Function LookUpMapping

Source/ThirdParty/tracy/client/TracyProfiler.cpp:209–222

Internal implementation helper for LookUpMapping(address). Takes as input an `address` and a known vector `mappings`, assumed to be sorted by increasing addresses, as /proc/self/maps seems to be. Returns a pointer to the MappingInfo describing the mapping that this address belongs to, or nullptr if the address isn't in `mappings`.

// Returns a pointer to the MappingInfo describing the mapping that this
// address belongs to, or nullptr if the address isn't in `mappings`.
static MappingInfo* LookUpMapping(std::vector<MappingInfo>& mappings, uintptr_t address)
{
    // Comparison function for std::lower_bound. Returns true if all addresses in `m1`
    // are lower than `addr`.
    auto Compare = []( const MappingInfo& m1, uintptr_t addr ) {
        // '<=' because the address ranges are half-open intervals, [start, end).
        return m1.end_address <= addr;
    };
    auto iter = std::lower_bound( mappings.begin(), mappings.end(), address, Compare );
    if( iter == mappings.end() || iter->start_address > address) {
        return nullptr;
    }
    return &*iter;
}

// Internal implementation helper for EnsureReadable(address).
//