LLVM 20.0.0git
PseudoProbePrinter.cpp
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1//===- llvm/CodeGen/PseudoProbePrinter.cpp - Pseudo Probe Emission -------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file contains support for writing pseudo probe info into asm files.
10//
11//===----------------------------------------------------------------------===//
12
13#include "PseudoProbePrinter.h"
16#include "llvm/IR/Function.h"
17#include "llvm/IR/PseudoProbe.h"
19#include "llvm/MC/MCStreamer.h"
20
21using namespace llvm;
22
25 const DILocation *DebugLoc) {
26 // Gather all the inlined-at nodes.
27 // When it's done ReversedInlineStack looks like ([66, B], [88, A])
28 // which means, Function A inlines function B at calliste with a probe id 88,
29 // and B inlines C at probe 66 where C is represented by Guid.
30 SmallVector<InlineSite, 8> ReversedInlineStack;
31 auto *InlinedAt = DebugLoc ? DebugLoc->getInlinedAt() : nullptr;
32 while (InlinedAt) {
33 auto Name = InlinedAt->getSubprogramLinkageName();
34 // Use caching to avoid redundant md5 computation for build speed.
35 uint64_t &CallerGuid = NameGuidMap[Name];
36 if (!CallerGuid)
37 CallerGuid = Function::getGUID(Name);
39 InlinedAt->getDiscriminator());
40 ReversedInlineStack.emplace_back(CallerGuid, CallerProbeId);
41 InlinedAt = InlinedAt->getInlinedAt();
42 }
43 uint64_t Discriminator = 0;
44 // For now only block probes have FS discriminators. See
45 // MIRFSDiscriminator.cpp for more details.
48 Discriminator = DebugLoc->getDiscriminator();
49 assert((EnableFSDiscriminator || Discriminator == 0) &&
50 "Discriminator should not be set in non-FSAFDO mode");
51 SmallVector<InlineSite, 8> InlineStack(llvm::reverse(ReversedInlineStack));
52 Asm->OutStreamer->emitPseudoProbe(Guid, Index, Type, Attr, Discriminator,
53 InlineStack, Asm->CurrentFnSym);
54}
std::string Name
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
MCSymbol * CurrentFnSym
The symbol for the current function.
Definition: AsmPrinter.h:123
std::unique_ptr< MCStreamer > OutStreamer
This is the MCStreamer object for the file we are generating.
Definition: AsmPrinter.h:101
Debug location.
A debug info location.
Definition: DebugLoc.h:33
GUID getGUID() const
Return a 64-bit global unique ID constructed from global value name (i.e.
Definition: GlobalValue.h:595
void emitPseudoProbe(uint64_t Guid, uint64_t Index, uint64_t Type, uint64_t Attr, const DILocation *DebugLoc)
reference emplace_back(ArgTypes &&... Args)
Definition: SmallVector.h:951
This is a 'vector' (really, a variable-sized array), optimized for the case when the array is small.
Definition: SmallVector.h:1210
The instances of the Type class are immutable: once they are created, they are never changed.
Definition: Type.h:45
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
cl::opt< bool > EnableFSDiscriminator
auto reverse(ContainerTy &&C)
Definition: STLExtras.h:419
static uint32_t extractProbeIndex(uint32_t Value)
Definition: PseudoProbe.h:74