642 lines
23 KiB
Rust
642 lines
23 KiB
Rust
use crate::address_transform::AddressTransform;
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use crate::gc::build_dependencies;
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pub use crate::read_debuginfo::DebugInfoData;
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use cranelift_codegen::ir;
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use cranelift_codegen::isa::TargetFrontendConfig;
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use cranelift_entity::{EntityRef, PrimaryMap};
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use cranelift_wasm::DefinedFuncIndex;
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use failure::Error;
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use std::collections::{BTreeMap, HashMap, HashSet};
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use std::iter::FromIterator;
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use wasmtime_environ::ModuleAddressMap;
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use gimli;
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use gimli::{
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AttributeValue, DebugAddr, DebugAddrBase, DebugLine, DebugLineOffset, DebugStr,
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DebuggingInformationEntry, LineEncoding, LocationLists, RangeLists, Unit, UnitOffset,
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UnitSectionOffset,
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};
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use gimli::write;
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trait Reader: gimli::Reader<Offset = usize> {}
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impl<'input, Endian> Reader for gimli::EndianSlice<'input, Endian> where Endian: gimli::Endianity {}
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#[derive(Fail, Debug)]
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#[fail(display = "Debug info transform error: {}", _0)]
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pub struct TransformError(&'static str);
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/// Module `vmctx` related info.
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pub struct ModuleVmctxInfo {
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pub memory_offset: i64,
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pub stack_slots: PrimaryMap<DefinedFuncIndex, ir::StackSlots>,
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}
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/// Value ranges for functions.
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pub type ValueLabelsRanges = PrimaryMap<DefinedFuncIndex, cranelift_codegen::ValueLabelsRanges>;
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struct DebugInputContext<'a, R>
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where
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R: Reader,
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{
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debug_str: &'a DebugStr<R>,
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debug_line: &'a DebugLine<R>,
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debug_addr: &'a DebugAddr<R>,
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debug_addr_base: DebugAddrBase<R::Offset>,
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rnglists: &'a RangeLists<R>,
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loclists: &'a LocationLists<R>,
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reachable: HashSet<UnitSectionOffset>,
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}
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type PendingDieRef = (write::UnitEntryId, gimli::DwAt, UnitOffset);
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enum FileAttributeContext<'a> {
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Root(Option<DebugLineOffset>),
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Children(&'a Vec<write::FileId>),
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}
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fn clone_die_attributes<'a, R>(
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entry: &DebuggingInformationEntry<R>,
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context: &DebugInputContext<R>,
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addr_tr: &'a AddressTransform,
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unit_encoding: &gimli::Encoding,
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current_scope: &mut write::DebuggingInformationEntry,
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current_scope_id: write::UnitEntryId,
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subprogram_range: Option<(write::Address, u64)>,
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out_strings: &mut write::StringTable,
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die_ref_map: &HashMap<UnitOffset, write::UnitEntryId>,
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pending_die_refs: &mut Vec<PendingDieRef>,
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file_context: FileAttributeContext<'a>,
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) -> Result<(), Error>
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where
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R: Reader,
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{
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let _tag = &entry.tag();
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let mut attrs = entry.attrs();
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let mut low_pc = None;
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while let Some(attr) = attrs.next()? {
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let attr_value = match attr.value() {
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AttributeValue::Addr(_)
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if attr.name() == gimli::DW_AT_low_pc && subprogram_range.is_some() =>
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{
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write::AttributeValue::Address(subprogram_range.unwrap().0)
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}
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AttributeValue::Udata(_)
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if attr.name() == gimli::DW_AT_high_pc && subprogram_range.is_some() =>
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{
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write::AttributeValue::Udata(subprogram_range.unwrap().1)
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}
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AttributeValue::Addr(u) => {
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let addr = addr_tr.translate(u).unwrap_or(write::Address::Constant(0));
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if attr.name() == gimli::DW_AT_low_pc {
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low_pc = Some((u, addr));
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}
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write::AttributeValue::Address(addr)
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}
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AttributeValue::Udata(u) => {
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if attr.name() != gimli::DW_AT_high_pc || low_pc.is_none() {
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write::AttributeValue::Udata(u)
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} else {
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let u = addr_tr.delta(low_pc.unwrap().0, u).unwrap_or(0);
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write::AttributeValue::Udata(u)
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}
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}
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AttributeValue::Data1(d) => write::AttributeValue::Data1(d),
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AttributeValue::Data2(d) => write::AttributeValue::Data2(d),
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AttributeValue::Data4(d) => write::AttributeValue::Data4(d),
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AttributeValue::Sdata(d) => write::AttributeValue::Sdata(d),
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AttributeValue::Flag(f) => write::AttributeValue::Flag(f),
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AttributeValue::DebugLineRef(line_program_offset) => {
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if let FileAttributeContext::Root(o) = file_context {
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if o != Some(line_program_offset) {
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return Err(TransformError("invalid debug_line offset").into());
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}
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write::AttributeValue::LineProgramRef
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} else {
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return Err(TransformError("unexpected debug_line index attribute").into());
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}
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}
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AttributeValue::FileIndex(i) => {
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if let FileAttributeContext::Children(file_map) = file_context {
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write::AttributeValue::FileIndex(Some(file_map[(i - 1) as usize]))
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} else {
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return Err(TransformError("unexpected file index attribute").into());
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}
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}
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AttributeValue::DebugStrRef(str_offset) => {
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let s = context.debug_str.get_str(str_offset)?.to_slice()?.to_vec();
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write::AttributeValue::StringRef(out_strings.add(s))
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}
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AttributeValue::RangeListsRef(r) => {
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let low_pc = 0;
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let mut ranges = context.rnglists.ranges(
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r,
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*unit_encoding,
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low_pc,
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&context.debug_addr,
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context.debug_addr_base,
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)?;
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let mut _result = Vec::new();
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while let Some(range) = ranges.next()? {
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assert!(range.begin <= range.end);
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_result.push((range.begin as i64, range.end as i64));
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}
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// FIXME _result contains invalid code offsets; translate_address
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continue; // ignore attribute
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}
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AttributeValue::LocationListsRef(r) => {
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let low_pc = 0;
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let mut locs = context.loclists.locations(
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r,
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*unit_encoding,
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low_pc,
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&context.debug_addr,
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context.debug_addr_base,
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)?;
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let mut _result = Vec::new();
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while let Some(loc) = locs.next()? {
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_result.push((loc.range.begin as i64, loc.range.end as i64, loc.data.0));
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}
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// FIXME _result contains invalid expressions and code offsets
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continue; // ignore attribute
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}
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AttributeValue::Exprloc(ref _expr) => {
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// FIXME _expr contains invalid expression
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continue; // ignore attribute
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}
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AttributeValue::Encoding(e) => write::AttributeValue::Encoding(e),
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AttributeValue::DecimalSign(e) => write::AttributeValue::DecimalSign(e),
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AttributeValue::Endianity(e) => write::AttributeValue::Endianity(e),
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AttributeValue::Accessibility(e) => write::AttributeValue::Accessibility(e),
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AttributeValue::Visibility(e) => write::AttributeValue::Visibility(e),
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AttributeValue::Virtuality(e) => write::AttributeValue::Virtuality(e),
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AttributeValue::Language(e) => write::AttributeValue::Language(e),
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AttributeValue::AddressClass(e) => write::AttributeValue::AddressClass(e),
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AttributeValue::IdentifierCase(e) => write::AttributeValue::IdentifierCase(e),
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AttributeValue::CallingConvention(e) => write::AttributeValue::CallingConvention(e),
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AttributeValue::Inline(e) => write::AttributeValue::Inline(e),
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AttributeValue::Ordering(e) => write::AttributeValue::Ordering(e),
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AttributeValue::UnitRef(ref offset) => {
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if let Some(unit_id) = die_ref_map.get(offset) {
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write::AttributeValue::ThisUnitEntryRef(*unit_id)
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} else {
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pending_die_refs.push((current_scope_id, attr.name(), *offset));
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continue;
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}
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}
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// AttributeValue::DebugInfoRef(_) => {
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// continue;
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// }
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_ => panic!(), //write::AttributeValue::StringRef(out_strings.add("_")),
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};
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current_scope.set(attr.name(), attr_value);
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}
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Ok(())
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}
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fn clone_attr_string<R>(
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attr_value: &AttributeValue<R>,
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form: gimli::DwForm,
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debug_str: &DebugStr<R>,
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out_strings: &mut write::StringTable,
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) -> Result<write::LineString, gimli::Error>
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where
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R: Reader,
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{
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let content = match attr_value {
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AttributeValue::DebugStrRef(str_offset) => {
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debug_str.get_str(*str_offset)?.to_slice()?.to_vec()
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}
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AttributeValue::String(b) => b.to_slice()?.to_vec(),
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_ => panic!("Unexpected attribute value"),
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};
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Ok(match form {
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gimli::DW_FORM_strp => {
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let id = out_strings.add(content);
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write::LineString::StringRef(id)
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}
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gimli::DW_FORM_string => write::LineString::String(content),
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_ => panic!("DW_FORM_line_strp or other not supported"),
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})
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}
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#[derive(Debug)]
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enum SavedLineProgramRow {
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Normal {
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address: u64,
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op_index: u64,
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file_index: u64,
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line: u64,
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column: u64,
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discriminator: u64,
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is_stmt: bool,
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basic_block: bool,
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prologue_end: bool,
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epilogue_begin: bool,
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isa: u64,
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},
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EndOfSequence(u64),
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}
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#[derive(Debug, Eq, PartialEq)]
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enum ReadLineProgramState {
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SequenceEnded,
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ReadSequence,
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IgnoreSequence,
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}
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fn clone_line_program<R>(
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unit: &Unit<R, R::Offset>,
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root: &DebuggingInformationEntry<R>,
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addr_tr: &AddressTransform,
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out_encoding: &gimli::Encoding,
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debug_str: &DebugStr<R>,
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debug_line: &DebugLine<R>,
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out_strings: &mut write::StringTable,
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) -> Result<(write::LineProgram, DebugLineOffset, Vec<write::FileId>), Error>
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where
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R: Reader,
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{
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let offset = match root.attr_value(gimli::DW_AT_stmt_list)? {
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Some(gimli::AttributeValue::DebugLineRef(offset)) => offset,
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_ => {
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return Err(TransformError("Debug line offset is not found").into());
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}
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};
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let comp_dir = root.attr_value(gimli::DW_AT_comp_dir)?;
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let comp_name = root.attr_value(gimli::DW_AT_name)?;
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let out_comp_dir = clone_attr_string(
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comp_dir.as_ref().expect("comp_dir"),
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gimli::DW_FORM_strp,
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debug_str,
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out_strings,
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)?;
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let out_comp_name = clone_attr_string(
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comp_name.as_ref().expect("comp_name"),
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gimli::DW_FORM_strp,
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debug_str,
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out_strings,
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)?;
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let program = debug_line.program(
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offset,
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unit.header.address_size(),
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comp_dir.and_then(|val| val.string_value(&debug_str)),
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comp_name.and_then(|val| val.string_value(&debug_str)),
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);
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if let Ok(program) = program {
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let header = program.header();
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assert!(header.version() <= 4, "not supported 5");
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let line_encoding = LineEncoding {
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minimum_instruction_length: header.minimum_instruction_length(),
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maximum_operations_per_instruction: header.maximum_operations_per_instruction(),
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default_is_stmt: header.default_is_stmt(),
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line_base: header.line_base(),
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line_range: header.line_range(),
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};
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let mut out_program = write::LineProgram::new(
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*out_encoding,
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line_encoding,
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out_comp_dir,
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out_comp_name,
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None,
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);
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let mut dirs = Vec::new();
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dirs.push(out_program.default_directory());
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for dir_attr in header.include_directories() {
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let dir_id = out_program.add_directory(clone_attr_string(
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dir_attr,
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gimli::DW_FORM_string,
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debug_str,
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out_strings,
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)?);
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dirs.push(dir_id);
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}
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let mut files = Vec::new();
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for file_entry in header.file_names() {
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let dir_id = dirs[file_entry.directory_index() as usize];
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let file_id = out_program.add_file(
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clone_attr_string(
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&file_entry.path_name(),
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gimli::DW_FORM_string,
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debug_str,
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out_strings,
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)?,
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dir_id,
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None,
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);
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files.push(file_id);
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}
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let mut rows = program.rows();
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let mut saved_rows = BTreeMap::new();
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let mut state = ReadLineProgramState::SequenceEnded;
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while let Some((_header, row)) = rows.next_row()? {
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if state == ReadLineProgramState::IgnoreSequence {
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if row.end_sequence() {
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state = ReadLineProgramState::SequenceEnded;
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}
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continue;
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}
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let saved_row = if row.end_sequence() {
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state = ReadLineProgramState::SequenceEnded;
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SavedLineProgramRow::EndOfSequence(row.address())
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} else {
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if state == ReadLineProgramState::SequenceEnded {
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// Discard sequences for non-existent code.
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if row.address() == 0 {
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state = ReadLineProgramState::IgnoreSequence;
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continue;
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}
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state = ReadLineProgramState::ReadSequence;
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}
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SavedLineProgramRow::Normal {
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address: row.address(),
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op_index: row.op_index(),
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file_index: row.file_index(),
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line: row.line().unwrap_or(0),
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column: match row.column() {
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gimli::ColumnType::LeftEdge => 0,
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gimli::ColumnType::Column(val) => val,
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},
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discriminator: row.discriminator(),
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is_stmt: row.is_stmt(),
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basic_block: row.basic_block(),
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prologue_end: row.prologue_end(),
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epilogue_begin: row.epilogue_begin(),
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isa: row.isa(),
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}
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};
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saved_rows.insert(row.address(), saved_row);
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}
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let saved_rows = Vec::from_iter(saved_rows.into_iter());
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for (i, map) in addr_tr.map() {
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let symbol = i.index();
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let base_addr = map.offset;
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out_program.begin_sequence(Some(write::Address::Symbol { symbol, addend: 0 }));
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// TODO track and place function declaration line here
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let mut last_address = None;
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for addr_map in map.addresses.iter() {
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let saved_row =
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match saved_rows.binary_search_by(|entry| entry.0.cmp(&addr_map.wasm)) {
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Ok(i) => Some(&saved_rows[i].1),
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Err(i) => {
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if i > 0 {
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Some(&saved_rows[i - 1].1)
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} else {
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None
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}
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}
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};
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if let Some(SavedLineProgramRow::Normal {
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address,
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op_index,
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file_index,
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line,
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column,
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discriminator,
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is_stmt,
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basic_block,
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prologue_end,
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epilogue_begin,
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isa,
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}) = saved_row
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{
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// Ignore duplicates
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if Some(*address) != last_address {
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let address_offset = if last_address.is_none() {
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// Extend first entry to the function declaration
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// TODO use the function declaration line instead
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0
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} else {
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(addr_map.generated - base_addr) as u64
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};
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out_program.row().address_offset = address_offset;
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out_program.row().op_index = *op_index;
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out_program.row().file = files[(file_index - 1) as usize];
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out_program.row().line = *line;
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out_program.row().column = *column;
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out_program.row().discriminator = *discriminator;
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out_program.row().is_statement = *is_stmt;
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out_program.row().basic_block = *basic_block;
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out_program.row().prologue_end = *prologue_end;
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out_program.row().epilogue_begin = *epilogue_begin;
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out_program.row().isa = *isa;
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out_program.generate_row();
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last_address = Some(*address);
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}
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}
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}
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let end_addr = (map.offset + map.len - 1) as u64;
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out_program.end_sequence(end_addr);
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}
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Ok((out_program, offset, files))
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} else {
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Err(TransformError("Valid line program not found").into())
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}
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}
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|
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fn get_subprogram_range<'a, R>(
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entry: &DebuggingInformationEntry<R>,
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addr_tr: &'a AddressTransform,
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) -> Result<Option<(write::Address, u64)>, Error>
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where
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R: Reader,
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{
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let low_pc = entry.attr_value(gimli::DW_AT_low_pc)?;
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if let Some(AttributeValue::Addr(addr)) = low_pc {
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let transformed = addr_tr.translate(addr);
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if let Some(write::Address::Symbol { symbol, .. }) = transformed {
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let range = addr_tr.func_range(symbol);
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let addr = write::Address::Symbol {
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symbol,
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addend: range.0 as i64,
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};
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let len = (range.1 - range.0) as u64;
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return Ok(Some((addr, len)));
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}
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}
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Ok(None)
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}
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|
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fn clone_unit<'a, R>(
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unit: Unit<R, R::Offset>,
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context: &DebugInputContext<R>,
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addr_tr: &'a AddressTransform,
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out_encoding: &gimli::Encoding,
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out_units: &mut write::UnitTable,
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out_strings: &mut write::StringTable,
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) -> Result<(), Error>
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|
where
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R: Reader,
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{
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let mut die_ref_map = HashMap::new();
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let mut pending_die_refs = Vec::new();
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let mut stack = Vec::new();
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|
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// Iterate over all of this compilation unit's entries.
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let mut entries = unit.entries();
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let (comp_unit, file_map) = if let Some((depth_delta, entry)) = entries.next_dfs()? {
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assert!(depth_delta == 0);
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let (out_line_program, debug_line_offset, file_map) = clone_line_program(
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&unit,
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entry,
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addr_tr,
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out_encoding,
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|
context.debug_str,
|
|
context.debug_line,
|
|
out_strings,
|
|
)?;
|
|
|
|
if entry.tag() == gimli::DW_TAG_compile_unit {
|
|
let unit_id = out_units.add(write::Unit::new(*out_encoding, out_line_program));
|
|
let comp_unit = out_units.get_mut(unit_id);
|
|
|
|
let root_id = comp_unit.root();
|
|
die_ref_map.insert(entry.offset(), root_id);
|
|
|
|
clone_die_attributes(
|
|
entry,
|
|
context,
|
|
addr_tr,
|
|
&unit.encoding(),
|
|
comp_unit.get_mut(root_id),
|
|
root_id,
|
|
None,
|
|
out_strings,
|
|
&die_ref_map,
|
|
&mut pending_die_refs,
|
|
FileAttributeContext::Root(Some(debug_line_offset)),
|
|
)?;
|
|
|
|
stack.push(root_id);
|
|
(comp_unit, file_map)
|
|
} else {
|
|
return Err(TransformError("Unexpected unit header").into());
|
|
}
|
|
} else {
|
|
return Ok(()); // empty
|
|
};
|
|
let mut skip_at_depth = None;
|
|
while let Some((depth_delta, entry)) = entries.next_dfs()? {
|
|
let depth_delta = if let Some((depth, cached)) = skip_at_depth {
|
|
let new_depth = depth + depth_delta;
|
|
if new_depth > 0 {
|
|
skip_at_depth = Some((new_depth, cached));
|
|
continue;
|
|
}
|
|
skip_at_depth = None;
|
|
new_depth + cached
|
|
} else {
|
|
depth_delta
|
|
};
|
|
if !context
|
|
.reachable
|
|
.contains(&entry.offset().to_unit_section_offset(&unit))
|
|
{
|
|
// entry is not reachable: discarding all its info.
|
|
skip_at_depth = Some((0, depth_delta));
|
|
continue;
|
|
}
|
|
|
|
let range = if entry.tag() == gimli::DW_TAG_subprogram {
|
|
get_subprogram_range(entry, addr_tr)?
|
|
} else {
|
|
None
|
|
};
|
|
|
|
if depth_delta <= 0 {
|
|
for _ in depth_delta..1 {
|
|
stack.pop();
|
|
}
|
|
} else {
|
|
assert!(depth_delta == 1);
|
|
}
|
|
let parent = stack.last().unwrap();
|
|
let die_id = comp_unit.add(*parent, entry.tag());
|
|
let current_scope = comp_unit.get_mut(die_id);
|
|
|
|
stack.push(die_id);
|
|
die_ref_map.insert(entry.offset(), die_id);
|
|
|
|
clone_die_attributes(
|
|
entry,
|
|
context,
|
|
addr_tr,
|
|
&unit.encoding(),
|
|
current_scope,
|
|
die_id,
|
|
range,
|
|
out_strings,
|
|
&die_ref_map,
|
|
&mut pending_die_refs,
|
|
FileAttributeContext::Children(&file_map),
|
|
)?;
|
|
}
|
|
for (die_id, attr_name, offset) in pending_die_refs {
|
|
let die = comp_unit.get_mut(die_id);
|
|
// TODO we probably loosing DW_AT_abstract_origin and DW_AT_type references
|
|
// here, find out if we drop stuff we don't need to.
|
|
if let Some(unit_id) = die_ref_map.get(&offset) {
|
|
die.set(attr_name, write::AttributeValue::ThisUnitEntryRef(*unit_id));
|
|
}
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn transform_dwarf(
|
|
target_config: &TargetFrontendConfig,
|
|
di: &DebugInfoData,
|
|
at: &ModuleAddressMap,
|
|
) -> Result<write::Dwarf, Error> {
|
|
let addr_tr = AddressTransform::new(at, &di.wasm_file);
|
|
let reachable = build_dependencies(&di.dwarf, &addr_tr)?.get_reachable();
|
|
|
|
let context = DebugInputContext {
|
|
debug_str: &di.dwarf.debug_str,
|
|
debug_line: &di.dwarf.debug_line,
|
|
debug_addr: &di.dwarf.debug_addr,
|
|
debug_addr_base: DebugAddrBase(0),
|
|
rnglists: &di.dwarf.ranges,
|
|
loclists: &di.dwarf.locations,
|
|
reachable,
|
|
};
|
|
|
|
let out_encoding = gimli::Encoding {
|
|
format: gimli::Format::Dwarf32,
|
|
// TODO: this should be configurable
|
|
// macOS doesn't seem to support DWARF > 3
|
|
version: 3,
|
|
address_size: target_config.pointer_bytes(),
|
|
};
|
|
|
|
let mut out_strings = write::StringTable::default();
|
|
let mut out_units = write::UnitTable::default();
|
|
|
|
let out_line_strings = write::LineStringTable::default();
|
|
|
|
let mut iter = di.dwarf.debug_info.units();
|
|
while let Some(unit) = iter.next().unwrap_or(None) {
|
|
let unit = di.dwarf.unit(unit)?;
|
|
clone_unit(
|
|
unit,
|
|
&context,
|
|
&addr_tr,
|
|
&out_encoding,
|
|
&mut out_units,
|
|
&mut out_strings,
|
|
)?;
|
|
}
|
|
|
|
Ok(write::Dwarf {
|
|
units: out_units,
|
|
line_programs: vec![],
|
|
line_strings: out_line_strings,
|
|
strings: out_strings,
|
|
})
|
|
}
|