Most of a C implementation of jq

c/bytecode.c

@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <jansson.h>
+#include "bytecode.h"
+#include "opcode.h"
+
+void dump_disassembly(struct bytecode* bc) {
+  int pc = 0;
+  while (pc < bc->codelen) {
+    dump_operation(bc, bc->code + pc);
+    printf("\n");
+    pc += opcode_length(bc->code[pc]);
+  }
+}
+
+void dump_operation(struct bytecode* bc, uint16_t* codeptr) {
+  int pc = codeptr - bc->code;
+  printf("%04d ", pc);
+  const struct opcode_description* op = opcode_describe(bc->code[pc++]);
+  printf("%s", op->name);
+  if (op->flags & OP_HAS_IMMEDIATE) {
+    uint16_t imm = bc->code[pc++];
+    printf(" ");
+    if (op->flags & OP_HAS_BRANCH) {
+      printf("%04d", pc + imm);
+    } else if (op->flags & OP_HAS_CONSTANT) {
+      json_dumpf(json_array_get(bc->constants, imm),
+                 stdout, JSON_ENCODE_ANY);
+    } else if (op->flags & OP_HAS_VARIABLE) {
+      printf("v%d", imm);
+    } else {
+      printf("%d", imm);
+    }
+  }  
+}