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Rollup merge of #79365 - richkadel:llvm-cov-map-version-4, r=wesleywiser

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Upgrades the coverage map to Version 4

Changes the coverage map injected into binaries compiled with
`-Zinstrument-coverage` to LLVM Coverage Mapping Format, Version 4 (from
Version 3). Note, binaries compiled with this version will require LLVM
tools from at least LLVM Version 11.

r? ``@wesleywiser``
This commit is contained in:
Jonas Schievink 2020-11-26 13:39:09 +01:00 • committed by GitHub
commit 0ae653a531
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13 changed files with 258 additions and 148 deletions
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6
compiler/rustc_middle/src/mir/coverage.rs
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@ -21,9 +21,9 @@ rustc_index::newtype_index! {
impl ExpressionOperandId {
/// An expression operand for a "zero counter", as described in the following references:
///
/// * <https://github.com/rust-lang/llvm-project/blob/llvmorg-8.0.0/llvm/docs/CoverageMappingFormat.rst#counter>
/// * <https://github.com/rust-lang/llvm-project/blob/llvmorg-8.0.0/llvm/docs/CoverageMappingFormat.rst#tag>
/// * <https://github.com/rust-lang/llvm-project/blob/llvmorg-8.0.0/llvm/docs/CoverageMappingFormat.rst#counter-expressions>
/// * <https://github.com/rust-lang/llvm-project/blob/rustc/11.0-2020-10-12/llvm/docs/CoverageMappingFormat.rst#counter>
/// * <https://github.com/rust-lang/llvm-project/blob/rustc/11.0-2020-10-12/llvm/docs/CoverageMappingFormat.rst#tag>
/// * <https://github.com/rust-lang/llvm-project/blob/rustc/11.0-2020-10-12/llvm/docs/CoverageMappingFormat.rst#counter-expressions>
///
/// This operand can be used to count two or more separate code regions with a single counter,
/// if they run sequentially with no branches, by injecting the `Counter` in a `BasicBlock` for