mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-12-28 11:36:17 +00:00
123 lines
3 KiB
Go
123 lines
3 KiB
Go
package compiler
|
|
|
|
import (
|
|
"go/ast"
|
|
"go/types"
|
|
)
|
|
|
|
// A funcScope represents the scope within the function context.
|
|
// It holds all the local variables along with the initialized struct positions.
|
|
type funcScope struct {
|
|
// Identifier of the function.
|
|
name string
|
|
|
|
// Selector of the function if there is any. Only functions imported
|
|
// from other packages should have a selector.
|
|
selector ast.Expr
|
|
|
|
// The declaration of the function in the AST. Nil if this scope is not a function.
|
|
decl *ast.FuncDecl
|
|
|
|
// Package where the function is defined.
|
|
pkg *types.Package
|
|
|
|
file *ast.File
|
|
|
|
// Program label of the scope
|
|
label uint16
|
|
|
|
// Range of opcodes corresponding to the function.
|
|
rng DebugRange
|
|
// Variables together with it's type in neo-vm.
|
|
variables []string
|
|
|
|
// deferStack is a stack containing encountered `defer` statements.
|
|
deferStack []deferInfo
|
|
|
|
// Local variables
|
|
vars varScope
|
|
|
|
// voidCalls are basically functions that return their value
|
|
// into nothing. The stack has their return value but there
|
|
// is nothing that consumes it. We need to keep track of
|
|
// these functions so we can cleanup (drop) the returned
|
|
// value from the stack. We also need to add every voidCall
|
|
// return value to the stack size.
|
|
voidCalls map[*ast.CallExpr]bool
|
|
|
|
// Local variable counter.
|
|
i int
|
|
}
|
|
|
|
type deferInfo struct {
|
|
catchLabel uint16
|
|
finallyLabel uint16
|
|
expr *ast.CallExpr
|
|
localIndex int
|
|
}
|
|
|
|
const (
|
|
finallyVarName = "<finally>"
|
|
exceptionVarName = "<exception>"
|
|
)
|
|
|
|
func (c *codegen) newFuncScope(decl *ast.FuncDecl, label uint16) *funcScope {
|
|
var name string
|
|
if decl.Name != nil {
|
|
name = decl.Name.Name
|
|
}
|
|
return &funcScope{
|
|
name: name,
|
|
decl: decl,
|
|
label: label,
|
|
pkg: c.currPkg.Types,
|
|
vars: newVarScope(),
|
|
voidCalls: map[*ast.CallExpr]bool{},
|
|
variables: []string{},
|
|
i: -1,
|
|
}
|
|
}
|
|
|
|
func (c *codegen) getFuncNameFromDecl(pkgPath string, decl *ast.FuncDecl) string {
|
|
name := decl.Name.Name
|
|
if decl.Recv != nil {
|
|
switch t := decl.Recv.List[0].Type.(type) {
|
|
case *ast.Ident:
|
|
name = t.Name + "." + name
|
|
case *ast.StarExpr:
|
|
name = t.X.(*ast.Ident).Name + "." + name
|
|
}
|
|
}
|
|
return c.getIdentName(pkgPath, name)
|
|
}
|
|
|
|
// analyzeVoidCalls checks for functions that are not assigned
|
|
// and therefore we need to cleanup the return value from the stack.
|
|
func (c *funcScope) analyzeVoidCalls(node ast.Node) bool {
|
|
est, ok := node.(*ast.ExprStmt)
|
|
if ok {
|
|
ce, ok := est.X.(*ast.CallExpr)
|
|
if ok {
|
|
c.voidCalls[ce] = true
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
func (c *funcScope) countArgs() int {
|
|
n := c.decl.Type.Params.NumFields()
|
|
if c.decl.Recv != nil {
|
|
n += c.decl.Recv.NumFields()
|
|
}
|
|
return n
|
|
}
|
|
|
|
// newVariable creates a new local variable or argument in the scope of the function.
|
|
func (c *funcScope) newVariable(t varType, name string) int {
|
|
return c.vars.newVariable(t, name)
|
|
}
|
|
|
|
// newLocal creates a new local variable into the scope of the function.
|
|
func (c *funcScope) newLocal(name string) int {
|
|
return c.newVariable(varLocal, name)
|
|
}
|