1 //===-- PPCTargetAsmInfo.cpp - PPC asm properties ---------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the declarations of the DarwinTargetAsmInfo properties.
12 //===----------------------------------------------------------------------===//
14 #include "PPCTargetAsmInfo.h"
15 #include "PPCTargetMachine.h"
16 #include "llvm/Function.h"
17 #include "llvm/Support/Dwarf.h"
20 using namespace llvm::dwarf;
22 PPCTargetAsmInfo::PPCTargetAsmInfo(const PPCTargetMachine &TM) {
23 bool isPPC64 = TM.getSubtargetImpl()->isPPC64();
25 ZeroDirective = "\t.space\t";
26 SetDirective = "\t.set";
27 Data64bitsDirective = isPPC64 ? "\t.quad\t" : 0;
28 AlignmentIsInBytes = false;
29 LCOMMDirective = "\t.lcomm\t";
30 InlineAsmStart = "# InlineAsm Start";
31 InlineAsmEnd = "# InlineAsm End";
32 AssemblerDialect = TM.getSubtargetImpl()->getAsmFlavor();
35 PPCDarwinTargetAsmInfo::PPCDarwinTargetAsmInfo(const PPCTargetMachine &TM):
36 PPCTargetAsmInfo(TM), DarwinTargetAsmInfo(TM) {
40 PrivateGlobalPrefix = "L";
41 LessPrivateGlobalPrefix = "l";
42 StringConstantPrefix = "\1LC";
43 ConstantPoolSection = "\t.const\t";
44 JumpTableDataSection = ".const";
45 CStringSection = "\t.cstring";
46 FourByteConstantSection = "\t.literal4\n";
47 EightByteConstantSection = "\t.literal8\n";
48 ReadOnlySection = "\t.const\n";
49 if (TM.getRelocationModel() == Reloc::Static) {
50 StaticCtorsSection = ".constructor";
51 StaticDtorsSection = ".destructor";
53 StaticCtorsSection = ".mod_init_func";
54 StaticDtorsSection = ".mod_term_func";
56 SwitchToSectionDirective = "\t.section ";
57 UsedDirective = "\t.no_dead_strip\t";
58 WeakDefDirective = "\t.weak_definition ";
59 WeakRefDirective = "\t.weak_reference ";
60 HiddenDirective = "\t.private_extern ";
61 SupportsExceptionHandling = true;
62 NeedsIndirectEncoding = true;
67 ".section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms+live_support";
68 DwarfExceptionSection = ".section __DATA,__gcc_except_tab";
69 GlobalEHDirective = "\t.globl\t";
70 SupportsWeakOmittedEHFrame = false;
72 DwarfAbbrevSection = ".section __DWARF,__debug_abbrev,regular,debug";
73 DwarfInfoSection = ".section __DWARF,__debug_info,regular,debug";
74 DwarfLineSection = ".section __DWARF,__debug_line,regular,debug";
75 DwarfFrameSection = ".section __DWARF,__debug_frame,regular,debug";
76 DwarfPubNamesSection = ".section __DWARF,__debug_pubnames,regular,debug";
77 DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes,regular,debug";
78 DwarfStrSection = ".section __DWARF,__debug_str,regular,debug";
79 DwarfLocSection = ".section __DWARF,__debug_loc,regular,debug";
80 DwarfARangesSection = ".section __DWARF,__debug_aranges,regular,debug";
81 DwarfRangesSection = ".section __DWARF,__debug_ranges,regular,debug";
82 DwarfMacInfoSection = ".section __DWARF,__debug_macinfo,regular,debug";
84 // In non-PIC modes, emit a special label before jump tables so that the
85 // linker can perform more accurate dead code stripping.
86 if (TM.getRelocationModel() != Reloc::PIC_) {
87 // Emit a local label that is preserved until the linker runs.
88 JumpTableSpecialLabelPrefix = "l";
92 /// PreferredEHDataFormat - This hook allows the target to select data
93 /// format used for encoding pointers in exception handling data. Reason is
94 /// 0 for data, 1 for code labels, 2 for function pointers. Global is true
95 /// if the symbol can be relocated.
97 PPCDarwinTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
99 if (Reason == DwarfEncoding::Functions && Global)
100 return (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4);
101 else if (Reason == DwarfEncoding::CodeLabels || !Global)
102 return DW_EH_PE_pcrel;
104 return DW_EH_PE_absptr;
108 PPCLinuxTargetAsmInfo::PPCLinuxTargetAsmInfo(const PPCTargetMachine &TM) :
109 PPCTargetAsmInfo(TM), ELFTargetAsmInfo(TM) {
112 PrivateGlobalPrefix = "";
113 ConstantPoolSection = "\t.section .rodata.cst4\t";
114 JumpTableDataSection = ".section .rodata.cst4";
115 CStringSection = ".rodata.str";
116 StaticCtorsSection = ".section\t.ctors,\"aw\",@progbits";
117 StaticDtorsSection = ".section\t.dtors,\"aw\",@progbits";
118 UsedDirective = "\t# .no_dead_strip\t";
119 WeakRefDirective = "\t.weak\t";
120 BSSSection = "\t.section\t\".sbss\",\"aw\",@nobits";
122 // PPC/Linux normally uses named section for BSS.
123 BSSSection_ = getNamedSection("\t.bss",
124 SectionFlags::Writeable | SectionFlags::BSS,
125 /* Override */ true);
128 AbsoluteDebugSectionOffsets = true;
129 SupportsDebugInformation = true;
130 DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"\",@progbits";
131 DwarfInfoSection = "\t.section\t.debug_info,\"\",@progbits";
132 DwarfLineSection = "\t.section\t.debug_line,\"\",@progbits";
133 DwarfFrameSection = "\t.section\t.debug_frame,\"\",@progbits";
134 DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"\",@progbits";
135 DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"\",@progbits";
136 DwarfStrSection = "\t.section\t.debug_str,\"\",@progbits";
137 DwarfLocSection = "\t.section\t.debug_loc,\"\",@progbits";
138 DwarfARangesSection = "\t.section\t.debug_aranges,\"\",@progbits";
139 DwarfRangesSection = "\t.section\t.debug_ranges,\"\",@progbits";
140 DwarfMacInfoSection = "\t.section\t.debug_macinfo,\"\",@progbits";
142 ReadOnlySection = "\t.section\t.rodata";
143 FourByteConstantSection = "\t.section\t.rodata.cst4,\"aM\",@progbits,4";
144 EightByteConstantSection = "\t.section\t.rodata.cst8,\"aM\",@progbits,8";
145 SixteenByteConstantSection = "\t.section\t.rodata.cst16,\"aM\",@progbits,16";
148 // Set up DWARF directives
149 HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
151 // Exceptions handling
152 if (!TM.getSubtargetImpl()->isPPC64())
153 SupportsExceptionHandling = true;
154 AbsoluteEHSectionOffsets = false;
155 DwarfEHFrameSection = "\t.section\t.eh_frame,\"aw\",@progbits";
156 DwarfExceptionSection = "\t.section\t.gcc_except_table,\"a\",@progbits";
159 /// PreferredEHDataFormat - This hook allows the target to select data
160 /// format used for encoding pointers in exception handling data. Reason is
161 /// 0 for data, 1 for code labels, 2 for function pointers. Global is true
162 /// if the symbol can be relocated.
164 PPCLinuxTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
166 // We really need to write something here.
167 return TargetAsmInfo::PreferredEHDataFormat(Reason, Global);