83 lines
3.6 KiB
LLVM
83 lines
3.6 KiB
LLVM
; RUN: opt < %s -S -passes=msan 2>&1 | FileCheck %s
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; RUN: opt < %s -msan -S | FileCheck %s
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target datalayout = "e-m:m-i8:8:32-i16:16:32-i64:64-n32:64-S128"
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target triple = "mips64el--linux"
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define i32 @foo(i32 %guard, ...) {
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%vl = alloca i8*, align 8
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%1 = bitcast i8** %vl to i8*
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call void @llvm.lifetime.start.p0i8(i64 32, i8* %1)
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call void @llvm.va_start(i8* %1)
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call void @llvm.va_end(i8* %1)
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call void @llvm.lifetime.end.p0i8(i64 32, i8* %1)
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ret i32 0
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}
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; First, check allocation of the save area.
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; CHECK-LABEL: @foo
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; CHECK: [[A:%.*]] = load {{.*}} @__msan_va_arg_overflow_size_tls
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; CHECK: [[B:%.*]] = add i64 0, [[A]]
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; CHECK: [[C:%.*]] = alloca {{.*}} [[B]]
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; CHECK: [[STACK:%.*]] = bitcast {{.*}} @__msan_va_arg_tls to i8*
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; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 [[C]], i8* align 8 [[STACK]], i64 [[B]], i1 false)
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
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declare void @llvm.va_start(i8*) #2
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declare void @llvm.va_end(i8*) #2
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
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define i32 @bar() {
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%1 = call i32 (i32, ...) @foo(i32 0, i32 1, i64 2, double 3.000000e+00)
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ret i32 %1
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}
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; Save the incoming shadow value from the arguments in the __msan_va_arg_tls
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; array.
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; CHECK-LABEL: @bar
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; CHECK: store i32 0, i32* bitcast ([100 x i64]* @__msan_va_arg_tls to i32*), align 8
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; CHECK: store i64 0, i64* inttoptr (i64 add (i64 ptrtoint ([100 x i64]* @__msan_va_arg_tls to i64), i64 8) to i64*), align 8
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; CHECK: store i64 0, i64* inttoptr (i64 add (i64 ptrtoint ([100 x i64]* @__msan_va_arg_tls to i64), i64 16) to i64*), align 8
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; CHECK: store {{.*}} 24, {{.*}} @__msan_va_arg_overflow_size_tls
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; Check multiple fixed arguments.
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declare i32 @foo2(i32 %g1, i32 %g2, ...)
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define i32 @bar2() {
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%1 = call i32 (i32, i32, ...) @foo2(i32 0, i32 1, i64 2, double 3.000000e+00)
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ret i32 %1
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}
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; CHECK-LABEL: @bar2
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; CHECK: store i64 0, i64* getelementptr inbounds ([100 x i64], [100 x i64]* @__msan_va_arg_tls, i32 0, i32 0), align 8
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; CHECK: store i64 0, i64* inttoptr (i64 add (i64 ptrtoint ([100 x i64]* @__msan_va_arg_tls to i64), i64 8) to i64*), align 8
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; CHECK: store {{.*}} 16, {{.*}} @__msan_va_arg_overflow_size_tls
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; Test that MSan doesn't generate code overflowing __msan_va_arg_tls when too many arguments are
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; passed to a variadic function.
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define dso_local i64 @many_args() {
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entry:
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%ret = call i64 (i64, ...) @sum(i64 120,
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i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
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i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
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i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
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i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
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i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
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i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
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i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
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i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
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i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
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i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
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i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
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i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1
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)
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ret i64 %ret
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}
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; If the size of __msan_va_arg_tls changes the second argument of `add` must also be changed.
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; CHECK-LABEL: @many_args
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; CHECK: i64 add (i64 ptrtoint ([100 x i64]* @__msan_va_arg_tls to i64), i64 792)
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; CHECK-NOT: i64 add (i64 ptrtoint ([100 x i64]* @__msan_va_arg_tls to i64), i64 800)
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declare i64 @sum(i64 %n, ...)
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