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bors 17a07d71bf Auto merge of #76570 - cratelyn:implement-rfc-2945-c-unwind-abi, r=Amanieu 
Implement RFC 2945: "C-unwind" ABI

## Implement RFC 2945: "C-unwind" ABI

This branch implements [RFC 2945]. The tracking issue for this RFC is #74990.

The feature gate for the issue is `#![feature(c_unwind)]`.

This RFC was created as part of the ffi-unwind project group tracked at rust-lang/lang-team#19.

### Changes

Further details will be provided in commit messages, but a high-level overview
of the changes follows:

* A boolean `unwind` payload is added to the `C`, `System`, `Stdcall`,
and `Thiscall` variants, marking whether unwinding across FFI boundaries is
acceptable. The cases where each of these variants' `unwind` member is true
correspond with the `C-unwind`, `system-unwind`, `stdcall-unwind`, and
`thiscall-unwind` ABI strings introduced in RFC 2945 [3].

* This commit adds a `c_unwind` feature gate for the new ABI strings.
Tests for this feature gate are included in `src/test/ui/c-unwind/`, which
ensure that this feature gate works correctly for each of the new ABIs.
A new language features entry in the unstable book is added as well.

* We adjust the `rustc_middle::ty::layout::fn_can_unwind` function,
used to compute whether or not a `FnAbi` object represents a function that
should be able to unwind when `panic=unwind` is in use.

* Changes are also made to
`rustc_mir_build::build::should_abort_on_panic` so that the function ABI is
used to determind whether it should abort, assuming that the `panic=unwind`
strategy is being used, and no explicit unwind attribute was provided.

[RFC 2945]: https://github.com/rust-lang/rfcs/blob/master/text/2945-c-unwind-abi.md
2021-03-10 16:44:04 +00:00
..
auxiliary
Remove licenses
2018-12-25 21:08:33 -07:00
avr
Assert that locals have storage when used
2020-10-31 21:06:29 +01:00
dllimports
Drop support for cloudabi targets
2020-11-22 17:11:41 -05:00
intrinsics
remove move_val_init leftovers
2020-12-31 10:53:37 +01:00
non-terminate
Remove the -Zinsert-sideeffect
2021-03-10 12:21:43 +02:00
remap_path_prefix
Add hash of source files in debug info
2020-04-02 14:13:19 -07:00
riscv-abi
Update tests for extern block linting
2021-01-13 07:49:16 -05:00
simd-intrinsic
args may be passed by value
2020-11-29 18:36:30 +10:00
src-hash-algorithm
Add support for SHA256 source file hashing for LLVM 11+.
2020-10-14 15:09:51 -07:00
unwind-abis
implement unwinding abi's (RFC 2945)
2021-03-09 14:38:29 -05:00
abi-efiapi.rs
fully exploited the dropped support of LLVM 8
2020-11-12 14:39:47 +01:00
abi-main-signature-16bit-c-int.rs
test: codegen: skip tests inappropriate for riscv64
2020-06-04 12:02:03 +01:00
abi-main-signature-32bit-c-int.rs
Update codegen tests with unnamed arguments
2020-01-07 21:28:22 +01:00
abi-repr-ext.rs
Consider Scalar to be a bool only if its unsigned
2021-01-30 00:49:10 +02:00
abi-sysv64.rs
test: codegen: skip tests inappropriate for riscv64
2020-06-04 12:02:03 +01:00
abi-x86_64_sysv.rs
Remove licenses
2018-12-25 21:08:33 -07:00
abi-x86-interrupt.rs
test: codegen: skip tests inappropriate for riscv64
2020-06-04 12:02:03 +01:00
adjustments.rs
codegen: use "_N" (like for other locals) instead of "argN", for argument names.
2019-09-13 19:25:05 +03:00
align-enum.rs
Disable MIR optimization for alignment codegen tests
2020-05-16 17:15:24 -07:00
align-struct.rs
Disable MIR optimization for alignment codegen tests
2020-05-16 17:15:24 -07:00
alloc-optimisation.rs
Gate llvm.sideeffect under -Z insert-sideeffect
2019-09-28 07:13:53 +08:00
arg-return-value-in-reg.rs
make test work in llvm 9
2020-11-30 01:21:47 -05:00
asm-multiple-options.rs
Add codegen test for multiple asm! options
2020-06-20 11:12:42 -07:00
asm-options.rs
Add tests for asm!
2020-05-18 14:41:32 +01:00
asm-sanitize-llvm.rs
Add a test for escaping LLVMisms in inline asm
2021-02-06 15:18:37 +02:00
async-fn-debug-msvc.rs
Split out async fn and generator test
2020-06-24 15:08:59 -07:00
async-fn-debug.rs
Split out async fn and generator test
2020-06-24 15:08:59 -07:00
atomic-operations.rs
Test codegen of compare_exchange operations
2020-07-17 00:00:00 +00:00
bool-cmp.rs
Update bool-cmp.rs codegen
2020-01-07 21:28:22 +01:00
box-maybe-uninit.rs
stabilize core parts of MaybeUninit and deprecate mem::uninitialized in the future
2019-05-20 10:44:02 +02:00
c-variadic-copy.rs
Expose VaListImpl as the Rust equivalent of __va_list_tag and implement Clone for it.
2019-06-17 16:04:49 -07:00
c-variadic-opt.rs
Expose VaListImpl as the Rust equivalent of __va_list_tag and implement Clone for it.
2019-06-17 16:04:49 -07:00
c-variadic.rs
Use call instead of invoke for functions that cannot unwind
2020-04-15 05:45:21 -04:00
call-llvm-intrinsics.rs
Update tests for extern block linting
2021-01-13 07:49:16 -05:00
call-metadata.rs
Remove licenses
2018-12-25 21:08:33 -07:00
catch-unwind.rs
test: codegen: skip catch-unwind on riscv64
2020-06-04 12:15:26 +01:00
cdylib-external-inline-fns.rs
Fix exports with #[inline(always)]
2020-06-15 09:40:56 +01:00
cfguard-checks.rs
Stabilize control-flow-guard codegen option
2020-07-14 15:27:42 +01:00
cfguard-disabled.rs
Stabilize control-flow-guard codegen option
2020-07-14 15:27:42 +01:00
cfguard-nochecks.rs
Stabilize control-flow-guard codegen option
2020-07-14 15:27:42 +01:00
cfguard-non-msvc.rs
Stabilize control-flow-guard codegen option
2020-07-14 15:27:42 +01:00
coercions.rs
Remove licenses
2018-12-25 21:08:33 -07:00
consts.rs
Make codegen test bitwidth-independent
2020-09-20 09:09:56 +02:00
dealloc-no-unwind.rs
Update tests for extern block linting
2021-01-13 07:49:16 -05:00
debug-column-msvc.rs
Test that column information is not emitted for MSVC targets
2020-02-26 21:45:34 +01:00
debug-column.rs
Update tests for extern block linting
2021-01-13 07:49:16 -05:00
debug-compile-unit-path.rs
Test CU directory is the work_dir
2021-02-20 15:56:36 +02:00
debug-linkage-name.rs
Update code to account for extern ABI requirement
2021-01-13 07:49:45 -05:00
drop.rs
Defer creating drop trees in MIR lowering until leaving that scope
2020-10-04 07:54:01 -04:00
enum-bounds-check-derived-idx.rs
Add codegen tests
2020-08-31 08:19:15 +02:00
enum-bounds-check-issue-13926.rs
Add codegen tests
2020-08-31 08:19:15 +02:00
enum-bounds-check.rs
Add codegen tests
2020-08-31 08:19:15 +02:00
enum-debug-clike.rs
Update the minimum external LLVM to 8
2020-04-14 12:44:41 -07:00
enum-debug-niche-2.rs
Update the minimum external LLVM to 8
2020-04-14 12:44:41 -07:00
enum-debug-niche.rs
Update the minimum external LLVM to 8
2020-04-14 12:44:41 -07:00
enum-debug-tagged.rs
Update the minimum external LLVM to 8
2020-04-14 12:44:41 -07:00
enum-discriminant-value.rs
Update tests to remove old numeric constants
2020-11-29 00:55:55 -05:00
export-no-mangle.rs
Update code to account for extern ABI requirement
2021-01-13 07:49:45 -05:00
external-no-mangle-fns.rs
Fix exports with #[inline(always)]
2020-06-15 09:40:56 +01:00
external-no-mangle-statics.rs
Upgrade Emscripten targets to use upstream LLVM backend
2019-10-16 17:06:48 -07:00
fastcall-inreg.rs
test: codegen: skip tests inappropriate for riscv64
2020-06-04 12:02:03 +01:00
fatptr.rs
Remove licenses
2018-12-25 21:08:33 -07:00
fewer-names.rs
Allow using -Z fewer-names=no to retain value names
2020-11-23 00:00:00 +00:00
ffi-const.rs
Update tests for extern block linting
2021-01-13 07:49:16 -05:00
ffi-out-of-bounds-loads.rs
Update tests for extern block linting
2021-01-13 07:49:16 -05:00
ffi-pure.rs
Update tests for extern block linting
2021-01-13 07:49:16 -05:00
ffi-returns-twice.rs
Update tests for extern block linting
2021-01-13 07:49:16 -05:00
float_math.rs
Remove licenses
2018-12-25 21:08:33 -07:00
fn-impl-trait-self.rs
Add codegen test
2019-03-31 20:09:30 -04:00
foo.s
Add global_asm tests
2017-04-12 19:12:50 -05:00
force-frame-pointers.rs
Update the minimum external LLVM to 8
2020-04-14 12:44:41 -07:00
force-unwind-tables.rs
fully exploited the dropped support of LLVM 8
2020-11-12 14:39:47 +01:00
function-arguments.rs
Support LLVM 12 in rustc
2021-02-28 10:19:44 +01:00
gdb_debug_script_load.rs
Disable gdb pretty printer global section on wasm targets
2019-12-04 20:15:21 -08:00
generator-debug-msvc.rs
Split out async fn and generator test
2020-06-24 15:08:59 -07:00
generator-debug.rs
Split out async fn and generator test
2020-06-24 15:08:59 -07:00
generic-debug.rs
Remove unnecessary ignore-tidy-linelength
2019-04-23 11:42:14 +01:00
global_asm_include.rs
Remove licenses
2018-12-25 21:08:33 -07:00
global_asm_x2.rs
Remove licenses
2018-12-25 21:08:33 -07:00
global_asm.rs
Remove licenses
2018-12-25 21:08:33 -07:00
i686-macosx-deployment-target.rs
choose a more specific LLVM target on OS X when necessary
2019-05-07 11:09:39 -04:00
i686-no-macosx-deployment-target.rs
default to $ARCH-apple-macosx10.7.0 LLVM triple for darwin targets
2019-05-13 17:04:59 -04:00
inline-always-works-always.rs
Support revisions for codegen tests
2019-01-24 20:13:51 +02:00
inline-debuginfo.rs
Ignore long lines in test
2020-10-26 14:09:27 +00:00
inline-hint.rs
Fix setting inline hint based on InstanceDef::requires_inline
2020-11-17 00:00:00 +00:00
instrument-mcount.rs
Update the minimum external LLVM to 8
2020-04-14 12:44:41 -07:00
integer-cmp.rs
Small improvement for Ord implementation of integers
2019-08-29 03:52:18 +00:00
integer-overflow.rs
Added a codegen test for a recent optimization for overflow-checks=on
2020-05-24 16:20:02 -04:00
internalize-closures.rs
Ensure that closure call is not removed by MIR optimizations in a test
2020-11-12 00:00:00 +00:00
intrinsic-no-unnamed-attr.rs
Remove licenses
2018-12-25 21:08:33 -07:00
issue-13018.rs
Remove licenses
2018-12-25 21:08:33 -07:00
issue-15953.rs
Remove licenses
2018-12-25 21:08:33 -07:00
issue-27130.rs
Make sure the functions don't get merged
2020-08-28 01:16:20 +02:00
issue-32031.rs
Remove licenses
2018-12-25 21:08:33 -07:00
issue-32364.rs
Remove licenses
2018-12-25 21:08:33 -07:00
issue-34634.rs
Add test for issue #34634
2020-09-20 11:15:00 +02:00
issue-34947-pow-i32.rs
Gate llvm.sideeffect under -Z insert-sideeffect
2019-09-28 07:13:53 +08:00
issue-37945.rs
Fix codegen test for issue 37945
2020-11-12 00:00:00 +00:00
issue-44056-macos-tls-align.rs
Ignore changes when debug assertions are enabled.
2020-07-09 10:41:33 -07:00
issue-45222.rs
Disable failing codegen test
2020-02-08 18:47:41 -05:00
issue-45466.rs
ignore some codegen tests in debug mode
2019-07-15 16:56:43 +02:00
issue-45964-bounds-check-slice-pos.rs
Add codegen test for #45964
2020-10-23 01:15:08 +02:00
issue-47278.rs
Update code to account for extern ABI requirement
2021-01-13 07:49:45 -05:00
issue-47442.rs
Remove licenses
2018-12-25 21:08:33 -07:00
issue-56267-2.rs
rustc_codegen_llvm: don't overalign loads of pair operands.
2018-11-29 00:37:38 +02:00
issue-56267.rs
Fix alignment of stores to scalar pair
2018-11-28 00:31:03 +01:00
issue-56927.rs
Update tests to remove old numeric constants
2020-11-29 00:55:55 -05:00
issue-58881.rs
Fix LLVM IR generated for C-variadic arguments
2019-03-31 17:37:37 +00:00
issue-59352.rs
Bump mir-opt-level from 2 to 3 in tests
2021-03-05 17:13:57 -03:00
issue-69101-bounds-check.rs
Slightly improve panic messages when range indices are out of bounds
2020-07-20 00:40:42 +02:00
issue-73031.rs
add codegen tests for some issues closed by LLVM 12
2021-03-07 17:56:09 -05:00
issue-73396-bounds-check-after-position.rs
Test that bounds checks are elided for indexing after .[r]position()
2020-09-14 22:19:48 -04:00
issue-73827-bounds-check-index-in-subexpr.rs
Add codegen test for issue #73827
2020-10-17 13:18:29 +02:00
issue-75525-bounds-checks.rs
Add regression test for #75525
2021-03-05 16:01:46 +01:00
issue-75546.rs
add codegen tests for some issues closed by LLVM 12
2021-03-07 17:56:09 -05:00
issue-75659.rs
Only test on x86_64
2020-10-01 16:02:32 +02:00
issue-77812.rs
add codegen tests for some issues closed by LLVM 12
2021-03-07 17:56:09 -05:00
lifetime_start_end.rs
simplify-locals: Remove unused assignments regardless of rvalue kind
2020-10-26 10:48:28 +01:00
link_section.rs
Upgrade Emscripten targets to use upstream LLVM backend
2019-10-16 17:06:48 -07:00
link-dead-code.rs
test: support both (legacy and v0) choices of mangling.
2019-05-31 18:24:53 +03:00
loads.rs
simplify-locals: Remove unused assignments regardless of rvalue kind
2020-10-26 10:48:28 +01:00
local-generics-in-exe-internalized.rs
test: support both (legacy and v0) choices of mangling.
2019-05-31 18:24:53 +03:00
lto-removes-invokes.rs
Remove licenses
2018-12-25 21:08:33 -07:00
mainsubprogram.rs
Adjust codegen tests for DISPFlagMainSubprogram
2019-07-09 21:55:29 +02:00
mainsubprogramstart.rs
Adjust codegen tests for DISPFlagMainSubprogram
2019-07-09 21:55:29 +02:00
match-optimizes-away.rs
Remove licenses
2018-12-25 21:08:33 -07:00
match.rs
Introduce MIR optimizations for simplifying x? on Results.
2019-11-21 20:05:16 +01:00
mir_zst_stores.rs
Remove licenses
2018-12-25 21:08:33 -07:00
naked-functions.rs
Validate use of parameters in naked functions
2020-11-25 00:00:00 +00:00
naked-noinline.rs
Bump mir-opt-level from 2 to 3 in tests
2021-03-05 17:13:57 -03:00
no-assumes-on-casts.rs
Remove licenses
2018-12-25 21:08:33 -07:00
no-dllimport-w-cross-lang-lto.rs
Stabilize linker-plugin based LTO.
2019-02-12 15:10:29 +01:00
no-output-asm-is-volatile.rs
Update tests to use llvm_asm!
2020-03-26 15:49:22 +00:00
no-plt.rs
Remove licenses
2018-12-25 21:08:33 -07:00
noreturn-uninhabited.rs
Remove unnecessary ignore-tidy-linelength
2019-04-23 11:42:14 +01:00
noreturnflag.rs
Remove unnecessary ignore-tidy-linelength
2019-04-23 11:42:14 +01:00
nounwind.rs
Remove double trailing newlines
2019-04-22 16:57:01 +01:00
nrvo.rs
Test that NRVO elides the call to memcpy
2020-05-17 10:24:06 -07:00
optimize-attr-1.rs
[mir-opt] Turn on the ConstProp pass by default
2019-11-11 20:57:26 -05:00
packed.rs
Support LLVM 12 in rustc
2021-02-28 10:19:44 +01:00
panic-abort-windows.rs
Drop support for cloudabi targets
2020-11-22 17:11:41 -05:00
personality_lifetimes.rs
Re-enable Emscripten's exception handling support
2019-10-25 15:16:36 -07:00
pgo-instrumentation.rs
Relax checks in pgo-instrumentation codegen test
2019-07-15 14:01:26 +02:00
README.md
add link to FileCheck docs
2019-08-26 20:40:30 +02:00
refs.rs
simplify-locals: Remove unused assignments regardless of rvalue kind
2020-10-26 10:48:28 +01:00
repeat-trusted-len.rs
fix a codegen test
2020-03-14 14:05:26 +01:00
repr-transparent-aggregates-1.rs
Support LLVM 12 in rustc
2021-02-28 10:19:44 +01:00
repr-transparent-aggregates-2.rs
Support LLVM 12 in rustc
2021-02-28 10:19:44 +01:00
repr-transparent-aggregates-3.rs
Support LLVM 12 in rustc
2021-02-28 10:19:44 +01:00
repr-transparent-sysv64.rs
Update codegen tests with unnamed arguments
2020-01-07 21:28:22 +01:00
repr-transparent.rs
Update code to account for extern ABI requirement
2021-01-13 07:49:45 -05:00
sanitizer-memory-track-orgins.rs
compiletest: Add directives to detect sanitizer support
2020-06-13 14:24:30 +02:00
sanitizer-no-sanitize-inlining.rs
Bump mir-opt-level from 3 to 4 in tests
2021-03-05 17:13:57 -03:00
sanitizer-no-sanitize.rs
Fix typo in code comment
2020-12-10 19:06:29 -05:00
sanitizer-recover.rs
Prepare for LLVM 11
2020-06-25 18:52:41 -07:00
scalar-pair-bool.rs
Match scalar-pair-bool more flexibly for LLVM 11
2020-08-22 13:44:54 -07:00
set-discriminant-invalid.rs
use abort instead of unreachable
2019-12-06 00:10:01 +01:00
slice-as_chunks.rs
Try ignore-debug in the codegen test
2021-01-16 14:52:48 -08:00
slice-init.rs
Remove licenses
2018-12-25 21:08:33 -07:00
slice-iter-len-eq-zero.rs
Help LLVM better optimize slice::Iter(Mut)::len
2019-06-15 21:15:25 -07:00
slice-position-bounds-check.rs
Remove licenses
2018-12-25 21:08:33 -07:00
slice-ref-equality.rs
Remove pointer comparison from slice equality
2020-12-26 06:43:51 +00:00
slice-windows-no-bounds-check.rs
Add codegen test
2020-10-07 16:17:01 +03:00
some-global-nonnull.rs
Emit == null instead of <= null
2020-08-08 10:45:15 +02:00
sparc-struct-abi.rs
Remove licenses
2018-12-25 21:08:33 -07:00
stack-probes.rs
Use probe-stack=inline-asm in LLVM 11+
2021-01-14 22:49:16 -05:00
staticlib-external-inline-fns.rs
Fix exports with #[inline(always)]
2020-06-15 09:40:56 +01:00
stores.rs
Update the minimum external LLVM to 7
2019-12-02 11:36:21 -08:00
swap-small-types.rs
ignore some codegen tests in debug mode
2019-07-15 16:56:43 +02:00
target-cpu-on-functions.rs
Update code to account for extern ABI requirement
2021-01-13 07:49:45 -05:00
target-feature-multiple.rs
cmdline: Make target features individually overridable
2020-05-11 02:04:53 +03:00
target-feature-on-functions.rs
Remove licenses
2018-12-25 21:08:33 -07:00
to_vec.rs
Change slice::to_vec to not use extend_from_slice
2020-11-22 22:22:03 +00:00
transmute-scalar.rs
tests: codegen/transmute-scalar needs optimizations enabled.
2020-12-10 13:24:47 +02:00
try_identity.rs
Bump mir-opt-level from 2 to 3 in tests
2021-03-05 17:13:57 -03:00
try-panic-abort.rs
Simplify the try intrinsic by using a callback in the catch block
2020-03-05 17:36:50 +00:00
tune-cpu-on-functions.rs
Pass tune-cpu to LLVM
2020-10-05 07:50:44 +08:00
tuple-layout-opt.rs
add tests related to tuple scalar layout with ZST in last field
2020-08-30 14:58:03 -04:00
unchecked-float-casts.rs
Improve codegen for unchecked float casts on wasm
2020-07-22 15:05:05 -07:00
union-abi.rs
Pass arguments up to 2*usize by value
2020-11-29 20:08:00 -05:00
unwind-extern-exports.rs
Update code to account for extern ABI requirement
2021-01-13 07:49:45 -05:00
unwind-extern-imports.rs
Update tests for extern block linting
2021-01-13 07:49:16 -05:00
var-names.rs
rustc_codegen_llvm: give names to non-alloca variable values.
2019-09-06 16:57:20 +03:00
vec-clear.rs
we can enable one more codegen test in debug mode now
2020-06-16 16:01:30 -04:00
vec-iter-collect-len.rs
Gate llvm.sideeffect under -Z insert-sideeffect
2019-09-28 07:13:53 +08:00
vec-optimizes-away.rs
we can enable one more codegen test in debug mode now
2020-06-16 16:01:30 -04:00
vec-shrink-panic.rs
shrink_to shouldn't panic on len greater than capacity
2021-01-26 19:25:37 +01:00
vecdeque_no_panic.rs
Remove unreachable panics from VecDeque
2021-01-14 19:31:56 +01:00
vtabletype.rs
Remove unnecessary ignore-tidy-linelength
2019-04-23 11:42:14 +01:00
wasm_casts_nontrapping.rs
Add codegen tests
2020-07-02 09:32:09 +02:00
wasm_casts_trapping.rs
rustc: Improving safe wasm float->int casts
2020-07-28 10:17:11 -07:00
x86_64-macosx-deployment-target.rs
choose a more specific LLVM target on OS X when necessary
2019-05-07 11:09:39 -04:00
x86_64-no-macosx-deployment-target.rs
default to $ARCH-apple-macosx10.7.0 LLVM triple for darwin targets
2019-05-13 17:04:59 -04:00
zip.rs
Remove licenses
2018-12-25 21:08:33 -07:00
zst-offset.rs
handle vector layout
2020-08-30 14:58:03 -04:00

README.md

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