From 89ee805a0c61e4c16c01f11bd80d4304c761ab59 Mon Sep 17 00:00:00 2001
From: Neel Gala <neelgala@incoresemi.com>
Date: Tue, 3 May 2022 11:27:13 +0530
Subject: [PATCH 1/3] adding support for Go code generation

---
 parse.py | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

diff --git a/parse.py b/parse.py
index 11fd1ba2..4903bedd 100755
--- a/parse.py
+++ b/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')

From 4fb045d71002b82cf15573c336743d8cdf6a9f87 Mon Sep 17 00:00:00 2001
From: Neel Gala <neelgala@incoresemi.com>
Date: Tue, 3 May 2022 11:28:31 +0530
Subject: [PATCH 2/3] readme update for Go support

---
 README.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index d65b0c77..5d346f62 100644
--- a/README.md
+++ b/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
 ```

From 4aba5dd473577015281484e876f0c922b30696ac Mon Sep 17 00:00:00 2001
From: Neel Gala <neelgala@incoresemi.com>
Date: Tue, 3 May 2022 11:28:57 +0530
Subject: [PATCH 3/3] actions update to generate Go in CI

---
 .github/workflows/python-app.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index 72a81281..2781ac55 100644
--- a/.github/workflows/python-app.yml
+++ b/.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