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debug.go
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debug.go
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// Copyright 2011 The llgo Authors.
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
package llgo
import (
"debug/dwarf"
"go/token"
"code.google.com/p/go.tools/go/ssa"
"code.google.com/p/go.tools/go/types"
"github.com/axw/gollvm/llvm"
"github.com/axw/llgo/debug"
)
const (
// non-standard debug metadata tags
tagAutoVariable dwarf.Tag = 0x100
tagArgVariable dwarf.Tag = 0x101
)
type debugInfo struct {
debug.DebugInfo
debug.TypeMap
module llvm.Module
blockUid uint32
cu map[*token.File]*debug.CompileUnitDescriptor
debugContext []debug.DebugDescriptor
}
func (d *debugInfo) pushContext(dd debug.DebugDescriptor) {
d.debugContext = append(d.debugContext, dd)
}
func (d *debugInfo) popContext() (top debug.DebugDescriptor) {
n := len(d.debugContext)
top, d.debugContext = d.debugContext[n-1], d.debugContext[:n-1]
return top
}
func (d *debugInfo) context() debug.DebugDescriptor {
if len(d.debugContext) == 0 {
return nil
}
return d.debugContext[len(d.debugContext)-1]
}
func (d *debugInfo) pushBlockContext(pos token.Pos) {
uid := d.blockUid
d.blockUid++
file := d.Fset.File(pos)
d.pushContext(&debug.BlockDescriptor{
File: &d.getCompileUnit(file).Path,
Line: uint32(file.Line(pos)),
Context: d.context(),
Id: uid,
})
}
func (d *debugInfo) popBlockContext() {
d.popContext()
}
func (d *debugInfo) getCompileUnit(file *token.File) *debug.CompileUnitDescriptor {
if d.cu == nil {
d.cu = make(map[*token.File]*debug.CompileUnitDescriptor)
}
cu := d.cu[file]
if cu == nil {
var path string
if file != nil {
path = d.Fset.File(file.Pos(0)).Name()
}
cu = &debug.CompileUnitDescriptor{
Language: debug.DW_LANG_Go,
Path: debug.FileDescriptor(path),
Producer: "llgo",
Runtime: LLGORuntimeVersion,
}
d.cu[file] = cu
}
return cu
}
func (d *debugInfo) pushFunctionContext(fnptr llvm.Value, sig *types.Signature, pos token.Pos) {
subprog := &debug.SubprogramDescriptor{
Name: fnptr.Name(),
DisplayName: fnptr.Name(),
Function: fnptr,
}
file := d.Fset.File(pos)
cu := d.getCompileUnit(file)
subprog.File = file.Name()
subprog.Context = &cu.Path
if file != nil {
subprog.Line = uint32(file.Line(pos))
subprog.ScopeLine = uint32(file.Line(pos)) // TODO(axw)
}
sigType := d.TypeDebugDescriptor(sig).(*debug.CompositeTypeDescriptor)
subroutineType := sigType.Members[0]
subprog.Type = subroutineType
cu.Subprograms = append(cu.Subprograms, subprog)
d.pushContext(subprog)
}
func (d *debugInfo) popFunctionContext() {
d.popContext()
}
// declare creates an llvm.dbg.declare call for the specified function
// parameter or local variable.
func (d *debugInfo) declare(b llvm.Builder, v ssa.Value, llv llvm.Value, paramIndex int) {
tag := tagAutoVariable
if paramIndex >= 0 {
tag = tagArgVariable
}
ld := debug.NewLocalVariableDescriptor(tag)
ld.Argument = uint32(paramIndex + 1)
ld.Name = llv.Name()
if file := d.Fset.File(v.Pos()); file != nil {
ld.Line = uint32(file.Position(v.Pos()).Line)
ld.File = &d.getCompileUnit(file).Path
}
ld.Type = d.TypeDebugDescriptor(deref(v.Type()))
ld.Context = d.context()
b.InsertDeclare(d.module, llvm.MDNode([]llvm.Value{llv}), d.MDNode(ld))
}
// value creates an llvm.dbg.value call for the specified register value.
func (d *debugInfo) value(b llvm.Builder, v ssa.Value, llv llvm.Value, paramIndex int) {
// TODO(axw)
}
func (d *debugInfo) setLocation(b llvm.Builder, pos token.Pos) {
position := d.Fset.Position(pos)
b.SetCurrentDebugLocation(llvm.MDNode([]llvm.Value{
llvm.ConstInt(llvm.Int32Type(), uint64(position.Line), true),
llvm.ConstInt(llvm.Int32Type(), uint64(position.Column), true),
d.MDNode(d.context()),
llvm.Value{},
}))
}