437 lines
15 KiB
C
437 lines
15 KiB
C
/* spl_parser.c — Top-level parser: function declarations, type declarations, etc. */
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#include "spl_comp.h"
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#include "spl_lex_util.h"
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#include <string.h>
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spl_tok_t *peek(spl_comp_t *ctx) { return &vec_at(ctx->toks, ctx->tok_idx); }
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spl_tok_t *advance(spl_comp_t *ctx) {
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spl_tok_t *t = &vec_at(ctx->toks, ctx->tok_idx);
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if (t->type != TOK_EOF)
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ctx->tok_idx++;
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return t;
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}
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/* ============================================================
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* Parse function definition
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* fn name(params) ret-type { body }
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* or fn name(params) ret-type; (forward decl, not used for stage1)
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* ============================================================ */
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/* Shared helper: register a function, declare params, parse body, end function.
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* Used by both top-level fn decl and methods inside type bodies. */
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/* Shared helper: parse function/method parameter list: (name: type, name: type, ...)
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* Returns number of params parsed. Stores names in pnames and types in ptypes
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* (both must be MAX_PARAMS-sized arrays). */
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enum { MAX_PARAMS = 64 };
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static int parse_params_decl(spl_comp_t *ctx, char pnames[][256], spl_type_info_t *ptypes[]) {
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int nparams = 0;
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skip_nl(ctx);
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if (peek(ctx)->type != TOK_R_PAREN) {
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while (1) {
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spl_tok_t *pname = advance(ctx);
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spl_tok_copy_name(pname, pnames[nparams], 256);
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skip_nl(ctx);
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if (peek(ctx)->type == TOK_COLON) {
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advance(ctx); /* : */
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skip_nl(ctx);
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ptypes[nparams] = spl_parse_type(ctx);
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} else {
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ptypes[nparams] = spl_type_basic(SPL_I32);
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}
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nparams++;
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skip_nl(ctx);
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if (peek(ctx)->type == TOK_COMMA) {
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advance(ctx);
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skip_nl(ctx);
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continue;
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}
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if (peek(ctx)->type == TOK_ELLIPSIS) {
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advance(ctx);
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skip_nl(ctx);
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}
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break;
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}
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}
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expect(ctx, TOK_R_PAREN);
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return nparams;
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}
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static int parse_fn_body(spl_comp_t *ctx, const char *fn_name, spl_type_info_t *ret_type,
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int nparams, char pnames[][256], spl_type_info_t *ptypes[], int is_pub) {
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int fi = spl_declare_func(ctx, fn_name, ret_type, nparams, 0, is_pub);
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ctx->current_func_idx = fi;
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ctx->current_ret_type = ret_type;
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ctx->current_local_bytes = 0;
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ctx->peak_local_bytes = 0;
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spl_push_scope(ctx);
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for (int i = 0; i < nparams; i++) {
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spl_declare_var(ctx, pnames[i], ptypes[i], 0);
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}
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skip_nl(ctx);
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if (peek(ctx)->type == TOK_L_BRACE) {
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advance(ctx); /* { */
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skip_nl(ctx);
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spl_val_t alloc_addr = vec_size(ctx->prog.insns);
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spl_emit(ctx, SPL_ALLOC, SPL_VOID, 0);
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while (peek(ctx)->type != TOK_R_BRACE && peek(ctx)->type != TOK_EOF) {
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spl_parse_stmt(ctx);
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skip_nl(ctx);
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}
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spl_patch(ctx, alloc_addr, ctx->peak_local_bytes / (int)sizeof(spl_val_t) - nparams);
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expect(ctx, TOK_R_BRACE);
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}
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spl_emit_defer_epilogue(ctx, ctx->scope_depth);
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spl_pop_scope(ctx);
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spl_emit(ctx, SPL_RET, SPL_VOID, 0);
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spl_prog_end_func(&ctx->prog, fi);
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ctx->current_func_idx = -1;
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ctx->current_ret_type = NULL;
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return fi;
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}
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static void parse_fn_decl(spl_comp_t *ctx, int is_extern, int is_pub) {
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advance(ctx); /* fn */
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skip_nl(ctx);
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spl_tok_t *fname_tok = advance(ctx);
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char fn_name[256];
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spl_tok_copy_name(fname_tok, fn_name, sizeof(fn_name));
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skip_nl(ctx);
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expect(ctx, TOK_L_PAREN);
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/* Parse parameters — collect names and types */
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char pnames[MAX_PARAMS][256];
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spl_type_info_t *ptypes[MAX_PARAMS];
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int nparams = parse_params_decl(ctx, pnames, ptypes);
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skip_nl(ctx);
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/* Return type (default: void) */
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spl_type_info_t *ret_type = spl_type_basic(SPL_VOID);
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if (peek(ctx)->type != TOK_SEMICOLON && peek(ctx)->type != TOK_L_BRACE) {
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ret_type = spl_parse_type(ctx);
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if (!ret_type)
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ret_type = spl_type_basic(SPL_VOID);
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skip_nl(ctx);
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}
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/* Extern function: register as native, no body */
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if (is_extern) {
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spl_declare_func(ctx, fn_name, ret_type, nparams, 1, is_pub);
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spl_ensure_native(ctx, fn_name);
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if (peek(ctx)->type == TOK_SEMICOLON)
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advance(ctx);
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return;
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}
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/* Check for forward declaration (just semicolon, skip) */
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if (peek(ctx)->type == TOK_SEMICOLON) {
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advance(ctx);
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return;
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}
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skip_nl(ctx);
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/* Use shared helper for function body parsing */
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parse_fn_body(ctx, fn_name, ret_type, nparams, pnames, ptypes, is_pub);
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}
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/* ============================================================
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* Shared helper: parse a method declaration inside a type body.
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* Used by both struct_body and enum_body parsers.
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* fn name(params) ret-type { body }
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* ============================================================ */
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static void parse_method_decl(spl_comp_t *ctx, spl_type_info_t *container) {
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advance(ctx); /* fn */
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skip_nl(ctx);
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spl_tok_t *mname_tok = advance(ctx);
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char mname[256];
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spl_tok_copy_name(mname_tok, mname, sizeof(mname));
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/* Build qualified name: TypeName.method_name */
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char qualified[512];
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snprintf(qualified, sizeof(qualified), "%s.%s", container->name ? container->name : "anon",
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mname);
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skip_nl(ctx);
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expect(ctx, TOK_L_PAREN);
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/* Parse parameters using shared helper */
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char pnames[MAX_PARAMS][256];
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spl_type_info_t *ptypes[MAX_PARAMS];
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int nparams = parse_params_decl(ctx, pnames, ptypes);
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skip_nl(ctx);
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/* Return type (default: void) */
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spl_type_info_t *ret_type = spl_type_basic(SPL_VOID);
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if (peek(ctx)->type != TOK_SEMICOLON && peek(ctx)->type != TOK_L_BRACE) {
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ret_type = spl_parse_type(ctx);
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if (!ret_type)
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ret_type = spl_type_basic(SPL_VOID);
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skip_nl(ctx);
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}
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/* Set current_type_name for short-name resolution inside method body */
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const char *saved_type_name = ctx->current_type_name;
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ctx->current_type_name = container->name;
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int fi = parse_fn_body(ctx, qualified, ret_type, nparams, pnames, ptypes, 0);
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ctx->current_type_name = saved_type_name;
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{
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spl_func_info_t *f = &vec_at(ctx->funcs, fi);
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f->param_types = calloc(nparams, sizeof(spl_type_info_t *));
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f->param_names = calloc(nparams, sizeof(char *));
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for (int i = 0; i < nparams; i++) {
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f->param_types[i] = ptypes[i];
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f->param_names[i] = strdup(pnames[i]);
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}
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}
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spl_type_add_method(container, mname, fi);
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}
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/* ============================================================
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* Parse type container body (shared for struct, union, enum)
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*
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* For struct/union: fields are added for identifiers
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* For enum: variants are added for identifiers
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*
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* Body supports:
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* var name: type; — field declarations (struct/union only)
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* name: type, — field/variant declarations
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* name: Type, — enum variant with data
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* name, — simple enum variant
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* type Name = ...; — nested type declarations
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* fn name(...) type { } — methods
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* ============================================================ */
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static void parse_type_body(spl_comp_t *ctx, spl_type_info_t *container, int is_enum) {
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if (peek(ctx)->type != TOK_L_BRACE)
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return;
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advance(ctx); /* { */
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/* === Pass 1: Parse all nested type declarations first ===
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* This allows fields/variants to reference types defined later. */
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{
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usize saved = ctx->tok_idx;
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int depth = 1;
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while (depth > 0 && ctx->tok_idx < vec_size(ctx->toks)) {
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spl_tok_type_t tt = peek(ctx)->type;
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if (tt == TOK_L_BRACE) {
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depth++;
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advance(ctx);
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} else if (tt == TOK_R_BRACE) {
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depth--;
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if (depth == 0)
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break;
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advance(ctx);
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} else if (tt == KW_TYPE && depth == 1) {
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parse_type_decl(ctx);
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} else {
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advance(ctx);
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}
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}
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ctx->tok_idx = saved;
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}
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/* === Pass 2: Parse fields/variants and methods === */
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{
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int depth = 1;
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while (depth > 0 && ctx->tok_idx < vec_size(ctx->toks)) {
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skip_nl(ctx);
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spl_tok_type_t tt = peek(ctx)->type;
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if (tt == TOK_L_BRACE) {
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depth++;
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advance(ctx);
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} else if (tt == TOK_R_BRACE) {
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depth--;
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if (depth == 0) {
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advance(ctx);
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break;
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}
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advance(ctx);
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} else if (tt == KW_TYPE && depth == 1) {
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/* Nested type — already parsed in pass 1, skip */
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parse_type_decl(ctx);
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} else if (tt == KW_VAR && depth == 1 && !is_enum) {
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/* var name: type; (struct/union only) */
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advance(ctx); /* var */
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skip_nl(ctx);
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spl_tok_t *ftok = advance(ctx);
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skip_nl(ctx);
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if (peek(ctx)->type == TOK_COLON) {
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advance(ctx); /* : */
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skip_nl(ctx);
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spl_type_info_t *ftype = spl_parse_type(ctx);
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char fname[256];
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spl_tok_copy_name(ftok, fname, sizeof(fname));
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spl_type_add_field(container, fname, ftype);
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}
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skip_nl(ctx);
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if (peek(ctx)->type == TOK_SEMICOLON || peek(ctx)->type == TOK_COMMA)
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advance(ctx);
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} else if (tt == TOK_IDENT && depth == 1) {
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if (is_enum) {
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/* Variant: Name or Name: Type */
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spl_tok_t *vtok = advance(ctx);
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skip_nl(ctx);
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if (peek(ctx)->type == TOK_COLON) {
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advance(ctx); /* : */
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skip_nl(ctx);
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spl_type_info_t *dtype = spl_parse_type(ctx);
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char vname[256];
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spl_tok_copy_name(vtok, vname, sizeof(vname));
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spl_type_add_variant(container, vname, dtype);
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} else {
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char vname[256];
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spl_tok_copy_name(vtok, vname, sizeof(vname));
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spl_type_add_variant(container, vname, NULL);
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}
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} else {
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/* Old-style field: name: type, */
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spl_tok_t *ftok = advance(ctx);
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skip_nl(ctx);
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if (peek(ctx)->type == TOK_COLON) {
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advance(ctx); /* : */
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skip_nl(ctx);
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spl_type_info_t *ftype = spl_parse_type(ctx);
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char fname[256];
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spl_tok_copy_name(ftok, fname, sizeof(fname));
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spl_type_add_field(container, fname, ftype);
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}
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}
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skip_nl(ctx);
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if (peek(ctx)->type == TOK_SEMICOLON || peek(ctx)->type == TOK_COMMA)
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advance(ctx);
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} else if (tt == KW_FN && depth == 1) {
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parse_method_decl(ctx, container);
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} else {
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advance(ctx);
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}
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}
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}
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spl_type_compute_layout(container);
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}
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/* ============================================================
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* Parse type declaration
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* type Name = struct { ... };
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* type Name = union { ... };
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* type Name = enum { ... };
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* type Name = ExistingType;
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* ============================================================ */
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void parse_type_decl(spl_comp_t *ctx) {
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advance(ctx); /* type */
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spl_tok_t *name_tok = advance(ctx);
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char tname[256];
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spl_tok_copy_name(name_tok, tname, sizeof(tname));
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skip_nl(ctx);
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expect(ctx, TOK_ASSIGN);
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skip_nl(ctx);
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if (peek(ctx)->type == KW_STRUCT) {
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advance(ctx);
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spl_type_info_t *st = spl_type_struct(tname);
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/* Register type early to allow self-referential fields */
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map_put(ctx->type_defs, strdup(tname), st);
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skip_nl(ctx);
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parse_type_body(ctx, st, 0);
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} else if (peek(ctx)->type == KW_UNION) {
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advance(ctx);
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spl_type_info_t *ut = spl_type_union(tname);
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map_put(ctx->type_defs, strdup(tname), ut);
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skip_nl(ctx);
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parse_type_body(ctx, ut, 0);
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} else if (peek(ctx)->type == KW_ENUM) {
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advance(ctx);
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spl_type_info_t *et = spl_type_enum(tname);
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/* Register type early to allow self-referential variants */
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map_put(ctx->type_defs, strdup(tname), et);
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skip_nl(ctx);
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parse_type_body(ctx, et, 1);
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} else if (peek(ctx)->type == TOK_IDENT ||
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(peek(ctx)->type >= KW_AS && peek(ctx)->type <= KW_ANY)) {
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spl_type_info_t *base = spl_parse_type(ctx);
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if (base) {
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spl_type_info_t *alias = spl_type_clone(base);
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alias->name = strdup(tname);
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alias->kind = TYPE_NAME;
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map_put(ctx->type_defs, strdup(tname), alias);
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}
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}
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skip_nl(ctx);
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if (peek(ctx)->type == TOK_SEMICOLON)
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advance(ctx);
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}
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/* ============================================================
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* Parse top-level program
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* ============================================================ */
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void spl_parse_prog(spl_comp_t *ctx) {
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while (peek(ctx)->type != TOK_EOF) {
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skip_nl(ctx);
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if (peek(ctx)->type == TOK_EOF)
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break;
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switch (peek(ctx)->type) {
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case KW_FN:
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parse_fn_decl(ctx, 0, 0);
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break;
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case KW_TYPE:
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parse_type_decl(ctx);
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break;
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case KW_PUB: {
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advance(ctx); /* skip pub */
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skip_nl(ctx);
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if (peek(ctx)->type == KW_FN)
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parse_fn_decl(ctx, 0, 1);
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else if (peek(ctx)->type == KW_TYPE)
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parse_type_decl(ctx);
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break;
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}
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case TOK_SHARP:
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/* #[extern("vm")] fn ... */
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advance(ctx); /* # */
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if (peek(ctx)->type == TOK_L_BRACKET) {
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advance(ctx); /* [ */
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while (peek(ctx)->type != TOK_R_BRACKET && peek(ctx)->type != TOK_EOF)
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advance(ctx);
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if (peek(ctx)->type == TOK_R_BRACKET)
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advance(ctx);
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}
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skip_nl(ctx);
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if (peek(ctx)->type == KW_FN)
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parse_fn_decl(ctx, 1, 0);
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break;
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default: {
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int prev = ctx->tok_idx;
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/* Try to parse as a statement */
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spl_parse_stmt(ctx);
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/* Safety: prevent infinite loop on unrecognized tokens */
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if (ctx->tok_idx == prev)
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advance(ctx);
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break;
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}
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}
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}
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}
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