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/*
* Procedure parser.
* Copyright (c) 2023-2024, Quinn Stephens and the OSMORA team.
* Provided under the BSD 3-Clause license.
*/
#include <stdbool.h>
#include "debug.h"
#include "parser/proc.h"
#include "parser/type.h"
#include "parser.h"
#define HASHMAP_ROWS 8
static bool
parse_params(struct parser *ctx, struct procedure *proc)
{
struct parameter *param;
struct variable *var;
struct type *typ;
int n_ptrs;
debug("Parsing procedure parameters...\n");
while (ctx->tok.kind != TK_RPAREN) {
if (ctx->tok.kind != TK_IDENTIFIER) {
tok_error(&ctx->tok, "expected parameter type name or \")\"\n");
return false;
}
if (!parse_type_ref(ctx, &typ, &n_ptrs)) {
return false;
}
if (ctx->tok.kind != TK_IDENTIFIER) {
tok_error(&ctx->tok, "expected parameter name\n");
return false;
}
param = malloc(sizeof(struct parameter));
var = ¶m->var;
var->hashmap_entry.hash = ctx->tok.hash;
var->name = ctx->tok.pos;
var->name_len = ctx->tok.len;
var->typ = typ;
var->n_ptrs = n_ptrs;
hashmap_add(&proc->vars, &var->hashmap_entry);
list_append(&proc->params, ¶m->list_entry);
if (next_token(ctx)->kind == TK_COMMA && next_token(ctx)->kind == TK_RPAREN) {
tok_warn(&ctx->tok, "extra \",\" at end of parameter list\n");
}
}
next_token(ctx);
return true;
}
void
parse_proc(struct parser *ctx)
{
struct procedure *proc;
debug("Parsing procedure declaration...\n");
/* Procedure name */
if (next_token(ctx)->kind != TK_IDENTIFIER) {
tok_error(&ctx->tok, "expected identifier after \"proc\"\n");
return;
}
/* Ensure procedure does not already exist */
proc = (struct procedure*)hashmap_find(ctx->procs, ctx->tok.hash);
if (proc != NULL) {
tok_error(&ctx->tok, "procedure \"%.*s\" already declared\n", (int)ctx->tok.len, ctx->tok.pos);
return;
}
/* Create procedure */
proc = malloc(sizeof(struct procedure));
proc->hashmap_entry.hash = ctx->tok.hash;
proc->name = ctx->tok.pos;
proc->name_len = ctx->tok.len;
if (next_token(ctx)->kind != TK_LPAREN) {
tok_error(&ctx->tok, "expected \"(\" after procedure name\n");
free(proc);
return;
}
/* Set up variables hashmap */
proc->vars.rows = malloc(HASHMAP_ROWS * sizeof(struct list));
proc->vars.n_rows = HASHMAP_ROWS;
hashmap_init(&proc->vars);
/* Set up parameter list */
list_init(&proc->params);
/* Parse parameters */
if (next_token(ctx)->kind != TK_RPAREN) {
if (!parse_params(ctx, proc)) {
hashmap_free_entries(&proc->vars);
free(proc->vars.rows);
free(proc);
return;
}
} else {
next_token(ctx);
}
/* Parse return type if specified */
if (ctx->tok.kind == TK_ARROW) {
next_token(ctx);
if (!parse_type_ref(ctx, &proc->ret_typ, &proc->ret_n_ptrs)) {
hashmap_free_entries(&proc->vars);
free(proc->vars.rows);
free(proc);
return;
}
}
/* Add procedure to parser's registry */
hashmap_add(ctx->procs, &proc->hashmap_entry);
/* We are finished now if this is just a declaration */
if (ctx->tok.kind == TK_SEMICOLON) {
next_token(ctx);
return;
}
if (ctx->tok.kind != TK_LBRACE) {
tok_error(&ctx->tok, "Expected \";\" or \"{\"\n");
return;
}
/* TODO: Parse body/code */
if (next_token(ctx)->kind != TK_RBRACE) {
tok_error(&ctx->tok, "Expected \"}\" after procedure body\n");
return;
}
next_token(ctx);
}
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