source: libcfa/src/concurrency/invoke.c @ 013b028

ADTarm-ehast-experimentalenumforall-pointer-decayjacob/cs343-translationnew-ast-unique-exprpthread-emulationqualifiedEnum
Last change on this file since 013b028 was 5715d43, checked in by Andrew Beach <ajbeach@…>, 4 years ago

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

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File size: 5.7 KB
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[8def349]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
[6b0b624]11// Last Modified By : Peter A. Buhr
[bede27b]12// Last Modified On : Fri Feb  9 16:37:42 2018
13// Update Count     : 5
[8def349]14//
[78b3f52]15
[2026bb6]16#define __cforall_thread__
17
[78b3f52]18#include <stdbool.h>
19#include <stdlib.h>
20#include <stdio.h>
[76e069f]21#include <unwind.h>
[78b3f52]22
23#include "invoke.h"
24
[5c81105]25#define __CFA_INVOKE_PRIVATE__
26#include "invoke.h"
[78b3f52]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.
[5c81105]30
[5715d43]31extern struct $coroutine * __cfactx_cor_active(void);
[ac2b598]32extern struct $coroutine * __cfactx_cor_finish(void);
33extern void __cfactx_cor_leave ( struct $coroutine * );
[c7a900a]34extern void __cfactx_thrd_leave();
35
[2026bb6]36extern void disable_interrupts() OPTIONAL_THREAD;
[36982fc]37extern void enable_interrupts( __cfaabi_dbg_ctx_param );
[78b3f52]38
[5715d43]39struct exception_context_t * this_exception_context() {
40        return &__get_stack( __cfactx_cor_active() )->exception_context;
41}
42
[c7a900a]43void __cfactx_invoke_coroutine(
[36982fc]44        void (*main)(void *),
45        void *this
[80d9e49]46) {
[09f357ec]47        // Finish setting up the coroutine by setting its state
[ac2b598]48        struct $coroutine * cor = __cfactx_cor_finish();
[78b3f52]49
[09f357ec]50        // Call the main of the coroutine
[36982fc]51        main( this );
[78b3f52]52
[36982fc]53        //Final suspend, should never return
[c7a900a]54        __cfactx_cor_leave( cor );
[169d944]55        __cabi_abort( "Resumed dead coroutine" );
[8118303]56}
57
[c7a900a]58static _Unwind_Reason_Code __cfactx_coroutine_unwindstop(
[76e069f]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,
[212c2187]64        void * param
[76e069f]65) {
66        if( actions & _UA_END_OF_STACK  ) {
67                // We finished unwinding the coroutine,
68                // leave it
[c7a900a]69                __cfactx_cor_leave( param );
[76e069f]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
[ac2b598]77void __cfactx_coroutine_unwind(struct _Unwind_Exception * storage, struct $coroutine * cor) __attribute__ ((__noreturn__));
78void __cfactx_coroutine_unwind(struct _Unwind_Exception * storage, struct $coroutine * cor) {
[c7a900a]79        _Unwind_Reason_Code ret = _Unwind_ForcedUnwind( storage, __cfactx_coroutine_unwindstop, cor );
[76e069f]80        printf("UNWIND ERROR %d after force unwind\n", ret);
81        abort();
82}
83
[c7a900a]84void __cfactx_invoke_thread(
[36982fc]85        void (*main)(void *),
86        void *this
[8118303]87) {
[36982fc]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
[c7a900a]101        __cfactx_thrd_leave();
[169d944]102        __cabi_abort( "Resumed dead thread" );
[78b3f52]103}
104
[c7a900a]105void __cfactx_start(
[36982fc]106        void (*main)(void *),
[ac2b598]107        struct $coroutine * cor,
[36982fc]108        void *this,
109        void (*invoke)(void *)
[80d9e49]110) {
[b2f6113]111        struct __stack_t * stack = cor->stack.storage;
[78b3f52]112
[381fdee]113#if defined( __i386 )
[d9c44c3]114
115        struct FakeStack {
[b78129a]116            void *fixedRegisters[3];              // fixed registers ebx, edi, esi (popped on 1st uSwitch, values unimportant)
[17af7d1]117            void *rturn;                          // where to go on return from uSwitch
[b78129a]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
[d9c44c3]121        };
122
[b2f6113]123        cor->context.SP = (char *)stack->base - sizeof( struct FakeStack );
124        cor->context.FP = NULL;         // terminate stack with NULL fp
[d9c44c3]125
[b2f6113]126        struct FakeStack *fs = (struct FakeStack *)cor->context.SP;
127
128        fs->dummyReturn = NULL;
[09f357ec]129        fs->argument[0] = main;     // argument to invoke
130        fs->argument[1] = this;     // argument to invoke
[b2f6113]131        fs->rturn = invoke;
[d9c44c3]132
[381fdee]133#elif defined( __x86_64 )
[d9c44c3]134
[36982fc]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
[b2f6113]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;
[36982fc]145
[b2f6113]146        fs->dummyReturn = NULL;
[c7a900a]147        fs->rturn = __cfactx_invoke_stub;
[09f357ec]148        fs->fixedRegisters[0] = main;
149        fs->fixedRegisters[1] = this;
150        fs->fixedRegisters[2] = invoke;
[b158d8f]151
152#elif defined( __ARM_ARCH )
[129674b]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
[b158d8f]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
[b2f6113]168        cor->context.SP = (char *)stack->base - sizeof( struct FakeStack );
169        cor->context.FP = NULL;
[b158d8f]170
[b2f6113]171        struct FakeStack *fs = (struct FakeStack *)cor->context.SP;
[b158d8f]172
[c7a900a]173        fs->intRegs[8] = __cfactx_invoke_stub;
[b158d8f]174        fs->arg[0] = this;
175        fs->arg[1] = invoke;
[381fdee]176
[d9c44c3]177#else
[381fdee]178        #error uknown hardware architecture
[d9c44c3]179#endif
[e4745d7a]180}
[6b0b624]181
182// Local Variables: //
183// mode: c //
184// tab-width: 4 //
185// End: //
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