assembler functional

[dcpu16] / as-dcpu16.h

diff --git a/as-dcpu16.h b/as-dcpu16.h
new file mode 100644 (file)
index 0000000..68bf54e
--- /dev/null
+++ b/as-dcpu16.h
@@ -0,0 +1,56 @@
+#ifndef AS_DCPU16_H_PTFNJB09
+#define AS_DCPU16_H_PTFNJB09
+
+#include "dcpu16.h"
+
+struct instruction_ {
+    char *label;  /* set if a label points here */
+    char *opcode; /* tokenized instruction text */
+    struct operand_ *operands;  /* list of operands */
+    unsigned int length; /* words */
+    unsigned int ready : 1; /* bytecode computed? */
+    DCPU16_WORD instr_words[];
+};
+
+
+enum operand_types_{
+    OT_DIRECT,  /* these operands simply render their contents into bytecode */
+    OT_NEXT,    /* these operands increase instruction length */
+    OT_LABEL    /* labels need to be computed then converted to other types */
+};
+
+struct operand_ {
+    struct operand_ *next;
+    char *operand; /* tokenized operand text */
+    enum operand_types_ type;
+    union {
+        DCPU16_WORD word_value;
+        struct instruction_ *label_destination;
+    } value;
+};
+
+
+#define IL_SIZE(entries) (((entries) * sizeof(struct instruction_ *)) + sizeof(struct instruction_list_))
+
+struct instruction_list_ {
+    size_t allocated;
+    size_t entries;
+    struct instruction_ *instr[];
+};
+
+
+/* note label table holds its own structs, not pointers */
+struct label_ {
+    char *label; /* name of label */
+    struct instruction_ *instr;
+};
+
+#define LL_SIZE(entries) (((entries) * sizeof(struct label_ *)) + sizeof(struct label_list_))
+
+struct label_list_ {
+    size_t allocated;
+    size_t entries;
+    struct label_ label[];
+};
+
+#endif /* AS_DCPU16_H_PTFNJB09 */