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// Copyright (C) 2020-2023 Free Software Foundation, Inc.
// This file is part of GCC.
// 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 "rust-compile-block.h"
#include "rust-compile-stmt.h"
#include "rust-compile-expr.h"
namespace Rust {
namespace Compile {
CompileBlock::CompileBlock (Context *ctx, Bvariable *result)
: HIRCompileBase (ctx), translated (nullptr), result (result)
{}
tree
CompileBlock::compile (HIR::BlockExpr *expr, Context *ctx, Bvariable *result)
{
CompileBlock compiler (ctx, result);
compiler.visit (*expr);
return compiler.translated;
}
void
CompileBlock::visit (HIR::BlockExpr &expr)
{
fncontext fnctx = ctx->peek_fn ();
tree fndecl = fnctx.fndecl;
Location start_location = expr.get_locus ();
Location end_location = expr.get_end_locus ();
auto body_mappings = expr.get_mappings ();
Resolver::Rib *rib = nullptr;
if (!ctx->get_resolver ()->find_name_rib (body_mappings.get_nodeid (), &rib))
{
rust_fatal_error (expr.get_locus (), "failed to setup locals per block");
return;
}
std::vector<Bvariable *> locals
= compile_locals_for_block (ctx, *rib, fndecl);
tree enclosing_scope = ctx->peek_enclosing_scope ();
tree new_block = ctx->get_backend ()->block (fndecl, enclosing_scope, locals,
start_location, end_location);
ctx->push_block (new_block);
for (auto &s : expr.get_statements ())
{
auto compiled_expr = CompileStmt::Compile (s.get (), ctx);
if (compiled_expr != nullptr)
{
tree s = convert_to_void (compiled_expr, ICV_STATEMENT);
ctx->add_statement (s);
}
}
if (expr.has_expr ())
{
// the previous passes will ensure this is a valid return or
// a valid trailing expression
tree compiled_expr = CompileExpr::Compile (expr.expr.get (), ctx);
if (compiled_expr != nullptr)
{
if (result == nullptr)
{
ctx->add_statement (compiled_expr);
}
else
{
tree result_reference = ctx->get_backend ()->var_expression (
result, expr.get_final_expr ()->get_locus ());
tree assignment
= ctx->get_backend ()->assignment_statement (result_reference,
compiled_expr,
expr.get_locus ());
ctx->add_statement (assignment);
}
}
}
ctx->pop_block ();
translated = new_block;
}
void
CompileConditionalBlocks::visit (HIR::IfExpr &expr)
{
fncontext fnctx = ctx->peek_fn ();
tree fndecl = fnctx.fndecl;
tree condition_expr = CompileExpr::Compile (expr.get_if_condition (), ctx);
tree then_block = CompileBlock::compile (expr.get_if_block (), ctx, result);
translated
= ctx->get_backend ()->if_statement (fndecl, condition_expr, then_block,
NULL, expr.get_locus ());
}
void
CompileConditionalBlocks::visit (HIR::IfExprConseqElse &expr)
{
fncontext fnctx = ctx->peek_fn ();
tree fndecl = fnctx.fndecl;
tree condition_expr = CompileExpr::Compile (expr.get_if_condition (), ctx);
tree then_block = CompileBlock::compile (expr.get_if_block (), ctx, result);
tree else_block = CompileBlock::compile (expr.get_else_block (), ctx, result);
translated
= ctx->get_backend ()->if_statement (fndecl, condition_expr, then_block,
else_block, expr.get_locus ());
}
void
CompileConditionalBlocks::visit (HIR::IfExprConseqIf &expr)
{
fncontext fnctx = ctx->peek_fn ();
tree fndecl = fnctx.fndecl;
tree condition_expr = CompileExpr::Compile (expr.get_if_condition (), ctx);
tree then_block = CompileBlock::compile (expr.get_if_block (), ctx, result);
// else block
std::vector<Bvariable *> locals;
Location start_location = expr.get_conseq_if_expr ()->get_locus ();
Location end_location = expr.get_conseq_if_expr ()->get_locus (); // FIXME
tree enclosing_scope = ctx->peek_enclosing_scope ();
tree else_block = ctx->get_backend ()->block (fndecl, enclosing_scope, locals,
start_location, end_location);
ctx->push_block (else_block);
tree else_stmt_decl
= CompileConditionalBlocks::compile (expr.get_conseq_if_expr (), ctx,
result);
ctx->add_statement (else_stmt_decl);
ctx->pop_block ();
translated
= ctx->get_backend ()->if_statement (fndecl, condition_expr, then_block,
else_block, expr.get_locus ());
}
} // namespace Compile
} // namespace Rust
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