/*
 * Aic7xxx SCSI host adapter firmware assembler
 *
 * Copyright (c) 1997, 1998, 2000, 2001 Justin T. Gibbs.
 * Copyright (c) 2001, 2002 Adaptec Inc.
 * All rights reserved.
 *
 * 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,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
 *
 * $Id: //depot/aic7xxx/aic7xxx/aicasm/aicasm.c#23 $
 *
 * $FreeBSD$
 */
#include <sys/types.h>
#include <sys/mman.h>

#include <ctype.h>
#include <inttypes.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>

#if linux
#include <endian.h>
#else
#include <machine/endian.h>
#endif

#include "aicasm.h"
#include "aicasm_symbol.h"
#include "aicasm_insformat.h"

typedef struct patch {
        STAILQ_ENTRY(patch) links;
        int             patch_func;
        u_int           begin;
        u_int           skip_instr;
        u_int           skip_patch;
} patch_t;

STAILQ_HEAD(patch_list, patch) patches;

static void usage(void);
static void back_patch(void);
static void output_code(void);
static void output_listing(char *ifilename);
static void dump_scope(scope_t *scope);
static void emit_patch(scope_t *scope, int patch);
static int check_patch(patch_t **start_patch, int start_instr,
                       int *skip_addr, int *func_vals);

struct path_list search_path;
int includes_search_curdir;
char *appname;
char *stock_include_file;
FILE *ofile;
char *ofilename;
char *regfilename;
FILE *regfile;
char *listfilename;
FILE *listfile;
char *regdiagfilename;
FILE *regdiagfile;
int   src_mode;
int   dst_mode;

static STAILQ_HEAD(,instruction) seq_program;
struct cs_tailq cs_tailq;
struct scope_list scope_stack;
symlist_t patch_functions;

#if DEBUG
extern int yy_flex_debug;
extern int mm_flex_debug;
extern int yydebug;
extern int mmdebug;
#endif
extern FILE *yyin;
extern int yyparse(void);

int main(int argc, char *argv[]);

int
main(int argc, char *argv[])
{
        extern char *optarg;
        extern int optind;
        int  ch;
        int  retval;
        char *inputfilename;
        scope_t *sentinal;

        STAILQ_INIT(&patches);
        SLIST_INIT(&search_path);
        STAILQ_INIT(&seq_program);
        TAILQ_INIT(&cs_tailq);
        SLIST_INIT(&scope_stack);

        /* Set Sentinal scope node */
        sentinal = scope_alloc();
        sentinal->type = SCOPE_ROOT;
        
        includes_search_curdir = 1;
        appname = *argv;
        regfile = NULL;
        listfile = NULL;
#if DEBUG
        yy_flex_debug = 0;
        mm_flex_debug = 0;
        yydebug = 0;
        mmdebug = 0;
#endif
        while ((ch = getopt(argc, argv, "d:i:l:n:o:p:r:I:")) != -1) {
                switch(ch) {
                case 'd':
#if DEBUG
                        if (strcmp(optarg, "s") == 0) {
                                yy_flex_debug = 1;
                                mm_flex_debug = 1;
                        } else if (strcmp(optarg, "p") == 0) {
                                yydebug = 1;
                                mmdebug = 1;
                        } else {
                                fprintf(stderr, "%s: -d Requires either an "
                                        "'s' or 'p' argument\n", appname);
                                usage();
                        }
#else
                        stop("-d: Assembler not built with debugging "
                             "information", EX_SOFTWARE);
#endif
                        break;
                case 'i':
                        stock_include_file = optarg;
                        break;
                case 'l':
                        /* Create a program listing */
                        if ((listfile = fopen(optarg, "w")) == NULL) {
                                perror(optarg);
                                stop(NULL, EX_CANTCREAT);
                        }
                        listfilename = optarg;
                        break;
                case 'n':
                        /* Don't complain about the -nostdinc directrive */
                        if (strcmp(optarg, "ostdinc")) {
                                fprintf(stderr, "%s: Unknown option -%c%s\n",
                                        appname, ch, optarg);
                                usage();
                                /* NOTREACHED */
                        }
                        break;
                case 'o':
                        if ((ofile = fopen(optarg, "w")) == NULL) {
                                perror(optarg);
                                stop(NULL, EX_CANTCREAT);
                        }
                        ofilename = optarg;
                        break;
                case 'p':
                        /* Create Register Diagnostic "printing" Functions */
                        if ((regdiagfile = fopen(optarg, "w")) == NULL) {
                                perror(optarg);
                                stop(NULL, EX_CANTCREAT);
                        }
                        regdiagfilename = optarg;
                        break;
                case 'r':
                        if ((regfile = fopen(optarg, "w")) == NULL) {
                                perror(optarg);
                                stop(NULL, EX_CANTCREAT);
                        }
                        regfilename = optarg;
                        break;
                case 'I':
                {
                        path_entry_t include_dir;

                        if (strcmp(optarg, "-") == 0) {
                                if (includes_search_curdir == 0) {
                                        fprintf(stderr, "%s: Warning - '-I-' "
                                                        "specified multiple "
                                                        "times\n", appname);
                                }
                                includes_search_curdir = 0;
                                for (include_dir = SLIST_FIRST(&search_path);
                                     include_dir != NULL;
                                     include_dir = SLIST_NEXT(include_dir,
                                                              links))
                                        /*
                                         * All entries before a '-I-' only
                                         * apply to includes specified with
                                         * quotes instead of "<>".
                                         */
                                        include_dir->quoted_includes_only = 1;
                        } else {
                                include_dir =
                                    (path_entry_t)malloc(sizeof(*include_dir));
                                if (include_dir == NULL) {
                                        perror(optarg);
                                        stop(NULL, EX_OSERR);
                                }
                                include_dir->directory = strdup(optarg);
                                if (include_dir->directory == NULL) {
                                        perror(optarg);
                                        stop(NULL, EX_OSERR);
                                }
                                include_dir->quoted_includes_only = 0;
                                SLIST_INSERT_HEAD(&search_path, include_dir,
                                                  links);
                        }
                        break;
                }
                case '?':
                default:
                        usage();
                        /* NOTREACHED */
                }
        }
        argc -= optind;
        argv += optind;

        if (argc != 1) {
                fprintf(stderr, "%s: No input file specifiled\n", appname);
                usage();
                /* NOTREACHED */
        }

        if (regdiagfile != NULL
         && (regfile == NULL || stock_include_file == NULL)) {
                fprintf(stderr,
                        "%s: The -p option requires the -r and -i options.\n",
                        appname);
                usage();
                /* NOTREACHED */
        }
        symtable_open();
        inputfilename = *argv;
        include_file(*argv, SOURCE_FILE);
        retval = yyparse();
        if (retval == 0) {
                if (SLIST_FIRST(&scope_stack) == NULL
                 || SLIST_FIRST(&scope_stack)->type != SCOPE_ROOT) {
                        stop("Unterminated conditional expression", EX_DATAERR);
                        /* NOTREACHED */
                }

                /* Process outmost scope */
                process_scope(SLIST_FIRST(&scope_stack));
                /*
                 * Decend the tree of scopes and insert/emit
                 * patches as appropriate.  We perform a depth first
                 * tranversal, recursively handling each scope.
                 */
                /* start at the root scope */
                dump_scope(SLIST_FIRST(&scope_stack));

                /* Patch up forward jump addresses */
                back_patch();

                if (ofile != NULL)
                        output_code();
                if (regfile != NULL)
                        symtable_dump(regfile, regdiagfile);
                if (listfile != NULL)
                        output_listing(inputfilename);
        }

        stop(NULL, 0);
        /* NOTREACHED */
        return (0);
}

static void
usage()
{

        (void)fprintf(stderr,
"usage: %-16s [-nostdinc] [-I-] [-I directory] [-o output_file]\n"
"       [-r register_output_file [-p register_diag_file -i includefile]]\n"
"       [-l program_list_file]\n"
"       input_file\n", appname);
        exit(EX_USAGE);
}

static void
back_patch()
{
        struct instruction *cur_instr;

        for (cur_instr = STAILQ_FIRST(&seq_program);
             cur_instr != NULL;
             cur_instr = STAILQ_NEXT(cur_instr, links)) {
                if (cur_instr->patch_label != NULL) {
                        struct ins_format3 *f3_instr;
                        u_int address;

                        if (cur_instr->patch_label->type != LABEL) {
                                char buf[255];

                                snprintf(buf, sizeof(buf),
                                         "Undefined label %s",
                                         cur_instr->patch_label->name);
                                stop(buf, EX_DATAERR);
                                /* NOTREACHED */
                        }
                        f3_instr = &cur_instr->format.format3;
                        address = f3_instr->address;
                        address += cur_instr->patch_label->info.linfo->address;
                        f3_instr->address = address;
                }
        }
}

static void
output_code()
{
        struct instruction *cur_instr;
        patch_t *cur_patch;
        critical_section_t *cs;
        symbol_node_t *cur_node;
        int instrcount;

        instrcount = 0;
        fprintf(ofile,
"/*\n"
" * DO NOT EDIT - This file is automatically generated\n"
" *              from the following source files:\n"
" *\n"
"%s */\n", versions);

        fprintf(ofile, "static const uint8_t seqprog[] = {\n");
        for (cur_instr = STAILQ_FIRST(&seq_program);
             cur_instr != NULL;
             cur_instr = STAILQ_NEXT(cur_instr, links)) {

                fprintf(ofile, "%s\t0x%02x, 0x%02x, 0x%02x, 0x%02x",
                        cur_instr == STAILQ_FIRST(&seq_program) ? "" : ",\n",
#ifdef __LITTLE_ENDIAN
                        cur_instr->format.bytes[0],
                        cur_instr->format.bytes[1],
                        cur_instr->format.bytes[2],
                        cur_instr->format.bytes[3]);
#else
                        cur_instr->format.bytes[3],
                        cur_instr->format.bytes[2],
                        cur_instr->format.bytes[1],
                        cur_instr->format.bytes[0]);
#endif
                instrcount++;
        }
        fprintf(ofile, "\n};\n\n");

        if (patch_arg_list == NULL)
                stop("Patch argument list not defined",
                     EX_DATAERR);

        /*
         *  Output patch information.  Patch functions first.
         */
        fprintf(ofile,
"typedef int %spatch_func_t (%s);\n", prefix, patch_arg_list);

        for (cur_node = SLIST_FIRST(&patch_functions);
             cur_node != NULL;
             cur_node = SLIST_NEXT(cur_node,links)) {
                fprintf(ofile,
"static %spatch_func_t %spatch%d_func;\n"
"\n"
"static int\n"
"%spatch%d_func(%s)\n"
"{\n"
"       return (%s);\n"
"}\n\n",
                        prefix,
                        prefix,
                        cur_node->symbol->info.condinfo->func_num,
                        prefix,
                        cur_node->symbol->info.condinfo->func_num,
                        patch_arg_list,
                        cur_node->symbol->name);
        }

        fprintf(ofile,
"static const struct patch {\n"
"       %spatch_func_t          *patch_func;\n"
"       uint32_t                 begin          :10,\n"
"                                skip_instr     :10,\n"
"                                skip_patch     :12;\n"
"} patches[] = {\n", prefix);

        for (cur_patch = STAILQ_FIRST(&patches);
             cur_patch != NULL;
             cur_patch = STAILQ_NEXT(cur_patch,links)) {
                fprintf(ofile, "%s\t{ %spatch%d_func, %d, %d, %d }",
                        cur_patch == STAILQ_FIRST(&patches) ? "" : ",\n",
                        prefix,
                        cur_patch->patch_func, cur_patch->begin,
                        cur_patch->skip_instr, cur_patch->skip_patch);
        }

        fprintf(ofile, "\n};\n\n");

        fprintf(ofile,
"static const struct cs {\n"
"       uint16_t        begin;\n"
"       uint16_t        end;\n"
"} critical_sections[] = {\n");

        for (cs = TAILQ_FIRST(&cs_tailq);
             cs != NULL;
             cs = TAILQ_NEXT(cs, links)) {
                fprintf(ofile, "%s\t{ %d, %d }",
                        cs == TAILQ_FIRST(&cs_tailq) ? "" : ",\n",
                        cs->begin_addr, cs->end_addr);
        }

        fprintf(ofile, "\n};\n\n");

        fprintf(ofile,
"static const int num_critical_sections = sizeof(critical_sections)\n"
"                                      / sizeof(*critical_sections);\n");

        fprintf(stderr, "%s: %d instructions used\n", appname, instrcount);
}

static void
dump_scope(scope_t *scope)
{
        scope_t *cur_scope;

        /*
         * Emit the first patch for this scope
         */
        emit_patch(scope, 0);

        /*
         * Dump each scope within this one.
         */
        cur_scope = TAILQ_FIRST(&scope->inner_scope);

        while (cur_scope != NULL) {

                dump_scope(cur_scope);

                cur_scope = TAILQ_NEXT(cur_scope, scope_links);
        }

        /*
         * Emit the second, closing, patch for this scope
         */
        emit_patch(scope, 1);
}

void
emit_patch(scope_t *scope, int patch)
{
        patch_info_t *pinfo;
        patch_t *new_patch;

        pinfo = &scope->patches[patch];

        if (pinfo->skip_instr == 0)
                /* No-Op patch */
                return;

        new_patch = (patch_t *)malloc(sizeof(*new_patch));

        if (new_patch == NULL)
                stop("Could not malloc patch structure", EX_OSERR);

        memset(new_patch, 0, sizeof(*new_patch));

        if (patch == 0) {
                new_patch->patch_func = scope->func_num;
                new_patch->begin = scope->begin_addr;
        } else {
                new_patch->patch_func = 0;
                new_patch->begin = scope->end_addr;
        }
        new_patch->skip_instr = pinfo->skip_instr;
        new_patch->skip_patch = pinfo->skip_patch;
        STAILQ_INSERT_TAIL(&patches, new_patch, links);
}

void
output_listing(char *ifilename)
{
        char buf[1024];
        FILE *ifile;
        struct instruction *cur_instr;
        patch_t *cur_patch;
        symbol_node_t *cur_func;
        int *func_values;
        int instrcount;
        int instrptr;
        int line;
        int func_count;
        int skip_addr;

        instrcount = 0;
        instrptr = 0;
        line = 1;
        skip_addr = 0;
        if ((ifile = fopen(ifilename, "r")) == NULL) {
                perror(ifilename);
                stop(NULL, EX_DATAERR);
        }

        /*
         * Determine which options to apply to this listing.
         */
        for (func_count = 0, cur_func = SLIST_FIRST(&patch_functions);
            cur_func != NULL;
            cur_func = SLIST_NEXT(cur_func, links))
                func_count++;

        func_values = NULL;
        if (func_count != 0) {
                func_values = (int *)malloc(func_count * sizeof(int));

                if (func_values == NULL)
                        stop("Could not malloc", EX_OSERR);
                
                func_values[0] = 0; /* FALSE func */
                func_count--;

                /*
                 * Ask the user to fill in the return values for
                 * the rest of the functions.
                 */
                
                
                for (cur_func = SLIST_FIRST(&patch_functions);
                     cur_func != NULL && SLIST_NEXT(cur_func, links) != NULL;
                     cur_func = SLIST_NEXT(cur_func, links), func_count--) {
                        int input;
                        
                        fprintf(stdout, "\n(%s)\n", cur_func->symbol->name);
                        fprintf(stdout,
                                "Enter the return value for "
                                "this expression[T/F]:");

                        while (1) {

                                input = getchar();
                                input = toupper(input);

                                if (input == 'T') {
                                        func_values[func_count] = 1;
                                        break;
                                } else if (input == 'F') {
                                        func_values[func_count] = 0;
                                        break;
                                }
                        }
                        if (isatty(fileno(stdin)) == 0)
                                putchar(input);
                }
                fprintf(stdout, "\nThanks!\n");
        }

        /* Now output the listing */
        cur_patch = STAILQ_FIRST(&patches);
        for (cur_instr = STAILQ_FIRST(&seq_program);
             cur_instr != NULL;
             cur_instr = STAILQ_NEXT(cur_instr, links), instrcount++) {

                if (check_patch(&cur_patch, instrcount,
                                &skip_addr, func_values) == 0) {
                        /* Don't count this instruction as it is in a patch
                         * that was removed.
                         */
                        continue;
                }

                while (line < cur_instr->srcline) {
                        fgets(buf, sizeof(buf), ifile);
                                fprintf(listfile, "             \t%s", buf);
                                line++;
                }
                fprintf(listfile, "%04x %02x%02x%02x%02x", instrptr,
#ifdef __LITTLE_ENDIAN
                        cur_instr->format.bytes[0],
                        cur_instr->format.bytes[1],
                        cur_instr->format.bytes[2],
                        cur_instr->format.bytes[3]);
#else
                        cur_instr->format.bytes[3],
                        cur_instr->format.bytes[2],
                        cur_instr->format.bytes[1],
                        cur_instr->format.bytes[0]);
#endif
                /*
                 * Macro expansions can cause several instructions
                 * to be output for a single source line.  Only
                 * advance the line once in these cases.
                 */
                if (line == cur_instr->srcline) {
                        fgets(buf, sizeof(buf), ifile);
                        fprintf(listfile, "\t%s", buf);
                        line++;
                } else {
                        fprintf(listfile, "\n");
                }
                instrptr++;
        }
        /* Dump the remainder of the file */
        while(fgets(buf, sizeof(buf), ifile) != NULL)
                fprintf(listfile, "             %s", buf);

        fclose(ifile);
}

static int
check_patch(patch_t **start_patch, int start_instr,
            int *skip_addr, int *func_vals)
{
        patch_t *cur_patch;

        cur_patch = *start_patch;

        while (cur_patch != NULL && start_instr == cur_patch->begin) {
                if (func_vals[cur_patch->patch_func] == 0) {
                        int skip;

                        /* Start rejecting code */
                        *skip_addr = start_instr + cur_patch->skip_instr;
                        for (skip = cur_patch->skip_patch;
                             skip > 0 && cur_patch != NULL;
                             skip--)
                                cur_patch = STAILQ_NEXT(cur_patch, links);
                } else {
                        /* Accepted this patch.  Advance to the next
                         * one and wait for our intruction pointer to
                         * hit this point.
                         */
                        cur_patch = STAILQ_NEXT(cur_patch, links);
                }
        }

        *start_patch = cur_patch;
        if (start_instr < *skip_addr)
                /* Still skipping */
                return (0);

        return (1);
}

/*
 * Print out error information if appropriate, and clean up before
 * terminating the program.
 */
void
stop(const char *string, int err_code)
{
        if (string != NULL) {
                fprintf(stderr, "%s: ", appname);
                if (yyfilename != NULL) {
                        fprintf(stderr, "Stopped at file %s, line %d - ",
                                yyfilename, yylineno);
                }
                fprintf(stderr, "%s\n", string);
        }

        if (ofile != NULL) {
                fclose(ofile);
                if (err_code != 0) {
                        fprintf(stderr, "%s: Removing %s due to error\n",
                                appname, ofilename);
                        unlink(ofilename);
                }
        }

        if (regfile != NULL) {
                fclose(regfile);
                if (err_code != 0) {
                        fprintf(stderr, "%s: Removing %s due to error\n",
                                appname, regfilename);
                        unlink(regfilename);
                }
        }

        if (listfile != NULL) {
                fclose(listfile);
                if (err_code != 0) {
                        fprintf(stderr, "%s: Removing %s due to error\n",
                                appname, listfilename);
                        unlink(listfilename);
                }
        }

        symlist_free(&patch_functions);
        symtable_close();

        exit(err_code);
}

struct instruction *
seq_alloc()
{
        struct instruction *new_instr;

        new_instr = (struct instruction *)malloc(sizeof(struct instruction));
        if (new_instr == NULL)
                stop("Unable to malloc instruction object", EX_SOFTWARE);
        memset(new_instr, 0, sizeof(*new_instr));
        STAILQ_INSERT_TAIL(&seq_program, new_instr, links);
        new_instr->srcline = yylineno;
        return new_instr;
}

critical_section_t *
cs_alloc()
{
        critical_section_t *new_cs;

        new_cs= (critical_section_t *)malloc(sizeof(critical_section_t));
        if (new_cs == NULL)
                stop("Unable to malloc critical_section object", EX_SOFTWARE);
        memset(new_cs, 0, sizeof(*new_cs));
        
        TAILQ_INSERT_TAIL(&cs_tailq, new_cs, links);
        return new_cs;
}

scope_t *
scope_alloc()
{
        scope_t *new_scope;

        new_scope = (scope_t *)malloc(sizeof(scope_t));
        if (new_scope == NULL)
                stop("Unable to malloc scope object", EX_SOFTWARE);
        memset(new_scope, 0, sizeof(*new_scope));
        TAILQ_INIT(&new_scope->inner_scope);
        
        if (SLIST_FIRST(&scope_stack) != NULL) {
                TAILQ_INSERT_TAIL(&SLIST_FIRST(&scope_stack)->inner_scope,
                                  new_scope, scope_links);
        }
        /* This patch is now the current scope */
        SLIST_INSERT_HEAD(&scope_stack, new_scope, scope_stack_links);
        return new_scope;
}

void
process_scope(scope_t *scope)
{
        /*
         * We are "leaving" this scope.  We should now have
         * enough information to process the lists of scopes
         * we encapsulate.
         */
        scope_t *cur_scope;
        u_int skip_patch_count;
        u_int skip_instr_count;

        cur_scope = TAILQ_LAST(&scope->inner_scope, scope_tailq);
        skip_patch_count = 0;
        skip_instr_count = 0;
        while (cur_scope != NULL) {
                u_int patch0_patch_skip;

                patch0_patch_skip = 0;
                switch (cur_scope->type) {
                case SCOPE_IF:
                case SCOPE_ELSE_IF:
                        if (skip_instr_count != 0) {
                                /* Create a tail patch */
                                patch0_patch_skip++;
                                cur_scope->patches[1].skip_patch =
                                    skip_patch_count + 1;
                                cur_scope->patches[1].skip_instr =
                                    skip_instr_count;
                        }

                        /* Count Head patch */
                        patch0_patch_skip++;

                        /* Count any patches contained in our inner scope */
                        patch0_patch_skip += cur_scope->inner_scope_patches;

                        cur_scope->patches[0].skip_patch = patch0_patch_skip;
                        cur_scope->patches[0].skip_instr =
                            cur_scope->end_addr - cur_scope->begin_addr;

                        skip_instr_count += cur_scope->patches[0].skip_instr;

                        skip_patch_count += patch0_patch_skip;
                        if (cur_scope->type == SCOPE_IF) {
                                scope->inner_scope_patches += skip_patch_count;
                                skip_patch_count = 0;
                                skip_instr_count = 0;
                        }
                        break;
                case SCOPE_ELSE:
                        /* Count any patches contained in our innter scope */
                        skip_patch_count += cur_scope->inner_scope_patches;

                        skip_instr_count += cur_scope->end_addr
                                          - cur_scope->begin_addr;
                        break;
                case SCOPE_ROOT:
                        stop("Unexpected scope type encountered", EX_SOFTWARE);
                        /* NOTREACHED */
                }

                cur_scope = TAILQ_PREV(cur_scope, scope_tailq, scope_links);
        }
}