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https://github.com/c64scene-ar/llvm-6502.git
synced 2025-01-14 00:32:55 +00:00
Add some support for (Darwin) code-generating directives in getInlineAsmLength.
Support is incomplete, but more accurate than gcc's. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36634 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen
parent
79dda2b048
commit
67cf561b7f
@ -1,3 +1,4 @@
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//===-- ARMTargetAsmInfo.cpp - ARM asm properties ---------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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@ -18,7 +19,7 @@
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using namespace llvm;
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ARMTargetAsmInfo::ARMTargetAsmInfo(const ARMTargetMachine &TM) {
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const ARMSubtarget *Subtarget = &TM.getSubtarget<ARMSubtarget>();
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Subtarget = &TM.getSubtarget<ARMSubtarget>();
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if (Subtarget->isTargetDarwin()) {
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GlobalPrefix = "_";
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PrivateGlobalPrefix = "L";
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@ -85,13 +86,42 @@ ARMTargetAsmInfo::ARMTargetAsmInfo(const ARMTargetMachine &TM) {
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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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isThumb = Subtarget->isThumb();
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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 *Str) const {
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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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@ -102,30 +132,94 @@ unsigned ARMTargetAsmInfo::getInlineAsmLength(const char *Str) const {
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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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else {
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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 (strncasecmp(Str, ".literal4", strlen(".literal4"))==0 ||
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strncasecmp(Str, ".literal8", strlen(".literal8"))==0 ||
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strncasecmp(Str, ".const", strlen(".const"))==0 ||
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strncasecmp(Str, ".constructor", strlen(".constructor"))==0 ||
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strncasecmp(Str, ".cstring", strlen(".cstring"))==0 ||
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strncasecmp(Str, ".data", strlen(".data"))==0 ||
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strncasecmp(Str, ".destructor", strlen(".destructor"))==0 ||
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strncasecmp(Str, ".fvmlib_init0", strlen(".fvmlib_init0"))==0 ||
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strncasecmp(Str, ".fvmlib_init1", strlen(".fvmlib_init1"))==0 ||
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strncasecmp(Str, ".mod_init_func", strlen(".mod_init_func"))==0 ||
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strncasecmp(Str, ".mod_term_func", strlen(".mod_term_func"))==0 ||
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strncasecmp(Str, ".picsymbol_stub", strlen(".picsymbol_stub"))==0 ||
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strncasecmp(Str, ".symbol_stub", strlen(".symbol_stub"))==0 ||
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strncasecmp(Str, ".static_data", strlen(".static_data"))==0 ||
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strncasecmp(Str, ".section", strlen(".section"))==0 ||
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strncasecmp(Str, ".lazy_symbol_pointer", strlen(".lazy_symbol_pointer"))==0 ||
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strncasecmp(Str, ".non_lazy_symbol_pointer", strlen(".non_lazy_symbol_pointer"))==0 ||
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strncasecmp(Str, ".dyld", strlen(".dyld"))==0 ||
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strncasecmp(Str, ".const_data", strlen(".const_data"))==0 ||
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strncasecmp(Str, ".objc", strlen(".objc"))==0 || //// many directives
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strncasecmp(Str, ".static_const", strlen(".static_const"))==0)
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inTextSection=false;
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else if (strncasecmp(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 (strncasecmp(Str, ".macro", strlen(".macro"))==0 ||
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strncasecmp(Str, ".if", strlen(".if"))==0 ||
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strncasecmp(Str, ".align", strlen(".align"))==0 ||
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strncasecmp(Str, ".fill", strlen(".fill"))==0 ||
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strncasecmp(Str, ".space", strlen(".space"))==0 ||
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strncasecmp(Str, ".zerofill", strlen(".zerofill"))==0 ||
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strncasecmp(Str, ".p2align", strlen(".p2align"))==0 ||
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strncasecmp(Str, ".p2alignw", strlen(".p2alignw"))==0 ||
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strncasecmp(Str, ".p2alignl", strlen(".p2alignl"))==0 ||
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strncasecmp(Str, ".align32", strlen(".p2align32"))==0 ||
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strncasecmp(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 (strncasecmp(Str, ".long", strlen(".long"))==0)
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Length += 4*countArguments(Str+strlen(".long"));
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else if (strncasecmp(Str, ".short", strlen(".short"))==0)
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Length += 2*countArguments(Str+strlen(".short"));
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else if (strncasecmp(Str, ".byte", strlen(".byte"))==0)
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Length += 1*countArguments(Str+strlen(".byte"));
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else if (strncasecmp(Str, ".single", strlen(".single"))==0)
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Length += 4*countArguments(Str+strlen(".single"));
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else if (strncasecmp(Str, ".double", strlen(".double"))==0)
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Length += 8*countArguments(Str+strlen(".double"));
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else if (strncasecmp(Str, ".quad", strlen(".quad"))==0)
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Length += 16*countArguments(Str+strlen(".quad"));
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else if (strncasecmp(Str, ".ascii", strlen(".ascii"))==0)
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Length += countString(Str+strlen(".ascii"));
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else if (strncasecmp(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 (isThumb) {
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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 ((*Str=='b' || *Str=='B') &&
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(*(Str+1)=='l' || *(Str+1)=='L')) {
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if (*(Str+2)=='x' || *(Str+2)=='X') {
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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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}
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if (strncasecmp(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; // BL
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} else
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Length += 4; // BLX non-reg
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} else if (strncasecmp(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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@ -15,6 +15,7 @@
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#define ARMTARGETASMINFO_H
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#include "llvm/Target/TargetAsmInfo.h"
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#include "ARMSubtarget.h"
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namespace llvm {
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@ -24,9 +25,11 @@ namespace llvm {
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struct ARMTargetAsmInfo : public TargetAsmInfo {
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ARMTargetAsmInfo(const ARMTargetMachine &TM);
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bool isThumb;
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const ARMSubtarget *Subtarget;
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virtual unsigned getInlineAsmLength(const char *Str) const;
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unsigned countArguments(const char *p) const;
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unsigned countString(const char *p) const;
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};
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