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[flang] Generate main only when a Fortran program statement is present (
#89938) This patch changes the behaviour for flang to only create and link to a `main` entry point when the Fortran code has a program statement in it. This means that flang-new can be used to link even when the program is a mixed C/Fortran code with `main` present in C and no entry point present in Fortran. This also removes the `-fno-fortran-main` flag as this no longer has any functionality.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| //===-- Main.h - generate main runtime API calls ----------------*- 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 | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #ifndef FORTRAN_OPTIMIZER_BUILDER_RUNTIME_MAIN_H | ||
| #define FORTRAN_OPTIMIZER_BUILDER_RUNTIME_MAIN_H | ||
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| namespace mlir { | ||
| class Location; | ||
| } // namespace mlir | ||
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| namespace fir { | ||
| class FirOpBuilder; | ||
| class GlobalOp; | ||
| } // namespace fir | ||
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| namespace fir::runtime { | ||
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| void genMain(fir::FirOpBuilder &builder, mlir::Location loc, | ||
| fir::GlobalOp &env); | ||
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| } | ||
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| #endif // FORTRAN_OPTIMIZER_BUILDER_RUNTIME_MAIN_H |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| //===-- Main.cpp - generate main runtime API calls --------------*- 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 | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #include "flang/Optimizer/Builder/Runtime/Main.h" | ||
| #include "flang/Optimizer/Builder/BoxValue.h" | ||
| #include "flang/Optimizer/Builder/FIRBuilder.h" | ||
| #include "flang/Optimizer/Builder/Runtime/RTBuilder.h" | ||
| #include "flang/Optimizer/Dialect/FIROps.h" | ||
| #include "flang/Optimizer/Dialect/FIRType.h" | ||
| #include "flang/Runtime/main.h" | ||
| #include "flang/Runtime/stop.h" | ||
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| using namespace Fortran::runtime; | ||
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| /// Create a `int main(...)` that calls the Fortran entry point | ||
| void fir::runtime::genMain(fir::FirOpBuilder &builder, mlir::Location loc, | ||
| fir::GlobalOp &env) { | ||
| auto *context = builder.getContext(); | ||
| auto argcTy = builder.getDefaultIntegerType(); | ||
| auto ptrTy = mlir::LLVM::LLVMPointerType::get(context); | ||
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| // void ProgramStart(int argc, char** argv, char** envp, | ||
| // _QQEnvironmentDefaults* env) | ||
| auto startFn = builder.createFunction( | ||
| loc, RTNAME_STRING(ProgramStart), | ||
| mlir::FunctionType::get(context, {argcTy, ptrTy, ptrTy, ptrTy}, {})); | ||
| // void ProgramStop() | ||
| auto stopFn = | ||
| builder.createFunction(loc, RTNAME_STRING(ProgramEndStatement), | ||
| mlir::FunctionType::get(context, {}, {})); | ||
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| // int main(int argc, char** argv, char** envp) | ||
| auto mainFn = builder.createFunction( | ||
| loc, "main", | ||
| mlir::FunctionType::get(context, {argcTy, ptrTy, ptrTy}, argcTy)); | ||
| // void _QQmain() | ||
| auto qqMainFn = builder.createFunction( | ||
| loc, "_QQmain", mlir::FunctionType::get(context, {}, {})); | ||
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| mainFn.setPublic(); | ||
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| auto *block = mainFn.addEntryBlock(); | ||
| mlir::OpBuilder::InsertionGuard insertGuard(builder); | ||
| builder.setInsertionPointToStart(block); | ||
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| llvm::SmallVector<mlir::Value, 4> args(block->getArguments()); | ||
| auto envAddr = | ||
| builder.create<fir::AddrOfOp>(loc, env.getType(), env.getSymbol()); | ||
| args.push_back(envAddr); | ||
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| builder.create<fir::CallOp>(loc, startFn, args); | ||
| builder.create<fir::CallOp>(loc, qqMainFn); | ||
| builder.create<fir::CallOp>(loc, stopFn); | ||
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| mlir::Value ret = builder.createIntegerConstant(loc, argcTy, 0); | ||
| builder.create<mlir::func::ReturnOp>(loc, ret); | ||
| } |
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