Enable building only selected CPU models via new scons

CPU_MODELS parameter.  For example:
scons CPU_MODELS="SimpleCPU,FullCPU" ALPHA_SE/m5.debug
Unfortunately the option is not sticky due to a scons
bug with saving & restoring ListOption parameters.

SConscript:
    Separate out cpu-model-specific files so they can be conditionally
    included based on value of new CPU_MODELS parameter.
    Most of these are now handled in cpu/SConscript, except for FullCPU
    which is still in this file.
arch/SConscript:
    The set of CPU-model-specific execute files must now be
    determined from the CPU_MODELS parameter, via the new
    cpu_models.py file.
    Also pass the list of configured CPU models to isa_parser.py.
arch/isa_parser.py:
    Move CpuModel definition and objects out to a
    separate file so they can be shared with scons.
    Global list of CPU models to generate code for is now
    controlled by command-line parameters (so we can do
    only a subset of the available ones).
build/SConstruct:
    Define new CPU_MODELS ListOption.
cpu/static_inst.hh:
    Rename static_inst_impl.hh to static_inst_exec_sigs.hh.

--HG--
extra : convert_revision : 163df32a76d4c05900490b2bce4c7962a5e3f614

2 files changed, 24 insertions, 54 deletions

diff --git a/arch/SConscript b/arch/SConscript
index 51f6cc023..d237b0b1f 100644
--- a/arch/SConscript
+++ b/arch/SConscript
@@ -108,26 +108,27 @@ env.Append(SCANNERS = iscan)
 # output from the ISA description (*.isa) files.
 #
 
-# several files are generated from the ISA description
-isa_desc_gen_files = Split('''
-	decoder.cc
-        alpha_o3_exec.cc
-	fast_cpu_exec.cc
-        simple_cpu_exec.cc
-        full_cpu_exec.cc
-	decoder.hh
-        ''')
-
 # Convert to File node to fix path
 isa_parser = File('isa_parser.py')
+cpu_models_file = File('#m5/cpu/cpu_models.py')
+
+# This sucks in the defintions of the CpuModel objects.
+execfile(cpu_models_file.srcnode().abspath)
+
+# Several files are generated from the ISA description.
+# We always get the basic decoder and header file.
+isa_desc_gen_files = Split('decoder.cc decoder.hh')
+# We also get an execute file for each selected CPU model.
+isa_desc_gen_files += [CpuModel.dict[cpu].filename
+                       for cpu in env['CPU_MODELS']]
 
 # The emitter patches up the sources & targets to include the
 # autogenerated files as targets and isa parser itself as a source.
 def isa_desc_emitter(target, source, env):
-    return (isa_desc_gen_files, [isa_parser] + source)
+    return (isa_desc_gen_files, [isa_parser, cpu_models_file] + source)
 
 # Pieces are in place, so create the builder.
-isa_desc_builder = Builder(action='${SOURCES[0]} ${SOURCES[1]} $TARGET.dir',
+isa_desc_builder = Builder(action='$SOURCES $TARGET.dir $CPU_MODELS',
                            source_scanner = iscan,
                            emitter = isa_desc_emitter)
 
diff --git a/arch/isa_parser.py b/arch/isa_parser.py
index a2bf31a0c..6508ca02a 100755
--- a/arch/isa_parser.py
+++ b/arch/isa_parser.py
@@ -712,43 +712,6 @@ yacc.yacc()
 #
 #####################################################################
 
-################
-# CpuModel class
-#
-# The CpuModel class encapsulates everything we need to know about a
-# particular CPU model.
-
-class CpuModel:
-    # List of all CPU models.  Accessible as CpuModel.list.
-    list = []
-
-    # Constructor.  Automatically adds models to CpuModel.list.
-    def __init__(self, name, filename, includes, strings):
-        self.name = name
-        self.filename = filename   # filename for output exec code
-        self.includes = includes   # include files needed in exec file
-        # The 'strings' dict holds all the per-CPU symbols we can
-        # substitute into templates etc.
-        self.strings = strings
-        # Add self to list.
-        CpuModel.list.append(self)
-
-# Define CPU models.  The following lines should contain the only
-# CPU-model-specific information in this file.  Note that the ISA
-# description itself should have *no* CPU-model-specific content.
-CpuModel('SimpleCPU', 'simple_cpu_exec.cc',
-         '#include "cpu/simple/cpu.hh"',
-         { 'CPU_exec_context': 'SimpleCPU' })
-CpuModel('FastCPU', 'fast_cpu_exec.cc',
-         '#include "cpu/fast/cpu.hh"',
-         { 'CPU_exec_context': 'FastCPU' })
-CpuModel('FullCPU', 'full_cpu_exec.cc',
-         '#include "encumbered/cpu/full/dyn_inst.hh"',
-         { 'CPU_exec_context': 'DynInst' })
-CpuModel('AlphaFullCPU', 'alpha_o3_exec.cc',
-         '#include "cpu/o3/alpha_dyn_inst.hh"',
-         { 'CPU_exec_context': 'AlphaDynInst<AlphaSimpleImpl>' })
-
 # Expand template with CPU-specific references into a dictionary with
 # an entry for each CPU model name.  The entry key is the model name
 # and the corresponding value is the template with the CPU-specific
@@ -757,7 +720,7 @@ def expand_cpu_symbols_to_dict(template):
     # Protect '%'s that don't go with CPU-specific terms
     t = re.sub(r'%(?!\(CPU_)', '%%', template)
     result = {}
-    for cpu in CpuModel.list:
+    for cpu in cpu_models:
         result[cpu.name] = t % cpu.strings
     return result
 
@@ -816,7 +779,7 @@ class GenCode:
     # concatenates all the individual strings in the operands.
     def __add__(self, other):
         exec_output = {}
-        for cpu in CpuModel.list:
+        for cpu in cpu_models:
             n = cpu.name
             exec_output[n] = self.exec_output[n] + other.exec_output[n]
         return GenCode(self.header_output + other.header_output,
@@ -830,7 +793,7 @@ class GenCode:
         self.header_output = pre + self.header_output
         self.decoder_output  = pre + self.decoder_output
         self.decode_block = pre + self.decode_block
-        for cpu in CpuModel.list:
+        for cpu in cpu_models:
             self.exec_output[cpu.name] = pre + self.exec_output[cpu.name]
 
     # Wrap the decode block in a pair of strings (e.g., 'case foo:'
@@ -1789,7 +1752,7 @@ def parse_isa_desc(isa_desc_file, output_dir):
     update_if_needed(output_dir + '/decoder.cc', file_template % vars())
 
     # generate per-cpu exec files
-    for cpu in CpuModel.list:
+    for cpu in cpu_models:
         includes = '#include "decoder.hh"\n'
         includes += cpu.includes
         global_output = global_code.exec_output[cpu.name]
@@ -1798,6 +1761,12 @@ def parse_isa_desc(isa_desc_file, output_dir):
         update_if_needed(output_dir + '/' + cpu.filename,
                           file_template % vars())
 
+# global list of CpuModel objects (see cpu_models.py)
+cpu_models = []
+
 # Called as script: get args from command line.
+# Args are: <path to cpu_models.py> <isa desc file> <output dir> <cpu models>
 if __name__ == '__main__':
-    parse_isa_desc(sys.argv[1], sys.argv[2])
+    execfile(sys.argv[1])  # read in CpuModel definitions
+    cpu_models = [CpuModel.dict[cpu] for cpu in sys.argv[4:]]
+    parse_isa_desc(sys.argv[2], sys.argv[3])