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Expose method and ivars for measuring inline asm length properly.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30934 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-10-13 17:50:07 +00:00
parent 7445ea6b17
commit 4c7b07a66f
2 changed files with 31 additions and 4 deletions
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15
include/llvm/Target/TargetAsmInfo.h
View File

@ -27,7 +27,6 @@ namespace llvm {
/// 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.
@ -48,6 +47,15 @@ namespace llvm {
/// 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.
@ -261,6 +269,10 @@ namespace llvm {
TargetAsmInfo();
virtual ~TargetAsmInfo();
/// Measure the specified inline asm to determine an approximation of its
/// length.
unsigned getInlineAsmLength(const char *Str) const;
//
// Accessors.
//
@ -430,7 +442,6 @@ namespace llvm {
return DwarfMacInfoSection;
}
};
}
#endif

20
lib/Target/TargetAsmInfo.cpp
View File

@ -21,6 +21,8 @@ TargetAsmInfo::TargetAsmInfo() :
DataSection(".data"),
AddressSize(4),
NeedsSet(false),
MaxInstLength(4),
SeparatorChar(';'),
CommentString("#"),
GlobalPrefix(""),
PrivateGlobalPrefix("."),
@ -71,8 +73,22 @@ TargetAsmInfo::TargetAsmInfo() :
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;
}