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[XRay][AArch64] Implemented a test for the compile-time sleds emitted, and fixed a bug in the jump instruction

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This patch adds a test for the assembly code emitted with XRay
instrumentation. It also fixes a bug where the operand of a jump
instruction must be not the number of bytes to jump over, but rather the
number of 4-byte instructions.

Author: rSerge

Reviewers: dberris, rengolin

Differential Revision: https://reviews.llvm.org/D26805

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287516 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dean Michael Berris 2016-11-21 03:01:43 +00:00
parent 02ca2cb0e6
commit 4fedda5369
2 changed files with 35 additions and 1 deletions
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4
lib/Target/AArch64/AArch64AsmPrinter.cpp
View File

@ -223,7 +223,9 @@ void AArch64AsmPrinter::EmitSled(const MachineInstr &MI, SledKind Kind)
auto Target = OutContext.createTempSymbol();
// Emit "B #32" instruction, which jumps over the next 28 bytes.
EmitToStreamer(*OutStreamer, MCInstBuilder(AArch64::B).addImm(32));
// The operand has to be the number of 4-byte instructions to jump over,
// including the current instruction.
EmitToStreamer(*OutStreamer, MCInstBuilder(AArch64::B).addImm(8));
for (int8_t I = 0; I < NoopsInSledCount; I++)
EmitToStreamer(*OutStreamer, MCInstBuilder(AArch64::HINT).addImm(0));

32
test/CodeGen/AArch64/xray-attribute-instrumentation.ll Normal file
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@ -0,0 +1,32 @@
; 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: Lxray_sled_0:
; 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: Ltmp0:
ret i32 0
; CHECK-LABEL: Lxray_sled_1:
; 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: Ltmp1:
; CHECK-NEXT: ret
}
; CHECK: .p2align 4
; CHECK-NEXT: .xword .Lxray_synthetic_0
; CHECK-NEXT: .section xray_instr_map,{{.*}}
; CHECK-LABEL: Lxray_synthetic_0:
; CHECK: .xword .Lxray_sled_0
; CHECK: .xword .Lxray_sled_1