test/example/c-api-hello-world.c

#include <binaryen-c.h>

// "hello world" type example: create a function that adds two i32s and returns
// the result

int main() {
  BinaryenModuleRef module = BinaryenModuleCreate();

  // Create a function type for  i32 (i32, i32)
  BinaryenType ii[2] = {BinaryenTypeInt32(), BinaryenTypeInt32()};
  BinaryenType params = BinaryenTypeCreate(ii, 2);
  BinaryenType results = BinaryenTypeInt32();

  // Get the 0 and 1 arguments, and add them
  BinaryenExpressionRef x = BinaryenLocalGet(module, 0, BinaryenTypeInt32()),
                        y = BinaryenLocalGet(module, 1, BinaryenTypeInt32());
  BinaryenExpressionRef add = BinaryenBinary(module, BinaryenAddInt32(), x, y);

  // Create the add function
  // Note: no additional local variables
  // Note: no basic blocks here, we are an AST. The function body is just an
  // expression node.
  BinaryenFunctionRef adder =
    BinaryenAddFunction(module, "adder", params, results, NULL, 0, add);

  // Print it out
  BinaryenModulePrint(module);

  // Clean up the module, which owns all the objects we created above
  BinaryenModuleDispose(module);

  return 0;
}