+++ /dev/null
-/* ------------------------------------------------------------------------- */
-/* "linker" : For compiling and linking modules */
-/* */
-/* Copyright (c) Graham Nelson 1993 - 2018 */
-/* */
-/* This file is part of Inform. */
-/* */
-/* Inform is free software: you can redistribute it and/or modify */
-/* it under the terms of the GNU General Public License as published by */
-/* the Free Software Foundation, either version 3 of the License, or */
-/* (at your option) any later version. */
-/* */
-/* Inform is distributed in the hope that it will be useful, */
-/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
-/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
-/* GNU General Public License for more details. */
-/* */
-/* You should have received a copy of the GNU General Public License */
-/* along with Inform. If not, see https://gnu.org/licenses/ */
-/* */
-/* ------------------------------------------------------------------------- */
-
-#include "header.h"
-
-memory_block link_data_area;
-uchar *link_data_holding_area, *link_data_top;
- /* Start, current top, size of */
-int32 link_data_size; /* link data table being written */
- /* (holding import/export names) */
-extern int32 *action_symbol;
-
-/* ------------------------------------------------------------------------- */
-/* Marker values */
-/* ------------------------------------------------------------------------- */
-
-extern char *describe_mv(int mval)
-{ switch(mval)
- { case NULL_MV: return("null");
-
- /* Marker values used in ordinary story file backpatching */
-
- case DWORD_MV: return("dictionary word");
- case STRING_MV: return("string literal");
- case INCON_MV: return("system constant");
- case IROUTINE_MV: return("routine");
- case VROUTINE_MV: return("veneer routine");
- case ARRAY_MV: return("internal array");
- case NO_OBJS_MV: return("the number of objects");
- case INHERIT_MV: return("inherited common p value");
- case INDIVPT_MV: return("indiv prop table address");
- case INHERIT_INDIV_MV: return("inherited indiv p value");
- case MAIN_MV: return("ref to Main");
- case SYMBOL_MV: return("ref to symbol value");
-
- /* Additional marker values used in module backpatching */
-
- case VARIABLE_MV: return("global variable");
- case IDENT_MV: return("prop identifier number");
- case ACTION_MV: return("action");
- case OBJECT_MV: return("internal object");
-
- /* Record types in the import/export table (not really marker
- values at all) */
-
- case EXPORT_MV: return("Export ");
- case EXPORTSF_MV: return("Export sf");
- case EXPORTAC_MV: return("Export ##");
- case IMPORT_MV: return("Import ");
- }
- return("** No such MV **");
-}
-
-/* ------------------------------------------------------------------------- */
-/* Import/export records */
-/* ------------------------------------------------------------------------- */
-
-typedef struct importexport_s
-{ int module_value;
- int32 symbol_number;
- char symbol_type;
- int backpatch;
- int32 symbol_value;
- char *symbol_name;
-} ImportExport;
-
-static void describe_importexport(ImportExport *I)
-{ printf("%8s %20s %04d %04x %s\n",
- describe_mv(I->module_value), I->symbol_name,
- I->symbol_number, I->symbol_value, typename(I->symbol_type));
-}
-
-/* ========================================================================= */
-/* Linking in external modules: this code is run when the external */
-/* program hits a Link directive. */
-/* ------------------------------------------------------------------------- */
-/* This map is between global variable numbers in the module and in the */
-/* external program: variables_map[n] will be the external global variable */
-/* no for module global variable no n. (The entries [0] to [15] are not */
-/* used.) */
-/* ------------------------------------------------------------------------- */
-
-static int variables_map[256], actions_map[256];
-
-int32 module_map[16];
-
-ImportExport IE;
-
-/* ------------------------------------------------------------------------- */
-/* These are offsets within the module: */
-/* ------------------------------------------------------------------------- */
-
-static int32 m_code_offset, m_strs_offset, m_static_offset, m_dict_offset,
- m_vars_offset, m_objs_offset, m_props_offset, m_class_numbers,
- m_individuals_offset, m_individuals_length;
-
-static int m_no_objects, m_no_globals, p_no_globals, lowest_imported_global_no;
-
-int32 *xref_table; int xref_top;
-int32 *property_identifier_map;
-int *accession_numbers_map;
-int32 routine_replace[64],
- routine_replace_with[64]; int no_rr;
-
-/* ------------------------------------------------------------------------- */
-/* Reading and writing bytes/words in the module (as loaded in), indexing */
-/* via "marker addresses". */
-/* ------------------------------------------------------------------------- */
-
-static int32 read_marker_address(uchar *p, int size,
- int zmachine_area, int32 offset)
-{
- /* A routine to read the value referred to by the marker address
- (zmachine_area, offset): size is 1 for byte, 2 for word, and the
- module itself resides at p. */
-
- int32 addr = 0;
-
- switch(zmachine_area)
- {
- case DYNAMIC_ARRAY_ZA:
- addr = m_vars_offset; break;
- case ZCODE_ZA:
- addr = m_code_offset; break;
- case STATIC_STRINGS_ZA:
- addr = m_strs_offset; break;
- case DICTIONARY_ZA:
- addr = m_dict_offset; break;
- case OBJECT_TREE_ZA:
- addr = m_objs_offset; break;
- case PROP_ZA:
- addr = m_props_offset; break;
- case INDIVIDUAL_PROP_ZA:
- addr = m_individuals_offset; break;
- }
- if (size == 1) return p[addr+offset];
- return 256*p[addr+offset] + p[addr+offset+1];
-}
-
-static void write_marker_address(uchar *p, int size,
- int zmachine_area, int32 offset, int32 value)
-{
- /* Similar, but to write to it. */
-
- int32 addr = 0;
-
- switch(zmachine_area)
- {
- case DYNAMIC_ARRAY_ZA:
- addr = m_vars_offset; break;
- case ZCODE_ZA:
- addr = m_code_offset; break;
- case STATIC_STRINGS_ZA:
- addr = m_strs_offset; break;
- case DICTIONARY_ZA:
- addr = m_dict_offset; break;
- case OBJECT_TREE_ZA:
- addr = m_objs_offset; break;
- case PROP_ZA:
- addr = m_props_offset; break;
- case INDIVIDUAL_PROP_ZA:
- addr = m_individuals_offset; break;
- }
- if (size == 1) { p[addr+offset] = value%256; return; }
- p[addr+offset] = value/256;
- p[addr+offset+1] = value%256;
-}
-
-int m_read_pos;
-
-static int get_next_record(uchar *p)
-{ int i;
- int record_type = p[m_read_pos++];
- switch(record_type)
- { case 0: break;
- case EXPORT_MV:
- case EXPORTSF_MV:
- case EXPORTAC_MV:
- case IMPORT_MV:
- IE.module_value = record_type;
- i=p[m_read_pos++]; IE.symbol_number = 256*i + p[m_read_pos++];
- IE.symbol_type = p[m_read_pos++];
- if (record_type != IMPORT_MV) IE.backpatch = p[m_read_pos++];
- i=p[m_read_pos++]; IE.symbol_value = 256*i + p[m_read_pos++];
- IE.symbol_name = (char *) (p+m_read_pos);
- m_read_pos += strlen((char *) (p+m_read_pos))+1;
- if (linker_trace_level >= 2) describe_importexport(&IE);
- break;
- default:
- printf("Marker value of %d\n", record_type);
- compiler_error("Link: illegal import/export marker value");
- return -1;
- }
- return record_type;
-}
-
-static char link_errorm[128];
-
-static void accept_export(void)
-{ int32 index, map_to = IE.symbol_value % 0x10000;
- index = symbol_index(IE.symbol_name, -1);
-
- xref_table[IE.symbol_number] = index;
-
- if (!(sflags[index] & UNKNOWN_SFLAG))
- { if (IE.module_value == EXPORTAC_MV)
- { if ((!(sflags[index] & ACTION_SFLAG))
- && (stypes[index] != FAKE_ACTION_T))
- link_error_named(
-"action name clash with", IE.symbol_name);
- }
- else
- if (stypes[index] == IE.symbol_type)
- { switch(IE.symbol_type)
- { case CONSTANT_T:
- if ((!(svals[index] == IE.symbol_value))
- || (IE.backpatch != 0))
- link_error_named(
-"program and module give differing values of", IE.symbol_name);
- break;
- case INDIVIDUAL_PROPERTY_T:
- property_identifier_map[IE.symbol_value] = svals[index];
- break;
- case ROUTINE_T:
- if ((IE.module_value == EXPORTSF_MV)
- && (sflags[index] & REPLACE_SFLAG))
- break;
- default:
- sprintf(link_errorm,
- "%s '%s' in both program and module",
- typename(IE.symbol_type), IE.symbol_name);
- link_error(link_errorm);
- break;
- }
- }
- else
- { sprintf(link_errorm,
- "'%s' has type %s in program but type %s in module",
- IE.symbol_name, typename(stypes[index]),
- typename(IE.symbol_type));
- link_error(link_errorm);
- }
- }
- else
- { if (IE.module_value == EXPORTAC_MV)
- { IE.symbol_value = no_actions;
- action_symbol[no_actions++] = index;
- if (linker_trace_level >= 4)
- printf("Creating action ##%s\n", (char *) symbs[index]);
- }
- else
- switch(IE.symbol_type)
- { case ROUTINE_T:
- if ((IE.module_value == EXPORTSF_MV)
- && (sflags[index] & REPLACE_SFLAG))
- { routine_replace[no_rr] = IE.symbol_value;
- routine_replace_with[no_rr++] = index;
- return;
- }
- IE.symbol_value += (zmachine_pc/scale_factor);
- break;
- case OBJECT_T:
- case CLASS_T:
- IE.symbol_value += no_objects;
- break;
- case ARRAY_T:
- IE.symbol_value += dynamic_array_area_size - (MAX_GLOBAL_VARIABLES*2);
- break;
- case GLOBAL_VARIABLE_T:
- if (no_globals==233)
- { link_error(
-"failed because too many extra global variables needed");
- return;
- }
- variables_map[16 + m_no_globals++] = 16 + no_globals;
- set_variable_value(no_globals, IE.symbol_value);
- IE.symbol_value = 16 + no_globals++;
- break;
- case INDIVIDUAL_PROPERTY_T:
- property_identifier_map[IE.symbol_value]
- = no_individual_properties;
- IE.symbol_value = no_individual_properties++;
-
- if (debugfile_switch)
- { debug_file_printf("<property>");
- debug_file_printf
- ("<identifier>%s</identifier>", IE.symbol_name);
- debug_file_printf
- ("<value>%d</value>", IE.symbol_value);
- debug_file_printf("</property>");
- }
-
- break;
- }
- assign_symbol(index, IE.backpatch*0x10000 + IE.symbol_value,
- IE.symbol_type);
- if (IE.backpatch != 0) sflags[index] |= CHANGE_SFLAG;
- sflags[index] |= EXPORT_SFLAG;
- if (IE.module_value == EXPORTSF_MV)
- sflags[index] |= INSF_SFLAG;
- if (IE.module_value == EXPORTAC_MV)
- sflags[index] |= ACTION_SFLAG;
- }
-
- if (IE.module_value == EXPORTAC_MV)
- { if (linker_trace_level >= 4)
- printf("Map %d '%s' to %d\n",
- IE.symbol_value, (char *) (symbs[index]), svals[index]);
- actions_map[map_to] = svals[index];
- }
-}
-
-static void accept_import(void)
-{ int32 index;
-
- index = symbol_index(IE.symbol_name, -1);
- sflags[index] |= USED_SFLAG;
- xref_table[IE.symbol_number] = index;
-
- if (!(sflags[index] & UNKNOWN_SFLAG))
- { switch (IE.symbol_type)
- {
- case GLOBAL_VARIABLE_T:
- if (stypes[index] != GLOBAL_VARIABLE_T)
- link_error_named(
-"module (wrongly) declared this a variable:", IE.symbol_name);
- variables_map[IE.symbol_value] = svals[index];
- if (IE.symbol_value < lowest_imported_global_no)
- lowest_imported_global_no = IE.symbol_value;
- break;
- default:
- switch(stypes[index])
- { case ATTRIBUTE_T:
- link_error_named(
-"this attribute is undeclared within module:", IE.symbol_name);; break;
- case PROPERTY_T:
- link_error_named(
-"this property is undeclared within module:", IE.symbol_name); break;
- case INDIVIDUAL_PROPERTY_T:
- case ARRAY_T:
- case ROUTINE_T:
- case CONSTANT_T:
- case OBJECT_T:
- case CLASS_T:
- case FAKE_ACTION_T:
- break;
- default:
- link_error_named(
-"this was referred to as a constant, but isn't:", IE.symbol_name);
- break;
- }
- break;
- }
- }
- else
- { switch (IE.symbol_type)
- {
- case GLOBAL_VARIABLE_T:
- if (stypes[index] != GLOBAL_VARIABLE_T)
- link_error_named(
- "Module tried to import a Global variable not defined here:",
- IE.symbol_name);
- variables_map[IE.symbol_value] = 16;
- if (IE.symbol_value < lowest_imported_global_no)
- lowest_imported_global_no = IE.symbol_value;
- break;
- }
- }
-}
-
-static int32 backpatch_backpatch(int32 v)
-{ switch(backpatch_marker)
- {
- /* Backpatches made now which are final */
-
- case OBJECT_MV:
- v += no_objects;
- backpatch_marker = NULL_MV;
- break;
-
- case ACTION_MV:
- if ((v<0) || (v>=256) || (actions_map[v] == -1))
- { link_error("unmapped action number");
- printf("*** Link: unmapped action number %d ***", v);
- v = 0;
- break;
- }
- v = actions_map[v];
- backpatch_marker = NULL_MV;
- break;
-
- case IDENT_MV:
- { int f = v & 0x8000;
- v = f + property_identifier_map[v-f];
- backpatch_marker = NULL_MV;
- break;
- }
-
- case VARIABLE_MV:
- backpatch_marker = NULL_MV;
- if (v < lowest_imported_global_no)
- { v = v + p_no_globals; break;
- }
- if (variables_map[v] == -1)
- { printf("** Unmapped variable %d! **\n", v);
- variables_map[v] = 16;
- link_error("unmapped variable error"); break;
- }
- v = variables_map[v];
- break;
-
- /* Backpatch values which are themselves being backpatched */
-
- case INDIVPT_MV:
- v += individuals_length;
- break;
-
- case SYMBOL_MV:
- v = xref_table[v];
- if ((v<0) || (v>=no_symbols))
- { printf("** Symbol number %d cannot be crossreferenced **\n", v);
- link_error("symbol crossreference error"); v=0;
- break;
- }
- break;
-
- case STRING_MV:
- v += static_strings_extent/scale_factor;
- break;
-
- case IROUTINE_MV:
- { int i;
- for (i=0;i<no_rr;i++)
- if (v == routine_replace[i])
- { v = routine_replace_with[i];
- backpatch_marker = SYMBOL_MV;
- goto IR_Done;
- }
- v += zmachine_pc/scale_factor;
- }
- IR_Done: break;
-
- case VROUTINE_MV:
- veneer_routine(v);
- break;
-
- case ARRAY_MV:
- if (v < (MAX_GLOBAL_VARIABLES*2))
- { v = 2*(variables_map[v/2 + 16] - 16);
- }
- else
- { v += dynamic_array_area_size - (MAX_GLOBAL_VARIABLES*2);
- }
- break;
-
- case DWORD_MV:
- v = accession_numbers_map[v];
- break;
-
- case INHERIT_MV:
- v += properties_table_size;
- break;
-
- case INHERIT_INDIV_MV:
- v += individuals_length;
- break;
- }
- return v;
-}
-
-static void backpatch_module_image(uchar *p,
- int marker_value, int zmachine_area, int32 offset)
-{ int size = (marker_value>=0x80)?1:2; int32 v;
- marker_value &= 0x7f;
-
- backpatch_marker = marker_value;
-
- if (zmachine_area == PROP_DEFAULTS_ZA) return;
-
- if (linker_trace_level >= 3)
- printf("Backpatch %s area %d offset %04x size %d: ",
- describe_mv(marker_value), zmachine_area, offset, size);
-
- v = read_marker_address(p, size, zmachine_area, offset);
- if (linker_trace_level >= 3) printf("%04x ", v);
-
- v = backpatch_backpatch(v);
-
- write_marker_address(p, size, zmachine_area, offset, v);
- if (linker_trace_level >= 3) printf("%04x\n", v);
-}
-
-/* ------------------------------------------------------------------------- */
-/* The main routine: linking in a module with the given filename. */
-/* ------------------------------------------------------------------------- */
-
-char current_module_filename[128];
-
-void link_module(char *given_filename)
-{ FILE *fin;
- int record_type;
- char filename[128];
- uchar *p, p0[64];
- int32 last, i, j, k, l, m, vn, len, size, link_offset, module_size, map,
- max_property_identifier, symbols_base = no_symbols;
-
- strcpy(current_module_filename, given_filename);
-
- /* (1) Load in the module to link */
-
- i = 0;
- do
- { i = translate_link_filename(i, filename, given_filename);
- fin=fopen(filename,"rb");
- } while ((fin == NULL) && (i != 0));
-
- if (fin==NULL)
- { error_named("Couldn't open module file", filename); return;
- }
-
- for (i=0;i<64;i++) p0[i]=fgetc(fin);
-
- vn = p0[0];
- if ((vn<65) || (vn>75))
- { error_named("File isn't a module:", filename);
- fclose(fin); return;
- }
-
- if (vn != 64 + version_number)
- { char ebuff[100];
- sprintf(ebuff,
- "module compiled as Version %d (so it can't link\
- into this V%d game):", vn-64, version_number);
- error_named(ebuff, filename);
- fclose(fin); return;
- }
-
- module_size = (256*p0[26] + p0[27])*scale_factor;
- p = my_malloc(module_size + 16, "link module storage");
- /* The + 16 allows for rounding errors */
-
- for (k=0;k<64;k++) p[k] = p0[k];
- for (k=64;k<module_size;k++) p[k] = fgetc(fin);
- fclose(fin);
-
- if ((p0[52] != 0) || (p0[53] != 0))
- { /* Then the module contains a character set table */
- if (alphabet_modified)
- { k = FALSE; m = 256*p0[52] + p0[53];
- for (i=0;i<3;i++) for (j=0;j<26;j++)
- { l = alphabet[i][j]; if (l == '~') l = '\"';
- if (l != p[m]) k = TRUE;
- }
- if (k)
- link_error("module and game both define non-standard character sets, \
-but they disagree");
- k = FALSE;
- }
- else k = TRUE;
- }
- else
- { if (alphabet_modified) k = TRUE;
- else k = FALSE;
- }
- if (k)
- link_error("module and game use different character sets");
-
- i = p[1];
- if (i > MODULE_VERSION_NUMBER)
- warning_named("module has a more advanced format than this release \
-of the Inform 6 compiler knows about: it may not link in correctly", filename);
-
- /* (2) Calculate offsets: see the header-writing code in "tables.c" */
-
- map = (256*p[6] + p[7]);
- for (i=0; i<16; i++) module_map[i] = 256*p[map + i*2] + p[map + i*2 + 1];
-
- m_vars_offset = (256*p[12] + p[13]);
- m_static_offset = (256*p[14] + p[15]);
- m_dict_offset = (256*p[8] + p[9]);
- m_code_offset = (256*p[4] + p[5]);
-
- /* (3) Read the "module map" table */
-
- if (linker_trace_level>=4)
- { printf("[Reading module map:\n");
- for (i=0; i<16; i++) printf("%04x ", module_map[i]);
- printf("]\n");
- }
-
- m_objs_offset = module_map[0];
- m_props_offset = module_map[1];
- m_strs_offset = scale_factor*module_map[2];
- m_class_numbers = module_map[3];
- m_individuals_offset = module_map[4];
- m_individuals_length = module_map[5];
-
- for (i=16;i<256;i++) variables_map[i] = -1;
- for (i=0;i<16;i++) variables_map[i] = i;
- for (i=LOWEST_SYSTEM_VAR_NUMBER;i<256;i++) variables_map[i] = i;
-
- for (i=0;i<256;i++) actions_map[i] = -1;
-
- xref_table = my_calloc(sizeof(int32), module_map[6],
- "linker cross-references table");
- for (i=0;i<module_map[6];i++) xref_table[i] = -1;
-
- max_property_identifier = module_map[7];
- property_identifier_map = my_calloc(sizeof(int32), max_property_identifier,
- "property identifier map");
- for (i=0; i<max_property_identifier; i++)
- property_identifier_map[i] = i;
-
- m_no_objects = module_map[8];
- link_offset = module_map[9];
-
- m_no_globals = 0; p_no_globals = no_globals;
- lowest_imported_global_no=236;
-
- no_rr = 0;
-
- if ((linker_trace_level>=1) || transcript_switch)
- { char link_banner[128];
- sprintf(link_banner,
- "[Linking release %d.%c%c%c%c%c%c of module '%s' (size %dK)]",
- p[2]*256 + p[3], p[18], p[19], p[20], p[21], p[22], p[23],
- filename, module_size/1024);
- if (linker_trace_level >= 1) printf("%s\n", link_banner);
- if (transcript_switch)
- write_to_transcript_file(link_banner);
- }
-
- /* (4) Merge in the dictionary */
-
- if (linker_trace_level >= 2)
- printf("Merging module's dictionary at %04x\n", m_dict_offset);
- k=m_dict_offset; k+=p[k]+1;
- len=p[k++];
- size = p[k]*256 + p[k+1]; k+=2;
-
- accession_numbers_map = my_calloc(sizeof(int), size,
- "dictionary accession numbers map");
-
- for (i=0;i<size;i++, k+=len)
- { char word[10];
- word_to_ascii(p+k,word);
- if (linker_trace_level >= 3)
- printf("%03d %04x '%s' %02x %02x %02x\n",i,k,
- word, p[k+len-3], p[k+len-2], p[k+len-1]);
-
- accession_numbers_map[i]
- = dictionary_add(word, p[k+len-3], p[k+len-2], p[k+len-1]);
- }
-
- /* (5) Run through import/export table */
-
- m_read_pos = module_map[9];
- if (linker_trace_level>=2)
- printf("Import/export table is at byte offset %04x\n", m_read_pos);
-
- do
- { record_type = get_next_record(p);
- if (((record_type == EXPORT_MV) || (record_type == EXPORTSF_MV))
- && (IE.symbol_type == INDIVIDUAL_PROPERTY_T))
- { int32 si = symbol_index(IE.symbol_name, -1);
- property_identifier_map[IE.symbol_value] = svals[si];
- }
- switch(record_type)
- { case EXPORT_MV:
- case EXPORTSF_MV:
- case EXPORTAC_MV:
- accept_export(); break;
- case IMPORT_MV:
- accept_import(); break;
- }
- } while (record_type != 0);
-
- if ((linker_trace_level >= 4) && (no_rr != 0))
- { printf("Replaced routine addresses:\n");
- for (i=0; i<no_rr; i++)
- { printf("Replace code offset %04x with %04x\n",
- routine_replace[i], routine_replace_with[i]);
- }
- }
-
- if (linker_trace_level >= 4)
- { printf("Symbol cross-references table:\n");
- for (i=0; i<module_map[6]; i++)
- { if (xref_table[i] != -1)
- printf("module %4d -> story file '%s'\n", i,
- (char *) symbs[xref_table[i]]);
- }
- }
-
- if (linker_trace_level >= 4)
- { printf("Action numbers map:\n");
- for (i=0; i<256; i++)
- if (actions_map[i] != -1)
- printf("%3d -> %3d\n", i, actions_map[i]);
- }
-
- if ((linker_trace_level >= 4) && (max_property_identifier > 72))
- { printf("Property identifier number map:\n");
- for (i=72; i<max_property_identifier; i++)
- { printf("module %04x -> program %04x\n",
- i, property_identifier_map[i]);
- }
- }
-
- /* (6) Backpatch the backpatch markers attached to exported symbols */
-
- for (i=symbols_base; i<no_symbols; i++)
- { if ((sflags[i] & CHANGE_SFLAG) && (sflags[i] & EXPORT_SFLAG))
- { backpatch_marker = svals[i]/0x10000;
- j = svals[i] % 0x10000;
-
- j = backpatch_backpatch(j);
-
- svals[i] = backpatch_marker*0x10000 + j;
- if (backpatch_marker == 0) sflags[i] &= (~(CHANGE_SFLAG));
- }
- }
-
- /* (7) Run through the Z-code backpatch table */
-
- for (i=module_map[11]; i<module_map[11]+module_map[12]; i += 3)
- { int marker_value = p[i];
- int32 offset = 256*p[i+1] + p[i+2];
-
- switch(marker_value & 0x7f)
- { case OBJECT_MV:
- case ACTION_MV:
- case IDENT_MV:
- case VARIABLE_MV:
- backpatch_module_image(p, marker_value, ZCODE_ZA, offset);
- break;
- default:
- backpatch_module_image(p, marker_value, ZCODE_ZA, offset);
- write_byte_to_memory_block(&zcode_backpatch_table,
- zcode_backpatch_size++, backpatch_marker);
- write_byte_to_memory_block(&zcode_backpatch_table,
- zcode_backpatch_size++, (offset + zmachine_pc)/256);
- write_byte_to_memory_block(&zcode_backpatch_table,
- zcode_backpatch_size++, (offset + zmachine_pc)%256);
- break;
- }
- }
-
- /* (8) Run through the Z-machine backpatch table */
-
- for (i=module_map[13]; i<module_map[13]+module_map[14]; i += 4)
- { int marker_value = p[i], zmachine_area = p[i+1];
- int32 offset = 256*p[i+2] + p[i+3];
-
- switch(marker_value)
- { case OBJECT_MV:
- case ACTION_MV:
- case IDENT_MV:
- backpatch_module_image(p, marker_value, zmachine_area, offset);
- break;
- default:
- backpatch_module_image(p, marker_value, zmachine_area, offset);
- switch(zmachine_area)
- { case PROP_DEFAULTS_ZA:
- break;
- case PROP_ZA:
- offset += properties_table_size; break;
- case INDIVIDUAL_PROP_ZA:
- offset += individuals_length; break;
- case DYNAMIC_ARRAY_ZA:
- if (offset < (MAX_GLOBAL_VARIABLES*2))
- { offset = 2*(variables_map[offset/2 + 16] - 16);
- }
- else
- { offset += dynamic_array_area_size - (MAX_GLOBAL_VARIABLES*2);
- }
- break;
- }
- backpatch_zmachine(backpatch_marker, zmachine_area, offset);
- break;
- }
- }
-
- /* (9) Adjust initial values of variables */
-
- if (linker_trace_level >= 3)
- printf("\nFinal variables map, Module -> Main:\n");
-
- for (i=16;i<255;i++)
- if (variables_map[i]!=-1)
- { if (linker_trace_level>=2)
- printf("%d->%d ",i,variables_map[i]);
- if (i<lowest_imported_global_no)
- { int32 j = read_marker_address(p, 2,
- DYNAMIC_ARRAY_ZA, 2*(i-16));
- set_variable_value(variables_map[i]-16, j);
- if (linker_trace_level>=2)
- printf("(set var %d to %d) ",
- variables_map[i], j);
- }
- }
- if (linker_trace_level>=2) printf("\n");
-
- /* (10) Glue in the dynamic array data */
-
- i = m_static_offset - m_vars_offset - MAX_GLOBAL_VARIABLES*2;
- if (dynamic_array_area_size + i >= MAX_STATIC_DATA)
- memoryerror("MAX_STATIC_DATA", MAX_STATIC_DATA);
-
- if (linker_trace_level >= 2)
- printf("Inserting dynamic array area, %04x to %04x, at %04x\n",
- m_vars_offset + MAX_GLOBAL_VARIABLES*2, m_static_offset,
- variables_offset + dynamic_array_area_size);
- for (k=0;k<i;k++)
- { dynamic_array_area[dynamic_array_area_size+k]
- = p[m_vars_offset+MAX_GLOBAL_VARIABLES*2+k];
- }
- dynamic_array_area_size+=i;
-
- /* (11) Glue in the code area */
-
- if (linker_trace_level >= 2)
- printf("Inserting code area, %04x to %04x, at code offset %04x (+%04x)\n",
- m_code_offset, m_strs_offset, code_offset, zmachine_pc);
-
- for (k=m_code_offset;k<m_strs_offset;k++)
- { if (temporary_files_switch)
- { fputc(p[k],Temp2_fp);
- zmachine_pc++;
- }
- else
- write_byte_to_memory_block(&zcode_area, zmachine_pc++, p[k]);
- }
-
- /* (12) Glue in the static strings area */
-
- if (linker_trace_level >= 2)
- printf("Inserting strings area, %04x to %04x, \
-at strings offset %04x (+%04x)\n",
- m_strs_offset, link_offset, strings_offset,
- static_strings_extent);
- for (k=m_strs_offset;k<link_offset;k++)
- { if (temporary_files_switch)
- { fputc(p[k], Temp1_fp);
- static_strings_extent++;
- }
- else
- write_byte_to_memory_block(&static_strings_area,
- static_strings_extent++, p[k]);
- }
-
- /* (13) Append the class object-numbers table: note that modules
- provide extra information in this table */
-
- i = m_class_numbers;
- do
- { j = p[i]*256 + p[i+1]; i+=2;
- if (j == 0) break;
-
- class_object_numbers[no_classes] = j + no_objects;
- j = p[i]*256 + p[i+1]; i+=2;
- class_begins_at[no_classes++] = j + properties_table_size;
-
- } while (TRUE);
-
- /* (14) Glue on the object tree */
-
- if ((linker_trace_level>=2) && (m_no_objects>0))
- printf("Joining on object tree of size %d\n", m_no_objects);
-
- for (i=0, k=no_objects, last=m_props_offset;i<m_no_objects;i++)
- { objectsz[no_objects].atts[0]=p[m_objs_offset+14*i];
- objectsz[no_objects].atts[1]=p[m_objs_offset+14*i+1];
- objectsz[no_objects].atts[2]=p[m_objs_offset+14*i+2];
- objectsz[no_objects].atts[3]=p[m_objs_offset+14*i+3];
- objectsz[no_objects].atts[4]=p[m_objs_offset+14*i+4];
- objectsz[no_objects].atts[5]=p[m_objs_offset+14*i+5];
- objectsz[no_objects].parent =
- (p[m_objs_offset+14*i+6])*256+p[m_objs_offset+14*i+7];
- objectsz[no_objects].next =
- (p[m_objs_offset+14*i+8])*256+p[m_objs_offset+14*i+9];
- objectsz[no_objects].child =
- (p[m_objs_offset+14*i+10])*256+p[m_objs_offset+14*i+11];
- if (linker_trace_level>=4)
- printf("Module objects[%d] has %d,%d,%d\n",
- i,objectsz[no_objects].parent,
- objectsz[no_objects].next,objectsz[no_objects].child);
- if (objectsz[no_objects].parent == 0x7fff)
- { objectsz[no_objects].parent = 1;
- if (objectsz[1].child == 0)
- { objectsz[1].child = no_objects+1;
- }
- else
- { int j1 = 0, j2 = objectsz[1].child;
- while (j2 != 0)
- { j1 = j2;
- j2 = objectsz[j2].next;
- }
- objectsz[j1].next = no_objects+1;
- }
- objectsz[no_objects].next = 0;
- }
- else
- if (objectsz[no_objects].parent>0) objectsz[no_objects].parent += k;
- if (objectsz[no_objects].next>0) objectsz[no_objects].next += k;
- if (objectsz[no_objects].child>0) objectsz[no_objects].child += k;
- objectsz[no_objects].propsize =
- (p[m_objs_offset+14*i+12])*256+p[m_objs_offset+14*i+13];
- last += objectsz[no_objects].propsize;
- if (linker_trace_level>=4)
- printf("Objects[%d] has %d,%d,%d\n",
- no_objects,objectsz[no_objects].parent,
- objectsz[no_objects].next,objectsz[no_objects].child);
- no_objects++;
- }
-
- /* (15) Glue on the properties */
-
- if (last>m_props_offset)
- { i = m_static_offset - m_vars_offset - MAX_GLOBAL_VARIABLES*2;
- if (dynamic_array_area_size + i >= MAX_STATIC_DATA)
- memoryerror("MAX_STATIC_DATA", MAX_STATIC_DATA);
-
- if (linker_trace_level >= 2)
- printf("Inserting object properties area, %04x to %04x, at +%04x\n",
- m_props_offset, last, properties_table_size);
- for (k=0;k<last-m_props_offset;k++)
- properties_table[properties_table_size++] = p[m_props_offset+k];
- }
-
- /* (16) Bitwise OR Flags 2 (Z-machine requirements flags) */
-
- j = p[16]*256 + p[17];
- for (i=0, k=1;i<16;i++, k=k*2) flags2_requirements[i] |= ((j/k)%2);
-
- /* (17) Append the individual property values table */
-
- i = m_individuals_length;
- if (individuals_length + i >= MAX_INDIV_PROP_TABLE_SIZE)
- memoryerror("MAX_INDIV_PROP_TABLE_SIZE",
- MAX_INDIV_PROP_TABLE_SIZE);
-
- if (linker_trace_level >= 2)
- printf("Inserting individual prop tables area, %04x to %04x, at +%04x\n",
- m_individuals_offset, m_individuals_offset + i,
- individuals_length);
- for (k=0;k<i;k++)
- { individuals_table[individuals_length + k]
- = p[m_individuals_offset + k];
- }
- individuals_length += i;
-
- /* (18) All done */
-
- if (linker_trace_level >= 2)
- printf("Link complete\n");
-
- my_free(&p, "link module storage");
- my_free(&xref_table, "linker cross-references table");
- my_free(&property_identifier_map, "property identifier map");
- my_free(&accession_numbers_map, "accession numbers map");
-}
-
-/* ========================================================================= */
-/* Writing imports, exports and markers to the link data table during */
-/* module compilation */
-/* ------------------------------------------------------------------------- */
-/* Writing to the link data table */
-/* ------------------------------------------------------------------------- */
-
-static void write_link_byte(int x)
-{ *link_data_top=(unsigned char) x; link_data_top++; link_data_size++;
- if (subtract_pointers(link_data_top,link_data_holding_area)
- >= MAX_LINK_DATA_SIZE)
- { memoryerror("MAX_LINK_DATA_SIZE",MAX_LINK_DATA_SIZE);
- }
-}
-
-extern void flush_link_data(void)
-{ int32 i, j;
- j = subtract_pointers(link_data_top, link_data_holding_area);
- if (temporary_files_switch)
- for (i=0;i<j;i++) fputc(link_data_holding_area[i], Temp3_fp);
- else
- for (i=0;i<j;i++)
- write_byte_to_memory_block(&link_data_area, link_data_size-j+i,
- link_data_holding_area[i]);
- link_data_top=link_data_holding_area;
-}
-
-static void write_link_word(int32 x)
-{ write_link_byte(x/256); write_link_byte(x%256);
-}
-
-static void write_link_string(char *s)
-{ int i;
- for (i=0; s[i]!=0; i++) write_link_byte(s[i]);
- write_link_byte(0);
-}
-
-/* ------------------------------------------------------------------------- */
-/* Exports and imports */
-/* ------------------------------------------------------------------------- */
-
-static void export_symbols(void)
-{ int symbol_number;
-
- for (symbol_number = 0; symbol_number < no_symbols; symbol_number++)
- { int export_flag = FALSE, import_flag = FALSE;
-
- if (stypes[symbol_number]==GLOBAL_VARIABLE_T)
- { if (svals[symbol_number] < LOWEST_SYSTEM_VAR_NUMBER)
- { if (sflags[symbol_number] & IMPORT_SFLAG)
- import_flag = TRUE;
- else
- if (!(sflags[symbol_number] & SYSTEM_SFLAG))
- export_flag = TRUE;
- }
- }
- else
- { if (!(sflags[symbol_number] & SYSTEM_SFLAG))
- { if (sflags[symbol_number] & UNKNOWN_SFLAG)
- { if (sflags[symbol_number] & IMPORT_SFLAG)
- import_flag = TRUE;
- }
- else
- switch(stypes[symbol_number])
- { case LABEL_T:
- case ATTRIBUTE_T:
- case PROPERTY_T:
- /* Ephemera */
- break;
-
- default: export_flag = TRUE;
- }
- }
- }
-
- if (export_flag)
- { if (linker_trace_level >= 1)
- { IE.module_value = EXPORT_MV;
- IE.symbol_number = symbol_number;
- IE.symbol_type = stypes[symbol_number];
- IE.symbol_value = svals[symbol_number];
- IE.symbol_name = (char *) (symbs[symbol_number]);
- describe_importexport(&IE);
- }
-
- if (sflags[symbol_number] & ACTION_SFLAG)
- write_link_byte(EXPORTAC_MV);
- else
- if (sflags[symbol_number] & INSF_SFLAG)
- write_link_byte(EXPORTSF_MV);
- else
- write_link_byte(EXPORT_MV);
-
- write_link_word(symbol_number);
- write_link_byte(stypes[symbol_number]);
- if (sflags[symbol_number] & CHANGE_SFLAG)
- write_link_byte(svals[symbol_number] / 0x10000);
- else write_link_byte(0);
- write_link_word(svals[symbol_number] % 0x10000);
- write_link_string((char *) (symbs[symbol_number]));
- flush_link_data();
- }
-
- if (import_flag)
- { if (linker_trace_level >= 1)
- { IE.module_value = IMPORT_MV;
- IE.symbol_number = symbol_number;
- IE.symbol_type = stypes[symbol_number];
- IE.symbol_value = svals[symbol_number];
- IE.symbol_name = (char *) (symbs[symbol_number]);
- describe_importexport(&IE);
- }
-
- write_link_byte(IMPORT_MV);
- write_link_word(symbol_number);
- write_link_byte(stypes[symbol_number]);
- write_link_word(svals[symbol_number]);
- write_link_string((char *) (symbs[symbol_number]));
- flush_link_data();
- }
- }
-}
-
-/* ------------------------------------------------------------------------- */
-/* Marking for later importation */
-/* ------------------------------------------------------------------------- */
-
-int mv_vref=LOWEST_SYSTEM_VAR_NUMBER-1;
-
-void import_symbol(int32 symbol_number)
-{ sflags[symbol_number] |= IMPORT_SFLAG;
- switch(stypes[symbol_number])
- { case GLOBAL_VARIABLE_T:
- assign_symbol(symbol_number, mv_vref--, stypes[symbol_number]);
- break;
- }
-}
-
-/* ========================================================================= */
-/* Data structure management routines */
-/* ------------------------------------------------------------------------- */
-
-extern void init_linker_vars(void)
-{ link_data_size = 0;
- initialise_memory_block(&link_data_area);
-}
-
-extern void linker_begin_pass(void)
-{ link_data_top = link_data_holding_area;
-}
-
-extern void linker_endpass(void)
-{ export_symbols();
- write_link_byte(0);
- flush_link_data();
-}
-
-extern void linker_allocate_arrays(void)
-{ if (!module_switch)
- link_data_holding_area
- = my_malloc(64, "link data holding area");
- else
- link_data_holding_area
- = my_malloc(MAX_LINK_DATA_SIZE, "link data holding area");
-}
-
-extern void linker_free_arrays(void)
-{ my_free(&link_data_holding_area, "link data holding area");
- deallocate_memory_block(&link_data_area);
-}
-
-/* ========================================================================= */
projects / inform.git / blobdiff