gcc/jit/ChangeLog:
	* docs/cp/topics/contexts.rst (Debugging): Add
	gccjit::context::dump_reproducer_to_file.
	* docs/internals/index.rst (Design notes): New section,
	discussing input validation and
	gcc_jit_context_dump_reproducer_to_file.
	* docs/topics/contexts.rst (Debugging): Add
	gcc_jit_context_dump_reproducer_to_file.
	* docs/_build/texinfo/libgccjit.texi: Regenerate.
	* jit-common.h (gcc::jit::dump::get_context): New accessor.
	* jit-recording.c: Include "hash-map.h".
	Within namespace ::gcc::jit...
	(dump::write): Flush each line.
	(dump::make_location): Pass false for new param "created_by_user".
	(class allocator): New class.
	(allocator::~allocator): New function.
	(allocator::xstrdup_printf): New function.
	(allocator::xstrdup_printf_va): New function.
	(class reproducer): New subclass of dump.
	(reproducer::reproducer): New function.
	(reproducer::write_params): New function.
	(reproducer::write_args): New function.
	(reproducer::make_identifier): New function.
	(reproducer::make_tmp_identifier): New function.
	(reproducer::get_identifier): New pair of functions.
	(reproducer::get_identifier_as_rvalue): New function.
	(reproducer::get_identifier_as_lvalue): New function.
	(reproducer::get_identifier_as_type): New function.
	(reproducer::xstrdup_printf): New function.
	(recording::context::context): Initialize m_toplevel_ctxt.
	(recording::context::new_location): Add param created_by_user.
	(str_option_reproducer_strings): New table of strings.
	(int_option_reproducer_strings): Likewise.
	(bool_option_reproducer_strings): Likewise.
	(get_type_enum_strings): Likewise.
	(names_of_function_kinds): Likewise.
	(global_kind_reproducer_strings): Likewise.
	(unary_op_reproducer_strings): Likewise.
	(binary_op_reproducer_strings): Likewise.
	(comparison_reproducer_strings): Likewise.
	Within namespace ::gcc::jit::recording::...
	(context::dump_reproducer_to_file): New function.
	(string::write_reproducer): Likewise.
	(location::write_reproducer): Likewise.
	(type::access_as_type): Likewise.
	(memento_of_get_type::write_reproducer): Likewise.
	(memento_of_get_pointer::write_reproducer): Likewise.
	(memento_of_get_const::write_reproducer): Likewise.
	(memento_of_get_volatile::write_reproducer): Likewise.
	(array_type::write_reproducer): Likewise.
	(function_type::write_reproducer): Likewise.
	(function_type::write_deferred_reproducer): Likewise.
	(field::write_reproducer): Likewise.
	(struct_::access_as_type): Likewise.
	(struct_::write_reproducer): Likewise.
	(union_::write_reproducer): Likewise.
	(fields::write_reproducer): Likewise.
	(rvalue::access_as_rvalue): Likewise.
	(lvalue::access_as_rvalue): Likewise.
	(lvalue::access_as_lvalue): Likewise.
	(param::access_as_rvalue): Likewise.
	(param::access_as_lvalue): Likewise.
	(param::write_reproducer): Likewise.
	(function::write_reproducer): Likewise.
	(block::write_reproducer): Likewise.
	(global::write_reproducer): Likewise.
	(memento_of_new_rvalue_from_const <int>::write_reproducer):
	Likewise.
	(memento_of_new_rvalue_from_const <long>::write_reproducer):
	Likewise.
	(memento_of_new_rvalue_from_const <double>::write_reproducer):
	Likewise.
	(memento_of_new_rvalue_from_const <void *>::write_reproducer):
	Likewise.
	(memento_of_new_string_literal::write_reproducer): Likewise.
	(unary_op::write_reproducer): Likewise.
	(binary_op::write_reproducer): Likewise.
	(comparison::write_reproducer): Likewise.
	(cast::write_reproducer): Likewise.
	(call::write_reproducer): Likewise.
	(call_through_ptr::write_reproducer): Likewise.
	(array_access::write_reproducer): Likewise.
	(access_field_of_lvalue::write_reproducer): Likewise.
	(access_field_rvalue::write_reproducer): Likewise.
	(dereference_field_rvalue::write_reproducer): Likewise.
	(dereference_rvalue::write_reproducer): Likewise.
	(get_address_of_lvalue::write_reproducer): Likewise.
	(local::write_reproducer): Likewise.
	(eval::write_reproducer): Likewise.
	(assignment::write_reproducer): Likewise.
	(assignment_op::write_reproducer): Likewise.
	(comment::write_reproducer): Likewise.
	(conditional::write_reproducer): Likewise.
	(jump::write_reproducer): Likewise.
	(return_::write_reproducer): Likewise.
	* jit-recording.h (gcc::jit::reproducer): New forward declararion.
	Within namespace ::gcc::jit::recording::...
	(context::new_location): Add "created_by_user" param.
	(context::dump_reproducer_to_file): New method.
	(context::m_toplevel_ctxt): New field.
	(memento::write_reproducer): New pure virtual function.
	(memento::dyn_cast_location): New virtual function.
	(string::write_reproducer):
	(location::location): Add "created_by_user" param.
	(location::dyn_cast_location): New function.
	(location::created_by_user): New accessor.
	(location::write_reproducer): New function.
	(location::m_created_by_user): New field.
	(type::access_as_type): New virtual function.
	(location::write_reproducer): Likewise.
	(type::access_as_type): Likewise.
	(memento_of_get_type::write_reproducer): Likewise.
	(memento_of_get_pointer::write_reproducer): Likewise.
	(memento_of_get_const::write_reproducer): Likewise.
	(memento_of_get_volatile::write_reproducer): Likewise.
	(array_type::write_reproducer): Likewise.
	(function_type::write_reproducer): Likewise.
	(function_type::write_deferred_reproducer): Likewise.
	(field::write_reproducer): Likewise.
	(struct_::access_as_type): Likewise.
	(struct_::write_reproducer): Likewise.
	(union_::write_reproducer): Likewise.
	(union_::m_fields): Remove stray unused field.
	(fields::length): New accessor.
	(fields::get_field): New accessor.
	(fields::write_reproducer): New function.
	(rvalue::access_as_rvalue): Likewise.
	(lvalue::access_as_rvalue): Likewise.
	(lvalue::access_as_lvalue): Likewise.
	(param::access_as_rvalue): Likewise.
	(param::access_as_lvalue): Likewise.
	(param::write_reproducer): Likewise.
	(function::write_reproducer): Likewise.
	(block::write_reproducer): Likewise.
	(global::write_reproducer): Likewise.
	(memento_of_new_rvalue_from_const <HOST_TYPE>::write_reproducer):
	Likewise.
	(memento_of_new_string_literal::write_reproducer): Likewise.
	(unary_op::write_reproducer): Likewise.
	(binary_op::write_reproducer): Likewise.
	(comparison::write_reproducer): Likewise.
	(cast::write_reproducer): Likewise.
	(call::write_reproducer): Likewise.
	(call_through_ptr::write_reproducer): Likewise.
	(array_access::write_reproducer): Likewise.
	(access_field_of_lvalue::write_reproducer): Likewise.
	(access_field_rvalue::write_reproducer): Likewise.
	(dereference_field_rvalue::write_reproducer): Likewise.
	(dereference_rvalue::write_reproducer): Likewise.
	(get_address_of_lvalue::write_reproducer): Likewise.
	(local::write_reproducer): Likewise.
	(eval::write_reproducer): Likewise.
	(assignment::write_reproducer): Likewise.
	(assignment_op::write_reproducer): Likewise.
	(comment::write_reproducer): Likewise.
	(conditional::write_reproducer): Likewise.
	(jump::write_reproducer): Likewise.
	(return_::write_reproducer): Likewise.
	* libgccjit++.h (gccjit::context::dump_reproducer_to_file): New.
	* libgccjit.c (gcc_jit_context_new_location): Pass "true" as
	param "created_by_user".
	(gcc_jit_context_dump_reproducer_to_file): New API entrypoint.
	* libgccjit.h (gcc_jit_context_dump_reproducer_to_file): New API
	entrypoint.
	* libgccjit.map (gcc_jit_context_dump_reproducer_to_file): New API
	entrypoint.

gcc/testsuite/ChangeLog:
	* jit.dg/harness.h (set_up_logging): Move string concatenation
	into...
	(concat_strings): New function.
	(dump_reproducer): New function.
	(test_jit): Call dump_reproducer.
	* jit.dg/jit.exp (is_testcase_meant_to_generate_a_reproducer): New
	function.
	(jit-dg-test): Delete any generated reproducer from previous runs.
	Verify that a generated reproducer was created, and verify that it
	compiles.
	* jit.dg/test-nested-contexts.c (main): Call
	gcc_jit_context_dump_reproducer_to_file.

From-SVN: r219564