src/dawn/node/NapiSymbols.cpp

// Copyright 2021 The Dawn & Tint Authors
//
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//    this list of conditions and the following disclaimer in the documentation
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#include "src/dawn/node/utils/Debug.h"

// To reduce the build dependencies for compiling the dawn.node targets, we do
// not use cmake-js for building, but instead just depend on node_api_headers.
// As the name suggests, node_api_headers contains just the *headers* of Napi,
// and does not provide a library to link against.
// Fortunately node_api_headers provides a list of Napi symbols exported by Node,
// which we can use to produce weak-symbol stubs.

#ifdef _WIN32
#error "NapiSymbols.cpp is not used on Windows"
#endif

#ifdef __clang__
// TODO(crbug.com/404499678): GN build doesn't like when weak functions have a definition
#ifdef NAPI_SYMBOL_WEAK_DECL_ONLY
#define NAPI_SYMBOL(NAME) __attribute__((weak)) void NAME();
#else
#define NAPI_SYMBOL(NAME)                                                    \
    __attribute__((weak)) void NAME() {                                      \
        UNREACHABLE(#NAME                                                    \
                    " is a weak stub, and should have been runtime replaced" \
                    " by the node implementation");                          \
    }
#endif
#else
#define NAPI_SYMBOL(NAME)
#endif

extern "C" {
// List of Napi symbols generated from the node_api_headers/symbols.js file
#include "NapiSymbols.h"
}