1 //===- ARMInstrInfo.cpp - ARM Instruction Information -----------*- 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 ARM implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "ARMInstrInfo.h"
16 #include "ARMAddressingModes.h"
17 #include "ARMGenInstrInfo.inc"
18 #include "ARMMachineFunctionInfo.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/CodeGen/LiveVariables.h"
21 #include "llvm/CodeGen/MachineFrameInfo.h"
22 #include "llvm/CodeGen/MachineInstrBuilder.h"
23 #include "llvm/CodeGen/MachineJumpTableInfo.h"
24 #include "llvm/Target/TargetAsmInfo.h"
25 #include "llvm/Support/CommandLine.h"
28 ARMInstrInfo::ARMInstrInfo(const ARMSubtarget &STI)
29 : RI(*this, STI), Subtarget(STI) {
32 unsigned ARMInstrInfo::getUnindexedOpcode(unsigned Opc) const {
64 bool ARMInstrInfo::BlockHasNoFallThrough(const MachineBasicBlock &MBB) const {
65 if (MBB.empty()) return false;
67 switch (MBB.back().getOpcode()) {
68 case ARM::BX_RET: // Return.
71 case ARM::BR_JTr: // Jumptable branch.
72 case ARM::BR_JTm: // Jumptable branch through mem.
73 case ARM::BR_JTadd: // Jumptable branch add to pc.
83 reMaterialize(MachineBasicBlock &MBB,
84 MachineBasicBlock::iterator I,
85 unsigned DestReg, unsigned SubIdx,
86 const MachineInstr *Orig) const {
87 DebugLoc dl = Orig->getDebugLoc();
88 if (Orig->getOpcode() == ARM::MOVi2pieces) {
89 RI.emitLoadConstPool(MBB, I, dl,
91 Orig->getOperand(1).getImm(),
92 (ARMCC::CondCodes)Orig->getOperand(2).getImm(),
93 Orig->getOperand(3).getReg());
97 MachineInstr *MI = MBB.getParent()->CloneMachineInstr(Orig);
98 MI->getOperand(0).setReg(DestReg);
102 /// Count the number of comma-separated arguments.
103 /// Do not try to detect errors.
104 static unsigned countArguments(const char* p,
105 const TargetAsmInfo &TAI) {
107 while (*p && isspace(*p) && *p != '\n')
110 while (*p && *p!='\n' &&
111 strncmp(p, TAI.getCommentString(),
112 strlen(TAI.getCommentString())) != 0) {
120 /// Count the length of a string enclosed in quote characters.
121 /// Do not try to detect errors.
122 static unsigned countString(const char *p) {
124 while (*p && isspace(*p) && *p!='\n')
126 if (!*p || *p != '\"')
128 while (*++p && *p != '\"')
133 /// ARM-specific version of TargetAsmInfo::getInlineAsmLength.
134 unsigned ARMInstrInfo::getInlineAsmLength(const char *s,
135 const TargetAsmInfo &TAI) const {
136 // Make a lowercase-folded version of s for counting purposes.
137 char *q, *s_copy = (char *)malloc(strlen(s) + 1);
139 for (q=s_copy; *q; q++)
141 const char *Str = s_copy;
143 // Count the number of bytes in the asm.
144 bool atInsnStart = true;
145 bool inTextSection = true;
147 for (; *Str; ++Str) {
150 while (*Str && isspace(*Str) && *Str != '\n')
153 for (const char* p = Str; *p && !isspace(*p); p++)
156 while (*Str && isspace(*Str) && *Str != '\n')
161 if (*Str == 0) break;
163 // Ignore everything from comment char(s) to EOL
164 if (strncmp(Str, TAI.getCommentString(),
165 strlen(TAI.getCommentString())) == 0)
167 // FIXME do something like the following for non-Darwin
168 else if (*Str == '.' && Subtarget.isTargetDarwin()) {
172 // Some change the section, but don't generate code.
173 if (strncmp(Str, ".literal4", strlen(".literal4"))==0 ||
174 strncmp(Str, ".literal8", strlen(".literal8"))==0 ||
175 strncmp(Str, ".const", strlen(".const"))==0 ||
176 strncmp(Str, ".constructor", strlen(".constructor"))==0 ||
177 strncmp(Str, ".cstring", strlen(".cstring"))==0 ||
178 strncmp(Str, ".data", strlen(".data"))==0 ||
179 strncmp(Str, ".destructor", strlen(".destructor"))==0 ||
180 strncmp(Str, ".fvmlib_init0", strlen(".fvmlib_init0"))==0 ||
181 strncmp(Str, ".fvmlib_init1", strlen(".fvmlib_init1"))==0 ||
182 strncmp(Str, ".mod_init_func", strlen(".mod_init_func"))==0 ||
183 strncmp(Str, ".mod_term_func", strlen(".mod_term_func"))==0 ||
184 strncmp(Str, ".picsymbol_stub", strlen(".picsymbol_stub"))==0 ||
185 strncmp(Str, ".symbol_stub", strlen(".symbol_stub"))==0 ||
186 strncmp(Str, ".static_data", strlen(".static_data"))==0 ||
187 strncmp(Str, ".section", strlen(".section"))==0 ||
188 strncmp(Str, ".lazy_symbol_pointer", strlen(".lazy_symbol_pointer"))==0 ||
189 strncmp(Str, ".non_lazy_symbol_pointer", strlen(".non_lazy_symbol_pointer"))==0 ||
190 strncmp(Str, ".dyld", strlen(".dyld"))==0 ||
191 strncmp(Str, ".const_data", strlen(".const_data"))==0 ||
192 strncmp(Str, ".objc", strlen(".objc"))==0 || //// many directives
193 strncmp(Str, ".static_const", strlen(".static_const"))==0)
195 else if (strncmp(Str, ".text", strlen(".text"))==0)
196 inTextSection = true;
197 // Some can't really be handled without implementing significant pieces
198 // of an assembler. Others require dynamic adjustment of block sizes in
199 // AdjustBBOffsetsAfter; it's a big compile-time speed hit to check every
200 // instruction in there, and none of these are currently used in the kernel.
201 else if (strncmp(Str, ".macro", strlen(".macro"))==0 ||
202 strncmp(Str, ".if", strlen(".if"))==0 ||
203 strncmp(Str, ".align", strlen(".align"))==0 ||
204 strncmp(Str, ".fill", strlen(".fill"))==0 ||
205 strncmp(Str, ".space", strlen(".space"))==0 ||
206 strncmp(Str, ".zerofill", strlen(".zerofill"))==0 ||
207 strncmp(Str, ".p2align", strlen(".p2align"))==0 ||
208 strncmp(Str, ".p2alignw", strlen(".p2alignw"))==0 ||
209 strncmp(Str, ".p2alignl", strlen(".p2alignl"))==0 ||
210 strncmp(Str, ".align32", strlen(".p2align32"))==0 ||
211 strncmp(Str, ".include", strlen(".include"))==0)
212 cerr << "Directive " << Str << " in asm may lead to invalid offsets for" <<
213 " constant pools (the assembler will tell you if this happens).\n";
214 // Some generate code, but this is only interesting in the text section.
215 else if (inTextSection) {
216 if (strncmp(Str, ".long", strlen(".long"))==0)
217 Length += 4*countArguments(Str+strlen(".long"), TAI);
218 else if (strncmp(Str, ".short", strlen(".short"))==0)
219 Length += 2*countArguments(Str+strlen(".short"), TAI);
220 else if (strncmp(Str, ".byte", strlen(".byte"))==0)
221 Length += 1*countArguments(Str+strlen(".byte"), TAI);
222 else if (strncmp(Str, ".single", strlen(".single"))==0)
223 Length += 4*countArguments(Str+strlen(".single"), TAI);
224 else if (strncmp(Str, ".double", strlen(".double"))==0)
225 Length += 8*countArguments(Str+strlen(".double"), TAI);
226 else if (strncmp(Str, ".quad", strlen(".quad"))==0)
227 Length += 16*countArguments(Str+strlen(".quad"), TAI);
228 else if (strncmp(Str, ".ascii", strlen(".ascii"))==0)
229 Length += countString(Str+strlen(".ascii"));
230 else if (strncmp(Str, ".asciz", strlen(".asciz"))==0)
231 Length += countString(Str+strlen(".asciz"))+1;
233 } else if (inTextSection) {
236 if (Subtarget.isThumb()) { // FIXME thumb2
237 // BL and BLX <non-reg> are 4 bytes, all others 2.
238 if (strncmp(Str, "blx", strlen("blx"))==0) {
239 const char* p = Str+3;
240 while (*p && isspace(*p))
242 if (*p == 'r' || *p=='R')
243 Length += 2; // BLX reg
245 Length += 4; // BLX non-reg
246 } else if (strncmp(Str, "bl", strlen("bl"))==0)
249 Length += 2; // Thumb anything else
255 if (*Str == '\n' || *Str == TAI.getSeparatorChar())