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package interp
// This file provides useful types for errors encountered during IR evaluation.
import (
"errors"
"go/scanner"
"go/token"
"path/filepath"
"tinygo.org/x/go-llvm"
)
// These errors are expected during normal execution and can be recovered from
// by running the affected function at runtime instead of compile time.
var (
errIntegerAsPointer = errors.New("interp: trying to use an integer as a pointer (memory-mapped I/O?)")
errUnsupportedInst = errors.New("interp: unsupported instruction")
errUnsupportedRuntimeInst = errors.New("interp: unsupported instruction (to be emitted at runtime)")
errMapAlreadyCreated = errors.New("interp: map already created")
errLoopUnrolled = errors.New("interp: loop unrolled")
)
// This is one of the errors that can be returned from toLLVMValue when the
// passed type does not fit the data to serialize. It is recoverable by
// serializing without a type (using rawValue.rawLLVMValue).
var errInvalidPtrToIntSize = errors.New("interp: ptrtoint integer size does not equal pointer size")
func isRecoverableError(err error) bool {
return err == errIntegerAsPointer || err == errUnsupportedInst ||
err == errUnsupportedRuntimeInst || err == errMapAlreadyCreated ||
err == errLoopUnrolled
}
// ErrorLine is one line in a traceback. The position may be missing.
type ErrorLine struct {
Pos token.Position
Inst llvm.Value
}
// Error encapsulates compile-time interpretation errors with an associated
// import path. The errors may not have a precise location attached.
type Error struct {
ImportPath string
Inst llvm.Value
Pos token.Position
Err error
Traceback []ErrorLine
}
// Error returns the string of the first error in the list of errors.
func (e *Error) Error() string {
return e.Pos.String() + ": " + e.Err.Error()
}
// errorAt returns an error value for the currently interpreted package at the
// location of the instruction. The location information may not be complete as
// it depends on debug information in the IR.
func (r *runner) errorAt(inst instruction, err error) *Error {
pos := getPosition(inst.llvmInst)
return &Error{
ImportPath: r.pkgName,
Inst: inst.llvmInst,
Pos: pos,
Err: err,
Traceback: []ErrorLine{{pos, inst.llvmInst}},
}
}
// errorAt returns an error value at the location of the instruction.
// The location information may not be complete as it depends on debug
// information in the IR.
func errorAt(inst llvm.Value, msg string) scanner.Error {
return scanner.Error{
Pos: getPosition(inst),
Msg: msg,
}
}
// getPosition returns the position information for the given instruction, as
// far as it is available.
func getPosition(inst llvm.Value) token.Position {
if inst.IsAInstruction().IsNil() {
return token.Position{}
}
loc := inst.InstructionDebugLoc()
if loc.IsNil() {
return token.Position{}
}
file := loc.LocationScope().ScopeFile()
return token.Position{
Filename: filepath.Join(file.FileDirectory(), file.FileFilename()),
Line: int(loc.LocationLine()),
Column: int(loc.LocationColumn()),
}
}
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