llvm-6502/lib/Target/ARM/ARMTargetAsmInfo.cpp
2009-07-08 23:10:31 +00:00

255 lines
9.8 KiB
C++

//===-- ARMTargetAsmInfo.cpp - ARM asm properties ---------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the declarations of the ARMTargetAsmInfo properties.
//
//===----------------------------------------------------------------------===//
#include "ARMTargetAsmInfo.h"
#include "ARMTargetMachine.h"
#include <cstring>
#include <cctype>
using namespace llvm;
const char *const llvm::arm_asm_table[] = {
"{r0}", "r0",
"{r1}", "r1",
"{r2}", "r2",
"{r3}", "r3",
"{r4}", "r4",
"{r5}", "r5",
"{r6}", "r6",
"{r7}", "r7",
"{r8}", "r8",
"{r9}", "r9",
"{r10}", "r10",
"{r11}", "r11",
"{r12}", "r12",
"{r13}", "r13",
"{r14}", "r14",
"{lr}", "lr",
"{sp}", "sp",
"{ip}", "ip",
"{fp}", "fp",
"{sl}", "sl",
"{memory}", "memory",
"{cc}", "cc",
0,0
};
ARMDarwinTargetAsmInfo::ARMDarwinTargetAsmInfo(const ARMBaseTargetMachine &TM):
ARMTargetAsmInfo<DarwinTargetAsmInfo>(TM) {
Subtarget = &TM.getSubtarget<ARMSubtarget>();
ZeroDirective = "\t.space\t";
ZeroFillDirective = "\t.zerofill\t"; // Uses .zerofill
SetDirective = "\t.set\t";
ProtectedDirective = NULL;
HasDotTypeDotSizeDirective = false;
SupportsDebugInformation = true;
}
ARMELFTargetAsmInfo::ARMELFTargetAsmInfo(const ARMBaseTargetMachine &TM):
ARMTargetAsmInfo<ELFTargetAsmInfo>(TM) {
Subtarget = &TM.getSubtarget<ARMSubtarget>();
NeedsSet = false;
HasLEB128 = true;
AbsoluteDebugSectionOffsets = true;
CStringSection = ".rodata.str";
PrivateGlobalPrefix = ".L";
WeakRefDirective = "\t.weak\t";
SetDirective = "\t.set\t";
DwarfRequiresFrameSection = false;
DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"\",%progbits";
DwarfInfoSection = "\t.section\t.debug_info,\"\",%progbits";
DwarfLineSection = "\t.section\t.debug_line,\"\",%progbits";
DwarfFrameSection = "\t.section\t.debug_frame,\"\",%progbits";
DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"\",%progbits";
DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"\",%progbits";
DwarfStrSection = "\t.section\t.debug_str,\"\",%progbits";
DwarfLocSection = "\t.section\t.debug_loc,\"\",%progbits";
DwarfARangesSection = "\t.section\t.debug_aranges,\"\",%progbits";
DwarfRangesSection = "\t.section\t.debug_ranges,\"\",%progbits";
DwarfMacroInfoSection = "\t.section\t.debug_macinfo,\"\",%progbits";
if (Subtarget->isAAPCS_ABI()) {
StaticCtorsSection = "\t.section .init_array,\"aw\",%init_array";
StaticDtorsSection = "\t.section .fini_array,\"aw\",%fini_array";
} else {
StaticCtorsSection = "\t.section .ctors,\"aw\",%progbits";
StaticDtorsSection = "\t.section .dtors,\"aw\",%progbits";
}
SupportsDebugInformation = true;
}
/// Count the number of comma-separated arguments.
/// Do not try to detect errors.
template <class BaseTAI>
unsigned ARMTargetAsmInfo<BaseTAI>::countArguments(const char* p) const {
unsigned count = 0;
while (*p && isspace(*p) && *p != '\n')
p++;
count++;
while (*p && *p!='\n' &&
strncmp(p, BaseTAI::CommentString,
strlen(BaseTAI::CommentString))!=0) {
if (*p==',')
count++;
p++;
}
return count;
}
/// Count the length of a string enclosed in quote characters.
/// Do not try to detect errors.
template <class BaseTAI>
unsigned ARMTargetAsmInfo<BaseTAI>::countString(const char* p) const {
unsigned count = 0;
while (*p && isspace(*p) && *p!='\n')
p++;
if (!*p || *p != '\"')
return count;
while (*++p && *p != '\"')
count++;
return count;
}
/// ARM-specific version of TargetAsmInfo::getInlineAsmLength.
template <class BaseTAI>
unsigned ARMTargetAsmInfo<BaseTAI>::getInlineAsmLength(const char *s) const {
// Make a lowercase-folded version of s for counting purposes.
char *q, *s_copy = (char *)malloc(strlen(s) + 1);
strcpy(s_copy, s);
for (q=s_copy; *q; q++)
*q = tolower(*q);
const char *Str = s_copy;
// Count the number of bytes in the asm.
bool atInsnStart = true;
bool inTextSection = true;
unsigned Length = 0;
for (; *Str; ++Str) {
if (atInsnStart) {
// Skip whitespace
while (*Str && isspace(*Str) && *Str != '\n')
Str++;
// Skip label
for (const char* p = Str; *p && !isspace(*p); p++)
if (*p == ':') {
Str = p+1;
while (*Str && isspace(*Str) && *Str != '\n')
Str++;
break;
}
if (*Str == 0) break;
// Ignore everything from comment char(s) to EOL
if (strncmp(Str, BaseTAI::CommentString,
strlen(BaseTAI::CommentString)) == 0)
atInsnStart = false;
// FIXME do something like the following for non-Darwin
else if (*Str == '.' && Subtarget->isTargetDarwin()) {
// Directive.
atInsnStart = false;
// Some change the section, but don't generate code.
if (strncmp(Str, ".literal4", strlen(".literal4"))==0 ||
strncmp(Str, ".literal8", strlen(".literal8"))==0 ||
strncmp(Str, ".const", strlen(".const"))==0 ||
strncmp(Str, ".constructor", strlen(".constructor"))==0 ||
strncmp(Str, ".cstring", strlen(".cstring"))==0 ||
strncmp(Str, ".data", strlen(".data"))==0 ||
strncmp(Str, ".destructor", strlen(".destructor"))==0 ||
strncmp(Str, ".fvmlib_init0", strlen(".fvmlib_init0"))==0 ||
strncmp(Str, ".fvmlib_init1", strlen(".fvmlib_init1"))==0 ||
strncmp(Str, ".mod_init_func", strlen(".mod_init_func"))==0 ||
strncmp(Str, ".mod_term_func", strlen(".mod_term_func"))==0 ||
strncmp(Str, ".picsymbol_stub", strlen(".picsymbol_stub"))==0 ||
strncmp(Str, ".symbol_stub", strlen(".symbol_stub"))==0 ||
strncmp(Str, ".static_data", strlen(".static_data"))==0 ||
strncmp(Str, ".section", strlen(".section"))==0 ||
strncmp(Str, ".lazy_symbol_pointer", strlen(".lazy_symbol_pointer"))==0 ||
strncmp(Str, ".non_lazy_symbol_pointer", strlen(".non_lazy_symbol_pointer"))==0 ||
strncmp(Str, ".dyld", strlen(".dyld"))==0 ||
strncmp(Str, ".const_data", strlen(".const_data"))==0 ||
strncmp(Str, ".objc", strlen(".objc"))==0 || //// many directives
strncmp(Str, ".static_const", strlen(".static_const"))==0)
inTextSection=false;
else if (strncmp(Str, ".text", strlen(".text"))==0)
inTextSection = true;
// Some can't really be handled without implementing significant pieces
// of an assembler. Others require dynamic adjustment of block sizes in
// AdjustBBOffsetsAfter; it's a big compile-time speed hit to check every
// instruction in there, and none of these are currently used in the kernel.
else if (strncmp(Str, ".macro", strlen(".macro"))==0 ||
strncmp(Str, ".if", strlen(".if"))==0 ||
strncmp(Str, ".align", strlen(".align"))==0 ||
strncmp(Str, ".fill", strlen(".fill"))==0 ||
strncmp(Str, ".space", strlen(".space"))==0 ||
strncmp(Str, ".zerofill", strlen(".zerofill"))==0 ||
strncmp(Str, ".p2align", strlen(".p2align"))==0 ||
strncmp(Str, ".p2alignw", strlen(".p2alignw"))==0 ||
strncmp(Str, ".p2alignl", strlen(".p2alignl"))==0 ||
strncmp(Str, ".align32", strlen(".p2align32"))==0 ||
strncmp(Str, ".include", strlen(".include"))==0)
cerr << "Directive " << Str << " in asm may lead to invalid offsets for" <<
" constant pools (the assembler will tell you if this happens).\n";
// Some generate code, but this is only interesting in the text section.
else if (inTextSection) {
if (strncmp(Str, ".long", strlen(".long"))==0)
Length += 4*countArguments(Str+strlen(".long"));
else if (strncmp(Str, ".short", strlen(".short"))==0)
Length += 2*countArguments(Str+strlen(".short"));
else if (strncmp(Str, ".byte", strlen(".byte"))==0)
Length += 1*countArguments(Str+strlen(".byte"));
else if (strncmp(Str, ".single", strlen(".single"))==0)
Length += 4*countArguments(Str+strlen(".single"));
else if (strncmp(Str, ".double", strlen(".double"))==0)
Length += 8*countArguments(Str+strlen(".double"));
else if (strncmp(Str, ".quad", strlen(".quad"))==0)
Length += 16*countArguments(Str+strlen(".quad"));
else if (strncmp(Str, ".ascii", strlen(".ascii"))==0)
Length += countString(Str+strlen(".ascii"));
else if (strncmp(Str, ".asciz", strlen(".asciz"))==0)
Length += countString(Str+strlen(".asciz"))+1;
}
} else if (inTextSection) {
// An instruction
atInsnStart = false;
if (Subtarget->isThumb()) { // FIXME thumb2
// BL and BLX <non-reg> are 4 bytes, all others 2.
if (strncmp(Str, "blx", strlen("blx"))==0) {
const char* p = Str+3;
while (*p && isspace(*p))
p++;
if (*p == 'r' || *p=='R')
Length += 2; // BLX reg
else
Length += 4; // BLX non-reg
} else if (strncmp(Str, "bl", strlen("bl"))==0)
Length += 4; // BL
else
Length += 2; // Thumb anything else
}
else
Length += 4; // ARM
}
}
if (*Str == '\n' || *Str == BaseTAI::SeparatorChar)
atInsnStart = true;
}
free(s_copy);
return Length;
}
// Instantiate default implementation.
TEMPLATE_INSTANTIATION(class ARMTargetAsmInfo<TargetAsmInfo>);