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	80	* 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	80	* 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	80	* 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	80	* 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	80	* 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	80	struct token *t;
52		struct proc *fm;
53		};
54
55		struct procuse {
56		VTAILQ_ENTRY(procuse) list;
57	80	const struct token *t1;
58		const struct token *t2;
59		const struct symbol *sym;
60		const struct xrefuse *use;
61	80	unsigned mask;
62		struct proc *fm;
63		};
64
65	80	/--------------------------------------------------------------------/
66
67		static void
68	27917680	vcc_checkref(struct vcc tl, const struct symbol sym)
69	80	{
70
71	27917680	if (sym->noref)
72	24916840	return;
73	3000920	if (sym->ndef == 0 && sym->nref != 0) {
74	120	AN(sym->ref_b);
75	240	VSB_printf(tl->sb, "Undefined %s %.*s, first reference:\n",
76	120	sym->kind->name, PF(sym->ref_b));
77	120	vcc_ErrWhere(tl, sym->ref_b);
78	3000920	} else if (sym->ndef != 0 && sym->nref == 0) {
79	5080	AN(sym->def_b);
80	10160	VSB_printf(tl->sb, "Unused %s %.*s, defined:\n",
81	5080	sym->kind->name, PF(sym->def_b));
82	5080	vcc_ErrWhere(tl, sym->def_b);
83	5080	if (!tl->err_unref)
84	4840	vcc_Warn(tl);
85	5160	}
86	27917680	}
87
88		int
89	114360	vcc_CheckReferences(struct vcc *tl)
90	80	{
91
92	114360	VCC_WalkSymbols(tl, vcc_checkref, SYM_MAIN, SYM_NONE);
93	114360	return (tl->err);
94	80	}
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	80
105		void
106	7530600	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	80
111	7530600	AN(tl->curproc);
112	7530600	pu = TlAlloc(tl, sizeof *pu);
113	7530600	AN(pu);
114	7530600	AN(sym);
115	7530600	AN(use);
116	7530600	AN(use->name);
117	7530600	pu->t1 = t1;
118	7530600	pu->t2 = t2;
119	7530600	if (pu->t2 == NULL) {
120	6041480	pu->t2 = vcc_PeekTokenFrom(tl, t1);
121	6041400	AN(pu->t2);
122	6041400	}
123	7530600	pu->sym = sym;
124	7530600	pu->use = use;
125	7530600	pu->fm = tl->curproc;
126
127	7530600	if (pu->use == XREF_READ)
128	5689200	pu->mask = sym->r_methods;
129	1841400	else if (pu->use == XREF_WRITE)
130	1257880	pu->mask = sym->w_methods;
131	583520	else if (pu->use == XREF_UNSET)
132	231320	pu->mask = sym->u_methods;
133	352200	else if (pu->use == XREF_ACTION)
134	352200	pu->mask = sym->action_mask;
135		else
136	0	WRONG("wrong xref use");
137
138	7530600	VTAILQ_INSERT_TAIL(&tl->curproc->uses, pu, list);
139	7530600	}
140
141		void
142	3321920	vcc_AddCall(struct vcc tl, struct token t, struct symbol *sym)
143		{
144		struct proccall *pc;
145
146	3321920	AN(sym);
147	3321920	pc = TlAlloc(tl, sizeof *pc);
148	3321920	AN(pc);
149	3321920	pc->sym = sym;
150	3321920	pc->t = t;
151	3321920	pc->fm = tl->curproc;
152	3321920	VTAILQ_INSERT_TAIL(&tl->curproc->calls, pc, list);
153	3321920	}
154
155		void
156	2884400	vcc_ProcAction(struct proc p, unsigned returns, unsigned mask, struct token t)
157		{
158
159	2884400	assert(returns < VCL_RET_MAX);
160	2884400	p->ret_bitmap \|= (1U << returns);
161	2884400	p->okmask &= mask;
162		/* Record the first instance of this return */
163	2884400	if (p->return_tok[returns] == NULL)
164	2877200	p->return_tok[returns] = t;
165	2884400	}
166
167		static int
168	10261560	vcc_CheckActionRecurse(struct vcc tl, struct proc p, unsigned bitmap)
169		{
170		unsigned u;
171		struct proccall *pc;
172
173	10261560	AN(p);
174	10261560	if (p->active) {
175	80	VSB_cat(tl->sb, "Subroutine recurses on\n");
176	80	vcc_ErrWhere(tl, p->name);
177	80	return (1);
178		}
179	10261480	u = p->ret_bitmap & ~bitmap;
180	10261480	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	10261440	u = (p->sym->nref > p->called);
197
198	10261440	p->active = 1;
199	15849640	VTAILQ_FOREACH(pc, &p->calls, list) {
200	5588360	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	5588360	pc->sym->proc->calledfrom \|= p->calledfrom;
207	5588360	pc->sym->proc->called++;
208	5588360	pc->sym->nref += u;
209	5588360	if (vcc_CheckActionRecurse(tl, pc->sym->proc, bitmap)) {
210	320	VSB_printf(tl->sb, "\n...called from \"%.*s\"\n",
211	160	PF(p->name));
212	160	vcc_ErrWhere(tl, pc->t);
213	160	return (1);
214		}
215	5588200	p->okmask &= pc->sym->proc->okmask;
216	5588200	}
217	10261280	p->active = 0;
218	10261280	return (0);
219	10261560	}
220
221		/--------------------------------------------------------------------/
222
223		static void
224	4673200	vcc_checkaction(struct vcc tl, const struct symbol sym)
225		{
226		struct proc *p;
227		unsigned bitmap;
228
229	4673200	p = sym->proc;
230	4673200	AN(p);
231	4673200	AN(p->name);
232
233	4673200	if (p->method == NULL) {
234	2964440	bitmap = ~0U;
235	2964440	} else {
236	1708760	bitmap = p->method->ret_bitmap;
237	1708760	p->calledfrom = p->method->bitval;
238		}
239
240	4673200	if (! vcc_CheckActionRecurse(tl, p, bitmap))
241	4673080	return;
242
243	120	tl->err = 1;
244	120	if (p->method == NULL)
245	80	return;
246
247	80	VSB_printf(tl->sb,
248	40	"\n...which is the \"%s\" subroutine\n", p->method->name);
249	40	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	114000	vcc_CheckAction(struct vcc *tl)
260		{
261
262	114000	VCC_WalkSymbols(tl, vcc_checkaction, SYM_MAIN, SYM_SUB);
263	114000	return (tl->err);
264		}
265
266		/--------------------------------------------------------------------/
267
268		static struct procuse *
269	8782480	vcc_illegal_write(struct vcc tl, struct procuse pu, const struct method *m)
270		{
271
272	8782480	if (pu->mask \|\| pu->use != XREF_WRITE)
273	8781960	return (NULL);
274
275	520	if (pu->sym->r_methods == 0) {
276	40	vcc_ErrWhere2(tl, pu->t1, pu->t2);
277	40	VSB_cat(tl->sb, "Variable cannot be set.\n");
278	40	return (NULL);
279		}
280
281	480	if (!(pu->sym->r_methods & m->bitval)) {
282	80	pu->use = XREF_READ; /* NB: change the error message. */
283	80	return (pu);
284		}
285
286	400	vcc_ErrWhere2(tl, pu->t1, pu->t2);
287	400	VSB_cat(tl->sb, "Variable is read only.\n");
288	400	return (NULL);
289	8782480	}
290
291		static struct procuse *
292	14850480	vcc_FindIllegalUse(struct vcc tl, struct proc p, const struct method *m)
293		{
294	14850480	struct procuse pu, pw, *r = NULL;
295
296	44266320	VTAILQ_FOREACH(pu, &p->uses, list) {
297	29415840	p->okmask &= pu->mask;
298	29415840	if (m == NULL)
299	20633360	continue;
300	8782480	pw = vcc_illegal_write(tl, pu, m);
301	8782480	if (r != NULL)
302	280	continue;
303	8782200	if (tl->err)
304	440	r = pw;
305	8781760	else if (!(pu->mask & m->bitval))
306	1160	r = pu;
307	8782200	}
308	14850480	return (r);
309		}
310
311		static int
312	10205000	vcc_CheckUseRecurse(struct vcc tl, struct proc p,
313		const struct method *m)
314		{
315		struct proccall *pc;
316		struct procuse *pu;
317
318	10205000	pu = vcc_FindIllegalUse(tl, p, m);
319	10205000	if (pu != NULL) {
320	120	vcc_ErrWhere2(tl, pu->t1, pu->t2);
321	240	VSB_printf(tl->sb, "%s from subroutine '%s'.\n",
322	120	pu->use->err, m->name);
323	240	VSB_printf(tl->sb, "\n...in subroutine \"%.*s\"\n",
324	120	PF(pu->fm->name));
325	120	vcc_ErrWhere(tl, p->name);
326	120	return (1);
327		}
328	10204880	if (tl->err)
329	40	return (1);
330	15765600	VTAILQ_FOREACH(pc, &p->calls, list) {
331	5560960	if (vcc_CheckUseRecurse(tl, pc->sym->proc, m)) {
332	400	VSB_printf(tl->sb, "\n...called from \"%.*s\"\n",
333	200	PF(p->name));
334	200	vcc_ErrWhere(tl, pc->t);
335	200	return (1);
336		}
337	5560760	p->okmask &= pc->sym->proc->okmask;
338	5560760	}
339	10204640	return (0);
340	10205000	}
341
342		static void
343	4645480	vcc_checkuses(struct vcc tl, const struct symbol sym)
344		{
345		struct proc *p;
346		struct procuse *pu;
347
348	4645480	p = sym->proc;
349	4645480	AN(p);
350	4645480	pu = vcc_FindIllegalUse(tl, p, p->method);
351	4645480	if (pu != NULL) {
352	1040	vcc_ErrWhere2(tl, pu->t1, pu->t2);
353	2080	VSB_printf(tl->sb, "%s in subroutine '%.*s'.",
354	1040	pu->use->err, PF(p->name));
355	1040	VSB_cat(tl->sb, "\nAt: ");
356	1040	return;
357		}
358	4644440	ERRCHK(tl);
359	4644040	if (vcc_CheckUseRecurse(tl, p, p->method)) {
360	320	VSB_printf(tl->sb,
361	160	"\n...which is the \"%s\" subroutine\n", p->method->name);
362	160	return;
363		}
364	4645480	}
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	4602680	vcc_checkpossible(struct vcc tl, const struct symbol sym)
373		{
374		struct proc *p;
375
376	4602680	p = sym->proc;
377	4602680	AN(p);
378
379	4602680	if (p->okmask != 0)
380	4602600	return;
381
382	80	VSB_cat(tl->sb, "Impossible Subroutine");
383	80	vcc_ErrWhere(tl, p->name);
384	4602680	}
385
386		int
387	113880	vcc_CheckUses(struct vcc *tl)
388		{
389
390	113880	VCC_WalkSymbols(tl, vcc_checkuses, SYM_MAIN, SYM_SUB);
391	113880	if (tl->err)
392	1600	return (tl->err);
393	112280	VCC_WalkSymbols(tl, vcc_checkpossible, SYM_MAIN, SYM_SUB);
394	112280	return (tl->err);
395	113880	}
396
397		/---------------------------------------------------------------------/
398
399		static void v_matchproto_(symwalk_f)
400	7760	vcc_instance_info(struct vcc tl, const struct symbol sym)
401		{
402
403	7760	CHECK_OBJ_NOTNULL(sym, SYMBOL_MAGIC);
404	7760	AN(sym->rname);
405	7760	Fc(tl, 0, "\t{ .p = (uintptr_t *)&%s, .name = \"", sym->rname);
406	7760	VCC_SymName(tl->fc, sym);
407	7760	Fc(tl, 0, "\" },\n");
408	7760	}
409
410		void
411	50200	VCC_InstanceInfo(struct vcc *tl)
412		{
413	50200	Fc(tl, 0, "\nstatic const struct vpi_ii VGC_instance_info[] = {\n");
414	50200	VCC_WalkSymbols(tl, vcc_instance_info, SYM_MAIN, SYM_INSTANCE);
415	50200	Fc(tl, 0, "\t{ .p = NULL, .name = \"\" }\n");
416	50200	Fc(tl, 0, "};\n");
417	50200	}
418
419		/---------------------------------------------------------------------/
420
421		static int sym_type_len;
422
423		static void v_matchproto_(symwalk_f)
424	13310360	vcc_xreftable_len(struct vcc tl, const struct symbol sym)
425		{
426		int len;
427
428	13310360	(void)tl;
429	13310360	CHECK_OBJ_NOTNULL(sym, SYMBOL_MAGIC);
430	13310360	CHECK_OBJ_NOTNULL(sym->type, TYPE_MAGIC);
431	13310360	len = strlen(sym->type->name);
432	13310360	if (sym_type_len < len)
433	313600	sym_type_len = len;
434	13310360	}
435
436		static void v_matchproto_(symwalk_f)
437	13310360	vcc_xreftable(struct vcc tl, const struct symbol sym)
438		{
439
440	13310360	CHECK_OBJ_NOTNULL(sym, SYMBOL_MAGIC);
441	13310360	CHECK_OBJ_NOTNULL(sym->kind, KIND_MAGIC);
442	13310360	CHECK_OBJ_NOTNULL(sym->type, TYPE_MAGIC);
443	13310360	Fc(tl, 0, " * %-8s ", sym->kind->name);
444	13310360	Fc(tl, 0, " %-*s ", sym_type_len, sym->type->name);
445	13310360	Fc(tl, 0, " %2u %2u ", sym->lorev, sym->hirev);
446	13310360	VCC_SymName(tl->fc, sym);
447	13310360	if (sym->wildcard != NULL)
448	351400	Fc(tl, 0, "*");
449	13310360	Fc(tl, 0, "\n");
450	13310360	}
451
452		void
453	50200	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		}