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Add a comment about fake statement numbers.

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I had forgotten how they worked (not surprising after 6 years).
This commit is contained in:
Bill Currie 2018-08-21 15:57:51 +09:00
parent 1b84ea747c
commit 0f279cd3f0
1 changed files with 11 additions and 0 deletions
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11
tools/qfcc/source/flow.c
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@ -377,6 +377,17 @@ flow_build_vars (function_t *func)
set_add (func->global_vars, i); set_add (func->global_vars, i);
} }
// create dummy defs for local vars // create dummy defs for local vars
// defined local vars add their address in local space to the number of
// statements in the function:
// ([num_statements ... num_statements+localsize])
// with a set element for each def used in the local space
//
// temporary vars add their var number to the size of the local space
// before adding the number of statements in the function:
// ([num_statements+localsize ... num_vars])
// temporary vars are always accessed as a full var, so only one set
// element per temporary var is needed. This can lead to holes in the
// temporary var set element space, but it does keep things simple
for (i = 0; i < func->num_vars; i++) { for (i = 0; i < func->num_vars; i++) {
int offset, size; int offset, size;
int j; int j;