Merge pull request #12 from javierhonduco/cpp-improve-test-binary

cpp: Add more comprehensive example

cpp/Makefile

@@ -1,11 +1,21 @@
 .PHONY: build
-build: pie no-pie with-clang
+build: pie pie-with-fp no-pie no-pie-with-fp clang clang-with-fp
 
 pie:
 	docker build -t parca-demo:cpp-pie --build-arg GCC_FLAGS='-g' .
 
+pie-with-fp:
+	docker build -t parca-demo:cpp-pie-with-fp --build-arg GCC_FLAGS='-g -fno-omit-frame-pointer' .
+
+
 no-pie:
 	docker build -t parca-demo:cpp --build-arg GCC_FLAGS='-g -no-pie' .
 
-with-clang:
+no-pie-with-fp:
+	docker build -t parca-demo:cpp-with-fp --build-arg GCC_FLAGS='-g -no-pie -fno-omit-frame-pointer' .
+
+clang:
 	docker build -f Dockerfile.clang -t parca-demo:cpp-clang --build-arg CLANG_FLAGS='-g' .
+
+clang-with-fp:
+	docker build -f Dockerfile.clang -t parca-demo:cpp-clang-with-fp --build-arg CLANG_FLAGS='-g -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer' .

cpp/main.cpp

@@ -1,27 +1,37 @@
+#include <fcntl.h>
 #include <iostream>
+#include <unistd.h>
 
-unsigned int fibonacci(unsigned int n)
-{
-    if (n == 0)
-        return 0;
 
-    unsigned int a = 1, b = 1;
-    for (unsigned int i = 3; i <= n; ++i)
-    {
-        unsigned int fib = a + b;
-        a = b;
-        b = fib;
-    }
+int __attribute__((noinline)) top() {
+  for (int i = 0; i < 100000; i++) {
+    int fd = open("/", O_DIRECTORY);
+    close(fd);
+  }
 
-    return b;
+  return 0;
 }
 
-int main()
-{
-    int limit = 1000000;
-    for (int i = 0; i < limit; i++)
-    {
-        std::cout << "F(" << i << ") = " << fibonacci(i) << std::endl;
-    }
-    return 0;
+// ones
+int __attribute__((noinline)) c1() { return top(); }
+
+int __attribute__((noinline)) b1() { return c1(); }
+
+int __attribute__((noinline)) a1() { return b1(); }
+
+// twos
+int __attribute__((noinline)) c2() { return top(); }
+
+int __attribute__((noinline)) b2() { return c2(); }
+
+int __attribute__((noinline)) a2() { return b2(); }
+
+int main() {
+  while (true) {
+    std::cout << "Calling a1" << std::endl;
+    a1();
+    std::cout << "Calling a2" << std::endl;
+    a2();
+  }
+  return 0;
 }