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Add some support for (Darwin) code-generating directives in getInlineAsmLength.

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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 2007-05-02 01:02:40 +00:00
parent 79dda2b048
commit 67cf561b7f
2 changed files with 115 additions and 18 deletions
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128
lib/Target/ARM/ARMTargetAsmInfo.cpp
View File

@ -1,3 +1,4 @@
//===-- ARMTargetAsmInfo.cpp - ARM asm properties ---------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
@ -18,7 +19,7 @@
using namespace llvm;
ARMTargetAsmInfo::ARMTargetAsmInfo(const ARMTargetMachine &TM) {
const ARMSubtarget *Subtarget = &TM.getSubtarget<ARMSubtarget>();
Subtarget = &TM.getSubtarget<ARMSubtarget>();
if (Subtarget->isTargetDarwin()) {
GlobalPrefix = "_";
PrivateGlobalPrefix = "L";
@ -85,13 +86,42 @@ ARMTargetAsmInfo::ARMTargetAsmInfo(const ARMTargetMachine &TM) {
InlineAsmStart = "@ InlineAsm Start";
InlineAsmEnd = "@ InlineAsm End";
LCOMMDirective = "\t.lcomm\t";
isThumb = Subtarget->isThumb();
}
/// Count the number of comma-separated arguments.
/// Do not try to detect errors.
unsigned ARMTargetAsmInfo::countArguments(const char* p) const {
unsigned count = 0;
while (*p && isspace(*p) && *p != '\n')
p++;
count++;
while (*p && *p!='\n' &&
strncmp(p, CommentString, strlen(CommentString))!=0) {
if (*p==',')
count++;
p++;
}
return count;
}
/// Count the length of a string enclosed in quote characters.
/// Do not try to detect errors.
unsigned ARMTargetAsmInfo::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.
unsigned ARMTargetAsmInfo::getInlineAsmLength(const char *Str) const {
// Count the number of bytes in the asm.
bool atInsnStart = true;
bool inTextSection = true;
unsigned Length = 0;
for (; *Str; ++Str) {
if (atInsnStart) {
@ -102,30 +132,94 @@ unsigned ARMTargetAsmInfo::getInlineAsmLength(const char *Str) const {
for (const char* p = Str; *p && !isspace(*p); p++)
if (*p == ':') {
Str = p+1;
while (*Str && isspace(*Str) && *Str != '\n')
Str++;
break;
}
// Ignore everything from comment char(s) to EOL
if (strncmp(Str, CommentString, strlen(CommentString))==-0)
atInsnStart = false;
else {
// 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 (strncasecmp(Str, ".literal4", strlen(".literal4"))==0 ||
strncasecmp(Str, ".literal8", strlen(".literal8"))==0 ||
strncasecmp(Str, ".const", strlen(".const"))==0 ||
strncasecmp(Str, ".constructor", strlen(".constructor"))==0 ||
strncasecmp(Str, ".cstring", strlen(".cstring"))==0 ||
strncasecmp(Str, ".data", strlen(".data"))==0 ||
strncasecmp(Str, ".destructor", strlen(".destructor"))==0 ||
strncasecmp(Str, ".fvmlib_init0", strlen(".fvmlib_init0"))==0 ||
strncasecmp(Str, ".fvmlib_init1", strlen(".fvmlib_init1"))==0 ||
strncasecmp(Str, ".mod_init_func", strlen(".mod_init_func"))==0 ||
strncasecmp(Str, ".mod_term_func", strlen(".mod_term_func"))==0 ||
strncasecmp(Str, ".picsymbol_stub", strlen(".picsymbol_stub"))==0 ||
strncasecmp(Str, ".symbol_stub", strlen(".symbol_stub"))==0 ||
strncasecmp(Str, ".static_data", strlen(".static_data"))==0 ||
strncasecmp(Str, ".section", strlen(".section"))==0 ||
strncasecmp(Str, ".lazy_symbol_pointer", strlen(".lazy_symbol_pointer"))==0 ||
strncasecmp(Str, ".non_lazy_symbol_pointer", strlen(".non_lazy_symbol_pointer"))==0 ||
strncasecmp(Str, ".dyld", strlen(".dyld"))==0 ||
strncasecmp(Str, ".const_data", strlen(".const_data"))==0 ||
strncasecmp(Str, ".objc", strlen(".objc"))==0 || //// many directives
strncasecmp(Str, ".static_const", strlen(".static_const"))==0)
inTextSection=false;
else if (strncasecmp(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 (strncasecmp(Str, ".macro", strlen(".macro"))==0 ||
strncasecmp(Str, ".if", strlen(".if"))==0 ||
strncasecmp(Str, ".align", strlen(".align"))==0 ||
strncasecmp(Str, ".fill", strlen(".fill"))==0 ||
strncasecmp(Str, ".space", strlen(".space"))==0 ||
strncasecmp(Str, ".zerofill", strlen(".zerofill"))==0 ||
strncasecmp(Str, ".p2align", strlen(".p2align"))==0 ||
strncasecmp(Str, ".p2alignw", strlen(".p2alignw"))==0 ||
strncasecmp(Str, ".p2alignl", strlen(".p2alignl"))==0 ||
strncasecmp(Str, ".align32", strlen(".p2align32"))==0 ||
strncasecmp(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 (strncasecmp(Str, ".long", strlen(".long"))==0)
Length += 4*countArguments(Str+strlen(".long"));
else if (strncasecmp(Str, ".short", strlen(".short"))==0)
Length += 2*countArguments(Str+strlen(".short"));
else if (strncasecmp(Str, ".byte", strlen(".byte"))==0)
Length += 1*countArguments(Str+strlen(".byte"));
else if (strncasecmp(Str, ".single", strlen(".single"))==0)
Length += 4*countArguments(Str+strlen(".single"));
else if (strncasecmp(Str, ".double", strlen(".double"))==0)
Length += 8*countArguments(Str+strlen(".double"));
else if (strncasecmp(Str, ".quad", strlen(".quad"))==0)
Length += 16*countArguments(Str+strlen(".quad"));
else if (strncasecmp(Str, ".ascii", strlen(".ascii"))==0)
Length += countString(Str+strlen(".ascii"));
else if (strncasecmp(Str, ".asciz", strlen(".asciz"))==0)
Length += countString(Str+strlen(".asciz"))+1;
}
} else if (inTextSection) {
// An instruction
atInsnStart = false;
if (isThumb) {
if (Subtarget->isThumb()) {
// BL and BLX <non-reg> are 4 bytes, all others 2.
if ((*Str=='b' || *Str=='B') &&
(*(Str+1)=='l' || *(Str+1)=='L')) {
if (*(Str+2)=='x' || *(Str+2)=='X') {
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
}
if (strncasecmp(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; // BL
} else
Length += 4; // BLX non-reg
} else if (strncasecmp(Str, "bl", strlen("bl"))==0)
Length += 4; // BL
else
Length += 2; // Thumb anything else
}
else

5
lib/Target/ARM/ARMTargetAsmInfo.h
View File

@ -15,6 +15,7 @@
#define ARMTARGETASMINFO_H
#include "llvm/Target/TargetAsmInfo.h"
#include "ARMSubtarget.h"
namespace llvm {
@ -24,9 +25,11 @@ namespace llvm {
struct ARMTargetAsmInfo : public TargetAsmInfo {
ARMTargetAsmInfo(const ARMTargetMachine &TM);
bool isThumb;
const ARMSubtarget *Subtarget;
virtual unsigned getInlineAsmLength(const char *Str) const;
unsigned countArguments(const char *p) const;
unsigned countString(const char *p) const;
};