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[llvm-cov gcov] Support clang<11 fake 4.2 format

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Test cases are restored from a3bed4bd37
This commit is contained in:
Fangrui Song 2020-06-17 10:17:15 -07:00
parent 64c87a94ca
commit c8b082a3ab
4 changed files with 51 additions and 4 deletions
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10
llvm/lib/ProfileData/GCOV.cpp
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@ -175,16 +175,24 @@ bool GCOVFile::readGCDA(GCOVBuffer &buf) {
if (tag == GCOV_TAG_OBJECT_SUMMARY) {
buf.readInt(RunCount);
buf.readInt(dummy);
// clang<11 uses a fake 4.2 format which sets length to 9.
if (length == 9)
buf.readInt(RunCount);
} else if (tag == GCOV_TAG_PROGRAM_SUMMARY) {
// clang<11 uses a fake 4.2 format which sets length to 0.
if (length > 0) {
buf.readInt(dummy);
buf.readInt(dummy);
buf.readInt(RunCount);
}
++ProgramCount;
} else if (tag == GCOV_TAG_FUNCTION) {
if (length == 0) // Placeholder
continue;
// As of GCC 10, GCOV_TAG_FUNCTION_LENGTH has never been larger than 3.
if ((length != 2 && length != 3) || !buf.readInt(ident))
// However, clang<11 uses a fake 4.2 format which may set length larger
// than 3.
if (length < 2 || !buf.readInt(ident))
return false;
auto It = IdentToFunction.find(ident);
uint32_t linenoChecksum, cfgChecksum = 0;

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llvm/test/tools/llvm-cov/Inputs/gcov-fake-4.2.gcda Normal file
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llvm/test/tools/llvm-cov/Inputs/gcov-fake-4.2.gcno Normal file
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39
llvm/test/tools/llvm-cov/gcov-fake-4.2.c Normal file
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@ -0,0 +1,39 @@
/// Test that llvm-cov supports a fake gcov 4.2 format used before clang 11.
// RUN: rm -rf %t && mkdir %t && cd %t
// RUN: llvm-cov gcov test. --gcno=%S/Inputs/gcov-fake-4.2.gcno --gcda=%S/Inputs/gcov-fake-4.2.gcda | FileCheck %s
// RUN: FileCheck %s --check-prefix=C < test.cpp.gcov
// RUN: FileCheck %s --check-prefix=H < test.h.gcov
// CHECK: File 'test.cpp'
// CHECK-NEXT: Lines executed:84.21% of 38
// CHECK-NEXT: Creating 'test.cpp.gcov'
// CHECK-EMPTY:
// CHECK-NEXT: File './test.h'
// CHECK-NEXT: Lines executed:100.00% of 1
// CHECK-NEXT: Creating 'test.h.gcov'
// CHECK-EMPTY:
// C: -: 0:Source:test.cpp
// C-NEXT: -: 0:Graph:{{.*}}gcov-fake-4.2.gcno
// C-NEXT: -: 0:Data:{{.*}}gcov-fake-4.2.gcda
/// `Runs` is stored in GCOV_TAG_OBJECT_SUMMARY with a length of 9.
// C-NEXT: -: 0:Runs:2
// C-NEXT: -: 0:Programs:1
// C-NEXT: -: 1:
// C-NEXT: -: 2:
// C-NEXT: -: 3:
// C-NEXT: -: 4:
// C-NEXT: -: 5:
// C-NEXT: -: 6:
// C-NEXT: -: 7:
// C-NEXT: -: 8:
// C-NEXT: -: 9:
// C-NEXT:8589934592: 10:
// H: -: 0:Source:./test.h
// H-NEXT: -: 0:Graph:{{.*}}gcov-fake-4.2.gcno
// H-NEXT: -: 0:Data:{{.*}}gcov-fake-4.2.gcda
// H-NEXT: -: 0:Runs:2
// H-NEXT: -: 0:Programs:1
// H-NEXT: 4: 1: