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300 lines
13 KiB
C++
300 lines
13 KiB
C++
//===-- ARMTargetAsmInfo.cpp - ARM asm properties ---------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the declarations of the ARMTargetAsmInfo properties.
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//
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//===----------------------------------------------------------------------===//
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#include "ARMTargetAsmInfo.h"
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#include "ARMTargetMachine.h"
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#include <cstring>
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#include <cctype>
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using namespace llvm;
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static const char *const arm_asm_table[] = {
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"{r0}", "r0",
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"{r1}", "r1",
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"{r2}", "r2",
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"{r3}", "r3",
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"{r4}", "r4",
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"{r5}", "r5",
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"{r6}", "r6",
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"{r7}", "r7",
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"{r8}", "r8",
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"{r9}", "r9",
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"{r10}", "r10",
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"{r11}", "r11",
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"{r12}", "r12",
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"{r13}", "r13",
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"{r14}", "r14",
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"{lr}", "lr",
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"{sp}", "sp",
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"{ip}", "ip",
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"{fp}", "fp",
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"{sl}", "sl",
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"{memory}", "memory",
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"{cc}", "cc",
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0,0};
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ARMTargetAsmInfo::ARMTargetAsmInfo(const ARMTargetMachine &TM) {
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AsmTransCBE = arm_asm_table;
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AlignmentIsInBytes = false;
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Data64bitsDirective = 0;
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CommentString = "@";
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DataSection = "\t.data";
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ConstantPoolSection = "\t.text\n";
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COMMDirectiveTakesAlignment = false;
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InlineAsmStart = "@ InlineAsm Start";
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InlineAsmEnd = "@ InlineAsm End";
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LCOMMDirective = "\t.lcomm\t";
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}
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ARMDarwinTargetAsmInfo::ARMDarwinTargetAsmInfo(const ARMTargetMachine &TM):
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ARMTargetAsmInfo(TM), DarwinTargetAsmInfo(TM) {
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Subtarget = &DTM->getSubtarget<ARMSubtarget>();
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GlobalPrefix = "_";
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PrivateGlobalPrefix = "L";
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StringConstantPrefix = "\1LC";
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BSSSection = 0; // no BSS section
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ZeroDirective = "\t.space\t";
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ZeroFillDirective = "\t.zerofill\t"; // Uses .zerofill
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SetDirective = "\t.set\t";
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WeakRefDirective = "\t.weak_reference\t";
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HiddenDirective = "\t.private_extern\t";
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ProtectedDirective = NULL;
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JumpTableDataSection = ".const";
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CStringSection = "\t.cstring";
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FourByteConstantSection = "\t.literal4\n";
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EightByteConstantSection = "\t.literal8\n";
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ReadOnlySection = "\t.const\n";
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HasDotTypeDotSizeDirective = false;
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NeedsIndirectEncoding = true;
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if (TM.getRelocationModel() == Reloc::Static) {
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StaticCtorsSection = ".constructor";
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StaticDtorsSection = ".destructor";
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} else {
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StaticCtorsSection = ".mod_init_func";
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StaticDtorsSection = ".mod_term_func";
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}
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// In non-PIC modes, emit a special label before jump tables so that the
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// linker can perform more accurate dead code stripping.
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if (TM.getRelocationModel() != Reloc::PIC_) {
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// Emit a local label that is preserved until the linker runs.
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JumpTableSpecialLabelPrefix = "l";
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}
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NeedsSet = true;
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DwarfAbbrevSection = ".section __DWARF,__debug_abbrev,regular,debug";
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DwarfInfoSection = ".section __DWARF,__debug_info,regular,debug";
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DwarfLineSection = ".section __DWARF,__debug_line,regular,debug";
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DwarfFrameSection = ".section __DWARF,__debug_frame,regular,debug";
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DwarfPubNamesSection = ".section __DWARF,__debug_pubnames,regular,debug";
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DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes,regular,debug";
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DwarfStrSection = ".section __DWARF,__debug_str,regular,debug";
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DwarfLocSection = ".section __DWARF,__debug_loc,regular,debug";
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DwarfARangesSection = ".section __DWARF,__debug_aranges,regular,debug";
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DwarfRangesSection = ".section __DWARF,__debug_ranges,regular,debug";
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DwarfMacInfoSection = ".section __DWARF,__debug_macinfo,regular,debug";
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}
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ARMELFTargetAsmInfo::ARMELFTargetAsmInfo(const ARMTargetMachine &TM):
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ARMTargetAsmInfo(TM), ELFTargetAsmInfo(TM) {
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Subtarget = &ETM->getSubtarget<ARMSubtarget>();
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NeedsSet = false;
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HasLEB128 = true;
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AbsoluteDebugSectionOffsets = true;
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CStringSection = ".rodata.str";
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ReadOnlySection = "\t.section\t.rodata\n";
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FourByteConstantSection = "\t.section\t.rodata.cst4,\"aM\",@progbits,4";
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EightByteConstantSection = "\t.section\t.rodata.cst8,\"aM\",@progbits,8";
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SixteenByteConstantSection = "\t.section\t.rodata.cst16,\"aM\",@progbits,16";
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PrivateGlobalPrefix = ".L";
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WeakRefDirective = "\t.weak\t";
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SetDirective = "\t.set\t";
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DwarfRequiresFrameSection = false;
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DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"\",%progbits";
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DwarfInfoSection = "\t.section\t.debug_info,\"\",%progbits";
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DwarfLineSection = "\t.section\t.debug_line,\"\",%progbits";
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DwarfFrameSection = "\t.section\t.debug_frame,\"\",%progbits";
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DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"\",%progbits";
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DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"\",%progbits";
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DwarfStrSection = "\t.section\t.debug_str,\"\",%progbits";
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DwarfLocSection = "\t.section\t.debug_loc,\"\",%progbits";
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DwarfARangesSection = "\t.section\t.debug_aranges,\"\",%progbits";
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DwarfRangesSection = "\t.section\t.debug_ranges,\"\",%progbits";
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DwarfMacInfoSection = "\t.section\t.debug_macinfo,\"\",%progbits";
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if (Subtarget->isAAPCS_ABI()) {
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StaticCtorsSection = "\t.section .init_array,\"aw\",%init_array";
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StaticDtorsSection = "\t.section .fini_array,\"aw\",%fini_array";
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} else {
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StaticCtorsSection = "\t.section .ctors,\"aw\",%progbits";
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StaticDtorsSection = "\t.section .dtors,\"aw\",%progbits";
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}
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TLSDataSection = "\t.section .tdata,\"awT\",%progbits";
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TLSBSSSection = "\t.section .tbss,\"awT\",%nobits";
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}
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/// Count the number of comma-separated arguments.
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/// Do not try to detect errors.
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unsigned ARMTargetAsmInfo::countArguments(const char* p) const {
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unsigned count = 0;
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while (*p && isspace(*p) && *p != '\n')
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p++;
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count++;
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while (*p && *p!='\n' &&
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strncmp(p, CommentString, strlen(CommentString))!=0) {
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if (*p==',')
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count++;
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p++;
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}
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return count;
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}
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/// Count the length of a string enclosed in quote characters.
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/// Do not try to detect errors.
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unsigned ARMTargetAsmInfo::countString(const char* p) const {
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unsigned count = 0;
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while (*p && isspace(*p) && *p!='\n')
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p++;
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if (!*p || *p != '\"')
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return count;
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while (*++p && *p != '\"')
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count++;
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return count;
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}
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/// ARM-specific version of TargetAsmInfo::getInlineAsmLength.
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unsigned ARMTargetAsmInfo::getInlineAsmLength(const char *s) const {
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// Make a lowercase-folded version of s for counting purposes.
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char *q, *s_copy = (char *)malloc(strlen(s) + 1);
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strcpy(s_copy, s);
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for (q=s_copy; *q; q++)
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*q = tolower(*q);
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const char *Str = s_copy;
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// Count the number of bytes in the asm.
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bool atInsnStart = true;
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bool inTextSection = true;
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unsigned Length = 0;
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for (; *Str; ++Str) {
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if (atInsnStart) {
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// Skip whitespace
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while (*Str && isspace(*Str) && *Str != '\n')
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Str++;
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// Skip label
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for (const char* p = Str; *p && !isspace(*p); p++)
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if (*p == ':') {
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Str = p+1;
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while (*Str && isspace(*Str) && *Str != '\n')
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Str++;
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break;
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}
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// Ignore everything from comment char(s) to EOL
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if (strncmp(Str, CommentString, strlen(CommentString))==-0)
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atInsnStart = false;
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// FIXME do something like the following for non-Darwin
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else if (*Str == '.' && Subtarget->isTargetDarwin()) {
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// Directive.
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atInsnStart = false;
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// Some change the section, but don't generate code.
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if (strncmp(Str, ".literal4", strlen(".literal4"))==0 ||
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strncmp(Str, ".literal8", strlen(".literal8"))==0 ||
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strncmp(Str, ".const", strlen(".const"))==0 ||
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strncmp(Str, ".constructor", strlen(".constructor"))==0 ||
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strncmp(Str, ".cstring", strlen(".cstring"))==0 ||
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strncmp(Str, ".data", strlen(".data"))==0 ||
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strncmp(Str, ".destructor", strlen(".destructor"))==0 ||
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strncmp(Str, ".fvmlib_init0", strlen(".fvmlib_init0"))==0 ||
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strncmp(Str, ".fvmlib_init1", strlen(".fvmlib_init1"))==0 ||
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strncmp(Str, ".mod_init_func", strlen(".mod_init_func"))==0 ||
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strncmp(Str, ".mod_term_func", strlen(".mod_term_func"))==0 ||
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strncmp(Str, ".picsymbol_stub", strlen(".picsymbol_stub"))==0 ||
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strncmp(Str, ".symbol_stub", strlen(".symbol_stub"))==0 ||
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strncmp(Str, ".static_data", strlen(".static_data"))==0 ||
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strncmp(Str, ".section", strlen(".section"))==0 ||
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strncmp(Str, ".lazy_symbol_pointer", strlen(".lazy_symbol_pointer"))==0 ||
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strncmp(Str, ".non_lazy_symbol_pointer", strlen(".non_lazy_symbol_pointer"))==0 ||
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strncmp(Str, ".dyld", strlen(".dyld"))==0 ||
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strncmp(Str, ".const_data", strlen(".const_data"))==0 ||
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strncmp(Str, ".objc", strlen(".objc"))==0 || //// many directives
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strncmp(Str, ".static_const", strlen(".static_const"))==0)
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inTextSection=false;
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else if (strncmp(Str, ".text", strlen(".text"))==0)
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inTextSection = true;
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// Some can't really be handled without implementing significant pieces
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// of an assembler. Others require dynamic adjustment of block sizes in
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// AdjustBBOffsetsAfter; it's a big compile-time speed hit to check every
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// instruction in there, and none of these are currently used in the kernel.
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else if (strncmp(Str, ".macro", strlen(".macro"))==0 ||
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strncmp(Str, ".if", strlen(".if"))==0 ||
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strncmp(Str, ".align", strlen(".align"))==0 ||
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strncmp(Str, ".fill", strlen(".fill"))==0 ||
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strncmp(Str, ".space", strlen(".space"))==0 ||
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strncmp(Str, ".zerofill", strlen(".zerofill"))==0 ||
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strncmp(Str, ".p2align", strlen(".p2align"))==0 ||
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strncmp(Str, ".p2alignw", strlen(".p2alignw"))==0 ||
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strncmp(Str, ".p2alignl", strlen(".p2alignl"))==0 ||
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strncmp(Str, ".align32", strlen(".p2align32"))==0 ||
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strncmp(Str, ".include", strlen(".include"))==0)
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cerr << "Directive " << Str << " in asm may lead to invalid offsets for" <<
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" constant pools (the assembler will tell you if this happens).\n";
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// Some generate code, but this is only interesting in the text section.
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else if (inTextSection) {
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if (strncmp(Str, ".long", strlen(".long"))==0)
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Length += 4*countArguments(Str+strlen(".long"));
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else if (strncmp(Str, ".short", strlen(".short"))==0)
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Length += 2*countArguments(Str+strlen(".short"));
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else if (strncmp(Str, ".byte", strlen(".byte"))==0)
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Length += 1*countArguments(Str+strlen(".byte"));
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else if (strncmp(Str, ".single", strlen(".single"))==0)
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Length += 4*countArguments(Str+strlen(".single"));
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else if (strncmp(Str, ".double", strlen(".double"))==0)
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Length += 8*countArguments(Str+strlen(".double"));
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else if (strncmp(Str, ".quad", strlen(".quad"))==0)
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Length += 16*countArguments(Str+strlen(".quad"));
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else if (strncmp(Str, ".ascii", strlen(".ascii"))==0)
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Length += countString(Str+strlen(".ascii"));
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else if (strncmp(Str, ".asciz", strlen(".asciz"))==0)
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Length += countString(Str+strlen(".asciz"))+1;
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}
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} else if (inTextSection) {
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// An instruction
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atInsnStart = false;
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if (Subtarget->isThumb()) {
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// BL and BLX <non-reg> are 4 bytes, all others 2.
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if (strncmp(Str, "blx", strlen("blx"))==0) {
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const char* p = Str+3;
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while (*p && isspace(*p))
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p++;
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if (*p == 'r' || *p=='R')
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Length += 2; // BLX reg
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else
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Length += 4; // BLX non-reg
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} else if (strncmp(Str, "bl", strlen("bl"))==0)
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Length += 4; // BL
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else
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Length += 2; // Thumb anything else
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}
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else
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Length += 4; // ARM
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}
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}
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if (*Str == '\n' || *Str == SeparatorChar)
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atInsnStart = true;
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}
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free(s_copy);
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return Length;
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}
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