From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Sun, 1 Oct 2023 10:12:55 +0000 (+0100)
Subject: manually revert damaged caused by jacob to pseudocode parser
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2b144dd3ce2f073c05f64e9c96da312a7bc8bab0;p=openpower-isa.git

manually revert damaged caused by jacob to pseudocode parser
the purpose of the parser database is to preserve precisely and exactly
the data that is read in, such that it is possible to re-write it
precisely and exactly

jacob had destroyed that extremely important requirement by making
unauthorized modifications to this fundamental low-level code.

jacobs task is now to review the reversions and re-implement the
otherwise extremely valuable enhancements, but this time in a
way that listens to the project leader and administrators
---

diff --git a/src/openpower/decoder/pseudo/pagereader.py b/src/openpower/decoder/pseudo/pagereader.py
index 9bb234de..80a1a4c9 100644
--- a/src/openpower/decoder/pseudo/pagereader.py
+++ b/src/openpower/decoder/pseudo/pagereader.py
@@ -221,7 +221,6 @@ class ISA:
         # all sections are mandatory so no need for a full LALR parser.
 
         l = lines.pop(0).rstrip()  # get first line
-        prefix_lines = 0
         while lines:
             if self.verbose:
                 print(l)
@@ -233,13 +232,11 @@ class ISA:
             if l.strip().startswith('<!--'):
                 # print ("skipping comment", l)
                 l = lines.pop(0).rstrip()  # get next line
-                prefix_lines += 1
                 continue
 
             # Ignore blank lines before the first #
             if len(l) == 0:
                 l = lines.pop(0).rstrip()  # get next line
-                prefix_lines += 1
                 continue
 
             # expect get heading
@@ -248,27 +245,23 @@ class ISA:
 
             # whitespace expected
             l = lines.pop(0).strip()
-            prefix_lines += 1
             if self.verbose:
                 print(repr(l))
             assert len(l) == 0, ("blank line not found %s" % l)
 
             # Form expected
             l = lines.pop(0).strip()
-            prefix_lines += 1
             assert l.endswith('-Form'), ("line with -Form expected %s" % l)
             d['form'] = l.split('-')[0]
 
             # whitespace expected
             l = lines.pop(0).strip()
-            prefix_lines += 1
             assert len(l) == 0, ("blank line not found %s" % l)
 
             # get list of opcodes
             opcodes = []
             while True:
                 l = lines.pop(0).strip()
-                prefix_lines += 1
                 if len(l) == 0:
                     break
                 assert l.startswith('*'), ("* not found in line %s" % l)
@@ -295,12 +288,10 @@ class ISA:
 
             # "Pseudocode" expected
             l = lines.pop(0).rstrip()
-            prefix_lines += 1
             assert l.startswith("Pseudo-code:"), ("pseudocode found %s" % l)
 
             # whitespace expected
             l = lines.pop(0).strip()
-            prefix_lines += 1
             if self.verbose:
                 print(repr(l))
             assert len(l) == 0, ("blank line not found %s" % l)
@@ -308,17 +299,9 @@ class ISA:
             extra_uninit_regs = OrderedSet()
 
             # get pseudocode
-
-            # fix parser line numbers by prepending the right number of
-            # blank lines to the parser input
-            li = [""] * prefix_lines
-            li += [l[4:]]  # first line detected with 4-space
+            li = []
             while True:
                 l = lines.pop(0).rstrip()
-                prefix_lines += 1
-                if len(l) == 0:
-                    li.append(l)
-                    break
                 re_match = re.fullmatch(r" *<!-- EXTRA_UNINIT_REGS:(.*)-->", l)
                 if re_match:
                     for i in re_match[1].split(' '):
@@ -327,8 +310,9 @@ class ISA:
                     li.append("")
                     continue
                 if l.strip().startswith('<!--'):
-                    li.append("")
                     continue
+                if len(l) == 0:
+                    break
                 assert l.startswith('    '), ("4spcs not found in line %s" % l)
                 l = l[4:]  # lose 4 spaces
                 li.append(l)
@@ -337,19 +321,16 @@ class ISA:
 
             # "Special Registers Altered" expected
             l = lines.pop(0).rstrip()
-            prefix_lines += 1
             assert l.startswith("Special"), ("special not found %s" % l)
 
             # whitespace expected
             l = lines.pop(0).strip()
-            prefix_lines += 1
             assert len(l) == 0, ("blank line not found %s" % l)
 
             # get special regs
             li = []
             while lines:
                 l = lines.pop(0).rstrip()
-                prefix_lines += 1
                 if len(l) == 0:
                     break
                 assert l.startswith('    '), ("4spcs not found in line %s" % l)
@@ -364,7 +345,6 @@ class ISA:
             # expect and drop whitespace and comments
             while lines:
                 l = lines.pop(0).rstrip()
-                prefix_lines += 1
                 if len(l) != 0 and not l.strip().startswith('<!--'):
                     break
 
@@ -389,8 +369,7 @@ class ISA:
         for k, v in self.instr.items():
             print("# %s %s" % (v.opcode, v.desc))
             print("Form: %s Regs: %s" % (v.form, v.regs))
-            pcode = filter(lambda x : len(x.strip()), v.pcode) # skip blank
-            print('\n'.join(map(lambda x: "    %s" % x, pcode)))
+            print('\n'.join(map(lambda x: "    %s" % x, v.pcode)))
             print("Specials")
             print('\n'.join(map(lambda x: "    %s" % x, v.sregs)))
             print()