asm2wasm debuginfo (#895)

* parse file/line comments in asm.js into debug intrinsics

* convert debug intrinsics into annotations, and print them

* ignore --debuginfo if not emitting text, as wasm binaries don't support that yet

* emit full debug info when -g and emitting text; when -g and emitting binary, all we can do is the Names section

* update wasm.js

1 files changed, 26 insertions, 0 deletions

diff --git a/test/debugInfo.asm.js b/test/debugInfo.asm.js
new file mode 100644
index 000000000..929d79804
--- /dev/null
+++ b/test/debugInfo.asm.js
@@ -0,0 +1,26 @@
+function () {
+  "use asm";
+  function add(x, y) {
+    x = x | 0;
+    y = y | 0;
+    x = x; //@line 5 "tests/hello_world.c"
+    y = y; //@line 6 "tests/hello_world.c"
+    x = y; //@line 314159 "tests/other_file.cpp"
+    return x + y | 0;
+  }
+  function ret(x) {
+    x = x | 0;
+    x = x << 1; //@line 50 "return.cpp"
+    return x + 1 | 0; //@line 100 "return.cpp"
+  }
+  function opts(x, y) {
+    x = x | 0;
+    y = y | 0;
+    x = (x + y) | 0; //@line 1 "even-opted.cpp"
+    y = y >> x; //@line 2 "even-opted.cpp"
+    x = (x | 0) % (y | 0); //@line 3 "even-opted.cpp"
+    return x + y | 0;
+  }
+  return { add: add, ret: ret, opts: opts };
+}
+