry *int_type = get_int_type(g, is_signed_val->data.x_bool, is_wrap_val->data.x_bool,
+            bit_count_val->data.x_bignum.data.x_uint);
+    return resolve_expr_const_val_as_type(g, node, int_type, depends_on_compile_var);
+
+}
+
 static TypeTableEntry *analyze_builtin_fn_call_expr(CodeGen *g, ImportTableEntry *import, BlockContext *context,
         TypeTableEntry *expected_type, AstNode *node)
 {
@@ -5136,6 +5182,8 @@ static TypeTableEntry *analyze_builtin_fn_call_expr(CodeGen *g, ImportTableEntry
             return analyze_truncate(g, import, context, node);
         case BuiltinFnIdCompileErr:
             return analyze_compile_err(g, import, context, node);
+        case BuiltinFnIdIntType:
+            return analyze_int_type(g, import, context, node);
     }
     zig_unreachable();
 }

src/codegen.cpp

@@ -540,6 +540,7 @@ static LLVMValueRef gen_builtin_fn_call_expr(CodeGen *g, AstNode *node) {
         case BuiltinFnIdImport:
         case BuiltinFnIdCImport:
         case BuiltinFnIdCompileErr:
+        case BuiltinFnIdIntType:
             zig_unreachable();
         case BuiltinFnIdCtz:
         case BuiltinFnIdClz:
@@ -4657,6 +4658,7 @@ static void define_builtin_fns(CodeGen *g) {
     create_builtin_fn_with_arg_count(g, BuiltinFnIdDivExact, "div_exact", 2);
     create_builtin_fn_with_arg_count(g, BuiltinFnIdTruncate, "truncate", 2);
     create_builtin_fn_with_arg_count(g, BuiltinFnIdCompileErr, "compile_err", 1);
+    create_builtin_fn_with_arg_count(g, BuiltinFnIdIntType, "int_type", 3);
 }
 
 static void init(CodeGen *g, Buf *source_path) {

src/eval.cpp

@@ -834,6 +834,7 @@ static bool eval_fn_call_builtin(EvalFn *ef, AstNode *node, ConstExprValue *out_
         case BuiltinFnIdFrameAddress:
         case BuiltinFnIdReturnAddress:
         case BuiltinFnIdCompileErr:
+        case BuiltinFnIdIntType:
             zig_unreachable();
     }
 

test/self_hosted.zig

@@ -1689,3 +1689,26 @@ struct DivResult {
     quotient: u64,
     remainder: u64,
 }
+
+#attribute("test")
+fn int_type_builtin() {
+    assert(@int_type(true, 8, false) == i8);
+    assert(@int_type(true, 16, false) == i16);
+    assert(@int_type(true, 32, false) == i32);
+    assert(@int_type(true, 64, false) == i64);
+
+    assert(@int_type(false, 8, false) == u8);
+    assert(@int_type(false, 16, false) == u16);
+    assert(@int_type(false, 32, false) == u32);
+    assert(@int_type(false, 64, false) == u64);
+
+    assert(@int_type(true, 8, true) == i8w);
+    assert(@int_type(true, 16, true) == i16w);
+    assert(@int_type(true, 32, true) == i32w);
+    assert(@int_type(true, 64, true) == i64w);
+
+    assert(@int_type(false, 8, true) == u8w);
+    assert(@int_type(false, 16, true) == u16w);
+    assert(@int_type(false, 32, true) == u32w);
+    assert(@int_type(false, 64, true) == u64w);
+}