528 lines
18 KiB
C
528 lines
18 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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/* ============================================================
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* Parse function definition
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* ============================================================ */
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enum { MAX_PARAMS = 64 };
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static int parse_params_decl(spl_comp_t *ctx, char pnames[][256], int 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_type_parse(&ctx->tctx, ctx);
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} else {
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ptypes[nparams] = spl_type_basic(&ctx->tctx, 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, int ret_type_idx, int nparams,
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char pnames[][256], int ptypes[], int is_pub) {
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int fi = spl_declare_func(ctx, fn_name, ret_type_idx, nparams, 0, is_pub);
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{
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spl_func_info_t *f = &vec_at(ctx->funcs, fi);
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f->param_type_indices = calloc(nparams, sizeof(int));
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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_type_indices[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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ctx->current_func_idx = fi;
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ctx->current_ret_type_idx = ret_type_idx;
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fa_init(&ctx->emit.frame);
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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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emit_alloc(&ctx->emit, 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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int total_phys_slots = 0;
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for (int i = 0; i < nparams; i++) {
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usize psz = spl_type_size(&ctx->tctx, ptypes[i]);
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total_phys_slots += (int)((psz + sizeof(spl_val_t) - 1) / sizeof(spl_val_t));
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}
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if (spl_type_needs_multi_slot(&ctx->tctx, ret_type_idx)) {
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usize min_bytes = spl_type_slot_count(&ctx->tctx, ret_type_idx) * sizeof(spl_val_t);
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if ((usize)ctx->emit.frame.peak_bytes < min_bytes)
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ctx->emit.frame.peak_bytes = (int)min_bytes;
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}
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emit_patch(&ctx->emit, alloc_addr,
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ctx->emit.frame.peak_bytes / (int)sizeof(spl_val_t) - total_phys_slots);
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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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emit_return(&ctx->emit, &ctx->tctx, ctx->current_ret_type_idx);
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{
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spl_func_info_t *f = &vec_at(ctx->funcs, fi);
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spl_prog_end_func(&ctx->prog, f->func_idx);
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}
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ctx->current_func_idx = -1;
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ctx->current_ret_type_idx = -1;
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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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char pnames[MAX_PARAMS][256];
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int 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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int ret_type_idx = spl_type_basic(&ctx->tctx, SPL_VOID);
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if (peek(ctx)->type != TOK_SEMICOLON && peek(ctx)->type != TOK_L_BRACE) {
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ret_type_idx = spl_type_parse(&ctx->tctx, ctx);
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if (ret_type_idx < 0)
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ret_type_idx = spl_type_basic(&ctx->tctx, SPL_VOID);
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skip_nl(ctx);
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}
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int fi;
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if (is_extern) {
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fi = spl_declare_func(ctx, fn_name, ret_type_idx, nparams, 1, is_pub);
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spl_ensure_native(ctx, fn_name);
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if (ctx->tctx.current_type_idx == 0)
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spl_type_add_method(&ctx->tctx, 0, fn_name, fi);
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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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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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fi = parse_fn_body(ctx, fn_name, ret_type_idx, nparams, pnames, ptypes, is_pub);
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if (ctx->tctx.current_type_idx == 0)
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spl_type_add_method(&ctx->tctx, 0, fn_name, fi);
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}
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/* ============================================================
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* Parse method declaration inside a type body
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* ============================================================ */
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static void parse_method_decl(spl_comp_t *ctx, int container_type_idx) {
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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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const char *cname = spl_type_name(&ctx->tctx, container_type_idx);
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char qualified[512];
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snprintf(qualified, sizeof(qualified), "%s.%s", cname ? cname : "anon", mname);
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skip_nl(ctx);
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expect(ctx, TOK_L_PAREN);
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char pnames[MAX_PARAMS][256];
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int 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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int ret_type_idx = spl_type_basic(&ctx->tctx, SPL_VOID);
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if (peek(ctx)->type != TOK_SEMICOLON && peek(ctx)->type != TOK_L_BRACE) {
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ret_type_idx = spl_type_parse(&ctx->tctx, ctx);
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if (ret_type_idx < 0)
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ret_type_idx = spl_type_basic(&ctx->tctx, SPL_VOID);
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skip_nl(ctx);
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}
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int fi = parse_fn_body(ctx, qualified, ret_type_idx, nparams, pnames, ptypes, 0);
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spl_type_add_method(&ctx->tctx, container_type_idx, 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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static void skip_type_decl(spl_comp_t *ctx) {
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advance(ctx); /* type */
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advance(ctx); /* name */
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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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spl_tok_type_t tt = peek(ctx)->type;
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if (tt == KW_STRUCT || tt == KW_UNION || tt == KW_ENUM) {
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advance(ctx);
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skip_nl(ctx);
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}
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if (peek(ctx)->type == TOK_L_BRACE) {
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int bd = 1;
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advance(ctx);
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while (bd > 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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bd++;
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else if (tt == TOK_R_BRACE)
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bd--;
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else if (tt == TOK_EOF)
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break;
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advance(ctx);
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}
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} else {
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while (peek(ctx)->type != TOK_SEMICOLON && peek(ctx)->type != TOK_EOF)
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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 == TOK_SEMICOLON)
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advance(ctx);
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}
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static void parse_type_body(spl_comp_t *ctx, int container_type_idx, 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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int saved_current = ctx->tctx.current_type_idx;
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ctx->tctx.current_type_idx = container_type_idx;
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/* === Pass 1: Parse all nested type declarations first === */
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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 if (tt == TOK_EOF) {
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break;
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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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/* === Pre-register method names for forward references === */
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{
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const char *cname = spl_type_name(&ctx->tctx, container_type_idx);
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if (cname) {
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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_FN && depth == 1) {
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advance(ctx); /* fn */
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skip_nl(ctx);
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spl_tok_t *name_tok = advance(ctx);
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char mname[256];
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spl_tok_copy_name(name_tok, mname, sizeof(mname));
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/* Count parameters for forward reference */
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int pcount = 0;
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if (peek(ctx)->type == TOK_L_PAREN) {
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advance(ctx); /* ( */
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skip_nl(ctx);
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if (peek(ctx)->type != TOK_R_PAREN) {
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pcount = 1;
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for (;;) {
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advance(ctx); /* skip param name or type token */
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skip_nl(ctx);
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if (peek(ctx)->type == TOK_R_PAREN)
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break;
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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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pcount++;
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}
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}
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}
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advance(ctx); /* ) */
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}
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char qualified[512];
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snprintf(qualified, sizeof(qualified), "%s.%s", cname, mname);
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int fi = spl_declare_func(ctx, qualified, -1, pcount, 0, 0);
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spl_type_add_method(&ctx->tctx, container_type_idx, mname, fi);
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} else if (tt == TOK_EOF) {
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break;
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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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}
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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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skip_type_decl(ctx);
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} else if (tt == KW_VAR && depth == 1 && !is_enum) {
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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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int ftype = spl_type_parse(&ctx->tctx, ctx);
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char fname[256];
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spl_tok_copy_name(ftok, fname, sizeof(fname));
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if (ftype >= 0)
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spl_type_add_field(&ctx->tctx, container_type_idx, 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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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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int dtype = spl_type_parse(&ctx->tctx, 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(&ctx->tctx, container_type_idx, vname,
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dtype >= 0 ? dtype : -1);
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} else if (tt == TOK_EOF) {
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break;
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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(&ctx->tctx, container_type_idx, vname, -1);
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}
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} else {
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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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int ftype = spl_type_parse(&ctx->tctx, ctx);
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char fname[256];
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spl_tok_copy_name(ftok, fname, sizeof(fname));
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if (ftype >= 0)
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spl_type_add_field(&ctx->tctx, container_type_idx, 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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spl_type_compute_layout(&ctx->tctx, container_type_idx);
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parse_method_decl(ctx, container_type_idx);
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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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ctx->tctx.current_type_idx = saved_current;
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spl_type_compute_layout(&ctx->tctx, container_type_idx);
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}
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/* ============================================================
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* Parse type declaration
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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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int parent_type_idx = ctx->tctx.current_type_idx;
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if (peek(ctx)->type == KW_STRUCT) {
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advance(ctx);
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int ti = spl_type_struct(&ctx->tctx, tname);
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if (parent_type_idx >= 0)
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spl_type_add_nested(&ctx->tctx, parent_type_idx, tname, ti);
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skip_nl(ctx);
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parse_type_body(ctx, ti, 0);
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} else if (peek(ctx)->type == KW_UNION) {
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advance(ctx);
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int ti = spl_type_union(&ctx->tctx, tname);
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if (parent_type_idx >= 0)
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spl_type_add_nested(&ctx->tctx, parent_type_idx, tname, ti);
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skip_nl(ctx);
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parse_type_body(ctx, ti, 1);
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} else if (peek(ctx)->type == KW_ENUM) {
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advance(ctx);
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int ti = spl_type_enum(&ctx->tctx, tname);
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if (parent_type_idx >= 0)
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spl_type_add_nested(&ctx->tctx, parent_type_idx, tname, ti);
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skip_nl(ctx);
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parse_type_body(ctx, ti, 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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int base = spl_type_parse(&ctx->tctx, ctx);
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if (base >= 0) {
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spl_type_alias(&ctx->tctx, tname, base);
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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);
|
|
else if (peek(ctx)->type == KW_TYPE)
|
|
parse_type_decl(ctx);
|
|
break;
|
|
}
|
|
case TOK_AT:
|
|
case TOK_SHARP: {
|
|
int tt = peek(ctx)->type;
|
|
advance(ctx); /* @ or # */
|
|
skip_nl(ctx);
|
|
if (tt == TOK_AT) {
|
|
/* @extern(vm) fn ... */
|
|
if (peek(ctx)->type == KW_EXTERN) {
|
|
advance(ctx); /* extern */
|
|
skip_nl(ctx);
|
|
if (peek(ctx)->type == TOK_L_PAREN) {
|
|
advance(ctx); /* ( */
|
|
skip_nl(ctx);
|
|
advance(ctx); /* target name (e.g. "vm") */
|
|
skip_nl(ctx);
|
|
if (peek(ctx)->type == TOK_R_PAREN)
|
|
advance(ctx);
|
|
}
|
|
}
|
|
} else {
|
|
/* #[extern("vm")] fn ... (legacy) */
|
|
if (peek(ctx)->type == TOK_L_BRACKET) {
|
|
advance(ctx); /* [ */
|
|
while (peek(ctx)->type != TOK_R_BRACKET && peek(ctx)->type != TOK_EOF)
|
|
advance(ctx);
|
|
if (peek(ctx)->type == TOK_R_BRACKET)
|
|
advance(ctx);
|
|
}
|
|
}
|
|
skip_nl(ctx);
|
|
if (peek(ctx)->type == KW_FN)
|
|
parse_fn_decl(ctx, 1, 0);
|
|
break;
|
|
}
|
|
default: {
|
|
usize prev = ctx->tok_idx;
|
|
spl_parse_stmt(ctx);
|
|
if (ctx->tok_idx == prev)
|
|
advance(ctx);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|