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4e50d0475a
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
80 lines
3.0 KiB
LLVM
80 lines
3.0 KiB
LLVM
; RUN: opt < %s -asan -asan-module -asan-stack-dynamic-alloca \
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; RUN: -asan-use-after-return -S | FileCheck %s
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; RUN: opt < %s -asan -asan-module -asan-stack-dynamic-alloca -asan-mapping-scale=5 \
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; RUN: -asan-use-after-return -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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define void @Func1() sanitize_address {
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entry:
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; CHECK-LABEL: Func1
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; CHECK: entry:
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; CHECK: load i32, i32* @__asan_option_detect_stack_use_after_return
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; CHECK: [[UAR_ENABLED_BB:^[0-9]+]]:
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; CHECK: [[FAKE_STACK_RT:%[0-9]+]] = call i64 @__asan_stack_malloc_
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; CHECK: [[FAKE_STACK_BB:^[0-9]+]]:
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; CHECK: [[FAKE_STACK:%[0-9]+]] = phi i64 [ 0, %entry ], [ [[FAKE_STACK_RT]], %[[UAR_ENABLED_BB]] ]
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; CHECK: icmp eq i64 [[FAKE_STACK]], 0
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; CHECK: [[NO_FAKE_STACK_BB:^[0-9]+]]:
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; CHECK: %MyAlloca = alloca i8, i64
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; CHECK: [[ALLOCA:%[0-9]+]] = ptrtoint i8* %MyAlloca
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; CHECK: phi i64 [ [[FAKE_STACK]], %[[FAKE_STACK_BB]] ], [ [[ALLOCA]], %[[NO_FAKE_STACK_BB]] ]
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; CHECK: ret void
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%XXX = alloca [20 x i8], align 1
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%arr.ptr = bitcast [20 x i8]* %XXX to i8*
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store volatile i8 0, i8* %arr.ptr
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ret void
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}
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; Test that dynamic alloca is not used for functions with inline assembly.
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define void @Func2() sanitize_address {
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entry:
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; CHECK-LABEL: Func2
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; CHECK: alloca [96 x i8]
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; CHECK: ret void
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%XXX = alloca [20 x i8], align 1
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%arr.ptr = bitcast [20 x i8]* %XXX to i8*
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store volatile i8 0, i8* %arr.ptr
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call void asm sideeffect "mov %%rbx, %%rcx", "~{dirflag},~{fpsr},~{flags}"() nounwind
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ret void
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}
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; Test that dynamic alloca is not used when setjmp is present.
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%struct.__jmp_buf_tag = type { [8 x i64], i32, %struct.__sigset_t }
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%struct.__sigset_t = type { [16 x i64] }
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@_ZL3buf = internal global [1 x %struct.__jmp_buf_tag] zeroinitializer, align 16
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define void @Func3() uwtable sanitize_address {
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; CHECK-LABEL: define void @Func3
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; CHECK-NOT: __asan_option_detect_stack_use_after_return
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; CHECK-NOT: __asan_stack_malloc
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; CHECK: call void @__asan_handle_no_return
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; CHECK: call void @longjmp
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; CHECK: ret void
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entry:
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%a = alloca i32, align 4
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%call = call i32 @_setjmp(%struct.__jmp_buf_tag* getelementptr inbounds ([1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* @_ZL3buf, i32 0, i32 0)) nounwind returns_twice
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%cmp = icmp eq i32 0, %call
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br i1 %cmp, label %if.then, label %if.end
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if.then: ; preds = %entry
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call void @longjmp(%struct.__jmp_buf_tag* getelementptr inbounds ([1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* @_ZL3buf, i32 0, i32 0), i32 1) noreturn nounwind
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unreachable
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if.end: ; preds = %entry
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call void @_Z10escape_ptrPi(i32* %a)
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ret void
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}
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declare i32 @_setjmp(%struct.__jmp_buf_tag*) nounwind returns_twice
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declare void @longjmp(%struct.__jmp_buf_tag*, i32) noreturn nounwind
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declare void @_Z10escape_ptrPi(i32*)
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