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Kernel: Remove Range "valid" state and use Optional<Range> instead

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It's easier to understand VM ranges if they are always valid. We can
simply use an empty Optional<Range> to encode absence when needed.
This commit is contained in:
Andreas Kling 2021-01-27 21:01:45 +01:00
parent 67bc5e0bbd
commit e67402c702
8 changed files with 39 additions and 37 deletions
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13
Kernel/Syscalls/mmap.cpp
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@ -134,17 +134,18 @@ void* Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> user_params)
Region* region = nullptr;
auto range = allocate_range(VirtualAddress(addr), size, alignment);
if (!range.is_valid()) {
if (!range.has_value()) {
if (addr && !map_fixed) {
// If there's an address but MAP_FIXED wasn't specified, the address is just a hint.
range = allocate_range({}, size, alignment);
}
return (void*)-ENOMEM;
if (!range.has_value())
return (void*)-ENOMEM;
}
if (map_anonymous) {
auto strategy = map_noreserve ? AllocationStrategy::None : AllocationStrategy::Reserve;
auto region_or_error = allocate_region(range, !name.is_null() ? name : "mmap", prot, strategy);
auto region_or_error = allocate_region(range.value(), !name.is_null() ? name : "mmap", prot, strategy);
if (region_or_error.is_error())
return (void*)region_or_error.error().error();
region = region_or_error.value();
@ -170,7 +171,7 @@ void* Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> user_params)
return (void*)-EACCES;
}
auto region_or_error = description->mmap(*this, range, static_cast<size_t>(offset), prot, map_shared);
auto region_or_error = description->mmap(*this, range.value(), static_cast<size_t>(offset), prot, map_shared);
if (region_or_error.is_error())
return (void*)region_or_error.error().error();
region = region_or_error.value();
@ -447,10 +448,10 @@ void* Process::sys$allocate_tls(size_t size)
ASSERT(main_thread);
auto range = allocate_range({}, size);
if (!range.is_valid())
if (!range.has_value())
return (void*)-ENOMEM;
auto region_or_error = allocate_region(range, String(), PROT_READ | PROT_WRITE);
auto region_or_error = allocate_region(range.value(), String(), PROT_READ | PROT_WRITE);
if (region_or_error.is_error())
return (void*)region_or_error.error().error();