add BinaryenExpressionPrint to c api (#599)

2 files changed, 9 insertions, 1 deletions

diff --git a/src/binaryen-c.cpp b/src/binaryen-c.cpp
index 5ae3b7a10..4dff289fb 100644
--- a/src/binaryen-c.cpp
+++ b/src/binaryen-c.cpp
@@ -364,6 +364,11 @@ BinaryenExpressionRef BinaryenUnreachable(BinaryenModuleRef module) {
   return static_cast<Expression*>(((Module*)module)->allocator.alloc<Unreachable>());
 }
 
+void BinaryenExpressionPrint(BinaryenExpressionRef expr) {
+  WasmPrinter::printExpression((Expression*)expr, std::cout);
+  std::cout << '\n';
+}
+
 // Functions
 
 BinaryenFunctionRef BinaryenAddFunction(BinaryenModuleRef module, const char* name, BinaryenFunctionTypeRef type, BinaryenType* localTypes, BinaryenIndex numLocalTypes, BinaryenExpressionRef body) {
diff --git a/src/binaryen-c.h b/src/binaryen-c.h
index b9343012c..a587e03ac 100644
--- a/src/binaryen-c.h
+++ b/src/binaryen-c.h
@@ -288,6 +288,9 @@ BinaryenExpressionRef BinaryenHost(BinaryenModuleRef module, BinaryenOp op, cons
 BinaryenExpressionRef BinaryenNop(BinaryenModuleRef module);
 BinaryenExpressionRef BinaryenUnreachable(BinaryenModuleRef module);
 
+// Print an expression to stdout. Useful for debugging.
+void BinaryenExpressionPrint(BinaryenExpressionRef expr);
+
 // Functions
 
 typedef void* BinaryenFunctionRef;
@@ -324,7 +327,7 @@ void BinaryenSetStart(BinaryenModuleRef module, BinaryenFunctionRef start);
 // ========== Module Operations ==========
 //
 
-// Print a module to stdout.
+// Print a module to stdout. Useful for debugging.
 void BinaryenModulePrint(BinaryenModuleRef module);
 
 // Validate a module, showing errors on problems.