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// Copyright 2022 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/tint/ir/builder.h"
#include <utility>
#include "src/tint/ir/builder_impl.h"
#include "src/tint/program.h"
namespace tint::ir {
Builder::Builder(const Program* prog) : ir(prog) {}
Builder::Builder(Module&& mod) : ir(std::move(mod)) {}
Builder::~Builder() = default;
Block* Builder::CreateBlock() {
return ir.flow_nodes.Create<Block>();
}
Terminator* Builder::CreateTerminator() {
return ir.flow_nodes.Create<Terminator>();
}
Function* Builder::CreateFunction(const ast::Function* ast_func) {
auto* ir_func = ir.flow_nodes.Create<Function>(ast_func);
ir_func->start_target = CreateBlock();
ir_func->end_target = CreateTerminator();
// Function is always branching into the start target
ir_func->start_target->inbound_branches.Push(ir_func);
return ir_func;
}
If* Builder::CreateIf(const ast::Statement* stmt) {
auto* ir_if = ir.flow_nodes.Create<If>(stmt);
ir_if->true_target = CreateBlock();
ir_if->false_target = CreateBlock();
ir_if->merge_target = CreateBlock();
// An if always branches to both the true and false block.
ir_if->true_target->inbound_branches.Push(ir_if);
ir_if->false_target->inbound_branches.Push(ir_if);
return ir_if;
}
Loop* Builder::CreateLoop(const ast::Statement* stmt) {
auto* ir_loop = ir.flow_nodes.Create<Loop>(stmt);
ir_loop->start_target = CreateBlock();
ir_loop->continuing_target = CreateBlock();
ir_loop->merge_target = CreateBlock();
// A loop always branches to the start block.
ir_loop->start_target->inbound_branches.Push(ir_loop);
return ir_loop;
}
Switch* Builder::CreateSwitch(const ast::SwitchStatement* stmt) {
auto* ir_switch = ir.flow_nodes.Create<Switch>(stmt);
ir_switch->merge_target = CreateBlock();
return ir_switch;
}
Block* Builder::CreateCase(Switch* s, const utils::VectorRef<const ast::CaseSelector*> selectors) {
s->cases.Push(Switch::Case{selectors, CreateBlock()});
Block* b = s->cases.Back().start_target;
// Switch branches into the case block
b->inbound_branches.Push(s);
return b;
}
void Builder::Branch(Block* from, FlowNode* to) {
TINT_ASSERT(IR, from);
TINT_ASSERT(IR, to);
from->branch_target = to;
to->inbound_branches.Push(from);
}
} // namespace tint::ir