489 lines
12 KiB
C
489 lines
12 KiB
C
/*
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* Copyright (c) 1987 Fujitsu
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/*
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lookups.c -- Routines to lookup things in tables.
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Chip Morningstar -- Lucasfilm Ltd.
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5-November-1984
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*/
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#include "macrossTypes.h"
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#include "macrossGlobals.h"
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#include "buildStuff.h"
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#include "errorStuff.h"
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#include "garbage.h"
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#include "listing.h"
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#include "lookups.h"
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#include "operandStuff.h"
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#include "parserMisc.h"
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#include "semanticMisc.h"
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/*
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These routines all do basically the same thing. Various kinds of keywords
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and so forth are stored in hash tables. The hash buckets contain linked
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lists that are sorted alphabetically.
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*/
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conditionType
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lookupConditionCode(char *s, int hashValue)
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{
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conditionTableEntryType *result;
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result = (conditionTableEntryType *) prehashedStringLookup(s,
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conditionTable, hashValue);
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if (result != NULL)
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return(result->code);
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else
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return(NOT_FOUND_COND);
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}
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int
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lookupKeyword(char *s, int hashValue)
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{
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keywordTableEntryType *result;
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result = (keywordTableEntryType *) prehashedStringLookup(s,
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keywordTable, hashValue);
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if (result != NULL)
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return(result->token);
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else
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return(0);
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}
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macroTableEntryType *
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lookupMacroName(char *s, int hashValue)
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{
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return((macroTableEntryType *) prehashedStringLookup(s, macroTable,
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hashValue));
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}
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opcodeTableEntryType *
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lookupOpcode(char *s, int hashValue)
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{
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return((opcodeTableEntryType *) prehashedStringLookup(s,
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opcodeTable, hashValue));
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}
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/* lookupOrEnterSymbol -- if there is an entry in the symbol table for the
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given symbol, return that entry, otherwise create a new entry for it of
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the given kind and return *that* */
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symbolTableEntryType *
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lookupOrEnterSymbol(stringType *s, symbolUsageKindType kind)
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{
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symbolTableEntryType *result;
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if (result = (symbolTableEntryType *)hashStringLookup(s,symbolTable)){
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/* result->referenceCount++;*/
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return(result);
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} else
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return((symbolTableEntryType *)
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hashStringEnter(buildSymbolTableEntry(s, kind),
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symbolTable));
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}
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void
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pushSymbol(symbolTableEntryType *symbol)
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{
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symbolInContextType *newContext;
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newContext = typeAlloc(symbolInContextType);
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newContext->pushedContexts = symbol->context;
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symbol->context = newContext;
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}
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void
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popSymbol(symbolTableEntryType *symbol)
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{
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symbolInContextType *deadContext;
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deadContext = symbol->context;
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if (deadContext == NULL)
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botch("symbol pop underflow\n");
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else {
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symbol->context = deadContext->pushedContexts;
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if (freeFlag) {
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if (deadContext->value != NULL)
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freeValue(deadContext->value);
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free(deadContext);
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}
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}
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}
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macroTableEntryType *
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createMacro(stringType *macroName)
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{
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macroTableEntryType *result;
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symbolTableEntryType *testSymbol;
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testSymbol = lookupOrEnterSymbol(macroName, MACRO_SYMBOL);
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if (testSymbol->context->usage != MACRO_SYMBOL) {
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error(SYMBOL_ALREADY_THERE_ERROR, symbName(testSymbol));
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return(NULL);
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} else if (hashStringLookup(macroName, macroTable) != NULL) {
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error(SYMBOL_ALREADY_THERE_ERROR, symbName(testSymbol));
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return(NULL);
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} else {
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result = (macroTableEntryType *)
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hashStringEnter(buildMacroTableEntry(macroName),
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macroTable);
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result->body = NULL;
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return(result);
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}
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}
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/*
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Generic table lookup utility routines
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*/
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genericTableEntryType *
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prehashedStringLookup(char *s, genericTableEntryType **table, int hashValue)
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{
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genericTableEntryType *result;
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int test;
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result = table[hashValue];
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while (result != NULL) {
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if ((test = strcmplc(s, result->string)) == 0)
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break;
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else if (test > 0) {
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result = NULL;
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break;
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} else {
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result = result->next;
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}
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}
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return(result);
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}
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genericTableEntryType *
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hashStringLookup(char *s, genericTableEntryType **table)
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{
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return(prehashedStringLookup(s, table, hashString(s)));
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}
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genericTableEntryType *
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hashStringEnter(genericTableEntryType *entry, genericTableEntryType **table)
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{
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genericTableEntryType *result;
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genericTableEntryType *oldResult;
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int test;
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int hashValue;
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hashValue = hashString(entry->string);
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result = table[hashValue];
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if (result == NULL) {
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table[hashValue] = entry;
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entry->next = NULL;
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return(entry);
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}
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oldResult = NULL;
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while (result != NULL) {
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if ((test = strcmplc(entry->string, result->string)) == 0) {
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botch("symbol table entry %s already there\n",
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entry->string);
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} else if (test > 0) {
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entry->next = result;
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if (oldResult == NULL)
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table[hashValue] = entry;
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else
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oldResult->next = entry;
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return(entry);
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} else {
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oldResult = result;
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result = result->next;
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}
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}
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if (oldResult == NULL)
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table[hashValue] = entry;
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else
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oldResult->next = entry;
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entry->next = NULL;
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return(entry);
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}
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int
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hashString(char *s)
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{
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unsigned result;
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result = 0;
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while (*s != '\0')
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result = (result << 1) + toLowerCase(*s++);
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return(result & HASH_TABLE_MASK);
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}
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bool
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strcmplc(char *s1, char *s2) /* string compare in lower case */
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/* heavily optimized version */
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{
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char c1;
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int result;
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do {
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c1 = toLowerCase(*s1++);
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/* if result != 0, they differ */
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if (result = c1 - toLowerCase(*s2++)) {
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return(result); /* c1<c2==neg, c1>c2==pos */
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} else if (!c1) { /* if they're null, we're done */
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return(0);
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}
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} while (TRUE);
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}
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bool
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strcmplct(char *s1, char *s2) /* For tables: s2 is already lower case */
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/* heavily optimized version. */
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{
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char c1;
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int result;
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while (TRUE) {
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c1 = toLowerCase(*s1++);
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if (result = c1 - (*s2++)) { /* if result != 0, they differ */
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return(result); /* c1<c2==neg, c1>c2==pos */
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} else if (!c1) { /* if they're null, we're done */
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return(0);
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}
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}
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}
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void
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purgeSymbol(symbolTableEntryType *symbol)
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{
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symbolInContextType *context;
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if ((context = getWorkingContext(symbol)) != NULL)
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context->usage = DEAD_SYMBOL;
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}
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void
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reincarnateSymbol(symbolInContextType *context, symbolUsageKindType newUsage)
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{
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context->attributes = 0;
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dupValue(context->value, UndefinedValue);
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context->usage = newUsage;
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}
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/*
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Routines to handle assembly-time binding of symbols to contexts.
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*/
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void
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pushBinding(symbolTableEntryType *symbol, valueType *newBinding, symbolUsageKindType newUsage)
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{
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pushSymbol(symbol);
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if (newBinding == NULL)
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newBinding = newValue(FAIL, 0, EXPRESSION_OPND);
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symbol->context->value = newBinding;
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symbol->context->usage = newUsage;
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symbol->context->environmentNumber = currentEnvironment->
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environmentNumber;
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symbol->context->attributes = DEFINED_VARIABLE_ATT;
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}
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void
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popBinding(symbolTableEntryType *symbol)
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{
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popSymbol(symbol);
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}
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int /* returns number of bindings completed, negative this if failure */
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bindMacroArguments(argumentDefinitionListType *argumentList, operandListType *parameterList, stringType *macroName)
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{
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int numberBound;
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bool arrayTag;
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int arrayLength;
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valueType **arrayContents;
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int i;
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if (argumentList == NULL)
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arrayTag = FALSE;
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else
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arrayTag = ((argumentListHeadType *)argumentList)->arrayTag;
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numberBound = 1;
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while (argumentList!=NULL && (!arrayTag || argumentList->
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nextArgument!=NULL) && parameterList!=NULL) {
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pushBinding(argumentList->theArgument, newValue(OPERAND_VALUE,
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parameterList, EXPRESSION_OPND), ARGUMENT_SYMBOL);
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argumentList = argumentList->nextArgument;
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parameterList = parameterList->nextOperand;
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numberBound++;
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}
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if (!arrayTag) {
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if (parameterList != NULL) {
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error(TOO_MANY_ARGUMENTS_TO_MACRO_ERROR, macroName,
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numberBound-1);
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return(-numberBound);
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}
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while (argumentList != NULL) {
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pushBinding(argumentList->theArgument, newValue(FAIL,
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0, EXPRESSION_OPND), ARGUMENT_SYMBOL);
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argumentList = argumentList->nextArgument;
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numberBound++;
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}
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} else {
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if (parameterList == NULL) {
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while (argumentList->nextArgument != NULL) {
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pushBinding(argumentList->theArgument,
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newValue(FAIL, 0, EXPRESSION_OPND),
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ARGUMENT_SYMBOL);
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argumentList = argumentList->nextArgument;
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numberBound++;
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}
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}
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arrayLength = countParameters(parameterList);
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pushBinding(argumentList->theArgument, newValue(ARRAY_VALUE,
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allocArray(arrayLength, &arrayContents),
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EXPRESSION_OPND), ARGUMENT_SYMBOL);
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for (i=0; i<arrayLength; ++i) {
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arrayContents[i] = newValue(OPERAND_VALUE,
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parameterList, EXPRESSION_OPND);
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parameterList = parameterList->nextOperand;
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}
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numberBound++;
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}
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return(numberBound);
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}
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int /* returns number of bindings completed, negative this if failure */
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bindFunctionArguments(argumentDefinitionListType *argumentList, operandListType *parameterList, stringType *functionName)
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{
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valueType *argument;
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bool arrayTag;
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int arrayLength;
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valueType **arrayContents;
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int i;
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int numberBound;
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valueType *firstArgument;
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environmentType *saveEnvironment;
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if (argumentList == NULL)
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arrayTag = FALSE;
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else
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arrayTag = ((argumentListHeadType *)argumentList)->arrayTag;
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numberBound = 1;
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firstArgument = NULL;
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while (argumentList!=NULL && (!arrayTag || argumentList->
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nextArgument!=NULL) && parameterList!=NULL) {
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saveEnvironment = currentEnvironment;
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currentEnvironment = currentEnvironment->previousEnvironment;
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argument = evaluateOperand(parameterList);
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currentEnvironment = saveEnvironment;
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if (firstArgument == NULL)
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firstArgument = argument;
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if (isUsable(argument)) {
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pushBinding(argumentList->theArgument, argument,
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ARGUMENT_SYMBOL);
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argumentList = argumentList->nextArgument;
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parameterList = parameterList->nextOperand;
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expand((argumentList!=NULL && parameterList!=NULL) ?
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moreExpression(", ") : 0);
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numberBound++;
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} else {
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if (isUndefined(argument))
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resultOfLastFunctionCall =
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newValue(UNDEFINED_VALUE, 0,
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firstArgument->addressMode);
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return(-numberBound);
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}
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}
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if (!arrayTag) {
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if (parameterList != NULL) {
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error(TOO_MANY_ARGUMENTS_TO_FUNCTION_ERROR,
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functionName, numberBound - 1);
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return(-numberBound);
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}
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while (argumentList != NULL) {
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pushBinding(argumentList->theArgument, newValue(FAIL,
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0, EXPRESSION_OPND), ARGUMENT_SYMBOL);
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argumentList = argumentList->nextArgument;
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numberBound++;
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}
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} else {
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if (parameterList == NULL) {
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while (argumentList->nextArgument != NULL) {
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pushBinding(argumentList->theArgument,
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newValue(FAIL, 0, EXPRESSION_OPND),
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ARGUMENT_SYMBOL);
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argumentList = argumentList->nextArgument;
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numberBound++;
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}
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}
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arrayLength = countParameters(parameterList);
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pushBinding(argumentList->theArgument, newValue(ARRAY_VALUE,
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allocArray(arrayLength, &arrayContents),
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EXPRESSION_OPND), ARGUMENT_SYMBOL);
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numberBound++;
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for (i=0; i<arrayLength; ++i) {
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saveEnvironment = currentEnvironment;
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currentEnvironment = currentEnvironment->
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previousEnvironment;
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argument = evaluateOperand(parameterList);
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currentEnvironment = saveEnvironment;
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if (firstArgument == NULL)
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firstArgument = argument;
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if (isUsable(argument)) {
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arrayContents[i] = argument;
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parameterList = parameterList->nextOperand;
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} else {
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if (isUndefined(argument))
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resultOfLastFunctionCall =
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newValue(UNDEFINED_VALUE, 0,
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firstArgument->addressMode);
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return(-numberBound);
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}
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}
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}
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return(numberBound);
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}
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void
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unbindArguments(argumentDefinitionListType *argumentList, int numberToUnbind)
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{
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while (argumentList != NULL && numberToUnbind-- > 0) {
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popBinding(argumentList->theArgument);
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argumentList = argumentList->nextArgument;
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}
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if (numberToUnbind > 0)
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botch("binding count larger than number of bindings\n");
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}
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void
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unbindLocalVariables(identifierListType *identifierList)
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{
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identifierListType *deadEntry;
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while (identifierList != NULL) {
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popBinding(identifierList->theSymbol);
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deadEntry = identifierList;
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identifierList = identifierList->nextIdentifier;
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qfree(deadEntry);
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}
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}
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