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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef VBOX
#pragma ident "%Z%%M% %I% %E% SMI"
#endif
/*
* DTrace Parsing Control Block
*
* A DTrace Parsing Control Block (PCB) contains all of the state that is used
* by a single pass of the D compiler, other than the global variables used by
* lex and yacc. The routines in this file are used to set up and tear down
* PCBs, which are kept on a stack pointed to by the libdtrace global 'yypcb'.
* The main engine of the compiler, dt_compile(), is located in dt_cc.c and is
* responsible for calling these routines to begin and end a compilation pass.
*
* Sun's lex/yacc are not MT-safe or re-entrant, but we permit limited nested
* use of dt_compile() once the entire parse tree has been constructed but has
* not yet executed the "cooking" pass (see dt_cc.c for more information). The
* PCB design also makes it easier to debug (since all global state is kept in
* one place) and could permit us to make the D compiler MT-safe or re-entrant
* in the future by adding locks to libdtrace or switching to Flex and Bison.
*/
#ifndef VBOX
#include <strings.h>
#include <stdlib.h>
#include <assert.h>
#endif
#include <dt_impl.h>
#include <dt_program.h>
#include <dt_provider.h>
#include <dt_pcb.h>
/*
* Initialize the specified PCB by zeroing it and filling in a few default
* members, and then pushing it on to the top of the PCB stack and setting
* yypcb to point to it. Increment the current handle's generation count.
*/
void
dt_pcb_push(dtrace_hdl_t *dtp, dt_pcb_t *pcb)
{
/*
* Since lex/yacc are not re-entrant and we don't implement state save,
* assert that if another PCB is active, it is from the same handle and
* has completed execution of yyparse(). If the first assertion fires,
* the caller is calling libdtrace without proper MT locking. If the
* second assertion fires, dt_compile() is being called recursively
* from an illegal location in libdtrace, or a dt_pcb_pop() is missing.
*/
if (yypcb != NULL) {
assert(yypcb->pcb_hdl == dtp);
assert(yypcb->pcb_yystate == YYS_DONE);
}
bzero(pcb, sizeof (dt_pcb_t));
dt_scope_create(&pcb->pcb_dstack);
dt_idstack_push(&pcb->pcb_globals, dtp->dt_globals);
dt_irlist_create(&pcb->pcb_ir);
pcb->pcb_hdl = dtp;
pcb->pcb_prev = dtp->dt_pcb;
dtp->dt_pcb = pcb;
dtp->dt_gen++;
#ifndef USING_FLEX /* In case flex starts work too early. Moved to dt_compile. */
yyinit(pcb);
#endif
}
static int
dt_pcb_pop_ident(dt_idhash_t *dhp, dt_ident_t *idp, void *arg)
{
dtrace_hdl_t *dtp = arg;
if (idp->di_gen == dtp->dt_gen)
dt_idhash_delete(dhp, idp);
return (0);
}
/*
* Pop the topmost PCB from the PCB stack and destroy any data structures that
* are associated with it. If 'err' is non-zero, destroy any intermediate
* state that is left behind as part of a compilation that has failed.
*/
void
dt_pcb_pop(dtrace_hdl_t *dtp, int err)
{
dt_pcb_t *pcb = yypcb;
uint_t i;
assert(pcb != NULL);
assert(pcb == dtp->dt_pcb);
while (pcb->pcb_dstack.ds_next != NULL)
(void) dt_scope_pop();
dt_scope_destroy(&pcb->pcb_dstack);
dt_irlist_destroy(&pcb->pcb_ir);
dt_node_link_free(&pcb->pcb_list);
dt_node_link_free(&pcb->pcb_hold);
if (err != 0) {
dt_xlator_t *dxp, *nxp;
dt_provider_t *pvp, *nvp;
if (pcb->pcb_prog != NULL)
dt_program_destroy(dtp, pcb->pcb_prog);
if (pcb->pcb_stmt != NULL)
dtrace_stmt_destroy(dtp, pcb->pcb_stmt);
if (pcb->pcb_ecbdesc != NULL)
dt_ecbdesc_release(dtp, pcb->pcb_ecbdesc);
for (dxp = dt_list_next(&dtp->dt_xlators); dxp; dxp = nxp) {
nxp = dt_list_next(dxp);
if (dxp->dx_gen == dtp->dt_gen)
dt_xlator_destroy(dtp, dxp);
}
for (pvp = dt_list_next(&dtp->dt_provlist); pvp; pvp = nvp) {
nvp = dt_list_next(pvp);
if (pvp->pv_gen == dtp->dt_gen)
dt_provider_destroy(dtp, pvp);
}
(void) dt_idhash_iter(dtp->dt_aggs, dt_pcb_pop_ident, dtp);
dt_idhash_update(dtp->dt_aggs);
(void) dt_idhash_iter(dtp->dt_globals, dt_pcb_pop_ident, dtp);
dt_idhash_update(dtp->dt_globals);
(void) dt_idhash_iter(dtp->dt_tls, dt_pcb_pop_ident, dtp);
dt_idhash_update(dtp->dt_tls);
(void) ctf_discard(dtp->dt_cdefs->dm_ctfp);
(void) ctf_discard(dtp->dt_ddefs->dm_ctfp);
}
if (pcb->pcb_pragmas != NULL)
dt_idhash_destroy(pcb->pcb_pragmas);
if (pcb->pcb_locals != NULL)
dt_idhash_destroy(pcb->pcb_locals);
if (pcb->pcb_idents != NULL)
dt_idhash_destroy(pcb->pcb_idents);
if (pcb->pcb_inttab != NULL)
dt_inttab_destroy(pcb->pcb_inttab);
if (pcb->pcb_strtab != NULL)
dt_strtab_destroy(pcb->pcb_strtab);
if (pcb->pcb_regs != NULL)
dt_regset_destroy(pcb->pcb_regs);
for (i = 0; i < pcb->pcb_asxreflen; i++)
dt_free(dtp, pcb->pcb_asxrefs[i]);
dt_free(dtp, pcb->pcb_asxrefs);
dt_difo_free(dtp, pcb->pcb_difo);
free(pcb->pcb_filetag);
free(pcb->pcb_sflagv);
dtp->dt_pcb = pcb->pcb_prev;
bzero(pcb, sizeof (dt_pcb_t));
yyinit(dtp->dt_pcb);
}
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