60a3e0d778
During initialization of globals no function scope is present thus locals number is not saved anywere. Save it in `codegen` directly.
116 lines
3.4 KiB
Go
116 lines
3.4 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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"github.com/nspcc-dev/neo-go/pkg/vm/emit"
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"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
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)
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// inlineCall inlines call of n for function represented by f.
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// Call `f(a,b)` for definition `func f(x,y int)` is translated to block:
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// {
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// x := a
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// y := b
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// <inline body of f directly>
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// }
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func (c *codegen) inlineCall(f *funcScope, n *ast.CallExpr) {
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labelSz := len(c.labelList)
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offSz := len(c.inlineLabelOffsets)
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c.inlineLabelOffsets = append(c.inlineLabelOffsets, labelSz)
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defer func() {
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c.inlineLabelOffsets = c.inlineLabelOffsets[:offSz]
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c.labelList = c.labelList[:labelSz]
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}()
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pkg := c.buildInfo.program.Package(f.pkg.Path())
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sig := c.typeOf(n.Fun).(*types.Signature)
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// When inlined call is used during global initialization
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// there is no func scope, thus this if.
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if c.scope == nil {
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c.scope = &funcScope{}
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c.scope.vars.newScope()
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defer func() {
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if cnt := c.scope.vars.localsCnt; cnt > c.globalInlineCount {
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c.globalInlineCount = cnt
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}
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c.scope = nil
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}()
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}
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// Arguments need to be walked with the current scope,
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// while stored in the new.
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oldScope := c.scope.vars.locals
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c.scope.vars.newScope()
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newScope := make([]map[string]varInfo, len(c.scope.vars.locals))
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copy(newScope, c.scope.vars.locals)
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defer c.scope.vars.dropScope()
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hasVarArgs := !n.Ellipsis.IsValid()
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needPack := sig.Variadic() && hasVarArgs
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for i := range n.Args {
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c.scope.vars.locals = oldScope
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// true if normal arg or var arg is `slice...`
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needStore := i < sig.Params().Len()-1 || !sig.Variadic() || !hasVarArgs
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if !needStore {
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break
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}
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name := sig.Params().At(i).Name()
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if tv := c.typeAndValueOf(n.Args[i]); tv.Value != nil {
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c.scope.vars.locals = newScope
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c.scope.vars.addAlias(name, varLocal, unspecifiedVarIndex, tv)
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continue
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}
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if arg, ok := n.Args[i].(*ast.Ident); ok {
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// When function argument is variable or const, we may avoid
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// introducing additional variables for parameters.
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// This is done by providing additional alias to variable.
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if vi := c.scope.vars.getVarInfo(arg.Name); vi != nil {
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c.scope.vars.locals = newScope
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c.scope.vars.addAlias(name, vi.refType, vi.index, vi.tv)
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continue
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} else if arg.Name == "nil" {
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c.scope.vars.locals = newScope
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c.scope.vars.addAlias(name, varLocal, unspecifiedVarIndex, types.TypeAndValue{})
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continue
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} else if index, ok := c.globals[c.getIdentName("", arg.Name)]; ok {
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c.scope.vars.locals = newScope
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c.scope.vars.addAlias(name, varGlobal, index, types.TypeAndValue{})
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continue
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}
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}
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ast.Walk(c, n.Args[i])
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c.scope.vars.locals = newScope
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c.scope.newLocal(name)
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c.emitStoreVar("", name)
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}
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if needPack {
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// traverse variadic args and pack them
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// if they are provided directly i.e. without `...`
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c.scope.vars.locals = oldScope
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for i := sig.Params().Len() - 1; i < len(n.Args); i++ {
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ast.Walk(c, n.Args[i])
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}
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c.scope.vars.locals = newScope
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c.packVarArgs(n, sig)
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name := sig.Params().At(sig.Params().Len() - 1).Name()
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c.scope.newLocal(name)
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c.emitStoreVar("", name)
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}
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c.pkgInfoInline = append(c.pkgInfoInline, pkg)
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oldMap := c.importMap
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c.fillImportMap(f.file, pkg.Pkg)
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ast.Inspect(f.decl, c.scope.analyzeVoidCalls)
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ast.Walk(c, f.decl.Body)
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if c.scope.voidCalls[n] {
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for i := 0; i < f.decl.Type.Results.NumFields(); i++ {
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emit.Opcodes(c.prog.BinWriter, opcode.DROP)
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}
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}
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c.importMap = oldMap
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c.pkgInfoInline = c.pkgInfoInline[:len(c.pkgInfoInline)-1]
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}
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