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[xray] Honor xray-never function-instrument attribute

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function-instrument=xray-never wasn't actually honored before. We were
getting lucky that it worked because CodeGenFunction would omit the
other xray attributes when a function was annotated with
xray_never_instrument. This patch adds proper support.

Differential Revision: https://reviews.llvm.org/D89441
This commit is contained in:
Ian Levesque 2020-10-14 22:18:30 -04:00
parent 6e11fd80e6
commit cb3e4b9e0e
2 changed files with 77 additions and 0 deletions
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4
lib/CodeGen/XRayInstrumentation.cpp
View File

@ -147,6 +147,10 @@ bool XRayInstrumentation::runOnMachineFunction(MachineFunction &MF) {
auto InstrAttr = F.getFnAttribute("function-instrument");
bool AlwaysInstrument = InstrAttr.isStringAttribute() &&
InstrAttr.getValueAsString() == "xray-always";
bool NeverInstrument = InstrAttr.isStringAttribute() &&
InstrAttr.getValueAsString() == "xray-never";
if (NeverInstrument && !AlwaysInstrument)
return false;
auto ThresholdAttr = F.getFnAttribute("xray-instruction-threshold");
auto IgnoreLoopsAttr = F.getFnAttribute("xray-ignore-loops");
unsigned int XRayThreshold = 0;

73
test/CodeGen/AArch64/xray-attribute-instrumentation.ll
View File

@ -1,6 +1,7 @@
; RUN: llc -filetype=asm -o - -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s
define i32 @foo() nounwind noinline uwtable "function-instrument"="xray-always" {
; CHECK-LABEL: foo:
; CHECK-LABEL: Lxray_sled_0:
; CHECK-NEXT: b #32
; CHECK-NEXT: nop
@ -24,8 +25,80 @@ define i32 @foo() nounwind noinline uwtable "function-instrument"="xray-always"
; CHECK-LABEL: Ltmp1:
; CHECK-NEXT: ret
}
; CHECK-LABEL: xray_instr_map
; CHECK-LABEL: Lxray_sleds_start0
; CHECK: .xword .Lxray_sled_0
; CHECK: .xword .Lxray_sled_1
; CHECK-LABEL: Lxray_sleds_end0
define i32 @bar() nounwind noinline uwtable "function-instrument"="xray-never" "function-instrument"="xray-always" {
; CHECK-LABEL: bar:
; CHECK-LABEL: Lxray_sled_2:
; CHECK-NEXT: b #32
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-LABEL: Ltmp4:
ret i32 0
; CHECK-LABEL: Lxray_sled_3:
; CHECK-NEXT: b #32
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-LABEL: Ltmp5:
; CHECK-NEXT: ret
}
; CHECK-LABEL: xray_instr_map
; CHECK-LABEL: Lxray_sleds_start1
; CHECK: .xword .Lxray_sled_2
; CHECK: .xword .Lxray_sled_3
; CHECK-LABEL: Lxray_sleds_end1
define i32 @instrumented() nounwind noinline uwtable "xray-instruction-threshold"="1" {
; CHECK-LABEL: instrumented:
; CHECK-LABEL: Lxray_sled_4:
; CHECK-NEXT: b #32
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-LABEL: Ltmp8:
ret i32 0
; CHECK-LABEL: Lxray_sled_5:
; CHECK-NEXT: b #32
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-LABEL: Ltmp9:
; CHECK-NEXT: ret
}
; CHECK-LABEL: xray_instr_map
; CHECK-LABEL: Lxray_sleds_start2
; CHECK: .xword .Lxray_sled_4
; CHECK: .xword .Lxray_sled_5
; CHECK-LABEL: Lxray_sleds_end2
define i32 @not_instrumented() nounwind noinline uwtable "xray-instruction-threshold"="1" "function-instrument"="xray-never" {
; CHECK-LABEL: not_instrumented
; CHECK-NOT: .Lxray_sled_6
ret i32 0
; CHECK: ret
}