[PATCH 3/6] scripts/decodetree: Pass lvalue-formatter function to str_extract()

[Peter Maydell <peter.maydell@linaro.org>]

To support referring to other named fields in field definitions, we
need to pass the str_extract() method a function which tells it how
to emit the code for a previously initialized named field.  (In
Pattern::output_code() the other field will be "u.f_foo.field", and
in Format::output_extract() it is "a->field".)

Refactor the two callsites that currently do "output code to
initialize each field", and have them pass a lambda that defines how
to format the lvalue in each case.  This is then used both in
emitting the LHS of the assignment and also passed down to
str_extract() as a new argument (unused at the moment, but will be
used in the following patch).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 scripts/decodetree.py | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/scripts/decodetree.py b/scripts/decodetree.py
index a03dc6b5e3e..33f4252b4ee 100644
--- a/scripts/decodetree.py
+++ b/scripts/decodetree.py
@@ -205,7 +205,7 @@ def __str__(self):
             s = ''
         return str(self.pos) + ':' + s + str(self.len)
 
-    def str_extract(self):
+    def str_extract(self, lvalue_formatter):
         global bitop_width
         s = 's' if self.sign else ''
         return f'{s}extract{bitop_width}(insn, {self.pos}, {self.len})'
@@ -228,12 +228,12 @@ def __init__(self, subs, mask):
     def __str__(self):
         return str(self.subs)
 
-    def str_extract(self):
+    def str_extract(self, lvalue_formatter):
         global bitop_width
         ret = '0'
         pos = 0
         for f in reversed(self.subs):
-            ext = f.str_extract()
+            ext = f.str_extract(lvalue_formatter)
             if pos == 0:
                 ret = ext
             else:
@@ -264,7 +264,7 @@ def __init__(self, value):
     def __str__(self):
         return str(self.value)
 
-    def str_extract(self):
+    def str_extract(self, lvalue_formatter):
         return str(self.value)
 
     def __cmp__(self, other):
@@ -283,8 +283,9 @@ def __init__(self, func, base):
     def __str__(self):
         return self.func + '(' + str(self.base) + ')'
 
-    def str_extract(self):
-        return self.func + '(ctx, ' + self.base.str_extract() + ')'
+    def str_extract(self, lvalue_formatter):
+        return (self.func + '(ctx, '
+                + self.base.str_extract(lvalue_formatter) + ')')
 
     def __eq__(self, other):
         return self.func == other.func and self.base == other.base
@@ -304,7 +305,7 @@ def __init__(self, func):
     def __str__(self):
         return self.func
 
-    def str_extract(self):
+    def str_extract(self, lvalue_formatter):
         return self.func + '(ctx)'
 
     def __eq__(self, other):
@@ -357,6 +358,11 @@ def __str__(self):
 
     def str1(self, i):
         return str_indent(i) + self.__str__()
+
+    def output_fields(self, indent, lvalue_formatter):
+        for n, f in self.fields.items():
+            output(indent, lvalue_formatter(n), ' = ',
+                   f.str_extract(lvalue_formatter), ';\n')
 # end General
 
 
@@ -370,8 +376,7 @@ def extract_name(self):
     def output_extract(self):
         output('static void ', self.extract_name(), '(DisasContext *ctx, ',
                self.base.struct_name(), ' *a, ', insntype, ' insn)\n{\n')
-        for n, f in self.fields.items():
-            output('    a->', n, ' = ', f.str_extract(), ';\n')
+        self.output_fields(str_indent(4), lambda n: 'a->' + n)
         output('}\n\n')
 # end Format
 
@@ -395,8 +400,7 @@ def output_code(self, i, extracted, outerbits, outermask):
         if not extracted:
             output(ind, self.base.extract_name(),
                    '(ctx, &u.f_', arg, ', insn);\n')
-        for n, f in self.fields.items():
-            output(ind, 'u.f_', arg, '.', n, ' = ', f.str_extract(), ';\n')
+        self.output_fields(ind, lambda n: 'u.f_' + arg + '.' + n)
         output(ind, 'if (', translate_prefix, '_', self.name,
                '(ctx, &u.f_', arg, ')) return true;\n')
 
-- 
2.34.1