1 files changed, 66 insertions, 0 deletions
diff --git a/src/asm2wasm-main.cpp b/src/asm2wasm-main.cpp
new file mode 100644
index 000000000..c09a2345b
--- /dev/null
+++ b/src/asm2wasm-main.cpp
@@ -0,0 +1,66 @@
+//
+// asm2wasm console tool
+//
+
+#include "asm2wasm.h"
+
+using namespace cashew;
+using namespace wasm;
+
+int main(int argc, char **argv) {
+  debug = getenv("ASM2WASM_DEBUG") ? getenv("ASM2WASM_DEBUG")[0] - '0' : 0;
+
+  char *infile = argv[1];
+
+  if (debug) std::cerr << "loading '" << infile << "'...\n";
+  FILE *f = fopen(argv[1], "r");
+  assert(f);
+  fseek(f, 0, SEEK_END);
+  int size = ftell(f);
+  char *input = new char[size+1];
+  rewind(f);
+  int num = fread(input, 1, size, f);
+  // On Windows, ftell() gives the byte position (\r\n counts as two bytes), but when
+  // reading, fread() returns the number of characters read (\r\n is read as one char \n, and counted as one),
+  // so return value of fread can be less than size reported by ftell, and that is normal.
+  assert((num > 0 || size == 0) && num <= size);
+  fclose(f);
+  input[num] = 0;
+
+  // emcc --separate-asm modules look like
+  //
+  //    Module["asm"] = (function(global, env, buffer) {
+  //      ..
+  //    });
+  //
+  // we need to clean that up.
+  if (*input == 'M') {
+    while (*input != 'f') {
+      input++;
+      num--;
+    }
+    char *end = input + num - 1;
+    while (*end != '}') {
+      *end = 0;
+      end--;
+    }
+  }
+
+  if (debug) std::cerr << "parsing...\n";
+  cashew::Parser<Ref, DotZeroValueBuilder> builder;
+  Ref asmjs = builder.parseToplevel(input);
+
+  if (debug) std::cerr << "wasming...\n";
+  Module wasm;
+  Asm2WasmBuilder asm2wasm(wasm);
+  asm2wasm.processAsm(asmjs);
+
+  if (debug) std::cerr << "optimizing...\n";
+  asm2wasm.optimize();
+
+  if (debug) std::cerr << "printing...\n";
+  std::cout << wasm;
+
+  if (debug) std::cerr << "done.\n";
+}
+