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[XRay] Support DW_TAG_call_site and delete unneeded PATCHABLE_EVENT_CALL/PATCHABLE_TYPED_EVENT_CALL lowering

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This commit is contained in:
Fangrui Song 2021-01-25 00:49:18 -08:00
parent d5bbaaaf95
commit d745b82de1
5 changed files with 35 additions and 49 deletions
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10
llvm/include/llvm/CodeGen/TargetLowering.h
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@ -3117,16 +3117,6 @@ protected:
MachineBasicBlock *emitPatchPoint(MachineInstr &MI,
MachineBasicBlock *MBB) const;
/// Replace/modify the XRay custom event operands with target-dependent
/// details.
MachineBasicBlock *emitXRayCustomEvent(MachineInstr &MI,
MachineBasicBlock *MBB) const;
/// Replace/modify the XRay typed event operands with target-dependent
/// details.
MachineBasicBlock *emitXRayTypedEvent(MachineInstr &MI,
MachineBasicBlock *MBB) const;
bool IsStrictFPEnabled;
};

2
llvm/lib/CodeGen/MachineInstr.cpp
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@ -708,8 +708,6 @@ bool MachineInstr::isCandidateForCallSiteEntry(QueryType Type) const {
if (!isCall(Type))
return false;
switch (getOpcode()) {
case TargetOpcode::PATCHABLE_EVENT_CALL:
case TargetOpcode::PATCHABLE_TYPED_EVENT_CALL:
case TargetOpcode::PATCHPOINT:
case TargetOpcode::STACKMAP:
case TargetOpcode::STATEPOINT:

30
llvm/lib/CodeGen/TargetLoweringBase.cpp
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@ -1227,36 +1227,6 @@ TargetLoweringBase::emitPatchPoint(MachineInstr &InitialMI,
return MBB;
}
MachineBasicBlock *
TargetLoweringBase::emitXRayCustomEvent(MachineInstr &MI,
MachineBasicBlock *MBB) const {
assert(MI.getOpcode() == TargetOpcode::PATCHABLE_EVENT_CALL &&
"Called emitXRayCustomEvent on the wrong MI!");
auto &MF = *MI.getMF();
auto MIB = BuildMI(MF, MI.getDebugLoc(), MI.getDesc());
for (unsigned OpIdx = 0; OpIdx != MI.getNumOperands(); ++OpIdx)
MIB.add(MI.getOperand(OpIdx));
MBB->insert(MachineBasicBlock::iterator(MI), MIB);
MI.eraseFromParent();
return MBB;
}
MachineBasicBlock *
TargetLoweringBase::emitXRayTypedEvent(MachineInstr &MI,
MachineBasicBlock *MBB) const {
assert(MI.getOpcode() == TargetOpcode::PATCHABLE_TYPED_EVENT_CALL &&
"Called emitXRayTypedEvent on the wrong MI!");
auto &MF = *MI.getMF();
auto MIB = BuildMI(MF, MI.getDebugLoc(), MI.getDesc());
for (unsigned OpIdx = 0; OpIdx != MI.getNumOperands(); ++OpIdx)
MIB.add(MI.getOperand(OpIdx));
MBB->insert(MachineBasicBlock::iterator(MI), MIB);
MI.eraseFromParent();
return MBB;
}
/// findRepresentativeClass - Return the largest legal super-reg register class
/// of the register class for the specified type and its associated "cost".
// This function is in TargetLowering because it uses RegClassForVT which would

4
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -33981,10 +33981,8 @@ X86TargetLowering::EmitInstrWithCustomInserter(MachineInstr &MI,
return emitPatchPoint(MI, BB);
case TargetOpcode::PATCHABLE_EVENT_CALL:
return emitXRayCustomEvent(MI, BB);
case TargetOpcode::PATCHABLE_TYPED_EVENT_CALL:
return emitXRayTypedEvent(MI, BB);
return BB;
case X86::LCMPXCHG8B: {
const X86RegisterInfo *TRI = Subtarget.getRegisterInfo();

38
llvm/test/CodeGen/X86/xray-custom-log.ll
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@ -1,12 +1,15 @@
; RUN: llc -verify-machineinstrs -mtriple=x86_64 < %s | FileCheck %s
; RUN: llc -verify-machineinstrs -mtriple=x86_64 -relocation-model=pic < %s | FileCheck %s --check-prefix=PIC
define i32 @customevent() nounwind "function-instrument"="xray-always" {
; RUN: llc -mtriple=x86_64 -filetype=obj %s -o %t
; RUN: llvm-dwarfdump %t | FileCheck %s --check-prefix=DBG
define i32 @customevent() nounwind "function-instrument"="xray-always" !dbg !1 {
%eventptr = alloca i8
%eventsize = alloca i32
store i32 3, i32* %eventsize
%val = load i32, i32* %eventsize
call void @llvm.xray.customevent(i8* %eventptr, i32 %val)
call void @llvm.xray.customevent(i8* %eventptr, i32 %val), !dbg !8
; CHECK-LABEL: Lxray_event_sled_0:
; CHECK: .byte 0xeb, 0x0f
; CHECK-NEXT: pushq %rdi
@ -32,7 +35,7 @@ define i32 @customevent() nounwind "function-instrument"="xray-always" {
; CHECK-LABEL: Lxray_sleds_start0:
; CHECK: .quad {{.*}}xray_event_sled_0
define i32 @typedevent() nounwind "function-instrument"="xray-always" {
define i32 @typedevent() nounwind "function-instrument"="xray-always" !dbg !2 {
%eventptr = alloca i8
%eventsize = alloca i32
%eventtype = alloca i16
@ -40,7 +43,7 @@ define i32 @typedevent() nounwind "function-instrument"="xray-always" {
%type = load i16, i16* %eventtype
store i32 3, i32* %eventsize
%val = load i32, i32* %eventsize
call void @llvm.xray.typedevent(i16 %type, i8* %eventptr, i32 %val)
call void @llvm.xray.typedevent(i16 %type, i8* %eventptr, i32 %val), !dbg !9
; CHECK-LABEL: Lxray_typed_event_sled_0:
; CHECK: .byte 0xeb, 0x14
; CHECK-NEXT: pushq %rdi
@ -74,3 +77,30 @@ define i32 @typedevent() nounwind "function-instrument"="xray-always" {
declare void @llvm.xray.customevent(i8*, i32)
declare void @llvm.xray.typedevent(i16, i8*, i32)
;; Construct call site entries for PATCHABLE_EVENT_CALL.
; DBG: DW_TAG_subprogram
; DBG: DW_TAG_call_site
; DBG-NEXT: DW_AT_call_target (DW_OP_reg{{.*}})
; DBG-NEXT: DW_AT_call_return_pc
; DBG: DW_TAG_subprogram
; DBG: DW_TAG_call_site
; DBG-NEXT: DW_AT_call_target (DW_OP_reg{{.*}})
; DBG-NEXT: DW_AT_call_return_pc
!llvm.dbg.cu = !{!7}
!llvm.module.flags = !{!10, !11}
!1 = distinct !DISubprogram(name: "customevent", scope: !3, file: !3, line: 1, type: !4, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !7)
!2 = distinct !DISubprogram(name: "typedevent", scope: !3, file: !3, line: 3, type: !4, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !7)
!3 = !DIFile(filename: "a.c", directory: "/tmp")
!4 = !DISubroutineType(types: !5)
!5 = !{!6}
!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!7 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
!8 = !DILocation(line: 2, column: 3, scope: !1)
!9 = !DILocation(line: 4, column: 3, scope: !2)
!10 = !{i32 7, !"Dwarf Version", i32 5}
!11 = !{i32 2, !"Debug Info Version", i32 3}