Merge pull request riscv#110 from incoresemi/support-for-go

Support for Go language code generation

.github/workflows/python-app.yml

@@ -18,6 +18,6 @@ jobs:
     - name: Install PyYAML
       run: pip3 install -r requirements.txt
     - name: Generation C code
-      run: ./parse.py -c -chisel -sverilog -rust -latex "rv*" "unratified/rv*"
+      run: ./parse.py -c -chisel -sverilog -rust -latex -spinalhdl -go "rv*" "unratified/rv*"
     - name: Check C output
       run: cat encoding.out.h  | cpp

README.md

@@ -125,6 +125,7 @@ The following artifacts can be generated using parse.py:
 - inst.sverilog : system verilog code to decode instructions
 - inst.rs : rust code containing mask and match variables for all instructions
 - inst.spinalhdl : spinalhdl code to decode instructions
+- inst.go : go code to decode instructions
 
 Make sure you install the required python pre-requisites are installed by executing the following
 command:
@@ -137,12 +138,14 @@ pip3 install -r requirements.txt
 To generate all the above artifacts for all instructions currently checked in, simply run `make` from the root-directory. This should print the following log on the command-line:
 
 ```
-Running with args : ['./parse.py', '-c', '-chisel', '-sverilog', '-rust', '-latex', 'rv*', 'unratified/rv*']
+Running with args : ['./parse.py', '-c', '-go', '-chisel', '-sverilog', '-rust', '-latex', '-spinalhdl', 'rv*', 'unratified/rv*']
 Extensions selected : ['rv*', 'unratified/rv*']
 INFO:: encoding.out.h generated successfully
 INFO:: inst.chisel generated successfully
+INFO:: inst.spinalhdl generated successfully
 INFO:: inst.sverilog generated successfully
 INFO:: inst.rs generated successfully
+INFO:: inst.go generated successfully
 INFO:: instr-table.tex generated successfully
 INFO:: priv-instr-table.tex generated successfully
 ```

parse.py

@@ -839,11 +839,57 @@ def make_c(instr_dict):
 ''')
     enc_file.close()
 
+def make_go(instr_dict):
+    prelude = '''// Code generated by parse_opcodes -go; DO NOT EDIT.
+
+package riscv
+
+import "cmd/internal/obj"
+
+type inst struct {
+	opcode uint32
+	funct3 uint32
+	rs2    uint32
+	csr    int64
+	funct7 uint32
+}
+
+func encode(a obj.As) *inst {
+	switch a {
+'''
+    endoffile = '''  }
+	return nil
+}
+'''
+    instr_str = ''
+    for i in instr_dict:
+        enc_match = int(instr_dict[i]['match'],0)
+        opcode = (enc_match >> 0) & ((1<<7)-1)
+        funct3 = (enc_match >> 12) & ((1<<3)-1)
+        rs2 = (enc_match >> 20) & ((1<<5)-1)
+        csr = (enc_match >> 20) & ((1<<12)-1)
+        funct7 = (enc_match >> 25) & ((1<<7)-1)
+        instr_str += f'''  case A{i.upper().replace("_","")}:
+    return &inst{{ {hex(opcode)}, {hex(funct3)}, {hex(rs2)}, {signed(csr,12)}, {hex(funct7)} }}
+'''
+
+    with open('inst.go','w') as file:
+        file.write(prelude)
+        file.write(instr_str)
+        file.write(endoffile)
+
+def signed(value, width):
+  if 0 <= value < (1<<(width-1)):
+    return value
+  else:
+    return value - (1<<width)
+
+
 if __name__ == "__main__":
     print(f'Running with args : {sys.argv}')
 
     extensions = sys.argv[1:]
-    for i in ['-c','-latex','-chisel','-sverilog','-rust']:
+    for i in ['-c','-latex','-chisel','-sverilog','-rust', '-go', '-spinalhdl']:
         if i in extensions:
             extensions.remove(i)
     print(f'Extensions selected : {extensions}')
@@ -872,6 +918,10 @@ def make_c(instr_dict):
         make_rust(instr_dict)
         logging.info('inst.rs generated successfully')
 
+    if '-go' in sys.argv[1:]:
+        make_go(instr_dict)
+        logging.info('inst.go generated successfully')
+
     if '-latex' in sys.argv[1:]:
         make_latex_table()
         logging.info('instr-table.tex generated successfully')