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llvm-mirror/test/Instrumentation/AddressSanitizer/instrument_global.ll
Kostya Serebryany 2ae1ed1c8f [asan] Optimize accesses to global arrays with constant index
Summary:
Given a global array G[N], which is declared in this CU and has static initializer
avoid instrumenting accesses like G[i], where 'i' is a constant and 0<=i<N.
Also add a bit of stats.

This eliminates ~1% of instrumentations on SPEC2006
and also partially helps when asan is being run together with coverage.

Reviewers: samsonov

Reviewed By: samsonov

CC: llvm-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1947

llvm-svn: 192794
2013-10-16 14:06:14 +00:00

82 lines
2.7 KiB
LLVM

; RUN: opt < %s -asan -asan-module -S | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-unknown-linux-gnu"
@xxx = global i32 0, align 4
; If a global is present, __asan_[un]register_globals should be called from
; module ctor/dtor
; CHECK: llvm.global_ctors
; CHECK: llvm.global_dtors
; Test that we don't instrument global arrays with static initializer
; indexed with constants in-bounds. But instrument all other cases.
@GlobSt = global [10 x i32] zeroinitializer, align 16 ; static initializer
@GlobDy = global [10 x i32] zeroinitializer, align 16 ; dynamic initializer
@GlobEx = external global [10 x i32] , align 16 ; extern initializer
; GlobSt is declared here, and has static initializer -- ok to optimize.
define i32 @AccessGlobSt_0_2() sanitize_address {
entry:
%0 = load i32* getelementptr inbounds ([10 x i32]* @GlobSt, i64 0, i64 2), align 8
ret i32 %0
; CHECK-LABEL: define i32 @AccessGlobSt_0_2
; CHECK-NOT: __asan_report
; CHECK: ret i32 %0
}
; GlobSt is accessed out of bounds -- can't optimize
define i32 @AccessGlobSt_0_12() sanitize_address {
entry:
%0 = load i32* getelementptr inbounds ([10 x i32]* @GlobSt, i64 0, i64 12), align 8
ret i32 %0
; CHECK-LABEL: define i32 @AccessGlobSt_0_12
; CHECK: __asan_report
; CHECK: ret i32
}
; GlobSt is accessed with Gep that has non-0 first index -- can't optimize.
define i32 @AccessGlobSt_1_2() sanitize_address {
entry:
%0 = load i32* getelementptr inbounds ([10 x i32]* @GlobSt, i64 1, i64 2), align 8
ret i32 %0
; CHECK-LABEL: define i32 @AccessGlobSt_1_2
; CHECK: __asan_report
; CHECK: ret i32
}
; GlobDy is declared with dynamic initializer -- can't optimize.
define i32 @AccessGlobDy_0_2() sanitize_address {
entry:
%0 = load i32* getelementptr inbounds ([10 x i32]* @GlobDy, i64 0, i64 2), align 8
ret i32 %0
; CHECK-LABEL: define i32 @AccessGlobDy_0_2
; CHECK: __asan_report
; CHECK: ret i32
}
; GlobEx is an external global -- can't optimize.
define i32 @AccessGlobEx_0_2() sanitize_address {
entry:
%0 = load i32* getelementptr inbounds ([10 x i32]* @GlobEx, i64 0, i64 2), align 8
ret i32 %0
; CHECK-LABEL: define i32 @AccessGlobEx_0_2
; CHECK: __asan_report
; CHECK: ret i32
}
!llvm.asan.dynamically_initialized_globals = !{!0}
!0 = metadata !{[10 x i32]* @GlobDy}
; CHECK-LABEL: define internal void @asan.module_ctor
; CHECK-NOT: ret
; CHECK: call void @__asan_register_globals
; CHECK: ret
; CHECK-LABEL: define internal void @asan.module_dtor
; CHECK-NOT: ret
; CHECK: call void @__asan_unregister_globals
; CHECK: ret