282 lines
8.0 KiB
LLVM
282 lines
8.0 KiB
LLVM
; RUN: llc -verify-machineinstrs -mtriple=x86_64-unknown -mattr=+lvi-cfi < %s | FileCheck %s --check-prefix=X64
|
|
; RUN: llc -verify-machineinstrs -mtriple=x86_64-unknown -mattr=+lvi-cfi -O0 < %s | FileCheck %s --check-prefix=X64FAST
|
|
;
|
|
; Note that a lot of this code was lifted from retpoline.ll.
|
|
|
|
declare dso_local void @bar(i32)
|
|
|
|
; Test a simple indirect call and tail call.
|
|
define void @icall_reg(void (i32)* %fp, i32 %x) {
|
|
entry:
|
|
tail call void @bar(i32 %x)
|
|
tail call void %fp(i32 %x)
|
|
tail call void @bar(i32 %x)
|
|
tail call void %fp(i32 %x)
|
|
ret void
|
|
}
|
|
|
|
; X64-LABEL: icall_reg:
|
|
; X64-DAG: movq %rdi, %[[fp:[^ ]*]]
|
|
; X64-DAG: movl %esi, %[[x:[^ ]*]]
|
|
; X64: movl %esi, %edi
|
|
; X64: callq bar
|
|
; X64-DAG: movl %[[x]], %edi
|
|
; X64-DAG: movq %[[fp]], %r11
|
|
; X64: callq __llvm_lvi_thunk_r11
|
|
; X64: movl %[[x]], %edi
|
|
; X64: callq bar
|
|
; X64-DAG: movl %[[x]], %edi
|
|
; X64-DAG: movq %[[fp]], %r11
|
|
; X64: jmp __llvm_lvi_thunk_r11 # TAILCALL
|
|
|
|
; X64FAST-LABEL: icall_reg:
|
|
; X64FAST: callq bar
|
|
; X64FAST: callq __llvm_lvi_thunk_r11
|
|
; X64FAST: callq bar
|
|
; X64FAST: jmp __llvm_lvi_thunk_r11 # TAILCALL
|
|
|
|
|
|
@global_fp = external dso_local global void (i32)*
|
|
|
|
; Test an indirect call through a global variable.
|
|
define void @icall_global_fp(i32 %x, void (i32)** %fpp) #0 {
|
|
%fp1 = load void (i32)*, void (i32)** @global_fp
|
|
call void %fp1(i32 %x)
|
|
%fp2 = load void (i32)*, void (i32)** @global_fp
|
|
tail call void %fp2(i32 %x)
|
|
ret void
|
|
}
|
|
|
|
; X64-LABEL: icall_global_fp:
|
|
; X64-DAG: movl %edi, %[[x:[^ ]*]]
|
|
; X64-DAG: movq global_fp(%rip), %r11
|
|
; X64: callq __llvm_lvi_thunk_r11
|
|
; X64-DAG: movl %[[x]], %edi
|
|
; X64-DAG: movq global_fp(%rip), %r11
|
|
; X64: jmp __llvm_lvi_thunk_r11 # TAILCALL
|
|
|
|
; X64FAST-LABEL: icall_global_fp:
|
|
; X64FAST: movq global_fp(%rip), %r11
|
|
; X64FAST: callq __llvm_lvi_thunk_r11
|
|
; X64FAST: movq global_fp(%rip), %r11
|
|
; X64FAST: jmp __llvm_lvi_thunk_r11 # TAILCALL
|
|
|
|
|
|
%struct.Foo = type { void (%struct.Foo*)** }
|
|
|
|
; Test an indirect call through a vtable.
|
|
define void @vcall(%struct.Foo* %obj) #0 {
|
|
%vptr_field = getelementptr %struct.Foo, %struct.Foo* %obj, i32 0, i32 0
|
|
%vptr = load void (%struct.Foo*)**, void (%struct.Foo*)*** %vptr_field
|
|
%vslot = getelementptr void(%struct.Foo*)*, void(%struct.Foo*)** %vptr, i32 1
|
|
%fp = load void(%struct.Foo*)*, void(%struct.Foo*)** %vslot
|
|
tail call void %fp(%struct.Foo* %obj)
|
|
tail call void %fp(%struct.Foo* %obj)
|
|
ret void
|
|
}
|
|
|
|
; X64-LABEL: vcall:
|
|
; X64: movq %rdi, %[[obj:[^ ]*]]
|
|
; X64: movq (%rdi), %[[vptr:[^ ]*]]
|
|
; X64: movq 8(%[[vptr]]), %[[fp:[^ ]*]]
|
|
; X64: movq %[[fp]], %r11
|
|
; X64: callq __llvm_lvi_thunk_r11
|
|
; X64-DAG: movq %[[obj]], %rdi
|
|
; X64-DAG: movq %[[fp]], %r11
|
|
; X64: jmp __llvm_lvi_thunk_r11 # TAILCALL
|
|
|
|
; X64FAST-LABEL: vcall:
|
|
; X64FAST: callq __llvm_lvi_thunk_r11
|
|
; X64FAST: jmp __llvm_lvi_thunk_r11 # TAILCALL
|
|
|
|
|
|
declare dso_local void @direct_callee()
|
|
|
|
define void @direct_tail() #0 {
|
|
tail call void @direct_callee()
|
|
ret void
|
|
}
|
|
|
|
; X64-LABEL: direct_tail:
|
|
; X64: jmp direct_callee # TAILCALL
|
|
; X64FAST-LABEL: direct_tail:
|
|
; X64FAST: jmp direct_callee # TAILCALL
|
|
|
|
|
|
declare void @nonlazybind_callee() #1
|
|
|
|
define void @nonlazybind_caller() #0 {
|
|
call void @nonlazybind_callee()
|
|
tail call void @nonlazybind_callee()
|
|
ret void
|
|
}
|
|
|
|
; X64-LABEL: nonlazybind_caller:
|
|
; X64: movq nonlazybind_callee@GOTPCREL(%rip), %[[REG:.*]]
|
|
; X64: movq %[[REG]], %r11
|
|
; X64: callq __llvm_lvi_thunk_r11
|
|
; X64: movq %[[REG]], %r11
|
|
; X64: jmp __llvm_lvi_thunk_r11 # TAILCALL
|
|
; X64FAST-LABEL: nonlazybind_caller:
|
|
; X64FAST: movq nonlazybind_callee@GOTPCREL(%rip), %r11
|
|
; X64FAST: callq __llvm_lvi_thunk_r11
|
|
; X64FAST: movq nonlazybind_callee@GOTPCREL(%rip), %r11
|
|
; X64FAST: jmp __llvm_lvi_thunk_r11 # TAILCALL
|
|
|
|
|
|
; Check that a switch gets lowered using a jump table
|
|
define void @switch_jumptable(i32* %ptr, i64* %sink) #0 {
|
|
; X64-LABEL: switch_jumptable:
|
|
; X64_NOT: jmpq *
|
|
entry:
|
|
br label %header
|
|
|
|
header:
|
|
%i = load volatile i32, i32* %ptr
|
|
switch i32 %i, label %bb0 [
|
|
i32 1, label %bb1
|
|
i32 2, label %bb2
|
|
i32 3, label %bb3
|
|
i32 4, label %bb4
|
|
i32 5, label %bb5
|
|
i32 6, label %bb6
|
|
i32 7, label %bb7
|
|
i32 8, label %bb8
|
|
i32 9, label %bb9
|
|
]
|
|
|
|
bb0:
|
|
store volatile i64 0, i64* %sink
|
|
br label %header
|
|
|
|
bb1:
|
|
store volatile i64 1, i64* %sink
|
|
br label %header
|
|
|
|
bb2:
|
|
store volatile i64 2, i64* %sink
|
|
br label %header
|
|
|
|
bb3:
|
|
store volatile i64 3, i64* %sink
|
|
br label %header
|
|
|
|
bb4:
|
|
store volatile i64 4, i64* %sink
|
|
br label %header
|
|
|
|
bb5:
|
|
store volatile i64 5, i64* %sink
|
|
br label %header
|
|
|
|
bb6:
|
|
store volatile i64 6, i64* %sink
|
|
br label %header
|
|
|
|
bb7:
|
|
store volatile i64 7, i64* %sink
|
|
br label %header
|
|
|
|
bb8:
|
|
store volatile i64 8, i64* %sink
|
|
br label %header
|
|
|
|
bb9:
|
|
store volatile i64 9, i64* %sink
|
|
br label %header
|
|
}
|
|
|
|
|
|
@indirectbr_rewrite.targets = constant [10 x i8*] [i8* blockaddress(@indirectbr_rewrite, %bb0),
|
|
i8* blockaddress(@indirectbr_rewrite, %bb1),
|
|
i8* blockaddress(@indirectbr_rewrite, %bb2),
|
|
i8* blockaddress(@indirectbr_rewrite, %bb3),
|
|
i8* blockaddress(@indirectbr_rewrite, %bb4),
|
|
i8* blockaddress(@indirectbr_rewrite, %bb5),
|
|
i8* blockaddress(@indirectbr_rewrite, %bb6),
|
|
i8* blockaddress(@indirectbr_rewrite, %bb7),
|
|
i8* blockaddress(@indirectbr_rewrite, %bb8),
|
|
i8* blockaddress(@indirectbr_rewrite, %bb9)]
|
|
|
|
; Check that when thunks are enabled the indirectbr instruction gets
|
|
; rewritten to use switch, and that in turn doesn't get lowered as a jump
|
|
; table.
|
|
define void @indirectbr_rewrite(i64* readonly %p, i64* %sink) #0 {
|
|
; X64-LABEL: indirectbr_rewrite:
|
|
; X64-NOT: jmpq *
|
|
entry:
|
|
%i0 = load i64, i64* %p
|
|
%target.i0 = getelementptr [10 x i8*], [10 x i8*]* @indirectbr_rewrite.targets, i64 0, i64 %i0
|
|
%target0 = load i8*, i8** %target.i0
|
|
indirectbr i8* %target0, [label %bb1, label %bb3]
|
|
|
|
bb0:
|
|
store volatile i64 0, i64* %sink
|
|
br label %latch
|
|
|
|
bb1:
|
|
store volatile i64 1, i64* %sink
|
|
br label %latch
|
|
|
|
bb2:
|
|
store volatile i64 2, i64* %sink
|
|
br label %latch
|
|
|
|
bb3:
|
|
store volatile i64 3, i64* %sink
|
|
br label %latch
|
|
|
|
bb4:
|
|
store volatile i64 4, i64* %sink
|
|
br label %latch
|
|
|
|
bb5:
|
|
store volatile i64 5, i64* %sink
|
|
br label %latch
|
|
|
|
bb6:
|
|
store volatile i64 6, i64* %sink
|
|
br label %latch
|
|
|
|
bb7:
|
|
store volatile i64 7, i64* %sink
|
|
br label %latch
|
|
|
|
bb8:
|
|
store volatile i64 8, i64* %sink
|
|
br label %latch
|
|
|
|
bb9:
|
|
store volatile i64 9, i64* %sink
|
|
br label %latch
|
|
|
|
latch:
|
|
%i.next = load i64, i64* %p
|
|
%target.i.next = getelementptr [10 x i8*], [10 x i8*]* @indirectbr_rewrite.targets, i64 0, i64 %i.next
|
|
%target.next = load i8*, i8** %target.i.next
|
|
; Potentially hit a full 10 successors here so that even if we rewrite as
|
|
; a switch it will try to be lowered with a jump table.
|
|
indirectbr i8* %target.next, [label %bb0,
|
|
label %bb1,
|
|
label %bb2,
|
|
label %bb3,
|
|
label %bb4,
|
|
label %bb5,
|
|
label %bb6,
|
|
label %bb7,
|
|
label %bb8,
|
|
label %bb9]
|
|
}
|
|
|
|
; Lastly check that the necessary thunks were emitted.
|
|
;
|
|
; X64-LABEL: .section .text.__llvm_lvi_thunk_r11,{{.*}},__llvm_lvi_thunk_r11,comdat
|
|
; X64-NEXT: .hidden __llvm_lvi_thunk_r11
|
|
; X64-NEXT: .weak __llvm_lvi_thunk_r11
|
|
; X64: __llvm_lvi_thunk_r11:
|
|
; X64-NEXT: # {{.*}} # %entry
|
|
; X64-NEXT: lfence
|
|
; X64-NEXT: jmpq *%r11
|
|
|
|
attributes #1 = { nonlazybind }
|