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Compiler arrays (#49)

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* implemented operation and param flags in the cli invoke cmd.

* reverted prev changes and added debug flag for compiling.

* change transactionType variable to Type, for package convention

* index support for arrays.

* implemented builtin (len) for the compiler.

* bumped version -> 0.35.0

* updated compiler README and changed invoke to testinvoke.
This commit is contained in:
Anthony De Meulemeester 2018-03-25 18:21:00 +02:00 • committed by GitHub
parent 62ceb0b42c
commit 34bd9d31ac
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GPG key ID: 4AEE18F83AFDEB23
11 changed files with 270 additions and 81 deletions
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64
pkg/vm/compiler/codegen.go
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@ -80,7 +80,10 @@ func (c *codegen) emitLoadLocal(name string) {
if pos < 0 {
log.Fatalf("cannot load local variable with position: %d", pos)
}
c.emitLoadLocalPos(pos)
}
func (c *codegen) emitLoadLocalPos(pos int) {
emitOpcode(c.prog, vm.Ofromaltstack)
emitOpcode(c.prog, vm.Odup)
emitOpcode(c.prog, vm.Otoaltstack)
@ -104,7 +107,7 @@ func (c *codegen) emitStoreLocal(pos int) {
emitOpcode(c.prog, vm.Osetitem)
}
func (c *codegen) emitLoadStructField(i int) {
func (c *codegen) emitLoadField(i int) {
emitInt(c.prog, int64(i))
emitOpcode(c.prog, vm.Opickitem)
}
@ -383,7 +386,7 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
switch fun := n.Fun.(type) {
case *ast.Ident:
f, ok = c.funcs[fun.Name]
if !ok {
if !ok && !isBuiltin(n.Fun) {
log.Fatalf("could not resolve function %s", fun.Name)
}
case *ast.SelectorExpr:
@ -418,7 +421,12 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
// will put them in. ^^
emitOpcode(c.prog, vm.Onop)
if isSyscall(f.name) {
// Check builtin first to avoid nil pointer on funcScope!
if isBuiltin(n.Fun) {
// Use the ident to check, builtins are not in func scopes.
// We can be sure builtins are of type *ast.Ident.
c.convertBuiltin(n.Fun.(*ast.Ident).Name, n)
} else if isSyscall(f.name) {
c.convertSyscall(f.name)
} else {
emitCall(c.prog, vm.Ocall, int16(f.label))
@ -438,7 +446,7 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
if strct, ok := typ.(*types.Struct); ok {
c.emitLoadLocal(t.Name) // load the struct
i := indexOfStruct(strct, n.Sel.Name)
c.emitLoadStructField(i) // load the field
c.emitLoadField(i) // load the field
}
default:
log.Fatal("nested selectors not supported yet")
@ -446,7 +454,23 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
return nil
case *ast.UnaryExpr:
// fmt.Println(n)
// TODO(@anthdm)
case *ast.IndexExpr:
// Walk the expression, this could be either an Ident or SelectorExpr.
// This will load local whatever X is.
ast.Walk(c, n.X)
switch n.Index.(type) {
case *ast.BasicLit:
t := c.typeInfo.Types[n.Index]
val, _ := constant.Int64Val(t.Value)
c.emitLoadField(int(val))
default:
ast.Walk(c, n.Index)
emitOpcode(c.prog, vm.Opickitem) // just pickitem here
}
return nil
}
return c
}
@ -460,6 +484,15 @@ func (c *codegen) convertSyscall(name string) {
emitOpcode(c.prog, vm.Onop)
}
func (c *codegen) convertBuiltin(name string, expr *ast.CallExpr) {
switch name {
case "len":
emitOpcode(c.prog, vm.Oarraysize)
case "append":
log.Fatal("builtin (append) not yet implemented.")
}
}
func (c *codegen) convertByteArray(lit *ast.CompositeLit) {
buf := make([]byte, len(lit.Elts))
for i := 0; i < len(lit.Elts); i++ {
@ -633,24 +666,3 @@ func (c *codegen) writeJumps() {
}
}
}
func isSyscall(name string) bool {
_, ok := vm.Syscalls[name]
return ok
}
var noRetSyscalls = []string{
"Notify", "Log", "Put", "Register", "Delete",
"SetVotes", "ContractDestroy", "MerkleRoot", "Hash",
"PrevHash", "GetHeader",
}
// isNoRetSyscall checks if the syscall has a return value.
func isNoRetSyscall(name string) bool {
for _, s := range noRetSyscalls {
if s == name {
return true
}
}
return false
}