Added stub C simulator (defined dumb-down syntax for netlists).

1 files changed, 116 insertions, 0 deletions

diff --git a/csim/sim.h b/csim/sim.h
new file mode 100644
index 0000000..75f3502
--- /dev/null
+++ b/csim/sim.h
@@ -0,0 +1,116 @@
+#ifndef DEF_SIM_H
+#define DEF_SIM_H
+
+// TODO implement ROM
+
+#include <stdio.h>
+
+// Gate types
+#define C_ARG 0
+#define C_REG 1
+#define C_NOT 2
+#define C_BINOP 3
+#define C_MUX 4
+#define C_ROM 5
+#define C_RAM 6
+#define C_CONCAT 7
+#define C_SLICE 8
+#define C_SELECT 9
+
+// Binary operators
+#define OP_OR 0
+#define OP_XOR 1
+#define OP_AND 2
+#define OP_NAND 3
+
+// Data structures
+typedef unsigned long long int t_value;
+typedef int t_id;
+
+typedef struct {		// a variable in the simulator
+	t_value mask;
+	int size;
+	char *name;
+} t_variable;
+
+typedef struct {
+	t_value val;
+	t_id source_var;		// if source_var == -1 then it's a direct value, else it's that variable
+} t_arg;
+
+typedef struct {
+	int type;
+	t_id dest_var;
+	union {
+		struct {
+			t_arg a;
+		} Arg;
+		struct {
+			t_id var;
+		} Reg;
+		struct {
+			t_arg a;
+		} Not;
+		struct {
+			int op;
+			t_arg a, b;
+		} Binop;
+		struct {
+			t_arg a, b, c;
+		} Mux;
+		struct {
+			int addr_size, word_size;
+			t_arg read_addr;
+		} Rom;
+		struct {
+			int addr_size, word_size;
+			t_arg read_addr, write_enable, write_addr, data;
+		} Ram;
+		struct {
+			t_arg a, b;
+		} Concat;
+		struct {
+			int begin, end;
+			t_arg source;
+		} Slice;
+		struct {
+			int i;
+			t_arg source;
+		} Select;
+	};
+} t_equation;
+
+
+typedef struct {
+	int n_vars, n_inputs, n_outputs;
+	t_variable *vars;
+	t_id *inputs, *outputs;
+
+	int n_eqs;
+	t_equation *eqs;
+} t_program;
+
+// machine = execution instance
+
+typedef union {
+	t_value r_val;
+	t_value *mem_val;
+} t_mem_reg_data;
+
+typedef struct {
+	t_program *prog;
+	t_value *var_values;
+	t_mem_reg_data *mem_data;
+} t_machine;
+
+
+// The functions for doing stuff with these data structures
+
+t_program *load_dumb_netlist(FILE *stream);
+t_machine *init_machine(t_program *p);
+void read_inputs(t_machine *m, FILE *stream);
+void machine_step(t_machine *m);
+void write_outputs(t_machine *m, FILE *stream);
+
+
+#endif