1 /* go-type.h -- basic information for a Go type.
3 Copyright 2009 The Go Authors. All rights reserved.
4 Use of this source code is governed by a BSD-style
5 license that can be found in the LICENSE file. */
7 #ifndef LIBGO_GO_TYPE_H
8 #define LIBGO_GO_TYPE_H
17 /* Many of the types in this file must match the data structures
18 generated by the compiler, and must also match the Go types which
19 appear in go/runtime/type.go and go/reflect/type.go. */
21 /* Type kinds. These are used to get the type descriptor to use for
22 the type itself, when using unsafe.Typeof or unsafe.Reflect. The
23 values here must match the values generated by the compiler (the
24 RUNTIME_TYPE_KIND_xxx values in gcc/go/types.h). These are macros
25 rather than an enum to make it easy to change values in the future
26 and hard to get confused about it.
28 These correspond to the kind values used by the gc compiler. */
44 #define GO_COMPLEX64 15
45 #define GO_COMPLEX128 16
49 #define GO_INTERFACE 20
55 #define GO_UNSAFE_POINTER 26
57 #define GO_NO_POINTERS (1 << 7)
59 #define GO_CODE_MASK 0x7f
61 /* For each Go type the compiler constructs one of these structures.
62 This is used for type reflectin, interfaces, maps, and reference
65 struct __go_type_descriptor
67 /* The type code for this type, one of the type kind values above.
68 This is used by unsafe.Reflect and unsafe.Typeof to determine the
69 type descriptor to return for this type itself. It is also used
70 by reflect.toType when mapping to a reflect Type structure. */
73 /* The alignment in bytes of a variable with this type. */
74 unsigned char __align
;
76 /* The alignment in bytes of a struct field with this type. */
77 unsigned char __field_align
;
79 /* The size in bytes of a value of this type. Note that all types
80 in Go have a fixed size. */
83 /* The type's hash code. */
86 /* This function takes a pointer to a value of this type, and the
87 size of this type, and returns a hash code. We pass the size
88 explicitly becaues it means that we can share a single instance
89 of this function for various different types. */
90 uintptr_t (*__hashfn
) (const void *, uintptr_t);
92 /* This function takes two pointers to values of this type, and the
93 size of this type, and returns whether the values are equal. */
94 _Bool (*__equalfn
) (const void *, const void *, uintptr_t);
96 /* A string describing this type. This is only used for
98 const struct String
*__reflection
;
100 /* A pointer to fields which are only used for some types. */
101 const struct __go_uncommon_type
*__uncommon
;
103 /* The descriptor for the type which is a pointer to this type.
105 const struct __go_type_descriptor
*__pointer_to_this
;
108 /* The information we store for each method of a type. */
112 /* The name of the method. */
113 const struct String
*__name
;
115 /* This is NULL for an exported method, or the name of the package
117 const struct String
*__pkg_path
;
119 /* The type of the method, without the receiver. This will be a
121 const struct __go_type_descriptor
*__mtype
;
123 /* The type of the method, with the receiver. This will be a
125 const struct __go_type_descriptor
*__type
;
127 /* A pointer to the code which implements the method. This is
128 really a function pointer. */
129 const void *__function
;
132 /* Additional information that we keep for named types and for types
135 struct __go_uncommon_type
137 /* The name of the type. */
138 const struct String
*__name
;
140 /* The type's package. This is NULL for builtin types. */
141 const struct String
*__pkg_path
;
143 /* The type's methods. This is an array of struct __go_method. */
144 struct __go_open_array __methods
;
147 /* The type descriptor for a fixed array type. */
149 struct __go_array_type
151 /* Starts like all type descriptors. */
152 struct __go_type_descriptor __common
;
154 /* The element type. */
155 struct __go_type_descriptor
*__element_type
;
157 /* The type of a slice of the same element type. */
158 struct __go_type_descriptor
*__slice_type
;
160 /* The length of the array. */
164 /* The type descriptor for a slice. */
166 struct __go_slice_type
168 /* Starts like all other type descriptors. */
169 struct __go_type_descriptor __common
;
171 /* The element type. */
172 struct __go_type_descriptor
*__element_type
;
175 /* The direction of a channel. */
176 #define CHANNEL_RECV_DIR 1
177 #define CHANNEL_SEND_DIR 2
178 #define CHANNEL_BOTH_DIR (CHANNEL_RECV_DIR | CHANNEL_SEND_DIR)
180 /* The type descriptor for a channel. */
182 struct __go_channel_type
184 /* Starts like all other type descriptors. */
185 struct __go_type_descriptor __common
;
187 /* The element type. */
188 const struct __go_type_descriptor
*__element_type
;
194 /* The type descriptor for a function. */
196 struct __go_func_type
198 /* Starts like all other type descriptors. */
199 struct __go_type_descriptor __common
;
201 /* Whether this is a varargs function. If this is true, there will
202 be at least one parameter. For "..." the last parameter type is
203 "interface{}". For "... T" the last parameter type is "[]T". */
206 /* The input parameter types. This is an array of pointers to
207 struct __go_type_descriptor. */
208 struct __go_open_array __in
;
210 /* The output parameter types. This is an array of pointers to
211 struct __go_type_descriptor. */
212 struct __go_open_array __out
;
215 /* A method on an interface type. */
217 struct __go_interface_method
219 /* The name of the method. */
220 const struct String
*__name
;
222 /* This is NULL for an exported method, or the name of the package
224 const struct String
*__pkg_path
;
226 /* The real type of the method. */
227 struct __go_type_descriptor
*__type
;
230 /* An interface type. */
232 struct __go_interface_type
234 /* Starts like all other type descriptors. */
235 struct __go_type_descriptor __common
;
237 /* Array of __go_interface_method . The methods are sorted in the
238 same order that they appear in the definition of the
240 struct __go_open_array __methods
;
247 /* Starts like all other type descriptors. */
248 struct __go_type_descriptor __common
;
250 /* The map key type. */
251 const struct __go_type_descriptor
*__key_type
;
253 /* The map value type. */
254 const struct __go_type_descriptor
*__val_type
;
257 /* A pointer type. */
261 /* Starts like all other type descriptors. */
262 struct __go_type_descriptor __common
;
264 /* The type to which this points. */
265 const struct __go_type_descriptor
*__element_type
;
268 /* A field in a structure. */
270 struct __go_struct_field
272 /* The name of the field--NULL for an anonymous field. */
273 const struct String
*__name
;
275 /* This is NULL for an exported method, or the name of the package
277 const struct String
*__pkg_path
;
279 /* The type of the field. */
280 const struct __go_type_descriptor
*__type
;
282 /* The field tag, or NULL. */
283 const struct String
*__tag
;
285 /* The offset of the field in the struct. */
291 struct __go_struct_type
293 /* Starts like all other type descriptors. */
294 struct __go_type_descriptor __common
;
296 /* An array of struct __go_struct_field. */
297 struct __go_open_array __fields
;
300 /* If an empty interface has these bits set in its type pointer, it
301 was copied from a reflect.Value and is not a valid empty
309 /* Whether a type descriptor is a pointer. */
312 __go_is_pointer_type (const struct __go_type_descriptor
*td
)
314 return td
->__code
== GO_PTR
|| td
->__code
== GO_UNSAFE_POINTER
;
318 __go_type_descriptors_equal(const struct __go_type_descriptor
*,
319 const struct __go_type_descriptor
*);
321 extern uintptr_t __go_type_hash_identity (const void *, uintptr_t);
322 extern _Bool
__go_type_equal_identity (const void *, const void *, uintptr_t);
323 extern uintptr_t __go_type_hash_string (const void *, uintptr_t);
324 extern _Bool
__go_type_equal_string (const void *, const void *, uintptr_t);
325 extern uintptr_t __go_type_hash_float (const void *, uintptr_t);
326 extern _Bool
__go_type_equal_float (const void *, const void *, uintptr_t);
327 extern uintptr_t __go_type_hash_complex (const void *, uintptr_t);
328 extern _Bool
__go_type_equal_complex (const void *, const void *, uintptr_t);
329 extern uintptr_t __go_type_hash_interface (const void *, uintptr_t);
330 extern _Bool
__go_type_equal_interface (const void *, const void *, uintptr_t);
331 extern uintptr_t __go_type_hash_error (const void *, uintptr_t);
332 extern _Bool
__go_type_equal_error (const void *, const void *, uintptr_t);
334 #endif /* !defined(LIBGO_GO_TYPE_H) */