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https://git.savannah.gnu.org/git/guile.git
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f312025167
* libguile/vm-i-system.c (call_cc, tail_call_cc): Call the new RESTORE_CONTINUATION_HOOK when a continuation is restored. (prompt): Call the new ABORT_CONTINUATION_HOOK when entering the abort handler's continuation. * libguile/vm-engine.h (ABORT_CONTINUATION_HOOK) (RESTORE_CONTINUATION_HOOK): * libguile/vm.h (SCM_VM_ABORT_CONTINUATION_HOOK) (SCM_VM_RESTORE_CONTINUATION_HOOK): * libguile/vm.c: (scm_vm_abort_continuation_hook): New hook, called when entering an abort handler. (scm_vm_restore_continuation_hook): New hook, called after returning to a continuation. * module/system/vm/vm.scm: Add hooks to export list.
385 lines
11 KiB
C
385 lines
11 KiB
C
/* Copyright (C) 2001, 2009, 2010 Free Software Foundation, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 3 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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/* This file is included in vm_engine.c */
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/*
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* Registers
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*/
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/* Register optimization. [ stolen from librep/src/lispmach.h,v 1.3 ]
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Some compilers underestimate the use of the local variables representing
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the abstract machine registers, and don't put them in hardware registers,
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which slows down the interpreter considerably.
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For GCC, I have hand-assigned hardware registers for several architectures.
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*/
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#ifdef __GNUC__
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#ifdef __mips__
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#define IP_REG asm("$16")
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#define SP_REG asm("$17")
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#define FP_REG asm("$18")
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#endif
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#ifdef __sparc__
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#define IP_REG asm("%l0")
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#define SP_REG asm("%l1")
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#define FP_REG asm("%l2")
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#endif
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#ifdef __alpha__
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#ifdef __CRAY__
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#define IP_REG asm("r9")
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#define SP_REG asm("r10")
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#define FP_REG asm("r11")
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#else
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#define IP_REG asm("$9")
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#define SP_REG asm("$10")
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#define FP_REG asm("$11")
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#endif
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#endif
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#ifdef __i386__
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/* too few registers! because of register allocation errors with various gcs,
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just punt on explicit assignments on i386, hoping that the "register"
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declaration will be sufficient. */
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#endif
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#if defined(PPC) || defined(_POWER) || defined(_IBMR2)
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#define IP_REG asm("26")
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#define SP_REG asm("27")
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#define FP_REG asm("28")
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#endif
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#ifdef __hppa__
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#define IP_REG asm("%r18")
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#define SP_REG asm("%r17")
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#define FP_REG asm("%r16")
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#endif
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#ifdef __mc68000__
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#define IP_REG asm("a5")
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#define SP_REG asm("a4")
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#define FP_REG
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#endif
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#ifdef __arm__
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#define IP_REG asm("r9")
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#define SP_REG asm("r8")
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#define FP_REG asm("r7")
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#endif
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#endif
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#ifndef IP_REG
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#define IP_REG
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#endif
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#ifndef SP_REG
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#define SP_REG
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#endif
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#ifndef FP_REG
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#define FP_REG
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#endif
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/*
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* Cache/Sync
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*/
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#ifdef VM_ENABLE_ASSERTIONS
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# define ASSERT(condition) if (SCM_UNLIKELY (!(condition))) abort()
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#else
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# define ASSERT(condition)
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#endif
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/* Cache the VM's instruction, stack, and frame pointer in local variables. */
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#define CACHE_REGISTER() \
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{ \
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ip = vp->ip; \
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sp = vp->sp; \
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fp = vp->fp; \
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}
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/* Update the registers in VP, a pointer to the current VM. This must be done
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at least before any GC invocation so that `vp->sp' is up-to-date and the
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whole stack gets marked. */
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#define SYNC_REGISTER() \
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{ \
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vp->ip = ip; \
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vp->sp = sp; \
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vp->fp = fp; \
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}
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/* FIXME */
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#define ASSERT_VARIABLE(x) \
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do { if (!SCM_VARIABLEP (x)) { SYNC_REGISTER (); abort(); } \
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} while (0)
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#define ASSERT_BOUND_VARIABLE(x) \
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do { ASSERT_VARIABLE (x); \
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if (SCM_VARIABLE_REF (x) == SCM_UNDEFINED) \
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{ SYNC_REGISTER (); abort(); } \
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} while (0)
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#ifdef VM_ENABLE_PARANOID_ASSERTIONS
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#define CHECK_IP() \
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do { if (ip < bp->base || ip - bp->base > bp->len) abort (); } while (0)
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#define ASSERT_ALIGNED_PROCEDURE() \
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do { if ((scm_t_bits)bp % 8) abort (); } while (0)
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#define ASSERT_BOUND(x) \
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do { if ((x) == SCM_UNDEFINED) { SYNC_REGISTER (); abort(); } \
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} while (0)
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#else
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#define CHECK_IP()
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#define ASSERT_ALIGNED_PROCEDURE()
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#define ASSERT_BOUND(x)
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#endif
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/* Cache the object table and free variables. */
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#define CACHE_PROGRAM() \
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{ \
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if (bp != SCM_PROGRAM_DATA (program)) { \
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bp = SCM_PROGRAM_DATA (program); \
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ASSERT_ALIGNED_PROCEDURE (); \
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if (SCM_I_IS_VECTOR (SCM_PROGRAM_OBJTABLE (program))) { \
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objects = SCM_I_VECTOR_WELTS (SCM_PROGRAM_OBJTABLE (program)); \
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object_count = SCM_I_VECTOR_LENGTH (SCM_PROGRAM_OBJTABLE (program)); \
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} else { \
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objects = NULL; \
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object_count = 0; \
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} \
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} \
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}
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#define SYNC_BEFORE_GC() \
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{ \
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SYNC_REGISTER (); \
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}
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#define SYNC_ALL() \
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{ \
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SYNC_REGISTER (); \
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}
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/*
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* Error check
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*/
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/* Accesses to a program's object table. */
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#if VM_CHECK_OBJECT
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#define CHECK_OBJECT(_num) \
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do { if (SCM_UNLIKELY ((_num) >= object_count)) goto vm_error_object; } while (0)
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#else
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#define CHECK_OBJECT(_num)
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#endif
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#if VM_CHECK_FREE_VARIABLES
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#define CHECK_FREE_VARIABLE(_num) \
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do { \
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if (SCM_UNLIKELY ((_num) >= SCM_PROGRAM_NUM_FREE_VARIABLES (program))) \
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goto vm_error_free_variable; \
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} while (0)
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#else
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#define CHECK_FREE_VARIABLE(_num)
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#endif
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/*
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* Hooks
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*/
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#undef RUN_HOOK
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#undef RUN_HOOK1
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#if VM_USE_HOOKS
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#define RUN_HOOK(h) \
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{ \
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if (SCM_UNLIKELY (vp->trace_level > 0)) \
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{ \
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SYNC_REGISTER (); \
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vm_dispatch_hook (vm, h); \
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} \
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}
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#define RUN_HOOK1(h, x) \
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{ \
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if (SCM_UNLIKELY (vp->trace_level > 0)) \
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{ \
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PUSH (x); \
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SYNC_REGISTER (); \
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vm_dispatch_hook (vm, h); \
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DROP(); \
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} \
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}
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#else
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#define RUN_HOOK(h)
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#define RUN_HOOK1(h, x)
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#endif
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#define APPLY_HOOK() \
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RUN_HOOK (SCM_VM_APPLY_HOOK)
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#define PUSH_CONTINUATION_HOOK() \
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RUN_HOOK (SCM_VM_PUSH_CONTINUATION_HOOK)
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#define POP_CONTINUATION_HOOK(n) \
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RUN_HOOK1 (SCM_VM_POP_CONTINUATION_HOOK, SCM_I_MAKINUM (n))
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#define NEXT_HOOK() \
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RUN_HOOK (SCM_VM_NEXT_HOOK)
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#define ABORT_CONTINUATION_HOOK() \
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RUN_HOOK (SCM_VM_ABORT_CONTINUATION_HOOK)
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#define RESTORE_CONTINUATION_HOOK() \
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RUN_HOOK (SCM_VM_RESTORE_CONTINUATION_HOOK)
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#define VM_HANDLE_INTERRUPTS \
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SCM_ASYNC_TICK_WITH_CODE (SYNC_REGISTER ())
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/*
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* Stack operation
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*/
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#ifdef VM_ENABLE_STACK_NULLING
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# define CHECK_STACK_LEAKN(_n) ASSERT (!sp[_n]);
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# define CHECK_STACK_LEAK() CHECK_STACK_LEAKN(1)
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# define NULLSTACK(_n) { int __x = _n; CHECK_STACK_LEAKN (_n+1); while (__x > 0) sp[__x--] = NULL; }
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/* If you have a nonlocal exit in a pre-wind proc while invoking a continuation
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inside a dynwind (phew!), the stack is fully rewound but vm_reset_stack for
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that continuation doesn't have a chance to run. It's not important on a
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semantic level, but it does mess up our stack nulling -- so this macro is to
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fix that. */
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# define NULLSTACK_FOR_NONLOCAL_EXIT() if (vp->sp > sp) NULLSTACK (vp->sp - sp);
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#else
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# define CHECK_STACK_LEAKN(_n)
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# define CHECK_STACK_LEAK()
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# define NULLSTACK(_n)
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# define NULLSTACK_FOR_NONLOCAL_EXIT()
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#endif
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#define CHECK_OVERFLOW() \
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if (SCM_UNLIKELY (sp >= stack_limit)) \
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goto vm_error_stack_overflow
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#define CHECK_UNDERFLOW() \
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if (SCM_UNLIKELY (sp <= SCM_FRAME_UPPER_ADDRESS (fp))) \
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goto vm_error_stack_underflow;
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#define PRE_CHECK_UNDERFLOW(N) \
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if (SCM_UNLIKELY (sp - N <= SCM_FRAME_UPPER_ADDRESS (fp))) \
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goto vm_error_stack_underflow;
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#define PUSH(x) do { sp++; CHECK_OVERFLOW (); *sp = x; } while (0)
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#define DROP() do { sp--; CHECK_UNDERFLOW (); NULLSTACK (1); } while (0)
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#define DROPN(_n) do { sp -= (_n); CHECK_UNDERFLOW (); NULLSTACK (_n); } while (0)
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#define POP(x) do { PRE_CHECK_UNDERFLOW (1); x = *sp--; NULLSTACK (1); } while (0)
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/* A fast CONS. This has to be fast since its used, for instance, by
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POP_LIST when fetching a function's argument list. Note: `scm_cell' is an
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inlined function in Guile 1.7. Unfortunately, it calls
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`scm_gc_for_newcell ()' which is _not_ inlined and allocated cells on the
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heap. XXX */
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#define CONS(x,y,z) \
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{ \
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SYNC_BEFORE_GC (); \
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x = scm_cell (SCM_UNPACK (y), SCM_UNPACK (z)); \
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}
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/* Pop the N objects on top of the stack and push a list that contains
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them. */
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#define POP_LIST(n) \
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do \
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{ \
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int i; \
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SCM l = SCM_EOL, x; \
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for (i = n; i; i--) \
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{ \
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POP (x); \
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CONS (l, x, l); \
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} \
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PUSH (l); \
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} while (0)
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/* The opposite: push all of the elements in L onto the list. */
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#define PUSH_LIST(l, NILP) \
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do \
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{ \
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for (; scm_is_pair (l); l = SCM_CDR (l)) \
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PUSH (SCM_CAR (l)); \
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if (SCM_UNLIKELY (!NILP (l))) { \
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finish_args = scm_list_1 (l); \
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goto vm_error_improper_list; \
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} \
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} while (0)
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#define POP_LIST_MARK() \
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do { \
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SCM o; \
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SCM l = SCM_EOL; \
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POP (o); \
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while (!SCM_UNBNDP (o)) \
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{ \
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CONS (l, o, l); \
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POP (o); \
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} \
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PUSH (l); \
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} while (0)
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#define POP_CONS_MARK() \
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do { \
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SCM o, l; \
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POP (l); \
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POP (o); \
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while (!SCM_UNBNDP (o)) \
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{ \
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CONS (l, o, l); \
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POP (o); \
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} \
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PUSH (l); \
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} while (0)
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/*
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* Instruction operation
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*/
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#define FETCH() (*ip++)
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#define FETCH_LENGTH(len) do { len=*ip++; len<<=8; len+=*ip++; len<<=8; len+=*ip++; } while (0)
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#undef NEXT_JUMP
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#ifdef HAVE_LABELS_AS_VALUES
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#define NEXT_JUMP() goto *jump_table[FETCH () & SCM_VM_INSTRUCTION_MASK]
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#else
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#define NEXT_JUMP() goto vm_start
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#endif
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#define NEXT \
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{ \
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NEXT_HOOK (); \
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CHECK_STACK_LEAK (); \
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NEXT_JUMP (); \
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}
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/* See frames.h for the layout of stack frames */
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/* When this is called, bp points to the new program data,
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and the arguments are already on the stack */
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#define DROP_FRAME() \
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{ \
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sp -= 3; \
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NULLSTACK (3); \
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CHECK_UNDERFLOW (); \
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}
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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