Exporting/importing debug location information from .wast/.asm.js/.s formats (#1017)

* Extends wasm-as, wasm-dis and s2wasm to consume debug locations.

* Exports source map from asm2wasm

1 files changed, 16 insertions, 0 deletions

diff --git a/src/tools/wasm-dis.cpp b/src/tools/wasm-dis.cpp
index 93c286913..e6fd7badd 100644
--- a/src/tools/wasm-dis.cpp
+++ b/src/tools/wasm-dis.cpp
@@ -28,6 +28,7 @@ using namespace cashew;
 using namespace wasm;
 
 int main(int argc, const char *argv[]) {
+  std::string sourceMapFilename;
   Options options("wasm-dis", "Un-assemble a .wasm (WebAssembly binary format) into a .wast (WebAssembly text format)");
   options.add("--output", "-o", "Output file (stdout if not specified)",
               Options::Arguments::One,
@@ -35,6 +36,9 @@ int main(int argc, const char *argv[]) {
                 o->extra["output"] = argument;
                 Colors::disable();
               })
+      .add("--source-map", "-sm", "Consume source map from the specified file to add location information",
+           Options::Arguments::One,
+           [&sourceMapFilename](Options *o, const std::string &argument) { sourceMapFilename = argument; })
       .add_positional("INFILE", Options::Arguments::One,
                       [](Options *o, const std::string &argument) {
                         o->extra["infile"] = argument;
@@ -46,11 +50,23 @@ int main(int argc, const char *argv[]) {
   if (options.debug) std::cerr << "parsing binary..." << std::endl;
   Module wasm;
   try {
+    std::unique_ptr<std::ifstream> sourceMapStream;
     WasmBinaryBuilder parser(wasm, input, options.debug);
+    if (sourceMapFilename.size()) {
+        sourceMapStream = make_unique<std::ifstream>();
+        sourceMapStream->open(sourceMapFilename);
+        parser.setDebugLocations(sourceMapStream.get());
+    }
     parser.read();
+    if (sourceMapStream) {
+        sourceMapStream->close();
+    }
   } catch (ParseException& p) {
     p.dump(std::cerr);
     Fatal() << "error in parsing wasm binary";
+  } catch (MapParseException& p) {
+    p.dump(std::cerr);
+    Fatal() << "error in parsing wasm source mapping";
   }
 
   if (options.debug) std::cerr << "Printing..." << std::endl;