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/* d-compiler.cc -- D frontend interface to the gcc back-end.
Copyright (C) 2020-2021 Free Software Foundation, Inc.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "dmd/compiler.h"
#include "dmd/scope.h"
#include "dmd/expression.h"
#include "dmd/identifier.h"
#include "dmd/module.h"
#include "dmd/mtype.h"
#include "tree.h"
#include "fold-const.h"
#include "d-tree.h"
/* Implements the Compiler interface used by the frontend. */
/* Generate C main() in response to seeing D main(). This used to be in
libdruntime, but contained a reference to _Dmain which didn't work when
druntime was made into a shared library and was linked to a program, such
as a C++ program, that didn't have a _Dmain. */
void
Compiler::genCmain (Scope *sc)
{
static bool initialized = false;
if (initialized)
return;
/* The D code to be generated is provided by __entrypoint.di, try to load it,
but don't fail if unfound. */
unsigned errors = global.startGagging ();
Module *m = Module::load (Loc (), NULL, Identifier::idPool ("__entrypoint"));
if (global.endGagging (errors))
m = NULL;
if (m != NULL)
{
m->importedFrom = m;
m->importAll (NULL);
dsymbolSemantic (m, NULL);
semantic2 (m, NULL);
semantic3 (m, NULL);
d_add_entrypoint_module (m, sc->_module);
}
initialized = true;
}
/* Perform a reinterpret cast of EXPR to type TYPE for use in CTFE.
The front end should have already ensured that EXPR is a constant,
so we just lower the value to GCC and return the converted CST. */
Expression *
Compiler::paintAsType (UnionExp *, Expression *expr, Type *type)
{
/* We support up to 512-bit values. */
unsigned char buffer[64];
tree cst;
Type *tb = type->toBasetype ();
if (expr->type->isintegral ())
cst = build_integer_cst (expr->toInteger (), build_ctype (expr->type));
else if (expr->type->isfloating ())
cst = build_float_cst (expr->toReal (), expr->type);
else if (expr->op == TOKarrayliteral)
{
/* Build array as VECTOR_CST, assumes EXPR is constant. */
Expressions *elements = expr->isArrayLiteralExp ()->elements;
vec <constructor_elt, va_gc> *elms = NULL;
vec_safe_reserve (elms, elements->length);
for (size_t i = 0; i < elements->length; i++)
{
Expression *e = (*elements)[i];
if (e->type->isintegral ())
{
tree value = build_integer_cst (e->toInteger (),
build_ctype (e->type));
CONSTRUCTOR_APPEND_ELT (elms, size_int (i), value);
}
else if (e->type->isfloating ())
{
tree value = build_float_cst (e->toReal (), e->type);
CONSTRUCTOR_APPEND_ELT (elms, size_int (i), value);
}
else
gcc_unreachable ();
}
/* Build vector type. */
int nunits = expr->type->isTypeSArray ()->dim->toUInteger ();
Type *telem = expr->type->nextOf ();
tree vectype = build_vector_type (build_ctype (telem), nunits);
cst = build_vector_from_ctor (vectype, elms);
}
else
gcc_unreachable ();
/* Encode CST to buffer. */
int len = native_encode_expr (cst, buffer, sizeof (buffer));
if (tb->ty == Tsarray)
{
/* Interpret value as a vector of the same size,
then return the array literal. */
int nunits = type->isTypeSArray ()->dim->toUInteger ();
Type *elem = type->nextOf ();
tree vectype = build_vector_type (build_ctype (elem), nunits);
cst = native_interpret_expr (vectype, buffer, len);
Expression *e = d_eval_constant_expression (expr->loc, cst);
gcc_assert (e != NULL && e->op == TOKvector);
return e->isVectorExp ()->e1;
}
else
{
/* Normal interpret cast. */
cst = native_interpret_expr (build_ctype (type), buffer, len);
Expression *e = d_eval_constant_expression (expr->loc, cst);
gcc_assert (e != NULL);
return e;
}
}
/* Check imported module M for any special processing.
Modules we look out for are:
- object: For D runtime type information.
- gcc.builtins: For all gcc builtins.
- core.stdc.*: For all gcc library builtins. */
void
Compiler::onParseModule (Module *m)
{
ModuleDeclaration *md = m->md;
if (!md || !md->id || !md->packages)
{
Identifier *id = (md && md->id) ? md->id : m->ident;
if (!strcmp (id->toChars (), "object"))
create_tinfo_types (m);
}
else if (md->packages->length == 1)
{
if (!strcmp ((*md->packages)[0]->toChars (), "gcc")
&& !strcmp (md->id->toChars (), "builtins"))
d_build_builtins_module (m);
}
else if (md->packages->length == 2)
{
if (!strcmp ((*md->packages)[0]->toChars (), "core")
&& !strcmp ((*md->packages)[1]->toChars (), "stdc"))
d_add_builtin_module (m);
}
}
/* A callback function that is called once an imported module is parsed.
If the callback returns true, then it tells the front-end that the
driver intends on compiling the import. */
bool
Compiler::onImport (Module *)
{
return false;
}
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