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| author | bors <bors@rust-lang.org> | 2020-12-16 12:51:42 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2020-12-16 12:51:42 +0000 |
| commit | 2ba7ca2bbbff6cd424aebc654308febc00b9497a (patch) | |
| tree | 231959b03519aadce7c2e68becd08d620cad790e /compiler/rustc_interface/src | |
| parent | 268cbfeb88b4c13425d47910d3424c85b4c96462 (diff) | |
| parent | ee073b5ec54a13b393071298acc54e1fd28cfcdf (diff) | |
| download | rust-2ba7ca2bbbff6cd424aebc654308febc00b9497a.tar.gz rust-2ba7ca2bbbff6cd424aebc654308febc00b9497a.zip | |
Auto merge of #77117 - davidtwco:issue-34651-split-dwarf, r=nagisa
cg_llvm: split dwarf support
cc #34651
This PR adds initial support for Split DWARF to rustc, based on the implementation in Clang.
##### Current Status
This PR currently has functioning split-dwarf, running rustc with `-Zsplit-dwarf=split` when compiling a binary will produce a `dwp` alongside the binary, which contains the linked dwarf objects.
```shell-session
$ rustc -Cdebuginfo=2 -Zsplit-dwarf=split -C save-temps ./foo.rs
$ ls foo*
foo
foo.belfx9afw9cmv8.rcgu.dwo
foo.belfx9afw9cmv8.rcgu.o
foo.foo.7rcbfp3g-cgu.0.rcgu.dwo
foo.foo.7rcbfp3g-cgu.0.rcgu.o
foo.foo.7rcbfp3g-cgu.1.rcgu.dwo
foo.foo.7rcbfp3g-cgu.1.rcgu.o
foo.foo.7rcbfp3g-cgu.2.rcgu.dwo
foo.foo.7rcbfp3g-cgu.2.rcgu.o
foo.foo.7rcbfp3g-cgu.3.rcgu.dwo
foo.foo.7rcbfp3g-cgu.3.rcgu.o
foo.foo.7rcbfp3g-cgu.4.rcgu.dwo
foo.foo.7rcbfp3g-cgu.4.rcgu.o
foo.foo.7rcbfp3g-cgu.5.rcgu.dwo
foo.foo.7rcbfp3g-cgu.5.rcgu.o
foo.foo.7rcbfp3g-cgu.6.rcgu.dwo
foo.foo.7rcbfp3g-cgu.6.rcgu.o
foo.foo.7rcbfp3g-cgu.7.rcgu.dwo
foo.foo.7rcbfp3g-cgu.7.rcgu.o
foo.dwp
foo.rs
$ readelf -wi foo.foo.7rcbfp3g-cgu.0.rcgu.o
# ...
Compilation Unit @ offset 0x90:
Length: 0x2c (32-bit)
Version: 4
Abbrev Offset: 0x5b
Pointer Size: 8
<0><9b>: Abbrev Number: 1 (DW_TAG_compile_unit)
<9c> DW_AT_stmt_list : 0xe8
<a0> DW_AT_comp_dir : (indirect string, offset: 0x13b): /home/david/Projects/rust/rust0
<a4> DW_AT_GNU_dwo_name: (indirect string, offset: 0x15b): foo.foo.7rcbfp3g-cgu.0.rcgu.dwo
<a8> DW_AT_GNU_dwo_id : 0x357472a2b032d7b9
<b0> DW_AT_low_pc : 0x0
<b8> DW_AT_ranges : 0x40
<bc> DW_AT_GNU_addr_base: 0x0
# ...
```
##### To-Do
I've opened this PR as a draft to get feedback and work out how we'd expect rustc to work when Split DWARF is requested. It might be easier to read the PR commit-by-commit.
- [ ] Add error when Split DWARF is requested on platforms where it doesn't make sense.
- [x] Determine whether or not there should be a single `dwo` output from rustc, or one per codegen-unit as exists currently.
- [x] Add tests.
- [x] Fix `single` mode - currently single mode doesn't change the invocation of `addPassesToEmitFile`, which is correct, but it also needs to change the split dwarf path provided to `createCompileUnit` and `createTargetMachine` so that it's just the final binary (currently it is still a non-existent `dwo` file).
r? `@nagisa`
cc `@michaelwoerister` `@eddyb` `@alexcrichton` `@rust-lang/wg-incr-comp`
Diffstat (limited to 'compiler/rustc_interface/src')
0 files changed, 0 insertions, 0 deletions