Working on the backend

[cc65] / src / cc65 / codeinfo.h

diff --git a/src/cc65/codeinfo.h b/src/cc65/codeinfo.h
index 786652a01da48a681e59f399fd18cb43c37c54ff..edd5929d8b8fc8e6c58fd752f01ea109f4212e92 100644 (file)
--- a/src/cc65/codeinfo.h
+++ b/src/cc65/codeinfo.h
@@ -2,14 +2,14 @@
 /*                                                                           */
 /*                               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      Ullrich von Bassewitz                                       */
+/*               Wacholderweg 14                                             */
+/*               D-70597 Stuttgart                                           */
+/* EMail:        uz@cc65.org                                                 */
 /*                                                                           */
 /*                                                                           */
 /* This software is provided 'as-is', without any expressed or implied       */
@@ -39,34 +39,37 @@
 
 
 /*****************************************************************************/
-/*                                  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 */
+
+/* Defines for registers. */
+#define REG_NONE       0x00U
+#define REG_A          0x01U
+#define REG_X          0x02U
+#define REG_Y          0x04U
+#define REG_SREG_LO    0x08U
+#define REG_SREG_HI    0x10U
+#define REG_TMP1       0x20U
+#define REG_PTR1_LO    0x40U
+#define REG_PTR1_HI    0x80U
+#define        REG_AX          (REG_A | REG_X)
+#define REG_EAX         (REG_A | REG_X | REG_SREG_LO | REG_SREG_HI)
+#define REG_XY         (REG_X | REG_Y)
+#define REG_AXY                (REG_A | REG_X | REG_Y)
+#define REG_SREG        (REG_SREG_LO | REG_SREG_HI)
+#define REG_PTR1        (REG_PTR1_LO | REG_PTR1_HI)
 
 
 
@@ -76,8 +79,34 @@
 
 
 
+void GetFuncInfo (const char* Name, unsigned char* Use, unsigned char* 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.
+ */
+
+int IsZPName (const char* Name);
+/* Return true if the given name is a zero page symbol */
+
+unsigned char GetRegInfo (struct CodeSeg* S, unsigned Index);
+/* 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. */
+
+
+
 /* End of codeinfo.h */
 #endif
 
 
 
+