[REFACTOR][FFI][Web] Upgrade Web Runtime to new FFI (apache#17946)

This PR refactors the web runtime to the new FFI protocol.
Tested through RPC tests and local tests.

Author: tqchen

include/tvm/ffi/c_api.h

@@ -579,8 +579,10 @@ TVM_FFI_DLL int TVMFFIDataTypeFromString(const TVMFFIByteArray* str, DLDataType*
  * \return 0 when success, nonzero when failure happens
  * \note out is a String object that needs to be freed by the caller via TVMFFIObjectFree.
          The content of string can be accessed via TVMFFIObjectGetByteArrayPtr.
+
+ * \note The input dtype is a pointer to the DLDataType to avoid ABI compatibility issues.
  */
-TVM_FFI_DLL int TVMFFIDataTypeToString(DLDataType dtype, TVMFFIObjectHandle* out);
+TVM_FFI_DLL int TVMFFIDataTypeToString(const DLDataType* dtype, TVMFFIObjectHandle* out);
 
 //------------------------------------------------------------
 // Section: Backend noexcept functions for internal use

include/tvm/ffi/dtype.h

@@ -121,7 +121,7 @@ inline DLDataType StringToDLDataType(const String& str) {
 
 inline String DLDataTypeToString(DLDataType dtype) {
   TVMFFIObjectHandle out;
-  TVM_FFI_CHECK_SAFE_CALL(TVMFFIDataTypeToString(dtype, &out));
+  TVM_FFI_CHECK_SAFE_CALL(TVMFFIDataTypeToString(&dtype, &out));
   return String(details::ObjectUnsafe::ObjectPtrFromOwned<Object>(static_cast<TVMFFIObject*>(out)));
 }
 

include/tvm/ffi/error.h

@@ -51,6 +51,10 @@
 #define TVM_FFI_BACKTRACE_ON_SEGFAULT 1
 #endif
 
+#ifndef TVM_FFI_ALWAYS_LOG_BEFORE_THROW
+#define TVM_FFI_ALWAYS_LOG_BEFORE_THROW 0
+#endif
+
 namespace tvm {
 namespace ffi {
 
@@ -212,8 +216,10 @@ class ErrorBuilder {
  *
  * \endcode
  */
-#define TVM_FFI_THROW(ErrorKind) \
-  ::tvm::ffi::details::ErrorBuilder(#ErrorKind, TVM_FFI_TRACEBACK_HERE, false).stream()
+#define TVM_FFI_THROW(ErrorKind)                                        \
+  ::tvm::ffi::details::ErrorBuilder(#ErrorKind, TVM_FFI_TRACEBACK_HERE, \
+                                    TVM_FFI_ALWAYS_LOG_BEFORE_THROW)    \
+      .stream()
 
 /*!
  * \brief Explicitly log error in stderr and then throw the error.

src/ffi/dtype.cc

@@ -320,9 +320,9 @@ int TVMFFIDataTypeFromString(const TVMFFIByteArray* str, DLDataType* out) {
   TVM_FFI_SAFE_CALL_END();
 }
 
-int TVMFFIDataTypeToString(DLDataType dtype, TVMFFIObjectHandle* out) {
+int TVMFFIDataTypeToString(const DLDataType* dtype, TVMFFIObjectHandle* out) {
   TVM_FFI_SAFE_CALL_BEGIN();
-  tvm::ffi::String out_str(tvm::ffi::DLDataTypeToString_(dtype));
+  tvm::ffi::String out_str(tvm::ffi::DLDataTypeToString_(*dtype));
   *out = tvm::ffi::details::ObjectUnsafe::MoveObjectRefToTVMFFIObjectPtr(std::move(out_str));
   TVM_FFI_SAFE_CALL_END();
 }