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stmt_builder.go
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/
stmt_builder.go
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/*
* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
*
* 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.
*/
package ssa
import (
"bytes"
"fmt"
"go/types"
"log"
"github.com/goplus/llvm"
)
// -----------------------------------------------------------------------------
type aBasicBlock struct {
impl llvm.BasicBlock
fn Function
idx int
}
// BasicBlock represents a basic block in a function.
type BasicBlock = *aBasicBlock
// Parent returns the function to which the basic block belongs.
func (p BasicBlock) Parent() Function {
return p.fn
}
// Index returns the index of the basic block in the parent function.
func (p BasicBlock) Index() int {
return p.idx
}
// -----------------------------------------------------------------------------
type aBuilder struct {
impl llvm.Builder
fn Function
Prog Program
}
// Builder represents a builder for creating instructions in a function.
type Builder = *aBuilder
// SetBlock sets the current block to the specified basic block.
func (b Builder) SetBlock(blk BasicBlock) Builder {
if b.fn != blk.fn {
panic("mismatched function")
}
if debugInstr {
log.Printf("Block _llgo_%v:\n", blk.idx)
}
b.impl.SetInsertPointAtEnd(blk.impl)
return b
}
// Panic emits a panic instruction.
func (b Builder) Panic(v Expr) {
if debugInstr {
log.Printf("Panic %v\n", v.impl)
}
pkg := b.fn.pkg
b.Call(pkg.rtFunc("TracePanic"), v)
b.impl.CreateUnreachable()
}
// Unreachable emits an unreachable instruction.
func (b Builder) Unreachable() {
b.impl.CreateUnreachable()
}
// Return emits a return instruction.
func (b Builder) Return(results ...Expr) {
if debugInstr {
var b bytes.Buffer
fmt.Fprint(&b, "Return ")
for i, arg := range results {
if i > 0 {
fmt.Fprint(&b, ", ")
}
fmt.Fprint(&b, arg.impl)
}
log.Println(b.String())
}
switch n := len(results); n {
case 0:
b.impl.CreateRetVoid()
case 1:
b.impl.CreateRet(results[0].impl)
default:
tret := b.fn.t.(*types.Signature).Results()
b.impl.CreateAggregateRet(llvmValues(results, tret, b))
}
}
// Jump emits a jump instruction.
func (b Builder) Jump(jmpb BasicBlock) {
if b.fn != jmpb.fn {
panic("mismatched function")
}
if debugInstr {
log.Printf("Jump _llgo_%v\n", jmpb.idx)
}
b.impl.CreateBr(jmpb.impl)
}
// If emits an if instruction.
func (b Builder) If(cond Expr, thenb, elseb BasicBlock) {
if b.fn != thenb.fn || b.fn != elseb.fn {
panic("mismatched function")
}
if debugInstr {
log.Printf("If %v, _llgo_%v, _llgo_%v\n", cond.impl, thenb.idx, elseb.idx)
}
b.impl.CreateCondBr(cond.impl, thenb.impl, elseb.impl)
}
// The MapUpdate instruction updates the association of Map[Key] to
// Value.
//
// Pos() returns the ast.KeyValueExpr.Colon or ast.IndexExpr.Lbrack,
// if explicit in the source.
//
// Example printed form:
//
// t0[t1] = t2
func (b Builder) MapUpdate(m, k, v Expr) {
if debugInstr {
log.Printf("MapUpdate %v[%v] = %v\n", m.impl, k.impl, v.impl)
}
// TODO(xsw)
// panic("todo")
}
// -----------------------------------------------------------------------------