[Strings] Add string.new* instructions (#4761)

This is the first instruction from the Strings proposal.

This includes everything but interpreter support.

1 files changed, 10 insertions, 1 deletions

diff --git a/src/wasm-binary.h b/src/wasm-binary.h
index 3b3fa30f6..a5c6d0a46 100644
--- a/src/wasm-binary.h
+++ b/src/wasm-binary.h
@@ -1135,6 +1135,8 @@ enum ASTNodes {
   BrOnNonFunc = 0x63,
   BrOnNonData = 0x64,
   BrOnNonI31 = 0x65,
+  StringNewWTF8 = 0x80,
+  StringNewWTF16 = 0x81,
 };
 
 enum MemoryAccess {
@@ -1145,6 +1147,12 @@ enum MemoryAccess {
 
 enum MemoryFlags { HasMaximum = 1 << 0, IsShared = 1 << 1, Is64 = 1 << 2 };
 
+enum StringNewPolicy {
+  UTF8 = 0x00,
+  WTF8 = 0x01,
+  Replace = 0x02,
+};
+
 enum FeaturePrefix {
   FeatureUsed = '+',
   FeatureRequired = '=',
@@ -1700,6 +1708,7 @@ public:
   bool maybeVisitArraySet(Expression*& out, uint32_t code);
   bool maybeVisitArrayLen(Expression*& out, uint32_t code);
   bool maybeVisitArrayCopy(Expression*& out, uint32_t code);
+  bool maybeVisitStringNew(Expression*& out, uint32_t code);
   void visitSelect(Select* curr, uint8_t code);
   void visitReturn(Return* curr);
   void visitMemorySize(MemorySize* curr);
@@ -1721,7 +1730,7 @@ public:
   // Let is lowered into a block.
   void visitLet(Block* curr);
 
-  void throwError(std::string text);
+  [[noreturn]] void throwError(std::string text);
 
   // Struct/Array instructions have an unnecessary heap type that is just for
   // validation (except for the case of unreachability, but that's not a problem