[llvm] c8b082a - [llvm-cov gcov] Support clang<11 fake 4.2 format
Fangrui Song via llvm-commits
llvm-commits at lists.llvm.org
Wed Jun 17 10:17:27 PDT 2020
Author: Fangrui Song
Date: 2020-06-17T10:17:15-07:00
New Revision: c8b082a3abe44138fff4ef824300270dd6e8bc77
URL: https://github.com/llvm/llvm-project/commit/c8b082a3abe44138fff4ef824300270dd6e8bc77
DIFF: https://github.com/llvm/llvm-project/commit/c8b082a3abe44138fff4ef824300270dd6e8bc77.diff
LOG: [llvm-cov gcov] Support clang<11 fake 4.2 format
Test cases are restored from a3bed4bd3743b5fee1e66116a63089df742bcae1
Added:
llvm/test/tools/llvm-cov/Inputs/gcov-fake-4.2.gcda
llvm/test/tools/llvm-cov/Inputs/gcov-fake-4.2.gcno
llvm/test/tools/llvm-cov/gcov-fake-4.2.c
Modified:
llvm/lib/ProfileData/GCOV.cpp
Removed:
################################################################################
diff --git a/llvm/lib/ProfileData/GCOV.cpp b/llvm/lib/ProfileData/GCOV.cpp
index 35d40db11716..71ea44a1a722 100644
--- a/llvm/lib/ProfileData/GCOV.cpp
+++ b/llvm/lib/ProfileData/GCOV.cpp
@@ -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) {
- buf.readInt(dummy);
- buf.readInt(dummy);
- buf.readInt(RunCount);
+ // 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;
diff --git a/llvm/test/tools/llvm-cov/Inputs/gcov-fake-4.2.gcda b/llvm/test/tools/llvm-cov/Inputs/gcov-fake-4.2.gcda
new file mode 100644
index 000000000000..613e3a85c026
Binary files /dev/null and b/llvm/test/tools/llvm-cov/Inputs/gcov-fake-4.2.gcda
diff er
diff --git a/llvm/test/tools/llvm-cov/Inputs/gcov-fake-4.2.gcno b/llvm/test/tools/llvm-cov/Inputs/gcov-fake-4.2.gcno
new file mode 100644
index 000000000000..24f1c82476b2
Binary files /dev/null and b/llvm/test/tools/llvm-cov/Inputs/gcov-fake-4.2.gcno
diff er
diff --git a/llvm/test/tools/llvm-cov/gcov-fake-4.2.c b/llvm/test/tools/llvm-cov/gcov-fake-4.2.c
new file mode 100644
index 000000000000..7e8eb2f2a5ff
--- /dev/null
+++ b/llvm/test/tools/llvm-cov/gcov-fake-4.2.c
@@ -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:
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