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#!/usr/bin/python3 -i
#
# Copyright (c) 2022 The Khronos Group Inc.
# Copyright (c) 2022 LunarG, Inc.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Author: Charles Giessen <charles@lunarg.com>
# This script reads in the 'intermediate output' of a compiler to look for sizeof/offsetof information
# necessary for the assembler portions of the loader. This is achieved by forcing the compiler to output
# the intermediate assembly output and looking for specific patterns which contain the relevant information
import sys
import os.path
from os.path import exists
import re
# Where to write the "gen_defines.asm" file
destination_file = sys.argv[1]
# The location the build system puts the intermediate asm file which depends on the compiler
source_asm_file = sys.argv[2]
# Whether we are using "MASM" or "GAS" for the assembler
assembler_type = sys.argv[3]
# Whether we are using gcc, clang, or msvc
compiler = sys.argv[4]
# taken from CMAKE_SYSTEM_PROCESSOR - x86_64 or aarch64
arch = sys.argv[5]
if destination_file is None or source_asm_file is None or assembler_type is None or compiler is None or arch is None:
print("Required command line arguments were not provided")
sys.exit(1)
defines = ["VULKAN_LOADER_ERROR_BIT",
"PTR_SIZE",
"CHAR_PTR_SIZE",
"FUNCTION_OFFSET_INSTANCE",
"PHYS_DEV_OFFSET_INST_DISPATCH",
"PHYS_DEV_OFFSET_PHYS_DEV_TRAMP",
"ICD_TERM_OFFSET_PHYS_DEV_TERM",
"PHYS_DEV_OFFSET_PHYS_DEV_TERM",
"INSTANCE_OFFSET_ICD_TERM",
"DISPATCH_OFFSET_ICD_TERM",
"EXT_OFFSET_DEVICE_DISPATCH" ]
try:
with open(source_asm_file, 'r') as f:
asm_intermediate_file = f.read()
except IOError:
print("Could not open assembler file:", source_asm_file)
sys.exit(1)
with open(destination_file, "w", encoding="utf-8") as dest:
if assembler_type == "MASM":
# special case vulkan error bit due to it not appearing in the asm - its defined in the header as 8 so it shouldn't change
dest.write("VULKAN_LOADER_ERROR_BIT equ 8;\n")
elif assembler_type == "GAS":
# let the assembler know which platform to use
if arch == "x86_64":
dest.write(".set X86_64, 1\n")
elif arch == "aarch64":
dest.write(".set AARCH_64, 1\n")
for d in defines:
match = None
if compiler == "MSVC":
if d == "VULKAN_LOADER_ERROR_BIT":
continue # skip due to special case
match = re.search(d + " DD [ ]*([0-9a-f]+)H", asm_intermediate_file)
elif compiler == "Clang" or compiler == "GNU":
match = re.search(d + " = ([0-9]+)", asm_intermediate_file)
if match:
if compiler == "MSVC":
value = str(int(match.group(1), 16))
elif compiler == "Clang" or compiler == "GNU":
value = match.group(1)
if assembler_type == "MASM":
# MASM uses hex values, decode them here
dest.write(d + " equ " + value +";\n")
elif assembler_type == "GAS":
dest.write(".set " + d + ", " + value + "\n")
else:
print("Couldn't find ", d)
sys.exit(1)
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