[lli] Revisit Orc debug output tests (#76822)

Integrate in-memory debug-info dumps into the `--orc-lazy-debug`
command-line option instead of exposing built-in functions to be called
from JITed code. This reduces overall amount of code (removing
`ExecutionUtils.cpp`) and seems cleaner anyway.

All existing items of `OrcDumpKind` work on IR level and run in the
IR-transform step of the JIT. The newly added `DumpDebugDescriptor` and
`DumpDebugObjects` must run after debug-registration and thus are
deferred to the Object-transform step of the JIT. This separation is the
major side-effect of the patch.
This commit is contained in:
Stefan Gränitz
2024-01-22 21:24:57 +01:00
committed by GitHub
parent 02a28ee8d9
commit 263efb044a
7 changed files with 170 additions and 322 deletions

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@@ -1,29 +1,17 @@
; REQUIRES: native && x86_64-linux
; REQUIRES: native && target-x86_64
; RUN: lli --jit-linker=rtdyld \
; RUN: --generate=__dump_jit_debug_descriptor %s | FileCheck %s
; RUN: lli --jit-linker=rtdyld --orc-lazy-debug=jit-debug-descriptor %s 2>&1 | FileCheck %s
; RUN: lli --jit-linker=jitlink --orc-lazy-debug=jit-debug-descriptor %s 2>&1 | FileCheck %s
;
; RUN: lli --jit-linker=jitlink \
; RUN: --generate=__dump_jit_debug_descriptor %s | FileCheck %s
; Initial entry should be empty:
; CHECK: jit_debug_descriptor 0x0000000000000000
;
; CHECK: Reading __jit_debug_descriptor at 0x{{.*}}
; CHECK: Version: 1
; CHECK: Action: JIT_REGISTER_FN
; CHECK: Entry Symbol File Size Previous Entry
; CHECK: [ 0] 0x{{.*}} 0x{{.*}} {{.*}} 0x0000000000000000
target triple = "x86_64-unknown-unknown-elf"
; Built-in symbol provided by the JIT
declare void @__dump_jit_debug_descriptor(ptr)
; Host-process symbol from the GDB JIT interface
@__jit_debug_descriptor = external global i8, align 1
; After adding the module it must not be empty anymore:
; CHECK: jit_debug_descriptor 0x
; CHECK-NOT: 000000000000000
; CHECK-SAME: {{[048c]}}
define i32 @main() !dbg !9 {
%1 = alloca i32, align 4
store i32 0, ptr %1, align 4
call void @__dump_jit_debug_descriptor(ptr @__jit_debug_descriptor), !dbg !13
ret i32 0, !dbg !14
}

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@@ -1,82 +0,0 @@
; REQUIRES: native && x86_64-linux
; In-memory debug-object contains some basic DWARF
;
; RUN: lli --jit-linker=rtdyld \
; RUN: --generate=__dump_jit_debug_objects %s | llvm-dwarfdump --diff - | FileCheck %s
;
; RUN: lli --jit-linker=jitlink \
; RUN: --generate=__dump_jit_debug_objects %s | llvm-dwarfdump --diff - | FileCheck %s
;
; CHECK: -: file format elf64-x86-64
; CHECK: .debug_info contents:
; CHECK: 0x00000000: Compile Unit: length = 0x00000047, format = DWARF32, version = 0x0004, abbr_offset = 0x0000, addr_size = 0x08 (next unit at 0x0000004b)
; CHECK: DW_TAG_compile_unit
; CHECK: DW_AT_producer ("compiler version")
; CHECK: DW_AT_language (DW_LANG_C99)
; CHECK: DW_AT_name ("source-file.c")
; CHECK: DW_AT_stmt_list ()
; CHECK: DW_AT_comp_dir ("/workspace")
; CHECK: DW_AT_low_pc ()
; CHECK: DW_AT_high_pc ()
; CHECK: DW_TAG_subprogram
; CHECK: DW_AT_low_pc ()
; CHECK: DW_AT_high_pc ()
; CHECK: DW_AT_frame_base (DW_OP_reg7 RSP)
; CHECK: DW_AT_name ("main")
; CHECK: DW_AT_decl_file ("/workspace/source-file.c")
; CHECK: DW_AT_decl_line (4)
; CHECK: DW_AT_type ("int")
; CHECK: DW_AT_external (true)
; CHECK: DW_TAG_base_type
; CHECK: DW_AT_name ("int")
; CHECK: DW_AT_encoding (DW_ATE_signed)
; CHECK: DW_AT_byte_size (0x04)
; CHECK: NULL
; Text section of the in-memory debug-object has a non-null load-address
;
; RUN: lli --jit-linker=rtdyld \
; RUN: --generate=__dump_jit_debug_objects %s | llvm-objdump --section-headers - | \
; RUN: FileCheck --check-prefix=CHECK_LOAD_ADDR %s
;
; RUN: lli --jit-linker=jitlink \
; RUN: --generate=__dump_jit_debug_objects %s | llvm-objdump --section-headers - | \
; RUN: FileCheck --check-prefix=CHECK_LOAD_ADDR %s
;
; CHECK_LOAD_ADDR-NOT: {{[0-9]*}} .ltext {{.*}} 0000000000000000 TEXT
target triple = "x86_64-unknown-unknown-elf"
; Built-in symbol provided by the JIT
declare void @__dump_jit_debug_objects(ptr)
; Host-process symbol from the GDB JIT interface
@__jit_debug_descriptor = external global i8, align 1
define i32 @main() !dbg !9 {
%1 = alloca i32, align 4
store i32 0, ptr %1, align 4
call void @__dump_jit_debug_objects(ptr @__jit_debug_descriptor), !dbg !13
ret i32 0, !dbg !14
}
!llvm.module.flags = !{!0, !1, !2, !3, !4}
!llvm.dbg.cu = !{!5}
!llvm.ident = !{!8}
!0 = !{i32 2, !"SDK Version", [3 x i32] [i32 10, i32 15, i32 6]}
!1 = !{i32 7, !"Dwarf Version", i32 4}
!2 = !{i32 2, !"Debug Info Version", i32 3}
!3 = !{i32 1, !"wchar_size", i32 4}
!4 = !{i32 7, !"PIC Level", i32 2}
!5 = distinct !DICompileUnit(language: DW_LANG_C99, file: !6, producer: "compiler version", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !7, nameTableKind: None)
!6 = !DIFile(filename: "source-file.c", directory: "/workspace")
!7 = !{}
!8 = !{!"compiler version"}
!9 = distinct !DISubprogram(name: "main", scope: !6, file: !6, line: 4, type: !10, scopeLine: 4, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !7)
!10 = !DISubroutineType(types: !11)
!11 = !{!12}
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!13 = !DILocation(line: 5, column: 3, scope: !9)
!14 = !DILocation(line: 6, column: 3, scope: !9)

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@@ -0,0 +1,62 @@
; REQUIRES: native && x86_64-linux
; In-memory debug-objects contain DWARF
;
; RUN: lli --jit-linker=rtdyld --orc-lazy-debug=jit-debug-objects %s | llvm-dwarfdump --diff - | FileCheck %s
; RUN: lli --jit-linker=jitlink --orc-lazy-debug=jit-debug-objects %s | llvm-dwarfdump --diff - | FileCheck %s
;
; CHECK: -: file format elf64-x86-64
; TODO: Synthesized Mach-O objects error out with:
; truncated or malformed object (offset field of section 8 in
; LC_SEGMENT_64 command 0 extends past the end of the file)
;
; CHECK: .debug_info contents:
; CHECK: format = DWARF32
; CHECK: DW_TAG_compile_unit
; CHECK: DW_AT_producer ("clang version 18.0.0git")
; CHECK: DW_AT_language (DW_LANG_C11)
; CHECK: DW_AT_name ("source-file.c")
; CHECK: DW_AT_comp_dir ("/workspace")
; CHECK: DW_TAG_subprogram
; CHECK: DW_AT_frame_base (DW_OP_reg7 RSP)
; CHECK: DW_AT_name ("main")
; CHECK: DW_AT_decl_file ("/workspace/source-file.c")
; CHECK: DW_AT_decl_line (1)
; CHECK: DW_AT_type ("int")
; CHECK: DW_AT_external (true)
; CHECK: DW_TAG_base_type
; CHECK: DW_AT_name ("int")
; CHECK: DW_AT_encoding (DW_ATE_signed)
; CHECK: DW_AT_byte_size (0x04)
; CHECK: NULL
; Text section of the in-memory debug-objects have non-null load-address
;
; RUN: lli --jit-linker=rtdyld --orc-lazy-debug=jit-debug-objects %s | \
; RUN: llvm-objdump --section-headers - | \
; RUN: FileCheck --check-prefix=CHECK_LOAD_ADDR %s
; RUN: lli --jit-linker=jitlink --orc-lazy-debug=jit-debug-objects %s | \
; RUN: llvm-objdump --section-headers - | \
; RUN: FileCheck --check-prefix=CHECK_LOAD_ADDR %s
;
; CHECK_LOAD_ADDR: .text
; CHECK_LOAD_ADDR-NOT: 0000000000000000
; CHECK_LOAD_ADDR-SAME: TEXT
define i32 @main() !dbg !3 {
entry:
ret i32 0, !dbg !8
}
!llvm.module.flags = !{!0}
!llvm.dbg.cu = !{!2}
!0 = !{i32 2, !"Debug Info Version", i32 3}
!1 = !DIFile(filename: "source-file.c", directory: "/workspace")
!2 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang version 18.0.0git", emissionKind: FullDebug)
!3 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 1, type: !4, scopeLine: 1, unit: !2, retainedNodes: !7)
!4 = !DISubroutineType(types: !5)
!5 = !{!6}
!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!7 = !{}
!8 = !DILocation(line: 1, column: 14, scope: !3)

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@@ -53,7 +53,6 @@ endif( LLVM_USE_PERF )
add_llvm_tool(lli
lli.cpp
ExecutionUtils.cpp
DEPENDS
intrinsics_gen

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@@ -1,122 +0,0 @@
//===---- ExecutionUtils.cpp - Utilities for executing functions in lli ---===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "ExecutionUtils.h"
#include "llvm/ExecutionEngine/Orc/TargetProcess/JITLoaderGDB.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/raw_ostream.h"
#include <cstdint>
#include <vector>
namespace llvm {
template <typename... Ts> static void outsv(const char *Fmt, Ts &&...Vals) {
outs() << formatv(Fmt, Vals...);
}
static const char *actionFlagToStr(uint32_t ActionFlag) {
switch (ActionFlag) {
case JIT_NOACTION:
return "JIT_NOACTION";
case JIT_REGISTER_FN:
return "JIT_REGISTER_FN";
case JIT_UNREGISTER_FN:
return "JIT_UNREGISTER_FN";
}
return "<invalid action_flag>";
}
// Declarations follow the GDB JIT interface (version 1, 2009) and must match
// those of the DYLD used for testing.
//
// Sample output:
//
// Reading __jit_debug_descriptor at 0x0000000000404048
//
// Version: 0
// Action: JIT_REGISTER_FN
//
// Entry Symbol File Size Previous Entry
// [ 0] 0x0000000000451290 0x0000000000002000 200 0x0000000000000000
// [ 1] 0x0000000000451260 0x0000000000001000 100 0x0000000000451290
// ...
//
static void dumpDebugDescriptor(void *Addr) {
outsv("Reading __jit_debug_descriptor at {0}\n\n", Addr);
jit_descriptor *Descriptor = reinterpret_cast<jit_descriptor *>(Addr);
outsv("Version: {0}\n", Descriptor->version);
outsv("Action: {0}\n\n", actionFlagToStr(Descriptor->action_flag));
outsv("{0,11} {1,24} {2,15} {3,14}\n", "Entry", "Symbol File", "Size",
"Previous Entry");
unsigned Idx = 0;
for (auto *Entry = Descriptor->first_entry; Entry; Entry = Entry->next_entry)
outsv("[{0,2}] {1:X16} {2:X16} {3,8:D} {4}\n", Idx++, Entry,
reinterpret_cast<const void *>(Entry->symfile_addr),
Entry->symfile_size, Entry->prev_entry);
}
static LLIBuiltinFunctionGenerator *Generator = nullptr;
static void dumpDebugObjects(void *Addr) {
jit_descriptor *Descriptor = reinterpret_cast<jit_descriptor *>(Addr);
for (auto *Entry = Descriptor->first_entry; Entry; Entry = Entry->next_entry)
Generator->appendDebugObject(Entry->symfile_addr, Entry->symfile_size);
}
LLIBuiltinFunctionGenerator::LLIBuiltinFunctionGenerator(
std::vector<BuiltinFunctionKind> Enabled, orc::MangleAndInterner &Mangle)
: TestOut(nullptr) {
Generator = this;
for (BuiltinFunctionKind F : Enabled) {
switch (F) {
case BuiltinFunctionKind::DumpDebugDescriptor:
expose(Mangle("__dump_jit_debug_descriptor"), &dumpDebugDescriptor);
break;
case BuiltinFunctionKind::DumpDebugObjects:
expose(Mangle("__dump_jit_debug_objects"), &dumpDebugObjects);
TestOut = createToolOutput();
break;
}
}
}
Error LLIBuiltinFunctionGenerator::tryToGenerate(
orc::LookupState &LS, orc::LookupKind K, orc::JITDylib &JD,
orc::JITDylibLookupFlags JDLookupFlags,
const orc::SymbolLookupSet &Symbols) {
orc::SymbolMap NewSymbols;
for (const auto &NameFlags : Symbols) {
auto It = BuiltinFunctions.find(NameFlags.first);
if (It != BuiltinFunctions.end())
NewSymbols.insert(*It);
}
if (NewSymbols.empty())
return Error::success();
return JD.define(absoluteSymbols(std::move(NewSymbols)));
}
// static
std::unique_ptr<ToolOutputFile>
LLIBuiltinFunctionGenerator::createToolOutput() {
std::error_code EC;
auto TestOut = std::make_unique<ToolOutputFile>("-", EC, sys::fs::OF_None);
if (EC) {
errs() << "Error creating tool output file: " << EC.message() << '\n';
exit(1);
}
return TestOut;
}
} // namespace llvm

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@@ -1,60 +0,0 @@
//===- ExecutionUtils.h - Utilities for executing code in lli ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Contains utilities for executing code in lli.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_LLI_EXECUTIONUTILS_H
#define LLVM_TOOLS_LLI_EXECUTIONUTILS_H
#include "llvm/ExecutionEngine/JITSymbol.h"
#include "llvm/ExecutionEngine/Orc/Core.h"
#include "llvm/ExecutionEngine/Orc/Mangling.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ToolOutputFile.h"
#include <memory>
#include <utility>
namespace llvm {
enum class BuiltinFunctionKind {
DumpDebugDescriptor,
DumpDebugObjects,
};
// Utility class to expose symbols for special-purpose functions to the JIT.
class LLIBuiltinFunctionGenerator : public orc::DefinitionGenerator {
public:
LLIBuiltinFunctionGenerator(std::vector<BuiltinFunctionKind> Enabled,
orc::MangleAndInterner &Mangle);
Error tryToGenerate(orc::LookupState &LS, orc::LookupKind K,
orc::JITDylib &JD, orc::JITDylibLookupFlags JDLookupFlags,
const orc::SymbolLookupSet &Symbols) override;
void appendDebugObject(const char *Addr, size_t Size) {
TestOut->os().write(Addr, Size);
}
private:
orc::SymbolMap BuiltinFunctions;
std::unique_ptr<ToolOutputFile> TestOut;
template <typename T> void expose(orc::SymbolStringPtr Name, T *Handler) {
BuiltinFunctions[Name] = {orc::ExecutorAddr::fromPtr(Handler),
JITSymbolFlags::Exported};
}
static std::unique_ptr<ToolOutputFile> createToolOutput();
};
} // end namespace llvm
#endif // LLVM_TOOLS_LLI_EXECUTIONUTILS_H

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@@ -12,7 +12,6 @@
//
//===----------------------------------------------------------------------===//
#include "ExecutionUtils.h"
#include "ForwardingMemoryManager.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Bitcode/BitcodeReader.h"
@@ -33,6 +32,7 @@
#include "llvm/ExecutionEngine/Orc/ExecutionUtils.h"
#include "llvm/ExecutionEngine/Orc/JITTargetMachineBuilder.h"
#include "llvm/ExecutionEngine/Orc/LLJIT.h"
#include "llvm/ExecutionEngine/Orc/ObjectTransformLayer.h"
#include "llvm/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.h"
#include "llvm/ExecutionEngine/Orc/SimpleRemoteEPC.h"
#include "llvm/ExecutionEngine/Orc/SymbolStringPool.h"
@@ -62,6 +62,7 @@
#include "llvm/Support/Program.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/WithColor.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/TargetParser/Triple.h"
@@ -254,35 +255,29 @@ namespace {
NoDump,
DumpFuncsToStdOut,
DumpModsToStdOut,
DumpModsToDisk
DumpModsToDisk,
DumpDebugDescriptor,
DumpDebugObjects,
};
cl::opt<DumpKind> OrcDumpKind(
"orc-lazy-debug", cl::desc("Debug dumping for the orc-lazy JIT."),
cl::init(DumpKind::NoDump),
cl::values(clEnumValN(DumpKind::NoDump, "no-dump",
"Don't dump anything."),
clEnumValN(DumpKind::DumpFuncsToStdOut, "funcs-to-stdout",
"Dump function names to stdout."),
clEnumValN(DumpKind::DumpModsToStdOut, "mods-to-stdout",
"Dump modules to stdout."),
clEnumValN(DumpKind::DumpModsToDisk, "mods-to-disk",
"Dump modules to the current "
"working directory. (WARNING: "
"will overwrite existing files).")),
cl::Hidden);
cl::list<BuiltinFunctionKind> GenerateBuiltinFunctions(
"generate",
cl::desc("Provide built-in functions for access by JITed code "
"(jit-kind=orc-lazy only)"),
cl::values(clEnumValN(BuiltinFunctionKind::DumpDebugDescriptor,
"__dump_jit_debug_descriptor",
"Dump __jit_debug_descriptor contents to stdout"),
clEnumValN(BuiltinFunctionKind::DumpDebugObjects,
"__dump_jit_debug_objects",
"Dump __jit_debug_descriptor in-memory debug "
"objects as tool output")),
cl::values(
clEnumValN(DumpKind::NoDump, "no-dump", "Don't dump anything."),
clEnumValN(DumpKind::DumpFuncsToStdOut, "funcs-to-stdout",
"Dump function names to stdout."),
clEnumValN(DumpKind::DumpModsToStdOut, "mods-to-stdout",
"Dump modules to stdout."),
clEnumValN(DumpKind::DumpModsToDisk, "mods-to-disk",
"Dump modules to the current "
"working directory. (WARNING: "
"will overwrite existing files)."),
clEnumValN(DumpKind::DumpDebugDescriptor, "jit-debug-descriptor",
"Dump __jit_debug_descriptor contents to stdout"),
clEnumValN(DumpKind::DumpDebugObjects, "jit-debug-objects",
"Dump __jit_debug_descriptor in-memory debug "
"objects as tool output")),
cl::Hidden);
ExitOnError ExitOnErr;
@@ -756,9 +751,41 @@ int main(int argc, char **argv, char * const *envp) {
return Result;
}
static std::function<void(Module &)> createDebugDumper() {
// JITLink debug support plugins put information about JITed code in this GDB
// JIT Interface global from OrcTargetProcess.
extern "C" struct jit_descriptor __jit_debug_descriptor;
static struct jit_code_entry *
findNextDebugDescriptorEntry(struct jit_code_entry *Latest) {
if (Latest == nullptr)
return __jit_debug_descriptor.first_entry;
if (Latest->next_entry)
return Latest->next_entry;
return nullptr;
}
static ToolOutputFile &claimToolOutput() {
static std::unique_ptr<ToolOutputFile> ToolOutput = nullptr;
if (ToolOutput) {
WithColor::error(errs(), "lli")
<< "Can not claim stdout for tool output twice\n";
exit(1);
}
std::error_code EC;
ToolOutput = std::make_unique<ToolOutputFile>("-", EC, sys::fs::OF_None);
if (EC) {
WithColor::error(errs(), "lli")
<< "Failed to create tool output file: " << EC.message() << "\n";
exit(1);
}
return *ToolOutput;
}
static std::function<void(Module &)> createIRDebugDumper() {
switch (OrcDumpKind) {
case DumpKind::NoDump:
case DumpKind::DumpDebugDescriptor:
case DumpKind::DumpDebugObjects:
return [](Module &M) {};
case DumpKind::DumpFuncsToStdOut:
@@ -800,6 +827,43 @@ static std::function<void(Module &)> createDebugDumper() {
llvm_unreachable("Unknown DumpKind");
}
static std::function<void(MemoryBuffer &)> createObjDebugDumper() {
switch (OrcDumpKind) {
case DumpKind::NoDump:
case DumpKind::DumpFuncsToStdOut:
case DumpKind::DumpModsToStdOut:
case DumpKind::DumpModsToDisk:
return [](MemoryBuffer &) {};
case DumpKind::DumpDebugDescriptor: {
// Dump the empty descriptor at startup once
fprintf(stderr, "jit_debug_descriptor 0x%016" PRIx64 "\n",
pointerToJITTargetAddress(__jit_debug_descriptor.first_entry));
return [](MemoryBuffer &) {
// Dump new entries as they appear
static struct jit_code_entry *Latest = nullptr;
while (auto *NewEntry = findNextDebugDescriptorEntry(Latest)) {
fprintf(stderr, "jit_debug_descriptor 0x%016" PRIx64 "\n",
pointerToJITTargetAddress(NewEntry));
Latest = NewEntry;
}
};
}
case DumpKind::DumpDebugObjects: {
return [](MemoryBuffer &Obj) {
static struct jit_code_entry *Latest = nullptr;
static ToolOutputFile &ToolOutput = claimToolOutput();
while (auto *NewEntry = findNextDebugDescriptorEntry(Latest)) {
ToolOutput.os().write(NewEntry->symfile_addr, NewEntry->symfile_size);
Latest = NewEntry;
}
};
}
}
llvm_unreachable("Unknown DumpKind");
}
Error loadDylibs() {
for (const auto &Dylib : Dylibs) {
std::string ErrMsg;
@@ -1001,8 +1065,7 @@ int runOrcJIT(const char *ProgName) {
if (PerModuleLazy)
J->setPartitionFunction(orc::CompileOnDemandLayer::compileWholeModule);
auto Dump = createDebugDumper();
auto IRDump = createIRDebugDumper();
J->getIRTransformLayer().setTransform(
[&](orc::ThreadSafeModule TSM,
const orc::MaterializationResponsibility &R) {
@@ -1011,18 +1074,18 @@ int runOrcJIT(const char *ProgName) {
dbgs() << "Bad module: " << &M << "\n";
exit(1);
}
Dump(M);
IRDump(M);
});
return TSM;
});
if (GenerateBuiltinFunctions.size() > 0) {
// Add LLI builtins.
orc::MangleAndInterner Mangle(J->getExecutionSession(), J->getDataLayout());
J->getMainJITDylib().addGenerator(
std::make_unique<LLIBuiltinFunctionGenerator>(GenerateBuiltinFunctions,
Mangle));
}
auto ObjDump = createObjDebugDumper();
J->getObjTransformLayer().setTransform(
[&](std::unique_ptr<MemoryBuffer> Obj)
-> Expected<std::unique_ptr<MemoryBuffer>> {
ObjDump(*Obj);
return Obj;
});
// If this is a Mingw or Cygwin executor then we need to alias __main to
// orc_rt_int_void_return_0.