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src/code.h

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+/****************************************************/
+/* File: code.h                                     */
+/* Code emitting utilities for the TINY compiler    */
+/* and interface to the TM machine                  */
+/* Compiler Construction: Principles and Practice   */
+/* Kenneth C. Louden                                */
+/****************************************************/
+
+#ifndef _CODE_H_
+#define _CODE_H_
+
+/* pc = program counter  */
+#define  pc 7
+
+/* mp = "memory pointer" points
+ * to top of memory (for temp storage)
+ */
+#define  mp 6
+
+/* gp = "global pointer" points
+ * to bottom of memory for (global)
+ * variable storage
+ */
+#define gp 5
+
+/* accumulator */
+#define  ac 0
+
+/* 2nd accumulator */
+#define  ac1 1
+
+/* code emitting utilities */
+
+/* Procedure emitComment prints a comment line 
+ * with comment c in the code file
+ */
+void emitComment( char * c );
+
+/* Procedure emitRO emits a register-only
+ * TM instruction
+ * op = the opcode
+ * r = target register
+ * s = 1st source register
+ * t = 2nd source register
+ * c = a comment to be printed if TraceCode is TRUE
+ */
+void emitRO( char *op, int r, int s, int t, char *c);
+
+/* Procedure emitRM emits a register-to-memory
+ * TM instruction
+ * op = the opcode
+ * r = target register
+ * d = the offset
+ * s = the base register
+ * c = a comment to be printed if TraceCode is TRUE
+ */
+void emitRM( char * op, int r, int d, int s, char *c);
+
+/* Function emitSkip skips "howMany" code
+ * locations for later backpatch. It also
+ * returns the current code position
+ */
+int emitSkip( int howMany);
+
+/* Procedure emitBackup backs up to 
+ * loc = a previously skipped location
+ */
+void emitBackup( int loc);
+
+/* Procedure emitRestore restores the current 
+ * code position to the highest previously
+ * unemitted position
+ */
+void emitRestore(void);
+
+/* Procedure emitRM_Abs converts an absolute reference 
+ * to a pc-relative reference when emitting a
+ * register-to-memory TM instruction
+ * op = the opcode
+ * r = target register
+ * a = the absolute location in memory
+ * c = a comment to be printed if TraceCode is TRUE
+ */
+void emitRM_Abs( char *op, int r, int a, char * c);
+
+#endif