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InstrProf: Instrumenter support for setting profile output from command line

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This change is the second of 3 patches to add support for specifying
the profile output from the command line via -fprofile-instr-generate=<path>,
where the specified output path/file will be overridden by the
LLVM_PROFILE_FILE environment variable.

This patch adds the necessary support to the llvm instrumenter, specifically
a new member of GCOVOptions for clang to save the specified filename, and
support for calling the new compiler-rt interface from __llvm_profile_init.

Patch by Teresa Johnson. Thanks!

llvm-svn: 236288
This commit is contained in:
Justin Bogner 2015-04-30 23:49:23 +00:00
parent 8e960d3ffb
commit 6f44b3969b
2 changed files with 26 additions and 3 deletions
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3
include/llvm/Transforms/Instrumentation.h
View File

@ -74,6 +74,9 @@ struct InstrProfOptions {
// Add the 'noredzone' attribute to added runtime library calls.
bool NoRedZone;
// Name of the profile file to use as output
std::string InstrProfileOutput;
};
/// Insert frontend instrumentation based profiling.

26
lib/Transforms/Instrumentation/InstrProfiling.cpp
View File

@ -97,7 +97,8 @@ private:
/// Add uses of our data variables and runtime hook.
void emitUses();
/// Create a static initializer for our data, on platforms that need it.
/// Create a static initializer for our data, on platforms that need it,
/// and for any profile output file that was specified.
void emitInitialization();
};
@ -328,8 +329,10 @@ void InstrProfiling::emitUses() {
}
void InstrProfiling::emitInitialization() {
std::string InstrProfileOutput = Options.InstrProfileOutput;
Constant *RegisterF = M->getFunction("__llvm_profile_register_functions");
if (!RegisterF)
if (!RegisterF && InstrProfileOutput.empty())
return;
// Create the initialization function.
@ -344,7 +347,24 @@ void InstrProfiling::emitInitialization() {
// Add the basic block and the necessary calls.
IRBuilder<> IRB(BasicBlock::Create(M->getContext(), "", F));
IRB.CreateCall(RegisterF);
if (RegisterF)
IRB.CreateCall(RegisterF);
if (!InstrProfileOutput.empty()) {
auto *Int8PtrTy = Type::getInt8PtrTy(M->getContext());
auto *SetNameTy = FunctionType::get(VoidTy, Int8PtrTy, false);
auto *SetNameF =
Function::Create(SetNameTy, GlobalValue::ExternalLinkage,
"__llvm_profile_set_filename_env_override", M);
// Create variable for profile name
Constant *ProfileNameConst =
ConstantDataArray::getString(M->getContext(), InstrProfileOutput, true);
GlobalVariable *ProfileName =
new GlobalVariable(*M, ProfileNameConst->getType(), true,
GlobalValue::PrivateLinkage, ProfileNameConst);
IRB.CreateCall(SetNameF, IRB.CreatePointerCast(ProfileName, Int8PtrTy));
}
IRB.CreateRetVoid();
appendToGlobalCtors(*M, F, 0);