Add notes for Pretty Printers.

notes/README.prettyprinter

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+Pretty Printer is a GDB feature to print the contents of structures in
+a pleasant way.
+
+Printing the value of a std::string may look like:
+
+    {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x7fffffffd330 "Hello, World!"}, _M_string_length = 13, {_M_local_buf = "Hello, World!\\000\\000", _M_allocated_capacity = 6278066737626506568}}
+
+Printing the value with Pretty Pretty:
+
+    "Hello, World!"
+
+Enable Pretty Printers via the ~/.gdbinit file.
+
+    % cat ~/.gdbinit
+    python
+    import sys
+    sys.path.insert(0, '/usr/share/gcc-9/python')
+    from libstdcxx.v6.printers import register_libstdcxx_printers
+    register_libstdcxx_printers (None)
+    end
+    %
+

tests/helloasm/README.asm

@@ -1,7 +1,20 @@
 
 Steps to compile an asm program.
 
-% nasm -f elf -F stabs helloasm.asm -o helloasm_stabs.o
-% ld -m elf_i386 helloasm_stabs.o -o helloasm_stabs
-% seer -s helloasm_stabs
+    % nasm -f elf -F stabs helloasm.asm -o helloasm_stabs.o
+    % ld -m elf_i386 helloasm_stabs.o -o helloasm_stabs
+    % seer -s helloasm_stabs
+
+Find address to set start breakpoint.
+
+    % objdump -f helloasm_stabs
+
+    helloasm_stabs:     file format elf32-i386
+    architecture: i386, flags 0x00000112:
+    EXEC_P, HAS_SYMS, D_PAGED
+    start address 0x08048080
+
+Add a way to provide the breakpoint address/function in the
+debug dialog and start command line.
+
 

tests/hellolocals/.gitignore

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+hellolocals

tests/hellolocals/Makefile

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+# This is the default target, which will be built when
+# you invoke make
+.PHONY: all
+all: hellolocals
+
+# This rule tells make how to build hellolocals from hellolocals.cpp
+hellolocals: hellolocals.cpp
+	g++ -g -o hellolocals hellolocals.cpp
+
+# This rule tells make to delete hellolocals and hellolocals.o
+.PHONY: clean
+clean:
+	rm -f hellolocals hellolocals.o
+

tests/hellolocals/README

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+Simple program to show some structures in the "locals" tab of Seer.
+
+See: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34589
+

tests/hellolocals/hellolocals.cpp

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+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+int main(void) {
+
+    size_t idx = 0;
+
+    vector<int> v{1, 2, 3, 4, 5};
+
+    auto& vr = v;
+
+    for (auto i : v) {
+        idx++;
+        cout << i << "=" << v[i] << endl;
+    }
+
+    return 0;
+}
+