Vulkan-Loader/loader/asm_offset.c at main · CodeLinaro/Vulkan-Loader · GitHub

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/*
 * Copyright (c) 2017-2024 The Khronos Group Inc.
 * Copyright (c) 2017-2024 Valve Corporation
 * Copyright (c) 2017-2024 LunarG, Inc.
 * Copyright (c) 2021 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 *
 * 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: Lenny Komow <lenny@lunarg.com>
 * Author: Charles Giessen <charles@lunarg.com>
 */

// This code generates an assembly file which provides offsets to get struct members from assembly code.

// __USE_MINGW_ANSI_STDIO is needed to use the %zu format specifier with mingw-w64.
// Otherwise the compiler will complain about an unknown format specifier.
#if defined(__MINGW32__) && !defined(__USE_MINGW_ANSI_STDIO)
#define__USE_MINGW_ANSI_STDIO 1
#endif

#include<stdio.h>
#include"loader_common.h"
#include"log.h"

#if defined(__GNUC__) || defined(__clang__)
voidproduce_asm_define() {
// GCC and clang make it easy to print easy to regex for values
 __asm__("# VULKAN_LOADER_ERROR_BIT = %c0" : : "i"(VULKAN_LOADER_ERROR_BIT));
 __asm__("# PTR_SIZE = %c0" : : "i"(sizeof(void*)));
 __asm__("# CHAR_PTR_SIZE = %c0" : : "i"(sizeof(char*)));
 __asm__("# FUNCTION_OFFSET_INSTANCE = %c0" : : "i"(offsetof(structloader_instance, phys_dev_ext_disp_functions)));
 __asm__("# PHYS_DEV_OFFSET_INST_DISPATCH = %c0" : : "i"(offsetof(structloader_instance_dispatch_table, phys_dev_ext)));
 __asm__("# PHYS_DEV_OFFSET_PHYS_DEV_TRAMP = %c0" : : "i"(offsetof(structloader_physical_device_tramp, phys_dev)));
 __asm__("# ICD_TERM_OFFSET_PHYS_DEV_TERM = %c0" : : "i"(offsetof(structloader_physical_device_term, this_icd_term)));
 __asm__("# PHYS_DEV_OFFSET_PHYS_DEV_TERM = %c0" : : "i"(offsetof(structloader_physical_device_term, phys_dev)));
 __asm__("# INSTANCE_OFFSET_ICD_TERM = %c0" : : "i"(offsetof(structloader_icd_term, this_instance)));
 __asm__("# DISPATCH_OFFSET_ICD_TERM = %c0" : : "i"(offsetof(structloader_icd_term, phys_dev_ext)));
 __asm__("# EXT_OFFSET_DEVICE_DISPATCH = %c0" : : "i"(offsetof(structloader_dev_dispatch_table, ext_dispatch)));
}
#elif defined(_WIN32)
// MSVC will print the name of the value and the value in hex
// Must disable optimization for this translation unit, otherwise the compiler strips out the variables
staticconstuint32_tPTR_SIZE=sizeof(void*);
staticconstuint32_tCHAR_PTR_SIZE=sizeof(char*);
staticconstuint32_tFUNCTION_OFFSET_INSTANCE= offsetof(structloader_instance, phys_dev_ext_disp_functions);
staticconstuint32_tPHYS_DEV_OFFSET_INST_DISPATCH= offsetof(structloader_instance_dispatch_table, phys_dev_ext);
staticconstuint32_tPHYS_DEV_OFFSET_PHYS_DEV_TRAMP= offsetof(structloader_physical_device_tramp, phys_dev);
staticconstuint32_tICD_TERM_OFFSET_PHYS_DEV_TERM= offsetof(structloader_physical_device_term, this_icd_term);
staticconstuint32_tPHYS_DEV_OFFSET_PHYS_DEV_TERM= offsetof(structloader_physical_device_term, phys_dev);
staticconstuint32_tINSTANCE_OFFSET_ICD_TERM= offsetof(structloader_icd_term, this_instance);
staticconstuint32_tDISPATCH_OFFSET_ICD_TERM= offsetof(structloader_icd_term, phys_dev_ext);
staticconstuint32_tEXT_OFFSET_DEVICE_DISPATCH= offsetof(structloader_dev_dispatch_table, ext_dispatch);
#else
#warning asm_offset.c variable declarations need to be defined for this platform
#endif

#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
#defineSIZE_T_FMT "%-8zu"
#elif defined(__GNUC__) || defined(__clang__)
#defineSIZE_T_FMT "%-8lu"
#else
#warning asm_offset.c SIZE_T_FMT must be defined for this platform
#endif

structValueInfo {
constchar*name;
size_tvalue;
constchar*comment;
};

enumAssembler {
UNKNOWN=0,
MASM=1,
MARMASM=2,
GAS=3,
};

// This file can both be executed to produce gen_defines.asm and contains all the relevant data which
// the parse_asm_values.py script needs to write gen_defines.asm, necessary for cross compilation
intmain(intargc, char**argv) {
enumAssemblerassembler=UNKNOWN;
for (inti=0; i<argc; ++i) {
if (!strcmp(argv[i], "MASM")) {
assembler=MASM;
 } elseif (!strcmp(argv[i], "MARMASM")) {
assembler=MARMASM;
 } elseif (!strcmp(argv[i], "GAS")) {
assembler=GAS;
 }
 }
if (assembler==UNKNOWN) {
return-1;
 }

structValueInfovalues[] = {
// clang-format off
 { .name="VULKAN_LOADER_ERROR_BIT", .value= (size_t) VULKAN_LOADER_ERROR_BIT,
 .comment="The numerical value of the enum value 'VULKAN_LOADER_ERROR_BIT'" },
 { .name="PTR_SIZE", .value=sizeof(void*),
 .comment="The size of a pointer" },
 { .name="CHAR_PTR_SIZE", .value=sizeof(char*),
 .comment="The size of a 'const char *' struct" },
 { .name="FUNCTION_OFFSET_INSTANCE", .value= offsetof(structloader_instance, phys_dev_ext_disp_functions),
 .comment="The offset of 'phys_dev_ext_disp_functions' within a 'loader_instance' struct" },
 { .name="PHYS_DEV_OFFSET_INST_DISPATCH", .value= offsetof(structloader_instance_dispatch_table, phys_dev_ext),
 .comment="The offset of 'phys_dev_ext' within in 'loader_instance_dispatch_table' struct" },
 { .name="PHYS_DEV_OFFSET_PHYS_DEV_TRAMP", .value= offsetof(structloader_physical_device_tramp, phys_dev),
 .comment="The offset of 'phys_dev' within a 'loader_physical_device_tramp' struct" },
 { .name="ICD_TERM_OFFSET_PHYS_DEV_TERM", .value= offsetof(structloader_physical_device_term, this_icd_term),
 .comment="The offset of 'this_icd_term' within a 'loader_physical_device_term' struct" },
 { .name="PHYS_DEV_OFFSET_PHYS_DEV_TERM", .value= offsetof(structloader_physical_device_term, phys_dev),
 .comment="The offset of 'phys_dev' within a 'loader_physical_device_term' struct" },
 { .name="INSTANCE_OFFSET_ICD_TERM", .value= offsetof(structloader_icd_term, this_instance),
 .comment="The offset of 'this_instance' within a 'loader_icd_term' struct" },
 { .name="DISPATCH_OFFSET_ICD_TERM", .value= offsetof(structloader_icd_term, phys_dev_ext),
 .comment="The offset of 'phys_dev_ext' within a 'loader_icd_term' struct" },
 { .name="EXT_OFFSET_DEVICE_DISPATCH", .value= offsetof(structloader_dev_dispatch_table, ext_dispatch),
 .comment="The offset of 'ext_dispatch' within a 'loader_dev_dispatch_table' struct" },
// clang-format on
 };

FILE*file=loader_fopen("gen_defines.asm", "w");
fprintf(file, "\n");
if (assembler==MASM) {
for (size_ti=0; i<sizeof(values) / sizeof(values[0]); ++i) {
fprintf(file, "%-32s equ "SIZE_T_FMT"; %s\n", values[i].name, values[i].value, values[i].comment);
 }
 } elseif (assembler==MARMASM) {
fprintf(file, " AREA loader_structs_details, DATA,READONLY\n");
#if defined(__aarch64__) || defined(_M_ARM64) || defined(_M_ARM64EC)
fprintf(file, "AARCH_64 EQU 1\n");
#else
fprintf(file, "AARCH_64 EQU 0\n");
#endif
for (size_ti=0; i<sizeof(values) / sizeof(values[0]); ++i) {
fprintf(file, "%-32s EQU "SIZE_T_FMT"; %s\n", values[i].name, values[i].value, values[i].comment);
 }
fprintf(file, " END\n");
 } elseif (assembler==GAS) {
#if defined(__x86_64__) || defined(__i386__)
constchar*comment_delimiter="#";
#if defined(__x86_64__)
fprintf(file, ".set X86_64, 1\n");
#endif// defined(__x86_64__)
#elif defined(__aarch64__) || defined(__arm__)
constchar*comment_delimiter="//";
#if defined(__aarch64__)
fprintf(file, ".set AARCH_64, 1\n");
#else
fprintf(file, ".set AARCH_64, 0\n");
#endif
#else
// Default comment delimiter
constchar*comment_delimiter="#";
#endif
for (size_ti=0; i<sizeof(values) / sizeof(values[0]); ++i) {
fprintf(file, ".set %-32s, "SIZE_T_FMT"%s %s\n", values[i].name, values[i].value, comment_delimiter,
values[i].comment);
 }
 }
returnfclose(file);
}