func (c *compiler) createFunctionMetadata(f *ast.FuncDecl, fn *LLVMValue) llvm.DebugDescriptor {
if len(c.debug_context) == 0 {
return nil
}
file := c.fileset.File(f.Pos())
fnptr := fn.value
fun := fnptr.IsAFunction()
if fun.IsNil() {
fnptr = llvm.ConstExtractValue(fn.value, []uint32{0})
}
meta := &llvm.SubprogramDescriptor{
Name: fnptr.Name(),
DisplayName: f.Name.Name,
Path: llvm.FileDescriptor(file.Name()),
Line: uint32(file.Line(f.Pos())),
ScopeLine: uint32(file.Line(f.Body.Pos())),
Context: &llvm.ContextDescriptor{llvm.FileDescriptor(file.Name())},
Function: fnptr}
var result types.Type
var metaparams []llvm.DebugDescriptor
if ftyp, ok := fn.Type().(*types.Signature); ok {
if recv := ftyp.Recv(); recv != nil {
metaparams = append(metaparams, c.tollvmDebugDescriptor(recv.Type()))
}
if ftyp.Params() != nil {
for i := 0; i < ftyp.Params().Len(); i++ {
p := ftyp.Params().At(i)
metaparams = append(metaparams, c.tollvmDebugDescriptor(p.Type()))
}
}
if ftyp.Results() != nil {
result = ftyp.Results().At(0).Type()
// TODO: what to do with multiple returns?
for i := 1; i < ftyp.Results().Len(); i++ {
p := ftyp.Results().At(i)
metaparams = append(metaparams, c.tollvmDebugDescriptor(p.Type()))
}
}
}
meta.Type = llvm.NewSubroutineCompositeType(
c.tollvmDebugDescriptor(result),
metaparams,
)
// compile unit is the first context object pushed
compileUnit := c.debug_context[0].(*llvm.CompileUnitDescriptor)
compileUnit.Subprograms = append(compileUnit.Subprograms, meta)
return meta
}
func (c *compiler) createBlockMetadata(stmt *ast.BlockStmt) llvm.DebugDescriptor {
uniqueId++
file := c.fileset.File(stmt.Pos())
fd := llvm.FileDescriptor(file.Name())
return &llvm.BlockDescriptor{
File: &fd,
Line: uint32(file.Line(stmt.Pos())),
Context: c.currentDebugContext(),
Id: uniqueId,
}
}
func (c *compiler) newStackVarEx(argument int, stackf *LLVMValue, v types.Object, value llvm.Value, name string) (stackvalue llvm.Value, stackvar *LLVMValue) {
typ := v.Type()
// We need to put alloca instructions in the top block or the values
// displayed when inspecting these variables in a debugger will be
// completely messed up.
curBlock := c.builder.GetInsertBlock()
if p := curBlock.Parent(); !p.IsNil() {
fb := p.FirstBasicBlock()
fi := fb.FirstInstruction()
if !fb.IsNil() && !fi.IsNil() {
c.builder.SetInsertPointBefore(fi)
}
}
old := c.builder.CurrentDebugLocation()
c.builder.SetCurrentDebugLocation(llvm.Value{})
stackvalue = c.builder.CreateAlloca(c.types.ToLLVM(typ), name)
// For arguments we want to insert the store instruction
// without debug information to ensure that they are executed
// (and hence have proper values) before the debugger hits the
// first line in a function.
if argument == 0 {
c.builder.SetCurrentDebugLocation(old)
c.builder.SetInsertPointAtEnd(curBlock)
}
if !value.IsNil() {
c.builder.CreateStore(value, stackvalue)
}
c.builder.SetCurrentDebugLocation(old)
c.builder.SetInsertPointAtEnd(curBlock)
ptrvalue := c.NewValue(stackvalue, types.NewPointer(typ))
stackvar = ptrvalue.makePointee()
stackvar.stack = stackf
c.objectdata[v].Value = stackvar
file := c.fileset.File(v.Pos())
tag := llvm.DW_TAG_auto_variable
if argument > 0 {
tag = llvm.DW_TAG_arg_variable
}
ld := llvm.NewLocalVariableDescriptor(tag)
ld.Argument = uint32(argument)
ld.Line = uint32(file.Line(v.Pos()))
ld.Name = name
ld.File = &llvm.ContextDescriptor{llvm.FileDescriptor(file.Name())}
ld.Type = c.tollvmDebugDescriptor(typ)
ld.Context = c.currentDebugContext()
c.builder.InsertDeclare(c.module.Module, llvm.MDNode([]llvm.Value{stackvalue}), c.debug_info.MDNode(ld))
return stackvalue, stackvar
}
// createLocalVariableMetadata creates and returns a debug descriptor for
// a local variable in a function.
//
// obj is the go/types object for the var.
// paramIndex is 0 for "auto" variables (non-parameter stack vars), and a
// 1-based index for parameter vars.
func (c *compiler) createLocalVariableMetadata(obj types.Object, paramIndex int) llvm.DebugDescriptor {
ctx := c.currentDebugContext()
if ctx == nil {
return nil
}
tag := llvm.DW_TAG_auto_variable
if paramIndex > 0 {
tag = llvm.DW_TAG_arg_variable
}
position := c.fileset.Position(obj.Pos())
ld := llvm.NewLocalVariableDescriptor(tag)
ld.Argument = uint32(paramIndex)
ld.Line = uint32(position.Line)
ld.Name = obj.Name()
ld.File = &llvm.ContextDescriptor{llvm.FileDescriptor(position.Filename)}
ld.Type = c.tollvmDebugDescriptor(obj.Type())
ld.Context = ctx
return ld
}
func (compiler *compiler) Compile(fset *token.FileSet, files []*ast.File, importpath string) (m *Module, err error) {
// FIXME create a compilation state, rather than storing in 'compiler'.
compiler.fileset = fset
compiler.initfuncs = nil
compiler.varinitfuncs = nil
// If no import path is specified, or the package's
// name (not path) is "main", then set the import
// path to be the same as the package's name.
if importpath == "" || files[0].Name.String() == "main" {
importpath = files[0].Name.String()
}
// Type-check, and store object data.
compiler.typeinfo.Types = make(map[ast.Expr]types.Type)
compiler.typeinfo.Values = make(map[ast.Expr]exact.Value)
compiler.typeinfo.Objects = make(map[*ast.Ident]types.Object)
compiler.typeinfo.Implicits = make(map[ast.Node]types.Object)
compiler.typeinfo.Selections = make(map[*ast.SelectorExpr]*types.Selection)
compiler.objectdata = make(map[types.Object]*ObjectData)
compiler.methodsets = make(map[types.Type]*methodset)
compiler.exportedtypes = nil
compiler.llvmtypes = NewLLVMTypeMap(compiler.target)
pkg, err := compiler.typecheck(importpath, fset, files)
if err != nil {
return nil, err
}
compiler.pkg = pkg
// Create a Module, which contains the LLVM bitcode. Dispose it on panic,
// otherwise we'll set a finalizer at the end. The caller may invoke
// Dispose manually, which will render the finalizer a no-op.
modulename := importpath
compiler.module = &Module{llvm.NewModule(modulename), modulename, false}
compiler.module.SetTarget(compiler.TargetTriple)
compiler.module.SetDataLayout(compiler.target.String())
defer func() {
if e := recover(); e != nil {
compiler.module.Dispose()
panic(e)
}
}()
// Create a struct responsible for mapping static types to LLVM types,
// and to runtime/dynamic type values.
var resolver Resolver = compiler
compiler.FunctionCache = NewFunctionCache(compiler)
compiler.types = NewTypeMap(compiler.llvmtypes, compiler.module.Module, importpath, compiler.FunctionCache, resolver)
// Create a Builder, for building LLVM instructions.
compiler.builder = newBuilder(compiler.types)
defer compiler.builder.Dispose()
compiler.debug_info = &llvm.DebugInfo{}
// Compile each file in the package.
for _, file := range files {
compiler.compile_unit = &llvm.CompileUnitDescriptor{
Language: llvm.DW_LANG_Go,
Path: llvm.FileDescriptor(fset.File(file.Pos()).Name()),
Producer: LLGOProducer,
Runtime: LLGORuntimeVersion,
}
compiler.pushDebugContext(&compiler.compile_unit.Path)
for _, decl := range file.Decls {
compiler.VisitDecl(decl)
}
compiler.popDebugContext()
if len(compiler.debug_context) > 0 {
log.Panicln(compiler.debug_context)
}
compiler.module.AddNamedMetadataOperand("llvm.dbg.cu", compiler.debug_info.MDNode(compiler.compile_unit))
}
// Export runtime type information.
compiler.exportRuntimeTypes()
// Wrap "main.main" in a call to runtime.main.
if importpath == "main" {
err = compiler.createMainFunction()
if err != nil {
return nil, err
}
} else {
var e = exporter{compiler: compiler}
if err := e.Export(pkg); err != nil {
return nil, err
}
}
// Create global constructors. The initfuncs/varinitfuncs
// slices are in the order of visitation; we generate the
// list of constructors in the reverse order.
//
// The llgo linker will link modules in the order of
// package dependency, i.e. if A requires B, then llgo-link
// will link the modules in the order A, B. The "runtime"
// package is always last.
//
// At program initialisation, the runtime initialisation
// function (runtime.main) will invoke the constructors
// in reverse order.
var initfuncs [][]llvm.Value
if compiler.varinitfuncs != nil {
initfuncs = append(initfuncs, compiler.varinitfuncs)
}
if compiler.initfuncs != nil {
initfuncs = append(initfuncs, compiler.initfuncs)
}
if initfuncs != nil {
ctortype := llvm.PointerType(llvm.Int8Type(), 0)
var ctors []llvm.Value
var index int = 0
for _, initfuncs := range initfuncs {
for _, fnptr := range initfuncs {
name := fmt.Sprintf("__llgo.ctor.%s.%d", importpath, index)
fnptr.SetName(name)
fnptr = llvm.ConstBitCast(fnptr, ctortype)
ctors = append(ctors, fnptr)
index++
}
}
for i, n := 0, len(ctors); i < n/2; i++ {
ctors[i], ctors[n-i-1] = ctors[n-i-1], ctors[i]
}
ctorsInit := llvm.ConstArray(ctortype, ctors)
ctorsVar := llvm.AddGlobal(compiler.module.Module, ctorsInit.Type(), "runtime.ctors")
ctorsVar.SetInitializer(ctorsInit)
ctorsVar.SetLinkage(llvm.AppendingLinkage)
}
// Create debug metadata.
//compiler.createMetadata()
return compiler.module, nil
}