source: libcfa/src/concurrency/invoke.c@ 5715d43

ADT arm-eh ast-experimental enum forall-pointer-decay jacob/cs343-translation new-ast new-ast-unique-expr pthread-emulation qualifiedEnum
Last change on this file since 5715d43 was 5715d43, checked in by Andrew Beach <ajbeach@…>, 5 years ago

Exceptions now get their context differently with libcfathread. Added a number of tests to help test this.

  • Property mode set to 100644
File size: 5.7 KB
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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// invoke.c --
8//
9// Author : Thierry Delisle
10// Created On : Tue Jan 17 12:27:26 2016
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Fri Feb 9 16:37:42 2018
13// Update Count : 5
14//
15
16#define __cforall_thread__
17
18#include <stdbool.h>
19#include <stdlib.h>
20#include <stdio.h>
21#include <unwind.h>
22
23#include "invoke.h"
24
25#define __CFA_INVOKE_PRIVATE__
26#include "invoke.h"
27
28// magically invoke the "main" of the most derived class
29// Called from the kernel when starting a coroutine or task so must switch back to user mode.
30
31extern struct $coroutine * __cfactx_cor_active(void);
32extern struct $coroutine * __cfactx_cor_finish(void);
33extern void __cfactx_cor_leave ( struct $coroutine * );
34extern void __cfactx_thrd_leave();
35
36extern void disable_interrupts() OPTIONAL_THREAD;
37extern void enable_interrupts( __cfaabi_dbg_ctx_param );
38
39struct exception_context_t * this_exception_context() {
40 return &__get_stack( __cfactx_cor_active() )->exception_context;
41}
42
43void __cfactx_invoke_coroutine(
44 void (*main)(void *),
45 void *this
46) {
47 // Finish setting up the coroutine by setting its state
48 struct $coroutine * cor = __cfactx_cor_finish();
49
50 // Call the main of the coroutine
51 main( this );
52
53 //Final suspend, should never return
54 __cfactx_cor_leave( cor );
55 __cabi_abort( "Resumed dead coroutine" );
56}
57
58static _Unwind_Reason_Code __cfactx_coroutine_unwindstop(
59 __attribute((__unused__)) int version,
60 _Unwind_Action actions,
61 __attribute((__unused__)) _Unwind_Exception_Class exceptionClass,
62 __attribute((__unused__)) struct _Unwind_Exception * unwind_exception,
63 __attribute((__unused__)) struct _Unwind_Context * context,
64 void * param
65) {
66 if( actions & _UA_END_OF_STACK ) {
67 // We finished unwinding the coroutine,
68 // leave it
69 __cfactx_cor_leave( param );
70 __cabi_abort( "Resumed dead coroutine" );
71 }
72 if( actions & _UA_CLEANUP_PHASE ) return _URC_NO_REASON;
73
74 return _URC_FATAL_PHASE2_ERROR;
75}
76
77void __cfactx_coroutine_unwind(struct _Unwind_Exception * storage, struct $coroutine * cor) __attribute__ ((__noreturn__));
78void __cfactx_coroutine_unwind(struct _Unwind_Exception * storage, struct $coroutine * cor) {
79 _Unwind_Reason_Code ret = _Unwind_ForcedUnwind( storage, __cfactx_coroutine_unwindstop, cor );
80 printf("UNWIND ERROR %d after force unwind\n", ret);
81 abort();
82}
83
84void __cfactx_invoke_thread(
85 void (*main)(void *),
86 void *this
87) {
88 // Officially start the thread by enabling preemption
89 enable_interrupts( __cfaabi_dbg_ctx );
90
91 // Call the main of the thread
92 main( this );
93
94 // To exit a thread we must :
95 // 1 - Mark it as halted
96 // 2 - Leave its monitor
97 // 3 - Disable the interupts
98 // 4 - Final suspend
99 // The order of these 4 operations is very important
100 //Final suspend, should never return
101 __cfactx_thrd_leave();
102 __cabi_abort( "Resumed dead thread" );
103}
104
105void __cfactx_start(
106 void (*main)(void *),
107 struct $coroutine * cor,
108 void *this,
109 void (*invoke)(void *)
110) {
111 struct __stack_t * stack = cor->stack.storage;
112
113#if defined( __i386 )
114
115 struct FakeStack {
116 void *fixedRegisters[3]; // fixed registers ebx, edi, esi (popped on 1st uSwitch, values unimportant)
117 void *rturn; // where to go on return from uSwitch
118 void *dummyReturn; // fake return compiler would have pushed on call to uInvoke
119 void *argument[3]; // for 16-byte ABI, 16-byte alignment starts here
120 void *padding; // padding to force 16-byte alignment, as "base" is 16-byte aligned
121 };
122
123 cor->context.SP = (char *)stack->base - sizeof( struct FakeStack );
124 cor->context.FP = NULL; // terminate stack with NULL fp
125
126 struct FakeStack *fs = (struct FakeStack *)cor->context.SP;
127
128 fs->dummyReturn = NULL;
129 fs->argument[0] = main; // argument to invoke
130 fs->argument[1] = this; // argument to invoke
131 fs->rturn = invoke;
132
133#elif defined( __x86_64 )
134
135 struct FakeStack {
136 void *fixedRegisters[5]; // fixed registers rbx, r12, r13, r14, r15
137 void *rturn; // where to go on return from uSwitch
138 void *dummyReturn; // NULL return address to provide proper alignment
139 };
140
141 cor->context.SP = (char *)stack->base - sizeof( struct FakeStack );
142 cor->context.FP = NULL; // terminate stack with NULL fp
143
144 struct FakeStack *fs = (struct FakeStack *)cor->context.SP;
145
146 fs->dummyReturn = NULL;
147 fs->rturn = __cfactx_invoke_stub;
148 fs->fixedRegisters[0] = main;
149 fs->fixedRegisters[1] = this;
150 fs->fixedRegisters[2] = invoke;
151
152#elif defined( __ARM_ARCH )
153#error ARM needs to be upgrade to use two parameters like X86/X64 (A.K.A. : I broke this and do not know how to fix it)
154 // More details about the error:
155 // To avoid the thunk problem, I changed the invoke routine to pass the main explicitly
156 // instead of relying on an assertion. This effectively hoists any required thunk one level
157 // which was enough to get to global scope in most cases.
158 // This means that __cfactx_invoke_... now takes two parameters and the FakeStack needs
159 // to be adjusted as a consequence of that.
160 // I don't know how to do that for ARM, hence the #error
161
162 struct FakeStack {
163 float fpRegs[16]; // floating point registers
164 void *intRegs[9]; // integer/pointer registers
165 void *arg[2]; // placeholder for this pointer
166 };
167
168 cor->context.SP = (char *)stack->base - sizeof( struct FakeStack );
169 cor->context.FP = NULL;
170
171 struct FakeStack *fs = (struct FakeStack *)cor->context.SP;
172
173 fs->intRegs[8] = __cfactx_invoke_stub;
174 fs->arg[0] = this;
175 fs->arg[1] = invoke;
176
177#else
178 #error uknown hardware architecture
179#endif
180}
181
182// Local Variables: //
183// mode: c //
184// tab-width: 4 //
185// End: //
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