ISA parser: Simplify operand type handling.

This change simplifies the code surrounding operand type handling and makes it
depend only on the ctype that goes with each operand type. Future changes will
allow defining operand types by their ctypes directly, convert the ISAs over
to that style of definition, and then remove support for the old style. These
changes are to make it easier to use non-builtin types like classes or
structures as the type for operands.

1 files changed, 17 insertions, 80 deletions

diff --git a/src/arch/isa_parser.py b/src/arch/isa_parser.py
index 6cc113142..f52727a75 100755
--- a/src/arch/isa_parser.py
+++ b/src/arch/isa_parser.py
@@ -210,7 +210,6 @@ class Template(object):
             myDict['op_wb'] = op_wb_str
 
             if d.operands.memOperand:
-                myDict['mem_acc_size'] = d.operands.memOperand.mem_acc_size
                 myDict['mem_acc_type'] = d.operands.memOperand.mem_acc_type
 
         elif isinstance(d, dict):
@@ -417,29 +416,18 @@ class Operand(object):
         subst_dict = {"name": self.base_name,
                       "func": func,
                       "reg_idx": self.reg_spec,
-                      "size": self.size,
                       "ctype": self.ctype}
         if hasattr(self, 'src_reg_idx'):
             subst_dict['op_idx'] = self.src_reg_idx
         code = self.read_code % subst_dict
-        if self.size != self.dflt_size:
-            return '%s = bits(%s, %d, 0);\n' % \
-                   (self.base_name, code, self.size-1)
-        else:
-            return '%s = %s;\n' % \
-                   (self.base_name, code)
+        return '%s = %s;\n' % (self.base_name, code)
 
     def buildWriteCode(self, func = None):
-        if (self.size != self.dflt_size and self.is_signed):
-            final_val = 'sext<%d>(%s)' % (self.size, self.base_name)
-        else:
-            final_val = self.base_name
         subst_dict = {"name": self.base_name,
                       "func": func,
                       "reg_idx": self.reg_spec,
-                      "size": self.size,
                       "ctype": self.ctype,
-                      "final_val": final_val}
+                      "final_val": self.base_name}
         if hasattr(self, 'dest_reg_idx'):
             subst_dict['op_idx'] = self.dest_reg_idx
         code = self.write_code % subst_dict
@@ -448,7 +436,7 @@ class Operand(object):
             %s final_val = %s;
             %s;
             if (traceData) { traceData->setData(final_val); }
-        }''' % (self.dflt_ctype, final_val, code)
+        }''' % (self.dflt_ctype, self.base_name, code)
 
     def __init__(self, parser, full_name, ext, is_src, is_dest):
         self.full_name = full_name
@@ -463,17 +451,12 @@ class Operand(object):
             self.eff_ext = self.dflt_ext
 
         if hasattr(self, 'eff_ext'):
-            self.size, self.ctype, self.is_signed = \
-                        parser.operandTypeMap[self.eff_ext]
+            self.ctype = parser.operandTypeMap[self.eff_ext]
 
-        # note that mem_acc_size is undefined for non-mem operands...
+        # note that mem_acc_type is undefined for non-mem operands...
         # template must be careful not to use it if it doesn't apply.
         if self.isMem():
-            self.mem_acc_size = self.makeAccSize()
-            if self.ctype in ['Twin32_t', 'Twin64_t']:
-                self.mem_acc_type = 'Twin'
-            else:
-                self.mem_acc_type = 'uint'
+            self.mem_acc_type = self.ctype
 
     # Finalize additional fields (primarily code fields).  This step
     # is done separately since some of these fields may depend on the
@@ -556,34 +539,20 @@ class IntRegOperand(Operand):
             error('Attempt to read integer register as FP')
         if self.read_code != None:
             return self.buildReadCode('readIntRegOperand')
-        if (self.size == self.dflt_size):
-            return '%s = xc->readIntRegOperand(this, %d);\n' % \
-                   (self.base_name, self.src_reg_idx)
-        elif (self.size > self.dflt_size):
-            int_reg_val = 'xc->readIntRegOperand(this, %d)' % \
-                          (self.src_reg_idx)
-            if (self.is_signed):
-                int_reg_val = 'sext<%d>(%s)' % (self.dflt_size, int_reg_val)
-            return '%s = %s;\n' % (self.base_name, int_reg_val)
-        else:
-            return '%s = bits(xc->readIntRegOperand(this, %d), %d, 0);\n' % \
-                   (self.base_name, self.src_reg_idx, self.size-1)
+        int_reg_val = 'xc->readIntRegOperand(this, %d)' % self.src_reg_idx
+        return '%s = %s;\n' % (self.base_name, int_reg_val)
 
     def makeWrite(self):
         if (self.ctype == 'float' or self.ctype == 'double'):
             error('Attempt to write integer register as FP')
         if self.write_code != None:
             return self.buildWriteCode('setIntRegOperand')
-        if (self.size != self.dflt_size and self.is_signed):
-            final_val = 'sext<%d>(%s)' % (self.size, self.base_name)
-        else:
-            final_val = self.base_name
         wb = '''
         {
             %s final_val = %s;
             xc->setIntRegOperand(this, %d, final_val);\n
             if (traceData) { traceData->setData(final_val); }
-        }''' % (self.dflt_ctype, final_val, self.dest_reg_idx)
+        }''' % (self.ctype, self.base_name, self.dest_reg_idx)
         return wb
 
 class FloatRegOperand(Operand):
@@ -609,29 +578,16 @@ class FloatRegOperand(Operand):
             func = 'readFloatRegOperand'
         else:
             func = 'readFloatRegOperandBits'
-            if (self.size != self.dflt_size):
-                bit_select = 1
-        base = 'xc->%s(this, %d)' % (func, self.src_reg_idx)
         if self.read_code != None:
             return self.buildReadCode(func)
-        if bit_select:
-            return '%s = bits(%s, %d, 0);\n' % \
-                   (self.base_name, base, self.size-1)
-        else:
-            return '%s = %s;\n' % (self.base_name, base)
+        return '%s = xc->%s(this, %d);\n' % \
+            (self.base_name, func, self.src_reg_idx)
 
     def makeWrite(self):
-        final_val = self.base_name
-        final_ctype = self.ctype
         if (self.ctype == 'float' or self.ctype == 'double'):
             func = 'setFloatRegOperand'
-        elif (self.ctype == 'uint32_t' or self.ctype == 'uint64_t'):
-            func = 'setFloatRegOperandBits'
         else:
             func = 'setFloatRegOperandBits'
-            final_ctype = 'uint%d_t' % self.dflt_size
-            if (self.size != self.dflt_size and self.is_signed):
-                final_val = 'sext<%d>(%s)' % (self.size, self.base_name)
         if self.write_code != None:
             return self.buildWriteCode(func)
         wb = '''
@@ -639,7 +595,7 @@ class FloatRegOperand(Operand):
             %s final_val = %s;
             xc->%s(this, %d, final_val);\n
             if (traceData) { traceData->setData(final_val); }
-        }''' % (final_ctype, final_val, func, self.dest_reg_idx)
+        }''' % (self.ctype, self.base_name, func, self.dest_reg_idx)
         return wb
 
 class ControlRegOperand(Operand):
@@ -665,12 +621,8 @@ class ControlRegOperand(Operand):
             error('Attempt to read control register as FP')
         if self.read_code != None:
             return self.buildReadCode('readMiscRegOperand')
-        base = 'xc->readMiscRegOperand(this, %s)' % self.src_reg_idx
-        if self.size == self.dflt_size:
-            return '%s = %s;\n' % (self.base_name, base)
-        else:
-            return '%s = bits(%s, %d, 0);\n' % \
-                   (self.base_name, base, self.size-1)
+        return '%s = xc->readMiscRegOperand(this, %s);\n' % \
+            (self.base_name, self.src_reg_idx)
 
     def makeWrite(self):
         if (self.ctype == 'float' or self.ctype == 'double'):
@@ -694,9 +646,6 @@ class MemOperand(Operand):
         # Note that initializations in the declarations are solely
         # to avoid 'uninitialized variable' errors from the compiler.
         # Declare memory data variable.
-        if self.ctype in ['Twin32_t','Twin64_t']:
-            return "%s %s; %s.a = 0; %s.b = 0;\n" % \
-                   (self.ctype, self.base_name, self.base_name, self.base_name)
         return '%s %s = 0;\n' % (self.ctype, self.base_name)
 
     def makeRead(self):
@@ -709,11 +658,6 @@ class MemOperand(Operand):
             return self.buildWriteCode()
         return ''
 
-    # Return the memory access size *in bits*, suitable for
-    # forming a type via "uint%d_t".  Divide by 8 if you want bytes.
-    def makeAccSize(self):
-        return self.size
-
 class PCStateOperand(Operand):
     def makeConstructor(self):
         return ''
@@ -1851,26 +1795,21 @@ StaticInstPtr
         for (ext, (desc, size)) in user_dict.iteritems():
             if desc == 'signed int':
                 ctype = 'int%d_t' % size
-                is_signed = 1
             elif desc == 'unsigned int':
                 ctype = 'uint%d_t' % size
-                is_signed = 0
             elif desc == 'float':
-                is_signed = 1       # shouldn't really matter
                 if size == 32:
                     ctype = 'float'
                 elif size == 64:
                     ctype = 'double'
             elif desc == 'twin64 int':
-                is_signed = 0
                 ctype = 'Twin64_t'
             elif desc == 'twin32 int':
-                is_signed = 0
                 ctype = 'Twin32_t'
             if ctype == '':
                 error(parser, lineno,
                       'Unrecognized type description "%s" in user_dict')
-            operand_type[ext] = (size, ctype, is_signed)
+            operand_type[ext] = ctype
 
         self.operandTypeMap = operand_type
 
@@ -1916,10 +1855,8 @@ StaticInstPtr
             attrList = ['reg_spec', 'flags', 'sort_pri',
                         'read_code', 'write_code']
             if dflt_ext:
-                (dflt_size, dflt_ctype, dflt_is_signed) = \
-                            self.operandTypeMap[dflt_ext]
-                attrList.extend(['dflt_size', 'dflt_ctype',
-                                 'dflt_is_signed', 'dflt_ext'])
+                dflt_ctype = self.operandTypeMap[dflt_ext]
+                attrList.extend(['dflt_ctype', 'dflt_ext'])
             for attr in attrList:
                 tmp_dict[attr] = eval(attr)
             tmp_dict['base_name'] = op_name