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Debug Info: Move support for constants into DwarfExpression.

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Move the declaration of DebugLocDwarfExpression into DwarfExpression.h
because it needs to be accessed from AsmPrinterDwarf.cpp and DwarfDebug.cpp

NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225734 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl
2015-01-13 00:04:06 +00:00
parent 120c186fde
commit 75212344d1
4 changed files with 65 additions and 37 deletions
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35
lib/CodeGen/AsmPrinter/DwarfExpression.cpp
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@ -21,14 +21,17 @@
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetSubtargetInfo.h"
using namespace llvm;
const TargetRegisterInfo *DwarfExpression::getTRI() const {
return AP.TM.getSubtargetImpl()->getRegisterInfo();
}
void DwarfExpression::AddReg(int DwarfReg, const char* Comment) {
unsigned DwarfExpression::getDwarfVersion() const {
return AP.getDwarfDebug()->getDwarfVersion();
}
void DwarfExpression::AddReg(int DwarfReg, const char *Comment) {
assert(DwarfReg >= 0 && "invalid negative dwarf register number");
if (DwarfReg < 32) {
EmitOp(dwarf::DW_OP_reg0 + DwarfReg, Comment);
@ -51,8 +54,7 @@ void DwarfExpression::AddRegIndirect(int DwarfReg, int Offset, bool Deref) {
EmitOp(dwarf::DW_OP_deref);
}
void DwarfExpression::AddOpPiece(unsigned SizeInBits,
unsigned OffsetInBits) {
void DwarfExpression::AddOpPiece(unsigned SizeInBits, unsigned OffsetInBits) {
assert(SizeInBits > 0 && "piece has size zero");
const unsigned SizeOfByte = 8;
if (OffsetInBits > 0 || SizeInBits % SizeOfByte) {
@ -164,3 +166,28 @@ void DwarfExpression::AddMachineRegPiece(unsigned MachineReg,
// FIXME: We have no reasonable way of handling errors in here.
EmitOp(dwarf::DW_OP_nop, "nop (could not find a dwarf register number)");
}
void DwarfExpression::AddSignedConstant(int Value) {
EmitOp(dwarf::DW_OP_consts);
EmitSigned(Value);
// The proper way to describe a constant value is
// DW_OP_constu <const>, DW_OP_stack_value.
// Unfortunately, DW_OP_stack_value was not available until DWARF-4,
// so we will continue to generate DW_OP_constu <const> for DWARF-2
// and DWARF-3. Technically, this is incorrect since DW_OP_const <const>
// actually describes a value at a constant addess, not a constant value.
// However, in the past there was no better way to describe a constant
// value, so the producers and consumers started to rely on heuristics
// to disambiguate the value vs. location status of the expression.
// See PR21176 for more details.
if (getDwarfVersion() >= 4)
EmitOp(dwarf::DW_OP_stack_value);
}
void DwarfExpression::AddUnsignedConstant(unsigned Value) {
EmitOp(dwarf::DW_OP_constu);
EmitUnsigned(Value);
// cf. comment in DwarfExpression::AddSignedConstant().
if (getDwarfVersion() >= 4)
EmitOp(dwarf::DW_OP_stack_value);
}