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Make some expression tree operations more generic.

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This commit is contained in:
Olaf Seibert
2021-11-14 14:56:51 +01:00
parent 6a3642e49a
commit 2aa43f17f7
3 changed files with 113 additions and 90 deletions
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22
extree.h
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@@ -8,7 +8,8 @@ typedef struct ex_tree {
enum ex_type { EX_LIT = 1,
/* Expression is a literal value */
EX_SYM = 2,
/* Expression has a symbol reference */
/* Expression has a symbol reference
* (symbol from symbol table, so not freed) */
EX_UNDEFINED_SYM = 3,
/* Expression is undefined sym reference */
EX_TEMP_SYM = 4,
@@ -18,22 +19,22 @@ typedef struct ex_tree {
/* One's complement */
EX_NEG = 6,
/* Negate */
EX_ERR = 7,
EX_ERR = 8,
/* Expression with an error */
EX_ADD = 8,
EX_ADD = 9,
/* Add */
EX_SUB = 9,
EX_SUB = 10,
/* Subtract */
EX_MUL = 10,
EX_MUL = 11,
/* Multiply */
EX_DIV = 11,
EX_DIV = 12,
/* Divide */
EX_AND = 12,
EX_AND = 13,
/* bitwise and */
EX_OR = 13,
EX_OR = 14,
/* bitwise or */
EX_LSH = 14
EX_LSH = 15,
/* left shift */
} type;
@@ -67,7 +68,8 @@ EX_TREE *new_ex_bin(
EX_TREE *new_ex_una(
int type,
EX_TREE *left);
int num_subtrees(
EX_TREE *tp);
EX_TREE *evaluate(
EX_TREE *tp,
int flags);