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Have TableGen emit setSubgraphColor calls under control of a -gen-debug

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flag.  Then in a debugger developers can set breakpoints at these calls
to see waht is about to be selected and what the resulting subgraph
looks like.  This really helps when debugging instruction selection.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58278 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Greene 2008-10-27 21:56:29 +00:00
parent 9a40d3361a
commit 8ad4c00c00
11 changed files with 61 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/llvm/CodeGen/DAGISelHeader.h
View File

@ -153,7 +153,7 @@ void ReplaceUses(SDNode *F, SDNode *T) DISABLE_INLINE {
/// SelectRoot - Top level entry to DAG instruction selector.
/// Selects instructions starting at the root of the current DAG.
void SelectRoot() {
void SelectRoot(SelectionDAG &DAG) {
SelectRootInit();
unsigned NumBytes = (DAGSize + 7) / 8;
ISelQueued = new unsigned char[NumBytes];
@ -176,14 +176,18 @@ void SelectRoot() {
// Skip already selected nodes.
if (isSelected(Node->getNodeId()))
continue;
DAG.setSubgraphColor(Node, "red");
SDNode *ResNode = Select(SDValue(Node, 0));
// If node should not be replaced,
// continue with the next one.
if (ResNode == Node)
continue;
// Replace node.
if (ResNode)
if (ResNode) {
DAG.setSubgraphColor(ResNode, "yellow");
DAG.setSubgraphColor(ResNode, "black");
ReplaceUses(Node, ResNode);
}
// If after the replacement this node is not used any more,
// remove this dead node.
if (Node->use_empty()) { // Don't delete EntryToken, etc.
@ -191,6 +195,7 @@ void SelectRoot() {
CurDAG->RemoveDeadNode(Node, &ISQU);
UpdateQueue(ISQU);
}
//DAG.setSubgraphColor(Node, "black");
}
delete[] ISelQueued;

2
lib/Target/ARM/ARMISelDAGToDAG.cpp
View File

@ -94,7 +94,7 @@ public:
void ARMDAGToDAGISel::InstructionSelect() {
DEBUG(BB->dump());
SelectRoot();
SelectRoot(*CurDAG);
CurDAG->RemoveDeadNodes();
}

2
lib/Target/Alpha/AlphaISelDAGToDAG.cpp
View File

@ -230,7 +230,7 @@ void AlphaDAGToDAGISel::InstructionSelect() {
DEBUG(BB->dump());
// Select target instructions for the DAG.
SelectRoot();
SelectRoot(*CurDAG);
CurDAG->RemoveDeadNodes();
}

2
lib/Target/CellSPU/SPUISelDAGToDAG.cpp
View File

@ -344,7 +344,7 @@ SPUDAGToDAGISel::InstructionSelect()
DEBUG(BB->dump());
// Select target instructions for the DAG.
SelectRoot();
SelectRoot(*CurDAG);
CurDAG->RemoveDeadNodes();
}

2
lib/Target/IA64/IA64ISelDAGToDAG.cpp
View File

@ -97,7 +97,7 @@ void IA64DAGToDAGISel::InstructionSelect() {
DEBUG(BB->dump());
// Select target instructions for the DAG.
SelectRoot();
SelectRoot(*CurDAG);
CurDAG->RemoveDeadNodes();
}

2
lib/Target/Mips/MipsISelDAGToDAG.cpp
View File

@ -105,7 +105,7 @@ InstructionSelect()
#endif
// Select target instructions for the DAG.
SelectRoot();
SelectRoot(*CurDAG);
#ifndef NDEBUG
DOUT << "===== Instruction selection ends:\n";

2
lib/Target/PIC16/PIC16ISelDAGToDAG.cpp
View File

@ -102,7 +102,7 @@ void PIC16DAGToDAGISel::InstructionSelect()
#endif
// Select target instructions for the DAG.
SelectRoot();
SelectRoot(*CurDAG);
DOUT << "===== Instruction selection ends:\n";

2
lib/Target/PowerPC/PPCISelDAGToDAG.cpp
View File

@ -204,7 +204,7 @@ void PPCDAGToDAGISel::InstructionSelect() {
DEBUG(BB->dump());
// Select target instructions for the DAG.
SelectRoot();
SelectRoot(*CurDAG);
CurDAG->RemoveDeadNodes();
}

2
lib/Target/Sparc/SparcISelDAGToDAG.cpp
View File

@ -70,7 +70,7 @@ void SparcDAGToDAGISel::InstructionSelect() {
DEBUG(BB->dump());
// Select target instructions for the DAG.
SelectRoot();
SelectRoot(*CurDAG);
CurDAG->RemoveDeadNodes();
}

2
lib/Target/X86/X86ISelDAGToDAG.cpp
View File

@ -655,7 +655,7 @@ void X86DAGToDAGISel::InstructionSelect() {
DOUT << "===== Instruction selection begins:\n";
Indent = 0;
#endif
SelectRoot();
SelectRoot(*CurDAG);
#ifndef NDEBUG
DOUT << "===== Instruction selection ends:\n";
#endif

50
utils/TableGen/DAGISelEmitter.cpp
View File

@ -14,13 +14,21 @@
#include "DAGISelEmitter.h"
#include "Record.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Streams.h"
#include <algorithm>
#include <deque>
using namespace llvm;
namespace {
cl::opt<bool>
GenDebug("gen-debug", cl::desc("Generate debug code"),
cl::init(false));
}
//===----------------------------------------------------------------------===//
// DAGISelEmitter Helper methods
//
@ -969,6 +977,10 @@ public:
emitCode("InChains.push_back(" + ChainName + ");");
emitCode(ChainName + " = CurDAG->getNode(ISD::TokenFactor, MVT::Other, "
"&InChains[0], InChains.size());");
if (GenDebug) {
emitCode("CurDAG->setSubgraphColor(" + ChainName +".getNode(), \"yellow\");");
emitCode("CurDAG->setSubgraphColor(" + ChainName +".getNode(), \"black\");");
}
}
// Loop over all of the operands of the instruction pattern, emitting code
@ -1096,13 +1108,18 @@ public:
if (II.isSimpleLoad | II.mayLoad | II.mayStore) {
std::vector<std::string>::const_iterator mi, mie;
for (mi = LSI.begin(), mie = LSI.end(); mi != mie; ++mi) {
emitCode("SDValue LSI_" + *mi + " = "
std::string LSIName = "LSI_" + *mi;
emitCode("SDValue " + LSIName + " = "
"CurDAG->getMemOperand(cast<MemSDNode>(" +
*mi + ")->getMemOperand());");
if (GenDebug) {
emitCode("CurDAG->setSubgraphColor(" + LSIName +".getNode(), \"yellow\");");
emitCode("CurDAG->setSubgraphColor(" + LSIName +".getNode(), \"black\");");
}
if (IsVariadic)
emitCode("Ops" + utostr(OpsNo) + ".push_back(LSI_" + *mi + ");");
emitCode("Ops" + utostr(OpsNo) + ".push_back(" + LSIName + ");");
else
AllOps.push_back("LSI_" + *mi);
AllOps.push_back(LSIName);
}
}
@ -1269,6 +1286,18 @@ public:
}
emitCode(CodePrefix + Code + ");");
if (GenDebug) {
if (!isRoot) {
emitCode("CurDAG->setSubgraphColor(" + NodeName +".getNode(), \"yellow\");");
emitCode("CurDAG->setSubgraphColor(" + NodeName +".getNode(), \"black\");");
}
else {
emitCode("CurDAG->setSubgraphColor(" + NodeName +", \"yellow\");");
emitCode("CurDAG->setSubgraphColor(" + NodeName +", \"black\");");
}
}
for (unsigned i = 0, e = After.size(); i != e; ++i)
emitCode(After[i]);
@ -1766,8 +1795,19 @@ void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
// Replace the emission code within selection routines with calls to the
// emission functions.
CallerCode = "return Emit_" + utostr(EmitFuncNum) + CallerCode;
GeneratedCode.push_back(std::make_pair(false, CallerCode));
if (GenDebug) {
GeneratedCode.push_back(std::make_pair(0, "CurDAG->setSubgraphColor(N.getNode(), \"red\");"));
}
CallerCode = "SDNode *Result = Emit_" + utostr(EmitFuncNum) + CallerCode;
GeneratedCode.push_back(std::make_pair(3, CallerCode));
if (GenDebug) {
GeneratedCode.push_back(std::make_pair(0, "if(Result) {"));
GeneratedCode.push_back(std::make_pair(0, " CurDAG->setSubgraphColor(Result, \"yellow\");"));
GeneratedCode.push_back(std::make_pair(0, " CurDAG->setSubgraphColor(Result, \"black\");"));
GeneratedCode.push_back(std::make_pair(0, "}"));
//GeneratedCode.push_back(std::make_pair(0, "CurDAG->setSubgraphColor(N.getNode(), \"black\");"));
}
GeneratedCode.push_back(std::make_pair(0, "return Result;"));
}
// Print function.