C++ is just a giant pain in the ass

1 files changed, 43 insertions, 20 deletions

diff --git a/lib/dis.h b/lib/dis.h
index a45e5d0..9a87064 100644
--- a/lib/dis.h
+++ b/lib/dis.h
@@ -1,50 +1,62 @@
 #pragma once
 #include <stdbool.h>
+#include <stdint.h>
 
 #define UNUSED __attribute__((unused))
+#define INLINE __attribute__((always_inline)) inline 
+#ifdef __cplusplus
+#define CONSTEXPR constexpr
+#else
+#define CONSTEXPR
+#endif
 
 struct bitslice_run {
-    int inpos, outpos, len;
+    int8_t inpos, outpos, len;
 };
 
 struct bitslice {
-    int nruns;
-    const struct bitslice_run *runs;
+    int8_t nruns;
+    struct bitslice_run runs[6];
 };
 
 struct dis_data_operand {
-    struct bitslice n;
     bool out;
+    const struct bitslice *n;
 };
 
-static inline int sext(unsigned val, int bits) {
+static inline CONSTEXPR int sext(unsigned val, int bits) {
     return val & (1 << (bits - 1)) ? ((int)val - (1 << bits)) : (int)val;
 }
 
-static inline unsigned bs_get(struct bitslice bs, unsigned op) {
+static inline CONSTEXPR unsigned bs_get(const struct bitslice *bs, unsigned op) {
     unsigned ret = 0;
-    for(int i = 0; i < bs.nruns; i++) {
-        const struct bitslice_run *run = &bs.runs[i];
+    for(int i = 0; i < bs->nruns; i++) {
+        const struct bitslice_run *run = &bs->runs[i];
         unsigned val = (op >> run->inpos) & ((1 << run->len) - 1);
         ret |= val << run->outpos;
     }
     return ret;
 }
 
-static inline unsigned bs_set(struct bitslice bs, unsigned new, unsigned op) {
-    for(int i = 0; i < bs.nruns; i++) {
-        const struct bitslice_run *run = &bs.runs[i];
+static inline CONSTEXPR unsigned bs_set(const struct bitslice *bs, unsigned new_, unsigned op) {
+    for(int i = 0; i < bs->nruns; i++) {
+        const struct bitslice_run *run = &bs->runs[i];
         unsigned mask = (1 << run->len) - 1;
-        unsigned val = (new >> run->outpos) & mask;
+        unsigned val = (new_ >> run->outpos) & mask;
         op = (op & ~(mask << run->inpos)) | (val << run->inpos);
     }
     return op;
 }
 
-static inline struct bitslice bs_slice_(struct bitslice bs, struct bitslice_run *runs, int lo, int size) {
-    int nruns = 0;
-    for(int i = 0; i < bs.nruns; i++) {
-        struct bitslice_run inr = bs.runs[i];
+static inline CONSTEXPR struct bitslice bs_slice(const struct bitslice *bs, int lo, int size) {
+    struct bitslice obs
+    #ifdef __cplusplus
+    {}
+    #endif
+    ;
+    obs.nruns = 0;
+    for(int i = 0; i < bs->nruns; i++) {
+        struct bitslice_run inr = bs->runs[i];
         inr.outpos -= lo;
         if(inr.outpos < 0) {
             inr.len += inr.outpos;
@@ -54,10 +66,21 @@ static inline struct bitslice bs_slice_(struct bitslice bs, struct bitslice_run
         if(inr.outpos + inr.len > size)
             inr.len = size - inr.outpos;
         if(inr.len > 0)
-            runs[nruns++] = (struct bitslice_run) {inr.inpos, inr.outpos, inr.len};
+            obs.runs[obs.nruns++] = inr;
     }
-    return (struct bitslice) {nruns, runs};
+    return obs;
 }
-#define bs_slice(bs, lo, size) \
-    bs_slice_(bs, alloca((bs).nruns * sizeof(struct bitslice_run)), lo, size)
 
+
+#ifdef __cplusplus
+#define staticify(ty, ...) [&](){ constexpr static ty bs = __VA_ARGS__; return &bs; }()
+
+#define r(nn)           staticify(struct dis_data_operand, {.n = nn, .out = false})
+#define rs(nn, l, s)    staticify(struct dis_data_operand, {.n = staticify(struct bitslice, bs_slice(nn, l, s)), .out = false})
+#define rout(nn)        staticify(struct dis_data_operand, {.n = nn, .out = true})
+#define rsout(nn, l, s) staticify(struct dis_data_operand, {.n = staticify(struct bitslice, bs_slice(nn, l, s)), .out = true})
+
+#define data(...) return P(data)<__VA_ARGS__>(ctx);
+typedef const struct bitslice *BSP;
+
+#endif