source: libcfa/src/exception.h

Last change on this file was 8f910430, checked in by Andrew Beach <ajbeach@…>, 7 months ago

Updated the virtual module to prefix the names with the new convention and change the parent_vtable into type_info.

  • Property mode set to 100644
File size: 4.6 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// exception.h -- Internal exception handling definitions.
8//
9// Author           : Andrew Beach
10// Created On       : Mon Jun 26 15:11:00 2017
11// Last Modified By : Andrew Beach
12// Last Modified On : Thr Apr  8 15:20:00 2021
13// Update Count     : 12
14//
15
16#pragma once
17
18// This could be considered several headers. All are internal to the exception
19// system but needed to depending on whether they are C/Cforall code and
20// whether or not they are part of the builtins.
21
22#ifdef __cforall
23extern "C" {
24#endif
25
26// Included in C code or the built-ins.
27#if !defined(__cforall) || defined(__cforall_builtins__)
28
29struct __cfaehm_base_exception_t;
30typedef struct __cfaehm_base_exception_t exception_t;
31struct __cfavir_type_info;
32struct __cfaehm_base_exception_t_vtable {
33        const struct __cfavir_type_info * __cfavir_typeid;
34        size_t size;
35        void (*copy)(struct __cfaehm_base_exception_t *this,
36                     struct __cfaehm_base_exception_t * other);
37        void (*free)(struct __cfaehm_base_exception_t *this);
38        const char * (*msg)(struct __cfaehm_base_exception_t *this);
39};
40struct __cfaehm_base_exception_t {
41        struct __cfaehm_base_exception_t_vtable const * virtual_table;
42};
43extern struct __cfavir_type_info __cfatid_exception_t;
44
45
46void __cfaehm_cancel_stack(exception_t * except) __attribute__((noreturn));
47
48// Used in throw statement translation.
49void __cfaehm_throw_terminate(exception_t * except, void (*)(exception_t *));
50void __cfaehm_rethrow_terminate() __attribute__((noreturn));
51void __cfaehm_throw_resume(exception_t * except, void (*)(exception_t *));
52
53// Function catches termination exceptions.
54void __cfaehm_try_terminate(
55        void (*try_block)(),
56        void (*catch_block)(int index, exception_t * except),
57        int (*match_block)(exception_t * except));
58
59// Clean-up the exception in catch blocks.
60void __cfaehm_cleanup_terminate(void * except);
61
62// Data structure creates a list of resume handlers.
63struct __cfaehm_try_resume_node {
64        struct __cfaehm_try_resume_node * next;
65        _Bool (*handler)(exception_t * except);
66};
67
68// These act as constructor and destructor for the resume node.
69void __cfaehm_try_resume_setup(
70        struct __cfaehm_try_resume_node * node,
71        _Bool (*handler)(exception_t * except));
72void __cfaehm_try_resume_cleanup(
73        struct __cfaehm_try_resume_node * node);
74
75// Check for a standard way to call fake deconstructors.
76struct __cfaehm_cleanup_hook {};
77
78#endif
79
80// Included in C code and the library.
81#if !defined(__cforall) || !defined(__cforall_builtins__)
82struct __cfaehm_node {
83        struct _Unwind_Exception unwind_exception;
84        struct __cfaehm_node * next;
85        int handler_index;
86};
87
88static inline exception_t * __cfaehm_cancellation_exception(
89                struct _Unwind_Exception * unwind_exception ) {
90        return (exception_t *)(1 + (struct __cfaehm_node *)unwind_exception);
91}
92#endif
93
94#ifdef __cforall
95}
96
97// Built-ins not visible in C.
98#if defined(__cforall_builtins__)
99
100// Not all the built-ins can be expressed in C. These can't be
101// implemented in the .c file either so they all have to be inline.
102
103trait is_exception(exceptT &, virtualT &) {
104        /* The first field must be a pointer to a virtual table.
105         * That virtual table must be a decendent of the base exception virtual table.
106         * The virtual table must point at the prober type-id.
107         * None of these can be enforced in an assertion.
108         */
109};
110
111trait is_termination_exception(exceptT &, virtualT & | is_exception(exceptT, virtualT)) {
112        void defaultTerminationHandler(exceptT &);
113};
114
115trait is_resumption_exception(exceptT &, virtualT & | is_exception(exceptT, virtualT)) {
116        void defaultResumptionHandler(exceptT &);
117};
118
119forall(exceptT &, virtualT & | is_termination_exception(exceptT, virtualT))
120static inline void $throw(exceptT & except) {
121        __cfaehm_throw_terminate(
122                (exception_t *)&except,
123                (void(*)(exception_t *))defaultTerminationHandler
124        );
125}
126
127forall(exceptT &, virtualT & | is_resumption_exception(exceptT, virtualT))
128static inline void $throwResume(exceptT & except) {
129        __cfaehm_throw_resume(
130                (exception_t *)&except,
131                (void(*)(exception_t *))defaultResumptionHandler
132        );
133}
134
135forall(exceptT &, virtualT & | is_exception(exceptT, virtualT))
136static inline void cancel_stack(exceptT & except) __attribute__((noreturn)) {
137        __cfaehm_cancel_stack( (exception_t *)&except );
138}
139
140forall(exceptT &, virtualT & | is_exception(exceptT, virtualT))
141static inline void defaultTerminationHandler(exceptT & except) {
142        return cancel_stack( except );
143}
144
145forall(exceptT &, virtualT & | is_exception(exceptT, virtualT))
146static inline void defaultResumptionHandler(exceptT & except) {
147        throw except;
148}
149
150#endif
151
152#endif
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