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[PGO] Stop using invalid char in instr variable names.

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Before the patch, -fprofile-instr-generate compile will fail
if no integrated-as is specified when the file contains
any static functions (the -S output is also invalid).

This is the second try. The fix in this patch is very localized.
Only profile symbol names of profile symbols with internal 
linkage are fixed up while initializer of name syms are not 
changes. This means there is no format change nor version bump.

llvm-svn: 255434
This commit is contained in:
Xinliang David Li 2015-12-12 17:28:03 +00:00
parent 3f624d4650
commit 9a2e877d9a
4 changed files with 30 additions and 10 deletions
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22
lib/ProfileData/InstrProf.cpp
View File

@ -102,6 +102,26 @@ std::string getPGOFuncName(const Function &F, uint64_t Version) {
Version);
}
// \p FuncName is the string used as profile lookup key for the function. A
// symbol is created to hold the name. Return the legalized symbol name.
static std::string getPGOFuncNameVarName(StringRef FuncName,
GlobalValue::LinkageTypes Linkage) {
std::string VarName = getInstrProfNameVarPrefix();
VarName += FuncName;
if (!GlobalValue::isLocalLinkage(Linkage))
return VarName;
// Now fix up illegal chars in local VarName that may upset the assembler.
const char *InvalidChars = "-:<>\"'";
size_t found = VarName.find_first_of(InvalidChars);
while (found != std::string::npos) {
VarName[found] = '_';
found = VarName.find_first_of(InvalidChars, found + 1);
}
return VarName;
}
GlobalVariable *createPGOFuncNameVar(Module &M,
GlobalValue::LinkageTypes Linkage,
StringRef FuncName) {
@ -120,7 +140,7 @@ GlobalVariable *createPGOFuncNameVar(Module &M,
auto *Value = ConstantDataArray::getString(M.getContext(), FuncName, false);
auto FuncNameVar =
new GlobalVariable(M, Value->getType(), true, Linkage, Value,
Twine(getInstrProfNameVarPrefix()) + FuncName);
getPGOFuncNameVarName(FuncName, Linkage));
// Hide the symbol so that we correctly get a copy for each executable.
if (!GlobalValue::isLocalLinkage(FuncNameVar->getLinkage()))

4
lib/Transforms/Instrumentation/InstrProfiling.cpp
View File

@ -265,8 +265,8 @@ void InstrProfiling::lowerCoverageData(GlobalVariable *CoverageData) {
/// Get the name of a profiling variable for a particular function.
static std::string getVarName(InstrProfIncrementInst *Inc, StringRef Prefix) {
auto *Arr = cast<ConstantDataArray>(Inc->getName()->getInitializer());
StringRef Name = Arr->isCString() ? Arr->getAsCString() : Arr->getAsString();
StringRef NamePrefix = getInstrProfNameVarPrefix();
StringRef Name = Inc->getName()->getName().substr(NamePrefix.size());
return (Prefix + Name).str();
}

10
test/Instrumentation/InstrProfiling/profiling.ll
View File

@ -6,8 +6,8 @@ target triple = "x86_64-apple-macosx10.10.0"
; CHECK: @__llvm_profile_name_foo = hidden constant [3 x i8] c"foo", section "__DATA,__llvm_prf_names", align 1
@__llvm_profile_name_bar = hidden constant [4 x i8] c"bar\00"
; CHECK: @__llvm_profile_name_bar = hidden constant [4 x i8] c"bar\00", section "__DATA,__llvm_prf_names", align 1
@baz_prof_name = hidden constant [3 x i8] c"baz"
; CHECK: @baz_prof_name = hidden constant [3 x i8] c"baz", section "__DATA,__llvm_prf_names", align 1
@__llvm_profile_name_baz = hidden constant [3 x i8] c"baz"
; CHECK: @__llvm_profile_name_baz = hidden constant [3 x i8] c"baz", section "__DATA,__llvm_prf_names", align 1
; CHECK: @__llvm_profile_counters_foo = hidden global [1 x i64] zeroinitializer, section "__DATA,__llvm_prf_cnts", align 8
; CHECK: @__llvm_profile_data_foo = hidden {{.*}}, section "__DATA,__llvm_prf_data", align 8
@ -26,9 +26,9 @@ define void @bar() {
; CHECK: @__llvm_profile_counters_baz = hidden global [3 x i64] zeroinitializer, section "__DATA,__llvm_prf_cnts", align 8
; CHECK: @__llvm_profile_data_baz = hidden {{.*}}, section "__DATA,__llvm_prf_data", align 8
define void @baz() {
call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @baz_prof_name, i32 0, i32 0), i64 0, i32 3, i32 0)
call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @baz_prof_name, i32 0, i32 0), i64 0, i32 3, i32 1)
call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @baz_prof_name, i32 0, i32 0), i64 0, i32 3, i32 2)
call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__llvm_profile_name_baz, i32 0, i32 0), i64 0, i32 3, i32 0)
call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__llvm_profile_name_baz, i32 0, i32 0), i64 0, i32 3, i32 1)
call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__llvm_profile_name_baz, i32 0, i32 0), i64 0, i32 3, i32 2)
ret void
}

4
test/Transforms/PGOProfile/criticaledge.ll
View File

@ -5,7 +5,7 @@ target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; GEN: @__llvm_profile_name_test_criticalEdge = private constant [17 x i8] c"test_criticalEdge"
; GEN: @"__llvm_profile_name_<stdin>:bar" = private constant [11 x i8] c"<stdin>:bar"
; GEN: @__llvm_profile_name__stdin__bar = private constant [11 x i8] c"<stdin>:bar"
define i32 @test_criticalEdge(i32 %i, i32 %j) {
entry:
@ -99,7 +99,7 @@ return:
define internal i32 @bar(i32 %i) {
entry:
; GEN: call void @llvm.instrprof.increment(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @"__llvm_profile_name_<stdin>:bar", i32 0, i32 0), i64 12884901887, i32 1, i32 0)
; GEN: call void @llvm.instrprof.increment(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @__llvm_profile_name__stdin__bar, i32 0, i32 0), i64 12884901887, i32 1, i32 0)
ret i32 %i
}