Merge pull request #1384 from luoliwoshang/feature/export-different-names-1378

cl: support //export with different symbol names on embedded targets

_demo/embed/export/main.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	"github.com/goplus/lib/c"
+)
+
+// This demo shows how to use //export with different symbol names on embedded targets.
+//
+// On embedded targets, you can export Go functions with different C symbol names.
+// This is useful for hardware interrupt handlers that require specific names.
+
+// Standard Go export - same name
+//
+//export HelloWorld
+func HelloWorld() {
+	c.Printf(c.Str("Hello from "))
+	c.Printf(c.Str("HelloWorld\n"))
+}
+
+// Embedded target export - different name
+// Go function name: interruptLPSPI2
+// Exported C symbol: LPSPI2_IRQHandler
+//
+//export LPSPI2_IRQHandler
+func interruptLPSPI2() {
+	c.Printf(c.Str("LPSPI2 interrupt "))
+	c.Printf(c.Str("handler called\n"))
+}
+
+// Embedded target export - different name
+// Go function name: systemTickHandler
+// Exported C symbol: SysTick_Handler
+//
+//export SysTick_Handler
+func systemTickHandler() {
+	c.Printf(c.Str("SysTick "))
+	c.Printf(c.Str("handler called\n"))
+}
+
+// Embedded target export - different name
+// Go function name: Add
+// Exported C symbol: AddFunc
+//
+//export AddFunc
+func Add(a, b int) int {
+	result := a + b
+	c.Printf(c.Str("AddFunc(%d, %d) = %d\n"), a, b, result)
+	return result
+}
+
+func main() {
+	c.Printf(c.Str("=== Export Demo ===\n\n"))
+
+	// Call exported functions directly from Go
+	c.Printf(c.Str("Calling HelloWorld:\n"))
+	HelloWorld()
+
+	c.Printf(c.Str("\nSimulating hardware interrupts:\n"))
+	interruptLPSPI2()
+	systemTickHandler()
+
+	c.Printf(c.Str("\nTesting function with return value:\n"))
+	result := Add(10, 20)
+	c.Printf(c.Str("Result: %d\n"), result)
+
+	c.Printf(c.Str("\n=== Demo Complete ===\n"))
+}

_demo/embed/export/verify_export.sh

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+#!/bin/bash
+
+set -e
+
+echo "Building for embedded target..."
+
+# Build for embedded target as executable
+# Use llgo directly instead of llgo.sh to avoid go.mod version check
+llgo build -o test-verify --target=esp32 .
+
+echo "Checking exported symbols..."
+
+# Get exported symbols
+exported_symbols=$(nm -gU ./test-verify.elf | grep -E "(HelloWorld|LPSPI2_IRQHandler|SysTick_Handler|AddFunc)" | awk '{print $NF}')
+
+echo ""
+echo "Exported symbols:"
+echo "$exported_symbols" | awk '{print "  " $0}'
+echo ""
+
+# Check expected symbols
+expected=("HelloWorld" "LPSPI2_IRQHandler" "SysTick_Handler" "AddFunc")
+missing=""
+
+for symbol in "${expected[@]}"; do
+    if ! echo "$exported_symbols" | grep -q "^$symbol$"; then
+        missing="$missing $symbol"
+    fi
+done
+
+if [ -n "$missing" ]; then
+    echo "❌ Missing symbols:$missing"
+    exit 1
+fi
+
+echo "✅ Symbol name mapping verification:"
+echo "  HelloWorld           -> HelloWorld"
+echo "  interruptLPSPI2      -> LPSPI2_IRQHandler"
+echo "  systemTickHandler    -> SysTick_Handler"
+echo "  Add                  -> AddFunc"
+echo ""
+echo "🎉 All export symbols verified successfully!"
+echo ""
+
+echo "Testing that non-embedded target rejects different export names..."
+# Build without --target should fail with panic
+if llgo build -o test-notarget . 2>&1 | grep -q 'export comment has wrong name "LPSPI2_IRQHandler"'; then
+    echo "✅ Correctly rejected different export name on non-embedded target"
+else
+    echo "❌ Should have panicked with 'export comment has wrong name' error"
+    exit 1
+fi
+echo ""
+echo "Note: Different symbol names are only supported on embedded targets."