Bug Summary

File:llvm/lib/Target/Hexagon/HexagonTargetObjectFile.cpp
Warning:line 144, column 24
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name HexagonTargetObjectFile.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/lib/Target/Hexagon -resource-dir /usr/lib/llvm-14/lib/clang/14.0.0 -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/lib/Target/Hexagon -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/llvm/lib/Target/Hexagon -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/include -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/llvm/include -D NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-14/lib/clang/14.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/lib/Target/Hexagon -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e=. -ferror-limit 19 -fvisibility hidden -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2021-09-04-040900-46481-1 -x c++ /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/llvm/lib/Target/Hexagon/HexagonTargetObjectFile.cpp
1//===-- HexagonTargetObjectFile.cpp ---------------------------------------===//
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 the declarations of the HexagonTargetAsmInfo properties.
10//
11//===----------------------------------------------------------------------===//
12
13#include "HexagonTargetObjectFile.h"
14#include "llvm/ADT/SmallString.h"
15#include "llvm/ADT/StringRef.h"
16#include "llvm/ADT/Twine.h"
17#include "llvm/BinaryFormat/ELF.h"
18#include "llvm/IR/DataLayout.h"
19#include "llvm/IR/DerivedTypes.h"
20#include "llvm/IR/GlobalObject.h"
21#include "llvm/IR/GlobalValue.h"
22#include "llvm/IR/GlobalVariable.h"
23#include "llvm/IR/Module.h"
24#include "llvm/IR/Type.h"
25#include "llvm/MC/MCContext.h"
26#include "llvm/MC/SectionKind.h"
27#include "llvm/Support/Casting.h"
28#include "llvm/Support/CommandLine.h"
29#include "llvm/Support/Debug.h"
30#include "llvm/Support/raw_ostream.h"
31#include "llvm/Target/TargetMachine.h"
32
33#define DEBUG_TYPE"hexagon-sdata" "hexagon-sdata"
34
35using namespace llvm;
36
37static cl::opt<unsigned> SmallDataThreshold("hexagon-small-data-threshold",
38 cl::init(8), cl::Hidden,
39 cl::desc("The maximum size of an object in the sdata section"));
40
41static cl::opt<bool> NoSmallDataSorting("mno-sort-sda", cl::init(false),
42 cl::Hidden, cl::desc("Disable small data sections sorting"));
43
44static cl::opt<bool> StaticsInSData("hexagon-statics-in-small-data",
45 cl::init(false), cl::Hidden, cl::ZeroOrMore,
46 cl::desc("Allow static variables in .sdata"));
47
48static cl::opt<bool> TraceGVPlacement("trace-gv-placement",
49 cl::Hidden, cl::init(false),
50 cl::desc("Trace global value placement"));
51
52static cl::opt<bool>
53 EmitJtInText("hexagon-emit-jt-text", cl::Hidden, cl::init(false),
54 cl::desc("Emit hexagon jump tables in function section"));
55
56static cl::opt<bool>
57 EmitLutInText("hexagon-emit-lut-text", cl::Hidden, cl::init(false),
58 cl::desc("Emit hexagon lookup tables in function section"));
59
60// TraceGVPlacement controls messages for all builds. For builds with assertions
61// (debug or release), messages are also controlled by the usual debug flags
62// (e.g. -debug and -debug-only=globallayout)
63#define TRACE_TO(s, X)s << X s << X
64#ifdef NDEBUG1
65#define TRACE(X)do { if (TraceGVPlacement) { errs() << X; } } while (false
) \
66 do { \
67 if (TraceGVPlacement) { \
68 TRACE_TO(errs(), X)errs() << X; \
69 } \
70 } while (false)
71#else
72#define TRACE(X)do { if (TraceGVPlacement) { errs() << X; } } while (false
) \
73 do { \
74 if (TraceGVPlacement) { \
75 TRACE_TO(errs(), X)errs() << X; \
76 } else { \
77 LLVM_DEBUG(TRACE_TO(dbgs(), X))do { } while (false); \
78 } \
79 } while (false)
80#endif
81
82// Returns true if the section name is such that the symbol will be put
83// in a small data section.
84// For instance, global variables with section attributes such as ".sdata"
85// ".sdata.*", ".sbss", and ".sbss.*" will go into small data.
86static bool isSmallDataSection(StringRef Sec) {
87 // sectionName is either ".sdata" or ".sbss". Looking for an exact match
88 // obviates the need for checks for section names such as ".sdatafoo".
89 if (Sec.equals(".sdata") || Sec.equals(".sbss") || Sec.equals(".scommon"))
90 return true;
91 // If either ".sdata." or ".sbss." is a substring of the section name
92 // then put the symbol in small data.
93 return Sec.find(".sdata.") != StringRef::npos ||
94 Sec.find(".sbss.") != StringRef::npos ||
95 Sec.find(".scommon.") != StringRef::npos;
96}
97
98static const char *getSectionSuffixForSize(unsigned Size) {
99 switch (Size) {
100 default:
101 return "";
102 case 1:
103 return ".1";
104 case 2:
105 return ".2";
106 case 4:
107 return ".4";
108 case 8:
109 return ".8";
110 }
111}
112
113void HexagonTargetObjectFile::Initialize(MCContext &Ctx,
114 const TargetMachine &TM) {
115 TargetLoweringObjectFileELF::Initialize(Ctx, TM);
116
117 SmallDataSection =
118 getContext().getELFSection(".sdata", ELF::SHT_PROGBITS,
119 ELF::SHF_WRITE | ELF::SHF_ALLOC |
120 ELF::SHF_HEX_GPREL);
121 SmallBSSSection =
122 getContext().getELFSection(".sbss", ELF::SHT_NOBITS,
123 ELF::SHF_WRITE | ELF::SHF_ALLOC |
124 ELF::SHF_HEX_GPREL);
125}
126
127MCSection *HexagonTargetObjectFile::SelectSectionForGlobal(
128 const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
129 TRACE("[SelectSectionForGlobal] GO(" << GO->getName() << ") ")do { if (TraceGVPlacement) { errs() << "[SelectSectionForGlobal] GO("
<< GO->getName() << ") "; } } while (false);
1
Assuming the condition is false
→
2
←
Taking false branch
→
3
←
Loop condition is false. Exiting loop
→
19
←
Assuming the condition is false
→
20
←
Taking false branch
→
21
←
Loop condition is false. Exiting loop
→
130 TRACE("input section(" << GO->getSection() << ") ")do { if (TraceGVPlacement) { errs() << "input section("
<< GO->getSection() << ") "; } } while (false
);
4
←
Taking false branch
→
5
←
Loop condition is false. Exiting loop
→
22
←
Taking false branch
→
23
←
Loop condition is false. Exiting loop
→
131
132 TRACE((GO->hasPrivateLinkage() ? "private_linkage " : "")do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
6
←
Taking false branch
→
24
←
Taking false branch
→
133 << (GO->hasLocalLinkage() ? "local_linkage " : "")do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
134 << (GO->hasInternalLinkage() ? "internal " : "")do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
135 << (GO->hasExternalLinkage() ? "external " : "")do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
136 << (GO->hasCommonLinkage() ? "common_linkage " : "")do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
137 << (GO->hasCommonLinkage() ? "common " : "" )do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
138 << (Kind.isCommon() ? "kind_common " : "" )do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
139 << (Kind.isBSS() ? "kind_bss " : "" )do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
140 << (Kind.isBSSLocal() ? "kind_bss_local " : "" ))do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false);
141
142 // If the lookup table is used by more than one function, do not place
143 // it in text section.
144 if (EmitLutInText && GO->getName().startswith("switch.table")) {
7
←
Assuming the condition is true
→
8
←
Assuming the condition is true
→
9
←
Taking true branch
→
25
←
Assuming the condition is true
→
26
←
Called C++ object pointer is null
145 if (const Function *Fn = getLutUsedFunction(GO))
10
←
Assuming 'Fn' is non-null
→
11
←
Taking true branch
→
146 return selectSectionForLookupTable(GO, TM, Fn);
12
←
Calling 'HexagonTargetObjectFile::selectSectionForLookupTable'
→
147 }
148
149 if (isGlobalInSmallSection(GO, TM))
150 return selectSmallSectionForGlobal(GO, Kind, TM);
151
152 if (Kind.isCommon()) {
153 // This is purely for LTO+Linker Script because commons don't really have a
154 // section. However, the BitcodeSectionWriter pass will query for the
155 // sections of commons (and the linker expects us to know their section) so
156 // we'll return one here.
157 return BSSSection;
158 }
159
160 TRACE("default_ELF_section\n")do { if (TraceGVPlacement) { errs() << "default_ELF_section\n"
; } } while (false);
161 // Otherwise, we work the same as ELF.
162 return TargetLoweringObjectFileELF::SelectSectionForGlobal(GO, Kind, TM);
163}
164
165MCSection *HexagonTargetObjectFile::getExplicitSectionGlobal(
166 const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
167 TRACE("[getExplicitSectionGlobal] GO(" << GO->getName() << ") from("do { if (TraceGVPlacement) { errs() << "[getExplicitSectionGlobal] GO("
<< GO->getName() << ") from(" << GO->
getSection() << ") "; } } while (false)
168 << GO->getSection() << ") ")do { if (TraceGVPlacement) { errs() << "[getExplicitSectionGlobal] GO("
<< GO->getName() << ") from(" << GO->
getSection() << ") "; } } while (false);
169 TRACE((GO->hasPrivateLinkage() ? "private_linkage " : "")do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
170 << (GO->hasLocalLinkage() ? "local_linkage " : "")do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
171 << (GO->hasInternalLinkage() ? "internal " : "")do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
172 << (GO->hasExternalLinkage() ? "external " : "")do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
173 << (GO->hasCommonLinkage() ? "common_linkage " : "")do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
174 << (GO->hasCommonLinkage() ? "common " : "" )do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
175 << (Kind.isCommon() ? "kind_common " : "" )do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
176 << (Kind.isBSS() ? "kind_bss " : "" )do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false)
177 << (Kind.isBSSLocal() ? "kind_bss_local " : "" ))do { if (TraceGVPlacement) { errs() << (GO->hasPrivateLinkage
() ? "private_linkage " : "") << (GO->hasLocalLinkage
() ? "local_linkage " : "") << (GO->hasInternalLinkage
() ? "internal " : "") << (GO->hasExternalLinkage() ?
"external " : "") << (GO->hasCommonLinkage() ? "common_linkage "
: "") << (GO->hasCommonLinkage() ? "common " : "" )
<< (Kind.isCommon() ? "kind_common " : "" ) << (
Kind.isBSS() ? "kind_bss " : "" ) << (Kind.isBSSLocal()
? "kind_bss_local " : "" ); } } while (false);
178
179 if (GO->hasSection()) {
180 StringRef Section = GO->getSection();
181 if (Section.find(".access.text.group") != StringRef::npos)
182 return getContext().getELFSection(GO->getSection(), ELF::SHT_PROGBITS,
183 ELF::SHF_ALLOC | ELF::SHF_EXECINSTR);
184 if (Section.find(".access.data.group") != StringRef::npos)
185 return getContext().getELFSection(GO->getSection(), ELF::SHT_PROGBITS,
186 ELF::SHF_WRITE | ELF::SHF_ALLOC);
187 }
188
189 if (isGlobalInSmallSection(GO, TM))
190 return selectSmallSectionForGlobal(GO, Kind, TM);
191
192 // Otherwise, we work the same as ELF.
193 TRACE("default_ELF_section\n")do { if (TraceGVPlacement) { errs() << "default_ELF_section\n"
; } } while (false);
194 return TargetLoweringObjectFileELF::getExplicitSectionGlobal(GO, Kind, TM);
195}
196
197/// Return true if this global value should be placed into small data/bss
198/// section.
199bool HexagonTargetObjectFile::isGlobalInSmallSection(const GlobalObject *GO,
200 const TargetMachine &TM) const {
201 bool HaveSData = isSmallDataEnabled(TM);
202 if (!HaveSData)
203 LLVM_DEBUG(dbgs() << "Small-data allocation is disabled, but symbols "do { } while (false)
204 "may have explicit section assignments...\n")do { } while (false);
205 // Only global variables, not functions.
206 LLVM_DEBUG(dbgs() << "Checking if value is in small-data, -G"do { } while (false)
207 << SmallDataThreshold << ": \"" << GO->getName() << "\": ")do { } while (false);
208 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GO);
209 if (!GVar) {
210 LLVM_DEBUG(dbgs() << "no, not a global variable\n")do { } while (false);
211 return false;
212 }
213
214 // Globals with external linkage that have an original section set must be
215 // emitted to that section, regardless of whether we would put them into
216 // small data or not. This is how we can support mixing -G0/-G8 in LTO.
217 if (GVar->hasSection()) {
218 bool IsSmall = isSmallDataSection(GVar->getSection());
219 LLVM_DEBUG(dbgs() << (IsSmall ? "yes" : "no")do { } while (false)
220 << ", has section: " << GVar->getSection() << '\n')do { } while (false);
221 return IsSmall;
222 }
223
224 // If sdata is disabled, stop the checks here.
225 if (!HaveSData) {
226 LLVM_DEBUG(dbgs() << "no, small-data allocation is disabled\n")do { } while (false);
227 return false;
228 }
229
230 if (GVar->isConstant()) {
231 LLVM_DEBUG(dbgs() << "no, is a constant\n")do { } while (false);
232 return false;
233 }
234
235 bool IsLocal = GVar->hasLocalLinkage();
236 if (!StaticsInSData && IsLocal) {
237 LLVM_DEBUG(dbgs() << "no, is static\n")do { } while (false);
238 return false;
239 }
240
241 Type *GType = GVar->getValueType();
242 if (isa<ArrayType>(GType)) {
243 LLVM_DEBUG(dbgs() << "no, is an array\n")do { } while (false);
244 return false;
245 }
246
247 // If the type is a struct with no body provided, treat is conservatively.
248 // There cannot be actual definitions of object of such a type in this CU
249 // (only references), so assuming that they are not in sdata is safe. If
250 // these objects end up in the sdata, the references will still be valid.
251 if (StructType *ST = dyn_cast<StructType>(GType)) {
252 if (ST->isOpaque()) {
253 LLVM_DEBUG(dbgs() << "no, has opaque type\n")do { } while (false);
254 return false;
255 }
256 }
257
258 unsigned Size = GVar->getParent()->getDataLayout().getTypeAllocSize(GType);
259 if (Size == 0) {
260 LLVM_DEBUG(dbgs() << "no, has size 0\n")do { } while (false);
261 return false;
262 }
263 if (Size > SmallDataThreshold) {
264 LLVM_DEBUG(dbgs() << "no, size exceeds sdata threshold: " << Size << '\n')do { } while (false);
265 return false;
266 }
267
268 LLVM_DEBUG(dbgs() << "yes\n")do { } while (false);
269 return true;
270}
271
272bool HexagonTargetObjectFile::isSmallDataEnabled(const TargetMachine &TM)
273 const {
274 return SmallDataThreshold > 0 && !TM.isPositionIndependent();
275}
276
277unsigned HexagonTargetObjectFile::getSmallDataSize() const {
278 return SmallDataThreshold;
279}
280
281bool HexagonTargetObjectFile::shouldPutJumpTableInFunctionSection(
282 bool UsesLabelDifference, const Function &F) const {
283 return EmitJtInText;
284}
285
286/// Descends any type down to "elementary" components,
287/// discovering the smallest addressable one.
288/// If zero is returned, declaration will not be modified.
289unsigned HexagonTargetObjectFile::getSmallestAddressableSize(const Type *Ty,
290 const GlobalValue *GV, const TargetMachine &TM) const {
291 // Assign the smallest element access size to the highest
292 // value which assembler can handle.
293 unsigned SmallestElement = 8;
294
295 if (!Ty)
296 return 0;
297 switch (Ty->getTypeID()) {
298 case Type::StructTyID: {
299 const StructType *STy = cast<const StructType>(Ty);
300 for (auto &E : STy->elements()) {
301 unsigned AtomicSize = getSmallestAddressableSize(E, GV, TM);
302 if (AtomicSize < SmallestElement)
303 SmallestElement = AtomicSize;
304 }
305 return (STy->getNumElements() == 0) ? 0 : SmallestElement;
306 }
307 case Type::ArrayTyID: {
308 const ArrayType *ATy = cast<const ArrayType>(Ty);
309 return getSmallestAddressableSize(ATy->getElementType(), GV, TM);
310 }
311 case Type::FixedVectorTyID:
312 case Type::ScalableVectorTyID: {
313 const VectorType *PTy = cast<const VectorType>(Ty);
314 return getSmallestAddressableSize(PTy->getElementType(), GV, TM);
315 }
316 case Type::PointerTyID:
317 case Type::HalfTyID:
318 case Type::FloatTyID:
319 case Type::DoubleTyID:
320 case Type::IntegerTyID: {
321 const DataLayout &DL = GV->getParent()->getDataLayout();
322 // It is unfortunate that DL's function take non-const Type*.
323 return DL.getTypeAllocSize(const_cast<Type*>(Ty));
324 }
325 case Type::FunctionTyID:
326 case Type::VoidTyID:
327 case Type::BFloatTyID:
328 case Type::X86_FP80TyID:
329 case Type::FP128TyID:
330 case Type::PPC_FP128TyID:
331 case Type::LabelTyID:
332 case Type::MetadataTyID:
333 case Type::X86_MMXTyID:
334 case Type::X86_AMXTyID:
335 case Type::TokenTyID:
336 return 0;
337 }
338
339 return 0;
340}
341
342MCSection *HexagonTargetObjectFile::selectSmallSectionForGlobal(
343 const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
344 const Type *GTy = GO->getValueType();
345 unsigned Size = getSmallestAddressableSize(GTy, GO, TM);
346
347 // If we have -ffunction-section or -fdata-section then we should emit the
348 // global value to a unique section specifically for it... even for sdata.
349 bool EmitUniquedSection = TM.getDataSections();
350
351 TRACE("Small data. Size(" << Size << ")")do { if (TraceGVPlacement) { errs() << "Small data. Size("
<< Size << ")"; } } while (false);
352 // Handle Small Section classification here.
353 if (Kind.isBSS() || Kind.isBSSLocal()) {
354 // If -mno-sort-sda is not set, find out smallest accessible entity in
355 // declaration and add it to the section name string.
356 // Note. It does not track the actual usage of the value, only its de-
357 // claration. Also, compiler adds explicit pad fields to some struct
358 // declarations - they are currently counted towards smallest addres-
359 // sable entity.
360 if (NoSmallDataSorting) {
361 TRACE(" default sbss\n")do { if (TraceGVPlacement) { errs() << " default sbss\n"
; } } while (false);
362 return SmallBSSSection;
363 }
364
365 StringRef Prefix(".sbss");
366 SmallString<128> Name(Prefix);
367 Name.append(getSectionSuffixForSize(Size));
368
369 if (EmitUniquedSection) {
370 Name.append(".");
371 Name.append(GO->getName());
372 }
373 TRACE(" unique sbss(" << Name << ")\n")do { if (TraceGVPlacement) { errs() << " unique sbss(" <<
Name << ")\n"; } } while (false);
374 return getContext().getELFSection(Name.str(), ELF::SHT_NOBITS,
375 ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_HEX_GPREL);
376 }
377
378 if (Kind.isCommon()) {
379 // This is purely for LTO+Linker Script because commons don't really have a
380 // section. However, the BitcodeSectionWriter pass will query for the
381 // sections of commons (and the linker expects us to know their section) so
382 // we'll return one here.
383 if (NoSmallDataSorting)
384 return BSSSection;
385
386 Twine Name = Twine(".scommon") + getSectionSuffixForSize(Size);
387 TRACE(" small COMMON (" << Name << ")\n")do { if (TraceGVPlacement) { errs() << " small COMMON ("
<< Name << ")\n"; } } while (false);
388
389 return getContext().getELFSection(Name.str(), ELF::SHT_NOBITS,
390 ELF::SHF_WRITE | ELF::SHF_ALLOC |
391 ELF::SHF_HEX_GPREL);
392 }
393
394 // We could have changed sdata object to a constant... in this
395 // case the Kind could be wrong for it.
396 if (Kind.isMergeableConst()) {
397 TRACE(" const_object_as_data ")do { if (TraceGVPlacement) { errs() << " const_object_as_data "
; } } while (false);
398 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GO);
399 if (GVar->hasSection() && isSmallDataSection(GVar->getSection()))
400 Kind = SectionKind::getData();
401 }
402
403 if (Kind.isData()) {
404 if (NoSmallDataSorting) {
405 TRACE(" default sdata\n")do { if (TraceGVPlacement) { errs() << " default sdata\n"
; } } while (false);
406 return SmallDataSection;
407 }
408
409 StringRef Prefix(".sdata");
410 SmallString<128> Name(Prefix);
411 Name.append(getSectionSuffixForSize(Size));
412
413 if (EmitUniquedSection) {
414 Name.append(".");
415 Name.append(GO->getName());
416 }
417 TRACE(" unique sdata(" << Name << ")\n")do { if (TraceGVPlacement) { errs() << " unique sdata("
<< Name << ")\n"; } } while (false);
418 return getContext().getELFSection(Name.str(), ELF::SHT_PROGBITS,
419 ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_HEX_GPREL);
420 }
421
422 TRACE("default ELF section\n")do { if (TraceGVPlacement) { errs() << "default ELF section\n"
; } } while (false);
423 // Otherwise, we work the same as ELF.
424 return TargetLoweringObjectFileELF::SelectSectionForGlobal(GO, Kind, TM);
425}
426
427// Return the function that uses the lookup table. If there are more
428// than one live function that uses this look table, bail out and place
429// the lookup table in default section.
430const Function *
431HexagonTargetObjectFile::getLutUsedFunction(const GlobalObject *GO) const {
432 const Function *ReturnFn = nullptr;
433 for (auto U : GO->users()) {
434 // validate each instance of user to be a live function.
435 auto *I = dyn_cast<Instruction>(U);
436 if (!I)
437 continue;
438 auto *Bb = I->getParent();
439 if (!Bb)
440 continue;
441 auto *UserFn = Bb->getParent();
442 if (!ReturnFn)
443 ReturnFn = UserFn;
444 else if (ReturnFn != UserFn)
445 return nullptr;
446 }
447 return ReturnFn;
448}
449
450MCSection *HexagonTargetObjectFile::selectSectionForLookupTable(
451 const GlobalObject *GO, const TargetMachine &TM, const Function *Fn) const {
452
453 SectionKind Kind = SectionKind::getText();
454 // If the function has explicit section, place the lookup table in this
455 // explicit section.
456 if (Fn->hasSection())
13
←
Assuming the condition is false
→
14
←
Taking false branch
→
457 return getExplicitSectionGlobal(Fn, Kind, TM);
458
459 const auto *FuncObj = dyn_cast<GlobalObject>(Fn);
15
←
Assuming 'Fn' is not a 'GlobalObject'
→
16
←
'FuncObj' initialized to a null pointer value
→
460 return SelectSectionForGlobal(FuncObj, Kind, TM);
17
←
Passing null pointer value via 1st parameter 'GO'
→
18
←
Calling 'HexagonTargetObjectFile::SelectSectionForGlobal'
→
461}