DxcBlob::as_slice violates slice::from_raw_parts precondition when IDxcBlob::get_buffer_pointer returns null #85
Description
It is not allowed to pass a null pointer to slice::from_raw_parts. An empty blob can be obtained by compiling successfully without warnings, then calling get_error_buffer (useful for obtaining compiler warnings) on the Ok result of DxcCompiler::compile:
let result = dxc_compiler.compile(
&source_blob,
source_path.as_ref(),
entry_point,
target_profile,
&args,
Some(&mut IncludeHandler),
/* defines */ &[],
);
match result {
Ok(ok) => {
let err = ok.get_error_buffer()?;
// thread 'main' panicked at library/core/src/panicking.rs:218:5:
// unsafe precondition(s) violated: slice::from_raw_parts requires the pointer to be aligned and non-null, and the total size of the slice not to exceed `isize::MAX`
//
// This indicates a bug in the program. This Undefined Behavior check is optional, and cannot be relied on for safety.
let err = dxc_library.get_blob_as_string(&err.into())?;
println!("cargo::warning={err}");
Ok(())
},
Err(err) => {
let err = err.0.get_error_buffer()?;
let err = dxc_library.get_blob_as_string(&err.into())?;
Err(HassleError::CompileError(err).into())
},
}