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95 linhas
2.2 KiB
95 linhas
2.2 KiB
#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <assert.h>
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// Scope definition
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/** A scope is a set of identifiers */
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typedef struct scope {
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size_t scopeSize;
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char **identifiers;
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struct scope *parent;
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} scope_t ;
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scope_t *actualScope = 0;
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/** Add a new specifier to a scope */
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int addId(char *name) {
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ssize_t l = 0;
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ssize_t r = actualScope->scopeSize - 1;
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while ( l <= r ) {
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ssize_t c = (l+r)/2;
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int result = strcmp(name, actualScope->identifiers[c]);
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if (result > 0) {
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l = c + 1;
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} else if (result < 0) {
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r = c - 1;
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} else {
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/* Symbol found */
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fprintf(stderr, "\nConflicting types for '%s' \n", name);
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exit(0);
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return -1;
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}
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}
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/* Symbol does not exist */
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char* newSpecfier = strdup(name);
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actualScope->identifiers = realloc(actualScope->identifiers, sizeof(*actualScope->identifiers)*(actualScope->scopeSize + 1));
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memmove(actualScope->identifiers + l + 1, actualScope->identifiers + l, sizeof(*actualScope->identifiers)*(actualScope->scopeSize - l));
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actualScope->scopeSize++;
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actualScope->identifiers[l] = newSpecfier;
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return 1;
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}
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int pushScope(void) {
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/* A new scope is initialized */
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scope_t* newScope = malloc(sizeof(scope_t));
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newScope->scopeSize = 0;
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newScope->identifiers = 0;
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newScope->parent = actualScope;
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actualScope = newScope;
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/* Everything was done well*/
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return 1;
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}
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int popScope(void) {
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assert(actualScope);
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scope_t *parent = actualScope->parent;
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free(actualScope->identifiers);
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free(actualScope);
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actualScope = parent;
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return 1;
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}
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int isTypedefed(char *s) {
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for (scope_t *scope = actualScope ; scope ; scope = scope->parent) {
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ssize_t l = 0;
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ssize_t r = scope->scopeSize - 1;
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while ( l <= r ) {
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ssize_t c = (l+r)/2;
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int result = strcmp(s, scope->identifiers[c]);
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if (result > 0) {
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l = c + 1;
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} else if (result < 0) {
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r = c - 1;
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} else {
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/* Symbol found */
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return 1;
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}
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}
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}
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/* Symbol not found */
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return 0;
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}
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