Compare commits
2 commits
| Author | SHA1 | Date | |
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13835a4b41 | ||
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d8e61a829c |
4 changed files with 798 additions and 124 deletions
24
README.md
24
README.md
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@ -1,14 +1,20 @@
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c4 - C in four functions
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========================
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c5 - C in four functions + AST + back-end code generator
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========================================================
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An exercise in minimalism.
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This branch extends **c4.c** by adding:
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* Abstract Syntax Tree creation
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* Back-end code generator function: **gen()**
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* Standard ordering of function parameters on stack
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* Native x86 version: **c5x86.c**
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* Various optimizations
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Try the following:
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gcc -o c4 c4.c (you may need the -m32 option on 64bit machines)
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./c4 hello.c
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./c4 -s hello.c
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./c4 c4.c hello.c
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./c4 c4.c c4.c hello.c
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gcc -o c5 c5.c (you may need the -m32 option on 64bit machines)
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./c5 hello.c
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./c5 -s hello.c
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./c5 c5.c hello.c
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./c5 c5.c c5.c hello.c
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287
c4.c → c5.c
287
c4.c → c5.c
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@ -1,33 +1,39 @@
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// c4.c - C in four functions
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// c5.c - C in five functions
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// char, int, and pointer types
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// if, while, return, and expression statements
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// just enough features to allow self-compilation and a bit more
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// c4.c plus
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// abstract syntax tree creation
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// back-end code generator
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// parameters passed in correct order
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// various optimizations
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// Written by Robert Swierczek
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <memory.h>
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#include <unistd.h>
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#include <fcntl.h>
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#ifdef _WIN32
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#include "w32.h"
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#endif
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char *p, *lp, // current position in source code
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*data; // data/bss pointer
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int *e, *le, // current position in emitted code
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*id, // currently parsed identifier
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*n, // current node in abstract syntax tree
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*sym, // symbol table (simple list of identifiers)
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tk, // current token
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ival, // current token value
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ty, // current expression type
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loc, // local variable offset
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line, // current line number
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src, // print source and assembly flag
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debug; // print executed instructions
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// tokens and classes (operators last and in precedence order)
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enum {
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Num = 128, Fun, Sys, Glo, Loc, Id,
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Num = 128, Fun, Sys, Glo, Loc, Id, Load, Enter,
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Char, Else, Enum, If, Int, Return, Sizeof, While,
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Assign, Cond, Lor, Lan, Or, Xor, And, Eq, Ne, Lt, Gt, Le, Ge, Shl, Shr, Add, Sub, Mul, Div, Mod, Inc, Dec, Brak
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};
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@ -35,7 +41,7 @@ enum {
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// opcodes
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enum { LEA ,IMM ,JMP ,JSR ,BZ ,BNZ ,ENT ,ADJ ,LEV ,LI ,LC ,SI ,SC ,PSH ,
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OR ,XOR ,AND ,EQ ,NE ,LT ,GT ,LE ,GE ,SHL ,SHR ,ADD ,SUB ,MUL ,DIV ,MOD ,
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OPEN,READ,CLOS,PRTF,MALC,MSET,MCMP,EXIT };
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OPEN,READ,CLOS,PRTF,MALC,MSET,MCMP,MCPY,MMAP,DSYM,QSRT,EXIT };
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// types
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enum { CHAR, INT, PTR };
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@ -56,7 +62,7 @@ void next()
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while (le < e) {
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printf("%8.4s", &"LEA ,IMM ,JMP ,JSR ,BZ ,BNZ ,ENT ,ADJ ,LEV ,LI ,LC ,SI ,SC ,PSH ,"
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"OR ,XOR ,AND ,EQ ,NE ,LT ,GT ,LE ,GE ,SHL ,SHR ,ADD ,SUB ,MUL ,DIV ,MOD ,"
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"OPEN,READ,CLOS,PRTF,MALC,MSET,MCMP,EXIT,"[*++le * 5]);
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"OPEN,READ,CLOS,PRTF,MALC,MSET,MCMP,MCPY,MMAP,DSYM,QSRT,EXIT,"[*++le * 5]);
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if (*le <= ADJ) printf(" %d\n", *++le); else printf("\n");
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}
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}
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@ -131,12 +137,12 @@ void next()
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void expr(int lev)
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{
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int t, *d;
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int t, *d, *b;
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if (!tk) { printf("%d: unexpected eof in expression\n", line); exit(-1); }
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else if (tk == Num) { *++e = IMM; *++e = ival; next(); ty = INT; }
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else if (tk == Num) { *--n = ival; *--n = Num; next(); ty = INT; }
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else if (tk == '"') {
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*++e = IMM; *++e = ival; next();
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*--n = ival; *--n = Num; next();
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while (tk == '"') next();
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data = (char *)((int)data + sizeof(int) & -sizeof(int)); ty = PTR;
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}
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@ -145,28 +151,26 @@ void expr(int lev)
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ty = INT; if (tk == Int) next(); else if (tk == Char) { next(); ty = CHAR; }
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while (tk == Mul) { next(); ty = ty + PTR; }
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if (tk == ')') next(); else { printf("%d: close paren expected in sizeof\n", line); exit(-1); }
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*++e = IMM; *++e = (ty == CHAR) ? sizeof(char) : sizeof(int);
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*--n = (ty == CHAR) ? sizeof(char) : sizeof(int); *--n = Num;
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ty = INT;
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}
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else if (tk == Id) {
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d = id; next();
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if (tk == '(') {
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if (d[Class] != Sys && d[Class] != Fun) { printf("%d: bad function call\n", line); exit(-1); }
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next();
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t = 0;
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while (tk != ')') { expr(Assign); *++e = PSH; ++t; if (tk == ',') next(); }
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t = 0; b = 0;
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while (tk != ')') { expr(Assign); *--n = (int)b; b = n; ++t; if (tk == ',') next(); }
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next();
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if (d[Class] == Sys) *++e = d[Val];
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else if (d[Class] == Fun) { *++e = JSR; *++e = d[Val]; }
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else { printf("%d: bad function call\n", line); exit(-1); }
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if (t) { *++e = ADJ; *++e = t; }
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*--n = t; *--n = d[Val]; *--n = (int)b; *--n = d[Class];
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ty = d[Type];
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}
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else if (d[Class] == Num) { *++e = IMM; *++e = d[Val]; ty = INT; }
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else if (d[Class] == Num) { *--n = d[Val]; *--n = Num; ty = INT; }
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else {
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if (d[Class] == Loc) { *++e = LEA; *++e = loc - d[Val]; }
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else if (d[Class] == Glo) { *++e = IMM; *++e = d[Val]; }
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if (d[Class] == Loc) { *--n = d[Val]; *--n = Loc; }
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else if (d[Class] == Glo) { *--n = d[Val]; *--n = Num; }
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else { printf("%d: undefined variable\n", line); exit(-1); }
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*++e = ((ty = d[Type]) == CHAR) ? LC : LI;
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*--n = ty = d[Type]; *--n = Load;
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}
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}
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else if (tk == '(') {
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@ -186,94 +190,89 @@ void expr(int lev)
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else if (tk == Mul) {
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next(); expr(Inc);
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if (ty > INT) ty = ty - PTR; else { printf("%d: bad dereference\n", line); exit(-1); }
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*++e = (ty == CHAR) ? LC : LI;
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*--n = ty; *--n = Load;
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}
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else if (tk == And) {
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next(); expr(Inc);
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if (*e == LC || *e == LI) --e; else { printf("%d: bad address-of\n", line); exit(-1); }
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if (*n == Load) n = n+2; else { printf("%d: bad address-of\n", line); exit(-1); }
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ty = ty + PTR;
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}
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else if (tk == '!') { next(); expr(Inc); *++e = PSH; *++e = IMM; *++e = 0; *++e = EQ; ty = INT; }
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else if (tk == '~') { next(); expr(Inc); *++e = PSH; *++e = IMM; *++e = -1; *++e = XOR; ty = INT; }
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else if (tk == '!') {
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next(); expr(Inc);
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if (*n == Num) n[1] = !n[1]; else { *--n = 0; *--n = Num; --n; *n = (int)(n+3); *--n = Eq; }
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ty = INT;
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}
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else if (tk == '~') {
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next(); expr(Inc);
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if (*n == Num) n[1] = ~n[1]; else { *--n = -1; *--n = Num; --n; *n = (int)(n+3); *--n = Xor; }
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ty = INT;
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}
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else if (tk == Add) { next(); expr(Inc); ty = INT; }
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else if (tk == Sub) {
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next(); *++e = IMM;
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if (tk == Num) { *++e = -ival; next(); } else { *++e = -1; *++e = PSH; expr(Inc); *++e = MUL; }
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next(); expr(Inc);
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if (*n == Num) n[1] = -n[1]; else { *--n = -1; *--n = Num; --n; *n = (int)(n+3); *--n = Mul; }
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ty = INT;
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}
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else if (tk == Inc || tk == Dec) {
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t = tk; next(); expr(Inc);
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if (*e == LC) { *e = PSH; *++e = LC; }
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else if (*e == LI) { *e = PSH; *++e = LI; }
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else { printf("%d: bad lvalue in pre-increment\n", line); exit(-1); }
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*++e = PSH;
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*++e = IMM; *++e = (ty > PTR) ? sizeof(int) : sizeof(char);
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*++e = (t == Inc) ? ADD : SUB;
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*++e = (ty == CHAR) ? SC : SI;
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if (*n == Load) *n = t; else { printf("%d: bad lvalue in pre-increment\n", line); exit(-1); }
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}
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else { printf("%d: bad expression\n", line); exit(-1); }
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while (tk >= lev) { // "precedence climbing" or "Top Down Operator Precedence" method
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t = ty;
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t = ty; b = n;
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if (tk == Assign) {
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next();
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if (*e == LC || *e == LI) *e = PSH; else { printf("%d: bad lvalue in assignment\n", line); exit(-1); }
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expr(Assign); *++e = ((ty = t) == CHAR) ? SC : SI;
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if (*n != Load) { printf("%d: bad lvalue in assignment\n", line); exit(-1); }
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expr(Assign); *--n = (int)(b+2); *--n = ty = t; *--n = Assign;
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}
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else if (tk == Cond) {
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next();
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*++e = BZ; d = ++e;
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expr(Assign);
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if (tk == ':') next(); else { printf("%d: conditional missing colon\n", line); exit(-1); }
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*d = (int)(e + 3); *++e = JMP; d = ++e;
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d = n;
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expr(Cond);
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*d = (int)(e + 1);
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--n; *n = (int)(n+1); *--n = (int)d; *--n = (int)b; *--n = Cond;
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}
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else if (tk == Lor) { next(); *++e = BNZ; d = ++e; expr(Lan); *d = (int)(e + 1); ty = INT; }
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else if (tk == Lan) { next(); *++e = BZ; d = ++e; expr(Or); *d = (int)(e + 1); ty = INT; }
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else if (tk == Or) { next(); *++e = PSH; expr(Xor); *++e = OR; ty = INT; }
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else if (tk == Xor) { next(); *++e = PSH; expr(And); *++e = XOR; ty = INT; }
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else if (tk == And) { next(); *++e = PSH; expr(Eq); *++e = AND; ty = INT; }
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else if (tk == Eq) { next(); *++e = PSH; expr(Lt); *++e = EQ; ty = INT; }
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else if (tk == Ne) { next(); *++e = PSH; expr(Lt); *++e = NE; ty = INT; }
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else if (tk == Lt) { next(); *++e = PSH; expr(Shl); *++e = LT; ty = INT; }
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else if (tk == Gt) { next(); *++e = PSH; expr(Shl); *++e = GT; ty = INT; }
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else if (tk == Le) { next(); *++e = PSH; expr(Shl); *++e = LE; ty = INT; }
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else if (tk == Ge) { next(); *++e = PSH; expr(Shl); *++e = GE; ty = INT; }
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else if (tk == Shl) { next(); *++e = PSH; expr(Add); *++e = SHL; ty = INT; }
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else if (tk == Shr) { next(); *++e = PSH; expr(Add); *++e = SHR; ty = INT; }
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else if (tk == Lor) { next(); expr(Lan); if (*n==Num && *b==Num) n[1] = b[1] || n[1]; else { *--n = (int)b; *--n = Lor; } ty = INT; }
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else if (tk == Lan) { next(); expr(Or); if (*n==Num && *b==Num) n[1] = b[1] && n[1]; else { *--n = (int)b; *--n = Lan; } ty = INT; }
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else if (tk == Or) { next(); expr(Xor); if (*n==Num && *b==Num) n[1] = b[1] | n[1]; else { *--n = (int)b; *--n = Or; } ty = INT; }
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else if (tk == Xor) { next(); expr(And); if (*n==Num && *b==Num) n[1] = b[1] ^ n[1]; else { *--n = (int)b; *--n = Xor; } ty = INT; }
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else if (tk == And) { next(); expr(Eq); if (*n==Num && *b==Num) n[1] = b[1] & n[1]; else { *--n = (int)b; *--n = And; } ty = INT; }
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else if (tk == Eq) { next(); expr(Lt); if (*n==Num && *b==Num) n[1] = b[1] == n[1]; else { *--n = (int)b; *--n = Eq; } ty = INT; }
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else if (tk == Ne) { next(); expr(Lt); if (*n==Num && *b==Num) n[1] = b[1] != n[1]; else { *--n = (int)b; *--n = Ne; } ty = INT; }
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else if (tk == Lt) { next(); expr(Shl); if (*n==Num && *b==Num) n[1] = b[1] < n[1]; else { *--n = (int)b; *--n = Lt; } ty = INT; }
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else if (tk == Gt) { next(); expr(Shl); if (*n==Num && *b==Num) n[1] = b[1] > n[1]; else { *--n = (int)b; *--n = Gt; } ty = INT; }
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else if (tk == Le) { next(); expr(Shl); if (*n==Num && *b==Num) n[1] = b[1] <= n[1]; else { *--n = (int)b; *--n = Le; } ty = INT; }
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else if (tk == Ge) { next(); expr(Shl); if (*n==Num && *b==Num) n[1] = b[1] >= n[1]; else { *--n = (int)b; *--n = Ge; } ty = INT; }
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else if (tk == Shl) { next(); expr(Add); if (*n==Num && *b==Num) n[1] = b[1] << n[1]; else { *--n = (int)b; *--n = Shl; } ty = INT; }
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else if (tk == Shr) { next(); expr(Add); if (*n==Num && *b==Num) n[1] = b[1] >> n[1]; else { *--n = (int)b; *--n = Shr; } ty = INT; }
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else if (tk == Add) {
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next(); *++e = PSH; expr(Mul);
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if ((ty = t) > PTR) { *++e = PSH; *++e = IMM; *++e = sizeof(int); *++e = MUL; }
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*++e = ADD;
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next(); expr(Mul);
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if ((ty = t) > PTR) { if (*n == Num) n[1] = n[1] * sizeof(int); else { *--n = sizeof(int); *--n = Num; --n; *n = (int)(n+3); *--n = Mul; } }
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if (*n == Num && *b == Num) n[1] = b[1] + n[1]; else { *--n = (int)b; *--n = Add; }
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}
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else if (tk == Sub) {
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next(); *++e = PSH; expr(Mul);
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if (t > PTR && t == ty) { *++e = SUB; *++e = PSH; *++e = IMM; *++e = sizeof(int); *++e = DIV; ty = INT; }
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else if ((ty = t) > PTR) { *++e = PSH; *++e = IMM; *++e = sizeof(int); *++e = MUL; *++e = SUB; }
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else *++e = SUB;
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next(); expr(Mul);
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if ((ty = t) > PTR) { if (*n == Num) n[1] = n[1] * sizeof(int); else { *--n = sizeof(int); *--n = Num; --n; *n = (int)(n+3); *--n = Mul; } }
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if (*n == Num && *b == Num) n[1] = b[1] - n[1]; else { *--n = (int)b; *--n = Sub; }
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}
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else if (tk == Mul) { next(); *++e = PSH; expr(Inc); *++e = MUL; ty = INT; }
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else if (tk == Div) { next(); *++e = PSH; expr(Inc); *++e = DIV; ty = INT; }
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else if (tk == Mod) { next(); *++e = PSH; expr(Inc); *++e = MOD; ty = INT; }
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else if (tk == Mul) { next(); expr(Inc); if (*n==Num && *b==Num) n[1] = b[1] * n[1]; else { *--n = (int)b; *--n = Mul; } ty = INT; }
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else if (tk == Div) { next(); expr(Inc); if (*n==Num && *b==Num) n[1] = b[1] / n[1]; else { *--n = (int)b; *--n = Div; } ty = INT; }
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else if (tk == Mod) { next(); expr(Inc); if (*n==Num && *b==Num) n[1] = b[1] % n[1]; else { *--n = (int)b; *--n = Mod; } ty = INT; }
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else if (tk == Inc || tk == Dec) {
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if (*e == LC) { *e = PSH; *++e = LC; }
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else if (*e == LI) { *e = PSH; *++e = LI; }
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else { printf("%d: bad lvalue in post-increment\n", line); exit(-1); }
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*++e = PSH; *++e = IMM; *++e = (ty > PTR) ? sizeof(int) : sizeof(char);
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*++e = (tk == Inc) ? ADD : SUB;
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*++e = (ty == CHAR) ? SC : SI;
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*++e = PSH; *++e = IMM; *++e = (ty > PTR) ? sizeof(int) : sizeof(char);
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*++e = (tk == Inc) ? SUB : ADD;
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if (*n == Load) *n = tk; else { printf("%d: bad lvalue in post-increment\n", line); exit(-1); }
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*--n = (ty > PTR) ? sizeof(int) : sizeof(char); *--n = Num;
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*--n = (int)b; *--n = (tk == Inc) ? Sub : Add;
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next();
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}
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else if (tk == Brak) {
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next(); *++e = PSH; expr(Assign);
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next(); expr(Assign);
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if (tk == ']') next(); else { printf("%d: close bracket expected\n", line); exit(-1); }
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if (t > PTR) { *++e = PSH; *++e = IMM; *++e = sizeof(int); *++e = MUL; }
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if (t > PTR) { if (*n == Num) n[1] = n[1] * sizeof(int); else { *--n = sizeof(int); *--n = Num; --n; *n = (int)(n+3); *--n = Mul; } }
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else if (t < PTR) { printf("%d: pointer type expected\n", line); exit(-1); }
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*++e = ADD;
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*++e = ((ty = t - PTR) == CHAR) ? LC : LI;
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if (*n == Num && *b == Num) n[1] = b[1] + n[1]; else { *--n = (int)b; *--n = Add; }
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*--n = ty = t - PTR; *--n = Load;
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}
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else { printf("%d: compiler error tk=%d\n", line, tk); exit(-1); }
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}
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|
|
@ -281,46 +280,39 @@ void expr(int lev)
|
|||
|
||||
void stmt()
|
||||
{
|
||||
int *a, *b;
|
||||
int *a, *b, *c;
|
||||
|
||||
if (tk == If) {
|
||||
next();
|
||||
if (tk == '(') next(); else { printf("%d: open paren expected\n", line); exit(-1); }
|
||||
expr(Assign);
|
||||
expr(Assign); a = n;
|
||||
if (tk == ')') next(); else { printf("%d: close paren expected\n", line); exit(-1); }
|
||||
*++e = BZ; b = ++e;
|
||||
stmt();
|
||||
if (tk == Else) {
|
||||
*b = (int)(e + 3); *++e = JMP; b = ++e;
|
||||
next();
|
||||
stmt();
|
||||
}
|
||||
*b = (int)(e + 1);
|
||||
stmt(); b = n;
|
||||
if (tk == Else) { next(); stmt(); c = n; } else c = 0;
|
||||
*--n = (int)c; *--n = (int)b; *--n = (int)a; *--n = Cond;
|
||||
}
|
||||
else if (tk == While) {
|
||||
next();
|
||||
a = e + 1;
|
||||
if (tk == '(') next(); else { printf("%d: open paren expected\n", line); exit(-1); }
|
||||
expr(Assign);
|
||||
expr(Assign); a = n;
|
||||
if (tk == ')') next(); else { printf("%d: close paren expected\n", line); exit(-1); }
|
||||
*++e = BZ; b = ++e;
|
||||
stmt();
|
||||
*++e = JMP; *++e = (int)a;
|
||||
*b = (int)(e + 1);
|
||||
*--n = (int)a; *--n = While;
|
||||
}
|
||||
else if (tk == Return) {
|
||||
next();
|
||||
if (tk != ';') expr(Assign);
|
||||
*++e = LEV;
|
||||
if (tk != ';') { expr(Assign); a = n; } else a = 0;
|
||||
if (tk == ';') next(); else { printf("%d: semicolon expected\n", line); exit(-1); }
|
||||
*--n = (int)a; *--n = Return;
|
||||
}
|
||||
else if (tk == '{') {
|
||||
next();
|
||||
while (tk != '}') stmt();
|
||||
*--n = ';';
|
||||
while (tk != '}') { a = n; stmt(); *--n = (int)a; *--n = '{'; }
|
||||
next();
|
||||
}
|
||||
else if (tk == ';') {
|
||||
next();
|
||||
next(); *--n = ';';
|
||||
}
|
||||
else {
|
||||
expr(Assign);
|
||||
|
|
@ -328,16 +320,74 @@ void stmt()
|
|||
}
|
||||
}
|
||||
|
||||
void gen(int *n)
|
||||
{
|
||||
int i, *a, *b;
|
||||
|
||||
i = *n;
|
||||
if (i == Num) { *++e = IMM; *++e = n[1]; }
|
||||
else if (i == Loc) { *++e = LEA; *++e = n[1]; }
|
||||
else if (i == Load) { gen(n+2); *++e = (n[1] == CHAR) ? LC : LI; }
|
||||
else if (i == Assign) { gen((int *)n[2]); *++e = PSH; gen(n+3); *++e = (n[1] == CHAR) ? SC : SI; }
|
||||
else if (i == Inc || i == Dec) {
|
||||
gen(n+2);
|
||||
*++e = PSH; *++e = (n[1] == CHAR) ? LC : LI; *++e = PSH;
|
||||
*++e = IMM; *++e = (n[1] > PTR) ? sizeof(int) : sizeof(char);
|
||||
*++e = (i == Inc) ? ADD : SUB;
|
||||
*++e = (n[1] == CHAR) ? SC : SI;
|
||||
}
|
||||
else if (i == Cond) {
|
||||
gen((int *)n[1]);
|
||||
*++e = BZ; b = ++e;
|
||||
gen((int *)n[2]);
|
||||
if (n[3]) { *b = (int)(e + 3); *++e = JMP; b = ++e; gen((int *)n[3]); }
|
||||
*b = (int)(e + 1);
|
||||
}
|
||||
else if (i == Lor) { gen((int *)n[1]); *++e = BNZ; b = ++e; gen(n+2); *b = (int)(e + 1); }
|
||||
else if (i == Lan) { gen((int *)n[1]); *++e = BZ; b = ++e; gen(n+2); *b = (int)(e + 1); }
|
||||
else if (i == Or) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = OR; }
|
||||
else if (i == Xor) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = XOR; }
|
||||
else if (i == And) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = AND; }
|
||||
else if (i == Eq) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = EQ; }
|
||||
else if (i == Ne) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = NE; }
|
||||
else if (i == Lt) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = LT; }
|
||||
else if (i == Gt) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = GT; }
|
||||
else if (i == Le) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = LE; }
|
||||
else if (i == Ge) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = GE; }
|
||||
else if (i == Shl) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = SHL; }
|
||||
else if (i == Shr) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = SHR; }
|
||||
else if (i == Add) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = ADD; }
|
||||
else if (i == Sub) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = SUB; }
|
||||
else if (i == Mul) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = MUL; }
|
||||
else if (i == Div) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = DIV; }
|
||||
else if (i == Mod) { gen((int *)n[1]); *++e = PSH; gen(n+2); *++e = MOD; }
|
||||
else if (i == Sys || i == Fun) {
|
||||
b = (int *)n[1];
|
||||
while (b) { gen(b+1); *++e = PSH; b = (int *)*b; }
|
||||
if (i == Fun) *++e = JSR; *++e = n[2];
|
||||
if (n[3]) { *++e = ADJ; *++e = n[3]; }
|
||||
}
|
||||
else if (i == While) {
|
||||
*++e = JMP; b = ++e; gen(n+2); *b = (int)(e + 1);
|
||||
gen((int *)n[1]);
|
||||
*++e = BNZ; *++e = (int)(b + 1);
|
||||
}
|
||||
else if (i == Return) { if (n[1]) gen((int *)n[1]); *++e = LEV; }
|
||||
else if (i == '{') { gen((int *)n[1]); gen(n+2); }
|
||||
else if (i == Enter) { *++e = ENT; *++e = n[1]; gen(n+2); *++e = LEV; }
|
||||
else if (i != ';') { printf("%d: compiler error gen=%d\n", line, i); exit(-1); }
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
int fd, bt, ty, poolsz, *idmain;
|
||||
int fd, bt, ty, poolsz, *idmain, *ast;
|
||||
int *pc, *sp, *bp, a, cycle; // vm registers
|
||||
int i, *t; // temps
|
||||
|
||||
--argc; ++argv;
|
||||
if (argc > 0 && **argv == '-' && (*argv)[1] == 's') { src = 1; --argc; ++argv; }
|
||||
if (argc > 0 && **argv == '-' && (*argv)[1] == 'd') { debug = 1; --argc; ++argv; }
|
||||
if (argc < 1) { printf("usage: c4 [-s] [-d] file ...\n"); return -1; }
|
||||
if (argc < 1) { printf("usage: c5 [-s] [-d] file ...\n"); return -1; }
|
||||
|
||||
if ((fd = open(*argv, 0)) < 0) { printf("could not open(%s)\n", *argv); return -1; }
|
||||
|
||||
|
|
@ -346,13 +396,15 @@ int main(int argc, char **argv)
|
|||
if (!(le = e = malloc(poolsz))) { printf("could not malloc(%d) text area\n", poolsz); return -1; }
|
||||
if (!(data = malloc(poolsz))) { printf("could not malloc(%d) data area\n", poolsz); return -1; }
|
||||
if (!(sp = malloc(poolsz))) { printf("could not malloc(%d) stack area\n", poolsz); return -1; }
|
||||
if (!(ast = malloc(poolsz))) { printf("could not malloc(%d) abstract syntax tree area\n", poolsz); return -1; }
|
||||
ast = (int *)((int)ast + poolsz); // abstract syntax tree is most efficiently built as a stack
|
||||
|
||||
memset(sym, 0, poolsz);
|
||||
memset(e, 0, poolsz);
|
||||
memset(data, 0, poolsz);
|
||||
|
||||
p = "char else enum if int return sizeof while "
|
||||
"open read close printf malloc memset memcmp exit void main";
|
||||
"open read close printf malloc memset memcmp memcpy mmap dlsym qsort exit void main";
|
||||
i = Char; while (i <= While) { next(); id[Tk] = i++; } // add keywords to symbol table
|
||||
i = OPEN; while (i <= EXIT) { next(); id[Class] = Sys; id[Type] = INT; id[Val] = i++; } // add library to symbol table
|
||||
next(); id[Tk] = Char; // handle void type
|
||||
|
|
@ -381,9 +433,9 @@ int main(int argc, char **argv)
|
|||
next();
|
||||
if (tk == Assign) {
|
||||
next();
|
||||
if (tk != Num) { printf("%d: bad enum initializer\n", line); return -1; }
|
||||
i = ival;
|
||||
next();
|
||||
n = ast; expr(Cond);
|
||||
if (*n != Num) { printf("%d: bad enum initializer\n", line); return -1; }
|
||||
i = n[1];
|
||||
}
|
||||
id[Class] = Num; id[Type] = INT; id[Val] = i++;
|
||||
if (tk == ',') next();
|
||||
|
|
@ -401,7 +453,7 @@ int main(int argc, char **argv)
|
|||
if (tk == '(') { // function
|
||||
id[Class] = Fun;
|
||||
id[Val] = (int)(e + 1);
|
||||
next(); i = 0;
|
||||
next(); i = 2;
|
||||
while (tk != ')') {
|
||||
ty = INT;
|
||||
if (tk == Int) next();
|
||||
|
|
@ -417,7 +469,7 @@ int main(int argc, char **argv)
|
|||
}
|
||||
next();
|
||||
if (tk != '{') { printf("%d: bad function definition\n", line); return -1; }
|
||||
loc = ++i;
|
||||
i = 0;
|
||||
next();
|
||||
while (tk == Int || tk == Char) {
|
||||
bt = (tk == Int) ? INT : CHAR;
|
||||
|
|
@ -429,15 +481,16 @@ int main(int argc, char **argv)
|
|||
if (id[Class] == Loc) { printf("%d: duplicate local definition\n", line); return -1; }
|
||||
id[HClass] = id[Class]; id[Class] = Loc;
|
||||
id[HType] = id[Type]; id[Type] = ty;
|
||||
id[HVal] = id[Val]; id[Val] = ++i;
|
||||
id[HVal] = id[Val]; id[Val] = --i;
|
||||
next();
|
||||
if (tk == ',') next();
|
||||
}
|
||||
next();
|
||||
}
|
||||
*++e = ENT; *++e = i - loc;
|
||||
while (tk != '}') stmt();
|
||||
*++e = LEV;
|
||||
n = ast;
|
||||
*--n = ';'; while (tk != '}') { t = n; stmt(); *--n = (int)t; *--n = '{'; }
|
||||
*--n = -i; *--n = Enter;
|
||||
gen(n);
|
||||
id = sym; // unwind symbol table locals
|
||||
while (id[Tk]) {
|
||||
if (id[Class] == Loc) {
|
||||
|
|
@ -465,8 +518,8 @@ int main(int argc, char **argv)
|
|||
sp = (int *)((int)sp + poolsz);
|
||||
*--sp = EXIT; // call exit if main returns
|
||||
*--sp = PSH; t = sp;
|
||||
*--sp = argc;
|
||||
*--sp = (int)argv;
|
||||
*--sp = argc;
|
||||
*--sp = (int)t;
|
||||
|
||||
// run...
|
||||
|
|
@ -477,7 +530,7 @@ int main(int argc, char **argv)
|
|||
printf("%d> %.4s", cycle,
|
||||
&"LEA ,IMM ,JMP ,JSR ,BZ ,BNZ ,ENT ,ADJ ,LEV ,LI ,LC ,SI ,SC ,PSH ,"
|
||||
"OR ,XOR ,AND ,EQ ,NE ,LT ,GT ,LE ,GE ,SHL ,SHR ,ADD ,SUB ,MUL ,DIV ,MOD ,"
|
||||
"OPEN,READ,CLOS,PRTF,MALC,MSET,MCMP,EXIT,"[i * 5]);
|
||||
"OPEN,READ,CLOS,PRTF,MALC,MSET,MCMP,MCPY,MMAP,DSYM,QSRT,EXIT,"[i * 5]);
|
||||
if (i <= ADJ) printf(" %d\n", *pc); else printf("\n");
|
||||
}
|
||||
if (i == LEA) a = (int)(bp + *pc++); // load local address
|
||||
|
|
@ -512,13 +565,17 @@ int main(int argc, char **argv)
|
|||
else if (i == DIV) a = *sp++ / a;
|
||||
else if (i == MOD) a = *sp++ % a;
|
||||
|
||||
else if (i == OPEN) a = open((char *)sp[1], *sp);
|
||||
else if (i == READ) a = read(sp[2], (char *)sp[1], *sp);
|
||||
else if (i == OPEN) a = open((char *)*sp, sp[1]);
|
||||
else if (i == READ) a = read(*sp, (char *)sp[1], sp[2]);
|
||||
else if (i == CLOS) a = close(*sp);
|
||||
else if (i == PRTF) { t = sp + pc[1]; a = printf((char *)t[-1], t[-2], t[-3], t[-4], t[-5], t[-6]); }
|
||||
else if (i == PRTF) a = printf((char *)*sp, sp[1], sp[2], sp[3], sp[4], sp[5]);
|
||||
else if (i == MALC) a = (int)malloc(*sp);
|
||||
else if (i == MSET) a = (int)memset((char *)sp[2], sp[1], *sp);
|
||||
else if (i == MCMP) a = memcmp((char *)sp[2], (char *)sp[1], *sp);
|
||||
else if (i == MSET) a = (int)memset((char *)*sp, sp[1], sp[2]);
|
||||
else if (i == MCMP) a = memcmp((char *)*sp, (char *)sp[1], sp[2]);
|
||||
else if (i == MCPY) a = (int)memcpy((char *)*sp, (char *)sp[1], sp[2]);
|
||||
else if (i == MMAP) a = (int)mmap((char *)*sp, sp[1], sp[2], sp[3], sp[4], sp[5]);
|
||||
else if (i == DSYM) a = (int)dlsym((char *)*sp, (char *)sp[1]);
|
||||
else if (i == QSRT) qsort((char *)sp, sp[1], sp[2], (void *)sp[3]);
|
||||
else if (i == EXIT) { printf("exit(%d) cycle = %d\n", *sp, cycle); return *sp; }
|
||||
else { printf("unknown instruction = %d! cycle = %d\n", i, cycle); return -1; }
|
||||
}
|
||||
579
c5x86.c
Normal file
579
c5x86.c
Normal file
|
|
@ -0,0 +1,579 @@
|
|||
// c5x86.c - C in five functions (native x86 version)
|
||||
|
||||
// c4.c plus
|
||||
// abstract syntax tree creation
|
||||
// back-end code generator
|
||||
// parameters passed in correct order
|
||||
// various optimizations
|
||||
|
||||
// Written by Robert Swierczek
|
||||
|
||||
#include <unistd.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <memory.h>
|
||||
#include <fcntl.h>
|
||||
#ifdef _WIN32
|
||||
#include "w32.h"
|
||||
#else
|
||||
#include <sys/mman.h>
|
||||
#endif
|
||||
|
||||
char *p, *lp, // current position in source code
|
||||
*e, // current position in emitted code
|
||||
*data, // data/bss pointer
|
||||
*dsym; // external function lookup name
|
||||
|
||||
int *id, // currently parsed identifier
|
||||
*n, // current node in abstract syntax tree
|
||||
*sym, // symbol table (simple list of identifiers)
|
||||
tk, // current token
|
||||
ival, // current token value
|
||||
ty, // current expression type
|
||||
line, // current line number
|
||||
src; // print source and assembly flag
|
||||
|
||||
// tokens and classes (operators last and in precedence order)
|
||||
enum {
|
||||
Num = 128, Fun, Glo, Loc, Id, Load, Enter,
|
||||
Char, Else, Enum, If, Int, Return, Sizeof, While,
|
||||
Assign, Cond, Lor, Lan, Or, Xor, And, Eq, Ne, Lt, Gt, Le, Ge, Shl, Shr, Add, Sub, Mul, Div, Mod, Inc, Dec, Brak
|
||||
};
|
||||
|
||||
// types
|
||||
enum { CHAR, INT, PTR };
|
||||
|
||||
// identifier offsets (since we can't create an ident struct)
|
||||
enum { Tk, Hash, Name, Class, Type, Val, HClass, HType, HVal, Idsz };
|
||||
|
||||
void next()
|
||||
{
|
||||
char *pp;
|
||||
|
||||
while (tk = *p) {
|
||||
++p;
|
||||
if (tk == '\n') {
|
||||
if (src) {
|
||||
printf("%d: %.*s", line, p - lp, lp);
|
||||
lp = p;
|
||||
}
|
||||
++line;
|
||||
}
|
||||
else if (tk == '#') {
|
||||
while (*p != 0 && *p != '\n') ++p;
|
||||
}
|
||||
else if ((tk >= 'a' && tk <= 'z') || (tk >= 'A' && tk <= 'Z') || tk == '_') {
|
||||
pp = p - 1;
|
||||
while ((*p >= 'a' && *p <= 'z') || (*p >= 'A' && *p <= 'Z') || (*p >= '0' && *p <= '9') || *p == '_')
|
||||
tk = tk * 147 + *p++;
|
||||
tk = (tk << 6) + (p - pp);
|
||||
id = sym;
|
||||
while (id[Tk]) {
|
||||
if (tk == id[Hash] && !memcmp((char *)id[Name], pp, p - pp)) { tk = id[Tk]; return; }
|
||||
id = id + Idsz;
|
||||
}
|
||||
id[Name] = (int)pp;
|
||||
id[Hash] = tk;
|
||||
tk = id[Tk] = Id;
|
||||
return;
|
||||
}
|
||||
else if (tk >= '0' && tk <= '9') {
|
||||
if (ival = tk - '0') { while (*p >= '0' && *p <= '9') ival = ival * 10 + *p++ - '0'; }
|
||||
else if (*p == 'x' || *p == 'X') {
|
||||
while ((tk = *++p) && ((tk >= '0' && tk <= '9') || (tk >= 'a' && tk <= 'f') || (tk >= 'A' && tk <= 'F')))
|
||||
ival = ival * 16 + (tk & 15) + (tk >= 'A' ? 9 : 0);
|
||||
}
|
||||
else { while (*p >= '0' && *p <= '7') ival = ival * 8 + *p++ - '0'; }
|
||||
tk = Num;
|
||||
return;
|
||||
}
|
||||
else if (tk == '/') {
|
||||
if (*p == '/') {
|
||||
++p;
|
||||
while (*p != 0 && *p != '\n') ++p;
|
||||
}
|
||||
else {
|
||||
tk = Div;
|
||||
return;
|
||||
}
|
||||
}
|
||||
else if (tk == '\'' || tk == '"') {
|
||||
pp = data;
|
||||
while (*p != 0 && *p != tk) {
|
||||
if ((ival = *p++) == '\\') {
|
||||
if ((ival = *p++) == 'n') ival = '\n';
|
||||
}
|
||||
if (tk == '"') *data++ = ival;
|
||||
}
|
||||
++p;
|
||||
if (tk == '"') ival = (int)pp; else tk = Num;
|
||||
return;
|
||||
}
|
||||
else if (tk == '=') { if (*p == '=') { ++p; tk = Eq; } else tk = Assign; return; }
|
||||
else if (tk == '+') { if (*p == '+') { ++p; tk = Inc; } else tk = Add; return; }
|
||||
else if (tk == '-') { if (*p == '-') { ++p; tk = Dec; } else tk = Sub; return; }
|
||||
else if (tk == '!') { if (*p == '=') { ++p; tk = Ne; } return; }
|
||||
else if (tk == '<') { if (*p == '=') { ++p; tk = Le; } else if (*p == '<') { ++p; tk = Shl; } else tk = Lt; return; }
|
||||
else if (tk == '>') { if (*p == '=') { ++p; tk = Ge; } else if (*p == '>') { ++p; tk = Shr; } else tk = Gt; return; }
|
||||
else if (tk == '|') { if (*p == '|') { ++p; tk = Lor; } else tk = Or; return; }
|
||||
else if (tk == '&') { if (*p == '&') { ++p; tk = Lan; } else tk = And; return; }
|
||||
else if (tk == '^') { tk = Xor; return; }
|
||||
else if (tk == '%') { tk = Mod; return; }
|
||||
else if (tk == '*') { tk = Mul; return; }
|
||||
else if (tk == '[') { tk = Brak; return; }
|
||||
else if (tk == '?') { tk = Cond; return; }
|
||||
else if (tk == '~' || tk == ';' || tk == '{' || tk == '}' || tk == '(' || tk == ')' || tk == ']' || tk == ',' || tk == ':') return;
|
||||
}
|
||||
}
|
||||
|
||||
void expr(int lev)
|
||||
{
|
||||
int t, *d, *b;
|
||||
|
||||
if (!tk) { printf("%d: unexpected eof in expression\n", line); exit(-1); }
|
||||
else if (tk == Num) { *--n = ival; *--n = Num; next(); ty = INT; }
|
||||
else if (tk == '"') {
|
||||
*--n = ival; *--n = Num; next();
|
||||
while (tk == '"') next();
|
||||
data = (char *)((int)data + sizeof(int) & -sizeof(int)); ty = PTR;
|
||||
}
|
||||
else if (tk == Sizeof) {
|
||||
next(); if (tk == '(') next(); else { printf("%d: open paren expected in sizeof\n", line); exit(-1); }
|
||||
ty = INT; if (tk == Int) next(); else if (tk == Char) { next(); ty = CHAR; }
|
||||
while (tk == Mul) { next(); ty = ty + PTR; }
|
||||
if (tk == ')') next(); else { printf("%d: close paren expected in sizeof\n", line); exit(-1); }
|
||||
*--n = (ty == CHAR) ? sizeof(char) : sizeof(int); *--n = Num;
|
||||
ty = INT;
|
||||
}
|
||||
else if (tk == Id) {
|
||||
d = id; next();
|
||||
if (tk == '(') {
|
||||
if (!d[Class]) {
|
||||
memcpy(dsym, (char *)d[Name], d[Hash] & 63); dsym[d[Hash] & 63] = 0;
|
||||
if (d[Val] = (int)dlsym(0, dsym)) d[Class] = Fun;
|
||||
}
|
||||
if (d[Class] != Fun) { printf("%d: bad function call\n", line); exit(-1); }
|
||||
next();
|
||||
t = 0; b = 0;
|
||||
while (tk != ')') { expr(Assign); *--n = (int)b; b = n; ++t; if (tk == ',') next(); }
|
||||
next();
|
||||
*--n = t; *--n = d[Val]; *--n = (int)b; *--n = d[Class];
|
||||
ty = d[Type];
|
||||
}
|
||||
else if (d[Class] == Num) { *--n = d[Val]; *--n = Num; ty = INT; }
|
||||
else {
|
||||
if (d[Class] == Loc) { *--n = d[Val]; *--n = Loc; }
|
||||
else if (d[Class] == Glo) { *--n = d[Val]; *--n = Num; }
|
||||
else { printf("%d: undefined variable\n", line); exit(-1); }
|
||||
*--n = ty = d[Type]; *--n = Load;
|
||||
}
|
||||
}
|
||||
else if (tk == '(') {
|
||||
next();
|
||||
if (tk == Int || tk == Char) {
|
||||
t = (tk == Int) ? INT : CHAR; next();
|
||||
while (tk == Mul) { next(); t = t + PTR; }
|
||||
if (tk == ')') next(); else { printf("%d: bad cast\n", line); exit(-1); }
|
||||
expr(Inc);
|
||||
ty = t;
|
||||
}
|
||||
else {
|
||||
expr(Assign);
|
||||
if (tk == ')') next(); else { printf("%d: close paren expected\n", line); exit(-1); }
|
||||
}
|
||||
}
|
||||
else if (tk == Mul) {
|
||||
next(); expr(Inc);
|
||||
if (ty > INT) ty = ty - PTR; else { printf("%d: bad dereference\n", line); exit(-1); }
|
||||
*--n = ty; *--n = Load;
|
||||
}
|
||||
else if (tk == And) {
|
||||
next(); expr(Inc);
|
||||
if (*n == Load) n = n+2; else { printf("%d: bad address-of\n", line); exit(-1); }
|
||||
ty = ty + PTR;
|
||||
}
|
||||
else if (tk == '!') {
|
||||
next(); expr(Inc);
|
||||
if (*n == Num) n[1] = !n[1]; else { *--n = 0; *--n = Num; --n; *n = (int)(n+3); *--n = Eq; }
|
||||
ty = INT;
|
||||
}
|
||||
else if (tk == '~') {
|
||||
next(); expr(Inc);
|
||||
if (*n == Num) n[1] = ~n[1]; else { *--n = -1; *--n = Num; --n; *n = (int)(n+3); *--n = Xor; }
|
||||
ty = INT;
|
||||
}
|
||||
else if (tk == Add) { next(); expr(Inc); ty = INT; }
|
||||
else if (tk == Sub) {
|
||||
next(); expr(Inc);
|
||||
if (*n == Num) n[1] = -n[1]; else { *--n = -1; *--n = Num; --n; *n = (int)(n+3); *--n = Mul; }
|
||||
ty = INT;
|
||||
}
|
||||
else if (tk == Inc || tk == Dec) {
|
||||
t = tk; next(); expr(Inc);
|
||||
if (*n == Load) *n = t; else { printf("%d: bad lvalue in pre-increment\n", line); exit(-1); }
|
||||
}
|
||||
else { printf("%d: bad expression\n", line); exit(-1); }
|
||||
|
||||
while (tk >= lev) { // "precedence climbing" or "Top Down Operator Precedence" method
|
||||
t = ty; b = n;
|
||||
if (tk == Assign) {
|
||||
next();
|
||||
if (*n != Load) { printf("%d: bad lvalue in assignment\n", line); exit(-1); }
|
||||
expr(Assign); *--n = (int)(b+2); *--n = ty = t; *--n = Assign;
|
||||
}
|
||||
else if (tk == Cond) {
|
||||
next();
|
||||
expr(Assign);
|
||||
if (tk == ':') next(); else { printf("%d: conditional missing colon\n", line); exit(-1); }
|
||||
d = n;
|
||||
expr(Cond);
|
||||
--n; *n = (int)(n+1); *--n = (int)d; *--n = (int)b; *--n = Cond;
|
||||
}
|
||||
else if (tk == Lor) { next(); expr(Lan); if (*n==Num && *b==Num) n[1] = b[1] || n[1]; else { *--n = (int)b; *--n = Lor; } ty = INT; }
|
||||
else if (tk == Lan) { next(); expr(Or); if (*n==Num && *b==Num) n[1] = b[1] && n[1]; else { *--n = (int)b; *--n = Lan; } ty = INT; }
|
||||
else if (tk == Or) { next(); expr(Xor); if (*n==Num && *b==Num) n[1] = b[1] | n[1]; else { *--n = (int)b; *--n = Or; } ty = INT; }
|
||||
else if (tk == Xor) { next(); expr(And); if (*n==Num && *b==Num) n[1] = b[1] ^ n[1]; else { *--n = (int)b; *--n = Xor; } ty = INT; }
|
||||
else if (tk == And) { next(); expr(Eq); if (*n==Num && *b==Num) n[1] = b[1] & n[1]; else { *--n = (int)b; *--n = And; } ty = INT; }
|
||||
else if (tk == Eq) { next(); expr(Lt); if (*n==Num && *b==Num) n[1] = b[1] == n[1]; else { *--n = (int)b; *--n = Eq; } ty = INT; }
|
||||
else if (tk == Ne) { next(); expr(Lt); if (*n==Num && *b==Num) n[1] = b[1] != n[1]; else { *--n = (int)b; *--n = Ne; } ty = INT; }
|
||||
else if (tk == Lt) { next(); expr(Shl); if (*n==Num && *b==Num) n[1] = b[1] < n[1]; else { *--n = (int)b; *--n = Lt; } ty = INT; }
|
||||
else if (tk == Gt) { next(); expr(Shl); if (*n==Num && *b==Num) n[1] = b[1] > n[1]; else { *--n = (int)b; *--n = Gt; } ty = INT; }
|
||||
else if (tk == Le) { next(); expr(Shl); if (*n==Num && *b==Num) n[1] = b[1] <= n[1]; else { *--n = (int)b; *--n = Le; } ty = INT; }
|
||||
else if (tk == Ge) { next(); expr(Shl); if (*n==Num && *b==Num) n[1] = b[1] >= n[1]; else { *--n = (int)b; *--n = Ge; } ty = INT; }
|
||||
else if (tk == Shl) { next(); expr(Add); if (*n==Num && *b==Num) n[1] = b[1] << n[1]; else { *--n = (int)b; *--n = Shl; } ty = INT; }
|
||||
else if (tk == Shr) { next(); expr(Add); if (*n==Num && *b==Num) n[1] = b[1] >> n[1]; else { *--n = (int)b; *--n = Shr; } ty = INT; }
|
||||
else if (tk == Add) {
|
||||
next(); expr(Mul);
|
||||
if ((ty = t) > PTR) { if (*n == Num) n[1] = n[1] * sizeof(int); else { *--n = sizeof(int); *--n = Num; --n; *n = (int)(n+3); *--n = Mul; } }
|
||||
if (*n == Num && *b == Num) n[1] = b[1] + n[1]; else { *--n = (int)b; *--n = Add; }
|
||||
}
|
||||
else if (tk == Sub) {
|
||||
next(); expr(Mul);
|
||||
if ((ty = t) > PTR) { if (*n == Num) n[1] = n[1] * sizeof(int); else { *--n = sizeof(int); *--n = Num; --n; *n = (int)(n+3); *--n = Mul; } }
|
||||
if (*n == Num && *b == Num) n[1] = b[1] - n[1]; else { *--n = (int)b; *--n = Sub; }
|
||||
}
|
||||
else if (tk == Mul) { next(); expr(Inc); if (*n==Num && *b==Num) n[1] = b[1] * n[1]; else { *--n = (int)b; *--n = Mul; } ty = INT; }
|
||||
else if (tk == Div) { next(); expr(Inc); if (*n==Num && *b==Num) n[1] = b[1] / n[1]; else { *--n = (int)b; *--n = Div; } ty = INT; }
|
||||
else if (tk == Mod) { next(); expr(Inc); if (*n==Num && *b==Num) n[1] = b[1] % n[1]; else { *--n = (int)b; *--n = Mod; } ty = INT; }
|
||||
else if (tk == Inc || tk == Dec) {
|
||||
if (*n == Load) *n = tk; else { printf("%d: bad lvalue in post-increment\n", line); exit(-1); }
|
||||
*--n = (ty > PTR) ? sizeof(int) : sizeof(char); *--n = Num;
|
||||
*--n = (int)b; *--n = (tk == Inc) ? Sub : Add;
|
||||
next();
|
||||
}
|
||||
else if (tk == Brak) {
|
||||
next(); expr(Assign);
|
||||
if (tk == ']') next(); else { printf("%d: close bracket expected\n", line); exit(-1); }
|
||||
if (t > PTR) { if (*n == Num) n[1] = n[1] * sizeof(int); else { *--n = sizeof(int); *--n = Num; --n; *n = (int)(n+3); *--n = Mul; } }
|
||||
else if (t < PTR) { printf("%d: pointer type expected\n", line); exit(-1); }
|
||||
if (*n == Num && *b == Num) n[1] = b[1] + n[1]; else { *--n = (int)b; *--n = Add; }
|
||||
*--n = ty = t - PTR; *--n = Load;
|
||||
}
|
||||
else { printf("%d: compiler error tk=%d\n", line, tk); exit(-1); }
|
||||
}
|
||||
}
|
||||
|
||||
void stmt()
|
||||
{
|
||||
int *a, *b, *c;
|
||||
|
||||
if (tk == If) {
|
||||
next();
|
||||
if (tk == '(') next(); else { printf("%d: open paren expected\n", line); exit(-1); }
|
||||
expr(Assign); a = n;
|
||||
if (tk == ')') next(); else { printf("%d: close paren expected\n", line); exit(-1); }
|
||||
stmt(); b = n;
|
||||
if (tk == Else) { next(); stmt(); c = n; } else c = 0;
|
||||
*--n = (int)c; *--n = (int)b; *--n = (int)a; *--n = Cond;
|
||||
}
|
||||
else if (tk == While) {
|
||||
next();
|
||||
if (tk == '(') next(); else { printf("%d: open paren expected\n", line); exit(-1); }
|
||||
expr(Assign); a = n;
|
||||
if (tk == ')') next(); else { printf("%d: close paren expected\n", line); exit(-1); }
|
||||
stmt();
|
||||
*--n = (int)a; *--n = While;
|
||||
}
|
||||
else if (tk == Return) {
|
||||
next();
|
||||
if (tk != ';') { expr(Assign); a = n; } else a = 0;
|
||||
if (tk == ';') next(); else { printf("%d: semicolon expected\n", line); exit(-1); }
|
||||
*--n = (int)a; *--n = Return;
|
||||
}
|
||||
else if (tk == '{') {
|
||||
next();
|
||||
*--n = ';';
|
||||
while (tk != '}') { a = n; stmt(); *--n = (int)a; *--n = '{'; }
|
||||
next();
|
||||
}
|
||||
else if (tk == ';') {
|
||||
next(); *--n = ';';
|
||||
}
|
||||
else {
|
||||
expr(Assign);
|
||||
if (tk == ';') next(); else { printf("%d: semicolon expected\n", line); exit(-1); }
|
||||
}
|
||||
}
|
||||
|
||||
void gen(int *n)
|
||||
{
|
||||
int i; char *b;
|
||||
|
||||
i = *n;
|
||||
if (i == Num) {
|
||||
*e++ = 0xb8; *(int *)e = n[1]; e = e+4; if (src) printf(" movl $%d, %%eax\n",n[1]);
|
||||
}
|
||||
else if (i == Loc) {
|
||||
if (n[1] < -32 || n[1] > 32) { printf("%d: gen(lea) out of bounds\n", line); exit(-1); }
|
||||
*(int *)e = 0x458d + (n[1] << 18); e = e+3; if (src) printf(" leal $%d(%%ebp), %%eax\n", n[1]*4);
|
||||
}
|
||||
else if (i == Load) {
|
||||
gen(n+2);
|
||||
if (n[1] == CHAR) { *(int *)e = 0x00be0f; e = e+3; if (src) printf(" movsbl (%%eax), %%eax\n"); }
|
||||
else { *(int *)e = 0x008b; e = e+2; if (src) printf(" movl (%%eax), %%eax\n"); }
|
||||
}
|
||||
else if (i == Assign) {
|
||||
gen((int *)n[2]); *e++ = 0x50; if (src) printf(" push %%eax\n");
|
||||
gen(n+3); *e++ = 0x59; if (src) printf(" pop %%ecx\n");
|
||||
if (n[1] == CHAR) { *(int *)e = 0x0188; e = e+2; if (src) printf(" movb %%al, (%%ecx)\n"); }
|
||||
else { *(int *)e = 0x0189; e = e+2; if (src) printf(" movl %%eax, (%%ecx)\n"); }
|
||||
}
|
||||
else if (i == Inc || i == Dec) {
|
||||
gen(n+2); *e++ = 0x50; if (src) printf(" push %%eax\n");
|
||||
if (n[1] == CHAR) { *(int *)e = 0x00be0f; e = e+3; if (src) printf(" movsbl (%%eax), %%eax\n"); }
|
||||
else { *(int *)e = 0x008b; e = e+2; if (src) printf(" movl (%%eax), %%eax\n"); }
|
||||
i = ((i == Inc) ? 1 : -1) * ((n[1] > PTR) ? sizeof(int) : sizeof(char));
|
||||
*e++ = 0xb9; *(int *)e = i; e = e+4; if (src) printf(" movl $%d, %%ecx\n", i);
|
||||
*(int *)e = 0xc801; e = e+2; if (src) printf(" addl %%ecx, %%eax\n");
|
||||
*e++ = 0x59; if (src) printf(" pop %%ecx\n");
|
||||
if (n[1] == CHAR) { *(int *)e = 0x0188; e = e+2; if (src) printf(" movb %%al, (%%ecx)\n"); }
|
||||
else { *(int *)e = 0x0189; e = e+2; if (src) printf(" movl %%eax, (%%ecx)\n"); }
|
||||
}
|
||||
else if (i == Cond) {
|
||||
gen((int *)n[1]);
|
||||
*(int *)e = 0x840fc085; e = e+4; b = e; e = e+4; if (src) printf(" test %%eax, %%eax\n jeq <fwd>\n");
|
||||
gen((int *)n[2]);
|
||||
if (n[3]) {
|
||||
*(int *)b = e+5 - b - 4;
|
||||
*e++ = 0xe9; b = e; e = e + 4; if (src) printf(" jmp <fwd>\n");
|
||||
gen((int *)n[3]);
|
||||
}
|
||||
*(int *)b = e - b - 4;
|
||||
}
|
||||
else if (i == Lor) {
|
||||
gen((int *)n[1]);
|
||||
*(int *)e = 0x850fc085; e = e+4; b = e; e = e+4; if (src) printf(" test %%eax, %%eax\n jne <fwd>\n");
|
||||
gen(n+2);
|
||||
*(int *)b = e - b - 4;
|
||||
}
|
||||
else if (i == Lan) {
|
||||
gen((int *)n[1]);
|
||||
*(int *)e = 0x840fc085; e = e+4; b = e; e = e+4; if (src) printf(" test %%eax, %%eax\n jeq <fwd>\n");
|
||||
gen(n+2);
|
||||
*(int *)b = e - b - 4;
|
||||
}
|
||||
else if (i >= Or && i <= Mod) {
|
||||
gen(n+2); *e++ = 0x50; if (src) printf(" push %%eax\n");
|
||||
gen((int *)n[1]); *e++ = 0x59; if (src) printf(" pop %%ecx\n");
|
||||
if (i == Or) { *(int *)e = 0xc809; e = e+2; if (src) printf(" orl %%ecx, %%eax\n"); }
|
||||
else if (i == Xor) { *(int *)e = 0xc831; e = e+2; if (src) printf(" xorl %%ecx, %%eax\n"); }
|
||||
else if (i == And) { *(int *)e = 0xc821; e = e+2; if (src) printf(" andl %%ecx, %%eax\n"); }
|
||||
else if (i >= Eq && i <= Ge) {
|
||||
*(int *)e = 0xc839; e = e+2; if (src) printf(" cmp %%eax, %%ecx\n");
|
||||
*e++ = 0xb8; *(int *)e = 0; e = e+4; if (src) printf(" mov $0, %%eax\n");
|
||||
if (i == Eq) { *(int *)e = 0xc0940f; if (src) printf(" sete %%al\n"); }
|
||||
else if (i == Ne) { *(int *)e = 0xc0950f; if (src) printf(" setne %%al\n"); }
|
||||
else if (i == Lt) { *(int *)e = 0xc09c0f; if (src) printf(" setl %%al\n"); }
|
||||
else if (i == Gt) { *(int *)e = 0xc09f0f; if (src) printf(" setg %%al\n"); }
|
||||
else if (i == Le) { *(int *)e = 0xc09e0f; if (src) printf(" setle %%al\n"); }
|
||||
else { *(int *)e = 0xc09d0f; if (src) printf(" setge %%al\n"); }
|
||||
e = e+3;
|
||||
}
|
||||
else if (i == Shl) { *(int *)e = 0xe0d3; e = e+2; if (src) printf(" shl %%cl, %%eax\n"); }
|
||||
else if (i == Shr) { *(int *)e = 0xf8d3; e = e+2; if (src) printf(" sar %%cl, %%eax\n"); }
|
||||
else if (i == Add) { *(int *)e = 0xc801; e = e+2; if (src) printf(" addl %%ecx, %%eax\n"); }
|
||||
else if (i == Sub) { *(int *)e = 0xc829; e = e+2; if (src) printf(" subl %%ecx, %%eax\n"); }
|
||||
else if (i == Mul) { *(int *)e = 0xc1af0f; e = e+3; if (src) printf(" imul %%ecx, %%eax\n"); }
|
||||
else if (i == Div) { *(int *)e = 0xf9f799; e = e+3; if (src) printf(" cltd\n idiv %%ecx, %%eax\n"); }
|
||||
else if (i == Mod) { *(int *)e = 0x92f9f799; e=e+4; if (src) printf(" cltd\n idiv %%ecx, %%eax\n xchg %%edx, %%eax\n"); }
|
||||
}
|
||||
else if (i == Fun) {
|
||||
i = n[1];
|
||||
while (i) {
|
||||
gen(((int *)i)+1); *e++ = 0x50; i = *(int *)i; if (src) printf(" push %%eax\n");
|
||||
}
|
||||
*e++ = 0xe8; *(int *)e = n[2]-(int)e-4; e = e+4; if (src) printf(" call <off32>\n");
|
||||
if (n[3]) {
|
||||
*(int *)e = 0xc481; e = e+2;
|
||||
*(int *)e = n[3]*4; e = e+4; if (src) printf(" add $%d, %%esp\n", n[3]*4);
|
||||
}
|
||||
}
|
||||
else if (i == While) {
|
||||
*e++ = 0xe9; b = e; e = e+4; if (src) printf(" jmp <fwd>\n");
|
||||
gen(n+2);
|
||||
*(int *)b = e - b - 4;
|
||||
gen((int *)n[1]);
|
||||
*(int *)e = 0x850fc085; e = e+4; if (src) printf(" test %%eax, %%eax\n");
|
||||
*(int *)e = b - e; e = e+4; if (src) printf(" jne $%d\n", b - e);
|
||||
}
|
||||
else if (i == Return) {
|
||||
if (n[1]) gen((int *)n[1]); if (src) printf(" mov %%ebp, %%esp\n");
|
||||
*(int *)e = 0xc35dec89; e = e+4; if (src) printf(" pop %%ebp\n ret\n");
|
||||
}
|
||||
else if (i == '{') {
|
||||
gen((int *)n[1]); gen(n+2);
|
||||
}
|
||||
else if (i == Enter) {
|
||||
*(int *)e = 0xe58955; e = e+3; if (src) printf(" push %%ebp;\n mov %%esp, %%ebp\n");
|
||||
if (n[1]) {
|
||||
*(int *)e = 0xec81; e = e+2;
|
||||
*(int *)e = n[1]*4; e = e+4; if (src) printf(" subl $%d, %%esp\n", n[1]*4);
|
||||
}
|
||||
gen(n+2); if (src) printf(" mov %%ebp, %%esp\n");
|
||||
*(int *)e = 0xc35dec89; e = e+4; if (src) printf(" pop %%ebp\n ret\n");
|
||||
}
|
||||
else if (i != ';') { printf("%d: compiler error gen=%d\n", line, i); exit(-1); }
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
int fd, bt, ty, poolsz, *idmain, *ast;
|
||||
int i, *t; // temps
|
||||
|
||||
--argc; ++argv;
|
||||
if (argc > 0 && **argv == '-' && (*argv)[1] == 's') { src = 1; --argc; ++argv; }
|
||||
if (argc < 1) { printf("usage: c5x86 [-s] file ...\n"); return -1; }
|
||||
|
||||
if ((fd = open(*argv, 0)) < 0) { printf("could not open(%s)\n", *argv); return -1; }
|
||||
|
||||
poolsz = 256*1024; // arbitrary size
|
||||
if (!(sym = malloc(poolsz))) { printf("could not malloc(%d) symbol area\n", poolsz); return -1; }
|
||||
if (!(data = malloc(poolsz))) { printf("could not malloc(%d) data area\n", poolsz); return -1; }
|
||||
if (!(dsym = malloc(64))) { printf("could not malloc(64) dsym\n"); return -1; }
|
||||
if (!(ast = malloc(poolsz))) { printf("could not malloc(%d) abstract syntax tree area\n", poolsz); return -1; }
|
||||
ast = (int *)((int)ast + poolsz); // abstract syntax tree is most efficiently built as a stack
|
||||
|
||||
memset(sym, 0, poolsz);
|
||||
memset(data, 0, poolsz);
|
||||
|
||||
if (!(e = mmap(0, poolsz, 7, 0x22, -1, 0))) { printf("could not mmap() executable memory\n"); return -1; }
|
||||
|
||||
p = "char else enum if int return sizeof while void main";
|
||||
i = Char; while (i <= While) { next(); id[Tk] = i++; } // add keywords to symbol table
|
||||
next(); id[Tk] = Char; // handle void type
|
||||
next(); idmain = id; // keep track of main
|
||||
|
||||
if (!(lp = p = malloc(poolsz))) { printf("could not malloc(%d) source area\n", poolsz); return -1; }
|
||||
if ((i = read(fd, p, poolsz-1)) <= 0) { printf("read() returned %d\n", i); return -1; }
|
||||
p[i] = 0;
|
||||
close(fd);
|
||||
|
||||
// parse declarations
|
||||
line = 1;
|
||||
next();
|
||||
while (tk) {
|
||||
bt = INT; // basetype
|
||||
if (tk == Int) next();
|
||||
else if (tk == Char) { next(); bt = CHAR; }
|
||||
else if (tk == Enum) {
|
||||
next();
|
||||
if (tk != '{') next();
|
||||
if (tk == '{') {
|
||||
next();
|
||||
i = 0;
|
||||
while (tk != '}') {
|
||||
if (tk != Id) { printf("%d: bad enum identifier %d\n", line, tk); return -1; }
|
||||
next();
|
||||
if (tk == Assign) {
|
||||
next();
|
||||
n = ast; expr(Cond);
|
||||
if (*n != Num) { printf("%d: bad enum initializer\n", line); return -1; }
|
||||
i = n[1];
|
||||
}
|
||||
id[Class] = Num; id[Type] = INT; id[Val] = i++;
|
||||
if (tk == ',') next();
|
||||
}
|
||||
next();
|
||||
}
|
||||
}
|
||||
while (tk != ';' && tk != '}') {
|
||||
ty = bt;
|
||||
while (tk == Mul) { next(); ty = ty + PTR; }
|
||||
if (tk != Id) { printf("%d: bad global declaration\n", line); return -1; }
|
||||
if (id[Class]) { printf("%d: duplicate global definition\n", line); return -1; }
|
||||
next();
|
||||
id[Type] = ty;
|
||||
if (tk == '(') { // function
|
||||
id[Class] = Fun;
|
||||
id[Val] = (int)e;
|
||||
next(); i = 2;
|
||||
while (tk != ')') {
|
||||
ty = INT;
|
||||
if (tk == Int) next();
|
||||
else if (tk == Char) { next(); ty = CHAR; }
|
||||
while (tk == Mul) { next(); ty = ty + PTR; }
|
||||
if (tk != Id) { printf("%d: bad parameter declaration\n", line); return -1; }
|
||||
if (id[Class] == Loc) { printf("%d: duplicate parameter definition\n", line); return -1; }
|
||||
id[HClass] = id[Class]; id[Class] = Loc;
|
||||
id[HType] = id[Type]; id[Type] = ty;
|
||||
id[HVal] = id[Val]; id[Val] = i++;
|
||||
next();
|
||||
if (tk == ',') next();
|
||||
}
|
||||
next();
|
||||
if (tk != '{') { printf("%d: bad function definition\n", line); return -1; }
|
||||
i = 0;
|
||||
next();
|
||||
while (tk == Int || tk == Char) {
|
||||
bt = (tk == Int) ? INT : CHAR;
|
||||
next();
|
||||
while (tk != ';') {
|
||||
ty = bt;
|
||||
while (tk == Mul) { next(); ty = ty + PTR; }
|
||||
if (tk != Id) { printf("%d: bad local declaration\n", line); return -1; }
|
||||
if (id[Class] == Loc) { printf("%d: duplicate local definition\n", line); return -1; }
|
||||
id[HClass] = id[Class]; id[Class] = Loc;
|
||||
id[HType] = id[Type]; id[Type] = ty;
|
||||
id[HVal] = id[Val]; id[Val] = --i;
|
||||
next();
|
||||
if (tk == ',') next();
|
||||
}
|
||||
next();
|
||||
}
|
||||
n = ast;
|
||||
*--n = ';'; while (tk != '}') { t = n; stmt(); *--n = (int)t; *--n = '{'; }
|
||||
*--n = -i; *--n = Enter;
|
||||
gen(n);
|
||||
id = sym; // unwind symbol table locals
|
||||
while (id[Tk]) {
|
||||
if (id[Class] == Loc) {
|
||||
id[Class] = id[HClass];
|
||||
id[Type] = id[HType];
|
||||
id[Val] = id[HVal];
|
||||
}
|
||||
id = id + Idsz;
|
||||
}
|
||||
}
|
||||
else {
|
||||
id[Class] = Glo;
|
||||
id[Val] = (int)data;
|
||||
data = data + sizeof(int);
|
||||
}
|
||||
if (tk == ',') next();
|
||||
}
|
||||
next();
|
||||
}
|
||||
|
||||
if (!idmain[Val]) { printf("main() not defined\n"); return -1; }
|
||||
if (!src) {
|
||||
t = (int *)e;
|
||||
*e++ = 0xb8; *(char ***)e = argv; e = e+4; *e++ = 0x50; // movl $argv, %eax; push %eax
|
||||
*e++ = 0xb8; *(int *) e = argc; e = e+4; *e++ = 0x50; // movl $argc, %eax; push %eax
|
||||
*e++ = 0xe8; *(int *)e = idmain[Val] - (int)e - 4; e = e+4; // call main
|
||||
*e++ = 0x81; *e++ = 0xc4; *(int *)e = 8; e = e+4; // add $8, %esp
|
||||
*e++ = 0xc3; // ret
|
||||
qsort(dsym, 2, 1, (void *)t); // hack to call a function pointer
|
||||
printf("exit(0) from c5x86\n");
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
32
w32.h
Normal file
32
w32.h
Normal file
|
|
@ -0,0 +1,32 @@
|
|||
#include <windows.h>
|
||||
void *mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off)
|
||||
{
|
||||
HANDLE fm, h;
|
||||
void *map;
|
||||
const off_t maxSize = off + (off_t)len;
|
||||
|
||||
h = (HANDLE)_get_osfhandle(fildes);
|
||||
fm = CreateFileMapping(h, NULL, PAGE_EXECUTE_READWRITE, 0, maxSize, NULL);
|
||||
map = MapViewOfFile(fm, FILE_MAP_READ | FILE_MAP_WRITE | FILE_MAP_EXECUTE, 0, off, len);
|
||||
CloseHandle(fm);
|
||||
return map;
|
||||
}
|
||||
|
||||
void *dlsym(void *handle, char *name)
|
||||
{
|
||||
if (!strcmp(name, "open" )) return &open;
|
||||
if (!strcmp(name, "read" )) return &read;
|
||||
if (!strcmp(name, "close" )) return &close;
|
||||
if (!strcmp(name, "printf")) return &printf;
|
||||
if (!strcmp(name, "malloc")) return &malloc;
|
||||
if (!strcmp(name, "memset")) return &memset;
|
||||
if (!strcmp(name, "memcmp")) return &memcmp;
|
||||
if (!strcmp(name, "memcpy")) return &memcpy;
|
||||
if (!strcmp(name, "mmap" )) return &mmap;
|
||||
if (!strcmp(name, "dlsym" )) return &dlsym;
|
||||
if (!strcmp(name, "qsort" )) return &qsort;
|
||||
if (!strcmp(name, "exit" )) return &exit;
|
||||
return 0;
|
||||
}
|
||||
#define CHAR TYCHAR
|
||||
#define INT TYINT
|
||||
Loading…
Reference in a new issue