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c0e6b8ac3a
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
44 lines
1.5 KiB
LLVM
44 lines
1.5 KiB
LLVM
; This check verifies that stack depth instrumentation works correctly.
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; RUN: opt < %s -sancov -sanitizer-coverage-level=1 \
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; RUN: -sanitizer-coverage-stack-depth -S | FileCheck %s
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; RUN: opt < %s -sancov -sanitizer-coverage-level=3 \
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; RUN: -sanitizer-coverage-stack-depth -sanitizer-coverage-trace-pc-guard \
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; RUN: -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; CHECK: @__sancov_lowest_stack = thread_local(initialexec) global i64 -1
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@__sancov_lowest_stack = thread_local global i64 0, align 8
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define i32 @foo() {
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entry:
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; CHECK-LABEL: define i32 @foo
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; CHECK-NOT: call i8* @llvm.frameaddress(i32 0)
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; CHECK-NOT: @__sancov_lowest_stack
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; CHECK: ret i32 7
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ret i32 7
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}
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define i32 @bar() {
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entry:
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; CHECK-LABEL: define i32 @bar
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; CHECK: [[framePtr:%[^ \t]+]] = call i8* @llvm.frameaddress(i32 0)
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; CHECK: [[frameInt:%[^ \t]+]] = ptrtoint i8* [[framePtr]] to [[intType:i[0-9]+]]
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; CHECK: [[lowest:%[^ \t]+]] = load [[intType]], [[intType]]* @__sancov_lowest_stack
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; CHECK: [[cmp:%[^ \t]+]] = icmp ult [[intType]] [[frameInt]], [[lowest]]
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; CHECK: br i1 [[cmp]], label %[[ifLabel:[^ \t]+]], label
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; CHECK: [[ifLabel]]:
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; CHECK: store [[intType]] [[frameInt]], [[intType]]* @__sancov_lowest_stack
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; CHECK: %call = call i32 @foo()
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; CHECK: ret i32 %call
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%call = call i32 @foo()
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ret i32 %call
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}
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define weak_odr hidden i64* @_ZTW21__sancov_lowest_stack() {
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ret i64* @__sancov_lowest_stack
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}
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