1//=====- NVPTXTargetStreamer.cpp - NVPTXTargetStreamer class ------------=====//
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 implements the NVPTXTargetStreamer class.
10//
11//===----------------------------------------------------------------------===//
12
13#include "NVPTXTargetStreamer.h"
14#include "NVPTXUtilities.h"
15#include "llvm/MC/MCAsmInfo.h"
16#include "llvm/MC/MCContext.h"
17#include "llvm/MC/MCExpr.h"
18#include "llvm/MC/MCObjectFileInfo.h"
19#include "llvm/MC/MCSymbol.h"
20#include "llvm/Support/Casting.h"
21
22using namespace llvm;
23
24//
25// NVPTXTargetStreamer Implemenation
26//
27NVPTXTargetStreamer::NVPTXTargetStreamer(MCStreamer &S) : MCTargetStreamer(S) {}
28NVPTXTargetStreamer::~NVPTXTargetStreamer() = default;
29
30NVPTXAsmTargetStreamer::NVPTXAsmTargetStreamer(MCStreamer &S)
31 : NVPTXTargetStreamer(S) {}
32NVPTXAsmTargetStreamer::~NVPTXAsmTargetStreamer() = default;
33
34void NVPTXTargetStreamer::outputDwarfFileDirectives() {
35 for (const std::string &S : DwarfFiles)
36 getStreamer().emitRawText(String: S);
37 DwarfFiles.clear();
38}
39
40void NVPTXTargetStreamer::closeLastSection() {
41 if (HasSections)
42 getStreamer().emitRawText(String: "\t}");
43}
44
45void NVPTXTargetStreamer::emitDwarfFileDirective(StringRef Directive) {
46 DwarfFiles.emplace_back(Args&: Directive);
47}
48
49static bool isDwarfSection(const MCObjectFileInfo *FI,
50 const MCSection *Section) {
51 // FIXME: the checks for the DWARF sections are very fragile and should be
52 // fixed up in a followup patch.
53 if (!Section || Section->isText())
54 return false;
55 return Section == FI->getDwarfAbbrevSection() ||
56 Section == FI->getDwarfInfoSection() ||
57 Section == FI->getDwarfMacinfoSection() ||
58 Section == FI->getDwarfFrameSection() ||
59 Section == FI->getDwarfAddrSection() ||
60 Section == FI->getDwarfRangesSection() ||
61 Section == FI->getDwarfARangesSection() ||
62 Section == FI->getDwarfLocSection() ||
63 Section == FI->getDwarfStrSection() ||
64 Section == FI->getDwarfLineSection() ||
65 Section == FI->getDwarfStrOffSection() ||
66 Section == FI->getDwarfLineStrSection() ||
67 Section == FI->getDwarfPubNamesSection() ||
68 Section == FI->getDwarfPubTypesSection() ||
69 Section == FI->getDwarfSwiftASTSection() ||
70 Section == FI->getDwarfTypesDWOSection() ||
71 Section == FI->getDwarfAbbrevDWOSection() ||
72 Section == FI->getDwarfAccelObjCSection() ||
73 Section == FI->getDwarfAccelNamesSection() ||
74 Section == FI->getDwarfAccelTypesSection() ||
75 Section == FI->getDwarfAccelNamespaceSection() ||
76 Section == FI->getDwarfLocDWOSection() ||
77 Section == FI->getDwarfStrDWOSection() ||
78 Section == FI->getDwarfCUIndexSection() ||
79 Section == FI->getDwarfInfoDWOSection() ||
80 Section == FI->getDwarfLineDWOSection() ||
81 Section == FI->getDwarfTUIndexSection() ||
82 Section == FI->getDwarfStrOffDWOSection() ||
83 Section == FI->getDwarfDebugNamesSection() ||
84 Section == FI->getDwarfDebugInlineSection() ||
85 Section == FI->getDwarfGnuPubNamesSection() ||
86 Section == FI->getDwarfGnuPubTypesSection();
87}
88
89void NVPTXTargetStreamer::changeSection(const MCSection *CurSection,
90 MCSection *Section, uint32_t SubSection,
91 raw_ostream &OS) {
92 assert(!SubSection && "SubSection is not null!");
93 const MCObjectFileInfo *FI = getStreamer().getContext().getObjectFileInfo();
94 // Emit closing brace for DWARF sections only.
95 if (isDwarfSection(FI, Section: CurSection))
96 OS << "\t}\n";
97 if (isDwarfSection(FI, Section)) {
98 // Emit DWARF .file directives in the outermost scope.
99 outputDwarfFileDirectives();
100 OS << "\t.section";
101 Section->printSwitchToSection(MAI: *getStreamer().getContext().getAsmInfo(),
102 T: getStreamer().getContext().getTargetTriple(),
103 OS, Subsection: SubSection);
104 // DWARF sections are enclosed into braces - emit the open one.
105 OS << "\t{\n";
106 HasSections = true;
107 }
108}
109
110void NVPTXTargetStreamer::emitRawBytes(StringRef Data) {
111 MCTargetStreamer::emitRawBytes(Data);
112 // TODO: enable this once the bug in the ptxas with the packed bytes is
113 // resolved. Currently, (it is confirmed by NVidia) it causes a crash in
114 // ptxas.
115#if 0
116 const MCAsmInfo *MAI = Streamer.getContext().getAsmInfo();
117 const char *Directive = MAI->getData8bitsDirective();
118 unsigned NumElements = Data.size();
119 const unsigned MaxLen = 40;
120 unsigned NumChunks = 1 + ((NumElements - 1) / MaxLen);
121 // Split the very long directives into several parts if the limit is
122 // specified.
123 for (unsigned I = 0; I < NumChunks; ++I) {
124 SmallString<128> Str;
125 raw_svector_ostream OS(Str);
126
127 const char *Label = Directive;
128 for (auto It = std::next(Data.bytes_begin(), I * MaxLen),
129 End = (I == NumChunks - 1)
130 ? Data.bytes_end()
131 : std::next(Data.bytes_begin(), (I + 1) * MaxLen);
132 It != End; ++It) {
133 OS << Label << (unsigned)*It;
134 if (Label == Directive)
135 Label = ",";
136 }
137 Streamer.emitRawText(OS.str());
138 }
139#endif
140}
141
142void NVPTXTargetStreamer::emitValue(const MCExpr *Value) {
143 if (Value->getKind() == MCExpr::SymbolRef) {
144 const MCSymbolRefExpr &SRE = cast<MCSymbolRefExpr>(Val: *Value);
145 StringRef SymName = SRE.getSymbol().getName();
146 if (!SymName.starts_with(Prefix: ".debug")) {
147 Streamer.emitRawText(String: NVPTX::getValidPTXIdentifier(Name: SymName));
148 return;
149 }
150 // Fall through to the normal printing.
151 }
152 // Otherwise, print the Value normally.
153 MCTargetStreamer::emitValue(Value);
154}
155