add -nobounds (similar to -gcflags=-B)

Author: dgryski

builder/build.go

@@ -214,6 +214,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		MaxStackAlloc:      config.MaxStackAlloc(),
 		NeedsStackObjects:  config.NeedsStackObjects(),
 		Debug:              !config.Options.SkipDWARF, // emit DWARF except when -internal-nodwarf is passed
+		Nobounds:           config.Options.Nobounds,
 		PanicStrategy:      config.PanicStrategy(),
 	}
 

compileopts/options.go

@@ -43,6 +43,7 @@ type Options struct {
 	PrintCommands   func(cmd string, args ...string) `json:"-"`
 	Semaphore       chan struct{}                    `json:"-"` // -p flag controls cap
 	Debug           bool
+	Nobounds        bool
 	PrintSizes      string
 	PrintAllocs     *regexp.Regexp // regexp string
 	PrintStacks     bool

compiler/compiler.go

@@ -58,6 +58,7 @@ type Config struct {
 	MaxStackAlloc      uint64
 	NeedsStackObjects  bool
 	Debug              bool // Whether to emit debug information in the LLVM module.
+	Nobounds           bool // Whether to skip bounds checks
 	PanicStrategy      string
 }
 

compiler/symbol.go

@@ -438,6 +438,10 @@ func (c *compilerContext) parsePragmas(info *functionInfo, f *ssa.Function) {
 			}
 		}
 	}
+
+	if c.Nobounds {
+		info.nobounds = true
+	}
 }
 
 // Check whether this function can be used in //go:wasmimport or

main.go

@@ -1514,6 +1514,7 @@ func main() {
 	printCommands := flag.Bool("x", false, "Print commands")
 	parallelism := flag.Int("p", runtime.GOMAXPROCS(0), "the number of build jobs that can run in parallel")
 	nodebug := flag.Bool("no-debug", false, "strip debug information")
+	nobounds := flag.Bool("nobounds", false, "do not emit bounds checks")
 	ocdCommandsString := flag.String("ocd-commands", "", "OpenOCD commands, overriding target spec (can specify multiple separated by commas)")
 	ocdOutput := flag.Bool("ocd-output", false, "print OCD daemon output during debug")
 	port := flag.String("port", "", "flash port (can specify multiple candidates separated by commas)")
@@ -1625,6 +1626,7 @@ func main() {
 		SkipDWARF:       *skipDwarf,
 		Semaphore:       make(chan struct{}, *parallelism),
 		Debug:           !*nodebug,
+		Nobounds:        *nobounds,
 		PrintSizes:      *printSize,
 		PrintStacks:     *printStacks,
 		PrintAllocs:     printAllocs,