rust/compiler/rustc_codegen_llvm/src/debuginfo, branch 1.50.0

cg_llvm: split dwarf filename and comp dir

2020-12-16T10:33:52+00:00

llvm-dwp concatenates `DW_AT_comp_dir` with `DW_AT_GNU_dwo_name` (only when `DW_AT_comp_dir` exists), which can result in it failing to find the DWARF object files. In earlier testing, `DW_AT_comp_dir` wasn't present in the final object and the current directory was the output directory. When running tests through compiletest, the working directory of the compilation is different from output directory and that resulted in `DW_AT_comp_dir` being in the object file (and set to the current working directory, rather than the output directory), and `DW_AT_GNU_dwo_name` being set to the full path (rather than just the filename), so llvm-dwp was failing. This commit changes the compilation directory provided to LLVM to match the output directory, where DWARF objects are output; and ensures that only the filename is used for `DW_AT_GNU_dwo_name`. Signed-off-by: David Wood

cg_llvm: implement split dwarf support

2020-12-16T10:33:47+00:00

This commit implements Split DWARF support, wiring up the flag (added in earlier commits) to the modified FFI wrapper (also from earlier commits). Signed-off-by: David Wood

llvm: update ffi bindings for split dwarf

2020-12-16T10:31:42+00:00

This commit modifies the FFI bindings to LLVM required for Split DWARF support in rustc. In particular: - `addPassesToEmitFile`'s wrapper, `LLVMRustWriteOutputFile` now takes a `DwoPath` `const char*`. When disabled, `nullptr` should be provided which will preserve existing behaviour. When enabled, the path to the `.dwo` file should be provided. - `createCompileUnit`'s wrapper, `LLVMRustDIBuilderCreateCompileUnit` now has two additional arguments, for the `DWOId` and to enable `SplitDebugInlining`. `DWOId` should always be zero. - `createTargetMachine`'s wrapper, `LLVMRustCreateTargetMachine` has an additional argument which should be provided the path to the `.dwo` when enabled. Signed-off-by: David Wood

[mir-opt] Allow debuginfo to be generated for a constant or a Place

2020-12-07T01:48:25+00:00

Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.

Use Option::map instead of open coding it

2020-11-23T03:58:21+00:00

compiler: fold by value

2020-11-16T21:34:57+00:00

Collapse all uses of `target.options.foo` into `target.foo`

2020-11-08T14:29:13+00:00

with an eye on merging `TargetOptions` into `Target`. `TargetOptions` as a separate structure is mostly an implementation detail of `Target` construction, all its fields logically belong to `Target` and available from `Target` through `Deref` impls.

`u128` truncation and sign extension are not just interpreter related

2020-11-04T13:41:58+00:00

Rollup merge of #77950 - arlosi:sha256, r=eddyb

2020-11-03T18:32:26+00:00

Add support for SHA256 source file hashing Adds support for `-Z src-hash-algorithm sha256`, which became available in LLVM 11. Using an older version of LLVM will cause an error `invalid checksum kind` if the hash algorithm is set to sha256. r? `@eddyb` cc #70401 `@est31`

Fix even more clippy warnings

2020-10-30T14:13:39+00:00