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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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25
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@@ -14,6 +14,7 @@
#include "DwarfDebug.h"
#include "ByteStreamer.h"
#include "DwarfExpression.h"
#include "DwarfCompileUnit.h"
#include "DIEHash.h"
#include "DwarfUnit.h"
@@ -1717,29 +1718,15 @@ void DwarfDebug::emitDebugLocEntry(ByteStreamer &Streamer,
void DwarfDebug::emitDebugLocValue(ByteStreamer &Streamer,
const DebugLocEntry::Value &Value) {
DIVariable DV = Value.getVariable();
DebugLocDwarfExpression Expr(*Asm, Streamer);
// Regular entry.
if (Value.isInt()) {
DIBasicType BTy(resolve(DV.getType()));
if (BTy.Verify() && (BTy.getEncoding() == dwarf::DW_ATE_signed ||
BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
Streamer.EmitInt8(dwarf::DW_OP_consts, "DW_OP_consts");
Streamer.EmitSLEB128(Value.getInt());
} else {
Streamer.EmitInt8(dwarf::DW_OP_constu, "DW_OP_constu");
Streamer.EmitULEB128(Value.getInt());
}
// 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)
Streamer.EmitInt8(dwarf::DW_OP_stack_value, "DW_OP_stack_value");
BTy.getEncoding() == dwarf::DW_ATE_signed_char))
Expr.AddSignedConstant(Value.getInt());
else
Expr.AddUnsignedConstant(Value.getInt());
} else if (Value.isLocation()) {
MachineLocation Loc = Value.getLoc();
DIExpression Expr = Value.getExpression();