// // OCCAM // // Copyright (c) 2017, SRI International // // All rights reserved. // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are met: // // * Redistributions of source code must retain the above copyright notice, this // list of conditions and the following disclaimer. // // * Redistributions in binary form must reproduce the above copyright notice, // this list of conditions and the following disclaimer in the documentation // and/or other materials provided with the distribution. // // * Neither the name of SRI International nor the names of its contributors may // be used to endorse or promote products derived from this software without // specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // package shared import ( "crypto/sha256" "encoding/hex" "fmt" "path" "path/filepath" "regexp" "runtime" "strings" ) //ParserResult is the result of parsing and partioning the command line arguments. type ParserResult struct { InputList []string InputFiles []string ObjectFiles []string OutputFilename string CompileArgs []string LinkArgs []string ForbiddenFlags []string IsVerbose bool IsDependencyOnly bool IsPreprocessOnly bool IsAssembleOnly bool IsAssembly bool IsCompileOnly bool IsEmitLLVM bool IsLTO bool IsPrintOnly bool } const parserResultFormat = ` InputList: %v InputFiles: %v ObjectFiles: %v OutputFilename: %v CompileArgs: %v LinkArgs: %v ForbiddenFlags: %v IsVerbose: %v IsDependencyOnly: %v IsPreprocessOnly: %v IsAssembleOnly: %v IsAssembly: %v IsCompileOnly: %v IsEmitLLVM: %v IsLTO: %v IsPrintOnly: %v ` func (pr *ParserResult) String() string { return fmt.Sprintf(parserResultFormat, pr.InputList, pr.InputFiles, pr.ObjectFiles, pr.OutputFilename, pr.CompileArgs, pr.LinkArgs, pr.ForbiddenFlags, pr.IsVerbose, pr.IsDependencyOnly, pr.IsPreprocessOnly, pr.IsAssembleOnly, pr.IsAssembly, pr.IsCompileOnly, pr.IsEmitLLVM, pr.IsLTO, pr.IsPrintOnly) } type flagInfo struct { arity int handler func(string, []string) } type argPattern struct { pattern string finfo flagInfo } //SkipBitcodeGeneration indicates whether or not we should generate bitcode for these command line options. func (pr *ParserResult) SkipBitcodeGeneration() bool { reason := "No particular reason" retval := false squark := LogDebug if LLVMConfigureOnly != "" { reason = "we are in configure only mode" retval = true } else if len(pr.InputFiles) == 0 { reason = "we did not see any input files" retval = true } else if pr.IsEmitLLVM { squark = LogWarning reason = "we are in emit-llvm mode, and so the compiler is doing the job for us" retval = true } else if pr.IsLTO { squark = LogWarning reason = "we are doing link time optimization, and so the compiler is doing the job for us" retval = true } else if pr.IsAssembly { reason = "the input file(s) are written in assembly" squark = LogWarning retval = true } else if pr.IsAssembleOnly { reason = "we are assembling only, and so have nowhere to embed the path of the bitcode" retval = true } else if pr.IsDependencyOnly && !pr.IsCompileOnly { reason = "we are only computing dependencies at this stage" retval = true } else if pr.IsPreprocessOnly { reason = "we are in preprocess only mode" retval = true } else if pr.IsPrintOnly { reason = "we are in print only mode, and so have nowhere to embed the path of the bitcode" retval = true } if retval { squark(" We are skipping bitcode generation because %v.\n", reason) } return retval } //Parse analyzes the command line aruguments and returns the result of that analysis. func Parse(argList []string) ParserResult { var pr = ParserResult{} pr.InputList = argList var argsExactMatches = map[string]flagInfo{ "/dev/null": {0, pr.inputFileCallback}, //iam: linux kernel "-": {0, pr.printOnlyCallback}, "-o": {1, pr.outputFileCallback}, "-c": {0, pr.compileOnlyCallback}, "-E": {0, pr.preprocessOnlyCallback}, "-S": {0, pr.assembleOnlyCallback}, "--verbose": {0, pr.verboseFlagCallback}, "--param": {1, pr.defaultBinaryCallback}, "-aux-info": {1, pr.defaultBinaryCallback}, "--version": {0, pr.compileOnlyCallback}, "-v": {0, pr.compileOnlyCallback}, "-w": {0, pr.compileUnaryCallback}, "-W": {0, pr.compileUnaryCallback}, "-emit-llvm": {0, pr.emitLLVMCallback}, "-flto": {0, pr.linkTimeOptimizationCallback}, "-pipe": {0, pr.compileUnaryCallback}, "-undef": {0, pr.compileUnaryCallback}, "-nostdinc": {0, pr.compileUnaryCallback}, "-nostdinc++": {0, pr.compileUnaryCallback}, "-Qunused-arguments": {0, pr.compileUnaryCallback}, "-no-integrated-as": {0, pr.compileUnaryCallback}, "-integrated-as": {0, pr.compileUnaryCallback}, "-no-canonical-prefixes": {0, pr.compileLinkUnaryCallback}, "--sysroot": {1, pr.compileLinkBinaryCallback}, //iam: musl stuff // "-no-cpp-precomp": {0, pr.compileUnaryCallback}, // "-pthread": {0, pr.linkUnaryCallback}, "-nostdlibinc": {0, pr.compileUnaryCallback}, "-mno-omit-leaf-frame-pointer": {0, pr.compileUnaryCallback}, "-maes": {0, pr.compileUnaryCallback}, "-mno-aes": {0, pr.compileUnaryCallback}, "-mavx": {0, pr.compileUnaryCallback}, "-mno-avx": {0, pr.compileUnaryCallback}, "-mavx2": {0, pr.compileUnaryCallback}, "-mno-avx2": {0, pr.compileUnaryCallback}, "-mno-red-zone": {0, pr.compileUnaryCallback}, "-mmmx": {0, pr.compileUnaryCallback}, "-mbmi": {0, pr.compileUnaryCallback}, "-mbmi2": {0, pr.compileUnaryCallback}, "-mf161c": {0, pr.compileUnaryCallback}, "-mfma": {0, pr.compileUnaryCallback}, "-mno-mmx": {0, pr.compileUnaryCallback}, "-mno-global-merge": {0, pr.compileUnaryCallback}, //iam: linux kernel stuff "-mno-80387": {0, pr.compileUnaryCallback}, //iam: linux kernel stuff "-msse": {0, pr.compileUnaryCallback}, "-mno-sse": {0, pr.compileUnaryCallback}, "-msse2": {0, pr.compileUnaryCallback}, "-mno-sse2": {0, pr.compileUnaryCallback}, "-msse3": {0, pr.compileUnaryCallback}, "-mno-sse3": {0, pr.compileUnaryCallback}, "-mssse3": {0, pr.compileUnaryCallback}, "-mno-ssse3": {0, pr.compileUnaryCallback}, "-msse4": {0, pr.compileUnaryCallback}, "-mno-sse4": {0, pr.compileUnaryCallback}, "-msse4.1": {0, pr.compileUnaryCallback}, "-mno-sse4.1": {0, pr.compileUnaryCallback}, "-msse4.2": {0, pr.compileUnaryCallback}, "-mno-sse4.2": {0, pr.compileUnaryCallback}, "-msoft-float": {0, pr.compileUnaryCallback}, "-m3dnow": {0, pr.compileUnaryCallback}, "-mno-3dnow": {0, pr.compileUnaryCallback}, "-m16": {0, pr.compileLinkUnaryCallback}, //iam: linux kernel stuff "-m32": {0, pr.compileLinkUnaryCallback}, "-m64": {0, pr.compileLinkUnaryCallback}, "-mstackrealign": {0, pr.compileUnaryCallback}, "-mretpoline-external-thunk": {0, pr.compileUnaryCallback}, //iam: linux kernel stuff "-mno-fp-ret-in-387": {0, pr.compileUnaryCallback}, //iam: linux kernel stuff "-mskip-rax-setup": {0, pr.compileUnaryCallback}, //iam: linux kernel stuff "-mindirect-branch-register": {0, pr.compileUnaryCallback}, //iam: linux kernel stuff "-mllvm": {1, pr.compileUnaryCallback}, //iam: chromium "-A": {1, pr.compileBinaryCallback}, "-D": {1, pr.compileBinaryCallback}, "-U": {1, pr.compileBinaryCallback}, "-arch": {1, pr.compileBinaryCallback}, //iam: openssl "-P": {1, pr.compileUnaryCallback}, //iam: linux kernel stuff (linker script stuff) "-C": {1, pr.compileUnaryCallback}, //iam: linux kernel stuff (linker script stuff) "-M": {0, pr.dependencyOnlyCallback}, "-MM": {0, pr.dependencyOnlyCallback}, "-MF": {1, pr.dependencyBinaryCallback}, "-MJ": {1, pr.dependencyBinaryCallback}, "-MG": {0, pr.dependencyOnlyCallback}, "-MP": {0, pr.dependencyOnlyCallback}, "-MT": {1, pr.dependencyBinaryCallback}, "-MQ": {1, pr.dependencyBinaryCallback}, "-MD": {0, pr.dependencyOnlyCallback}, "-MV": {0, pr.dependencyOnlyCallback}, "-MMD": {0, pr.dependencyOnlyCallback}, "-I": {1, pr.compileBinaryCallback}, "-idirafter": {1, pr.compileBinaryCallback}, "-include": {1, pr.compileBinaryCallback}, "-imacros": {1, pr.compileBinaryCallback}, "-iprefix": {1, pr.compileBinaryCallback}, "-iwithprefix": {1, pr.compileBinaryCallback}, "-iwithprefixbefore": {1, pr.compileBinaryCallback}, "-isystem": {1, pr.compileBinaryCallback}, "-isysroot": {1, pr.compileBinaryCallback}, "-iquote": {1, pr.compileBinaryCallback}, "-imultilib": {1, pr.compileBinaryCallback}, "-ansi": {0, pr.compileUnaryCallback}, "-pedantic": {0, pr.compileUnaryCallback}, "-x": {1, pr.compileBinaryCallback}, "-g": {0, pr.compileUnaryCallback}, "-g0": {0, pr.compileUnaryCallback}, "-g1": {0, pr.compileUnaryCallback}, "-g2": {0, pr.compileUnaryCallback}, "-g3": {0, pr.compileUnaryCallback}, "-ggdb": {0, pr.compileUnaryCallback}, "-ggdb0": {0, pr.compileUnaryCallback}, "-ggdb1": {0, pr.compileUnaryCallback}, "-ggdb2": {0, pr.compileUnaryCallback}, "-ggdb3": {0, pr.compileUnaryCallback}, "-gdwarf": {0, pr.compileUnaryCallback}, "-gdwarf-2": {0, pr.compileUnaryCallback}, "-gdwarf-3": {0, pr.compileUnaryCallback}, "-gdwarf-4": {0, pr.compileUnaryCallback}, "-gline-tables-only": {0, pr.compileUnaryCallback}, "-grecord-gcc-switches": {0, pr.compileUnaryCallback}, "-ggnu-pubnames": {0, pr.compileUnaryCallback}, "-p": {0, pr.compileUnaryCallback}, "-pg": {0, pr.compileUnaryCallback}, "-O": {0, pr.compileUnaryCallback}, "-O0": {0, pr.compileUnaryCallback}, "-O1": {0, pr.compileUnaryCallback}, "-O2": {0, pr.compileUnaryCallback}, "-O3": {0, pr.compileUnaryCallback}, "-Os": {0, pr.compileUnaryCallback}, "-Ofast": {0, pr.compileUnaryCallback}, "-Og": {0, pr.compileUnaryCallback}, "-Oz": {0, pr.compileUnaryCallback}, //iam: linux kernel "-Xclang": {1, pr.compileBinaryCallback}, "-Xpreprocessor": {1, pr.defaultBinaryCallback}, "-Xassembler": {1, pr.defaultBinaryCallback}, "-Xlinker": {1, pr.defaultBinaryCallback}, "-l": {1, pr.linkBinaryCallback}, "-L": {1, pr.linkBinaryCallback}, "-T": {1, pr.linkBinaryCallback}, "-u": {1, pr.linkBinaryCallback}, "-install_name": {1, pr.linkBinaryCallback}, "-e": {1, pr.linkBinaryCallback}, "-rpath": {1, pr.linkBinaryCallback}, "-shared": {0, pr.linkUnaryCallback}, "-static": {0, pr.linkUnaryCallback}, "-static-libgcc": {0, pr.linkUnaryCallback}, //iam: musl stuff "-pie": {0, pr.linkUnaryCallback}, "-nostdlib": {0, pr.linkUnaryCallback}, "-nodefaultlibs": {0, pr.linkUnaryCallback}, "-rdynamic": {0, pr.linkUnaryCallback}, "-dynamiclib": {0, pr.linkUnaryCallback}, "-current_version": {1, pr.linkBinaryCallback}, "-compatibility_version": {1, pr.linkBinaryCallback}, "-print-multi-directory": {0, pr.compileUnaryCallback}, "-print-multi-lib": {0, pr.compileUnaryCallback}, "-print-libgcc-file-name": {0, pr.compileUnaryCallback}, "-print-search-dirs": {0, pr.compileUnaryCallback}, "-fprofile-arcs": {0, pr.compileLinkUnaryCallback}, "-coverage": {0, pr.compileLinkUnaryCallback}, "--coverage": {0, pr.compileLinkUnaryCallback}, "-fopenmp": {0, pr.compileLinkUnaryCallback}, "-Wl,-dead_strip": {0, pr.warningLinkUnaryCallback}, "-dead_strip": {0, pr.warningLinkUnaryCallback}, //iam: tor does this. We lose the bitcode :-( } // iam: this is a list because matching needs to be done in order. // if you add a NEW pattern; make sure it is before any existing pattern that also // matches and has a conflicting flagInfo value. Also be careful with flags that can contain filenames, like // linker info flags or dependency flags var argPatterns = [...]argPattern{ // dependency file generation (comes first because it can conatin file names) {`^-MF.*$`, flagInfo{0, pr.compileUnaryCallback}}, //Write depfile output from -MMD, -MD, -MM, or -M to {`^-MJ.*$`, flagInfo{0, pr.compileUnaryCallback}}, //Write a compilation database entry per input {`^-MQ.*$`, flagInfo{0, pr.compileUnaryCallback}}, //Specify name of main file output to quote in depfile {`^-MT.*$`, flagInfo{0, pr.compileUnaryCallback}}, //Specify name of main file output in depfile //iam, need to be careful here, not mix up linker and warning flags. {`^-Wl,.+$`, flagInfo{0, pr.linkUnaryCallback}}, {`^-W[^l].*$`, flagInfo{0, pr.compileUnaryCallback}}, {`^-W[l][^,].*$`, flagInfo{0, pr.compileUnaryCallback}}, //iam: tor has a few -Wl... {`^-(l|L).+$`, flagInfo{0, pr.linkUnaryCallback}}, {`^-I.+$`, flagInfo{0, pr.compileUnaryCallback}}, {`^-D.+$`, flagInfo{0, pr.compileUnaryCallback}}, {`^-B.+$`, flagInfo{0, pr.compileLinkUnaryCallback}}, {`^-isystem.+$`, flagInfo{0, pr.compileLinkUnaryCallback}}, {`^-U.+$`, flagInfo{0, pr.compileUnaryCallback}}, {`^-fsanitize=.+$`, flagInfo{0, pr.compileLinkUnaryCallback}}, {`^-fuse-ld=.+$`, flagInfo{0, pr.linkUnaryCallback}}, //iam: musl stuff {`^-flto=.+$`, flagInfo{0, pr.linkTimeOptimizationCallback}}, //iam: new lto stuff {`^-f.+$`, flagInfo{0, pr.compileUnaryCallback}}, {`^-rtlib=.+$`, flagInfo{0, pr.linkUnaryCallback}}, {`^-std=.+$`, flagInfo{0, pr.compileUnaryCallback}}, {`^-stdlib=.+$`, flagInfo{0, pr.compileLinkUnaryCallback}}, {`^-mtune=.+$`, flagInfo{0, pr.compileUnaryCallback}}, {`^--sysroot=.+$`, flagInfo{0, pr.compileLinkUnaryCallback}}, //both compile and link time {`^-print-.*$`, flagInfo{0, pr.compileUnaryCallback}}, // generic catch all for the print commands {`^-mmacosx-version-min=.+$`, flagInfo{0, pr.compileLinkUnaryCallback}}, {`^-mstack-alignment=.+$`, flagInfo{0, pr.compileUnaryCallback}}, //iam, linux kernel stuff {`^-march=.+$`, flagInfo{0, pr.compileUnaryCallback}}, //iam: linux kernel stuff {`^-mregparm=.+$`, flagInfo{0, pr.compileUnaryCallback}}, //iam: linux kernel stuff {`^-mcmodel=.+$`, flagInfo{0, pr.compileUnaryCallback}}, //iam: linux kernel stuff {`^-mpreferred-stack-boundary=.+$`, flagInfo{0, pr.compileUnaryCallback}}, //iam: linux kernel stuff {`^-mindirect-branch=.+$`, flagInfo{0, pr.compileUnaryCallback}}, //iam: linux kernel stuff {`^--param=.+$`, flagInfo{0, pr.compileUnaryCallback}}, //iam: linux kernel stuff //the above come first because they are anchored at the start, and some can contain filenames. {`^.+\.(c|cc|cpp|C|cxx|i|s|S|bc)$`, flagInfo{0, pr.inputFileCallback}}, {`^.+\.([fF](|[0-9][0-9]|or|OR|pp|PP))$`, flagInfo{0, pr.inputFileCallback}}, //iam: it's a bit fragile as to what we recognize as an object file. // this also shows up in the compile function attachBitcodePathToObject, so additions // here, should also be additions there. {`^.+\.(o|lo|So|so|po|a|dylib|pico|nossppico)$`, flagInfo{0, pr.objectFileCallback}}, //iam: pico and nossppico are FreeBSD {`^.+\.dylib(\.\d)+$`, flagInfo{0, pr.objectFileCallback}}, {`^.+\.(So|so)(\.\d)+$`, flagInfo{0, pr.objectFileCallback}}, } for len(argList) > 0 { var elem = argList[0] // Try to match the flag exactly if fi, ok := argsExactMatches[elem]; ok { fi.handler(elem, argList[1:1+fi.arity]) argList = argList[1+fi.arity:] // else it is more complicated, either a pattern or a group } else { var listShift = 0 //need to handle the N-ary grouping flag if elem == "-Wl,--start-group" { endgroup := indexOf("-Wl,--end-group", argList) if endgroup > 0 { pr.linkerGroupCallback(elem, endgroup+1, argList) listShift = endgroup } else { LogWarning("Failed to find '-Wl,--end-group' matching '-Wl,--start-group'\n") pr.compileUnaryCallback(elem, argList[1:1]) } //else try to match a pattern } else { var matched = false for _, argPat := range argPatterns { pattern := argPat.pattern fi := argPat.finfo var regExp = regexp.MustCompile(pattern) if regExp.MatchString(elem) { fi.handler(elem, argList[1:1+fi.arity]) listShift = fi.arity matched = true break } } if !matched { ok, _ := IsObjectFileForOS(elem, runtime.GOOS) if ok { pr.objectFileCallback(elem, argList[1:1]) } else { LogWarning("Did not recognize the compiler flag: %v\n", elem) pr.compileUnaryCallback(elem, argList[1:1]) } } } argList = argList[1+listShift:] } } return pr } func indexOf(value string, slice []string) int { for p, v := range slice { if v == value { return p } } return -1 } // Return the object and bc filenames that correspond to the i-th source file func getArtifactNames(pr ParserResult, srcFileIndex int, hidden bool) (objBase string, bcBase string) { if len(pr.InputFiles) == 1 && pr.IsCompileOnly && len(pr.OutputFilename) > 0 { objBase = pr.OutputFilename dir, baseName := path.Split(objBase) bcBaseName := fmt.Sprintf(".%s.bc", baseName) bcBase = path.Join(dir, bcBaseName) } else { srcFile := pr.InputFiles[srcFileIndex] var _, baseNameWithExt = path.Split(srcFile) // issue #30: main.cpp and main.c cause conflicts. var baseName = strings.TrimSuffix(baseNameWithExt, filepath.Ext(baseNameWithExt)) bcBase = fmt.Sprintf(".%s.o.bc", baseNameWithExt) if hidden { objBase = fmt.Sprintf(".%s.o", baseNameWithExt) } else { objBase = fmt.Sprintf("%s.o", baseName) } } return } // Return a hash for the absolute object path func getHashedPath(path string) string { inputBytes := []byte(path) hasher := sha256.New() //Hash interface claims this never returns an error hasher.Write(inputBytes) hash := hex.EncodeToString(hasher.Sum(nil)) return hash } func (pr *ParserResult) inputFileCallback(flag string, _ []string) { var regExp = regexp.MustCompile(`\.(s|S)$`) pr.InputFiles = append(pr.InputFiles, flag) if regExp.MatchString(flag) { pr.IsAssembly = true } } func (pr *ParserResult) outputFileCallback(_ string, args []string) { pr.OutputFilename = args[0] } func (pr *ParserResult) objectFileCallback(flag string, _ []string) { // FIXME: the object file is appended to ObjectFiles that // is used nowhere else in the code pr.ObjectFiles = append(pr.ObjectFiles, flag) // We append the object files to link args to handle the // -Wl,--start-group obj_1.o ... obj_n.o -Wl,--end-group case pr.LinkArgs = append(pr.LinkArgs, flag) } func (pr *ParserResult) linkerGroupCallback(start string, count int, args []string) { group := args[0:count] pr.LinkArgs = append(pr.LinkArgs, group...) } func (pr *ParserResult) preprocessOnlyCallback(_ string, _ []string) { pr.IsPreprocessOnly = true } func (pr *ParserResult) dependencyOnlyCallback(flag string, _ []string) { pr.IsDependencyOnly = true pr.CompileArgs = append(pr.CompileArgs, flag) } func (pr *ParserResult) printOnlyCallback(flag string, _ []string) { pr.IsPrintOnly = true } func (pr *ParserResult) assembleOnlyCallback(_ string, _ []string) { pr.IsAssembleOnly = true } func (pr *ParserResult) verboseFlagCallback(_ string, _ []string) { pr.IsVerbose = true } func (pr *ParserResult) compileOnlyCallback(_ string, _ []string) { pr.IsCompileOnly = true } func (pr *ParserResult) emitLLVMCallback(_ string, _ []string) { pr.IsCompileOnly = true pr.IsEmitLLVM = true } func (pr *ParserResult) linkTimeOptimizationCallback(_ string, _ []string) { pr.IsLTO = true } func (pr *ParserResult) linkUnaryCallback(flag string, _ []string) { pr.LinkArgs = append(pr.LinkArgs, flag) } func (pr *ParserResult) compileUnaryCallback(flag string, _ []string) { pr.CompileArgs = append(pr.CompileArgs, flag) } func (pr *ParserResult) warningLinkUnaryCallback(flag string, _ []string) { LogWarning("The flag %v cannot be used with this tool, we ignore it, else we lose the bitcode section.\n", flag) pr.ForbiddenFlags = append(pr.ForbiddenFlags, flag) } func (pr *ParserResult) defaultBinaryCallback(_ string, _ []string) { // Do nothing } func (pr *ParserResult) dependencyBinaryCallback(flag string, args []string) { pr.CompileArgs = append(pr.CompileArgs, flag, args[0]) pr.IsDependencyOnly = true } func (pr *ParserResult) compileBinaryCallback(flag string, args []string) { pr.CompileArgs = append(pr.CompileArgs, flag, args[0]) } func (pr *ParserResult) linkBinaryCallback(flag string, args []string) { pr.LinkArgs = append(pr.LinkArgs, flag, args[0]) } func (pr *ParserResult) compileLinkUnaryCallback(flag string, _ []string) { pr.LinkArgs = append(pr.LinkArgs, flag) pr.CompileArgs = append(pr.CompileArgs, flag) } func (pr *ParserResult) compileLinkBinaryCallback(flag string, args []string) { pr.LinkArgs = append(pr.LinkArgs, flag, args[0]) pr.CompileArgs = append(pr.CompileArgs, flag, args[0]) }