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dynlib: unload library before loading again & add LIBRARY_FILE_EXTENSION constant

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This commit is contained in:
Laytan Laats
2024-11-28 21:08:08 +01:00
parent 276928170c
commit 1cece52359
5 changed files with 39 additions and 21 deletions
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core/dynlib/lib.odin
+26 -16
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@@ -12,6 +12,11 @@ A handle to a dynamically loaded library.
*/
Library :: distinct rawptr
/*
The file extension for dynamic libraries on the target OS.
*/
LIBRARY_FILE_EXTENSION :: _LIBRARY_FILE_EXTENSION
/*
Loads a dynamic library from the filesystem. The paramater `global_symbols` makes the symbols in the loaded
library available to resolve references in subsequently loaded libraries.
@@ -123,31 +128,36 @@ initialize_symbols :: proc(
) -> (count: int = -1, ok: bool = false) where intrinsics.type_is_struct(T) {
assert(symbol_table != nil)
handle := load_library(library_path) or_return
// First, (re)load the library.
handle: Library
for field in reflect.struct_fields_zipped(T) {
if field.name == handle_field_name {
field_ptr := rawptr(uintptr(symbol_table) + field.offset)
// We appear to be hot reloading. Unload previous incarnation of the library.
if old_handle := (^Library)(field_ptr)^; old_handle != nil {
unload_library(old_handle) or_return
}
handle = load_library(library_path) or_return
(^Library)(field_ptr)^ = handle
break
}
}
// Buffer to concatenate the prefix + symbol name.
prefixed_symbol_buf: [2048]u8 = ---
count = 0
for field in reflect.struct_fields_zipped(T) {
// If we're not the library handle, the field needs to be a pointer type, be it a procedure pointer or an exported global.
if field.name == handle_field_name || !(reflect.is_procedure(field.type) || reflect.is_pointer(field.type)) {
continue
}
// Calculate address of struct member
field_ptr := rawptr(uintptr(symbol_table) + field.offset)
// If we've come across the struct member for the handle, store it and continue scanning for other symbols.
if field.name == handle_field_name {
// We appear to be hot reloading. Unload previous incarnation of the library.
if old_handle := (^Library)(field_ptr)^; old_handle != nil {
unload_library(old_handle) or_return
}
(^Library)(field_ptr)^ = handle
continue
}
// We're not the library handle, so the field needs to be a pointer type, be it a procedure pointer or an exported global.
if !(reflect.is_procedure(field.type) || reflect.is_pointer(field.type)) {
continue
}
// Let's look up or construct the symbol name to find in the library
prefixed_name: string