/// TargetAsmInfo - This class is intended to be used as a base class for asm
/// properties and features specific to the target.
class TargetAsmInfo {
-
protected:
//===------------------------------------------------------------------===//
// Properties to be set by the target writer, used to configure asm printer.
/// NeedsSet - True if target asm can't compute addresses on data
/// directives.
bool NeedsSet; // Defaults to false.
+
+ /// MaxInstLength - This is the maximum possible length of an instruction,
+ /// which is needed to compute the size of an inline asm.
+ unsigned MaxInstLength; // Defaults to 4.
+
+ /// SeparatorChar - This character, if specified, is used to separate
+ /// instructions from each other when on the same line. This is used to
+ /// measure inline asm instructions.
+ char SeparatorChar; // Defaults to ';'
/// CommentString - This indicates the comment character used by the
/// assembler.
TargetAsmInfo();
virtual ~TargetAsmInfo();
+ /// Measure the specified inline asm to determine an approximation of its
+ /// length.
+ unsigned getInlineAsmLength(const char *Str) const;
+
//
// Accessors.
//
return DwarfMacInfoSection;
}
};
-
}
#endif
DataSection(".data"),
AddressSize(4),
NeedsSet(false),
+ MaxInstLength(4),
+ SeparatorChar(';'),
CommentString("#"),
GlobalPrefix(""),
PrivateGlobalPrefix("."),
DwarfLocSection(".debug_loc"),
DwarfARangesSection(".debug_aranges"),
DwarfRangesSection(".debug_ranges"),
- DwarfMacInfoSection(".debug_macinfo")
-{}
+ DwarfMacInfoSection(".debug_macinfo") {
+}
TargetAsmInfo::~TargetAsmInfo() {
}
+
+/// Measure the specified inline asm to determine an approximation of its
+/// length.
+unsigned TargetAsmInfo::getInlineAsmLength(const char *Str) const {
+ // Count the number of instructions in the asm.
+ unsigned NumInsts = 0;
+ for (; *Str; ++Str) {
+ if (*Str == '\n' || *Str == SeparatorChar)
+ ++NumInsts;
+ }
+
+ // Multiply by the worst-case length for each instruction.
+ return NumInsts * MaxInstLength;
+}