analyzer: eliminate region_model::impl_call_* special cases

Eliminate all of the remaining special cases in class region_model that
handle various specific functions, replacing them with uses of
known_function subclasses.

Add various type-checks that ought to prevent ICEs for cases where
functions match the name of a standard C library or POSIX function, but
have incompatible arguments.

gcc/analyzer/ChangeLog:
	* analyzer.h (class internal_known_function): New.
	(register_varargs_builtins): New decl.
	* engine.cc (exploded_node::on_stmt_pre): Remove
	"out_terminate_path" param from call to region_model::on_stmt_pre.
	(feasibility_state::maybe_update_for_edge): Likewise.
	* known-function-manager.cc: Include "basic-block.h", "gimple.h",
	and "analyzer/region-model.h".
	(known_function_manager::known_function_manager): Initialize
	m_combined_fns_arr.
	(known_function_manager::~known_function_manager): Clean up
	m_combined_fns_arr.
	(known_function_manager::get_by_identifier): Make const.
	(known_function_manager::add): New overloaded definitions for
	enum built_in_function and enum internal_fn.
	(known_function_manager::get_by_fndecl): Delete.
	(known_function_manager::get_match): New.
	(known_function_manager::get_internal_fn): New.
	(known_function_manager::get_normal_builtin): New.
	* known-function-manager.h
	(known_function_manager::get_by_identifier): Make private and
	add const qualifier.
	(known_function_manager::get_by_fndecl): Delete.
	(known_function_manager::add): Add overloaded decls for
	enum built_in_function name and enum internal_fn.
	(known_function_manager::get_match): New decl.
	(known_function_manager::get_internal_fn): New decl.
	(known_function_manager::get_normal_builtin): New decl.
	(known_function_manager::m_combined_fns_arr): New field.
	* region-model-impl-calls.cc (call_details::arg_is_size_p): New.
	(class kf_alloca): New.
	(region_model::impl_call_alloca): Convert to...
	(kf_alloca::impl_call_pre): ...this.
	(kf_analyzer_dump_capacity::matches_call_types_p): Rewrite check
	to use call_details::arg_is_pointer_p.
	(region_model::impl_call_builtin_expect): Convert to...
	(class kf_expect): ...this.
	(class kf_calloc): New, adding check that both arguments are
	size_t.
	(region_model::impl_call_calloc): Convert to...
	(kf_calloc::impl_call_pre): ...this.
	(kf_connect::matches_call_types_p): Rewrite check to use
	call_details::arg_is_pointer_p.
	(region_model::impl_call_error): Convert to...
	(class kf_error): ...this, and...
	(kf_error::impl_call_pre): ...this.
	(class kf_fgets): New, adding checks that args 0 and 2 are
	pointers.
	(region_model::impl_call_fgets): Convert to...
	(kf_fgets::impl_call_pre): ...this.
	(class kf_fread): New, adding checks on the argument types.
	(region_model::impl_call_fread): Convert to...
	(kf_fread::impl_call_pre): ...this.
	(class kf_free): New, adding check that the argument is a pointer.
	(region_model::impl_call_free): Convert to...
	(kf_free::impl_call_post): ...this.
	(class kf_getchar): New.
	(class kf_malloc): New, adding check that the argument is a
	size_t.
	(region_model::impl_call_malloc): Convert to...
	(kf_malloc::impl_call_pre): ...this.
	(class kf_memcpy): New, adding checks on arguments.
	(region_model::impl_call_memcpy): Convert to...
	(kf_memcpy::impl_call_pre): ...this.
	(class kf_memset): New.
	(region_model::impl_call_memset): Convert to...
	(kf_memset::impl_call_pre): ...this.
	(kf_pipe::matches_call_types_p): Rewrite check to use
	call_details::arg_is_pointer_p.
	(kf_putenv::matches_call_types_p): Likewise.
	(class kf_realloc): New, adding checks on the argument types.
	(region_model::impl_call_realloc): Convert to...
	(kf_realloc::impl_call_post): ...this.
	(class kf_strchr): New.
	(region_model::impl_call_strchr): Convert to...
	(kf_strchr::impl_call_post): ...this.
	(class kf_stack_restore): New.
	(class kf_stack_save): New.
	(class kf_stdio_output_fn): New.
	(class kf_strcpy): New,
	(region_model::impl_call_strcpy): Convert to...
	(kf_strcpy::impl_call_pre): ...this.
	(class kf_strlen): New.
	(region_model::impl_call_strlen): Convert to...
	(kf_strlen::impl_call_pre): ...this.
	(class kf_ubsan_bounds): New.
	(region_model::impl_deallocation_call): Reimplement to avoid call
	to impl_call_free.
	(register_known_functions): Add handlers for IFN_BUILTIN_EXPECT
	and IFN_UBSAN_BOUNDS.  Add handlers for BUILT_IN_ALLOCA,
	BUILT_IN_ALLOCA_WITH_ALIGN, BUILT_IN_CALLOC, BUILT_IN_EXPECT,
	BUILT_IN_EXPECT_WITH_PROBABILITY, BUILT_IN_FPRINTF,
	BUILT_IN_FPRINTF_UNLOCKED, BUILT_IN_FPUTC,
	BUILT_IN_FPUTC_UNLOCKED, BUILT_IN_FPUTS, BUILT_IN_FPUTS_UNLOCKED,
	BUILT_IN_FREE, BUILT_IN_FWRITE, BUILT_IN_FWRITE_UNLOCKED,
	BUILT_IN_MALLOC, BUILT_IN_MEMCPY, BUILT_IN_MEMCPY_CHK,
	BUILT_IN_MEMSET, BUILT_IN_MEMSET_CHK, BUILT_IN_PRINTF,
	BUILT_IN_PRINTF_UNLOCKED, BUILT_IN_PUTC, BUILT_IN_PUTCHAR,
	BUILT_IN_PUTCHAR_UNLOCKED, BUILT_IN_PUTC_UNLOCKED, BUILT_IN_PUTS,
	BUILT_IN_PUTS_UNLOCKED, BUILT_IN_REALLOC, BUILT_IN_STACK_RESTORE,
	BUILT_IN_STACK_SAVE, BUILT_IN_STRCHR, BUILT_IN_STRCPY,
	BUILT_IN_STRCPY_CHK, BUILT_IN_STRLEN, BUILT_IN_VFPRINTF, and
	BUILT_IN_VPRINTF. Call register_varargs_builtins.  Add handlers
	for "getchar", "memset", "fgets", "fgets_unlocked", "fread",
	"error", and "error_at_line".
	* region-model.cc (region_model::on_stmt_pre): Drop
	"out_terminate_path" param.
	(region_model::get_known_function): Reimplement by calling
	known_function_manager::get_match, passing new "cd" param.
	Add overload taking enum internal_fn.
	(region_model::on_call_pre): Drop "out_terminate_path" param.
	Remove special-case handling of internal fns IFN_BUILTIN_EXPECT,
	IFN_UBSAN_BOUNDS, and IFN_VA_ARG, of built-in fns BUILT_IN_ALLOCA,
	BUILT_IN_ALLOCA_WITH_ALIGN, BUILT_IN_CALLOC, BUILT_IN_EXPECT,
	BUILT_IN_EXPECT_WITH_PROBABILITY, BUILT_IN_FREE, BUILT_IN_MALLOC,
	BUILT_IN_MEMCPY, BUILT_IN_MEMCPY_CHK, BUILT_IN_MEMSET,
	BUILT_IN_MEMSET_CHK, BUILT_IN_REALLOC, BUILT_IN_STRCHR,
	BUILT_IN_STRCPY, BUILT_IN_STRCPY_CHK, BUILT_IN_STRLEN,
	BUILT_IN_STACK_SAVE, BUILT_IN_STACK_RESTORE, BUILT_IN_FPRINTF,
	BUILT_IN_FPRINTF_UNLOCKED, BUILT_IN_PUTC, BUILT_IN_PUTC_UNLOCKED,
	BUILT_IN_FPUTC, BUILT_IN_FPUTC_UNLOCKED, BUILT_IN_FPUTS,
	BUILT_IN_FPUTS_UNLOCKED, BUILT_IN_FWRITE,
	BUILT_IN_FWRITE_UNLOCKED, BUILT_IN_PRINTF,
	BUILT_IN_PRINTF_UNLOCKED, BUILT_IN_PUTCHAR,
	BUILT_IN_PUTCHAR_UNLOCKED, BUILT_IN_PUTS, BUILT_IN_PUTS_UNLOCKED,
	BUILT_IN_VFPRINTF, BUILT_IN_VPRINTF, BUILT_IN_VA_START, and
	BUILT_IN_VA_COPY, and of named functions "malloc", "calloc",
	"alloca", "realloc", "error", "error_at_line", "fgets",
	"fgets_unlocked", "fread", "getchar", "memset", "strchr", and
	"strlen".  Replace all this special-casing with calls to
	get_known_function for internal fns and for fn decls.
	(region_model::on_call_post): Remove special-casing handling for
	"free" and "strchr", and for BUILT_IN_REALLOC, BUILT_IN_STRCHR,
	and BUILT_IN_VA_END.  Replace by consolidating on usage of
	get_known_function.
	* region-model.h (call_details::arg_is_size_p): New.
	(region_model::on_stmt_pre): Drop "out_terminate_path" param.
	(region_model::on_call_pre): Likewise.
	(region_model::impl_call_alloca): Delete.
	(region_model::impl_call_builtin_expect): Delete.
	(region_model::impl_call_calloc): Delete.
	(region_model::impl_call_error): Delete.
	(region_model::impl_call_fgets): Delete.
	(region_model::impl_call_fread): Delete.
	(region_model::impl_call_free): Delete.
	(region_model::impl_call_malloc): Delete.
	(region_model::impl_call_memcpy): Delete.
	(region_model::impl_call_memset): Delete.
	(region_model::impl_call_realloc): Delete.
	(region_model::impl_call_strchr): Delete.
	(region_model::impl_call_strcpy): Delete.
	(region_model::impl_call_strlen): Delete.
	(region_model::impl_call_va_start): Delete.
	(region_model::impl_call_va_copy): Delete.
	(region_model::impl_call_va_arg): Delete.
	(region_model::impl_call_va_end): Delete.
	(region_model::check_region_for_write): Public.
	(region_model::get_known_function): Add "cd" param.  Add
	overloaded decl taking enum internal_fn.
	* sm-malloc.cc: Update comments.
	* varargs.cc (class kf_va_start): New.
	(region_model::impl_call_va_start): Convert to...
	(kf_va_start::impl_call_pre): ...this.
	(class kf_va_copy): New.
	(region_model::impl_call_va_copy): Convert to...
	(kf_va_copy::impl_call_pre): ...this.
	(class kf_va_arg): New.
	(region_model::impl_call_va_arg): Convert to...
	(kf_va_arg::impl_call_pre): ...this.
	(class kf_va_end): New.
	(region_model::impl_call_va_end): Delete.
	(register_varargs_builtins): New.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>

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