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# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
# vim: set filetype=python:
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distibuted with this
import itertools
# The wasm2c source relies on CMAKE to generate a config file to be used to build the project
# Since we do not use cmake, this script automates the generation of a similar config suitable
# for firefox builds
# The script has a list of known variables it can replace and throws an error if it encounters a
# new variable (for instance when the in-tree source is updated)
# This python script knows how to replace the following variables normally configured by cmake for
# the wasm2c source
known_vars = [
'#cmakedefine WABT_VERSION_STRING "@WABT_VERSION_STRING@"',
"#cmakedefine WABT_DEBUG @WABT_DEBUG@",
"#cmakedefine01 HAVE_ALLOCA_H",
"#cmakedefine01 HAVE_UNISTD_H",
"#cmakedefine01 HAVE_SNPRINTF",
"#cmakedefine01 HAVE_SSIZE_T",
"#cmakedefine01 HAVE_STRCASECMP",
"#cmakedefine01 HAVE_WIN32_VT100",
"#cmakedefine01 WABT_BIG_ENDIAN",
"#cmakedefine01 HAVE_OPENSSL_SHA_H",
"#cmakedefine01 COMPILER_IS_CLANG",
"#cmakedefine01 COMPILER_IS_GNU",
"#cmakedefine01 COMPILER_IS_MSVC",
"#cmakedefine01 WITH_EXCEPTIONS",
"#define SIZEOF_SIZE_T @SIZEOF_SIZE_T@",
]
# The above variables are replaced with the code shown below
replaced_variables = """
// mozilla-config.h defines the following which is used
// - HAVE_ALLOCA_H
// - HAVE_UNISTD_H
#include "mozilla-config.h"
#define WABT_VERSION_STRING "Firefox-in-tree-version"
#define WABT_DEBUG 0
/* We don't require color printing of wasm2c errors on any platform */
#define HAVE_WIN32_VT100 0
#ifdef _WIN32
// Ignore whatever is set in mozilla-config.h wrt alloca because it is
// wrong when cross-compiling on Windows.
#undef HAVE_ALLOCA_H
// It is wrong when cross-compiling on Windows.
#undef HAVE_UNISTD_H
/* Whether ssize_t is defined by stddef.h */
#define HAVE_SSIZE_T 0
/* Whether strcasecmp is defined by strings.h */
#define HAVE_STRCASECMP 0
#else
#define HAVE_SSIZE_T 1
#define HAVE_STRCASECMP 1
#endif
#if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__)
# if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
# define WABT_BIG_ENDIAN 0
# elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
# define WABT_BIG_ENDIAN 1
# else
# error "Can't handle mixed-endian architectures"
# endif
#else
# error "Don't know how to determine endianness"
#endif
/* Use internal Pico-SHA. Never use OpenSSL */
#define HAVE_OPENSSL_SHA_H 0
/* Whether snprintf is defined by stdio.h */
#define HAVE_SNPRINTF 1
#if defined(_MSC_VER)
#define COMPILER_IS_GNU 0
#define COMPILER_IS_CLANG 0
#define COMPILER_IS_MSVC 1
#elif defined(__GNUC__)
#if defined(__clang__)
#define COMPILER_IS_GNU 0
#define COMPILER_IS_CLANG 1
#define COMPILER_IS_MSVC 0
#else
#define COMPILER_IS_GNU 1
#define COMPILER_IS_CLANG 0
#define COMPILER_IS_MSVC 0
#endif
#else
#error "Unknown compiler"
#endif
#define WITH_EXCEPTIONS 0
#if SIZE_MAX == 0xffffffffffffffff
#define SIZEOF_SIZE_T 8
#elif SIZE_MAX == 0xffffffff
#define SIZEOF_SIZE_T 4
#else
#error "Unknown size of size_t"
#endif
"""
def generate_config(output, config_h_in):
file_config_h_in = open(config_h_in, "r")
lines = file_config_h_in.readlines()
# Remove the known cmake variables
for known_var in known_vars:
lines = [x for x in lines if not x.startswith(known_var)]
# Do a sanity check to make sure there are no unknown variables
remaining_vars = [x for x in lines if x.startswith("#cmakedefine") or "@" in x]
if len(remaining_vars) > 0:
raise BaseException("Unknown cmake variables: " + str(remaining_vars))
pos = lines.index("#define WABT_CONFIG_H_\n")
skipped = itertools.takewhile(
lambda x: not (x.strip()) or x.startswith("#include "), lines[pos + 1 :]
)
pos += len(list(skipped))
pre_include_lines = lines[0:pos]
post_include_lines = lines[pos:]
output_str = (
"".join(pre_include_lines)
+ "\n"
+ replaced_variables
+ "\n"
+ "".join(post_include_lines)
)
output.write(output_str)