268 lines
7.0 KiB
C
268 lines
7.0 KiB
C
#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include "compiler-scopes.h"
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typedef enum { local, staticseg, arg, fieldseg } MEMSEGMENT;
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char* memsegnames[] = { "local", "static", "argument", "this" };
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// Error messages
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void doubledeclaration(const char* name, DEBUGINFO* d1, DEBUGINFO* d2);
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void ensurenoduplicate(SCOPE* s, char* name);
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// Getters
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VAR* getvarinvars(VAR* vars, const char* name);
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CLASS* getclass(SCOPE* s, const char* name);
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SUBROUTDEC* getsubroutdecfromlist(SUBROUTDEC* start, char* name);
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SUBROUTDEC* getmethod(SCOPE* s, VAR* parent, SUBROUTCALL* call);
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SUBROUTDEC* getfunction(SCOPE* s, SUBROUTCALL* call);
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SUBROUTDEC* getsubroutdecwithparent(SCOPE* s, SUBROUTCALL* call);
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SUBROUTDEC* getsubroutdecwithoutparent(SCOPE* s, SUBROUTCALL* call);
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SUBROUTDEC* getsubroutdec(SCOPE* s, const char* name);
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// Scope adding
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VAR* mkvar(char* type, char* name, bool primitive, DEBUGINFO* debug, MEMSEGMENT seg);
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void addvar(SCOPE* s, VAR** dest, VAR* v);
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void addlocalvar(SCOPE* s, VARDEC* v);
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void addclassvardec(SCOPE* s, CLASSVARDEC* v);
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void addparameter(SCOPE* s, PARAMETER* p);
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// Error messages
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void doubledeclaration(const char* name, DEBUGINFO* d1, DEBUGINFO* d2) {
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eprintf("Double declaration of '%s' at '%s', line %i; previously defined at '%s', line %i\n",
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name, d1->file, d1->definedat, d2->file, d2->definedat);
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exit(1);
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}
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void notdeclared(const char* name, DEBUGINFO* debug) {
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eprintf("'%s' not declared; file '%s', line %i\n", name, debug->file, debug->definedat);
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exit(1);
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}
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void invalidparent(SUBROUTCALL* call) {
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eprintf("Invalid subroutine parent '%s'; file '%s', line %i\n", call->parentname, call->debug->file, call->debug->definedat);
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exit(1);
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}
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void ensurenoduplicate(SCOPE* s, char* name) {
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VAR* v = getvar(s, name);
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if(v != NULL)
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doubledeclaration(name, s->currdebug, v->debug);
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CLASS* c = getclass(s, name);
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if(c != NULL)
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doubledeclaration(name, s->currdebug, c->debug);
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SUBROUTDEC* sr = getsubroutdec(s, name);
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if(sr != NULL)
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doubledeclaration(name, s->currdebug, sr->debug);
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}
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// Scope handling
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SCOPE* mkscope(SCOPE* prev) {
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SCOPE* s = (SCOPE*)malloc(sizeof(SCOPE));
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s->previous = prev;
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s->localvars = NULL;
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s->fields = NULL;
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s->staticvars = NULL;
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s->parameters = NULL;
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s->classes = NULL;
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s->subroutines = NULL;
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return s;
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}
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// Getters
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VAR* getvarinvars(VAR* vars, const char* name) {
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while(vars != NULL) {
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if(!strcmp(vars->name, name))
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return vars;
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vars = vars->next;
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}
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return NULL;
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}
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VAR* getvar(SCOPE* s, const char* name) {
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VAR* var = getvarinvars(s->localvars, name);
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if(var != NULL)
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return var;
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var = getvarinvars(s->parameters, name);
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if(var != NULL)
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return var;
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var = getvarinvars(s->fields, name);
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if(var != NULL)
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return var;
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var = getvarinvars(s->staticvars, name);
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if(var != NULL)
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return var;
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if(s->previous != NULL)
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return getvar(s->previous, name);
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return NULL;
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}
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CLASS* getclass(SCOPE* s, const char* name) {
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CLASS* curr = s->classes;
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while(curr != NULL) {
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if(!strcmp(curr->name, name))
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return curr;
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curr = curr->next;
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}
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if(s->previous != NULL)
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return getclass(s->previous, name);
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return NULL;
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}
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SUBROUTDEC* getsubroutdecfromlist(SUBROUTDEC* start, char* name) {
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while(start != NULL) {
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if(!strcmp(start->name, name))
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return start;
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start = start->next;
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}
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return NULL;
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}
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SUBROUTDEC* getmethod(SCOPE* s, VAR* parent, SUBROUTCALL* call) {
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CLASS* c = getclass(s, parent->type);
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SUBROUTDEC* d = getsubroutdecfromlist(c->subroutdecs, call->name);
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if(d == NULL)
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notdeclared(call->name, call->debug);
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if(d->subroutclass != method) {
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eprintf("Calling a function/constructor as if it were a method; file '%s', line %i\n", call->debug->file, call->debug->definedat);
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exit(1);
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}
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return d;
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}
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SUBROUTDEC* getfunction(SCOPE* s, SUBROUTCALL* call) {
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CLASS* c = getclass(s, call->parentname);
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if(c == NULL)
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notdeclared(call->parentname, call->debug);
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SUBROUTDEC* d = getsubroutdecfromlist(c->subroutdecs, call->name);
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if(d == NULL)
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notdeclared(call->name, call->debug);
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if(d->subroutclass == method) {
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eprintf("Calling a method as if it were a function; file '%s', line %i\n", call->debug->file, call->debug->definedat);
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exit(1);
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}
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return d;
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}
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SUBROUTDEC* getsubroutdecwithparent(SCOPE* s, SUBROUTCALL* call) {
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VAR* parent = getvar(s, call->parentname);
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if(parent != NULL)
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return getmethod(s, parent, call);
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else
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return getfunction(s, call);
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}
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SUBROUTDEC* getsubroutdecwithoutparent(SCOPE* s, SUBROUTCALL* call) {
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SUBROUTDEC* d = getsubroutdecfromlist(s->currclass->subroutdecs, call->name);
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if(d == NULL)
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notdeclared(call->name, call->debug);
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return d;
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}
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SUBROUTDEC* getsubroutdecfromcall(SCOPE* s, SUBROUTCALL* call) {
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if(call->parentname != NULL)
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return getsubroutdecwithparent(s, call);
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else
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return getsubroutdecwithoutparent(s, call);
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}
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SUBROUTDEC* getsubroutdec(SCOPE* s, const char* name) {
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SUBROUTDEC* curr = s->subroutines;
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while(curr != NULL) {
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if(!strcmp(curr->name, name))
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return curr;
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curr = curr->next;
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}
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if(s->previous != NULL)
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return getsubroutdec(s->previous, name);
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return NULL;
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}
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// Scope adding
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VAR* mkvar(char* type, char* name, bool primitive, DEBUGINFO* debug, MEMSEGMENT seg) {
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VAR* v = (VAR*)malloc(sizeof(VAR));
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v->name = name;
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v->type = type;
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v->debug = debug;
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v->memsegment = memsegnames[seg];
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v->primitive = primitive;
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return v;
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}
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void addvar(SCOPE* s, VAR** dest, VAR* v) {
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ensurenoduplicate(s, v->name);
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if(!v->primitive) {
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CLASS* type = getclass(s, v->type);
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if(type == NULL)
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notdeclared(v->type, v->debug);
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}
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if(*dest == NULL)
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v->index = 0;
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else
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v->index = 1+(*dest)->index;
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v->next = *dest;
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*dest = v;
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}
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void addlocalvar(SCOPE* s, VARDEC* v) {
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STRINGLIST* currname = v->names;
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while(currname != NULL) {
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addvar(s, &(s->localvars), mkvar(v->type, currname->content, v->primitive, v->debug, local));
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currname = currname->next;
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}
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}
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void addstaticvar(SCOPE* s, CLASSVARDEC* v) {
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STRINGLIST* currname = v->base->names;
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while(currname != NULL) {
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addvar(s, &(s->staticvars), mkvar(v->base->type, currname->content, v->base->primitive, v->base->debug, staticseg));
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currname = currname->next;
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}
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}
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void addfield(SCOPE* s, CLASSVARDEC* v) {
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STRINGLIST* currname = v->base->names;
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while(currname != NULL) {
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addvar(s, &(s->fields), mkvar(v->base->type, currname->content, v->base->primitive, v->base->debug, fieldseg));
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currname = currname->next;
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}
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}
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void addclassvardec(SCOPE* s, CLASSVARDEC* v) {
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if(v->type == staticseg)
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addstaticvar(s, v);
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else
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addfield(s, v);
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}
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void addparameter(SCOPE* s, PARAMETER* p) {
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addvar(s, &(s->parameters), mkvar(p->type, p->name, p->primitive, p->debug, arg));
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}
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// Group adding
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void addclassvardecs(SCOPE* s, CLASSVARDEC* classvardecs) {
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while(classvardecs != NULL) {
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addclassvardec(s, classvardecs);
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classvardecs = classvardecs->next;
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}
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}
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void addlocalvars(SCOPE* s, VARDEC* localvars) {
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while(localvars != NULL) {
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addlocalvar(s, localvars);
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localvars = localvars->next;
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}
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}
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void addparameters(SCOPE* s, PARAMETER* params) {
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while(params != NULL) {
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addparameter(s, params);
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params = params->next;
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}
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}
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