all: build/test using Go 1.27-rc3

Signed-off-by: deadprogram <ron@hybridgroup.com>

.github/workflows/build-macos.yml

@@ -40,7 +40,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.27.0-rc.3'
           cache: true
       - name: Restore LLVM source cache
         uses: actions/cache/restore@v5
@@ -131,7 +131,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.27.0-rc.3'
           cache: true
       - name: Build TinyGo (LLVM ${{ matrix.version }})
         run: go install -tags=llvm${{ matrix.version }}

.github/workflows/linux.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.27.0-rc.3'
           cache: true
       - name: Run go mod tidy
         run: go mod tidy
@@ -36,7 +36,7 @@ jobs:
     # statically linked binary.
     runs-on: ubuntu-latest
     container:
-      image: golang:1.27rc2-alpine
+      image: golang:1.27rc3-alpine
     outputs:
       version: ${{ steps.version.outputs.version }}
     steps:
@@ -160,7 +160,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.27.0-rc.3'
           cache: true
       - name: Install wasmtime
         uses: bytecodealliance/actions/wasmtime/setup@v1
@@ -204,7 +204,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.27.0-rc.3'
           cache: true
       - name: Install Node.js
         uses: actions/setup-node@v6
@@ -323,7 +323,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.27.0-rc.3'
           cache: true
       - name: Restore LLVM source cache
         uses: actions/cache/restore@v5

.github/workflows/windows.yml

@@ -34,7 +34,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.27.0-rc.3'
           cache: true
       - name: Restore cached LLVM source
         uses: actions/cache/restore@v5
@@ -129,7 +129,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.27.0-rc.3'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v8
@@ -150,7 +150,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.27.0-rc.3'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v8
@@ -176,7 +176,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.27.0-rc.3'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v8

Dockerfile

@@ -1,5 +1,5 @@
 # tinygo-llvm stage obtains the llvm source for TinyGo
-FROM golang:1.27rc2 AS tinygo-llvm
+FROM golang:1.27rc3 AS tinygo-llvm
 
 RUN apt-get update && \
     apt-get install -y apt-utils make cmake clang-17 ninja-build && \
@@ -33,7 +33,7 @@ RUN cd /tinygo/ && \
 
 # tinygo-compiler copies the compiler build over to a base Go container (without
 # all the build tools etc).
-FROM golang:1.27rc2 AS tinygo-compiler
+FROM golang:1.27rc3 AS tinygo-compiler
 
 # Copy tinygo build.
 COPY --from=tinygo-compiler-build /tinygo/build/release/tinygo /tinygo

main.go

@@ -177,8 +177,15 @@ func Build(pkgName, outpath string, config *compileopts.Config) error {
 				// Pick a default output path based on the main directory.
 				outpath = filepath.Base(result.MainDir) + config.DefaultBinaryExtension()
 			}
+		} else if fi, statErr := os.Stat(outpath); statErr == nil && fi.IsDir() {
+			var name string
+			if strings.HasSuffix(pkgName, ".go") {
+				name = filepath.Base(pkgName[:len(pkgName)-3]) + config.DefaultBinaryExtension()
+			} else {
+				name = filepath.Base(result.MainDir) + config.DefaultBinaryExtension()
+			}
+			outpath = filepath.Join(outpath, name)
 		}
-
 		if err := os.Rename(result.Binary, outpath); err != nil {
 			// Moving failed. Do a file copy.
 			inf, err := os.Open(result.Binary)

src/runtime/gc_blocks.go

@@ -510,7 +510,7 @@ func realloc(ptr unsafe.Pointer, size uintptr) unsafe.Pointer {
 	lastBlock := firstBlock.findHead()
 
 	// Calculate the size of the original allocation body.
-	oldSize := uintptr(lastBlock-firstBlock)*blocksPerStateByte + (bytesPerBlock - unsafe.Sizeof(objHeader{}))
+	oldSize := uintptr(lastBlock-firstBlock)*bytesPerBlock + (bytesPerBlock - unsafe.Sizeof(objHeader{}))
 
 	if size <= oldSize {
 		// The requested size is less than the old size.

src/runtime/gc_leaking.go

@@ -47,8 +47,14 @@ func alloc(size uintptr, layout unsafe.Pointer) unsafe.Pointer {
 	gcTotalAlloc += uint64(size)
 	gcMallocs++
 	heapptr += size
-	for heapptr >= heapEnd {
+	if heapptr < addr {
+		// The allocation size overflowed the heap pointer.
+		runtimePanic("out of memory")
+	}
+	for heapptr > heapEnd {
 		// Try to increase the heap and check again.
+		// Use > instead of >= because an allocation that exactly
+		// ends at heapEnd is still within heap boundaries.
 		if growHeap() {
 			continue
 		}

src/runtime/gc_stack_cores.go

@@ -43,6 +43,12 @@ func gcMarkReachable() {
 		gcPauseCore(i)
 	}
 
+	// Busy-wait until all the other cores are ready.
+	for gcScanState.Load() != numCPU {
+		spinLoopWait()
+	}
+	gcScanState.Store(0)
+
 	// Scan the stack(s) of the current core.
 	scanCurrentStack()
 	if !task.OnSystemStack() {
@@ -53,13 +59,6 @@ func gcMarkReachable() {
 	// Scan globals.
 	findGlobals(markRoots)
 
-	// Busy-wait until all the other cores are ready. They certainly should be,
-	// after the scanning we did above.
-	for gcScanState.Load() != numCPU {
-		spinLoopWait()
-	}
-	gcScanState.Store(0)
-
 	// Signal each core in turn that they can scan the stack.
 	for i := uint32(0); i < numCPU; i++ {
 		if i == core {

src/runtime/hashmap.go

@@ -807,13 +807,13 @@ func hashmapInterfaceHash(itf interface{}, seed uintptr) uint32 {
 	case reflectlite.Array:
 		var hash uint32
 		for i := 0; i < x.Len(); i++ {
-			hash ^= hashmapInterfaceHash(valueInterfaceUnsafe(x.Index(i)), seed)
+			hash = (hash * 31) ^ hashmapInterfaceHash(valueInterfaceUnsafe(x.Index(i)), seed)
 		}
 		return hash
 	case reflectlite.Struct:
 		var hash uint32
 		for i := 0; i < x.NumField(); i++ {
-			hash ^= hashmapInterfaceHash(valueInterfaceUnsafe(x.Field(i)), seed)
+			hash = (hash * 31) ^ hashmapInterfaceHash(valueInterfaceUnsafe(x.Field(i)), seed)
 		}
 		return hash
 	default: