wasm-reduce tool (#1139)

Reduce an interesting wasm to a smaller still interesting wasm. This takes an arbitrary command to run, and reduces the wasm as much as it can while keeping the behavior of that command fixed. This can be used to reduce compiler bugs in an arbitrary VM, etc.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/support/file.cpp b/src/support/file.cpp
index c1d9e6e33..bd6f2d4bd 100644
--- a/src/support/file.cpp
+++ b/src/support/file.cpp
@@ -73,3 +73,15 @@ wasm::Output::Output(const std::string &filename, Flags::BinaryOption binary, Fl
         }
         return buffer;
       }()) {}
+
+void wasm::copy_file(std::string input, std::string output) {
+  std::ifstream src(input, std::ios::binary);
+  std::ofstream dst(output, std::ios::binary);
+  dst << src.rdbuf();
+}
+
+size_t wasm::file_size(std::string filename) {
+  std::ifstream infile(filename, std::ifstream::ate | std::ifstream::binary);
+  return infile.tellg();
+}
+