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llvm-project/llvm/test/Instrumentation/MemorySanitizer/check-constant-shadow.ll

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[NewPM] Port Msan Summary: Keeping msan a function pass requires replacing the module level initialization: That means, don't define a ctor function which calls __msan_init, instead just declare the init function at the first access, and add that to the global ctors list. Changes: - Pull the actual sanitizer and the wrapper pass apart. - Add a newpm msan pass. The function pass inserts calls to runtime library functions, for which it inserts declarations as necessary. - Update tests. Caveats: - There is one test that I dropped, because it specifically tested the definition of the ctor. Reviewers: chandlerc, fedor.sergeev, leonardchan, vitalybuka Subscribers: sdardis, nemanjai, javed.absar, hiraditya, kbarton, bollu, atanasyan, jsji Differential Revision: https://reviews.llvm.org/D55647 llvm-svn: 350305
2019-01-03 21:42:44 +08:00
; RUN: opt < %s -msan-check-access-address=0 -msan-check-constant-shadow=1 \
; RUN: -msan-track-origins=1 -S -passes=msan 2>&1 | FileCheck %s
[msan] Optimize -msan-check-constant-shadow. The new code does not create new basic blocks in the case when shadow is a compile-time constant; it generates either an unconditional __msan_warning call or nothing instead. llvm-svn: 226569
2015-01-20 23:21:35 +08:00
; RUN: opt < %s -msan -msan-check-access-address=0 -msan-check-constant-shadow=1 -msan-track-origins=1 -S | FileCheck %s
[msan] Make -msan-check-constant-shadow a bit stronger. Allow (under the experimental flag) non-Instructions to participate in MSan checks. llvm-svn: 220601
2014-10-25 07:34:15 +08:00
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-S128"
target triple = "x86_64-unknown-linux-gnu"
; Test that returning a literal undef from main() triggers an MSan warning.
[msan] Optimize -msan-check-constant-shadow. The new code does not create new basic blocks in the case when shadow is a compile-time constant; it generates either an unconditional __msan_warning call or nothing instead. llvm-svn: 226569
2015-01-20 23:21:35 +08:00
; main() is special: it inserts check for the return value
[msan] Make -msan-check-constant-shadow a bit stronger. Allow (under the experimental flag) non-Instructions to participate in MSan checks. llvm-svn: 220601
2014-10-25 07:34:15 +08:00
define i32 @main() nounwind uwtable sanitize_memory {
entry:
ret i32 undef
}
; CHECK-LABEL: @main
; CHECK: call void @__msan_warning_noreturn
; CHECK: ret i32 undef
[msan] Optimize -msan-check-constant-shadow. The new code does not create new basic blocks in the case when shadow is a compile-time constant; it generates either an unconditional __msan_warning call or nothing instead. llvm-svn: 226569
2015-01-20 23:21:35 +08:00
; This function stores known initialized value.
; Expect 2 stores: one for the shadow (0), one for the value (42), but no origin.
define void @StoreConstant(i32* nocapture %p) nounwind uwtable sanitize_memory {
entry:
store i32 42, i32* %p, align 4
ret void
}
; CHECK-LABEL: @StoreConstant
; CHECK-NOT: store i32
; CHECK: store i32 0,
; CHECK-NOT: store i32
; CHECK: store i32 42,
; CHECK-NOT: store i32
; CHECK: ret void
; This function stores known uninitialized value.
; Expect 3 stores: shadow, value and origin.
; Expect no icmp(s): everything here is unconditional.
define void @StoreUndef(i32* nocapture %p) nounwind uwtable sanitize_memory {
entry:
store i32 undef, i32* %p, align 4
ret void
}
; CHECK-LABEL: @StoreUndef
; CHECK-NOT: icmp
; CHECK: store i32
; CHECK-NOT: icmp
; CHECK: store i32
; CHECK-NOT: icmp
; CHECK: store i32
; CHECK-NOT: icmp
; CHECK: ret void