334 lines
9.3 KiB
C
334 lines
9.3 KiB
C
/* go-type.h -- basic information for a Go type.
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Copyright 2009 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file. */
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#ifndef LIBGO_GO_TYPE_H
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#define LIBGO_GO_TYPE_H
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#include <stddef.h>
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#include <stdint.h>
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#include "go-string.h"
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#include "array.h"
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/* Many of the types in this file must match the data structures
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generated by the compiler, and must also match the Go types which
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appear in go/runtime/type.go and go/reflect/type.go. */
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/* Type kinds. These are used to get the type descriptor to use for
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the type itself, when using unsafe.Typeof or unsafe.Reflect. The
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values here must match the values generated by the compiler (the
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RUNTIME_TYPE_KIND_xxx values in gcc/go/types.h). These are macros
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rather than an enum to make it easy to change values in the future
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and hard to get confused about it.
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These correspond to the kind values used by the gc compiler. */
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#define GO_BOOL 1
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#define GO_INT 2
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#define GO_INT8 3
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#define GO_INT16 4
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#define GO_INT32 5
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#define GO_INT64 6
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#define GO_UINT 7
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#define GO_UINT8 8
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#define GO_UINT16 9
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#define GO_UINT32 10
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#define GO_UINT64 11
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#define GO_UINTPTR 12
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#define GO_FLOAT32 13
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#define GO_FLOAT64 14
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#define GO_COMPLEX64 15
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#define GO_COMPLEX128 16
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#define GO_ARRAY 17
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#define GO_CHAN 18
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#define GO_FUNC 19
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#define GO_INTERFACE 20
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#define GO_MAP 21
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#define GO_PTR 22
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#define GO_SLICE 23
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#define GO_STRING 24
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#define GO_STRUCT 25
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#define GO_UNSAFE_POINTER 26
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#define GO_NO_POINTERS (1 << 7)
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#define GO_CODE_MASK 0x7f
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/* For each Go type the compiler constructs one of these structures.
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This is used for type reflectin, interfaces, maps, and reference
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counting. */
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struct __go_type_descriptor
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{
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/* The type code for this type, one of the type kind values above.
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This is used by unsafe.Reflect and unsafe.Typeof to determine the
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type descriptor to return for this type itself. It is also used
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by reflect.toType when mapping to a reflect Type structure. */
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unsigned char __code;
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/* The alignment in bytes of a variable with this type. */
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unsigned char __align;
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/* The alignment in bytes of a struct field with this type. */
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unsigned char __field_align;
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/* The size in bytes of a value of this type. Note that all types
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in Go have a fixed size. */
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uintptr_t __size;
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/* The type's hash code. */
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uint32_t __hash;
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/* This function takes a pointer to a value of this type, and the
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size of this type, and returns a hash code. We pass the size
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explicitly becaues it means that we can share a single instance
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of this function for various different types. */
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uintptr_t (*__hashfn) (const void *, uintptr_t);
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/* This function takes two pointers to values of this type, and the
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size of this type, and returns whether the values are equal. */
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_Bool (*__equalfn) (const void *, const void *, uintptr_t);
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/* A string describing this type. This is only used for
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debugging. */
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const struct __go_string *__reflection;
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/* A pointer to fields which are only used for some types. */
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const struct __go_uncommon_type *__uncommon;
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/* The descriptor for the type which is a pointer to this type.
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This may be NULL. */
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const struct __go_type_descriptor *__pointer_to_this;
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};
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/* The information we store for each method of a type. */
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struct __go_method
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{
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/* The name of the method. */
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const struct __go_string *__name;
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/* This is NULL for an exported method, or the name of the package
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where it lives. */
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const struct __go_string *__pkg_path;
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/* The type of the method, without the receiver. This will be a
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function type. */
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const struct __go_type_descriptor *__mtype;
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/* The type of the method, with the receiver. This will be a
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function type. */
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const struct __go_type_descriptor *__type;
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/* A pointer to the code which implements the method. This is
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really a function pointer. */
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const void *__function;
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};
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/* Additional information that we keep for named types and for types
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with methods. */
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struct __go_uncommon_type
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{
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/* The name of the type. */
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const struct __go_string *__name;
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/* The type's package. This is NULL for builtin types. */
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const struct __go_string *__pkg_path;
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/* The type's methods. This is an array of struct __go_method. */
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struct __go_open_array __methods;
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};
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/* The type descriptor for a fixed array type. */
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struct __go_array_type
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{
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/* Starts like all type descriptors. */
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struct __go_type_descriptor __common;
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/* The element type. */
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struct __go_type_descriptor *__element_type;
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/* The type of a slice of the same element type. */
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struct __go_type_descriptor *__slice_type;
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/* The length of the array. */
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uintptr_t __len;
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};
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/* The type descriptor for a slice. */
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struct __go_slice_type
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{
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/* Starts like all other type descriptors. */
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struct __go_type_descriptor __common;
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/* The element type. */
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struct __go_type_descriptor *__element_type;
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};
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/* The direction of a channel. */
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#define CHANNEL_RECV_DIR 1
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#define CHANNEL_SEND_DIR 2
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#define CHANNEL_BOTH_DIR (CHANNEL_RECV_DIR | CHANNEL_SEND_DIR)
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/* The type descriptor for a channel. */
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struct __go_channel_type
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{
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/* Starts like all other type descriptors. */
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struct __go_type_descriptor __common;
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/* The element type. */
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const struct __go_type_descriptor *__element_type;
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/* The direction. */
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uintptr_t __dir;
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};
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/* The type descriptor for a function. */
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struct __go_func_type
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{
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/* Starts like all other type descriptors. */
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struct __go_type_descriptor __common;
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/* Whether this is a varargs function. If this is true, there will
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be at least one parameter. For "..." the last parameter type is
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"interface{}". For "... T" the last parameter type is "[]T". */
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_Bool __dotdotdot;
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/* The input parameter types. This is an array of pointers to
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struct __go_type_descriptor. */
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struct __go_open_array __in;
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/* The output parameter types. This is an array of pointers to
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struct __go_type_descriptor. */
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struct __go_open_array __out;
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};
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/* A method on an interface type. */
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struct __go_interface_method
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{
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/* The name of the method. */
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const struct __go_string *__name;
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/* This is NULL for an exported method, or the name of the package
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where it lives. */
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const struct __go_string *__pkg_path;
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/* The real type of the method. */
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struct __go_type_descriptor *__type;
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};
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/* An interface type. */
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struct __go_interface_type
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{
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/* Starts like all other type descriptors. */
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struct __go_type_descriptor __common;
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/* Array of __go_interface_method . The methods are sorted in the
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same order that they appear in the definition of the
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interface. */
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struct __go_open_array __methods;
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};
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/* A map type. */
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struct __go_map_type
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{
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/* Starts like all other type descriptors. */
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struct __go_type_descriptor __common;
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/* The map key type. */
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const struct __go_type_descriptor *__key_type;
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/* The map value type. */
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const struct __go_type_descriptor *__val_type;
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};
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/* A pointer type. */
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struct __go_ptr_type
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{
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/* Starts like all other type descriptors. */
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struct __go_type_descriptor __common;
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/* The type to which this points. */
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const struct __go_type_descriptor *__element_type;
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};
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/* A field in a structure. */
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struct __go_struct_field
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{
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/* The name of the field--NULL for an anonymous field. */
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const struct __go_string *__name;
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/* This is NULL for an exported method, or the name of the package
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where it lives. */
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const struct __go_string *__pkg_path;
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/* The type of the field. */
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const struct __go_type_descriptor *__type;
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/* The field tag, or NULL. */
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const struct __go_string *__tag;
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/* The offset of the field in the struct. */
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uintptr_t __offset;
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};
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/* A struct type. */
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struct __go_struct_type
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{
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/* Starts like all other type descriptors. */
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struct __go_type_descriptor __common;
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/* An array of struct __go_struct_field. */
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struct __go_open_array __fields;
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};
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/* If an empty interface has these bits set in its type pointer, it
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was copied from a reflect.Value and is not a valid empty
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interface. */
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enum
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{
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reflectFlags = 3,
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};
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/* Whether a type descriptor is a pointer. */
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static inline _Bool
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__go_is_pointer_type (const struct __go_type_descriptor *td)
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{
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return td->__code == GO_PTR || td->__code == GO_UNSAFE_POINTER;
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}
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extern _Bool
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__go_type_descriptors_equal(const struct __go_type_descriptor*,
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const struct __go_type_descriptor*);
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extern uintptr_t __go_type_hash_identity (const void *, uintptr_t);
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extern _Bool __go_type_equal_identity (const void *, const void *, uintptr_t);
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extern uintptr_t __go_type_hash_string (const void *, uintptr_t);
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extern _Bool __go_type_equal_string (const void *, const void *, uintptr_t);
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extern uintptr_t __go_type_hash_float (const void *, uintptr_t);
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extern _Bool __go_type_equal_float (const void *, const void *, uintptr_t);
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extern uintptr_t __go_type_hash_complex (const void *, uintptr_t);
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extern _Bool __go_type_equal_complex (const void *, const void *, uintptr_t);
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extern uintptr_t __go_type_hash_interface (const void *, uintptr_t);
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extern _Bool __go_type_equal_interface (const void *, const void *, uintptr_t);
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extern uintptr_t __go_type_hash_error (const void *, uintptr_t);
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extern _Bool __go_type_equal_error (const void *, const void *, uintptr_t);
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#endif /* !defined(LIBGO_GO_TYPE_H) */
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