58 lines
2.2 KiB
Makefile
58 lines
2.2 KiB
Makefile
# needs-profiler-support
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# ignore-msvc
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# FIXME(richkadel): Debug the following problem, and reenable on Windows (by
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# removing the `# ignore-msvc` directive above). The current implementation
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# generates a segfault when running the instrumented `main` executable,
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# after the `main` program code executes, but before the process terminates.
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# This most likely points to a problem generating the LLVM "main.profraw"
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# file.
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-include ../tools.mk
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# This test makes sure that LLVM coverage maps are genereated in LLVM IR.
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COMMON_FLAGS=-Zinstrument-coverage
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all:
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# Compile the test program with instrumentation, and also generate LLVM IR
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$(RUSTC) $(COMMON_FLAGS) main.rs
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# Run it in order to generate some profiling data,
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# with `LLVM_PROFILE_FILE=<profdata_file>` environment variable set to
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# output the coverage stats for this run.
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LLVM_PROFILE_FILE="$(TMPDIR)"/main.profraw \
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$(call RUN,main)
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# Postprocess the profiling data so it can be used by the llvm-cov tool
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"$(LLVM_BIN_DIR)"/llvm-profdata merge --sparse \
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"$(TMPDIR)"/main.profraw \
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-o "$(TMPDIR)"/main.profdata
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# Generate a coverage report using `llvm-cov show`. The output ordering
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# can be non-deterministic, so ignore the return status. If the test fails
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# when comparing the JSON `export`, the `show` output may be useful when
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# debugging.
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"$(LLVM_BIN_DIR)"/llvm-cov show \
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--Xdemangler="$(RUST_DEMANGLER)" \
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--show-line-counts-or-regions \
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--instr-profile="$(TMPDIR)"/main.profdata \
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$(call BIN,"$(TMPDIR)"/main) \
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> "$(TMPDIR)"/actual_show_coverage.txt
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# Compare the show coverage output
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$(DIFF) typical_show_coverage.txt "$(TMPDIR)"/actual_show_coverage.txt || \
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>&2 echo 'diff failed for `llvm-cov show` (might not be an error)'
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# Generate a coverage report in JSON, using `llvm-cov export`, and fail if
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# there are differences from the expected output.
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"$(LLVM_BIN_DIR)"/llvm-cov export \
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--summary-only \
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--instr-profile="$(TMPDIR)"/main.profdata \
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$(call BIN,"$(TMPDIR)"/main) \
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| "$(PYTHON)" prettify_json.py \
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> "$(TMPDIR)"/actual_export_coverage.json
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# Check that the exported JSON coverage data matches what we expect
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$(DIFF) expected_export_coverage.json "$(TMPDIR)"/actual_export_coverage.json
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