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