Minor improvements to the wasm-interpreter debug messages (#784)

* Minor improvements to the wasm-interpreter debug messages

1. Indent nested blocks for more readable structure (with numeric labels
to make it even clearer)
2. Print the names of the variables used for NOTE_EVALs
3. Print the values of arguments when entering a function call

* Move Indenter class to wasm-interpreter.cpp

1 files changed, 24 insertions, 0 deletions

diff --git a/src/wasm-interpreter.cpp b/src/wasm-interpreter.cpp
new file mode 100644
index 000000000..e7df785ac
--- /dev/null
+++ b/src/wasm-interpreter.cpp
@@ -0,0 +1,24 @@
+#include "wasm-interpreter.h"
+
+namespace wasm {
+
+#ifdef WASM_INTERPRETER_DEBUG
+int Indenter::indentLevel = 0;
+
+Indenter::Indenter(const char* entry) : entryName(entry) {
+  ++indentLevel;
+}
+Indenter::~Indenter() {
+  print();
+  std::cout << "exit " << entryName << '\n';
+  --indentLevel;
+}
+void Indenter::print() {
+  std::cout << indentLevel << ':';
+  for (int i = 0; i <= indentLevel; ++i) {
+    std::cout << ' ';
+  }
+}
+#endif // WASM_INTERPRETER_DEBUG
+
+} // namespace wasm