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[esan|cfrag] Disable load/store instrumentation for cfrag

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Summary:
Adds ClInstrumentFastpath option to control fastpath instrumentation.

Avoids the load/store instrumentation for the cache fragmentation tool.

Renames cache_frag_basic.ll to working_set_slow.ll for slowpath
instrumentation test.

Adds the __esan_init check in struct_field_count_basic.ll.

Reviewers: aizatsky

Subscribers: llvm-commits, bruening, eugenis, kcc, zhaoqin, vitalybuka

Differential Revision: http://reviews.llvm.org/D21079

llvm-svn: 272355
This commit is contained in:
Qin Zhao 2016-06-10 00:48:53 +00:00
parent 7bddaed185
commit b4c774b3be
3 changed files with 20 additions and 8 deletions
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10
lib/Transforms/Instrumentation/EfficiencySanitizer.cpp
View File

@ -56,6 +56,9 @@ static cl::opt<bool> ClInstrumentLoadsAndStores(
static cl::opt<bool> ClInstrumentMemIntrinsics(
"esan-instrument-memintrinsics", cl::init(true),
cl::desc("Instrument memintrinsics (memset/memcpy/memmove)"), cl::Hidden);
static cl::opt<bool> ClInstrumentFastpath(
"esan-instrument-fastpath", cl::init(true),
cl::desc("Instrument fastpath"), cl::Hidden);
// Experiments show that the performance difference can be 2x or more,
// and accuracy loss is typically negligible, so we turn this on by default.
@ -591,7 +594,8 @@ bool EfficiencySanitizer::instrumentLoadOrStore(Instruction *I,
{IRB.CreatePointerCast(Addr, IRB.getInt8PtrTy()),
ConstantInt::get(IntptrTy, TypeSizeBytes)});
} else {
if (instrumentFastpath(I, DL, IsStore, Addr, Alignment)) {
if (ClInstrumentFastpath &&
instrumentFastpath(I, DL, IsStore, Addr, Alignment)) {
NumFastpaths++;
return true;
}
@ -708,8 +712,8 @@ bool EfficiencySanitizer::instrumentFastpathCacheFrag(Instruction *I,
const DataLayout &DL,
Value *Addr,
unsigned Alignment) {
// TODO(bruening): implement a fastpath for aligned accesses
return false;
// Do nothing.
return true; // Return true to avoid slowpath instrumentation.
}
bool EfficiencySanitizer::instrumentFastpathWorkingSet(

10
test/Instrumentation/EfficiencySanitizer/struct_field_count_basic.ll
View File

@ -1,6 +1,6 @@
; Test basic EfficiencySanitizer struct field count instrumentation.
;
; RUN: opt < %s -esan -esan-cache-frag -esan-instrument-loads-and-stores=false -esan-instrument-memintrinsics=false -S | FileCheck %s
; RUN: opt < %s -esan -esan-cache-frag -S | FileCheck %s
%struct.A = type { i32, i32 }
%union.U = type { double }
@ -93,3 +93,11 @@ entry:
; CHECK-NEXT: %k1 = load %struct.A*, %struct.A** %k, align 8
; CHECK-NEXT: %arrayidx13 = getelementptr inbounds %struct.A, %struct.A* %k1, i64 0
; CHECK-NEXT: ret i32 0
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Top-level:
; CHECK: define internal void @esan.module_ctor()
; CHECK: call void @__esan_init(i32 1, i8* bitcast ({ i8*, i32, { i8*, i32, i64*, i8** }* }* @21 to i8*))
; CHECK: define internal void @esan.module_dtor()
; CHECK: call void @__esan_exit(i8* bitcast ({ i8*, i32, { i8*, i32, i64*, i8** }* }* @21 to i8*))

8
test/Instrumentation/EfficiencySanitizer/cache_frag_basic.ll → test/Instrumentation/EfficiencySanitizer/working_set_slow.ll
View File

@ -1,6 +1,6 @@
; Test basic EfficiencySanitizer cache frag instrumentation.
; Test basic EfficiencySanitizer slowpath instrumentation.
;
; RUN: opt < %s -esan -esan-cache-frag -S | FileCheck %s
; RUN: opt < %s -esan -esan-working-set -esan-instrument-fastpath=false -S | FileCheck %s
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Aligned loads:
@ -254,6 +254,6 @@ entry:
; Top-level:
; CHECK: define internal void @esan.module_ctor()
; CHECK: call void @__esan_init(i32 1, i8* bitcast ({ i8*, i32, { i8*, i32, i64*, i8** }* }* @1 to i8*))
; CHECK: call void @__esan_init(i32 2, i8* null)
; CHECK: define internal void @esan.module_dtor()
; CHECK: call void @__esan_exit(i8* bitcast ({ i8*, i32, { i8*, i32, i64*, i8** }* }* @1 to i8*))
; CHECK: call void @__esan_exit(i8* null)