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Add module instruction stats #104178

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Add module instruction stats #104178

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e0fb2a0
add instruction count helper function
csmoe Nov 3, 2022
b6f9ed1
print stats
csmoe Nov 5, 2022
9ada004
dump json
csmoe Nov 9, 2022
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4 changes: 4 additions & 0 deletions compiler/rustc_codegen_llvm/src/back/write.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -567,6 +567,10 @@ pub(crate) unsafe fn codegen(
let llcx = &*module.module_llvm.llcx;
let tm = &*module.module_llvm.tm;
let module_name = module.name.clone();
let stats =
llvm::build_string(|s| unsafe { llvm::LLVMRustModuleInstructionStats(&llmod, s) })
.expect("cannot get module instruction stats");
println!("llvm-module: {stats}");
let module_name = Some(&module_name[..]);
let handlers = DiagnosticHandlers::new(cgcx, diag_handler, llcx);

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2 changes: 2 additions & 0 deletions compiler/rustc_codegen_llvm/src/llvm/ffi.rs
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Expand Up @@ -2389,6 +2389,8 @@ extern "C" {
pub fn LLVMRustModuleBufferLen(p: &ModuleBuffer) -> usize;
pub fn LLVMRustModuleBufferFree(p: &'static mut ModuleBuffer);
pub fn LLVMRustModuleCost(M: &Module) -> u64;
#[allow(improper_ctypes)]
pub fn LLVMRustModuleInstructionStats(M: &Module, Str: &RustString);

pub fn LLVMRustThinLTOBufferCreate(M: &Module, is_thin: bool) -> &'static mut ThinLTOBuffer;
pub fn LLVMRustThinLTOBufferFree(M: &'static mut ThinLTOBuffer);
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1 change: 1 addition & 0 deletions compiler/rustc_llvm/llvm-wrapper/LLVMWrapper.h
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Expand Up @@ -15,6 +15,7 @@
#include "llvm/Support/Debug.h"
#include "llvm/Support/DynamicLibrary.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/JSON.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/Memory.h"
#include "llvm/Support/SourceMgr.h"
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22 changes: 22 additions & 0 deletions compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
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Expand Up @@ -1696,6 +1696,28 @@ LLVMRustModuleCost(LLVMModuleRef M) {
return std::distance(std::begin(f), std::end(f));
}

extern "C" void
LLVMRustModuleInstructionStats(LLVMModuleRef M, RustStringRef Str)
{
RawRustStringOstream OS(Str);
llvm::json::OStream JOS(OS);
auto Module = unwrap(M);

JOS.object([&]
{
JOS.attribute("module", Module->getName());
JOS.attribute("total", Module->getInstructionCount());
JOS.attributeArray("functions", [&] {
auto functions = Module->functions();
for (auto &f: functions) {
JOS.object([&] {
JOS.attribute(f.getName(),f.getInstructionCount());
});
}

}); });
}

// Vector reductions:
extern "C" LLVMValueRef
LLVMRustBuildVectorReduceFAdd(LLVMBuilderRef B, LLVMValueRef Acc, LLVMValueRef Src) {
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