- Add z_rt_default.go with signal handler for SIGSEGV on non-wasm platforms
- Convert segmentation faults from nil pointer access to Go panic
- Enable recover() to catch nil pointer dereference errors
- Use build tag (!wasm) to maintain wasm platform compatibility
- Remove commented-out signal handling code from z_rt.go
This aligns llgo's behavior with standard Go, where accessing nil pointer
fields triggers a recoverable panic instead of immediate program crash.
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Co-Authored-By: Claude <noreply@anthropic.com>
Implements reflect.Indirect function to support pointer dereferencing.
This function returns the value that a pointer points to, or returns
the value unchanged if it's not a pointer.
Fixes#1354
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The CompareString in the llgo:skip directive is redundant because
the overlay mechanism automatically handles symbol skipping when
an overlay package defines a symbol.
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Use go:linkname to access build.Default and modify Compiler in init function.
This is much simpler than patching defaultContext() and all its dependencies.
- Reduced from 137 lines to 27 lines
- Removed zcgo.go (no longer needed)
- Removed complex parseGoVersion, defaultContext, and helper functions
- Now just sets build.Default.Compiler = "gc" in init()
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- Created zcgo.go with defaultCGO_ENABLED constant (Go 1.24 pattern)
- Updated parseGoVersion to panic on unexpected input instead of fallback
- Added runtime.(*Func).Name stub to symtab.go for Go 1.21/1.22 compatibility
- Removed go1.23 build constraint from demo
- Removed internal/buildcfg package (replaced by zcgo.go)
These changes ensure the demo works across Go 1.21+ versions.
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- Created internal/buildcfg package with DefaultCGO_ENABLED constant
- Updated CGO_ENABLED handling to use buildcfg.DefaultCGO_ENABLED
- Added original Go stdlib comment for release tags
- Simplified toolTags usage by using it directly instead of wrapper function
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- Link internal/buildcfg.ToolTags variable instead of hardcoding tool tags
- Add comprehensive test cases in demo.go to verify:
- build.Default.Compiler is correctly patched to "gc"
- ToolTags are properly populated from internal/buildcfg
- ReleaseTags are correctly generated
- Validates the go/build patches work as expected
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- Remove /llgo from .gitignore (unnecessary)
- Move cgoSupported linkname to top with other linknames
- Fix goVersion initialization timing by making it local variable
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Add linkname directives and stdlib comments for defaultToolTags and
defaultReleaseTags variables to match Go standard library pattern. This
allows external packages (like gopherjs) to access these internal variables
via linkname, maintaining compatibility with packages that depend on this
behavior.
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Instead of creating a custom platform package, use the go:linkname
directive to directly link to Go's standard library internal/platform.CgoSupported
function. This approach:
- Eliminates the need to maintain a copy of platform support data
- Uses Go's canonical platform information directly
- Reduces code duplication and maintenance burden
- Follows Go's linkname pattern for accessing internal packages
Changes:
- Added import _ "unsafe" to enable linkname
- Added //go:linkname directive for cgoSupported function
- Removed custom runtime/internal/lib/internal/platform package
- Updated function call from platform.CgoSupported to cgoSupported
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Updated runtime/internal/lib/internal/platform/platform.go to match
the original Go internal/platform package structure:
- Added OSArch struct with GOOS and GOARCH fields
- Added osArchInfo struct with CgoSupported, FirstClass, and Broken fields
- Created distInfo map using OSArch as keys
- Updated CgoSupported function to use map lookup (matches original implementation)
This change makes the package structure more consistent with Go's
standard library and follows the established pattern more closely.
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Created runtime/internal/lib/internal/platform package to house the
CgoSupported function, following the established pattern used by other
internal packages like internal/itoa.
Changes:
- Created runtime/internal/lib/internal/platform/platform.go
- Moved cgoSupported function to platform.CgoSupported
- Updated runtime/internal/lib/go/build/build.go to import and use
the new package
This refactoring improves code organization by separating
platform-specific utilities into their own package, making the code
more maintainable and reusable.
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Replaced hardcoded goVersion constant with parseGoVersion() function
that dynamically extracts the Go version from runtime.Version().
This eliminates the need to update the version manually.
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Learned from other AltPkg implementations to create a truly minimal patch:
- Moved from 2073-line overlay to 127-line hasAltPkg implementation
- Replaced internal package dependencies:
* internal/buildcfg → runtime.GOARCH/GOOS
* internal/goversion → hardcoded constant (24)
* internal/platform.CgoSupported → simplified implementation
* internal/buildcfg.ToolTags → simplified buildToolTags()
- Used type alias (Context = build.Context) to reference stdlib types
- Added go/build to hasAltPkg map
- Removed overlay entirely
This follows the pattern used by other AltPkg packages and achieves
the minimal patching approach requested.
Demo verified working with llgo.
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After investigating the hasAltPkg mechanism, determined that it's not
suitable for go/build.defaultContext() because:
1. hasAltPkg works well for providing additional/alternative functions
2. But defaultContext() needs to REPLACE an existing function that depends
on internal/buildcfg, internal/goversion, and internal/platform
3. These internal packages cannot be imported from runtime/internal/lib
The full overlay approach (2073 lines) works correctly. Seeking guidance
on whether this is acceptable or if there's an alternative approach.
Demo verified working:
- runtime.Compiler = "llgo"
- go/build.Import() works correctly
- No "unknown compiler" error
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Reduced the go/build overlay from 2073 lines to just 87 lines by only
including the patched defaultContext() function and its direct dependencies
(envOr, defaultGOPATH, and related variables).
The overlay system works by merging with the standard library, so we only
need to provide the functions we're modifying. Unpatched functions
automatically fall back to the Go standard library implementation.
This makes the patch much more maintainable and clearly shows what's
being modified: just the Compiler field assignment in defaultContext().
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- Moved full overlay file from runtime/_overlay/go/build/build.go to
runtime/internal/go/build/build.go to make it clearer what's being overridden
- Updated runtime/overlay.go to embed from new location
- Created demo under _demo/go/gobuild to demonstrate go/build package working with llgo
- The overlay still contains the full file but is now organized under runtime/internal
following the project's pattern for patched standard library packages
Fixes#1346
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- Add tests for all major hash/maphash public APIs:
* Hash basics (WriteString, Sum64, Reset)
* MakeSeed and SetSeed functionality
* Write methods (Write, WriteByte, WriteString)
* Bytes and String convenience functions
- Use panic() for unexpected errors instead of silent failures
- Add proper error checking and validation
- Document Comparable/WriteComparable limitations in overlay
Note: Comparable() and WriteComparable() are not yet supported and will
panic with 'intrinsic' error as they require runtime intrinsic support.
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Implement randUint64() directly in the maphash overlay to ensure compatibility
across Go versions. Go 1.21's randUint64() calls runtime.fastrand64, while
Go 1.22+ calls runtime.rand. The wrapper function bridges to llgo's fastrand64
implementation, avoiding undefined symbol errors on Go 1.21.
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The llgo:skipall directive was preventing fallback to the standard library,
causing undefined symbol errors for functions like WriteString, MakeSeed, etc.
The overlay now only defines the two linkname functions, allowing typepatch
to handle the rest.
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Move runtime_rand and runtime_memhash linkname declarations from
runtime/internal/lib/runtime/runtime.go to runtime/internal/lib/hash/maphash/maphash.go
to avoid polluting the runtime package namespace.
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- Register hash/maphash in hasAltPkg map in runtime/build.go
- Add rand() function that bridges to fastrand64() in runtime overlay
- Add memhash() function that bridges to internal memhash() in runtime overlay
- Fixes issue where hash/maphash package failed with undefined symbols
Fixes#1338
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Co-authored-by: xgopilot <noreply@goplus.org>
