Generator based template for reproducing issues.

Author: mcourteaux

test/failing_with_issue/generator_based_template/Makefile

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+# Makefile inspired by the structure of the apps/
+
+HALIDE_DISTRIB_PATH ?= ../../../distrib
+include ../../../apps/support/Makefile.inc
+
+.PHONY: build clean test codegen
+build: $(BIN)/$(HL_TARGET)/generated_pipeline.stmt
+
+
+$(GENERATOR_BIN)/generator: generator.cpp $(GENERATOR_DEPS)
+	@mkdir -p $(@D)
+	$(CXX) $(CXXFLAGS) $(filter %.cpp,$^) -o $@ $(LIBHALIDE_LDFLAGS)
+
+$(BIN)/%/generated_pipeline.stmt: $(GENERATOR_BIN)/generator
+	@mkdir -p $(@D)
+	$^ -g test_generator -e stmt,stmt_html,conceptual_stmt,conceptual_stmt_html,device_code,assembly,bitcode,static_library,c_header -o $(@D) -f generated_pipeline target=$*
+
+$(BIN)/%/test: $(BIN)/%/generated_pipeline.a test.cpp
+	@mkdir -p $(@D)
+	$(CXX) $(CXXFLAGS) -Wall -O2 -I$(BIN)/$* test.cpp $(BIN)/$*/generated_pipeline.a -o $@ $(LDFLAGS)
+
+test: $(BIN)/$(HL_TARGET)/test
+	$<
+
+clean:
+	rm -rf $(BIN)

test/failing_with_issue/generator_based_template/README.md

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+# Generator template for making issues.
+
+## Making the generator and emitting the code.
+
+This folder contains an app-like structure, but is meant
+for making reproducible codegen issues.
+By default the generator will emit `stmt`, `stmt_html`, `conceptual_stmt`,
+`conceptual_stmt_html`, `device_code`, `assembly`, `bitcode`.
+
+To use this template, you ...
+ 1. Duplicate this folder and rename it (reference the issue number in the
+    folder name if you have one).
+ 2. Edit the `generator.cpp` file to produce the issue you wish to
+    demonstrate.
+ 3. Run `make HL_TARGET=...`, with your target triple (e.g.,
+    `HL_TARGET=host-cuda`).
+ 4. Open an issue and paste the generator code.
+
+As such, the everyone with the Halide repository checked out, can copy-paste
+your generator code and reproduce the issue with relative ease.
+
+## Running the code.
+
+If you additionally wish to run the code as part of the issue, there is a starter
+main-file provided `test.cpp`. There is an additional rule in the Makefile, which you can
+run with:
+
+```sh
+make HL_TARGET=... test
+```
+
+If this is part of the problem demonstration, include this code in the issue.

test/failing_with_issue/generator_based_template/generator.cpp

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+#include <Halide.h>
+using namespace Halide;
+
+class TestGenerator : public Generator<TestGenerator> {
+public:
+    // Define Input/Outputs.
+    Output<float> output{"output"};
+
+    void generate() {
+        output() = 0.0f;
+        // Fill in.
+    }
+
+    void schedule() {
+        // Fill in.
+    }
+};
+
+HALIDE_REGISTER_GENERATOR(TestGenerator, test_generator)

test/failing_with_issue/generator_based_template/test.cpp

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+#include "generated_pipeline.h"
+#include <HalideBuffer.h>
+#include <cstdio>
+
+int main(int argc, char **argv) {
+    Halide::Runtime::Buffer<float, 0> output = Halide::Runtime::Buffer<float>::make_scalar();
+    generated_pipeline(output);
+    std::printf("Output: %f\n", output());
+
+    return 0;
+}