Cara mendapatkan AST yang boleh dibaca manusia daripada kod C
clang pernah mempunyai fungsi ini dilaksanakan melalui bendera -emit-asm, walau bagaimanapun, ia telah dikeluarkan sejak itu. Namun, terdapat beberapa alternatif berdaya maju yang boleh anda gunakan untuk mencapai ini:
Program Fibonacci Mudah:
int fib(int n) { if (n == 0 || n == 1) return n; int fib1 = 0; int fib2 = 1; int fib = 0; for ( int i = 2; i < n; i++ ) { fib = fib1 + fib2; fib1 = fib2; fib2 = fib; } return fib; }
Perwakilan AST:
(translation_unit@Cpp~GCC4=2#4dc3a00^0 Line 1 Column 1 File C:/temp/fibonacci.cpp (function_definition@Cpp~GCC4=1615#4dc39e0^1#4dc3a00:1 Line 1 Column 1 File C:/temp/fibonacci.cpp (function_head@Cpp~GCC4=1627#4d89de0^1#4dc39e0:1 Line 1 Column 1 File C:/temp/fibonacci.cpp (simple_type_specifier@Cpp~GCC4=1109#4d89920^1#4d89de0:1 Line 1 Column 1 File C:/temp/fibonacci.cpp |('int'@Cpp~GCC4=2760#4d898c0^1#4d89920:1[Keyword:0] Line 1 Column 1 File C:/temp/fibonacci.cpp)'int' )simple_type_specifier (noptr_declarator@Cpp~GCC4=1401#4d89a80^1#4d89de0:2 Line 1 Column 5 File C:/temp/fibonacci.cpp |(IDENTIFIER@Cpp~GCC4=2645#4d89900^1#4d89a80:1[`fib'] Line 1 Column 5 File C:/temp/fibonacci.cpp)IDENTIFIER |('('@Cpp~GCC4=2885#4d89ac0^1#4d89a80:2[Keyword:0] Line 1 Column 8 File C:/temp/fibonacci.cpp)'(' |(parameter_declaration@Cpp~GCC4=1590#4d89e00^1#4d89a80:3 Line 1 Column 9 File C:/temp/fibonacci.cpp | (simple_type_specifier@Cpp~GCC4=1109#4d89b20^1#4d89e00:1 Line 1 Column 9 File C:/temp/fibonacci.cpp | ('int'@Cpp~GCC4=2760#4d89d60^1#4d89b20:1[Keyword:0] Line 1 Column 9 File C:/temp/fibonacci.cpp)'int' | )simple_type_specifier | (IDENTIFIER@Cpp~GCC4=2645#4d89b00^1#4d89e00:2[`n'] Line 1 Column 13 File C:/temp/fibonacci.cpp)IDENTIFIER |)parameter_declaration |(')'@Cpp~GCC4=2886#4d89bc0^1#4d89a80:4[Keyword:0] Line 1 Column 14 File C:/temp/fibonacci.cpp)')' |(function_qualifiers@Cpp~GCC4=1417#4d89dc0^1#4d89a80:5 Line 1 Column 16 File C:/temp/fibonacci.cpp)function_qualifiers )noptr_declarator )function_head (compound_statement@Cpp~GCC4=872#4dc39c0^1#4dc39e0:2 Line 1 Column 16 File C:/temp/fibonacci.cpp ('{'@Cpp~GCC4=2938#4d89f20^1#4dc39c0:1[Keyword:0] Line 1 Column 16 File C:/temp/fibonacci.cpp)'{' (statement_seq@Cpp~GCC4=876#4dc3060^1#4dc39c0:2 Line 2 Column 5 File C:/temp/fibonacci.cpp |(statement_seq@Cpp~GCC4=876#4dc3920^1#4dc3060:1 Line 2 Column 5 File C:/temp/fibonacci.cpp | (statement_seq@Cpp~GCC4=876#4dc2880^1#4dc3920:1 Line 2 Column 5 File C:/temp/fibonacci.cpp | (statement_seq@Cpp~GCC4=876#4dc2700^1#4dc2880:1 Line 2 Column 5 File C:/temp/fibonacci.cpp | (statement_seq@Cpp~GCC4=876#4dc2640^1#4dc2700:1 Line 2 Column 5 File C:/temp/fibonacci.cpp | |(selection_statement@Cpp~GCC4=892#4dc25c0^1#4dc2640:1 Line 2 Column 5 File C:/temp/fibonacci.cpp | | ('if'@Cpp~GCC4=2753#4d89f40^1#4dc25c0:1[Keyword:0] Line 2 Column 5 File C:/temp/fibonacci.cpp)'if' | | ('('@Cpp~GCC4=2885#4d89f60^1#4dc25c0:2[Keyword:0] Line 2 Column 8 File C:/temp/fibonacci.cpp)'(' | | (logical_or_expression@Cpp~GCC4=763#4dc2220^1#4dc25c0:3 Line 2 Column 10 File C:/temp/fibonacci.cpp | | (equality_expression@Cpp~GCC4=696#4d89fa0^1#4dc2220:1 Line 2 Column 10 File C:/temp/fibonacci.cpp | | (IDENTIFIER@Cpp~GCC4=2645#4d89d80^1#4d89fa0:1[`n'] Line 2 Column 10 File C:/temp/fibonacci.cpp)IDENTIFIER | | ('=='@Cpp~GCC4=2918#4d89da0^1#4d89fa0:2[Keyword:0] Line 2 Column 12 File C:/temp/fibonacci.cpp)'==' | | (INT_LITERAL@Cpp~GCC4=2809#4d89fe0^1#4d89fa0:3[0] Line 2 Column 15 File C:/temp/fibonacci.cpp)INT_LITERAL | | )equality_expression | | ('||'@Cpp~GCC4=2922#4d89f80^1#4dc2220:2[Keyword:0] Line 2 Column 17 File C:/temp/fibonacci.cpp)'||' | | (equality_expression@Cpp~GCC4=696#4dc2200^1#4dc2220:3 Line 2 Column 20 File C:/temp/fibonacci.cpp | | (IDENTIFIER@Cpp~GCC4=2645#4dc2180^1#4dc2200:1[`n'] Line 2 Column 20 File C:/temp/fibonacci.cpp)IDENTIFIER | | ('=='@Cpp~GCC4=2918#4dc21a0^1#4dc2200:2[Keyword:0] Line 2 Column 22 File C:/temp/fibonacci.cpp)'==' | | (INT_LITERAL@Cpp~GCC4=2809#4dc21c0^1#4dc2200:3[1] Line 2 Column 25 File C:/temp/fibonacci.cpp)INT_LITERAL | | )equality_expression | | )logical_or_expression
Atas ialah kandungan terperinci Bagaimana untuk mendapatkan Pokok Sintaks Abstrak (AST) yang boleh dibaca manusia daripada kod C menggunakan kaedah alternatif memandangkan bendera `-emit-asm` dalam dentang tidak lagi tersedia?. Untuk maklumat lanjut, sila ikut artikel berkaitan lain di laman web China PHP!