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author | Quentin Colombet <qcolombet@apple.com> | 2013-06-07 20:18:12 +0000 |
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committer | Quentin Colombet <qcolombet@apple.com> | 2013-06-07 20:18:12 +0000 |
commit | 9a6b9bffa53bfa5e1a8373b31b2ddfa7b6bd7b30 (patch) | |
tree | 97b9f14039b7304cb33af8c277d9772bd9569e8d /lib/CodeGen/PrologEpilogInserter.cpp | |
parent | 8fc760cbe8d42e788f29b4a21537bc5e25d5ffa3 (diff) | |
download | llvm-9a6b9bffa53bfa5e1a8373b31b2ddfa7b6bd7b30.tar.gz llvm-9a6b9bffa53bfa5e1a8373b31b2ddfa7b6bd7b30.tar.bz2 llvm-9a6b9bffa53bfa5e1a8373b31b2ddfa7b6bd7b30.tar.xz |
Add a backend option to warn on a given stack size limit.
Option: -mllvm -warn-stack-size=<limit>
Output (if limit is exceeded):
warning: Stack size limit exceeded (<actual size>) in <functionName>.
The longer term plan is to hook that to a clang warning.
PR:4072
<rdar://problem/13987214>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183552 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/PrologEpilogInserter.cpp')
-rw-r--r-- | lib/CodeGen/PrologEpilogInserter.cpp | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/lib/CodeGen/PrologEpilogInserter.cpp b/lib/CodeGen/PrologEpilogInserter.cpp index 959dd7df58..3a77af0cc4 100644 --- a/lib/CodeGen/PrologEpilogInserter.cpp +++ b/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<uint64_t> +WarnStackSize("warn-stack-size", cl::Hidden, + 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; |