From: Lukas Krickl <lukas@krickl.dev>
Date: Wed, 22 Nov 2023 19:40:46 +0000 (+0100)
Subject: WIP: universal instruction parser table
X-Git-Url: https://git.krickl.dev/?a=commitdiff_plain;h=7b1f17e588859b3cde839b6a0a5ab4739844aa41;p=ulas%2F.git

WIP: universal instruction parser table
---

diff --git a/include/ulas.h b/include/ulas.h
index b9f4b1f..e52b799 100644
--- a/include/ulas.h
+++ b/include/ulas.h
@@ -304,20 +304,38 @@ enum ulas_asmdir {
 
 enum ulas_asmregs {
   // r8
-  ULAS_REG_B = 0,
-  ULAS_REG_C = 1,
-  ULAS_REG_D = 2,
-  ULAS_REG_E = 3,
-  ULAS_REG_H = 4,
-  ULAS_REG_L = 5,
-
-  ULAS_REG_BC = 6,
-  // a has to be 7 because of instruction layours
+  ULAS_REG_B = 1,
+  ULAS_REG_C = 2,
+  ULAS_REG_D = 3,
+  ULAS_REG_E = 4,
+  ULAS_REG_H = 5,
+  ULAS_REG_L = 6,
   ULAS_REG_A = 7,
 
   // r16
-  ULAS_REG_DE = 8,
-  ULAS_REG_HL = 9
+  ULAS_REG_BC = 8,
+  ULAS_REG_DE = 9,
+  ULAS_REG_HL = 10
+};
+
+// special asm tokens for instr enum
+enum ulas_asmspetok { ULAS_E8 = -1, ULAS_E16 = -2 };
+
+#define ULAS_INSTRTOKMAX 16
+#define ULAS_INSTRDATMAX 16
+
+// entry for lut instruction parser
+// in the form of: name token token token token
+// tokens can either be literal chars, or any of the special tokens like an
+// asmreg or e8, e16
+// if toks value is 0 the list ends
+// if data value is 0 the list ends
+// if toks is E8 or E16 an expression is evaluated
+// id data is E8 or E16 the previous expression is inserted
+struct ulas_instr {
+  char *name;
+  short tokens[ULAS_INSTRTOKMAX];
+  short data[ULAS_INSTRDATMAX];
 };
 
 extern struct ulas_config ulascfg;
diff --git a/src/ulas.c b/src/ulas.c
index d7c4a2b..9307b15 100644
--- a/src/ulas.c
+++ b/src/ulas.c
@@ -1399,6 +1399,11 @@ int ulas_asmregisr8(enum ulas_asmregs reg) {
   return reg != ULAS_REG_BC && reg != ULAS_REG_DE && reg != ULAS_REG_HL;
 }
 
+// all instructions
+const struct ulas_instr ULASINSTRS[] = {
+    {"nop", {0}, {0x00, 0}},
+    {"ld", {ULAS_REG_B, ',', ULAS_REG_B, 0}, {0x40, 0}}};
+
 // adds an instruction that only comparse names
 #define ULAS_STATICINSTR(name, n, ...)                                         \
   if (strncmp(ulas.tok.buf, (name), ulas.tok.maxlen) == 0) {                   \