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Wrap intrinsics.overflow_add to safe_add

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gingerBill
2022-10-15 12:52:07 +01:00
parent 7662808bc9
commit ff51c5ee56
3 changed files with 10 additions and 48 deletions
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core/mem/virtual/virtual.odin
+9 -2
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@@ -136,13 +136,13 @@ alloc_from_memory_block :: proc(block: ^Memory_Block, min_size, alignment: uint)
}
alignment_offset := calc_alignment_offset(block, uintptr(alignment))
size, size_ok := intrinsics.overflow_add(min_size, alignment_offset)
size, size_ok := safe_add(min_size, alignment_offset)
if !size_ok {
err = .Out_Of_Memory
return
}
if to_be_used, ok := intrinsics.overflow_add(block.used, size); !ok || to_be_used > block.reserved {
if to_be_used, ok := safe_add(block.used, size); !ok || to_be_used > block.reserved {
err = .Out_Of_Memory
return
}
@@ -166,3 +166,10 @@ memory_block_dealloc :: proc(block_to_free: ^Memory_Block) {
}
}
@(private)
safe_add :: #force_inline proc "contextless" (x, y: uint) -> (uint, bool) {
z, did_overflow := intrinsics.overflow_add(x, y)
return z, !did_overflow
}