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Improved version check

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This commit is contained in:
Rich Kadel 2020-11-25 09:45:33 -08:00
parent b5fef37d23
commit b4668ecb73
2 changed files with 11 additions and 10 deletions
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16
compiler/rustc_codegen_llvm/src/coverageinfo/mapgen.rs
View File

@ -26,6 +26,11 @@ use tracing::debug;
/// undocumented details in Clang's implementation (that may or may not be important) were also
/// replicated for Rust's Coverage Map.
pub fn finalize<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>) {
// Ensure LLVM supports Coverage Map Version 4 (encoded as a zero-based value: 3).
// If not, the LLVM Version must be less than 11.
let version = coverageinfo::mapping_version();
assert_eq!(version, 3, "rustc option `-Z instrument-coverage` requires LLVM 11 or higher.");
let function_coverage_map = match cx.coverage_context() {
Some(ctx) => ctx.take_function_coverage_map(),
None => return,
@ -68,7 +73,7 @@ pub fn finalize<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>) {
let filenames_ref = coverageinfo::hash_bytes(filenames_buffer);
// Generate the LLVM IR representation of the coverage map and store it in a well-known global
let cov_data_val = mapgen.generate_coverage_map(cx, filenames_size, filenames_val);
let cov_data_val = mapgen.generate_coverage_map(cx, version, filenames_size, filenames_val);
for (mangled_function_name, function_source_hash, coverage_mapping_buffer) in function_data {
save_function_record(
@ -159,21 +164,18 @@ impl CoverageMapGenerator {
fn generate_coverage_map(
self,
cx: &CodegenCx<'ll, 'tcx>,
version: u32,
filenames_size: usize,
filenames_val: &'ll llvm::Value,
) -> &'ll llvm::Value {
debug!(
"cov map: filenames_size = {}, 0-based version = {}",
filenames_size,
coverageinfo::mapping_version()
);
debug!("cov map: filenames_size = {}, 0-based version = {}", filenames_size, version);
// Create the coverage data header (Note, fields 0 and 2 are now always zero,
// as of `llvm::coverage::CovMapVersion::Version4`.)
let zero_was_n_records_val = cx.const_u32(0);
let filenames_size_val = cx.const_u32(filenames_size as u32);
let zero_was_coverage_size_val = cx.const_u32(0);
let version_val = cx.const_u32(coverageinfo::mapping_version());
let version_val = cx.const_u32(version);
let cov_data_header_val = cx.const_struct(
&[zero_was_n_records_val, filenames_size_val, zero_was_coverage_size_val, version_val],
/*packed=*/ false,

5
compiler/rustc_llvm/llvm-wrapper/CoverageMappingWrapper.cpp
View File

@ -73,8 +73,7 @@ extern "C" void LLVMRustCoverageWriteFuncSectionNameToString(LLVMModuleRef M,
RustStringRef Str) {
#if LLVM_VERSION_GE(11, 0)
WriteSectionNameToString(M, IPSK_covfun, Str);
#else
report_fatal_error("rustc option `-Z instrument-coverage` requires LLVM 11 or higher.");
// else do nothing; the `Version` check will abort codegen on the Rust side
#endif
}
@ -88,6 +87,6 @@ extern "C" uint32_t LLVMRustCoverageMappingVersion() {
#if LLVM_VERSION_GE(11, 0)
return coverage::CovMapVersion::Version4;
#else
report_fatal_error("rustc option `-Z instrument-coverage` requires LLVM 11 or higher.");
return coverage::CovMapVersion::Version3;
#endif
}