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Add support for alignment

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15888 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-08-17 19:14:29 +00:00
parent d2b0bb41f4
commit bfddc2030a
2 changed files with 27 additions and 2 deletions
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23
include/llvm/CodeGen/AsmPrinter.h
View File

@ -47,7 +47,7 @@ namespace llvm {
/// CommentChar - This indicates the comment character used by the
/// assembler.
const char *CommentChar;
const char *CommentChar; // Defaults to "#"
/// GlobalPrefix - If this is set to a non-empty string, it is prepended
/// onto all global symbols. This is often used for "_" or ".".
@ -71,6 +71,17 @@ namespace llvm {
const char *Data32bitsDirective; // Defaults to "\t.long\t"
const char *Data64bitsDirective; // Defaults to "\t.quad\t"
/// AlignDirective - The directive used to emit round up to an alignment
/// boundary.
///
const char *AlignDirective; // Defaults to "\t.align\t"
/// AlignmentIsInBytes - If this is true (the default) then the asmprinter
/// emits ".align N" directives, where N is the number of bytes to align to.
/// Otherwise, it emits ".align log2(N)", e.g. 3 to align to an 8 byte
/// boundary.
bool AlignmentIsInBytes; // Defaults to true
AsmPrinter(std::ostream &o, TargetMachine &tm)
: O(o), TM(tm),
CommentChar("#"),
@ -80,7 +91,10 @@ namespace llvm {
Data8bitsDirective("\t.byte\t"),
Data16bitsDirective("\t.short\t"),
Data32bitsDirective("\t.long\t"),
Data64bitsDirective("\t.quad\t") { }
Data64bitsDirective("\t.quad\t"),
AlignDirective("\t.align\t"),
AlignmentIsInBytes(true) {
}
/// doInitialization - Set up the AsmPrinter when we are working on a new
/// module. If your pass overrides this, it must make sure to explicitly
@ -95,6 +109,11 @@ namespace llvm {
/// is being processed from runOnMachineFunction.
void setupMachineFunction(MachineFunction &MF);
/// emitAlignment - Emit an alignment directive to the specified power of
/// two boundary. For example, if you pass in 3 here, you will get an 8
/// byte alignment.
void emitAlignment(unsigned NumBits) const;
/// emitConstantValueOnly - Print out the specified constant, without a
/// storage class. Only constants of first-class type are allowed here.
void emitConstantValueOnly(const Constant *CV);

6
lib/CodeGen/AsmPrinter.cpp
View File

@ -33,6 +33,12 @@ void AsmPrinter::setupMachineFunction(MachineFunction &MF) {
CurrentFnName = Mang->getValueName((Value*)MF.getFunction());
}
// emitAlignment - Emit an alignment directive to the specified power of two.
void AsmPrinter::emitAlignment(unsigned NumBits) const {
if (AlignmentIsInBytes) NumBits = 1 << NumBits;
O << AlignDirective << NumBits << "\n";
}
// Print out the specified constant, without a storage class. Only the
// constants valid in constant expressions can occur here.
void AsmPrinter::emitConstantValueOnly(const Constant *CV) {