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// runtime.cc -- runtime functions called by generated code
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "go-system.h"
#include "gogo.h"
#include "types.h"
#include "expressions.h"
#include "runtime.h"
// The frontend generates calls to various runtime functions. They
// are implemented in libgo/runtime. This is how the runtime
// functions are represented in the frontend. Note that there is
// currently nothing which ensures that the compiler's understanding
// of the runtime function matches the actual implementation in
// libgo/runtime.
// Parameter and result types used by runtime functions.
enum Runtime_function_type
{
// General indicator that value is not used.
RFT_VOID,
// Go untyped bool, C type _Bool.
RFT_BOOL,
// Go type *bool, C type _Bool*.
RFT_BOOLPTR,
// Go type int, C type intgo.
RFT_INT,
// Go type uint, C type uintgo.
RFT_UINT,
// Go type uint8, C type uint8_t.
RFT_UINT8,
// Go type uint16, C type uint16_t.
RFT_UINT16,
// Go type int32, C type int32_t.
RFT_INT32,
// Go type uint32, C type uint32_t.
RFT_UINT32,
// Go type int64, C type int64_t.
RFT_INT64,
// Go type uint64, C type uint64_t.
RFT_UINT64,
// Go type uintptr, C type uintptr_t.
RFT_UINTPTR,
// Go type rune, C type int32_t.
RFT_RUNE,
// Go type float64, C type double.
RFT_FLOAT64,
// Go type complex64, C type __complex float.
RFT_COMPLEX64,
// Go type complex128, C type __complex double.
RFT_COMPLEX128,
// Go type string, C type struct __go_string.
RFT_STRING,
// Go type unsafe.Pointer, C type "void *".
RFT_POINTER,
// Go type []any, C type struct __go_open_array.
RFT_SLICE,
// Go type map[any]any, C type struct __go_map *.
RFT_MAP,
// Go type chan any, C type struct __go_channel *.
RFT_CHAN,
// Go type non-empty interface, C type struct __go_interface.
RFT_IFACE,
// Go type interface{}, C type struct __go_empty_interface.
RFT_EFACE,
// Pointer to Go type descriptor.
RFT_TYPE,
// [2]string.
RFT_ARRAY2STRING,
// [3]string.
RFT_ARRAY3STRING,
// [4]string.
RFT_ARRAY4STRING,
// [5]string.
RFT_ARRAY5STRING,
NUMBER_OF_RUNTIME_FUNCTION_TYPES
};
// The Type structures for the runtime function types.
static Type* runtime_function_types[NUMBER_OF_RUNTIME_FUNCTION_TYPES];
// Get the Type for a Runtime_function_type code.
static Type*
runtime_function_type(Runtime_function_type bft)
{
go_assert(bft < NUMBER_OF_RUNTIME_FUNCTION_TYPES);
Type* any = Type::make_pointer_type(Type::make_void_type());
if (runtime_function_types[bft] == NULL)
{
const Location bloc = Linemap::predeclared_location();
Type* t;
switch (bft)
{
default:
case RFT_VOID:
go_unreachable();
case RFT_BOOL:
t = Type::make_boolean_type();
break;
case RFT_BOOLPTR:
t = Type::make_pointer_type(Type::lookup_bool_type());
break;
case RFT_INT:
t = Type::lookup_integer_type("int");
break;
case RFT_UINT:
t = Type::lookup_integer_type("uint");
break;
case RFT_UINT8:
t = Type::lookup_integer_type("uint8");
break;
case RFT_UINT16:
t = Type::lookup_integer_type("uint16");
break;
case RFT_INT32:
t = Type::lookup_integer_type("int32");
break;
case RFT_UINT32:
t = Type::lookup_integer_type("uint32");
break;
case RFT_INT64:
t = Type::lookup_integer_type("int64");
break;
case RFT_UINT64:
t = Type::lookup_integer_type("uint64");
break;
case RFT_RUNE:
t = Type::lookup_integer_type("int32");
break;
case RFT_UINTPTR:
t = Type::lookup_integer_type("uintptr");
break;
case RFT_FLOAT64:
t = Type::lookup_float_type("float64");
break;
case RFT_COMPLEX64:
t = Type::lookup_complex_type("complex64");
break;
case RFT_COMPLEX128:
t = Type::lookup_complex_type("complex128");
break;
case RFT_STRING:
t = Type::lookup_string_type();
break;
case RFT_POINTER:
t = Type::make_pointer_type(Type::make_void_type());
break;
case RFT_SLICE:
t = Type::make_array_type(any, NULL);
break;
case RFT_MAP:
t = Type::make_map_type(any, any, bloc);
break;
case RFT_CHAN:
t = Type::make_channel_type(true, true, any);
break;
case RFT_IFACE:
{
Typed_identifier_list* methods = new Typed_identifier_list();
Type* mtype = Type::make_function_type(NULL, NULL, NULL, bloc);
methods->push_back(Typed_identifier("x", mtype, bloc));
Interface_type* it = Type::make_interface_type(methods, bloc);
it->finalize_methods();
t = it;
}
break;
case RFT_EFACE:
t = Type::make_empty_interface_type(bloc);
break;
case RFT_TYPE:
t = Type::make_type_descriptor_ptr_type();
break;
case RFT_ARRAY2STRING:
{
Array_type* at =
Type::make_array_type(Type::make_string_type(),
Expression::make_integer_ul(2, NULL,
bloc));
at->set_is_array_incomparable();
t = at;
}
break;
case RFT_ARRAY3STRING:
{
Array_type* at =
Type::make_array_type(Type::make_string_type(),
Expression::make_integer_ul(3, NULL,
bloc));
at->set_is_array_incomparable();
t = at;
}
break;
case RFT_ARRAY4STRING:
{
Array_type* at =
Type::make_array_type(Type::make_string_type(),
Expression::make_integer_ul(4, NULL,
bloc));
at->set_is_array_incomparable();
t = at;
}
break;
case RFT_ARRAY5STRING:
{
Array_type* at =
Type::make_array_type(Type::make_string_type(),
Expression::make_integer_ul(5, NULL,
bloc));
at->set_is_array_incomparable();
t = at;
}
break;
}
runtime_function_types[bft] = t;
}
return runtime_function_types[bft];
}
// Convert an expression to the type to pass to a runtime function.
static Expression*
convert_to_runtime_function_type(Gogo* gogo, Runtime_function_type bft,
Expression* e, Location loc)
{
switch (bft)
{
default:
case RFT_VOID:
go_unreachable();
case RFT_BOOL:
case RFT_BOOLPTR:
case RFT_INT:
case RFT_UINT:
case RFT_UINT8:
case RFT_UINT16:
case RFT_INT32:
case RFT_UINT32:
case RFT_INT64:
case RFT_UINT64:
case RFT_UINTPTR:
case RFT_RUNE:
case RFT_FLOAT64:
case RFT_COMPLEX64:
case RFT_COMPLEX128:
case RFT_STRING:
case RFT_POINTER:
{
Type* t = runtime_function_type(bft);
Type_context context(t, false);
e->determine_type(gogo, &context);
if (!Type::are_identical(t, e->type(), true, NULL))
e = Expression::make_cast(t, e, loc);
return e;
}
case RFT_SLICE:
case RFT_MAP:
case RFT_CHAN:
case RFT_IFACE:
case RFT_EFACE:
case RFT_ARRAY2STRING:
case RFT_ARRAY3STRING:
case RFT_ARRAY4STRING:
case RFT_ARRAY5STRING:
return Expression::make_unsafe_cast(runtime_function_type(bft), e, loc);
case RFT_TYPE:
go_assert(e->type() == Type::make_type_descriptor_ptr_type());
return e;
}
}
// Convert all the types used for runtime functions to the backend
// representation.
void
Runtime::convert_types(Gogo* gogo)
{
for (int i = 0; i < static_cast<int>(NUMBER_OF_RUNTIME_FUNCTION_TYPES); ++i)
{
Type* t = runtime_function_types[i];
if (t != NULL && t->named_type() != NULL)
{
bool r = t->verify(gogo);
go_assert(r);
t->named_type()->convert(gogo);
}
}
}
// The type used to define a runtime function.
struct Runtime_function
{
// Function name.
const char* name;
// Parameter types. Never more than 6, as it happens. RFT_VOID if
// not used.
Runtime_function_type parameter_types[6];
// Result types. Never more than 2, as it happens. RFT_VOID if not
// used.
Runtime_function_type result_types[2];
};
static const Runtime_function runtime_functions[] =
{
#define DEF_GO_RUNTIME(CODE, NAME, PARAMS, RESULTS) { NAME, PARAMS, RESULTS } ,
#include "runtime.def"
#undef DEF_GO_RUNTIME
};
static Named_object*
runtime_function_declarations[Runtime::NUMBER_OF_FUNCTIONS];
// Get the declaration of a runtime function.
Named_object*
Runtime::runtime_declaration(Function code)
{
go_assert(code < Runtime::NUMBER_OF_FUNCTIONS);
if (runtime_function_declarations[code] == NULL)
{
const Runtime_function* pb = &runtime_functions[code];
Location bloc = Linemap::predeclared_location();
Typed_identifier_list* param_types = NULL;
if (pb->parameter_types[0] != RFT_VOID)
{
param_types = new Typed_identifier_list();
for (unsigned int i = 0;
i < (sizeof(pb->parameter_types)
/ sizeof (pb->parameter_types[0]));
i++)
{
if (pb->parameter_types[i] == RFT_VOID)
break;
Type* t = runtime_function_type(pb->parameter_types[i]);
param_types->push_back(Typed_identifier("", t, bloc));
}
}
Typed_identifier_list* result_types = NULL;
if (pb->result_types[0] != RFT_VOID)
{
result_types = new Typed_identifier_list();
for (unsigned int i = 0;
i < sizeof(pb->result_types) / sizeof(pb->result_types[0]);
i++)
{
if (pb->result_types[i] == RFT_VOID)
break;
Type* t = runtime_function_type(pb->result_types[i]);
result_types->push_back(Typed_identifier("", t, bloc));
}
}
Function_type* fntype = Type::make_function_type(NULL, param_types,
result_types, bloc);
const char* n = pb->name;
const char* n1 = strchr(n, '.');
if (n1 != NULL)
n = n1 + 1;
Named_object* no = Named_object::make_function_declaration(n, NULL,
fntype, bloc);
no->func_declaration_value()->set_asm_name(pb->name);
runtime_function_declarations[code] = no;
}
return runtime_function_declarations[code];
}
// Make a call to a runtime function.
Call_expression*
Runtime::make_call(Gogo* gogo, Runtime::Function code, Location loc,
int param_count, ...)
{
go_assert(code < Runtime::NUMBER_OF_FUNCTIONS);
const Runtime_function* pb = &runtime_functions[code];
go_assert(static_cast<size_t>(param_count)
<= sizeof(pb->parameter_types) / sizeof(pb->parameter_types[0]));
Named_object* no = runtime_declaration(code);
Expression* func = Expression::make_func_reference(no, NULL, loc);
Expression_list* args = new Expression_list();
args->reserve(param_count);
va_list ap;
va_start(ap, param_count);
for (int i = 0; i < param_count; ++i)
{
Expression* e = va_arg(ap, Expression*);
Runtime_function_type rft = pb->parameter_types[i];
args->push_back(convert_to_runtime_function_type(gogo, rft, e, loc));
}
va_end(ap);
return Expression::make_call(func, args, false, loc);
}
// Get the runtime code for a named builtin function. This is used as a helper
// when creating function references for call expressions. Every reference to
// a builtin runtime function should have the associated runtime code. If the
// name is ambiguous and can refer to many runtime codes, return
// NUMBER_OF_FUNCTIONS.
Runtime::Function
Runtime::name_to_code(const std::string& name)
{
Function code = Runtime::NUMBER_OF_FUNCTIONS;
// Look through the known names for a match.
for (size_t i = 0; i < Runtime::NUMBER_OF_FUNCTIONS; i++)
{
const char* runtime_function_name = runtime_functions[i].name;
if (strcmp(runtime_function_name, name.c_str()) == 0)
code = static_cast<Runtime::Function>(i);
// The names in the table have "runtime." prefix. We may be
// called with a name without the prefix. Try matching
// without the prefix as well.
if (strncmp(runtime_function_name, "runtime.", 8) == 0
&& strcmp(runtime_function_name + 8, name.c_str()) == 0)
code = static_cast<Runtime::Function>(i);
}
return code;
}