Add missing GC.@preserves. (#2487)

Author: maleadt

lib/cudadrv/devices.jl

@@ -68,7 +68,7 @@ function name(dev::CuDevice)
     buf = Vector{Cchar}(undef, buflen)
     cuDeviceGetName(pointer(buf), buflen, dev)
     buf[end] = 0
-    return unsafe_string(pointer(buf))
+    return GC.@preserve buf unsafe_string(pointer(buf))
 end
 
 """

lib/cudadrv/module.jl

@@ -66,7 +66,7 @@ mutable struct CuModule
                                                  ERROR_INVALID_IMAGE,
                                                  ERROR_INVALID_PTX)
                 options = decode(optionKeys, optionVals)
-                error(unsafe_string(pointer(options[JIT_ERROR_LOG_BUFFER])))
+                error(GC.@preserve options unsafe_string(pointer(options[JIT_ERROR_LOG_BUFFER])))
             else
                 rethrow()
             end

lib/nvml/device.jl

@@ -55,7 +55,7 @@ Base.IteratorSize(::DeviceIterator) = Base.HasLength()
 function name(dev::Device)
     buf = Vector{Cchar}(undef, NVML_DEVICE_NAME_V2_BUFFER_SIZE)
     nvmlDeviceGetName(dev, pointer(buf), length(buf))
-    return unsafe_string(pointer(buf))
+    return GC.@preserve buf unsafe_string(pointer(buf))
 end
 
 function brand(dev::Device)
@@ -67,15 +67,15 @@ end
 function uuid(dev::Device)
     buf = Vector{Cchar}(undef, NVML_DEVICE_UUID_V2_BUFFER_SIZE)
     nvmlDeviceGetUUID(dev, pointer(buf), length(buf))
-    uuid_str = unsafe_string(pointer(buf))
+    uuid_str = GC.@preserve buf unsafe_string(pointer(buf))
     @assert startswith(uuid_str, "GPU-") || startswith(uuid_str, "MIG-")
     return Base.UUID(uuid_str[5:end])
 end
 
 function serial(dev::Device)
     buf = Vector{Cchar}(undef, NVML_DEVICE_SERIAL_BUFFER_SIZE)
     nvmlDeviceGetSerial(dev, pointer(buf), length(buf))
-    return unsafe_string(pointer(buf))
+    return GC.@preserve buf unsafe_string(pointer(buf))
 end
 
 function index(dev::Device)

lib/nvml/system.jl

@@ -4,15 +4,15 @@ function version()
 
     # the version string is too long for Julia to handle, e.g. 11.450.36.06,
     # so split off the driver part into the build suffix
-    ver = unsafe_string(pointer(buf))
+    ver = GC.@preserve buf unsafe_string(pointer(buf))
     parts = parse.(Int, split(ver, '.'))
     return VersionNumber(parts[1], 0, 0, (), Tuple(parts[2:end]))
 end
 
 function driver_version()
     buf = Vector{Cchar}(undef, NVML_SYSTEM_DRIVER_VERSION_BUFFER_SIZE)
     nvmlSystemGetDriverVersion(pointer(buf), length(buf))
-    return VersionNumber(unsafe_string(pointer(buf)))
+    return GC.@preserve buf VersionNumber(unsafe_string(pointer(buf)))
 end
 
 function cuda_driver_version()