GCOV - Varnish Cache


/*-
 * Copyright (c) 2006 Verdens Gang AS
 * Copyright (c) 2006-2011 Varnish Software AS
 * All rights reserved.
 *
 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * This file contains code for two cross-reference or consistency checks.
 *
 * The first check is simply that all subroutine, acls and backends are
 * both defined and referenced.  Complaints about referenced but undefined
 * or defined but unreferenced objects will be emitted.
 *
 * The second check recursively descends through subroutine calls to make
 * sure that action actions are correct for the methods through which
 * they are called.
 */

#include "config.h"

#include <string.h>
#include "vcc_compile.h"

/*--------------------------------------------------------------------*/

struct proccall {
        VTAILQ_ENTRY(proccall)  list;
        struct symbol           *sym;
        struct token            *t;
        struct proc             *fm;
};

struct procuse {
        VTAILQ_ENTRY(procuse)   list;
        const struct token      *t1;
        const struct token      *t2;
        const struct symbol     *sym;
        const struct xrefuse    *use;
        unsigned                mask;
        struct proc             *fm;
};

/*--------------------------------------------------------------------*/

static void
vcc_checkref(struct vcc *tl, const struct symbol *sym)
{

        if (sym->noref)
                return;
        if (sym->ndef == 0 && sym->nref != 0) {
                AN(sym->ref_b);
                VSB_printf(tl->sb, "Undefined %s %.*s, first reference:\n",
                    sym->kind->name, PF(sym->ref_b));
                vcc_ErrWhere(tl, sym->ref_b);
        } else if (sym->ndef != 0 && sym->nref == 0) {
                AN(sym->def_b);
                VSB_printf(tl->sb, "Unused %s %.*s, defined:\n",
                    sym->kind->name, PF(sym->def_b));
                vcc_ErrWhere(tl, sym->def_b);
                if (!tl->err_unref)
                        vcc_Warn(tl);
        }
}

int
vcc_CheckReferences(struct vcc *tl)
{

        VCC_WalkSymbols(tl, vcc_checkref, SYM_MAIN, SYM_NONE);
        return (tl->err);
}

/*--------------------------------------------------------------------
 * Returns checks
 */

const struct xrefuse XREF_READ[1] = {{"xref_read", "Not available"}};
const struct xrefuse XREF_WRITE[1] = {{"xref_write", "Cannot be set"}};
const struct xrefuse XREF_UNSET[1] = {{"xref_unset", "Cannot be unset"}};
const struct xrefuse XREF_ACTION[1] = {{"xref_action", "Not a valid action"}};

void
vcc_AddUses(struct vcc *tl, const struct token *t1, const struct token *t2,
    const struct symbol *sym, const struct xrefuse *use)
{
        struct procuse *pu;

        AN(tl->curproc);
        pu = TlAlloc(tl, sizeof *pu);
        AN(pu);
        AN(sym);
        AN(use);
        AN(use->name);
        pu->t1 = t1;
        pu->t2 = t2;
        if (pu->t2 == NULL) {
                pu->t2 = vcc_PeekTokenFrom(tl, t1);
                AN(pu->t2);
        }
        pu->sym = sym;
        pu->use = use;
        pu->fm = tl->curproc;

        if (pu->use == XREF_READ)
                pu->mask = sym->r_methods;
        else if (pu->use == XREF_WRITE)
                pu->mask = sym->w_methods;
        else if (pu->use == XREF_UNSET)
                pu->mask = sym->u_methods;
        else if (pu->use == XREF_ACTION)
                pu->mask = sym->action_mask;
        else
                WRONG("wrong xref use");

        VTAILQ_INSERT_TAIL(&tl->curproc->uses, pu, list);
}

void
vcc_AddCall(struct vcc *tl, struct token *t, struct symbol *sym)
{
        struct proccall *pc;

        AN(sym);
        pc = TlAlloc(tl, sizeof *pc);
        AN(pc);
        pc->sym = sym;
        pc->t = t;
        pc->fm = tl->curproc;
        VTAILQ_INSERT_TAIL(&tl->curproc->calls, pc, list);
}

void
vcc_ProcAction(struct proc *p, unsigned returns, unsigned mask, struct token *t)
{

        assert(returns < VCL_RET_MAX);
        p->ret_bitmap |= (1U << returns);
        p->okmask &= mask;
        /* Record the first instance of this return */
        if (p->return_tok[returns] == NULL)
                p->return_tok[returns] = t;
}

static int
vcc_CheckActionRecurse(struct vcc *tl, struct proc *p, unsigned bitmap)
{
        unsigned u;
        struct proccall *pc;

        AN(p);
        if (p->active) {
                VSB_cat(tl->sb, "Subroutine recurses on\n");
                vcc_ErrWhere(tl, p->name);
                return (1);
        }
        u = p->ret_bitmap & ~bitmap;
        if (u) {

#define VCL_RET_MAC(l, U, B)                                            \
                if (u & (1 << (VCL_RET_##U))) {                         \
                        VSB_printf(tl->sb, "Invalid return \"" #l "\"\n");\
                        vcc_ErrWhere(tl, p->return_tok[VCL_RET_##U]);   \
                }
#include "tbl/vcl_returns.h"

                VSB_printf(tl->sb, "\n...in subroutine \"%.*s\"\n",
                    PF(p->name));
                vcc_ErrWhere(tl, p->name);
                return (1);
        }

        // more references than calls -> sub is referenced for dynamic calls
        u = (p->sym->nref > p->called);

        p->active = 1;
        VTAILQ_FOREACH(pc, &p->calls, list) {
                if (pc->sym->proc == NULL) {
                        VSB_printf(tl->sb, "Subroutine %s does not exist\n",
                            pc->sym->name);
                        vcc_ErrWhere(tl, pc->t);
                        return (1);
                }
                pc->sym->proc->calledfrom |= p->calledfrom;
                pc->sym->proc->called++;
                pc->sym->nref += u;
                if (vcc_CheckActionRecurse(tl, pc->sym->proc, bitmap)) {
                        VSB_printf(tl->sb, "\n...called from \"%.*s\"\n",
                            PF(p->name));
                        vcc_ErrWhere(tl, pc->t);
                        return (1);
                }
                p->okmask &= pc->sym->proc->okmask;
        }
        p->active = 0;
        return (0);
}

/*--------------------------------------------------------------------*/

static void
vcc_checkaction(struct vcc *tl, const struct symbol *sym)
{
        struct proc *p;
        unsigned bitmap;

        p = sym->proc;
        AN(p);
        AN(p->name);

        if (p->method == NULL) {
                bitmap = ~0U;
        } else {
                bitmap = p->method->ret_bitmap;
                p->calledfrom = p->method->bitval;
        }

        if (! vcc_CheckActionRecurse(tl, p, bitmap))
                return;

        tl->err = 1;
        if (p->method == NULL)
                return;

        VSB_printf(tl->sb,
                   "\n...which is the \"%s\" subroutine\n", p->method->name);
        VSB_cat(tl->sb, "Legal returns are:");
#define VCL_RET_MAC(l, U, B)                                            \
        if (p->method->ret_bitmap & ((1 << VCL_RET_##U)))               \
                VSB_printf(tl->sb, " \"%s\"", #l);

#include "tbl/vcl_returns.h"
        VSB_cat(tl->sb, "\n");
}

int
vcc_CheckAction(struct vcc *tl)
{

        VCC_WalkSymbols(tl, vcc_checkaction, SYM_MAIN, SYM_SUB);
        return (tl->err);
}

/*--------------------------------------------------------------------*/

static struct procuse *
vcc_illegal_write(struct vcc *tl, struct procuse *pu, const struct method *m)
{

        if (pu->mask || pu->use != XREF_WRITE)
                return (NULL);

        if (pu->sym->r_methods == 0) {
                vcc_ErrWhere2(tl, pu->t1, pu->t2);
                VSB_cat(tl->sb, "Variable cannot be set.\n");
                return (NULL);
        }

        if (!(pu->sym->r_methods & m->bitval)) {
                pu->use = XREF_READ; /* NB: change the error message. */
                return (pu);
        }

        vcc_ErrWhere2(tl, pu->t1, pu->t2);
        VSB_cat(tl->sb, "Variable is read only.\n");
        return (NULL);
}

static struct procuse *
vcc_FindIllegalUse(struct vcc *tl, struct proc *p, const struct method *m)
{
        struct procuse *pu, *pw, *r = NULL;

        VTAILQ_FOREACH(pu, &p->uses, list) {
                p->okmask &= pu->mask;
                if (m == NULL)
                        continue;
                pw = vcc_illegal_write(tl, pu, m);
                if (r != NULL)
                        continue;
                if (tl->err)
                        r = pw;
                else if (!(pu->mask & m->bitval))
                        r = pu;
        }
        return (r);
}

static int
vcc_CheckUseRecurse(struct vcc *tl, struct proc *p,
    const struct method *m)
{
        struct proccall *pc;
        struct procuse *pu;

        pu = vcc_FindIllegalUse(tl, p, m);
        if (pu != NULL) {
                vcc_ErrWhere2(tl, pu->t1, pu->t2);
                VSB_printf(tl->sb, "%s from subroutine '%s'.\n",
                    pu->use->err, m->name);
                VSB_printf(tl->sb, "\n...in subroutine \"%.*s\"\n",
                    PF(pu->fm->name));
                vcc_ErrWhere(tl, p->name);
                return (1);
        }
        if (tl->err)
                return (1);
        VTAILQ_FOREACH(pc, &p->calls, list) {
                if (vcc_CheckUseRecurse(tl, pc->sym->proc, m)) {
                        VSB_printf(tl->sb, "\n...called from \"%.*s\"\n",
                            PF(p->name));
                        vcc_ErrWhere(tl, pc->t);
                        return (1);
                }
                p->okmask &= pc->sym->proc->okmask;
        }
        return (0);
}

static void
vcc_checkuses(struct vcc *tl, const struct symbol *sym)
{
        struct proc *p;
        struct procuse *pu;

        p = sym->proc;
        AN(p);
        pu = vcc_FindIllegalUse(tl, p, p->method);
        if (pu != NULL) {
                vcc_ErrWhere2(tl, pu->t1, pu->t2);
                VSB_printf(tl->sb, "%s in subroutine '%.*s'.",
                    pu->use->err, PF(p->name));
                VSB_cat(tl->sb, "\nAt: ");
                return;
        }
        ERRCHK(tl);
        if (vcc_CheckUseRecurse(tl, p, p->method)) {
                VSB_printf(tl->sb,
                    "\n...which is the \"%s\" subroutine\n", p->method->name);
                return;
        }
}

/*
 * Used from a second symbol walk because vcc_checkuses is more precise for
 * subroutines called from methods. We catch here subs used for dynamic calls
 * and with vcc_err_unref = off
 */
static void
vcc_checkpossible(struct vcc *tl, const struct symbol *sym)
{
        struct proc *p;

        p = sym->proc;
        AN(p);

        if (p->okmask != 0)
                return;

        VSB_cat(tl->sb, "Impossible Subroutine");
        vcc_ErrWhere(tl, p->name);
}

int
vcc_CheckUses(struct vcc *tl)
{

        VCC_WalkSymbols(tl, vcc_checkuses, SYM_MAIN, SYM_SUB);
        if (tl->err)
                return (tl->err);
        VCC_WalkSymbols(tl, vcc_checkpossible, SYM_MAIN, SYM_SUB);
        return (tl->err);
}

/*---------------------------------------------------------------------*/

static void v_matchproto_(symwalk_f)
vcc_instance_info(struct vcc *tl, const struct symbol *sym)
{

        CHECK_OBJ_NOTNULL(sym, SYMBOL_MAGIC);
        AN(sym->rname);
        Fc(tl, 0, "\t{ .p = (uintptr_t *)&%s, .name = \"", sym->rname);
        VCC_SymName(tl->fc, sym);
        Fc(tl, 0, "\" },\n");
}

void
VCC_InstanceInfo(struct vcc *tl)
{
        Fc(tl, 0, "\nstatic const struct vpi_ii VGC_instance_info[] = {\n");
        VCC_WalkSymbols(tl, vcc_instance_info, SYM_MAIN, SYM_INSTANCE);
        Fc(tl, 0, "\t{ .p = NULL, .name = \"\" }\n");
        Fc(tl, 0, "};\n");
}

/*---------------------------------------------------------------------*/

static int sym_type_len;

static void v_matchproto_(symwalk_f)
vcc_xreftable_len(struct vcc *tl, const struct symbol *sym)
{
        int len;

        (void)tl;
        CHECK_OBJ_NOTNULL(sym, SYMBOL_MAGIC);
        CHECK_OBJ_NOTNULL(sym->type, TYPE_MAGIC);
        len = strlen(sym->type->name);
        if (sym_type_len < len)
                sym_type_len = len;
}

static void v_matchproto_(symwalk_f)
vcc_xreftable(struct vcc *tl, const struct symbol *sym)
{

        CHECK_OBJ_NOTNULL(sym, SYMBOL_MAGIC);
        CHECK_OBJ_NOTNULL(sym->kind, KIND_MAGIC);
        CHECK_OBJ_NOTNULL(sym->type, TYPE_MAGIC);
        Fc(tl, 0, " * %-8s ", sym->kind->name);
        Fc(tl, 0, " %-*s ", sym_type_len, sym->type->name);
        Fc(tl, 0, " %2u %2u ", sym->lorev, sym->hirev);
        VCC_SymName(tl->fc, sym);
        if (sym->wildcard != NULL)
                Fc(tl, 0, "*");
        Fc(tl, 0, "\n");
}

void
VCC_XrefTable(struct vcc *tl)
{

#define VCC_NAMESPACE(U, l)                                             \
        Fc(tl, 0, "\n/*\n * Symbol Table " #U "\n *\n");                \
        sym_type_len = 0;                                               \
        VCC_WalkSymbols(tl, vcc_xreftable_len, SYM_##U, SYM_NONE);      \
        VCC_WalkSymbols(tl, vcc_xreftable, SYM_##U, SYM_NONE);          \
        Fc(tl, 0, "*/\n\n");
#include "vcc_namespace.h"
}

		varnish-cache/lib/libvcc/vcc_xref.c
0		/*-
1		* Copyright (c) 2006 Verdens Gang AS
2		* Copyright (c) 2006-2011 Varnish Software AS
3		* All rights reserved.
4		*
5		* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
6		*
7		* SPDX-License-Identifier: BSD-2-Clause
8		*
9	4	* Redistribution and use in source and binary forms, with or without
10		* modification, are permitted provided that the following conditions
11		* are met:
12		* 1. Redistributions of source code must retain the above copyright
13		* notice, this list of conditions and the following disclaimer.
14		* 2. Redistributions in binary form must reproduce the above copyright
15		* notice, this list of conditions and the following disclaimer in the
16	4	* documentation and/or other materials provided with the distribution.
17		*
18		* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20	4	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21		* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
22		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28	4	* SUCH DAMAGE.
29		*
30		* This file contains code for two cross-reference or consistency checks.
31		*
32		* The first check is simply that all subroutine, acls and backends are
33		* both defined and referenced. Complaints about referenced but undefined
34	4	* or defined but unreferenced objects will be emitted.
35		*
36		* The second check recursively descends through subroutine calls to make
37		* sure that action actions are correct for the methods through which
38		* they are called.
39		*/
40
41		#include "config.h"
42
43		#include <string.h>
44		#include "vcc_compile.h"
45
46		/--------------------------------------------------------------------/
47
48		struct proccall {
49		VTAILQ_ENTRY(proccall) list;
50		struct symbol *sym;
51	4	struct token *t;
52		struct proc *fm;
53		};
54
55		struct procuse {
56		VTAILQ_ENTRY(procuse) list;
57	4	const struct token *t1;
58		const struct token *t2;
59		const struct symbol *sym;
60		const struct xrefuse *use;
61	4	unsigned mask;
62		struct proc *fm;
63		};
64
65	4	/--------------------------------------------------------------------/
66
67		static void
68	1383092	vcc_checkref(struct vcc tl, const struct symbol sym)
69	4	{
70
71	1383092	if (sym->noref)
72	1233788	return;
73	149308	if (sym->ndef == 0 && sym->nref != 0) {
74	6	AN(sym->ref_b);
75	12	VSB_printf(tl->sb, "Undefined %s %.*s, first reference:\n",
76	6	sym->kind->name, PF(sym->ref_b));
77	6	vcc_ErrWhere(tl, sym->ref_b);
78	149308	} else if (sym->ndef != 0 && sym->nref == 0) {
79	254	AN(sym->def_b);
80	508	VSB_printf(tl->sb, "Unused %s %.*s, defined:\n",
81	254	sym->kind->name, PF(sym->def_b));
82	254	vcc_ErrWhere(tl, sym->def_b);
83	254	if (!tl->err_unref)
84	242	vcc_Warn(tl);
85	258	}
86	1383092	}
87
88		int
89	5690	vcc_CheckReferences(struct vcc *tl)
90	4	{
91
92	5690	VCC_WalkSymbols(tl, vcc_checkref, SYM_MAIN, SYM_NONE);
93	5690	return (tl->err);
94	4	}
95
96		/*--------------------------------------------------------------------
97		* Returns checks
98		*/
99
100		const struct xrefuse XREF_READ[1] = {{"xref_read", "Not available"}};
101		const struct xrefuse XREF_WRITE[1] = {{"xref_write", "Cannot be set"}};
102		const struct xrefuse XREF_UNSET[1] = {{"xref_unset", "Cannot be unset"}};
103		const struct xrefuse XREF_ACTION[1] = {{"xref_action", "Not a valid action"}};
104	4
105		void
106	374630	vcc_AddUses(struct vcc tl, const struct token t1, const struct token *t2,
107		const struct symbol sym, const struct xrefuse use)
108		{
109		struct procuse *pu;
110	4
111	374630	AN(tl->curproc);
112	374630	pu = TlAlloc(tl, sizeof *pu);
113	374630	AN(pu);
114	374630	AN(sym);
115	374630	AN(use);
116	374630	AN(use->name);
117	374630	pu->t1 = t1;
118	374630	pu->t2 = t2;
119	374630	if (pu->t2 == NULL) {
120	300572	pu->t2 = vcc_PeekTokenFrom(tl, t1);
121	300568	AN(pu->t2);
122	300568	}
123	374630	pu->sym = sym;
124	374630	pu->use = use;
125	374630	pu->fm = tl->curproc;
126
127	374630	if (pu->use == XREF_READ)
128	283044	pu->mask = sym->r_methods;
129	91586	else if (pu->use == XREF_WRITE)
130	62564	pu->mask = sym->w_methods;
131	29022	else if (pu->use == XREF_UNSET)
132	11498	pu->mask = sym->u_methods;
133	17524	else if (pu->use == XREF_ACTION)
134	17524	pu->mask = sym->action_mask;
135		else
136	0	WRONG("wrong xref use");
137
138	374630	VTAILQ_INSERT_TAIL(&tl->curproc->uses, pu, list);
139	374630	}
140
141		void
142	165284	vcc_AddCall(struct vcc tl, struct token t, struct symbol *sym)
143		{
144		struct proccall *pc;
145
146	165284	AN(sym);
147	165284	pc = TlAlloc(tl, sizeof *pc);
148	165284	AN(pc);
149	165284	pc->sym = sym;
150	165284	pc->t = t;
151	165284	pc->fm = tl->curproc;
152	165284	VTAILQ_INSERT_TAIL(&tl->curproc->calls, pc, list);
153	165284	}
154
155		void
156	143510	vcc_ProcAction(struct proc p, unsigned returns, unsigned mask, struct token t)
157		{
158
159	143510	assert(returns < VCL_RET_MAX);
160	143510	p->ret_bitmap \|= (1U << returns);
161	143510	p->okmask &= mask;
162		/* Record the first instance of this return */
163	143510	if (p->return_tok[returns] == NULL)
164	143150	p->return_tok[returns] = t;
165	143510	}
166
167		static int
168	510556	vcc_CheckActionRecurse(struct vcc tl, struct proc p, unsigned bitmap)
169		{
170		unsigned u;
171		struct proccall *pc;
172
173	510556	AN(p);
174	510556	if (p->active) {
175	4	VSB_cat(tl->sb, "Subroutine recurses on\n");
176	4	vcc_ErrWhere(tl, p->name);
177	4	return (1);
178		}
179	510552	u = p->ret_bitmap & ~bitmap;
180	510552	if (u) {
181
182		#define VCL_RET_MAC(l, U, B) \
183		if (u & (1 << (VCL_RET_##U))) { \
184		VSB_printf(tl->sb, "Invalid return \"" #l "\"\n");\
185		vcc_ErrWhere(tl, p->return_tok[VCL_RET_##U]); \
186		}
187		#include "tbl/vcl_returns.h"
188
189		VSB_printf(tl->sb, "\n...in subroutine \"%.*s\"\n",
190		PF(p->name));
191		vcc_ErrWhere(tl, p->name);
192		return (1);
193		}
194
195		// more references than calls -> sub is referenced for dynamic calls
196	510550	u = (p->sym->nref > p->called);
197
198	510550	p->active = 1;
199	788588	VTAILQ_FOREACH(pc, &p->calls, list) {
200	278046	if (pc->sym->proc == NULL) {
201	0	VSB_printf(tl->sb, "Subroutine %s does not exist\n",
202	0	pc->sym->name);
203	0	vcc_ErrWhere(tl, pc->t);
204	0	return (1);
205		}
206	278046	pc->sym->proc->calledfrom \|= p->calledfrom;
207	278046	pc->sym->proc->called++;
208	278046	pc->sym->nref += u;
209	278046	if (vcc_CheckActionRecurse(tl, pc->sym->proc, bitmap)) {
210	16	VSB_printf(tl->sb, "\n...called from \"%.*s\"\n",
211	8	PF(p->name));
212	8	vcc_ErrWhere(tl, pc->t);
213	8	return (1);
214		}
215	278038	p->okmask &= pc->sym->proc->okmask;
216	278038	}
217	510542	p->active = 0;
218	510542	return (0);
219	510556	}
220
221		/--------------------------------------------------------------------/
222
223		static void
224	232510	vcc_checkaction(struct vcc tl, const struct symbol sym)
225		{
226		struct proc *p;
227		unsigned bitmap;
228
229	232510	p = sym->proc;
230	232510	AN(p);
231	232510	AN(p->name);
232
233	232510	if (p->method == NULL) {
234	147492	bitmap = ~0U;
235	147492	} else {
236	85018	bitmap = p->method->ret_bitmap;
237	85018	p->calledfrom = p->method->bitval;
238		}
239
240	232510	if (! vcc_CheckActionRecurse(tl, p, bitmap))
241	232504	return;
242
243	6	tl->err = 1;
244	6	if (p->method == NULL)
245	4	return;
246
247	4	VSB_printf(tl->sb,
248	2	"\n...which is the \"%s\" subroutine\n", p->method->name);
249	2	VSB_cat(tl->sb, "Legal returns are:");
250		#define VCL_RET_MAC(l, U, B) \
251		if (p->method->ret_bitmap & ((1 << VCL_RET_##U))) \
252		VSB_printf(tl->sb, " \"%s\"", #l);
253
254		#include "tbl/vcl_returns.h"
255		VSB_cat(tl->sb, "\n");
256		}
257
258		int
259	5672	vcc_CheckAction(struct vcc *tl)
260		{
261
262	5672	VCC_WalkSymbols(tl, vcc_checkaction, SYM_MAIN, SYM_SUB);
263	5672	return (tl->err);
264		}
265
266		/--------------------------------------------------------------------/
267
268		static struct procuse *
269	436840	vcc_illegal_write(struct vcc tl, struct procuse pu, const struct method *m)
270		{
271
272	436840	if (pu->mask \|\| pu->use != XREF_WRITE)
273	436814	return (NULL);
274
275	26	if (pu->sym->r_methods == 0) {
276	2	vcc_ErrWhere2(tl, pu->t1, pu->t2);
277	2	VSB_cat(tl->sb, "Variable cannot be set.\n");
278	2	return (NULL);
279		}
280
281	24	if (!(pu->sym->r_methods & m->bitval)) {
282	4	pu->use = XREF_READ; /* NB: change the error message. */
283	4	return (pu);
284		}
285
286	20	vcc_ErrWhere2(tl, pu->t1, pu->t2);
287	20	VSB_cat(tl->sb, "Variable is read only.\n");
288	20	return (NULL);
289	436840	}
290
291		static struct procuse *
292	738852	vcc_FindIllegalUse(struct vcc tl, struct proc p, const struct method *m)
293		{
294	738852	struct procuse pu, pw, *r = NULL;
295
296	2202260	VTAILQ_FOREACH(pu, &p->uses, list) {
297	1463408	p->okmask &= pu->mask;
298	1463408	if (m == NULL)
299	1026568	continue;
300	436840	pw = vcc_illegal_write(tl, pu, m);
301	436840	if (r != NULL)
302	14	continue;
303	436826	if (tl->err)
304	22	r = pw;
305	436804	else if (!(pu->mask & m->bitval))
306	58	r = pu;
307	436826	}
308	738852	return (r);
309		}
310
311		static int
312	507728	vcc_CheckUseRecurse(struct vcc tl, struct proc p,
313		const struct method *m)
314		{
315		struct proccall *pc;
316		struct procuse *pu;
317
318	507728	pu = vcc_FindIllegalUse(tl, p, m);
319	507728	if (pu != NULL) {
320	6	vcc_ErrWhere2(tl, pu->t1, pu->t2);
321	12	VSB_printf(tl->sb, "%s from subroutine '%s'.\n",
322	6	pu->use->err, m->name);
323	12	VSB_printf(tl->sb, "\n...in subroutine \"%.*s\"\n",
324	6	PF(pu->fm->name));
325	6	vcc_ErrWhere(tl, p->name);
326	6	return (1);
327		}
328	507722	if (tl->err)
329	2	return (1);
330	784386	VTAILQ_FOREACH(pc, &p->calls, list) {
331	276676	if (vcc_CheckUseRecurse(tl, pc->sym->proc, m)) {
332	20	VSB_printf(tl->sb, "\n...called from \"%.*s\"\n",
333	10	PF(p->name));
334	10	vcc_ErrWhere(tl, pc->t);
335	10	return (1);
336		}
337	276666	p->okmask &= pc->sym->proc->okmask;
338	276666	}
339	507710	return (0);
340	507728	}
341
342		static void
343	231124	vcc_checkuses(struct vcc tl, const struct symbol sym)
344		{
345		struct proc *p;
346		struct procuse *pu;
347
348	231124	p = sym->proc;
349	231124	AN(p);
350	231124	pu = vcc_FindIllegalUse(tl, p, p->method);
351	231124	if (pu != NULL) {
352	52	vcc_ErrWhere2(tl, pu->t1, pu->t2);
353	104	VSB_printf(tl->sb, "%s in subroutine '%.*s'.",
354	52	pu->use->err, PF(p->name));
355	52	VSB_cat(tl->sb, "\nAt: ");
356	52	return;
357		}
358	231072	ERRCHK(tl);
359	231052	if (vcc_CheckUseRecurse(tl, p, p->method)) {
360	16	VSB_printf(tl->sb,
361	8	"\n...which is the \"%s\" subroutine\n", p->method->name);
362	8	return;
363		}
364	231124	}
365
366		/*
367		* Used from a second symbol walk because vcc_checkuses is more precise for
368		* subroutines called from methods. We catch here subs used for dynamic calls
369		* and with vcc_err_unref = off
370		*/
371		static void
372	228984	vcc_checkpossible(struct vcc tl, const struct symbol sym)
373		{
374		struct proc *p;
375
376	228984	p = sym->proc;
377	228984	AN(p);
378
379	228984	if (p->okmask != 0)
380	228980	return;
381
382	4	VSB_cat(tl->sb, "Impossible Subroutine");
383	4	vcc_ErrWhere(tl, p->name);
384	228984	}
385
386		int
387	5666	vcc_CheckUses(struct vcc *tl)
388		{
389
390	5666	VCC_WalkSymbols(tl, vcc_checkuses, SYM_MAIN, SYM_SUB);
391	5666	if (tl->err)
392	80	return (tl->err);
393	5586	VCC_WalkSymbols(tl, vcc_checkpossible, SYM_MAIN, SYM_SUB);
394	5586	return (tl->err);
395	5666	}
396
397		/---------------------------------------------------------------------/
398
399		static void v_matchproto_(symwalk_f)
400	388	vcc_instance_info(struct vcc tl, const struct symbol sym)
401		{
402
403	388	CHECK_OBJ_NOTNULL(sym, SYMBOL_MAGIC);
404	388	AN(sym->rname);
405	388	Fc(tl, 0, "\t{ .p = (uintptr_t *)&%s, .name = \"", sym->rname);
406	388	VCC_SymName(tl->fc, sym);
407	388	Fc(tl, 0, "\" },\n");
408	388	}
409
410		void
411	2496	VCC_InstanceInfo(struct vcc *tl)
412		{
413	2496	Fc(tl, 0, "\nstatic const struct vpi_ii VGC_instance_info[] = {\n");
414	2496	VCC_WalkSymbols(tl, vcc_instance_info, SYM_MAIN, SYM_INSTANCE);
415	2496	Fc(tl, 0, "\t{ .p = NULL, .name = \"\" }\n");
416	2496	Fc(tl, 0, "};\n");
417	2496	}
418
419		/---------------------------------------------------------------------/
420
421		static int sym_type_len;
422
423		static void v_matchproto_(symwalk_f)
424	659068	vcc_xreftable_len(struct vcc tl, const struct symbol sym)
425		{
426		int len;
427
428	659068	(void)tl;
429	659068	CHECK_OBJ_NOTNULL(sym, SYMBOL_MAGIC);
430	659068	CHECK_OBJ_NOTNULL(sym->type, TYPE_MAGIC);
431	659068	len = strlen(sym->type->name);
432	659068	if (sym_type_len < len)
433	15588	sym_type_len = len;
434	659068	}
435
436		static void v_matchproto_(symwalk_f)
437	659068	vcc_xreftable(struct vcc tl, const struct symbol sym)
438		{
439
440	659068	CHECK_OBJ_NOTNULL(sym, SYMBOL_MAGIC);
441	659068	CHECK_OBJ_NOTNULL(sym->kind, KIND_MAGIC);
442	659068	CHECK_OBJ_NOTNULL(sym->type, TYPE_MAGIC);
443	659068	Fc(tl, 0, " * %-8s ", sym->kind->name);
444	659068	Fc(tl, 0, " %-*s ", sym_type_len, sym->type->name);
445	659068	Fc(tl, 0, " %2u %2u ", sym->lorev, sym->hirev);
446	659068	VCC_SymName(tl->fc, sym);
447	659068	if (sym->wildcard != NULL)
448	17472	Fc(tl, 0, "*");
449	659068	Fc(tl, 0, "\n");
450	659068	}
451
452		void
453	2496	VCC_XrefTable(struct vcc *tl)
454		{
455
456		#define VCC_NAMESPACE(U, l) \
457		Fc(tl, 0, "\n/\n Symbol Table " #U "\n *\n"); \
458		sym_type_len = 0; \
459		VCC_WalkSymbols(tl, vcc_xreftable_len, SYM_##U, SYM_NONE); \
460		VCC_WalkSymbols(tl, vcc_xreftable, SYM_##U, SYM_NONE); \
461		Fc(tl, 0, "*/\n\n");
462		#include "vcc_namespace.h"
463		}