start on wasm2asm tool

kripken · kripken · commit 0d2c26a55784 · 2015-12-03T17:59:38.000-08:00
diff --git a/build.sh b/build.sh
@@ -2,6 +2,8 @@ echo "building binaryen shell"
 g++ -O2 -std=c++11 src/binaryen-shell.cpp src/pass.cpp src/passes/*.cpp -o bin/binaryen-shell -Isrc/ -msse2 -mfpmath=sse # use sse for math, avoid x87, necessarily for proper float rounding on 32-bit
 echo "building asm2wasm"
 g++ -O2 -std=c++11 src/asm2wasm-main.cpp src/emscripten-optimizer/parser.cpp src/emscripten-optimizer/simple_ast.cpp src/emscripten-optimizer/optimizer-shared.cpp -o bin/asm2wasm
+#echo "building wasm2asm"
+#g++ -O2 -std=c++11 src/wasm2asm-main.cpp src/emscripten-optimizer/parser.cpp src/emscripten-optimizer/simple_ast.cpp src/emscripten-optimizer/optimizer-shared.cpp -o bin/wasm2asm
 echo "building interpreter/js"
 em++ -std=c++11 src/wasm-js.cpp src/emscripten-optimizer/parser.cpp src/emscripten-optimizer/simple_ast.cpp src/emscripten-optimizer/optimizer-shared.cpp -o bin/wasm.js -s MODULARIZE=1 -s 'EXPORT_NAME="WasmJS"' --memory-init-file 0 -Oz -s ALLOW_MEMORY_GROWTH=1 -profiling -s DEMANGLE_SUPPORT=1 #-DWASM_JS_DEBUG -DWASM_INTERPRETER_DEBUG=2
 cat src/js/post.js >> bin/wasm.js
diff --git a/src/wasm2asm-main.cpp b/src/wasm2asm-main.cpp
@@ -0,0 +1,53 @@
+//
+// wasm2asm console tool
+//
+
+#include "wasm2asm.h"
+
+using namespace cashew;
+using namespace wasm;
+
+namespace wasm {
+int debug = 0;
+}
+
+int main(int argc, char **argv) {
+  debug = getenv("WASM2ASM_DEBUG") ? getenv("WASM2ASM_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;
+
+  SExpressionParser parser(input);
+  Element& root = *parser.root;
+  AllocatingModule wasm;
+  SExpressionWasmBuilder builder(wasm, *root[0], [&]() { abort(); });
+
+  if (debug) std::cerr << "parsing...\n";
+  cashew::Parser<Ref, DotZeroValueBuilder> builder;
+  Ref asmjs = builder.parseToplevel(input);
+
+  if (debug) std::cerr << "asming...\n";
+  Wasm2AsmBuilder wasm2asm;
+  Ref asmjs = wasm2asm.processWasm(wasm);
+
+  if (debug) std::cerr << "printing...\n";
+  asmjs->stringify(std::cout);
+  std::cout << '\n';
+
+  if (debug) std::cerr << "done.\n";
+}
+
