How to wrap a system call (libc function) in Linux demonstrates LD_PRELOAD and ld --wrap techniques.
Generic Library Interception for Improved Performance Measurement and Insight describes creation of wrappers for arbitrary C/C++ libraries in Score-P. See the library_wrapper_generator source code, which uses Clang under the hood.
| goos: linux | |
| goarch: amd64 | |
| pkg: crypto/cipher | |
| BenchmarkAESGCMSeal1K-8 20815730 557 ns/op 1837.65 MB/s | |
| BenchmarkAESGCMOpen1K-8 22296660 533 ns/op 1921.06 MB/s | |
| BenchmarkAESGCMSign8K-8 5809227 2065 ns/op 3968.00 MB/s | |
| BenchmarkAESGCMSeal8K-8 3583026 3364 ns/op 2434.99 MB/s | |
| BenchmarkAESGCMOpen8K-8 3652791 3291 ns/op 2488.84 MB/s | |
| BenchmarkAESCTR1K-8 4263354 2814 ns/op 362.08 MB/s | |
| BenchmarkAESCTR8K-8 547248 21890 ns/op 374.01 MB/s |
| --- PASS: TestEnsembleResultsInversionChains/curve25519_field (36.96s) | |
| ensemble_test.go:155: n-2=7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffeb | |
| ensemble_test.go:177: best: opt(runs(continued_fractions(dichotomic))) | |
| ensemble_test.go:178: total: 266 | |
| ensemble_test.go:181: known: 265 | |
| ensemble_test.go:182: delta: +1 | |
| --- PASS: TestEnsembleResultsInversionChains/p256_field (25.46s) | |
| ensemble_test.go:155: n-3=ffffffff00000001000000000000000000000000fffffffffffffffffffffffc | |
| ensemble_test.go:177: best: opt(runs(continued_fractions(dichotomic))) | |
| ensemble_test.go:178: total: 266 |
| package main | |
| import ( | |
| "crypto/elliptic" | |
| "crypto/rand" | |
| "fmt" | |
| "log" | |
| "math/big" | |
| "github.com/cloudflare/circl/ecc/p384" |
| # | |
| # Opcode values. | |
| # | |
| HALT = 0 | |
| LOAD = 1 | |
| STORE = 2 | |
| ADDC = 3 | |
| MVAC = 4 | |
| JEQ = 5 | |
| JLT = 6 |
Elementary school multiplication in avo.
| package main | |
| import ( | |
| "errors" | |
| "go/constant" | |
| "go/token" | |
| "go/types" | |
| "log" | |
| ) |
| TEXT ·Imm(SB),0,$0 | |
| // types | |
| ADDQ $1, AX | |
| // ADDQ $0.3, AX | |
| // ADDQ $"hellowor", AX | |
| ADDSD $(3.141), X0 | |
| // ADDSD $20, X0 | |
| // sizes | |
| // Yu2 |
| #include "textflag.h" | |
| DATA b<>+0(SB)/8, $0x0011223344556677 | |
| DATA b<>+8(SB)/8, $"strconst" | |
| DATA b<>+16(SB)/8, $3.141592 | |
| DATA b<>+24(SB)/4, $3.141592 | |
| // 28-31: empty | |
| DATA b<>+32(SB)/4, $0x00112233 | |
| DATA b<>+36(SB)/2, $0x4455 | |
| DATA b<>+38(SB)/1, $0x66 |
| package argsize | |
| func Index3(a [7]byte) byte | |
| func Expect(a [7]byte) byte { return a[3] } |