f9fd0062b6
`__xray_customevent` and `__xray_typedevent` are built-in functions in Clang.
With -fxray-instrument, they are lowered to intrinsics llvm.xray.customevent and
llvm.xray.typedevent, respectively. These intrinsics are then lowered to
TargetOpcode::{PATCHABLE_EVENT_CALL,PATCHABLE_TYPED_EVENT_CALL}. The target is
responsible for generating a code sequence that calls either
`__xray_CustomEvent` (with 2 arguments) or `__xray_TypedEvent` (with 3
arguments).
Before patching, the code sequence is prefixed by a branch instruction that
skips the rest of the code sequence. After patching
(compiler-rt/lib/xray/xray_AArch64.cpp), the branch instruction becomes a NOP
and the function call will take effects.
This patch implements the lowering process for
{PATCHABLE_EVENT_CALL,PATCHABLE_TYPED_EVENT_CALL} and implements the runtime.
```
// Lowering of PATCHABLE_EVENT_CALL
.Lxray_sled_N:
b #24
stp x0, x1, [sp, #-16]!
x0 = reg of op0
x1 = reg of op1
bl __xray_CustomEvent
ldrp x0, x1, [sp], #16
```
As a result, two updated tests in compiler-rt/test/xray/TestCases/Posix/ now
pass on AArch64.
Reviewed By: peter.smith
Differential Revision: https://reviews.llvm.org/D153320
135 lines
6.0 KiB
LLVM
135 lines
6.0 KiB
LLVM
; RUN: llc -mtriple=aarch64 < %s | FileCheck %s
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; RUN: llc -mtriple=arm64-apple-darwin < %s | FileCheck %s --check-prefix=MACHO
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; RUN: llc -filetype=obj -mtriple=aarch64 %s -o %t
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; RUN: llvm-dwarfdump -debug-info %t | FileCheck %s --check-prefix=DBG
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; MACHO: bl ___xray_CustomEvent
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; MACHO: bl ___xray_CustomEvent
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; MACHO: bl ___xray_TypedEvent
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; MACHO: bl ___xray_TypedEvent
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; CHECK-LABEL: customevent:
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; CHECK: Lxray_sled_1:
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; CHECK-NEXT: b #24 // Begin XRay custom event
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; CHECK-NEXT: stp x0, x1, [sp, #-16]!
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; CHECK-NEXT: mov x0, x0
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; CHECK-NEXT: mov x1, x1
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; CHECK-NEXT: bl __xray_CustomEvent
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; CHECK-NEXT: ldp x0, x1, [sp], #16 // End XRay custom event
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; CHECK-NEXT: Ltmp[[#]]:
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; CHECK-NEXT: .loc 0 3 3 // a.c:3:3
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; CHECK-NEXT: Lxray_sled_2:
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; CHECK-NEXT: b #24 // Begin XRay custom event
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; CHECK-NEXT: stp x0, x1, [sp, #-16]!
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; CHECK-NEXT: mov x0, x2
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; CHECK-NEXT: mov x1, x3
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; CHECK-NEXT: bl __xray_CustomEvent
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; CHECK-NEXT: ldp x0, x1, [sp], #16 // End XRay custom event
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; CHECK-NEXT: .Ltmp[[#]]:
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; CHECK-NEXT: .loc 0 4 1 // a.c:4:1
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define void @customevent(ptr nocapture noundef readonly %e1, i64 noundef %s1, ptr nocapture noundef readonly %e2, i64 noundef %s2) "function-instrument"="xray-always" !dbg !11 {
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entry:
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tail call void @llvm.xray.customevent(ptr %e1, i64 %s1), !dbg !22
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tail call void @llvm.xray.customevent(ptr %e2, i64 %s2), !dbg !23
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ret void, !dbg !24
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}
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; CHECK: .xword .Lxray_sled_1-.Ltmp[[#]]
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; CHECK-NEXT: .xword .Lfunc_begin0-(.Ltmp[[#]]+8)
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; CHECK-NEXT: .byte 0x04
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; CHECK-NEXT: .byte 0x01
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; CHECK-NEXT: .byte 0x02
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; CHECK-NEXT: .zero 13
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; CHECK: .xword .Lxray_sled_2-.Ltmp[[#]]
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; CHECK-NEXT: .xword .Lfunc_begin0-(.Ltmp[[#]]+8)
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; CHECK-NEXT: .byte 0x04
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; CHECK-NEXT: .byte 0x01
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; CHECK-NEXT: .byte 0x02
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; CHECK-NEXT: .zero 13
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; CHECK-LABEL: typedevent:
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; CHECK: .Lxray_sled_5:
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; CHECK-NEXT: b #36 // Begin XRay typed event
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; CHECK-NEXT: stp x0, x1, [sp, #-32]!
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; CHECK-NEXT: str x2, [sp, #16]
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; CHECK-NEXT: mov x0, x0
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; CHECK-NEXT: mov x1, x1
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; CHECK-NEXT: mov x2, x2
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; CHECK-NEXT: bl __xray_TypedEvent
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; CHECK-NEXT: ldr x2, [sp, #16]
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; CHECK-NEXT: ldp x0, x1, [sp], #32 // End XRay typed event
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; CHECK-NEXT: .Ltmp[[#]]:
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; CHECK-NEXT: .loc 0 8 3 // a.c:8:3
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; CHECK-NEXT: .Lxray_sled_6:
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; CHECK-NEXT: b #36 // Begin XRay typed event
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; CHECK-NEXT: stp x0, x1, [sp, #-32]!
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; CHECK-NEXT: str x2, [sp, #16]
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; CHECK-NEXT: mov x0, x2
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; CHECK-NEXT: mov x1, x1
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; CHECK-NEXT: mov x2, x0
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; CHECK-NEXT: bl __xray_TypedEvent
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; CHECK-NEXT: ldr x2, [sp, #16]
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; CHECK-NEXT: ldp x0, x1, [sp], #32 // End XRay typed event
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; CHECK-NEXT: .Ltmp[[#]]:
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; CHECK-NEXT: .loc 0 9 1 // a.c:9:1
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define void @typedevent(i64 noundef %type, ptr nocapture noundef readonly %event, i64 noundef %size) "function-instrument"="xray-always" !dbg !25 {
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entry:
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tail call void @llvm.xray.typedevent(i64 %type, ptr %event, i64 %size), !dbg !33
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tail call void @llvm.xray.typedevent(i64 %size, ptr %event, i64 %type), !dbg !34
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ret void, !dbg !35
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}
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; CHECK: .xword .Lxray_sled_5-.Ltmp[[#]]
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; CHECK-NEXT: .xword .Lfunc_begin1-(.Ltmp[[#]]+8)
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; CHECK-NEXT: .byte 0x05
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; CHECK-NEXT: .byte 0x01
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; CHECK-NEXT: .byte 0x02
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; CHECK-NEXT: .zero 13
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; CHECK: .xword .Lxray_sled_6-.Ltmp[[#]]
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; CHECK-NEXT: .xword .Lfunc_begin1-(.Ltmp[[#]]+8)
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; CHECK-NEXT: .byte 0x05
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; CHECK-NEXT: .byte 0x01
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; CHECK-NEXT: .byte 0x02
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; CHECK-NEXT: .zero 13
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;; Construct call site entries for PATCHABLE_EVENT_CALL.
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; DBG: DW_TAG_subprogram
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; DBG: DW_AT_name
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; DBG-SAME: ("customevent")
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; DBG: DW_TAG_call_site
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; DBG-NEXT: DW_AT_call_target (DW_OP_reg0 {{.*}})
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; DBG-NEXT: DW_AT_call_return_pc
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; DBG-EMPTY:
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; DBG: DW_TAG_call_site
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; DBG-NEXT: DW_AT_call_target (DW_OP_reg2 {{.*}})
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; DBG-NEXT: DW_AT_call_return_pc
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declare void @llvm.xray.customevent(ptr, i64)
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declare void @llvm.xray.typedevent(i64, ptr, i64)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2, !3}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang version 17.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "a.c", directory: "/tmp")
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!2 = !{i32 7, !"Dwarf Version", i32 5}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !{!"clang version 17.0.0"}
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!11 = distinct !DISubprogram(name: "customevent", scope: !1, file: !1, line: 1, type: !12, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
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!12 = !DISubroutineType(types: !13)
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!13 = !{null, !14, !15, !14, !15}
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!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
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!15 = !DIBasicType(name: "unsigned long", size: 64, encoding: DW_ATE_unsigned)
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!21 = !DILocation(line: 0, scope: !11)
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!22 = !DILocation(line: 2, column: 3, scope: !11)
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!23 = !DILocation(line: 3, column: 3, scope: !11)
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!24 = !DILocation(line: 4, column: 1, scope: !11)
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!25 = distinct !DISubprogram(name: "typedevent", scope: !1, file: !1, line: 6, type: !26, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
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!26 = !DISubroutineType(types: !27)
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!27 = !{null, !15, !14, !15}
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!32 = !DILocation(line: 0, scope: !25)
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!33 = !DILocation(line: 7, column: 3, scope: !25)
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!34 = !DILocation(line: 8, column: 3, scope: !25)
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!35 = !DILocation(line: 9, column: 1, scope: !25)
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