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af72d01de8
This patch is a bit unfortunate, in the sense that it exposes some of the JIT guts to the rest of the VM. Code needs to treat "machine return addresses" as valid if non-NULL (as before) and also not equal to a tier-down trampoline. This is because tier-down at a return needs the old frame pointer to load the "virtual return address", and the way this patch works is that it passes the vra in a well-known register. It's a custom calling convention for a certain kind of return. * libguile/jit.h (scm_jit_return_to_interpreter_trampoline): New internal global. * libguile/jit.c: (scm_jit_clear_mcode_return_addresses): Move here, from vm.c. Instead of zeroing return addresses, set them to the return-to-interpreter trampoline. * libguile/vm-engine.c (return-values): Don't enter mcode if the mra is scm_jit_return_to_interpreter_trampoline. * libguile/vm.c (capture_continuation): Treat the tier-down trampoline as NULL.
70 lines
2 KiB
C
70 lines
2 KiB
C
#ifndef SCM_JIT_H
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#define SCM_JIT_H
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/* Copyright 2018-2019
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Free Software Foundation, Inc.
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This file is part of Guile.
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Guile is free software: you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Guile is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with Guile. If not, see
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<https://www.gnu.org/licenses/>. */
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#include "libguile/scm.h"
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struct scm_jit_function_data;
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struct scm_jit_state;
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#ifdef BUILDING_LIBGUILE
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struct scm_jit_function_data
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{
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uint8_t *mcode;
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uint32_t counter;
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int32_t start;
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int32_t end;
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#if SCM_SIZEOF_UINTPTR_T == 4
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#elif SCM_SIZEOF_UINTPTR_T == 8
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uint32_t pad;
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#else
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#error unhandled sizeof(uintptr_t)
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#endif
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};
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/* These values should be even, so that a function's counter is never
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0xffffffff, so that setting the JIT threshold to 0xffffffff always
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disables compilation. */
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enum scm_jit_counter_value
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{
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SCM_JIT_COUNTER_ENTRY_INCREMENT = 30,
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SCM_JIT_COUNTER_LOOP_INCREMENT = 2,
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};
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#endif
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SCM_INTERNAL uint32_t scm_jit_counter_threshold;
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SCM_INTERNAL const uint8_t *scm_jit_compute_mcode (scm_thread *thread,
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struct scm_jit_function_data *data);
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SCM_INTERNAL void scm_jit_enter_mcode (scm_thread *thread,
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const uint8_t *mcode);
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SCM_INTERNAL void scm_jit_state_free (struct scm_jit_state *j);
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SCM_INTERNAL void *scm_jit_return_to_interpreter_trampoline;
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SCM_INTERNAL void scm_jit_clear_mcode_return_addresses (scm_thread *thread);
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SCM_INTERNAL void scm_init_jit (void);
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#endif /* SCM_JIT_H */
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