dwarf: function with multiple ranges (#17)

foo is split into foo and foo.cold, and thus has multiple symbols
and multiple address ranges.

dwarf/cold.cpp

@@ -0,0 +1,40 @@
+/* Based on gcc/gcc/testsuite/gcc.dg/tree-prof/cold_partition_label.c */
+/* foo is split into foo and foo.cold. bar is inlined in both cases.  */
+
+#define MAXITER 10000
+#define SIZE 10000
+
+const char *sarr[SIZE];
+const char *buf_hot;
+const char *buf_cold;
+
+struct Foo
+{
+  int a;
+  void foo(int path);
+  void bar(const char *s);
+};
+
+void Foo::bar(const char *s) {
+  int i;
+  for (i = 0; i < SIZE; i++)
+    sarr[i] = s;
+}
+
+__attribute__((noinline))
+void Foo::foo(int path) {
+  if (path)
+    bar(buf_hot);
+  else
+    bar(buf_cold);
+}
+
+int main(int argc, char *argv[]) {
+  Foo foo = {};
+  int i;
+  buf_hot =  "hello";
+  buf_cold = "world";
+  for (i = 0; i < MAXITER; i++)
+    foo.foo(argc);
+  return 0;
+}

dwarf/cold.sh

@@ -0,0 +1,4 @@
+CFLAGS="-fdebug-prefix-map=`pwd`=/object/testfiles/dwarf -O3"
+g++-13 $CFLAGS cold.cpp -o cold -fprofile-generate
+./cold
+g++-13 $CFLAGS cold.cpp -o cold -fprofile-use -g