commit da8a014ccd89acf7d31ea34af8016de61126a446
parent 1c93045ca831a57e47da5ed0c513b1fc987de308
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date: Mon, 24 Aug 2015 20:50:55 +0200
Merge remote-tracking branch 'origin/master'
Diffstat:
| M | cc1/ir.md | | | 59 | +++++++++++++++++++++++++++++++---------------------------- |
1 file changed, 31 insertions(+), 28 deletions(-)
diff --git a/cc1/ir.md b/cc1/ir.md
@@ -18,12 +18,12 @@ Types are represented using upper case letters:
* C -- char
* I -- int
* W -- long
-* Q -- long long
+* O -- long long
* M -- unsigned char
* N -- unsigned int
* Z -- unsigned long
* Q -- unsigned long long
-* O -- void
+* 0 -- void
* P -- pointer
* F -- function
* V -- vector
@@ -31,8 +31,8 @@ Types are represented using upper case letters:
* S -- struct
* B -- bool
* J -- float
-* D -- Double
-* H -- double
+* D -- double
+* H -- long double
This list is built for the original Z80 backend, where 'int'
had the same size than 'short'. Several types need an identifier
@@ -99,14 +99,15 @@ will generate a type declaration and a variable declaration:
> X6 F3 printf
After the type specification of the function (F and an identifier),
-is described the type of all the parameters of the function.
+the types of the function parameters are described.
A '{' in the first column begins the body for the previously
declared function: For example:
-> int printf(char *p) {}
+> int printf(char *cmd) {}
will generate
+> F3 P
> G6 F3 printf
> {
> A7 P cmd
@@ -117,10 +118,11 @@ Again, the front end must ensure that '{' appears only after the
declaration of a function. The character '-' marks the separation
between parameters and local variables:
-> int printf(register char *p) {int i;};
+> int printf(register char *cmd) {int i;};
will generate
+> F3 P
> G6 F3 printf
> {
> R7 P cmd
@@ -181,7 +183,15 @@ Assignation has some suboperators:
* ;+ -- post increment
* ;- -- post decrement
-Every operator in an expression has a type descriptor. Example:
+Every operator in an expression has a type descriptor.
+
+#### Constants ####
+
+Constants are introduced by the character '#'. For example 10 is
+translated to #IA (all the constants are emitted in hexadecimal),
+where I indicates that is an integer constant. Strings represent
+a special case because they are represented with the " character.
+The constant "hello" is emiited as "68656C6C6F. Example:
> int
> main(void)
@@ -205,14 +215,6 @@ A special case of expressions are casts, which are indicated using
two type descriptors together. For example a cast from char to int
is indicated with CI.
-#### Constants ####
-
-constants are introduced by the character '#'. For example 10 is
-translated to #IA (all the constant are emitted in hexadecimal),
-where I indicates that is an integer constant. Strings represent
-a special case because they are represented with the " character.
-The constant "hello" is emiited as "68656C6C6F,
-
### Statements ###
#### Jumps #####
@@ -222,13 +224,13 @@ Jumps have the next form:
the optional expression field indicates some condition which
must be satisfied to jump. Example:
->
+
> int
> main(void)
> {
> int i;
> goto label;
-> label: i -= i;;
+> label: i -= i;
> }
generates:
@@ -244,7 +246,8 @@ generates:
> }
Another form of jump is the return statement, which uses the
-letter 'y' and an optional expression. For example:
+letter 'y' with a return type and an optional expression.
+For example:
> int
> main(void)
@@ -273,11 +276,11 @@ of a loop:
#### Switch statement ####
-Switches are represented using a table, where it is indicated
-the label where jump for every case. Common cases are represented
-by 'v', meanwhile default is represented by 'f'. The switch
-statement itself is represented is represented by 's' followed
-by the label where the jump table is located and the expression
+Switches are represented using a table, in which the labels
+where to jump for each case are indicated. Common cases are
+represented by 'v', meanwhile default is represented by 'f'.
+The switch statement itself is represented by 's' followed by
+the label where the jump table is located, and the expression
of the switch. For example:
> int
@@ -325,12 +328,12 @@ switch.
* C -- char
* I -- int
* W -- long
-* Q -- long long
+* O -- long long
* M -- unsigned char
* N -- unsigned int
* Z -- unsigned long
* Q -- unsigned long long
-* O -- void
+* 0 -- void
* P -- pointer
* F -- function
* V -- vector
@@ -338,8 +341,8 @@ switch.
* S -- struct
* B -- bool
* J -- float
-* D -- Double
-* H -- double
+* D -- double
+* H -- long double
* A -- automatic
* R -- register
* G -- public (global variable declared in the module)
