2020-06-02 10:29:24 +01:00
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package wrapper
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2020-06-03 02:03:38 +01:00
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// #include <stdlib.h>
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import "C"
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import (
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"fmt"
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"unsafe"
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lib "github.com/sugarme/gotch/libtch"
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)
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// ptrToString returns nil on the null pointer. If not null,
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// the pointer gets freed.
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// NOTE: C does not have exception design. C++ throws exception
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// to stderr. This code to check stderr for any err message,
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// if it exists, takes it and frees up C pointer.
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func ptrToString(cptr *C.char) string {
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var str string
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str = *(*string)(unsafe.Pointer(&cptr))
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fmt.Printf("Err Msg from C: %v\n", str)
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if str != "" {
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// Free up C memory
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C.free(unsafe.Pointer(cptr))
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return str
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} else {
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return ""
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}
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}
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// TorchErr checks and retrieves last error message from
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// C `thread_local` if existing and frees up C memory the C pointer
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// points to.
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//
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// NOTE: Go language atm does not have generic function something
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// similar to `macro` in Rust language, does it? So we have to
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// wrap this function to any Libtorch C function call to check error
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// instead of doing the other way around.
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// See Go2 proposal: https://github.com/golang/go/issues/32620
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func TorchErr() error {
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cptr := (*C.char)(lib.GetAndResetLastErr())
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errStr := ptrToString(cptr)
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if errStr != "" {
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return fmt.Errorf("Libtorch API Err: %v\n", errStr)
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}
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return nil
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}
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