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Most coverage metadata is encoded into two sections in the final executable. The `__llvm_covmap` section mostly just contains a list of filenames, while the `__llvm_covfun` section contains encoded coverage maps for each instrumented function. The catch is that each per-function record also needs to contain a hash of the filenames list that it refers to. Historically this was handled by assembling most of the per-function data into a temporary list, then assembling the filenames buffer, then using the filenames hash to emit the per-function data, and then finally emitting the filenames table itself. However, now that we build the filenames table up-front (via a separate traversal of the per-function data), we can hash and emit that part first, and then emit each of the per-function records immediately after building. This removes the awkwardness of having to temporarily store nearly-complete per-function records.
51 lines
2.2 KiB
Plaintext
51 lines
2.2 KiB
Plaintext
# Check for metadata, variables, declarations, and function definitions injected
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# into LLVM IR when compiling with -Cinstrument-coverage.
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WINDOWS: $__llvm_profile_runtime_user = comdat any
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CHECK: @__llvm_coverage_mapping = private constant
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CHECK-SAME: section "[[INSTR_PROF_COVMAP]]", align 8
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CHECK: @__covrec_{{[A-F0-9]+}}u = linkonce_odr hidden constant
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CHECK-SAME: section "[[INSTR_PROF_COVFUN]]"[[COMDAT_IF_SUPPORTED]], align 8
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WINDOWS: @__llvm_profile_runtime = external{{.*}}global i32
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CHECK: @__profc__R{{[a-zA-Z0-9_]+}}testprog14will_be_called = {{private|internal}} global
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CHECK-SAME: section "[[INSTR_PROF_CNTS]]"{{.*}}, align 8
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CHECK: @__profd__R{{[a-zA-Z0-9_]+}}testprog14will_be_called = {{private|internal}} global
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CHECK-SAME: @__profc__R{{[a-zA-Z0-9_]+}}testprog14will_be_called
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CHECK-SAME: section "[[INSTR_PROF_DATA]]"{{.*}}, align 8
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CHECK: @__profc__R{{[a-zA-Z0-9_]+}}testprog4main = {{private|internal}} global
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CHECK-SAME: section "[[INSTR_PROF_CNTS]]"{{.*}}, align 8
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CHECK: @__profd__R{{[a-zA-Z0-9_]+}}testprog4main = {{private|internal}} global
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CHECK-SAME: @__profc__R{{[a-zA-Z0-9_]+}}testprog4main
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CHECK-SAME: section "[[INSTR_PROF_DATA]]"{{.*}}, align 8
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CHECK: @__llvm_prf_nm = private constant
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CHECK-SAME: section "[[INSTR_PROF_NAME]]", align 1
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CHECK: @llvm.used = appending global
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CHECK-SAME: @__llvm_coverage_mapping
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CHECK-SAME: @__llvm_prf_nm
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CHECK-SAME: section "llvm.metadata"
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CHECK: [[DEFINE_INTERNAL]] { {{.*}} } @_R{{[a-zA-Z0-9_]+}}testprog14will_be_called() unnamed_addr #{{[0-9]+}} {
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CHECK-NEXT: start:
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CHECK-NOT: [[DEFINE_INTERNAL]]
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CHECK: atomicrmw add ptr
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CHECK-SAME: @__profc__R{{[a-zA-Z0-9_]+}}testprog14will_be_called,
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CHECK: declare void @llvm.instrprof.increment(ptr, i64, i32, i32) #[[LLVM_INSTRPROF_INCREMENT_ATTR:[0-9]+]]
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WINDOWS: define linkonce_odr hidden i32 @__llvm_profile_runtime_user() #[[LLVM_PROFILE_RUNTIME_USER_ATTR:[0-9]+]] comdat {
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WINDOWS-NEXT: %1 = load i32, ptr @__llvm_profile_runtime
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WINDOWS-NEXT: ret i32 %1
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WINDOWS-NEXT: }
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CHECK: attributes #[[LLVM_INSTRPROF_INCREMENT_ATTR]] = { nounwind }
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WINDOWS: attributes #[[LLVM_PROFILE_RUNTIME_USER_ATTR]] = { noinline }
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