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Add -fprofile-dir= to clang.

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-fprofile-dir=path allows the user to specify where .gcda files should be
emitted when the program is run. In particular, this is the first flag that
causes the .gcno and .o files to have different paths, LLVM is extended to
support this. -fprofile-dir= does not change the file name in the .gcno (and
thus where lcov looks for the source) but it does change the name in the .gcda
(and thus where the runtime library writes the .gcda file). It's different from
a GCOV_PREFIX because a user can observe that the GCOV_PREFIX_STRIP will strip
paths off of -fprofile-dir= but not off of a supplied GCOV_PREFIX.

To implement this we split -coverage-file into -coverage-data-file and
-coverage-notes-file to specify the two different names. The !llvm.gcov
metadata node grows from a 2-element form {string coverage-file, node dbg.cu}
to 3-elements, {string coverage-notes-file, string coverage-data-file, node
dbg.cu}. In the 3-element form, the file name is already "mangled" with
.gcno/.gcda suffixes, while the 2-element form left that to the middle end
pass.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280306 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2016-08-31 23:04:32 +00:00
parent 9df3fb3d31
commit 0b94abfb45
2 changed files with 57 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
lib/Transforms/Instrumentation/GCOVProfiling.cpp
View File

@ -118,7 +118,8 @@ private:
Function *insertFlush(ArrayRef<std::pair<GlobalVariable *, MDNode *>>);
void insertIndirectCounterIncrement();
std::string mangleName(const DICompileUnit *CU, const char *NewStem);
enum class GCovFileType { GCNO, GCDA };
std::string mangleName(const DICompileUnit *CU, GCovFileType FileType);
GCOVOptions Options;
@ -418,24 +419,40 @@ namespace {
}
std::string GCOVProfiler::mangleName(const DICompileUnit *CU,
const char *NewStem) {
GCovFileType OutputType) {
bool Notes = OutputType == GCovFileType::GCNO;
if (NamedMDNode *GCov = M->getNamedMetadata("llvm.gcov")) {
for (int i = 0, e = GCov->getNumOperands(); i != e; ++i) {
MDNode *N = GCov->getOperand(i);
if (N->getNumOperands() != 2) continue;
MDString *GCovFile = dyn_cast<MDString>(N->getOperand(0));
MDNode *CompileUnit = dyn_cast<MDNode>(N->getOperand(1));
if (!GCovFile || !CompileUnit) continue;
if (CompileUnit == CU) {
SmallString<128> Filename = GCovFile->getString();
sys::path::replace_extension(Filename, NewStem);
return Filename.str();
bool ThreeElement = N->getNumOperands() == 3;
if (!ThreeElement && N->getNumOperands() != 2)
continue;
if (N->getOperand(ThreeElement ? 2 : 1) != CU)
continue;
if (ThreeElement) {
// These nodes have no mangling to apply, it's stored mangled in the
// bitcode.
MDString *NotesFile = dyn_cast<MDString>(N->getOperand(0));
MDString *DataFile = dyn_cast<MDString>(N->getOperand(1));
if (!NotesFile || !DataFile)
continue;
return Notes ? NotesFile->getString() : DataFile->getString();
}
MDString *GCovFile = dyn_cast<MDString>(N->getOperand(0));
if (!GCovFile)
continue;
SmallString<128> Filename = GCovFile->getString();
sys::path::replace_extension(Filename, Notes ? "gcno" : "gcda");
return Filename.str();
}
}
SmallString<128> Filename = CU->getFilename();
sys::path::replace_extension(Filename, NewStem);
sys::path::replace_extension(Filename, Notes ? "gcno" : "gcda");
StringRef FName = sys::path::filename(Filename);
SmallString<128> CurPath;
if (sys::fs::current_path(CurPath)) return FName;
@ -501,7 +518,7 @@ void GCOVProfiler::emitProfileNotes() {
continue;
std::error_code EC;
raw_fd_ostream out(mangleName(CU, "gcno"), EC, sys::fs::F_None);
raw_fd_ostream out(mangleName(CU, GCovFileType::GCNO), EC, sys::fs::F_None);
std::string EdgeDestinations;
unsigned FunctionIdent = 0;
@ -849,7 +866,7 @@ Function *GCOVProfiler::insertCounterWriteout(
if (CU->getDWOId())
continue;
std::string FilenameGcda = mangleName(CU, "gcda");
std::string FilenameGcda = mangleName(CU, GCovFileType::GCDA);
uint32_t CfgChecksum = FileChecksums.empty() ? 0 : FileChecksums[i];
Builder.CreateCall(StartFile,
{Builder.CreateGlobalStringPtr(FilenameGcda),

27
test/Transforms/GCOVProfiling/three-element-mdnode.ll Normal file
View File

@ -0,0 +1,27 @@
; RUN: echo '!10 = !{!"%T/aaa.gcno", !"%T/bbb.gcda", !0}' > %t1
; RUN: cat %s %t1 > %t2
; RUN: opt -insert-gcov-profiling -S -o %t3 < %t2
; RUN: grep _Z3foov %T/aaa.gcno
; RUN: grep bbb.gcda %t3
; RUN: rm %T/aaa.gcno
define void @_Z3foov() !dbg !5 {
entry:
ret void, !dbg !8
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!9}
!llvm.gcov = !{!10}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.3 (trunk 177323)", isOptimized: false, emissionKind: FullDebug, file: !2, enums: !3, retainedTypes: !3, globals: !3, imports: !3)
!1 = !DIFile(filename: "hello.cc", directory: "/home/nlewycky")
!2 = !DIFile(filename: "hello.cc", directory: "/home/nlewycky")
!3 = !{}
!5 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !1, type: !6, variables: !3)
!6 = !DISubroutineType(types: !7)
!7 = !{null}
!8 = !DILocation(line: 1, scope: !5)
!9 = !{i32 1, !"Debug Info Version", i32 3}