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dtype.d
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dtype.d
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/**
* Compiler implementation of the
* $(LINK2 http://www.dlang.org, D programming language).
*
* Copyright: Copyright (C) 1985-1998 by Symantec
* Copyright (C) 2000-2021 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 http://www.digitalmars.com, Walter Bright)
* License: $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: https://github.com/dlang/dmd/blob/master/src/dmd/backend/dtype.d
*/
module dmd.backend.dtype;
version (SCPP)
{
version = COMPILE;
version = SCPP_HTOD;
}
version (HTOD)
{
version = COMPILE;
version = SCPP_HTOD;
}
version (MARS)
version = COMPILE;
version (COMPILE)
{
import core.stdc.stdio;
import core.stdc.stdlib;
import core.stdc.string;
import dmd.backend.cdef;
import dmd.backend.cc;
import dmd.backend.dlist;
import dmd.backend.el;
import dmd.backend.global;
import dmd.backend.mem;
import dmd.backend.oper;
import dmd.backend.ty;
import dmd.backend.type;
version (SCPP_HTOD)
{
import dtoken;
import msgs2;
import parser;
import precomp;
}
extern (C++):
nothrow:
@safe:
alias MEM_PH_MALLOC = mem_malloc;
alias MEM_PH_CALLOC = mem_calloc;
alias MEM_PH_FREE = mem_free;
alias MEM_PH_STRDUP = mem_strdup;
alias MEM_PARF_MALLOC = mem_malloc;
alias MEM_PARF_CALLOC = mem_calloc;
alias MEM_PARF_REALLOC = mem_realloc;
alias MEM_PARF_FREE = mem_free;
alias MEM_PARF_STRDUP = mem_strdup;
version (SCPP_HTOD)
@trusted
struct_t* struct_calloc();
else
@trusted
struct_t* struct_calloc() { return cast(struct_t*) mem_calloc(struct_t.sizeof); }
int REGSIZE();
private __gshared
{
type *type_list; // free list of types
param_t *param_list; // free list of params
int type_num,type_max; /* gather statistics on # of types */
}
__gshared
{
type*[TYMAX] tstypes;
type*[TYMAX] tsptr2types;
type* tstrace,tsclib,tsjlib,tsdlib,
tslogical;
type* tspvoid,tspcvoid;
type* tsptrdiff, tssize;
}
/*******************************
* Compute size of type in bytes.
* Mark size as known after error message if it is not known.
* Instantiate templates as needed to compute size.
* Params:
* t = type
* Returns:
* size
*/
version (SCPP_HTOD)
{
@trusted
targ_size_t type_size(type* t)
{
switch (tybasic(t.Tty))
{
case TYarray:
if (t.Tflags & TFsizeunknown)
{
synerr(EM_unknown_size,"array".ptr); /* size of array is unknown */
t.Tflags &= ~TFsizeunknown;
}
type_size(t.Tnext);
break;
case TYstruct:
auto ts = t.Ttag.Stype; // find main instance
// (for const struct X)
if (ts.Tflags & TFsizeunknown)
{
template_instantiate_forward(ts.Ttag);
if (ts.Tflags & TFsizeunknown)
synerr(EM_unknown_size,ts.Tty & TYstruct ? prettyident(ts.Ttag) : "struct");
ts.Tflags &= ~TFsizeunknown;
}
break;
case TYenum:
if (t.Ttag.Senum.SEflags & SENforward)
synerr(EM_unknown_size, prettyident(t.Ttag));
type_size(t.Tnext);
break;
default:
break;
}
return type_size(cast(const)t);
}
}
/***********************
* Compute size of type in bytes.
* Params:
* t = type
* Returns:
* size
*/
@trusted
targ_size_t type_size(const type *t)
{ targ_size_t s;
tym_t tyb;
type_debug(t);
tyb = tybasic(t.Tty);
debug if (tyb >= TYMAX)
/*type_print(t),*/
printf("tyb = x%x\n", tyb);
assert(tyb < TYMAX);
s = _tysize[tyb];
if (s == cast(targ_size_t) -1)
{
switch (tyb)
{
// in case program plays games with function pointers
case TYffunc:
case TYfpfunc:
case TYfsfunc:
case TYf16func:
case TYhfunc:
case TYnfunc: /* in case program plays games with function pointers */
case TYnpfunc:
case TYnsfunc:
case TYifunc:
case TYjfunc:
version (SCPP_HTOD)
{
case TYmfunc:
if (config.ansi_c)
synerr(EM_unknown_size,"function".ptr); /* size of function is not known */
}
s = 1;
break;
case TYarray:
{
if (t.Tflags & TFsizeunknown)
{
version (SCPP_HTOD)
{
synerr(EM_unknown_size,"array".ptr); /* size of array is unknown */
}
}
if (t.Tflags & TFvla)
{
s = _tysize[pointertype];
break;
}
s = type_size(t.Tnext);
uint u = cast(uint)t.Tdim * cast(uint) s;
version (SCPP_HTOD)
{
type_chksize(u);
}
else version (MARS)
{
if (t.Tdim && ((u / t.Tdim) != s || cast(int)u < 0))
assert(0); // overflow should have been detected in front end
}
else
{
static assert(0);
}
s = u;
break;
}
case TYstruct:
{
auto ts = t.Ttag.Stype; // find main instance
// (for const struct X)
assert(ts.Ttag);
s = ts.Ttag.Sstruct.Sstructsize;
break;
}
version (SCPP_HTOD)
{
case TYenum:
if (t.Ttag.Senum.SEflags & SENforward)
synerr(EM_unknown_size, prettyident(cast(Symbol*)t.Ttag));
s = type_size(t.Tnext);
break;
}
case TYvoid:
version (SCPP_HTOD) static if (TARGET_WINDOS) // GNUC allows it, so we will, too
{
synerr(EM_void_novalue); // voids have no value
}
s = 1;
break;
case TYref:
version (MARS)
{
s = tysize(TYnptr);
break;
}
version (SCPP_HTOD)
{
case TYmemptr:
case TYvtshape:
s = tysize(tym_conv(t));
break;
case TYident:
synerr(EM_unknown_size, t.Tident);
s = 1;
break;
}
default:
debug WRTYxx(t.Tty);
assert(0);
}
}
return s;
}
/********************************
* Return the size of a type for alignment purposes.
*/
@trusted
uint type_alignsize(type *t)
{ targ_size_t sz;
L1:
type_debug(t);
sz = tyalignsize(t.Tty);
if (sz == cast(targ_size_t)-1)
{
switch (tybasic(t.Tty))
{
case TYarray:
if (t.Tflags & TFsizeunknown)
goto err1;
t = t.Tnext;
goto L1;
case TYstruct:
t = t.Ttag.Stype; // find main instance
// (for const struct X)
if (t.Tflags & TFsizeunknown)
goto err1;
sz = t.Ttag.Sstruct.Salignsize;
if (sz > t.Ttag.Sstruct.Sstructalign + 1)
sz = t.Ttag.Sstruct.Sstructalign + 1;
break;
case TYldouble:
assert(0);
default:
err1: // let type_size() handle error messages
sz = type_size(t);
break;
}
}
//printf("type_alignsize() = %d\n", sz);
return cast(uint)sz;
}
/***********************************
* Compute special zero sized struct.
* Params:
* t = type of parameter
* tyf = function type
* Returns:
* true if it is
*/
@trusted
bool type_zeroSize(type *t, tym_t tyf)
{
if (tyf != TYjfunc && config.exe & (EX_FREEBSD | EX_OPENBSD | EX_OSX))
{
/* Use clang convention for 0 size structs
*/
if (t && tybasic(t.Tty) == TYstruct)
{
type *ts = t.Ttag.Stype; // find main instance
// (for const struct X)
if (ts.Tflags & TFsizeunknown)
{
version (SCPP_HTOD)
{
template_instantiate_forward(ts.Ttag);
if (ts.Tflags & TFsizeunknown)
synerr(EM_unknown_size,ts.Tty & TYstruct ? prettyident(ts.Ttag) : "struct");
ts.Tflags &= ~TFsizeunknown;
}
}
if (ts.Ttag.Sstruct.Sflags & STR0size)
//{ printf("0size\n"); type_print(t); *(char*)0=0;
return true;
//}
}
}
return false;
}
/*********************************
* Compute the size of a single parameter.
* Params:
* t = type of parameter
* tyf = function type
* Returns:
* size in bytes
*/
uint type_parameterSize(type *t, tym_t tyf)
{
if (type_zeroSize(t, tyf))
return 0;
return cast(uint)type_size(t);
}
/*****************************
* Compute the total size of parameters for function call.
* Used for stdcall name mangling.
* Note that hidden parameters do not contribute to size.
* Params:
* t = function type
* Returns:
* total stack usage in bytes
*/
@trusted
uint type_paramsize(type *t)
{
targ_size_t sz = 0;
if (tyfunc(t.Tty))
{
for (param_t *p = t.Tparamtypes; p; p = p.Pnext)
{
const size_t n = type_parameterSize(p.Ptype, tybasic(t.Tty));
sz += _align(REGSIZE,n); // align to REGSIZE boundary
}
}
return cast(uint)sz;
}
/*****************************
* Create a type & initialize it.
* Input:
* ty = TYxxxx
* Returns:
* pointer to newly created type.
*/
@trusted
type *type_alloc(tym_t ty)
{ type *t;
assert(tybasic(ty) != TYtemplate);
if (type_list)
{ t = type_list;
type_list = t.Tnext;
}
else
t = cast(type *) mem_fmalloc(type.sizeof);
*t = type();
t.Tty = ty;
version (SRCPOS_4TYPES)
{
if (PARSER && config.fulltypes)
t.Tsrcpos = getlinnum();
}
debug
{
t.id = type.IDtype;
type_num++;
if (type_num > type_max)
type_max = type_num;
}
//printf("type_alloc() = %p ",t); WRTYxx(t.Tty); printf("\n");
//if (t == (type*)0xB6B744) *(char*)0=0;
return t;
}
/*************************************
* Allocate a TYtemplate.
*/
version (SCPP_HTOD)
{
type *type_alloc_template(Symbol *s)
{ type *t;
t = cast(type *) mem_fmalloc(typetemp_t.sizeof);
memset(t, 0, typetemp_t.sizeof);
t.Tty = TYtemplate;
if (s.Stemplate.TMprimary)
s = s.Stemplate.TMprimary;
(cast(typetemp_t *)t).Tsym = s;
version (SRCPOS_4TYPES)
{
if (PARSER && config.fulltypes)
t.Tsrcpos = getlinnum();
}
debug
{
t.id = type.IDtype;
type_num++;
if (type_num > type_max)
type_max = type_num;
//printf("Alloc'ing template type %p ",t); WRTYxx(t.Tty); printf("\n");
}
return t;
}
}
/*****************************
* Fake a type & initialize it.
* Input:
* ty = TYxxxx
* Returns:
* pointer to newly created type.
*/
type *type_fake(tym_t ty)
{ type *t;
version (MARS)
assert(ty != TYstruct);
t = type_alloc(ty);
if (typtr(ty) || tyfunc(ty))
{ t.Tnext = type_alloc(TYvoid); /* fake with pointer to void */
t.Tnext.Tcount = 1;
}
return t;
}
/*****************************
* Allocate a type of ty with a Tnext of tn.
*/
type *type_allocn(tym_t ty,type *tn)
{ type *t;
//printf("type_allocn(ty = x%x, tn = %p)\n", ty, tn);
assert(tn);
type_debug(tn);
t = type_alloc(ty);
t.Tnext = tn;
tn.Tcount++;
//printf("\tt = %p\n", t);
return t;
}
/******************************
* Allocate a TYmemptr type.
*/
version (SCPP_HTOD)
{
type *type_allocmemptr(Classsym *stag,type *tn)
{ type *t;
symbol_debug(stag);
assert(stag.Sclass == SCstruct || tybasic(stag.Stype.Tty) == TYident);
t = type_allocn(TYmemptr,tn);
t.Ttag = stag;
//printf("type_allocmemptr() = %p\n", t);
//type_print(t);
return t;
}
}
/********************************
* Allocate a pointer type.
* Returns:
* Tcount already incremented
*/
type *type_pointer(type *tnext)
{
type *t = type_allocn(TYnptr, tnext);
t.Tcount++;
return t;
}
/********************************
* Allocate a dynamic array type.
* Returns:
* Tcount already incremented
*/
@trusted
type *type_dyn_array(type *tnext)
{
type *t = type_allocn(TYdarray, tnext);
t.Tcount++;
return t;
}
/********************************
* Allocate a static array type.
* Returns:
* Tcount already incremented
*/
extern (C) type *type_static_array(targ_size_t dim, type *tnext)
{
type *t = type_allocn(TYarray, tnext);
t.Tdim = dim;
t.Tcount++;
return t;
}
/********************************
* Allocate an associative array type,
* which are key=value pairs
* Returns:
* Tcount already incremented
*/
@trusted
type *type_assoc_array(type *tkey, type *tvalue)
{
type *t = type_allocn(TYaarray, tvalue);
t.Tkey = tkey;
tkey.Tcount++;
t.Tcount++;
return t;
}
/********************************
* Allocate a delegate type.
* Returns:
* Tcount already incremented
*/
@trusted
type *type_delegate(type *tnext)
{
type *t = type_allocn(TYdelegate, tnext);
t.Tcount++;
return t;
}
/***********************************
* Allocation a function type.
* Params:
* tyf = function type
* ptypes = types of the function parameters
* variadic = if ... function
* tret = return type
* Returns:
* Tcount already incremented
*/
@trusted
extern (C)
type *type_function(tym_t tyf, type*[] ptypes, bool variadic, type *tret)
{
param_t *paramtypes = null;
foreach (p; ptypes)
{
param_append_type(¶mtypes, p);
}
type *t = type_allocn(tyf, tret);
t.Tflags |= TFprototype;
if (!variadic)
t.Tflags |= TFfixed;
t.Tparamtypes = paramtypes;
t.Tcount++;
return t;
}
/***************************************
* Create an enum type.
* Input:
* name name of enum
* tbase "base" type of enum
* Returns:
* Tcount already incremented
*/
@trusted
type *type_enum(const(char)* name, type *tbase)
{
Symbol *s = symbol_calloc(name);
s.Sclass = SCenum;
s.Senum = cast(enum_t *) MEM_PH_CALLOC(enum_t.sizeof);
s.Senum.SEflags |= SENforward; // forward reference
type *t = type_allocn(TYenum, tbase);
t.Ttag = cast(Classsym *)s; // enum tag name
t.Tcount++;
s.Stype = t;
t.Tcount++;
return t;
}
/**************************************
* Create a struct/union/class type.
* Params:
* name = name of struct (this function makes its own copy of the string)
* is0size = if struct has no fields (even if Sstructsize is 1)
* Returns:
* Tcount already incremented
*/
@trusted
type *type_struct_class(const(char)* name, uint alignsize, uint structsize,
type *arg1type, type *arg2type, bool isUnion, bool isClass, bool isPOD, bool is0size)
{
Symbol *s = symbol_calloc(name);
s.Sclass = SCstruct;
s.Sstruct = struct_calloc();
s.Sstruct.Salignsize = alignsize;
s.Sstruct.Sstructalign = cast(ubyte)alignsize;
s.Sstruct.Sstructsize = structsize;
s.Sstruct.Sarg1type = arg1type;
s.Sstruct.Sarg2type = arg2type;
if (!isPOD)
s.Sstruct.Sflags |= STRnotpod;
if (isUnion)
s.Sstruct.Sflags |= STRunion;
if (isClass)
{ s.Sstruct.Sflags |= STRclass;
assert(!isUnion && isPOD);
}
if (is0size)
s.Sstruct.Sflags |= STR0size;
type *t = type_alloc(TYstruct);
t.Ttag = cast(Classsym *)s; // structure tag name
t.Tcount++;
s.Stype = t;
t.Tcount++;
return t;
}
/*****************************
* Free up data type.
*/
@trusted
void type_free(type *t)
{ type *tn;
tym_t ty;
while (t)
{
//printf("type_free(%p, Tcount = %d)\n", t, t.Tcount);
type_debug(t);
assert(cast(int)t.Tcount != -1);
if (--t.Tcount) /* if usage count doesn't go to 0 */
break;
ty = tybasic(t.Tty);
if (tyfunc(ty))
{ param_free(&t.Tparamtypes);
list_free(&t.Texcspec, cast(list_free_fp)&type_free);
goto L1;
}
version (SCPP_HTOD)
{
if (ty == TYtemplate)
{
param_free(&t.Tparamtypes);
goto L1;
}
if (ty == TYident)
{
MEM_PH_FREE(t.Tident);
goto L1;
}
}
if (t.Tflags & TFvla && t.Tel)
{
el_free(t.Tel);
goto L1;
}
version (SCPP_HTOD)
{
if (t.Talternate && typtr(ty))
{
type_free(t.Talternate);
goto L1;
}
}
version (MARS)
{
if (t.Tkey && typtr(ty))
type_free(t.Tkey);
}
L1:
debug
{
type_num--;
//printf("Free'ing type %p ",t); WRTYxx(t.Tty); printf("\n");
t.id = 0; /* no longer a valid type */
}
tn = t.Tnext;
t.Tnext = type_list;
type_list = t; /* link into free list */
t = tn;
}
}
version (STATS)
{
/* count number of free types available on type list */
void type_count_free()
{
type *t;
int count;
for(t=type_list;t;t=t.Tnext)
count++;
printf("types on free list %d with max of %d\n",count,type_max);
}
}
/**********************************
* Initialize type package.
*/
private type * type_allocbasic(tym_t ty)
{ type *t;
t = type_alloc(ty);
t.Tmangle = mTYman_c;
t.Tcount = 1; /* so it is not inadvertently free'd */
return t;
}
@trusted
void type_init()
{
tstypes[TYbool] = type_allocbasic(TYbool);
tstypes[TYwchar_t] = type_allocbasic(TYwchar_t);
tstypes[TYdchar] = type_allocbasic(TYdchar);
tstypes[TYvoid] = type_allocbasic(TYvoid);
tstypes[TYnullptr] = type_allocbasic(TYnullptr);
tstypes[TYchar16] = type_allocbasic(TYchar16);
tstypes[TYuchar] = type_allocbasic(TYuchar);
tstypes[TYschar] = type_allocbasic(TYschar);
tstypes[TYchar] = type_allocbasic(TYchar);
tstypes[TYshort] = type_allocbasic(TYshort);
tstypes[TYushort] = type_allocbasic(TYushort);
tstypes[TYint] = type_allocbasic(TYint);
tstypes[TYuint] = type_allocbasic(TYuint);
tstypes[TYlong] = type_allocbasic(TYlong);
tstypes[TYulong] = type_allocbasic(TYulong);
tstypes[TYllong] = type_allocbasic(TYllong);
tstypes[TYullong] = type_allocbasic(TYullong);
tstypes[TYfloat] = type_allocbasic(TYfloat);
tstypes[TYdouble] = type_allocbasic(TYdouble);
tstypes[TYdouble_alias] = type_allocbasic(TYdouble_alias);
tstypes[TYldouble] = type_allocbasic(TYldouble);
tstypes[TYifloat] = type_allocbasic(TYifloat);
tstypes[TYidouble] = type_allocbasic(TYidouble);
tstypes[TYildouble] = type_allocbasic(TYildouble);
tstypes[TYcfloat] = type_allocbasic(TYcfloat);
tstypes[TYcdouble] = type_allocbasic(TYcdouble);
tstypes[TYcldouble] = type_allocbasic(TYcldouble);
if (I64)
{
TYptrdiff = TYllong;
TYsize = TYullong;
tsptrdiff = tstypes[TYllong];
tssize = tstypes[TYullong];
}
else
{
TYptrdiff = TYint;
TYsize = TYuint;
tsptrdiff = tstypes[TYint];
tssize = tstypes[TYuint];
}
// Type of trace function
tstrace = type_fake(I16 ? TYffunc : TYnfunc);
tstrace.Tmangle = mTYman_c;
tstrace.Tcount++;
chartype = (config.flags3 & CFG3ju) ? tstypes[TYuchar] : tstypes[TYchar];
// Type of far library function
tsclib = type_fake(LARGECODE ? TYfpfunc : TYnpfunc);
tsclib.Tmangle = mTYman_c;
tsclib.Tcount++;
tspvoid = type_allocn(pointertype,tstypes[TYvoid]);
tspvoid.Tmangle = mTYman_c;
tspvoid.Tcount++;
// Type of far library function
tsjlib = type_fake(TYjfunc);
tsjlib.Tmangle = mTYman_c;
tsjlib.Tcount++;
tsdlib = tsjlib;
version (SCPP_HTOD)
{
tspcvoid = type_alloc(mTYconst | TYvoid);
tspcvoid = newpointer(tspcvoid);
tspcvoid.Tmangle = mTYman_c;
tspcvoid.Tcount++;
}
// Type of logical expression
tslogical = (config.flags4 & CFG4bool) ? tstypes[TYbool] : tstypes[TYint];
for (int i = 0; i < TYMAX; i++)
{
if (tstypes[i])
{ tsptr2types[i] = type_allocn(pointertype,tstypes[i]);
tsptr2types[i].Tcount++;
}
}
}
/**********************************
* Free type_list.
*/
void type_term()
{
static if (TERMCODE)
{
type *tn;
param_t *pn;
int i;
for (i = 0; i < tstypes.length; i++)
{ type *t = tsptr2types[i];
if (t)
{ assert(!(t.Tty & (mTYconst | mTYvolatile | mTYimmutable | mTYshared)));
assert(!(t.Tflags));
assert(!(t.Tmangle));
type_free(t);
}
type_free(tstypes[i]);
}
type_free(tsclib);
type_free(tspvoid);
type_free(tspcvoid);
type_free(tsjlib);
type_free(tstrace);
while (type_list)
{ tn = type_list.Tnext;
mem_ffree(type_list);
type_list = tn;
}
while (param_list)
{ pn = param_list.Pnext;
mem_ffree(param_list);
param_list = pn;
}
debug
{
printf("Max # of types = %d\n",type_max);
if (type_num != 0)
printf("type_num = %d\n",type_num);
/* assert(type_num == 0);*/
}
}
}
/*******************************
* Type type information.
*/
/**************************
* Make copy of a type.
*/
@trusted
type *type_copy(type *t)
{ type *tn;
param_t *p;
type_debug(t);
version (SCPP_HTOD)
{
if (tybasic(t.Tty) == TYtemplate)
{
tn = type_alloc_template((cast(typetemp_t *)t).Tsym);
}
else
tn = type_alloc(t.Tty);
}
else
tn = type_alloc(t.Tty);
*tn = *t;
switch (tybasic(tn.Tty))
{
version (SCPP_HTOD)
{
case TYtemplate:
(cast(typetemp_t *)tn).Tsym = (cast(typetemp_t *)t).Tsym;
goto L1;
case TYident:
tn.Tident = cast(char *)MEM_PH_STRDUP(t.Tident);
break;
}
case TYarray:
if (tn.Tflags & TFvla)
tn.Tel = el_copytree(tn.Tel);
break;
default:
if (tyfunc(tn.Tty))
{
L1:
tn.Tparamtypes = null;
for (p = t.Tparamtypes; p; p = p.Pnext)
{ param_t *pn;
pn = param_append_type(&tn.Tparamtypes,p.Ptype);
if (p.Pident)
{
pn.Pident = cast(char *)MEM_PH_STRDUP(p.Pident);
}
assert(!p.Pelem);
}
}
else
{
version (SCPP_HTOD)
{
if (tn.Talternate && typtr(tn.Tty))
tn.Talternate.Tcount++;
}
version (MARS)
{
if (tn.Tkey && typtr(tn.Tty))
tn.Tkey.Tcount++;
}
}
break;
}