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[profile] Add early checking to bypass node pointer update 

llvm-svn: 270766
This commit is contained in:
Xinliang David Li 2016-05-25 21:27:02 +00:00
parent fad596aa81
commit 65971297a0
2 changed files with 13 additions and 3 deletions
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11
compiler-rt/lib/profile/InstrProfilingValue.c
View File

@ -103,16 +103,21 @@ static ValueProfNode *allocateOneNode(__llvm_profile_data *Data, uint32_t Index,
if (!hasStaticCounters)
return (ValueProfNode *)calloc(1, sizeof(ValueProfNode));
Node = COMPILER_RT_PTR_FETCH_ADD(ValueProfNode, CurrentVNode, 1);
if (Node >= EndVNode) {
/* Early check to avoid value wrapping around. */
if (CurrentVNode >= EndVNode) {
if (OutOfNodesWarnings++ < MAX_VP_WARNS) {
PROF_WARN("Unable to track new values: %s. "
" Consider using option -mllvm -vp-counters-per-site=<n> to allocate more"
" Consider using option -mllvm -vp-counters-per-site=<n> to "
"allocate more"
" value profile counters at compile time. \n",
"Running out of static counters");
}
return 0;
}
Node = COMPILER_RT_PTR_FETCH_ADD(ValueProfNode, CurrentVNode, 1);
if (Node >= EndVNode)
return 0;
return Node;
}

5
compiler-rt/test/profile/instrprof-value-prof.test
View File

@ -11,6 +11,9 @@
// RUN: llvm-profdata merge -text %t.ir.profdata -o %t.ir.proftxt
// RUN: FileCheck %S/Inputs/instrprof-value-prof-real.c --check-prefix=IR < %t.ir.proftxt
// RUN: %clang_profgen -O2 -mllvm -disable-vp=false -Xclang -fprofile-instrument=llvm -mllvm -vp-static-alloc=true -o %t.ir.warn %S/Inputs/instrprof-value-prof-real.c
// RUN: env LLVM_PROFILE_FILE=%t.ir.profraw %run %t.ir.warn 2>&1 |FileCheck --check-prefix=WARNING %s
// IR level instrumentation with dynamic memory allocation
// RUN: %clang_profgen -O2 -mllvm -disable-vp=false -Xclang -fprofile-instrument=llvm -mllvm -vp-static-alloc=false -mllvm -vp-counters-per-site=256 -o %t.ir.dyn %S/Inputs/instrprof-value-prof-real.c
// RUN: env LLVM_PROFILE_FILE=%t.ir.dyn.profraw %run %t.ir.dyn
@ -18,3 +21,5 @@
// RUN: llvm-profdata show --all-functions -ic-targets %t.ir.dyn.profdata | FileCheck %S/Inputs/instrprof-value-prof-real.c
// RUN: llvm-profdata merge -text %t.ir.dyn.profdata -o %t.ir.dyn.proftxt
// RUN: FileCheck %S/Inputs/instrprof-value-prof-real.c --check-prefix=IR < %t.ir.dyn.proftxt
// WARNING: LLVM Profile Warning: