[Strings] Add string.const (#4768)

This is more work than a typical instruction because it also adds a new section:
all the (string.const "foo") strings are put in a new "strings" section in the binary, and
the instructions refer to them by index.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/wasm/wasm-s-parser.cpp b/src/wasm/wasm-s-parser.cpp
index ac15c5e68..cd6c167c0 100644
--- a/src/wasm/wasm-s-parser.cpp
+++ b/src/wasm/wasm-s-parser.cpp
@@ -2953,6 +2953,10 @@ Expression* SExpressionWasmBuilder::makeStringNew(Element& s, StringNewOp op) {
     op, parseExpression(s[i]), parseExpression(s[i + 1]));
 }
 
+Expression* SExpressionWasmBuilder::makeStringConst(Element& s) {
+  return Builder(wasm).makeStringConst(s[1]->str());
+}
+
 // converts an s-expression string representing binary data into an output
 // sequence of raw bytes this appends to data, which may already contain
 // content.