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macho: fix overflowing u64 range

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This commit is contained in:
Jakub Konka 2021-01-19 19:04:01 +01:00
parent e726868b02
commit 5d4401ceec
1 changed files with 7 additions and 2 deletions
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9
src/link/MachO.zig
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@ -2153,8 +2153,13 @@ fn allocateTextBlock(self: *MachO, text_block: *TextBlock, new_block_size: u64,
// Is it enough that we could fit this new text block?
const sym = self.local_symbols.items[big_block.local_sym_index];
const capacity = big_block.capacity(self.*);
const ideal_capacity = capacity * alloc_num / alloc_den;
const ideal_capacity_end_vaddr = sym.n_value + ideal_capacity;
const ideal_capacity_end_vaddr: u64 = ideal_cap: {
if (math.mul(u64, @divTrunc(capacity, alloc_den), alloc_num)) |cap| {
break :ideal_cap math.add(u64, sym.n_value, cap) catch math.maxInt(u64);
} else |_| {
break :ideal_cap math.maxInt(u64);
}
};
const capacity_end_vaddr = sym.n_value + capacity;
const new_start_vaddr_unaligned = capacity_end_vaddr - new_block_ideal_capacity;
const new_start_vaddr = mem.alignBackwardGeneric(u64, new_start_vaddr_unaligned, alignment);