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llvm-mirror/test/Instrumentation/MemorySanitizer/msan_kernel_basic.ll
James Y Knight 4e50d0475a IR: Support parsing numeric block ids, and emit them in textual output. 
Just as as llvm IR supports explicitly specifying numeric value ids
for instructions, and emits them by default in textual output, now do
the same for blocks.

This is a slightly incompatible change in the textual IR format.

Previously, llvm would parse numeric labels as string names. E.g.
  define void @f() {
    br label %"55"
  55:
    ret void
  }
defined a label *named* "55", even without needing to be quoted, while
the reference required quoting. Now, if you intend a block label which
looks like a value number to be a name, you must quote it in the
definition too (e.g. `"55":`).

Previously, llvm would print nameless blocks only as a comment, and
would omit it if there was no predecessor. This could cause confusion
for readers of the IR, just as unnamed instructions did prior to the
addition of "%5 = " syntax, back in 2008 (PR2480).

Now, it will always print a label for an unnamed block, with the
exception of the entry block. (IMO it may be better to print it for
the entry-block as well. However, that requires updating many more
tests.)

Thus, the following is supported, and is the canonical printing:
  define i32 @f(i32, i32) {
    %3 = add i32 %0, %1
    br label %4

  4:
    ret i32 %3
  }

New test cases covering this behavior are added, and other tests
updated as required.

Differential Revision: https://reviews.llvm.org/D58548

llvm-svn: 356789
2019-03-22 18:27:13 +00:00

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; KMSAN instrumentation tests
; RUN: opt < %s -msan-kernel=1 -S -passes=msan 2>&1 | FileCheck %s \
; RUN: -check-prefixes=CHECK
; RUN: opt < %s -msan -msan-kernel=1 -S | FileCheck %s -check-prefixes=CHECK
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"
; Check the instrumentation prologue.
define void @Empty() nounwind uwtable sanitize_memory {
entry:
ret void
}
; CHECK-LABEL: @Empty
; CHECK: entry:
; CHECK: @__msan_get_context_state()
; %param_shadow:
; CHECK: getelementptr {{.*}} i32 0, i32 0
; %retval_shadow:
; CHECK: getelementptr {{.*}} i32 0, i32 1
; %va_arg_shadow:
; CHECK: getelementptr {{.*}} i32 0, i32 2
; %va_arg_origin:
; CHECK: getelementptr {{.*}} i32 0, i32 3
; %va_arg_overflow_size:
; CHECK: getelementptr {{.*}} i32 0, i32 4
; %param_origin:
; CHECK: getelementptr {{.*}} i32 0, i32 5
; %retval_origin:
; CHECK: getelementptr {{.*}} i32 0, i32 6
; CHECK: entry.split:
; Check instrumentation of stores
define void @Store1(i8* nocapture %p, i8 %x) nounwind uwtable sanitize_memory {
entry:
store i8 %x, i8* %p
ret void
}
; CHECK-LABEL: @Store1
; CHECK: entry:
; CHECK: @__msan_get_context_state()
; CHECK: [[PARAM_SHADOW:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 0
; CHECK: entry.split:
; CHECK: [[BASE2:%[0-9]+]] = ptrtoint {{.*}} [[PARAM_SHADOW]]
; CHECK: [[BASE:%[0-9]+]] = ptrtoint {{.*}} [[PARAM_SHADOW]]
; CHECK: [[SHADOW:%[a-z0-9_]+]] = inttoptr {{.*}} [[BASE]]
; Load the shadow of %p and check it
; CHECK: load i64, i64* [[SHADOW]]
; CHECK: icmp
; CHECK: br i1
; CHECK: {{^[0-9]+}}:
; CHECK: @__msan_metadata_ptr_for_store_1(i8* %p)
; CHECK: store i8
; If the new shadow is non-zero, jump to __msan_chain_origin()
; CHECK: icmp
; CHECK: br i1
; CHECK: {{^[0-9]+}}:
; CHECK: @__msan_chain_origin
; Storing origin here:
; CHECK: store i32
; CHECK: br label
; CHECK: {{^[0-9]+}}:
; CHECK: store i8
; CHECK: ret void
define void @Store2(i16* nocapture %p, i16 %x) nounwind uwtable sanitize_memory {
entry:
store i16 %x, i16* %p
ret void
}
; CHECK-LABEL: @Store2
; CHECK: entry:
; CHECK: @__msan_get_context_state()
; CHECK: [[PARAM_SHADOW:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 0
; CHECK: entry.split:
; CHECK: ptrtoint {{.*}} [[PARAM_SHADOW]]
; Load the shadow of %p and check it
; CHECK: load i64
; CHECK: icmp
; CHECK: br i1
; CHECK: {{^[0-9]+}}:
; CHECK: [[REG:%[0-9]+]] = bitcast i16* %p to i8*
; CHECK: @__msan_metadata_ptr_for_store_2(i8* [[REG]])
; CHECK: store i16
; If the new shadow is non-zero, jump to __msan_chain_origin()
; CHECK: icmp
; CHECK: br i1
; CHECK: {{^[0-9]+}}:
; CHECK: @__msan_chain_origin
; Storing origin here:
; CHECK: store i32
; CHECK: br label
; CHECK: {{^[0-9]+}}:
; CHECK: store i16
; CHECK: ret void
define void @Store4(i32* nocapture %p, i32 %x) nounwind uwtable sanitize_memory {
entry:
store i32 %x, i32* %p
ret void
}
; CHECK-LABEL: @Store4
; CHECK: entry:
; CHECK: @__msan_get_context_state()
; CHECK: [[PARAM_SHADOW:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 0
; CHECK: entry.split:
; CHECK: ptrtoint {{.*}} [[PARAM_SHADOW]]
; Load the shadow of %p and check it
; CHECK: load i32
; CHECK: icmp
; CHECK: br i1
; CHECK: {{^[0-9]+}}:
; CHECK: [[REG:%[0-9]+]] = bitcast i32* %p to i8*
; CHECK: @__msan_metadata_ptr_for_store_4(i8* [[REG]])
; CHECK: store i32
; If the new shadow is non-zero, jump to __msan_chain_origin()
; CHECK: icmp
; CHECK: br i1
; CHECK: {{^[0-9]+}}:
; CHECK: @__msan_chain_origin
; Storing origin here:
; CHECK: store i32
; CHECK: br label
; CHECK: {{^[0-9]+}}:
; CHECK: store i32
; CHECK: ret void
define void @Store8(i64* nocapture %p, i64 %x) nounwind uwtable sanitize_memory {
entry:
store i64 %x, i64* %p
ret void
}
; CHECK-LABEL: @Store8
; CHECK: entry:
; CHECK: @__msan_get_context_state()
; CHECK: [[PARAM_SHADOW:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 0
; CHECK: entry.split:
; CHECK: ptrtoint {{.*}} [[PARAM_SHADOW]]
; Load the shadow of %p and check it
; CHECK: load i64
; CHECK: icmp
; CHECK: br i1
; CHECK: {{^[0-9]+}}:
; CHECK: [[REG:%[0-9]+]] = bitcast i64* %p to i8*
; CHECK: @__msan_metadata_ptr_for_store_8(i8* [[REG]])
; CHECK: store i64
; If the new shadow is non-zero, jump to __msan_chain_origin()
; CHECK: icmp
; CHECK: br i1
; CHECK: {{^[0-9]+}}:
; CHECK: @__msan_chain_origin
; Storing origin here:
; CHECK: store i32
; CHECK: br label
; CHECK: {{^[0-9]+}}:
; CHECK: store i64
; CHECK: ret void
define void @Store16(i128* nocapture %p, i128 %x) nounwind uwtable sanitize_memory {
entry:
store i128 %x, i128* %p
ret void
}
; CHECK-LABEL: @Store16
; CHECK: entry:
; CHECK: @__msan_get_context_state()
; CHECK: [[PARAM_SHADOW:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 0
; CHECK: entry.split:
; CHECK: ptrtoint {{.*}} [[PARAM_SHADOW]]
; Load the shadow of %p and check it
; CHECK: load i64
; CHECK: icmp
; CHECK: br i1
; CHECK: {{^[0-9]+}}:
; CHECK: [[REG:%[0-9]+]] = bitcast i128* %p to i8*
; CHECK: @__msan_metadata_ptr_for_store_n(i8* [[REG]], i64 16)
; CHECK: store i128
; If the new shadow is non-zero, jump to __msan_chain_origin()
; CHECK: icmp
; CHECK: br i1
; CHECK: {{^[0-9]+}}:
; CHECK: @__msan_chain_origin
; Storing origin here:
; CHECK: store i32
; CHECK: br label
; CHECK: {{^[0-9]+}}:
; CHECK: store i128
; CHECK: ret void
; Check instrumentation of loads
define i8 @Load1(i8* nocapture %p) nounwind uwtable sanitize_memory {
entry:
%0 = load i8, i8* %p
ret i8 %0
}
; CHECK-LABEL: @Load1
; CHECK: entry:
; CHECK: @__msan_get_context_state()
; CHECK: [[PARAM_SHADOW:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 0
; CHECK: entry.split:
; CHECK: ptrtoint {{.*}} [[PARAM_SHADOW]]
; Load the shadow of %p and check it
; CHECK: load i64
; CHECK: icmp
; CHECK: br i1
; CHECK: {{^[0-9]+}}:
; Load the value from %p. This is done before accessing the shadow
; to ease atomic handling.
; CHECK: load i8
; CHECK: @__msan_metadata_ptr_for_load_1(i8* %p)
; Load the shadow and origin.
; CHECK: load i8
; CHECK: load i32
define i16 @Load2(i16* nocapture %p) nounwind uwtable sanitize_memory {
entry:
%0 = load i16, i16* %p
ret i16 %0
}
; CHECK-LABEL: @Load2
; CHECK: entry:
; CHECK: @__msan_get_context_state()
; CHECK: [[PARAM_SHADOW:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 0
; CHECK: entry.split:
; CHECK: ptrtoint {{.*}} [[PARAM_SHADOW]]
; Load the shadow of %p and check it
; CHECK: load i64
; CHECK: icmp
; CHECK: br i1
; CHECK: {{^[0-9]+}}:
; Load the value from %p. This is done before accessing the shadow
; to ease atomic handling.
; CHECK: load i16
; CHECK: [[REG:%[0-9]+]] = bitcast i16* %p to i8*
; CHECK: @__msan_metadata_ptr_for_load_2(i8* [[REG]])
; Load the shadow and origin.
; CHECK: load i16
; CHECK: load i32
define i32 @Load4(i32* nocapture %p) nounwind uwtable sanitize_memory {
entry:
%0 = load i32, i32* %p
ret i32 %0
}
; CHECK-LABEL: @Load4
; CHECK: entry:
; CHECK: @__msan_get_context_state()
; CHECK: [[PARAM_SHADOW:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 0
; CHECK: entry.split:
; CHECK: ptrtoint {{.*}} [[PARAM_SHADOW]]
; Load the shadow of %p and check it
; CHECK: load i64
; CHECK: icmp
; CHECK: br i1
; CHECK: {{^[0-9]+}}:
; Load the value from %p. This is done before accessing the shadow
; to ease atomic handling.
; CHECK: load i32
; CHECK: [[REG:%[0-9]+]] = bitcast i32* %p to i8*
; CHECK: @__msan_metadata_ptr_for_load_4(i8* [[REG]])
; Load the shadow and origin.
; CHECK: load i32
; CHECK: load i32
define i64 @Load8(i64* nocapture %p) nounwind uwtable sanitize_memory {
entry:
%0 = load i64, i64* %p
ret i64 %0
}
; CHECK-LABEL: @Load8
; CHECK: entry:
; CHECK: @__msan_get_context_state()
; CHECK: [[PARAM_SHADOW:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 0
; CHECK: entry.split:
; CHECK: ptrtoint {{.*}} [[PARAM_SHADOW]]
; Load the shadow of %p and check it
; CHECK: load i64
; CHECK: icmp
; CHECK: br i1
; CHECK: {{^[0-9]+}}:
; Load the value from %p. This is done before accessing the shadow
; to ease atomic handling.
; CHECK: load i64
; CHECK: [[REG:%[0-9]+]] = bitcast i64* %p to i8*
; CHECK: @__msan_metadata_ptr_for_load_8(i8* [[REG]])
; Load the shadow and origin.
; CHECK: load i64
; CHECK: load i32
define i128 @Load16(i128* nocapture %p) nounwind uwtable sanitize_memory {
entry:
%0 = load i128, i128* %p
ret i128 %0
}
; CHECK-LABEL: @Load16
; CHECK: entry:
; CHECK: @__msan_get_context_state()
; CHECK: [[PARAM_SHADOW:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 0
; CHECK: entry.split:
; CHECK: ptrtoint {{.*}} [[PARAM_SHADOW]]
; Load the shadow of %p and check it
; CHECK: load i64
; CHECK: icmp
; CHECK: br i1
; CHECK: {{^[0-9]+}}:
; Load the value from %p. This is done before accessing the shadow
; to ease atomic handling.
; CHECK: load i128
; CHECK: [[REG:%[0-9]+]] = bitcast i128* %p to i8*
; CHECK: @__msan_metadata_ptr_for_load_n(i8* [[REG]], i64 16)
; Load the shadow and origin.
; CHECK: load i128
; CHECK: load i32
; Test kernel-specific va_list instrumentation
%struct.__va_list_tag = type { i32, i32, i8*, i8* }
declare void @llvm.va_start(i8*) nounwind
declare void @llvm.va_end(i8*)
@.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
declare dso_local i32 @VAListFn(i8*, %struct.__va_list_tag*) local_unnamed_addr
; Function Attrs: nounwind uwtable
define dso_local i32 @VarArgFn(i8* %fmt, ...) local_unnamed_addr sanitize_memory #0 {
entry:
%args = alloca [1 x %struct.__va_list_tag], align 16
%0 = bitcast [1 x %struct.__va_list_tag]* %args to i8*
%arraydecay = getelementptr inbounds [1 x %struct.__va_list_tag], [1 x %struct.__va_list_tag]* %args, i64 0, i64 0
call void @llvm.va_start(i8* nonnull %0)
%call = call i32 @VAListFn(i8* %fmt, %struct.__va_list_tag* nonnull %arraydecay)
call void @llvm.va_end(i8* nonnull %0)
ret i32 %call
}
; Kernel is built without SSE support.
attributes #0 = { "target-features"="+fxsr,+x87,-sse" }
; CHECK-LABEL: @VarArgFn
; CHECK: @__msan_get_context_state()
; CHECK: [[VA_ARG_SHADOW:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 2
; CHECK: [[VA_ARG_ORIGIN:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 3
; CHECK: [[VA_ARG_OVERFLOW_SIZE:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 4
; CHECK: entry.split:
; CHECK: [[OSIZE:%[0-9]+]] = load i64, i64* [[VA_ARG_OVERFLOW_SIZE]]
; Register save area is 48 bytes for non-SSE builds.
; CHECK: [[SIZE:%[0-9]+]] = add i64 48, [[OSIZE]]
; CHECK: [[SHADOWS:%[0-9]+]] = alloca i8, i64 [[SIZE]]
; CHECK: [[VA_ARG_SHADOW]]
; CHECK: call void @llvm.memcpy{{.*}}(i8* align 8 [[SHADOWS]], {{.*}}, i64 [[SIZE]]
; CHECK: [[ORIGINS:%[0-9]+]] = alloca i8, i64 [[SIZE]]
; CHECK: [[VA_ARG_ORIGIN]]
; CHECK: call void @llvm.memcpy{{.*}}(i8* align 8 [[ORIGINS]], {{.*}}, i64 [[SIZE]]
; CHECK: call i32 @VAListFn
; Function Attrs: nounwind uwtable
define dso_local void @VarArgCaller() local_unnamed_addr sanitize_memory {
entry:
%call = tail call i32 (i8*, ...) @VarArgFn(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 123)
ret void
}
; CHECK-LABEL: @VarArgCaller
; CHECK: entry:
; CHECK: @__msan_get_context_state()
; CHECK: [[PARAM_SHADOW:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 0
; CHECK: [[VA_ARG_SHADOW:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 2
; CHECK: [[VA_ARG_OVERFLOW_SIZE:%[a-z0-9_]+]] = getelementptr {{.*}} i32 0, i32 4
; CHECK: entry.split:
; CHECK: [[PARAM_SI:%[_a-z0-9]+]] = ptrtoint {{.*}} [[PARAM_SHADOW]]
; CHECK: [[ARG1_S:%[_a-z0-9]+]] = inttoptr i64 [[PARAM_SI]] to i64*
; First argument is initialized
; CHECK: store i64 0, i64* [[ARG1_S]]
; Dangling cast of va_arg_shadow[0], unused because the first argument is fixed.
; CHECK: [[VA_CAST0:%[_a-z0-9]+]] = ptrtoint {{.*}} [[VA_ARG_SHADOW]] to i64
; CHECK: [[VA_CAST1:%[_a-z0-9]+]] = ptrtoint {{.*}} [[VA_ARG_SHADOW]] to i64
; CHECK: [[ARG1_SI:%[_a-z0-9]+]] = add i64 [[VA_CAST1]], 8
; CHECK: [[PARG1_S:%[_a-z0-9]+]] = inttoptr i64 [[ARG1_SI]] to i32*
; Shadow for 123 is 0.
; CHECK: store i32 0, i32* [[ARG1_S]]
; CHECK: store i64 0, i64* [[VA_ARG_OVERFLOW_SIZE]]
; CHECK: call i32 (i8*, ...) @VarArgFn({{.*}} @.str{{.*}} i32 123)
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