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-rw-r--r--lib/Target/ARM/ARMInstrInfo.cpp169
1 files changed, 164 insertions, 5 deletions
diff --git a/lib/Target/ARM/ARMInstrInfo.cpp b/lib/Target/ARM/ARMInstrInfo.cpp
index c9d5ac1f2b..cadfc0b71a 100644
--- a/lib/Target/ARM/ARMInstrInfo.cpp
+++ b/lib/Target/ARM/ARMInstrInfo.cpp
@@ -26,11 +26,10 @@
using namespace llvm;
ARMInstrInfo::ARMInstrInfo(const ARMSubtarget &STI)
- : ARMBaseInstrInfo(STI), RI(*this, STI) {
+ : RI(*this, STI), Subtarget(STI) {
}
-unsigned ARMInstrInfo::
-getUnindexedOpcode(unsigned Opc) const {
+unsigned ARMInstrInfo::getUnindexedOpcode(unsigned Opc) const {
switch (Opc) {
default: break;
case ARM::LDR_PRE:
@@ -62,8 +61,7 @@ getUnindexedOpcode(unsigned Opc) const {
return 0;
}
-bool ARMInstrInfo::
-BlockHasNoFallThrough(const MachineBasicBlock &MBB) const {
+bool ARMInstrInfo::BlockHasNoFallThrough(const MachineBasicBlock &MBB) const {
if (MBB.empty()) return false;
switch (MBB.back().getOpcode()) {
@@ -100,3 +98,164 @@ reMaterialize(MachineBasicBlock &MBB,
MI->getOperand(0).setReg(DestReg);
MBB.insert(I, MI);
}
+
+/// Count the number of comma-separated arguments.
+/// Do not try to detect errors.
+static unsigned countArguments(const char* p,
+ const TargetAsmInfo &TAI) {
+ unsigned count = 0;
+ while (*p && isspace(*p) && *p != '\n')
+ p++;
+ count++;
+ while (*p && *p!='\n' &&
+ strncmp(p, TAI.getCommentString(),
+ strlen(TAI.getCommentString())) != 0) {
+ if (*p==',')
+ count++;
+ p++;
+ }
+ return count;
+}
+
+/// Count the length of a string enclosed in quote characters.
+/// Do not try to detect errors.
+static unsigned countString(const char *p) {
+ 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 ARMInstrInfo::getInlineAsmLength(const char *s,
+ const TargetAsmInfo &TAI) 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, TAI.getCommentString(),
+ strlen(TAI.getCommentString())) == 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"), TAI);
+ else if (strncmp(Str, ".short", strlen(".short"))==0)
+ Length += 2*countArguments(Str+strlen(".short"), TAI);
+ else if (strncmp(Str, ".byte", strlen(".byte"))==0)
+ Length += 1*countArguments(Str+strlen(".byte"), TAI);
+ else if (strncmp(Str, ".single", strlen(".single"))==0)
+ Length += 4*countArguments(Str+strlen(".single"), TAI);
+ else if (strncmp(Str, ".double", strlen(".double"))==0)
+ Length += 8*countArguments(Str+strlen(".double"), TAI);
+ else if (strncmp(Str, ".quad", strlen(".quad"))==0)
+ Length += 16*countArguments(Str+strlen(".quad"), TAI);
+ 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 == TAI.getSeparatorChar())
+ atInsnStart = true;
+ }
+ free(s_copy);
+ return Length;
+}
+
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