diff options
| -rw-r--r-- | README.md | 8 | ||||
| -rw-r--r-- | main.c | 10 |
2 files changed, 9 insertions, 9 deletions
@@ -1,8 +1,8 @@ # P4Dcc -P4Dcc is a tiny, but self-hosted C compiler. It takes C source code and compiles it to assembly language. For assembling and linking, I use gcc as-is. +P4Dcc is a tiny, but self-hosted C compiler. It takes C source code and compiles it to assembly language. For assembling and linking, it deletegates to gcc as-is. -This project was started to test the hypothesis: "Could a self-hostable C compiler be built in four days, if the feature set is carefully limited?" - "P4D" stands for the ISO 8601 notation meaning "four days." However, I actually completed the project by the morning of the third day. +This project was started to prove the hypothesis: "Could a self-hostable C compiler be built in four days, if the feature set is carefully limited?" - "P4D" stands for the ISO 8601 notation meaning "four days." However, I actually completed the project by the morning of the third day. The code is written following the instructions at https://www.sigbus.info/compilerbook, and several key design decisions were inspired by the book. @@ -32,7 +32,7 @@ $ just test-all # test all things, including binary equiality between generatio To meet the four-day goal, many design decisions were made to reduce complexity (ideas directly taken from https://www.sigbus.info/compilerbook are not listed): -* Simplify declaration syntax +* Simplified declaration syntax * No support for `typedef` * Structs always begin with `struct` keyword * No support for array types @@ -40,7 +40,7 @@ To meet the four-day goal, many design decisions were made to reduce complexity * All arrays are heap-allocated and accessed via pointers * No support for function types * Type information always precede the variable name -* Most syntax sugar is not implemented +* Minimal syntax sugar * No increment/decrement operators * ~~No compound assignment operators~~ * Implemented after self-hosting @@ -412,7 +412,7 @@ int type_alignof(struct Type* ty) { #define AST_VAR_DECL 25 #define node_items __n1 -#define node_len ival +#define node_len __i #define node_expr __n1 #define node_lhs __n1 #define node_rhs __n2 @@ -426,19 +426,19 @@ int type_alignof(struct Type* ty) { #define node_members __n1 #define node_params __n1 #define node_args __n1 -#define node_int_value ival -#define node_index ival -#define node_op ival +#define node_int_value __i +#define node_index __i +#define node_op __i struct AstNode { int kind; char* name; - int ival; struct Type* ty; struct AstNode* __n1; struct AstNode* __n2; struct AstNode* __n3; struct AstNode* __n4; + int __i; }; struct Program { |