[AOT] Support LLVM backend with C++ runtime #10753

areusch · 2022-03-24T00:10:05Z

This PR adds support for using the LLVM backend under the C++ runtime. Additional work is needed to support LLVM under the C runtime for microTVM uses.

#10280

github-actions · 2022-03-31T20:06:38Z

It has been a while since this PR was updated, please leave a review or address the outstanding comments. @areusch if this PR is still a work in progress, please convert it to a draft until it is ready for review.

manupak

I did a pass @areusch .

Few comments for docs / cleanup.

manupak · 2022-04-01T12:00:27Z

src/relay/backend/aot_executor_codegen.cc

+ * \param num the number to convert
+ * \return PrimExpr representing num
+ */
+inline PrimExpr ConstInt32(int32_t num) {


Maybe not needed for this PR, but should we move this as tir::make_const_int32 ?

changed to use tir::make_const, which i think handles it

manupak · 2022-04-01T12:00:53Z

src/relay/backend/aot_executor_codegen.cc

+  return tir::Evaluate(tir::Call(DataType::Int(32), tvm::tir::builtin::call_extern(),
+                                 {tvm::tir::StringImm(device_hook), context}));
+}
+}  // namespace


Why this empty namespace ?

to make this a "static" function aka it cannot be linked against from elsewhere

manupak · 2022-04-01T12:04:34Z

src/relay/backend/aot_executor_codegen.cc

+    tir::Stmt body = tir::SeqStmt::Flatten(prep_stmts_, call_stmts);
+
+    for (auto bind : let_binds_) {
+      body = tir::LetStmt(bind.first, bind.second, body);


Why do we need a Let binding here? Cant we just arg bind w/o introducing a let node here ?

tvm/src/tir/transforms/arg_binder.h

Lines 74 to 75 in 95df0eb

void Bind(const PrimExpr& arg, const PrimExpr& value, const std::string& arg_name,

bool with_let = false);

yeah sorry, this part is cruft and should get deleted.

manupak · 2022-04-01T12:11:08Z

src/relay/backend/aot_executor_codegen.cc

+}
+}  // namespace
+
+class AOTCallGenerator {


docs : we need docs for this but I think this part is still WIP as I did not see who uses this

good point--this is cruft from the old approach, before I started relying on LegalizePackedCalls/LowerTVMBuiltin, so can remove it now :)

manupak · 2022-04-01T12:22:09Z

src/target/llvm/codegen_cpu.cc

  PackedCall pc;
  std::string func_name = args[0].as<StringImmNode>()->value;
-  llvm::Value* handle = GetPackedFuncHandle(func_name);
+  llvm::Value* handle = nullptr;
+  if (use_string_lookup) {


I think we dont need to introduce handle just yet.

Shall we just merged to a single if/else down ? -- so its clear what happens when string-based function lookup is not used.

manupak · 2022-04-01T12:29:25Z

src/target/llvm/codegen_llvm.cc

  if (auto* ptr_op = op->op.as<OpNode>()) {
    auto call_op = GetRef<Op>(ptr_op);
-    if (op->op.same_as(builtin_call_extern_) || op->op.same_as(builtin_call_pure_extern_)) {
+    if (op->op.same_as(builtin_lookup_param_)) {
+      //      return llvm::ConstantInt::get(t_void_p_, 0);


manupak · 2022-04-01T12:30:29Z

src/target/llvm/codegen_llvm.h

@@ -389,6 +406,16 @@ class CodeGenLLVM : public ExprFunctor<llvm::Value*(const PrimExpr&)>,
                                             unsigned int shared_address_space, int alignment,
                                             llvm::GlobalValue::LinkageTypes linkage);

+  llvm::Argument* GetArg(const llvm::Function* function, int i) const {


Should we add docs for this ?

manupak · 2022-04-01T12:31:38Z

src/target/llvm/llvm_module.cc

+  // std::string tmp;
+  // llvm::raw_string_ostream stream(tmp);
+  // mod->print(stream, nullptr);
+  // LOG(INFO) << "LLVM metadata IR: " << stream.str();


manupak · 2022-04-01T12:32:23Z

src/target/metadata_module.cc

@@ -144,6 +144,12 @@ static runtime::Module CreateCppMetadataModule(
        auto metadata_module = CreateCSourceCppMetadataModule(runtime_metadata);
        metadata_module->Import(target_module);
        target_module = metadata_module;
+#ifdef TVM_LLVM_VERSION


Why this Ifdef ?

indicates USE_LLVM is ON. added a comment.

manupak · 2022-04-01T12:33:07Z

src/target/metadata_utils.cc

+ * \file tvm/target/metadata_utils.cc
+ * \brief Defines utility functions and classes for emitting metadata.
+ */
+#include "metadata_utils.h"


Please add docs for all the functions introduced here.

done (let me know if more are needed)

… name in llvm

* this is necessary to allow CodeGenCPU to emit calls that include resource_handle.

* previously I believe we required interface_api == "c", but this really means to generate C API bindings, and we are generating "packed" bindings. * I think "c" was chosen here because the distinction between interface-api and use-unpacked-api is confusing. "c" interface-api means to generate an entrypoint API for microcontrollers that accepts bare data buffers. "packed" interface-api means to generate a TVMBackendPackedCFunc entrypoint. use-unpacked-api forms the same determination for the operator functions. * A further confusion here is that there are two ways to call "packed" operator functions: tir.tvm_builtin_call_packed and tir.tvm_builtin_call_cpacked. This distinction describes whether or not to late-bind calls via TVMBackendGetFuncFromEnv. Right now, AOT only ever requires call_cpacked because target_host == target, and for all suitable target_host, we expect a single DSO-exportable runtime.Module. When we move away from this by introducing heterogeneous target support to AOT, we can use this as a condition to help us choose between call_cpacked and call_packed (and possibly add a compile-time option to assert it is call_cpacked, for situations where we really don't want call_packed).

areusch

@manupa-arm thanks for the review! i'm still working on fixing up the unit tests (the test_tir_usmp_transform_convert_pool_allocations_to_offsets needs updating but I don't quite understand how to do this with preflattened_buffer_map--will confer with @Lunderberg tomorrow).

would appreciate a second round of comments when you get a minute!

areusch · 2022-04-05T23:15:31Z

src/relay/backend/aot_executor_codegen.cc

+ * \param num the number to convert
+ * \return PrimExpr representing num
+ */
+inline PrimExpr ConstInt32(int32_t num) {


changed to use tir::make_const, which i think handles it

areusch · 2022-04-05T23:16:54Z

src/relay/backend/aot_executor_codegen.cc

+  return tir::Evaluate(tir::Call(DataType::Int(32), tvm::tir::builtin::call_extern(),
+                                 {tvm::tir::StringImm(device_hook), context}));
+}
+}  // namespace


to make this a "static" function aka it cannot be linked against from elsewhere

areusch · 2022-04-05T23:17:43Z

src/relay/backend/aot_executor_codegen.cc

+}
+}  // namespace
+
+class AOTCallGenerator {


good point--this is cruft from the old approach, before I started relying on LegalizePackedCalls/LowerTVMBuiltin, so can remove it now :)

areusch · 2022-04-05T23:18:18Z

src/relay/backend/aot_executor_codegen.cc

+    tir::Stmt body = tir::SeqStmt::Flatten(prep_stmts_, call_stmts);
+
+    for (auto bind : let_binds_) {
+      body = tir::LetStmt(bind.first, bind.second, body);


yeah sorry, this part is cruft and should get deleted.

areusch · 2022-04-05T23:19:50Z

src/target/llvm/codegen_cpu.cc

  PackedCall pc;
  std::string func_name = args[0].as<StringImmNode>()->value;
-  llvm::Value* handle = GetPackedFuncHandle(func_name);
+  llvm::Value* handle = nullptr;
+  if (use_string_lookup) {


areusch · 2022-04-05T23:21:03Z

src/target/llvm/codegen_llvm.cc

  if (auto* ptr_op = op->op.as<OpNode>()) {
    auto call_op = GetRef<Op>(ptr_op);
-    if (op->op.same_as(builtin_call_extern_) || op->op.same_as(builtin_call_pure_extern_)) {
+    if (op->op.same_as(builtin_lookup_param_)) {
+      //      return llvm::ConstantInt::get(t_void_p_, 0);


areusch · 2022-04-05T23:26:52Z

src/target/llvm/codegen_llvm.h

@@ -389,6 +406,16 @@ class CodeGenLLVM : public ExprFunctor<llvm::Value*(const PrimExpr&)>,
                                             unsigned int shared_address_space, int alignment,
                                             llvm::GlobalValue::LinkageTypes linkage);

+  llvm::Argument* GetArg(const llvm::Function* function, int i) const {


areusch · 2022-04-05T23:27:07Z

src/target/llvm/llvm_module.cc

+  // std::string tmp;
+  // llvm::raw_string_ostream stream(tmp);
+  // mod->print(stream, nullptr);
+  // LOG(INFO) << "LLVM metadata IR: " << stream.str();


areusch · 2022-04-05T23:27:53Z

src/target/metadata_module.cc

@@ -144,6 +144,12 @@ static runtime::Module CreateCppMetadataModule(
        auto metadata_module = CreateCSourceCppMetadataModule(runtime_metadata);
        metadata_module->Import(target_module);
        target_module = metadata_module;
+#ifdef TVM_LLVM_VERSION


indicates USE_LLVM is ON. added a comment.

areusch · 2022-04-05T23:28:20Z

src/target/metadata_utils.cc

+ * \file tvm/target/metadata_utils.cc
+ * \brief Defines utility functions and classes for emitting metadata.
+ */
+#include "metadata_utils.h"


done (let me know if more are needed)

Mousius

Hi @areusch,

I had a quick look over this, I've mostly identified areas where it'd be good to add some additional tests (especially the TIR script bit) - though I've avoided areas which aren't as well setup for testing. Other than that, it looks fine move forwards given the other reviews caught everything else 😸

Mousius · 2022-04-12T14:43:05Z

include/tvm/runtime/metadata_base.h

+  const char* get_c_struct_name() const final;
+
+  std::string get_element_c_struct_name() const {
+    CHECK(kind == MetadataKind::kMetadata)


Can you add an ASSERT_THROWS test for this?

Mousius · 2022-04-12T14:49:34Z

src/target/llvm/codegen_llvm.h

+    auto a = VisitExpr(e);
+    return a;


Either be explicit with the type or directly return the value from VisitExpr

oops, leftover from logging. fixed!

Mousius · 2022-04-12T14:54:22Z

python/tvm/script/tir/special_stmt.py

+            if data is None:
+                data = self.context.func_buffer_map[param].data
+
            buffer_name: str = f"{postflattened.name}_preflatten"
+            if align != -1:
+                if isinstance(align, IntImm):
+                    align = align.value
+                else:
+                    assert isinstance(align, int), f"align: want int or IntImm, got {align!r}"
+
+            if offset_factor != 0:
+                if isinstance(offset_factor, IntImm):
+                    offset_factor = offset_factor.value
+                else:
+                    assert isinstance(
+                        offset_factor, int
+                    ), f"offset_factor: want int or IntImm, got {offset_factor!r}"
+


Could we add some unit tests for these cases?

Mousius · 2022-04-12T14:58:38Z

src/target/metadata_utils.cc

+
+DiscoverArraysVisitor::DiscoverArraysVisitor(std::vector<DiscoveredArray>* queue) : queue_{queue} {}
+
+std::string address_from_parts(const std::vector<std::string>& parts) {


Should this be AddressFromParts to match the coding conventions?

Also, should this be in the middle of the DiscoverArraysVisitor definitions?

good catch, fixed both

Mousius · 2022-04-12T15:02:18Z

src/target/metadata_utils.cc

+void DiscoverArraysVisitor::Visit(const char* key, ObjectRef* value) {
+  address_parts_.push_back(key);
+  if (value->as<runtime::metadata::MetadataBaseNode>() != nullptr) {
+    auto metadata = Downcast<runtime::metadata::MetadataBase>(*value);
+    const runtime::metadata::MetadataArrayNode* arr =
+        value->as<runtime::metadata::MetadataArrayNode>();
+    if (arr != nullptr) {
+      for (unsigned int i = 0; i < arr->array.size(); i++) {
+        ObjectRef o = arr->array[i];
+        if (o.as<runtime::metadata::MetadataBaseNode>() != nullptr) {
+          std::stringstream ss;
+          ss << i;
+          address_parts_.push_back(ss.str());
+          runtime::metadata::MetadataBase metadata = Downcast<runtime::metadata::MetadataBase>(o);
+          ReflectionVTable::Global()->VisitAttrs(metadata.operator->(), this);
+          address_parts_.pop_back();
+        }
+      }
+
+      queue_->push_back(std::make_tuple(address_from_parts(address_parts_),
+                                        Downcast<runtime::metadata::MetadataArray>(metadata)));
+    } else {
+      ReflectionVTable::Global()->VisitAttrs(metadata.operator->(), this);
+    }
+  }
+  address_parts_.pop_back();
+}


Is it possible to add some testing for these visitors (DiscoverComplexTypesVisitor and DiscoverArraysVisitor) whilst we're creating this file afresh?

areusch

thanks for the round of comments @Mousius! would appreciate another look here

areusch · 2022-04-12T23:35:41Z

include/tvm/runtime/metadata_base.h

+  const char* get_c_struct_name() const final;
+
+  std::string get_element_c_struct_name() const {
+    CHECK(kind == MetadataKind::kMetadata)


areusch · 2022-04-13T17:57:21Z

src/target/metadata_utils.cc

+void DiscoverArraysVisitor::Visit(const char* key, ObjectRef* value) {
+  address_parts_.push_back(key);
+  if (value->as<runtime::metadata::MetadataBaseNode>() != nullptr) {
+    auto metadata = Downcast<runtime::metadata::MetadataBase>(*value);
+    const runtime::metadata::MetadataArrayNode* arr =
+        value->as<runtime::metadata::MetadataArrayNode>();
+    if (arr != nullptr) {
+      for (unsigned int i = 0; i < arr->array.size(); i++) {
+        ObjectRef o = arr->array[i];
+        if (o.as<runtime::metadata::MetadataBaseNode>() != nullptr) {
+          std::stringstream ss;
+          ss << i;
+          address_parts_.push_back(ss.str());
+          runtime::metadata::MetadataBase metadata = Downcast<runtime::metadata::MetadataBase>(o);
+          ReflectionVTable::Global()->VisitAttrs(metadata.operator->(), this);
+          address_parts_.pop_back();
+        }
+      }
+
+      queue_->push_back(std::make_tuple(address_from_parts(address_parts_),
+                                        Downcast<runtime::metadata::MetadataArray>(metadata)));
+    } else {
+      ReflectionVTable::Global()->VisitAttrs(metadata.operator->(), this);
+    }
+  }
+  address_parts_.pop_back();
+}


areusch · 2022-04-13T19:01:43Z

python/tvm/script/tir/special_stmt.py

+            if data is None:
+                data = self.context.func_buffer_map[param].data
+
            buffer_name: str = f"{postflattened.name}_preflatten"
+            if align != -1:
+                if isinstance(align, IntImm):
+                    align = align.value
+                else:
+                    assert isinstance(align, int), f"align: want int or IntImm, got {align!r}"
+
+            if offset_factor != 0:
+                if isinstance(offset_factor, IntImm):
+                    offset_factor = offset_factor.value
+                else:
+                    assert isinstance(
+                        offset_factor, int
+                    ), f"offset_factor: want int or IntImm, got {offset_factor!r}"
+


areusch · 2022-04-13T19:11:24Z

src/target/llvm/codegen_llvm.h

+    auto a = VisitExpr(e);
+    return a;


oops, leftover from logging. fixed!

areusch · 2022-04-13T19:14:00Z

src/target/metadata_utils.cc

+
+DiscoverArraysVisitor::DiscoverArraysVisitor(std::vector<DiscoveredArray>* queue) : queue_{queue} {}
+
+std::string address_from_parts(const std::vector<std::string>& parts) {


good catch, fixed both

areusch · 2022-04-14T00:21:52Z

oops, it seems we ran into some kind of CI bug :(

i don't think PR will start testing til it's merged, unfortunately will need a review on #11007 before we can retest this one. Nevertheless, it's ready for another look.

areusch · 2022-04-14T00:22:32Z

also, did push this #11007 on top of this PR to exercise the fix, you can see it here: https://ci.tlcpack.ai/blue/organizations/jenkins/tvm/detail/areusch-test-jenkinsfile-merge-fix/3/pipeline/

Mousius

LGTM once CI passes 😸

masahi · 2022-04-15T09:06:06Z

src/target/llvm/codegen_llvm.h

@@ -481,6 +518,8 @@ void CodeGenLLVM::AddFunctionsOrdered(IterType begin, IterType end, ConvType pfu
    return name_a < name_b;
  });
  for (auto& f : funcs) {
+    auto global_symbol = f->GetAttr<String>(tvm::attr::kGlobalSymbol);
+    LOG(INFO) << "Adding " << static_cast<std::string>(global_symbol.value());


Please remove this diff, I see codegen_llvm.h:522: Adding ... all over the place in the log https://ci.tlcpack.ai/blue/organizations/jenkins/tvm/detail/PR-10753/19/pipeline

Sorry I remember I added this one

sorry can you also remove auto global_symbol = f->GetAttr<String>(tvm::attr::kGlobalSymbol); change since global_symbol is not used

We can address this in a follow-up

* add get_c_struct_name() method to Metadata to distinguish struct type name in llvm * add metadata serialization support to llvm codegen * Organize MetadataQueuer into a separate file. * Add DiscoverArraysVisitor to metadata_utils * Fill DLTensor metadata in LegalizePackedCalls. * Improve error message from Call asserts * Pass non-String device_context down to codegen. * this is necessary to allow CodeGenCPU to emit calls that include resource_handle. * Scope usage of lvalue refs in LowerTVMBuiltin to avoid corrupt memory. * test fixes * Also fill preflattened_buffer_map (TODO, maybe don't do this) * Fix C codegen. * Set USMP elem_offset to 0. * Clarify calculation of byte_offset from elem_offset. * fix tests * Fix arm compile warning * Fix hexagon test. * previously I believe we required interface_api == "c", but this really means to generate C API bindings, and we are generating "packed" bindings. * I think "c" was chosen here because the distinction between interface-api and use-unpacked-api is confusing. "c" interface-api means to generate an entrypoint API for microcontrollers that accepts bare data buffers. "packed" interface-api means to generate a TVMBackendPackedCFunc entrypoint. use-unpacked-api forms the same determination for the operator functions. * A further confusion here is that there are two ways to call "packed" operator functions: tir.tvm_builtin_call_packed and tir.tvm_builtin_call_cpacked. This distinction describes whether or not to late-bind calls via TVMBackendGetFuncFromEnv. Right now, AOT only ever requires call_cpacked because target_host == target, and for all suitable target_host, we expect a single DSO-exportable runtime.Module. When we move away from this by introducing heterogeneous target support to AOT, we can use this as a condition to help us choose between call_cpacked and call_packed (and possibly add a compile-time option to assert it is call_cpacked, for situations where we really don't want call_packed). * Document T.preflattened_buffer * Fix test_aot_legalize_packed_calls * Address manupa comments * Fix convert_pool_allocations_to_offsets test. * lint * Fix T.preflattened_buffer * Add preflattened_buffer_map to TIRTextPrinter * Fix tests * Fix BYOC * Fix invoking C device API. * remove comments * Address Mousius comments * lint * lint * Fix GMock linking on new CMake * address masahi comment Co-authored-by: Masahiro Masuda <masahi129@gmail.com>

areusch mentioned this pull request Mar 24, 2022

[Tracking Issue] Module-based Model Runtime Interface for AOT #10280

Closed

5 tasks

areusch force-pushed the mbmr-aot-llvm branch 4 times, most recently from b98da99 to 111efec Compare March 24, 2022 20:03

manupak reviewed Apr 1, 2022

View reviewed changes

masahi and others added 20 commits April 5, 2022 16:41

add get_c_struct_name() method to Metadata to distinguish struct type…

3c44f7b

… name in llvm

add metadata serialization support to llvm codegen

783aa43

Organize MetadataQueuer into a separate file.

f991e19

Add DiscoverArraysVisitor to metadata_utils

f6b1314

Fill DLTensor metadata in LegalizePackedCalls.

e8e93fc

Improve error message from Call asserts

1477383

Pass non-String device_context down to codegen.

1641cfd

* this is necessary to allow CodeGenCPU to emit calls that include resource_handle.

Scope usage of lvalue refs in LowerTVMBuiltin to avoid corrupt memory.

58da108

test fixes

cab2df8

Also fill preflattened_buffer_map (TODO, maybe don't do this)

43ad6d4

Fix C codegen.

acba246

Set USMP elem_offset to 0.

fe910e9

Clarify calculation of byte_offset from elem_offset.

1558cf7

fix tests

4290e28

Fix arm compile warning

74283a7

Document T.preflattened_buffer

48478c7

Fix test_aot_legalize_packed_calls

4bf22e9

Address manupa comments

5de35ef

Fix convert_pool_allocations_to_offsets test.

d756d79

areusch force-pushed the mbmr-aot-llvm branch from 111efec to d756d79 Compare April 7, 2022 03:34

areusch commented Apr 7, 2022

View reviewed changes

lint

6563534

areusch added 4 commits April 7, 2022 16:37

Fix T.preflattened_buffer

e39deed

Add preflattened_buffer_map to TIRTextPrinter

f2138d5

Fix tests

c257f7f

Fix BYOC

4705a18

areusch force-pushed the mbmr-aot-llvm branch from 7f03b7d to 4705a18 Compare April 8, 2022 05:16

Fix invoking C device API.

9642548

areusch force-pushed the mbmr-aot-llvm branch from 19b0106 to 9642548 Compare April 8, 2022 19:11

remove comments

66f0898

Mousius requested changes Apr 12, 2022

View reviewed changes

areusch added 2 commits April 13, 2022 12:15

Address Mousius comments

1b36e6e

lint

792245a

areusch commented Apr 13, 2022

View reviewed changes

Mousius approved these changes Apr 14, 2022

View reviewed changes

masahi reviewed Apr 15, 2022

View reviewed changes

areusch added 2 commits April 18, 2022 11:03

Merge remote-tracking branch 'origin/main' into mbmr-aot-llvm

8bbb750

lint

131722e

areusch force-pushed the mbmr-aot-llvm branch from 3ef041e to 131722e Compare April 18, 2022 18:08

areusch added 2 commits April 18, 2022 14:08

Fix GMock linking on new CMake

ee1877c

address masahi comment

374da00

areusch merged commit 4178617 into apache:main Apr 19, 2022

driazati mentioned this pull request Jul 14, 2022

TVM v0.9.0.rc0 Release Candidate Notes #12102

Closed

	void Bind(const PrimExpr& arg, const PrimExpr& value, const std::string& arg_name,
	bool with_let = false);


		DiscoverArraysVisitor::DiscoverArraysVisitor(std::vector<DiscoveredArray>* queue) : queue_{queue} {}

		std::string address_from_parts(const std::vector<std::string>& parts) {

[AOT] Support LLVM backend with C++ runtime #10753

[AOT] Support LLVM backend with C++ runtime #10753

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areusch commented Mar 24, 2022

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areusch commented Apr 14, 2022

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