aboutsummaryrefslogtreecommitdiff
path: root/lparser.h
diff options
context:
space:
mode:
authorRoberto Ierusalimschy <roberto@inf.puc-rio.br>2015-12-17 13:44:50 -0200
committerRoberto Ierusalimschy <roberto@inf.puc-rio.br>2015-12-17 13:44:50 -0200
commit19770b03a9faa8e2e0bf573a9417db5bfba1eac9 (patch)
tree1c2b2e499441b97e5f8dea0cdc359ecd346b4b14 /lparser.h
parenta01eba657e3146f85b516a1c05c2009c626483cc (diff)
downloadlua-19770b03a9faa8e2e0bf573a9417db5bfba1eac9.tar.gz
lua-19770b03a9faa8e2e0bf573a9417db5bfba1eac9.tar.bz2
lua-19770b03a9faa8e2e0bf573a9417db5bfba1eac9.zip
comments. (More explanation about kinds of expressions.)
Diffstat (limited to 'lparser.h')
-rw-r--r--lparser.h44
1 files changed, 27 insertions, 17 deletions
diff --git a/lparser.h b/lparser.h
index e38ad7e5..1e15a92b 100644
--- a/lparser.h
+++ b/lparser.h
@@ -1,5 +1,5 @@
1/* 1/*
2** $Id: lparser.h,v 1.73 2014/06/19 18:27:20 roberto Exp roberto $ 2** $Id: lparser.h,v 1.74 2014/10/25 11:50:46 roberto Exp roberto $
3** Lua Parser 3** Lua Parser
4** See Copyright Notice in lua.h 4** See Copyright Notice in lua.h
5*/ 5*/
@@ -13,25 +13,35 @@
13 13
14 14
15/* 15/*
16** Expression descriptor 16** Expression descriptor.
17** Code generation for expressions can be delayed to allow
18** optimizations; An 'expdesc' structure describes a
19** potentially-delayed expression.
17*/ 20*/
18 21
22/* kinds of expressions */
19typedef enum { 23typedef enum {
20 VVOID, /* no value */ 24 VVOID, /* expression has no value */
21 VNIL, 25 VNIL, /* constant nil */
22 VTRUE, 26 VTRUE, /* constant true */
23 VFALSE, 27 VFALSE, /* constant false */
24 VK, /* info = index of constant in 'k' */ 28 VK, /* constant in 'k'; info = index of constant in 'k' */
25 VKFLT, /* nval = numerical float value */ 29 VKFLT, /* floating constant; nval = numerical float value */
26 VKINT, /* nval = numerical integer value */ 30 VKINT, /* integer constant; nval = numerical integer value */
27 VNONRELOC, /* info = result register */ 31 VNONRELOC, /* expression has its value in a fixed register;
28 VLOCAL, /* info = local register */ 32 info = result register */
29 VUPVAL, /* info = index of upvalue in 'upvalues' */ 33 VLOCAL, /* local variable; info = local register */
30 VINDEXED, /* t = table register/upvalue; idx = index R/K */ 34 VUPVAL, /* upvalue; info = index of upvalue in 'upvalues' */
31 VJMP, /* info = instruction pc */ 35 VINDEXED, /* indexed expression;
32 VRELOCABLE, /* info = instruction pc */ 36 ind.vt = whether 't' is register or upvalue;
33 VCALL, /* info = instruction pc */ 37 ind.t = table register or upvalue;
34 VVARARG /* info = instruction pc */ 38 ind.idx = index as R/K */
39 VJMP, /* expression is a test/comparison;
40 info = pc of corresponding jump instruction */
41 VRELOCABLE, /* expression can put result in any register;
42 info = instruction pc */
43 VCALL, /* expression is a function call; info = instruction pc */
44 VVARARG /* vararg expression; info = instruction pc */
35} expkind; 45} expkind;
36 46
37 47