From c455e7b67d2e55e6ed03e3449203d4e307f5a7dd Mon Sep 17 00:00:00 2001
From: Bruce Hill <bruce@bruce-hill.com>
Date: Fri, 13 Sep 2024 20:18:08 -0400
Subject: Rename builtins/ -> stdlib/

---
 stdlib/datatypes.h | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 stdlib/datatypes.h

(limited to 'stdlib/datatypes.h')

diff --git a/stdlib/datatypes.h b/stdlib/datatypes.h
new file mode 100644
index 00000000..8c13d3c4
--- /dev/null
+++ b/stdlib/datatypes.h
@@ -0,0 +1,91 @@
+#pragma once
+
+// Common datastructures (arrays, tables, closures)
+
+#include <gmp.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <pthread.h>
+
+#define ARRAY_LENGTH_BITS 42
+#define ARRAY_FREE_BITS 6
+#define ARRAY_REFCOUNT_BITS 3
+#define ARRAY_STRIDE_BITS 12
+
+#define MAX_FOR_N_BITS(N) ((1<<(N))-1)
+#define ARRAY_MAX_STRIDE MAX_FOR_N_BITS(ARRAY_STRIDE_BITS-1)
+#define ARRAY_MIN_STRIDE (~MAX_FOR_N_BITS(ARRAY_STRIDE_BITS-1))
+#define ARRAY_MAX_DATA_REFCOUNT MAX_FOR_N_BITS(ARRAY_REFCOUNT_BITS)
+#define ARRAY_MAX_FREE_ENTRIES MAX_FOR_N_BITS(ARRAY_FREE_BITS)
+
+typedef union {
+    int64_t small;
+    mpz_t *big;
+} Int_t;
+
+typedef struct {
+    void *data;
+    // All of the following fields add up to 64 bits, which means that array
+    // structs can be passed in two 64-bit registers. C will handle doing the
+    // bit arithmetic to extract the necessary values, which is cheaper than
+    // spilling onto the stack and needing to retrieve data from the stack.
+    int64_t length:ARRAY_LENGTH_BITS;
+    uint8_t free:ARRAY_FREE_BITS;
+    bool atomic:1;
+    uint8_t data_refcount:ARRAY_REFCOUNT_BITS;
+    int16_t stride:ARRAY_STRIDE_BITS;
+} Array_t;
+
+typedef struct {
+    uint32_t occupied:1, index:31;
+    uint32_t next_bucket;
+} bucket_t;
+
+#define TABLE_MAX_BUCKETS 0x7fffffff
+#define TABLE_MAX_DATA_REFCOUNT 3
+
+typedef struct {
+    uint32_t count:31, last_free:31;
+    uint8_t data_refcount:2;
+    bucket_t buckets[];
+} bucket_info_t;
+
+typedef struct table_s {
+    Array_t entries;
+    bucket_info_t *bucket_info;
+    struct table_s *fallback;
+} Table_t;
+
+typedef struct {
+    void *fn, *userdata;
+} Closure_t;
+
+typedef struct Range_s {
+    Int_t first, last, step;
+} Range_t;
+
+typedef struct {
+    Array_t items;
+    pthread_mutex_t mutex;
+    pthread_cond_t cond;
+    int64_t max_size;
+} Channel_t;
+
+enum text_type { TEXT_SHORT_ASCII, TEXT_ASCII, TEXT_SHORT_GRAPHEMES, TEXT_GRAPHEMES, TEXT_SUBTEXT };
+
+typedef struct Text_s {
+    int64_t length; // Number of grapheme clusters
+    uint64_t hash:61;
+    uint8_t tag:3;
+    union {
+        char short_ascii[8];
+        const char *ascii;
+        int32_t short_graphemes[2];
+        const int32_t *graphemes;
+        struct Text_s *subtexts;
+    };
+} Text_t;
+
+#define Pattern_t Text_t
+
+// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0
-- 
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