Add support for multi-value proposal (#861)

Use the `--enable-multi-value` flag to enable.

A lot of code already "worked" with multi-value, and just needed to
remove the restrictions. Most of the other changes are modifying the
callback APIs to be more general, e.g. taking more than 1 result type.

* Types are now stored as the negative values; this works nicely with
  the encoding of inline function types (used for block signatures),
  which are always positive values.
* Remove `BlockSignature` and use `BlockDeclaration` instead, which
  is just a typedef to `FuncSignature`. This allows for explicit or
  implicit type specifications on the block signatures.
* Allow for >1 "keep" values in the DropKeep interpreter instruction

1 files changed, 26 insertions, 20 deletions

diff --git a/src/binary-reader-logging.cc b/src/binary-reader-logging.cc
index b1896c73..f730a865 100644
--- a/src/binary-reader-logging.cc
+++ b/src/binary-reader-logging.cc
@@ -76,10 +76,18 @@ void BinaryReaderLogging::WriteIndent() {
   }
 }
 
+void BinaryReaderLogging::LogType(Type type) {
+  if (IsTypeIndex(type)) {
+    LOGF_NOINDENT("funcidx[%d]", static_cast<int>(type));
+  } else {
+    LOGF_NOINDENT("%s", GetTypeName(type));
+  }
+}
+
 void BinaryReaderLogging::LogTypes(Index type_count, Type* types) {
   LOGF_NOINDENT("[");
   for (Index i = 0; i < type_count; ++i) {
-    LOGF_NOINDENT("%s", GetTypeName(types[i]));
+    LogType(types[i]);
     if (i != type_count - 1) {
       LOGF_NOINDENT(", ");
     }
@@ -254,11 +262,11 @@ Result BinaryReaderLogging::OnLocalDecl(Index decl_index,
   return reader_->OnLocalDecl(decl_index, count, type);
 }
 
-Result BinaryReaderLogging::OnBlockExpr(Index num_types, Type* sig_types) {
+Result BinaryReaderLogging::OnBlockExpr(Type sig_type) {
   LOGF("OnBlockExpr(sig: ");
-  LogTypes(num_types, sig_types);
+  LogType(sig_type);
   LOGF_NOINDENT(")\n");
-  return reader_->OnBlockExpr(num_types, sig_types);
+  return reader_->OnBlockExpr(sig_type);
 }
 
 Result BinaryReaderLogging::OnBrExpr(Index depth) {
@@ -323,34 +331,32 @@ Result BinaryReaderLogging::OnI64ConstExpr(uint64_t value) {
   return reader_->OnI64ConstExpr(value);
 }
 
-Result BinaryReaderLogging::OnIfExpr(Index num_types, Type* sig_types) {
+Result BinaryReaderLogging::OnIfExpr(Type sig_type) {
   LOGF("OnIfExpr(sig: ");
-  LogTypes(num_types, sig_types);
+  LogType(sig_type);
   LOGF_NOINDENT(")\n");
-  return reader_->OnIfExpr(num_types, sig_types);
+  return reader_->OnIfExpr(sig_type);
 }
 
-Result BinaryReaderLogging::OnIfExceptExpr(Index num_types,
-                                           Type* sig_types,
-                                           Index except_index) {
+Result BinaryReaderLogging::OnIfExceptExpr(Type sig_type, Index except_index) {
   LOGF("OnIfExceptExpr(sig: ");
-  LogTypes(num_types, sig_types);
+  LogType(sig_type);
   LOGF_NOINDENT(", except: %" PRIindex ")\n", except_index);
-  return reader_->OnIfExceptExpr(num_types, sig_types, except_index);
+  return reader_->OnIfExceptExpr(sig_type, except_index);
 }
 
-Result BinaryReaderLogging::OnLoopExpr(Index num_types, Type* sig_types) {
+Result BinaryReaderLogging::OnLoopExpr(Type sig_type) {
   LOGF("OnLoopExpr(sig: ");
-  LogTypes(num_types, sig_types);
+  LogType(sig_type);
   LOGF_NOINDENT(")\n");
-  return reader_->OnLoopExpr(num_types, sig_types);
+  return reader_->OnLoopExpr(sig_type);
 }
 
-Result BinaryReaderLogging::OnTryExpr(Index num_types, Type* sig_types) {
+Result BinaryReaderLogging::OnTryExpr(Type sig_type) {
   LOGF("OnTryExpr(sig: ");
-  LogTypes(num_types, sig_types);
+  LogType(sig_type);
   LOGF_NOINDENT(")\n");
-  return reader_->OnTryExpr(num_types, sig_types);
+  return reader_->OnTryExpr(sig_type);
 }
 
 Result BinaryReaderLogging::OnSimdLaneOpExpr(Opcode opcode, uint64_t value) {
@@ -753,8 +759,8 @@ Result BinaryReaderLogging::OnOpcodeV128(v128 value) {
   return reader_->OnOpcodeV128(value);
 }
 
-Result BinaryReaderLogging::OnOpcodeBlockSig(Index num_types, Type* sig_types) {
-  return reader_->OnOpcodeBlockSig(num_types, sig_types);
+Result BinaryReaderLogging::OnOpcodeBlockSig(Type sig_type) {
+  return reader_->OnOpcodeBlockSig(sig_type);
 }
 
 Result BinaryReaderLogging::OnEndFunc() {