/*****************************************************************************/
/* */
-/* codeinfo.h */
+/* codeinfo.h */
/* */
-/* Additional information about code instructions */
+/* Additional information about 6502 code */
/* */
/* */
/* */
-/* (C) 2001 Ullrich von Bassewitz */
-/* Wacholderweg 14 */
-/* D-70597 Stuttgart */
-/* EMail: uz@musoftware.de */
+/* (C) 2001-2002 Ullrich von Bassewitz */
+/* Wacholderweg 14 */
+/* D-70597 Stuttgart */
+/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/*****************************************************************************/
-/* Data */
+/* Forwards */
/*****************************************************************************/
-/* Flags that tell what a specific instruction does with a register.
- * Please note that *changing* a register must not necessarily mean that the
- * value currently in the register is used. A prominent example is a load
- * instruction: It changes the register contents and does not use the old
- * value. On the flip side, a shift or something similar would use the
- * current value and change it.
- */
-#define CI_USE_NONE 0x0000U /* Use nothing */
-#define CI_USE_A 0x0001U /* Use the A register */
-#define CI_USE_X 0x0002U /* Use the X register */
-#define CI_USE_Y 0x0004U /* Use the Y register */
-#define CI_MASK_USE 0x000FU /* Extract usage info */
+struct CodeSeg;
+
+
+
+/*****************************************************************************/
+/* Data */
+/*****************************************************************************/
+
-#define CI_CHG_NONE 0x0000U /* Change nothing */
-#define CI_CHG_A 0x0010U /* Change the A register */
-#define CI_CHG_X 0x0020U /* Change the X register */
-#define CI_CHG_Y 0x0040U /* Change the Y register */
-#define CI_MASK_CHG 0x00F0U /* Extract change info */
-
-#define CI_BRA 0x0100U /* Instruction is a branch */
-#define CI_MASK_BRA 0x0100U /* Extract branch info */
-#define CI_NONE 0x0000U /* Nothing used/changed */
+/* Forward to struct RegContents */
+struct RegContents;
+
+/* Defines for registers. */
+#define REG_NONE 0x0000U
+#define REG_A 0x0001U
+#define REG_X 0x0002U
+#define REG_Y 0x0004U
+#define REG_TMP1 0x0008U
+#define REG_PTR1_LO 0x0010U
+#define REG_PTR1_HI 0x0020U
+#define REG_PTR2_LO 0x0040U
+#define REG_PTR2_HI 0x0080U
+#define REG_SREG_LO 0x0100U
+#define REG_SREG_HI 0x0200U
+#define REG_SAVE_LO 0x0400U
+#define REG_SAVE_HI 0x0800U
+#define REG_SP_LO 0x1000U
+#define REG_SP_HI 0x2000U
+
+
+/* Combined register defines */
+#define REG_PTR1 (REG_PTR1_LO | REG_PTR1_HI)
+#define REG_PTR2 (REG_PTR2_LO | REG_PTR2_HI)
+#define REG_SREG (REG_SREG_LO | REG_SREG_HI)
+#define REG_SAVE (REG_SAVE_LO | REG_SAVE_HI)
+#define REG_SP (REG_SP_LO | REG_SP_HI)
+#define REG_AX (REG_A | REG_X)
+#define REG_AY (REG_A | REG_Y)
+#define REG_XY (REG_X | REG_Y)
+#define REG_AXY (REG_AX | REG_Y)
+#define REG_EAX (REG_AX | REG_SREG)
+#define REG_EAXY (REG_EAX | REG_Y)
+#define REG_ZP 0xFFF8U
+#define REG_ALL 0xFFFFU
+
+
+
+/* Zero page register info */
+typedef struct ZPInfo ZPInfo;
+struct ZPInfo {
+ unsigned char Len; /* Length of the following string */
+ char Name[11]; /* Name of zero page symbol */
+ unsigned short ByteUse; /* Register info for this symbol */
+ unsigned short WordUse; /* Register info for 16 bit access */
+};
+
+
+
+/* Defines for the conditions in a compare */
+typedef enum {
+ CMP_INV = -1,
+ CMP_EQ,
+ CMP_NE,
+ CMP_GT,
+ CMP_GE,
+ CMP_LT,
+ CMP_LE,
+ CMP_UGT,
+ CMP_UGE,
+ CMP_ULT,
+ CMP_ULE
+} cmp_t;
/*****************************************************************************/
-/* Code */
+/* Code */
/*****************************************************************************/
+void GetFuncInfo (const char* Name, unsigned short* Use, unsigned short* Chg);
+/* For the given function, lookup register information and store it into
+ * the given variables. If the function is unknown, assume it will use and
+ * load all registers.
+ */
+
+const ZPInfo* GetZPInfo (const char* Name);
+/* If the given name is a zero page symbol, return a pointer to the info
+ * struct for this symbol, otherwise return NULL.
+ */
+
+unsigned GetRegInfo (struct CodeSeg* S, unsigned Index, unsigned Wanted);
+/* Determine register usage information for the instructions starting at the
+ * given index.
+ */
+
+int RegAUsed (struct CodeSeg* S, unsigned Index);
+/* Check if the value in A is used. */
+
+int RegXUsed (struct CodeSeg* S, unsigned Index);
+/* Check if the value in X is used. */
+
+int RegYUsed (struct CodeSeg* S, unsigned Index);
+/* Check if the value in Y is used. */
+
+int RegAXUsed (struct CodeSeg* S, unsigned Index);
+/* Check if the value in A or(!) the value in X are used. */
+
+int RegEAXUsed (struct CodeSeg* S, unsigned Index);
+/* Check if any of the four bytes in EAX are used. */
+
+unsigned GetKnownReg (unsigned Use, const struct RegContents* RC);
+/* Return the register or zero page location from the set in Use, thats
+ * contents are known. If Use does not contain any register, or if the
+ * register in question does not have a known value, return REG_NONE.
+ */
+
+cmp_t FindBoolCmpCond (const char* Name);
+/* Check if the given string is the name of one of the boolean transformer
+ * subroutine, and if so, return the condition that is evaluated by this
+ * routine. Return CMP_INV if the condition is not recognised.
+ */
+
+cmp_t FindTosCmpCond (const char* Name);
+/* Check if this is a call to one of the TOS compare functions (tosgtax).
+ * Return the condition code or CMP_INV on failure.
+ */
+
+
+
/* End of codeinfo.h */
#endif
+
projects / cc65 / blobdiff