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65df098609
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
56 lines
1.6 KiB
LLVM
56 lines
1.6 KiB
LLVM
; RUN: opt < %s -msan-check-access-address=0 -msan-check-constant-shadow=1 \
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; RUN: -msan-track-origins=1 -S -passes=msan 2>&1 | FileCheck %s
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; RUN: opt < %s -msan -msan-check-access-address=0 -msan-check-constant-shadow=1 -msan-track-origins=1 -S | FileCheck %s
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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"
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target triple = "x86_64-unknown-linux-gnu"
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; Test that returning a literal undef from main() triggers an MSan warning.
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; main() is special: it inserts check for the return value
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define i32 @main() nounwind uwtable sanitize_memory {
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entry:
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ret i32 undef
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}
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; CHECK-LABEL: @main
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; CHECK: call void @__msan_warning_noreturn
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; CHECK: ret i32 undef
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; This function stores known initialized value.
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; Expect 2 stores: one for the shadow (0), one for the value (42), but no origin.
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define void @StoreConstant(i32* nocapture %p) nounwind uwtable sanitize_memory {
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entry:
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store i32 42, i32* %p, align 4
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ret void
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}
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; CHECK-LABEL: @StoreConstant
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; CHECK-NOT: store i32
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; CHECK: store i32 0,
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; CHECK-NOT: store i32
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; CHECK: store i32 42,
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; CHECK-NOT: store i32
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; CHECK: ret void
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; This function stores known uninitialized value.
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; Expect 3 stores: shadow, value and origin.
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; Expect no icmp(s): everything here is unconditional.
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define void @StoreUndef(i32* nocapture %p) nounwind uwtable sanitize_memory {
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entry:
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store i32 undef, i32* %p, align 4
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ret void
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}
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; CHECK-LABEL: @StoreUndef
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; CHECK-NOT: icmp
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; CHECK: store i32
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; CHECK-NOT: icmp
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; CHECK: store i32
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; CHECK-NOT: icmp
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; CHECK: store i32
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; CHECK-NOT: icmp
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; CHECK: ret void
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