6dfc528ad1
This change rejiggers a few things so that we can more clearly introduce a boundary between front- and back-end compiler phases, including sharing more, like a diagnostics sink. Future extensions will include backend code-generation options.
350 lines
10 KiB
Go
350 lines
10 KiB
Go
// Copyright 2016 Marapongo, Inc. All rights reserved.
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package compiler
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"github.com/golang/glog"
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"github.com/satori/go.uuid"
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"github.com/marapongo/mu/pkg/ast"
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"github.com/marapongo/mu/pkg/compiler/backends"
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"github.com/marapongo/mu/pkg/compiler/backends/clouds"
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"github.com/marapongo/mu/pkg/compiler/backends/schedulers"
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"github.com/marapongo/mu/pkg/compiler/core"
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"github.com/marapongo/mu/pkg/diag"
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"github.com/marapongo/mu/pkg/errors"
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"github.com/marapongo/mu/pkg/workspace"
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)
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// Compiler provides an interface into the many phases of the Mu compilation process.
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type Compiler interface {
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core.Phase
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// Context returns the current compiler context.
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Context() *core.Context
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// Build detects and compiles inputs from the given location, storing build artifacts in the given destination.
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Build(inp string, outp string)
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// BuildFile uses the given Mufile directly, and stores build artifacts in the given destination.
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BuildFile(mufile []byte, ext string, outp string)
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}
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// compiler is the canonical implementation of the Mu compiler.
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type compiler struct {
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ctx *core.Context
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opts Options
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}
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// NewCompiler creates a new instance of the Mu compiler, with the given initialization settings.
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func NewCompiler(opts Options) Compiler {
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return &compiler{
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ctx: &core.Context{},
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opts: opts,
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}
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}
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func (c *compiler) Context() *core.Context {
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return c.ctx
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}
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func (c *compiler) Diag() diag.Sink {
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return c.opts.Diag
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}
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func (c *compiler) Build(inp string, outp string) {
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glog.Infof("Building target '%v' (out='%v')", inp, outp)
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// First find the root of the current package based on the location of its Mufile.
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mufile := c.detectMufile(inp)
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if mufile == "" {
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c.Diag().Errorf(errors.MissingMufile, inp)
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return
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}
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// Read in the contents of the document and make it available to subsequent stages.
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doc, err := diag.ReadDocument(mufile)
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if err != nil {
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c.Diag().Errorf(errors.CouldNotReadMufile.WithFile(mufile), err)
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return
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}
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c.buildDocument(doc, outp)
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}
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func (c *compiler) BuildFile(mufile []byte, ext string, outp string) {
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glog.Infof("Building in-memory %v file (bytes=%v out='%v')", ext, len(mufile), outp)
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c.buildDocument(&diag.Document{File: workspace.MufileBase + ext, Body: mufile}, outp)
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}
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func (c *compiler) buildDocument(doc *diag.Document, outp string) {
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glog.Infof("Building doc '%v' (bytes=%v out='%v')", doc.File, len(doc.Body), outp)
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if glog.V(2) {
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defer func() {
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glog.V(2).Infof("Building doc '%v' completed w/ %v warnings and %v errors",
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doc.File, c.Diag().Warnings(), c.Diag().Errors())
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}()
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}
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// Perform the front-end passes to generate a stack AST.
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stack, ok := c.parseStack(doc)
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if !ok {
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return
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}
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// Perform the semantic analysis passes to validate, transform, and/or update the AST.
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stack, ok = c.analyzeStack(doc, stack)
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if !ok {
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return
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}
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if !c.opts.SkipCodegen {
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// Figure out which cloud architecture we will be targeting during code-gen.
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target, arch, ok := c.discoverTargetArch(doc, stack)
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if !ok {
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return
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}
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if glog.V(2) {
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tname := "n/a"
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if target != nil {
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tname = target.Name
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}
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glog.V(2).Infof("Stack %v targets target=%v cloud=%v", stack.Name, tname, arch)
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}
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// Now get the backend cloud provider to process the stack from here on out.
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be := backends.New(arch)
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be.CodeGen(core.Compiland{c.Diag(), target, doc, stack})
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}
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}
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// loadAndParseStack takes a Mufile document, parses and validates it, and returns a stack AST. If anything goes wrong
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// during this process, the number of errors will be non-zero, and the bool will be false.
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func (c *compiler) parseStack(doc *diag.Document) (*ast.Stack, bool) {
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// To build the Mu package, first parse the input file.
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p := NewParser(c)
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stack := p.Parse(doc)
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if p.Diag().Errors() > 0 {
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// If any errors happened during parsing, exit.
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return stack, false
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}
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// Do a pass over the parse tree to ensure that all is well.
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ptAnalyzer := NewPTAnalyzer(c)
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ptAnalyzer.Analyze(doc, stack)
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if p.Diag().Errors() > 0 {
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// If any errors happened during parse tree analysis, exit.
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return stack, false
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}
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return stack, true
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}
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// discoverTargetArch uses a variety of mechanisms to discover the target architecture, returning it. If no
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// architecture was discovered, an error is issued, and the bool return will be false.
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func (c *compiler) discoverTargetArch(doc *diag.Document, stack *ast.Stack) (*ast.Target, backends.Arch, bool) {
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// Target and architectures settings may come from one of three places, in order of search preference:
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// 1) command line arguments.
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// 2) settings specific to this stack.
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// 3) cluster-wide settings in a Mucluster file.
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// In other words, 1 overrides 2 which overrides 3.
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arch := c.opts.Arch
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// If a target was specified, look it up and load up its options.
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var target *ast.Target
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if c.opts.Target != "" {
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// First, check the stack to see if it has a targets section.
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if t, exists := stack.Targets[c.opts.Target]; exists {
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target = &t
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} else {
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// If that didn't work, see if there's a clusters file we can consult.
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// TODO: support Mucluster files.
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c.Diag().Errorf(errors.CloudTargetNotFound.WithDocument(doc), c.opts.Target)
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return target, arch, false
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}
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}
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// If no target was specified or discovered yet, see if there is a default one to use.
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if target == nil {
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for _, t := range stack.Targets {
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if t.Default {
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target = &t
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break
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}
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}
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}
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if target == nil {
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// If no target was found, and we don't have an architecture, error out.
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if arch.Cloud == clouds.NoArch {
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c.Diag().Errorf(errors.MissingTarget.WithDocument(doc))
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return target, arch, false
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}
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// If we got here, generate an "anonymous" target, so that we at least have a name.
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target = c.newAnonTarget(arch)
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} else {
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// If a target was found, go ahead and extract and validate the target architecture.
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a, ok := c.getTargetArch(doc, target, arch)
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if !ok {
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return target, arch, false
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}
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arch = a
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}
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return target, arch, true
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}
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// newAnonTarget creates an anonymous target for stacks that didn't declare one.
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func (c *compiler) newAnonTarget(arch backends.Arch) *ast.Target {
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// TODO: ensure this is unique.
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// TODO: we want to cache names somewhere (~/.mu/?) so that we can reuse temporary local stacks, etc.
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return &ast.Target{
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Name: uuid.NewV4().String(),
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Cloud: clouds.Names[arch.Cloud],
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Scheduler: schedulers.Names[arch.Scheduler],
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}
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}
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// getTargetArch gets and validates the architecture from an existing target.
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func (c *compiler) getTargetArch(doc *diag.Document, target *ast.Target, existing backends.Arch) (backends.Arch, bool) {
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targetCloud := existing.Cloud
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targetScheduler := existing.Scheduler
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// If specified, look up the target's architecture settings.
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if target.Cloud != "" {
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tc, ok := clouds.Values[target.Cloud]
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if !ok {
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c.Diag().Errorf(errors.UnrecognizedCloudArch.WithDocument(doc), target.Cloud)
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return existing, false
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}
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targetCloud = tc
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}
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if target.Scheduler != "" {
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ts, ok := schedulers.Values[target.Scheduler]
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if !ok {
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c.Diag().Errorf(errors.UnrecognizedSchedulerArch.WithDocument(doc), target.Scheduler)
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return existing, false
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}
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targetScheduler = ts
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}
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// Ensure there aren't any conflicts, comparing compiler options to target settings.
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tarch := backends.Arch{targetCloud, targetScheduler}
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if targetCloud != existing.Cloud && existing.Cloud != clouds.NoArch {
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c.Diag().Errorf(errors.ConflictingTargetArchSelection.WithDocument(doc), existing, target.Name, tarch)
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return tarch, false
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}
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if targetScheduler != existing.Scheduler && existing.Scheduler != schedulers.NoArch {
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c.Diag().Errorf(errors.ConflictingTargetArchSelection.WithDocument(doc), existing, target.Name, tarch)
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return tarch, false
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}
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return tarch, true
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}
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// analyzeStack performs semantic analysis on a stack -- validating, transforming, and/or updating it -- and then
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// returns the result. If a problem occurs, errors will have been emitted, and the bool return will be false.
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func (c *compiler) analyzeStack(doc *diag.Document, stack *ast.Stack) (*ast.Stack, bool) {
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binder := NewBinder(c)
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binder.Bind(doc, stack)
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if c.Diag().Errors() > 0 {
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// If any errors happened during binding, exit.
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return stack, false
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}
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// TODO: perform semantic analysis on the bound tree.
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return stack, true
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}
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// detectMufile locates the closest Mufile-looking file from the given path, searching "upwards" in the directory
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// hierarchy. If no Mufile is found, an empty path is returned.
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func (c *compiler) detectMufile(from string) string {
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abs, err := filepath.Abs(from)
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if err != nil {
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glog.Fatalf("An IO error occurred while searching for a Mufile: %v", err)
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return ""
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}
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// It's possible the target is already the file we seek; if so, return right away.
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if c.isMufile(abs) {
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return abs
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}
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curr := abs
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for {
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stop := false
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// If the target is a directory, enumerate its files, checking each to see if it's a Mufile.
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files, err := ioutil.ReadDir(curr)
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if err != nil {
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glog.Fatalf("An IO error occurred while searching for a Mufile: %v", err)
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return ""
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}
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for _, file := range files {
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name := file.Name()
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path := filepath.Join(curr, name)
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if c.isMufile(path) {
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return path
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} else if name == workspace.Muspace {
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// If we hit a .muspace file, stop looking.
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stop = true
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}
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}
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// If we encountered a stop condition, break out of the loop.
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if stop {
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break
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}
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// If neither succeeded, keep looking in our parent directory.
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curr = filepath.Dir(curr)
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if os.IsPathSeparator(curr[len(curr)-1]) {
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break
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}
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}
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return ""
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}
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// isMufile returns true if the path references what appears to be a valid Mufile.
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func (c *compiler) isMufile(path string) bool {
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info, err := os.Stat(path)
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if err != nil {
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return false
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}
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// Directories can't be Mufiles.
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if info.IsDir() {
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return false
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}
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// Ensure the base name is expected.
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name := info.Name()
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ext := filepath.Ext(name)
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base := strings.TrimSuffix(name, ext)
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if base != workspace.MufileBase {
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if strings.EqualFold(base, workspace.MufileBase) {
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// If the strings aren't equal, but case-insensitively match, issue a warning.
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c.Diag().Warningf(errors.WarnIllegalMufileCasing.WithFile(name))
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}
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return false
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}
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// Check all supported extensions.
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for _, mufileExt := range workspace.MufileExts {
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if name == workspace.MufileBase+mufileExt {
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return true
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}
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}
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// If we got here, it means the base name matched, but not the extension. Warn and return.
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c.Diag().Warningf(errors.WarnIllegalMufileExt.WithFile(name), ext)
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return false
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}
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