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DebugInfo: Keep track of subprograms who's arguments have been promoted.

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Matching behavior with DeadArgumentElimination (and leveraging some
now-common infrastructure), keep track of the function from debug info
metadata if arguments are promoted.

This may produce interesting debug info - since the arguments may be
missing or of different types... but at least backtraces, inlining, etc,
will be correct.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212128 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie
2014-07-01 21:13:37 +00:00
parent d7ffdcdfcf
commit 49ec6e933f
2 changed files with 21 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
lib/Transforms/IPO/ArgumentPromotion.cpp
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@@ -39,6 +39,7 @@
#include "llvm/IR/CFG.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/LLVMContext.h"
@@ -80,8 +81,10 @@ namespace {
CallGraphNode *DoPromotion(Function *F,
SmallPtrSet<Argument*, 8> &ArgsToPromote,
SmallPtrSet<Argument*, 8> &ByValArgsToTransform);
bool doInitialization(CallGraph &CG) override;
/// The maximum number of elements to expand, or 0 for unlimited.
unsigned maxElements;
DenseMap<Function *, DISubprogram> FunctionDIs;
};
}
@@ -604,6 +607,10 @@ CallGraphNode *ArgPromotion::DoPromotion(Function *F,
Function *NF = Function::Create(NFTy, F->getLinkage(), F->getName());
NF->copyAttributesFrom(F);
// Patch the pointer to LLVM function in debug info descriptor.
auto DI = FunctionDIs.find(F);
if (DI != FunctionDIs.end())
DI->second.replaceFunction(NF);
DEBUG(dbgs() << "ARG PROMOTION: Promoting to:" << *NF << "\n"
<< "From: " << *F);
@@ -903,3 +910,8 @@ CallGraphNode *ArgPromotion::DoPromotion(Function *F,
return NF_CGN;
}
bool ArgPromotion::doInitialization(CallGraph &CG) {
FunctionDIs = makeSubprogramMap(CG.getModule());
return CallGraphSCCPass::doInitialization(CG);
}