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[ViewCFG] Allow printing edge weights in debuggers 

Summary:
Extending the Function::viewCFG prototypes to allow for printing block probability info in form of .dot files during debugging.

Also avoiding an AV when no BFI/BPI available.

Reviewers: wenlei, davidxl, knaumov

Reviewed By: wenlei, davidxl

Subscribers: MaskRay, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D77978
This commit is contained in:
Hongtao Yu 2020-04-26 11:22:16 -07:00
parent 4cef9812eb
commit 93efe25ab3
3 changed files with 26 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
llvm/include/llvm/Analysis/CFGPrinter.h
View File

@ -64,11 +64,11 @@ public:
DOTFuncInfo(const Function *F) : DOTFuncInfo(F, nullptr, nullptr, 0) {}
DOTFuncInfo(const Function *F, const BlockFrequencyInfo *BFI,
BranchProbabilityInfo *BPI, uint64_t MaxFreq)
const BranchProbabilityInfo *BPI, uint64_t MaxFreq)
: F(F), BFI(BFI), BPI(BPI), MaxFreq(MaxFreq) {
ShowHeat = false;
EdgeWeights = true;
RawWeights = true;
EdgeWeights = !!BPI; // Print EdgeWeights when BPI is available.
RawWeights = !!BFI; // Print RawWeights when BFI is available.
}
const BlockFrequencyInfo *getBFI() { return BFI; }

10
llvm/include/llvm/IR/Function.h
View File

@ -55,6 +55,8 @@ template <typename T> class Optional;
class raw_ostream;
class Type;
class User;
class BranchProbabilityInfo;
class BlockFrequencyInfo;
class Function : public GlobalObject, public ilist_node<Function> {
public:
@ -792,6 +794,10 @@ public:
///
void viewCFG() const;
/// Extended form to print edge weights.
void viewCFG(bool ViewCFGOnly, const BlockFrequencyInfo *BFI,
const BranchProbabilityInfo *BPI) const;
/// viewCFGOnly - This function is meant for use from the debugger. It works
/// just like viewCFG, but it does not include the contents of basic blocks
/// into the nodes, just the label. If you are only interested in the CFG
@ -799,6 +805,10 @@ public:
///
void viewCFGOnly() const;
/// Extended form to print edge weights.
void viewCFGOnly(const BlockFrequencyInfo *BFI,
const BranchProbabilityInfo *BPI) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static bool classof(const Value *V) {
return V->getValueID() == Value::FunctionVal;

23
llvm/lib/Analysis/CFGPrinter.cpp
View File

@ -77,8 +77,8 @@ static void writeCFGToDotFile(Function &F, BlockFrequencyInfo *BFI,
errs() << "\n";
}
static void viewCFG(Function &F, BlockFrequencyInfo *BFI,
BranchProbabilityInfo *BPI, uint64_t MaxFreq,
static void viewCFG(Function &F, const BlockFrequencyInfo *BFI,
const BranchProbabilityInfo *BPI, uint64_t MaxFreq,
bool CFGOnly = false) {
DOTFuncInfo CFGInfo(&F, BFI, BPI, MaxFreq);
CFGInfo.setHeatColors(ShowHeatColors);
@ -240,11 +240,14 @@ PreservedAnalyses CFGOnlyPrinterPass::run(Function &F,
/// program, displaying the CFG of the current function. This depends on there
/// being a 'dot' and 'gv' program in your path.
///
void Function::viewCFG() const {
void Function::viewCFG() const { viewCFG(false, nullptr, nullptr); }
void Function::viewCFG(bool ViewCFGOnly, const BlockFrequencyInfo *BFI,
const BranchProbabilityInfo *BPI) const {
if (!CFGFuncName.empty() && !getName().contains(CFGFuncName))
return;
DOTFuncInfo CFGInfo(this);
ViewGraph(&CFGInfo, "cfg" + getName());
DOTFuncInfo CFGInfo(this, BFI, BPI, BFI ? getMaxFreq(*this, BFI) : 0);
ViewGraph(&CFGInfo, "cfg" + getName(), ViewCFGOnly);
}
/// viewCFGOnly - This function is meant for use from the debugger. It works
@ -252,11 +255,11 @@ void Function::viewCFG() const {
/// into the nodes, just the label. If you are only interested in the CFG
/// this can make the graph smaller.
///
void Function::viewCFGOnly() const {
if (!CFGFuncName.empty() && !getName().contains(CFGFuncName))
return;
DOTFuncInfo CFGInfo(this);
ViewGraph(&CFGInfo, "cfg" + getName(), true);
void Function::viewCFGOnly() const { viewCFGOnly(nullptr, nullptr); }
void Function::viewCFGOnly(const BlockFrequencyInfo *BFI,
const BranchProbabilityInfo *BPI) const {
viewCFG(true, BFI, BPI);
}
FunctionPass *llvm::createCFGPrinterLegacyPassPass() {