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Code Issues Releases Activity

avutil/vulkan_loader: Avoid relocations for strings

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To do so, concatenate all the names together to one big string
name1\0name2\0....lastname\0\0. This avoids the pointer in
the FunctionLoadInfo structure and thereby moves vk_load_info
into .rodata (and makes it smaller by 888B).

Reviewed-by: Lynne <dev@lynne.ee>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2024-03-03 17:02:10 +01:00
parent 674f20813d
commit 0a05577d1e
1 changed files with 12 additions and 4 deletions
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16
libavutil/vulkan_loader.h
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@ -31,7 +31,6 @@
req_dev, \
offsetof(FFVulkanFunctions, name), \
ext_flag, \
"vk"#name, \
},
static inline uint64_t ff_vk_extensions_to_mask(const char * const *extensions,
@ -101,18 +100,26 @@ static inline int ff_vk_load_functions(AVHWDeviceContext *ctx,
char req_dev;
uint16_t struct_offset;
FFVulkanExtensions ext_flag;
const char *name;
} vk_load_info[] = {
FN_LIST(PFN_LOAD_INFO)
#ifdef _WIN32
FN_LIST_WIN32(PFN_LOAD_INFO)
#endif
};
// Concatenate the names to avoid relocations. The resulting string
// will end with \0\0
#define FUNC_NAME(req_inst, req_dev, ext_flag, name) "vk"#name"\0"
const char *name =
FN_LIST(FUNC_NAME)
#ifdef _WIN32
FN_LIST_WIN32(FUNC_NAME)
#endif
;
#undef FUNC_NAME
for (int i = 0; i < FF_ARRAY_ELEMS(vk_load_info); i++) {
for (int i = 0; i < FF_ARRAY_ELEMS(vk_load_info); name += strlen(name) + 1, i++) {
const struct FunctionLoadInfo *load = &vk_load_info[i];
static const char extensions[][4] = { "", "EXT", "KHR" };
const char *name = load->name;
PFN_vkVoidFunction fn;
if (load->req_dev && !has_dev)
@ -146,6 +153,7 @@ static inline int ff_vk_load_functions(AVHWDeviceContext *ctx,
*(PFN_vkVoidFunction *)((uint8_t *)vk + load->struct_offset) = fn;
}
av_assert1(*name == '\0');
return 0;
}