From 249cb6756c0e37c88a87c60ff7ec13c87af76c53 Mon Sep 17 00:00:00 2001 From: Quentin Colombet Date: Sat, 8 Jun 2013 00:07:54 +0000 Subject: Reapply r183552. This time, use a standard type for the option to avoid template instantiation issue with non-standard type. Add a backend option to warn on a given stack size limit. Option: -mllvm -warn-stack-size= Output (if limit is exceeded): warning: Stack size limit exceeded () in . The longer term plan is to hook that to a clang warning. PR:4072 . llvm-svn: 183595 --- llvm/lib/CodeGen/PrologEpilogInserter.cpp | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'llvm/lib/CodeGen') diff --git a/llvm/lib/CodeGen/PrologEpilogInserter.cpp b/llvm/lib/CodeGen/PrologEpilogInserter.cpp index 959dd7df58e..4b301d84ca4 100644 --- a/llvm/lib/CodeGen/PrologEpilogInserter.cpp +++ b/llvm/lib/CodeGen/PrologEpilogInserter.cpp @@ -35,6 +35,7 @@ #include "llvm/Support/CommandLine.h" #include "llvm/Support/Compiler.h" #include "llvm/Support/Debug.h" +#include "llvm/Support/raw_ostream.h" #include "llvm/Target/TargetFrameLowering.h" #include "llvm/Target/TargetInstrInfo.h" #include "llvm/Target/TargetMachine.h" @@ -46,6 +47,11 @@ using namespace llvm; char PEI::ID = 0; char &llvm::PrologEpilogCodeInserterID = PEI::ID; +static cl::opt +WarnStackSize("warn-stack-size", cl::Hidden, cl::init((unsigned)-1), + cl::desc("Warn for stack size bigger than the given" + " number")); + INITIALIZE_PASS_BEGIN(PEI, "prologepilog", "Prologue/Epilogue Insertion", false, false) INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo) @@ -128,6 +134,13 @@ bool PEI::runOnMachineFunction(MachineFunction &Fn) { // Clear any vregs created by virtual scavenging. Fn.getRegInfo().clearVirtRegs(); + // Warn on stack size when we exceeds the given limit. + MachineFrameInfo *MFI = Fn.getFrameInfo(); + if (WarnStackSize.getNumOccurrences() > 0 && + WarnStackSize < MFI->getStackSize()) + errs() << "warning: Stack size limit exceeded (" << MFI->getStackSize() + << ") in " << Fn.getName() << ".\n"; + delete RS; clearAllSets(); return true; -- cgit v1.2.3