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
}
